/*
 * Tiny Code Generator for QEMU
 *
 * Copyright (c) 2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/* define it to use liveness analysis (better code) */
#define USE_TCG_OPTIMIZATIONS

#include "qemu/osdep.h"

/* Define to jump the ELF file used to communicate with GDB.  */
#undef DEBUG_JIT

#include "qemu/error-report.h"
#include "qemu/cutils.h"
#include "qemu/host-utils.h"
#include "qemu/qemu-print.h"
#include "qemu/timer.h"
#include "qemu/cacheflush.h"
#include "qemu/cacheinfo.h"

/* Note: the long term plan is to reduce the dependencies on the QEMU
   CPU definitions. Currently they are used for qemu_ld/st
   instructions */
#define NO_CPU_IO_DEFS

#include "exec/exec-all.h"
#include "tcg/tcg-op.h"

#if UINTPTR_MAX == UINT32_MAX
# define ELF_CLASS  ELFCLASS32
#else
# define ELF_CLASS  ELFCLASS64
#endif
#if HOST_BIG_ENDIAN
# define ELF_DATA   ELFDATA2MSB
#else
# define ELF_DATA   ELFDATA2LSB
#endif

#include "elf.h"
#include "exec/log.h"
#include "tcg/tcg-ldst.h"
#include "tcg-internal.h"

#ifdef CONFIG_TCG_INTERPRETER
#include <ffi.h>
#endif

/* Forward declarations for functions declared in tcg-target.c.inc and
   used here. */
static void tcg_target_init(TCGContext *s);
static void tcg_target_qemu_prologue(TCGContext *s);
static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
                        intptr_t value, intptr_t addend);

/* The CIE and FDE header definitions will be common to all hosts.  */
typedef struct {
    uint32_t len __attribute__((aligned((sizeof(void *)))));
    uint32_t id;
    uint8_t version;
    char augmentation[1];
    uint8_t code_align;
    uint8_t data_align;
    uint8_t return_column;
} DebugFrameCIE;

typedef struct QEMU_PACKED {
    uint32_t len __attribute__((aligned((sizeof(void *)))));
    uint32_t cie_offset;
    uintptr_t func_start;
    uintptr_t func_len;
} DebugFrameFDEHeader;

typedef struct QEMU_PACKED {
    DebugFrameCIE cie;
    DebugFrameFDEHeader fde;
} DebugFrameHeader;

static void tcg_register_jit_int(const void *buf, size_t size,
                                 const void *debug_frame,
                                 size_t debug_frame_size)
    __attribute__((unused));

/* Forward declarations for functions declared and used in tcg-target.c.inc. */
static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg1,
                       intptr_t arg2);
static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg);
static void tcg_out_movi(TCGContext *s, TCGType type,
                         TCGReg ret, tcg_target_long arg);
static void tcg_out_op(TCGContext *s, TCGOpcode opc,
                       const TCGArg args[TCG_MAX_OP_ARGS],
                       const int const_args[TCG_MAX_OP_ARGS]);
#if TCG_TARGET_MAYBE_vec
static bool tcg_out_dup_vec(TCGContext *s, TCGType type, unsigned vece,
                            TCGReg dst, TCGReg src);
static bool tcg_out_dupm_vec(TCGContext *s, TCGType type, unsigned vece,
                             TCGReg dst, TCGReg base, intptr_t offset);
static void tcg_out_dupi_vec(TCGContext *s, TCGType type, unsigned vece,
                             TCGReg dst, int64_t arg);
static void tcg_out_vec_op(TCGContext *s, TCGOpcode opc,
                           unsigned vecl, unsigned vece,
                           const TCGArg args[TCG_MAX_OP_ARGS],
                           const int const_args[TCG_MAX_OP_ARGS]);
#else
static inline bool tcg_out_dup_vec(TCGContext *s, TCGType type, unsigned vece,
                                   TCGReg dst, TCGReg src)
{
    g_assert_not_reached();
}
static inline bool tcg_out_dupm_vec(TCGContext *s, TCGType type, unsigned vece,
                                    TCGReg dst, TCGReg base, intptr_t offset)
{
    g_assert_not_reached();
}
static inline void tcg_out_dupi_vec(TCGContext *s, TCGType type, unsigned vece,
                                    TCGReg dst, int64_t arg)
{
    g_assert_not_reached();
}
static inline void tcg_out_vec_op(TCGContext *s, TCGOpcode opc,
                                  unsigned vecl, unsigned vece,
                                  const TCGArg args[TCG_MAX_OP_ARGS],
                                  const int const_args[TCG_MAX_OP_ARGS])
{
    g_assert_not_reached();
}
#endif
static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg, TCGReg arg1,
                       intptr_t arg2);
static bool tcg_out_sti(TCGContext *s, TCGType type, TCGArg val,
                        TCGReg base, intptr_t ofs);
#ifdef CONFIG_TCG_INTERPRETER
static void tcg_out_call(TCGContext *s, const tcg_insn_unit *target,
                         ffi_cif *cif);
#else
static void tcg_out_call(TCGContext *s, const tcg_insn_unit *target);
#endif
static bool tcg_target_const_match(int64_t val, TCGType type, int ct);
#ifdef TCG_TARGET_NEED_LDST_LABELS
static int tcg_out_ldst_finalize(TCGContext *s);
#endif

TCGContext tcg_init_ctx;
__thread TCGContext *tcg_ctx;

TCGContext **tcg_ctxs;
unsigned int tcg_cur_ctxs;
unsigned int tcg_max_ctxs;
TCGv_env cpu_env = 0;
const void *tcg_code_gen_epilogue;
uintptr_t tcg_splitwx_diff;

#ifndef CONFIG_TCG_INTERPRETER
tcg_prologue_fn *tcg_qemu_tb_exec;
#endif

static TCGRegSet tcg_target_available_regs[TCG_TYPE_COUNT];
static TCGRegSet tcg_target_call_clobber_regs;

#if TCG_TARGET_INSN_UNIT_SIZE == 1
static __attribute__((unused)) inline void tcg_out8(TCGContext *s, uint8_t v)
{
    *s->code_ptr++ = v;
}

static __attribute__((unused)) inline void tcg_patch8(tcg_insn_unit *p,
                                                      uint8_t v)
{
    *p = v;
}
#endif

#if TCG_TARGET_INSN_UNIT_SIZE <= 2
static __attribute__((unused)) inline void tcg_out16(TCGContext *s, uint16_t v)
{
    if (TCG_TARGET_INSN_UNIT_SIZE == 2) {
        *s->code_ptr++ = v;
    } else {
        tcg_insn_unit *p = s->code_ptr;
        memcpy(p, &v, sizeof(v));
        s->code_ptr = p + (2 / TCG_TARGET_INSN_UNIT_SIZE);
    }
}

static __attribute__((unused)) inline void tcg_patch16(tcg_insn_unit *p,
                                                       uint16_t v)
{
    if (TCG_TARGET_INSN_UNIT_SIZE == 2) {
        *p = v;
    } else {
        memcpy(p, &v, sizeof(v));
    }
}
#endif

#if TCG_TARGET_INSN_UNIT_SIZE <= 4
static __attribute__((unused)) inline void tcg_out32(TCGContext *s, uint32_t v)
{
    if (TCG_TARGET_INSN_UNIT_SIZE == 4) {
        *s->code_ptr++ = v;
    } else {
        tcg_insn_unit *p = s->code_ptr;
        memcpy(p, &v, sizeof(v));
        s->code_ptr = p + (4 / TCG_TARGET_INSN_UNIT_SIZE);
    }
}

static __attribute__((unused)) inline void tcg_patch32(tcg_insn_unit *p,
                                                       uint32_t v)
{
    if (TCG_TARGET_INSN_UNIT_SIZE == 4) {
        *p = v;
    } else {
        memcpy(p, &v, sizeof(v));
    }
}
#endif

#if TCG_TARGET_INSN_UNIT_SIZE <= 8
static __attribute__((unused)) inline void tcg_out64(TCGContext *s, uint64_t v)
{
    if (TCG_TARGET_INSN_UNIT_SIZE == 8) {
        *s->code_ptr++ = v;
    } else {
        tcg_insn_unit *p = s->code_ptr;
        memcpy(p, &v, sizeof(v));
        s->code_ptr = p + (8 / TCG_TARGET_INSN_UNIT_SIZE);
    }
}

static __attribute__((unused)) inline void tcg_patch64(tcg_insn_unit *p,
                                                       uint64_t v)
{
    if (TCG_TARGET_INSN_UNIT_SIZE == 8) {
        *p = v;
    } else {
        memcpy(p, &v, sizeof(v));
    }
}
#endif

/* label relocation processing */

static void tcg_out_reloc(TCGContext *s, tcg_insn_unit *code_ptr, int type,
                          TCGLabel *l, intptr_t addend)
{
    TCGRelocation *r = tcg_malloc(sizeof(TCGRelocation));

    r->type = type;
    r->ptr = code_ptr;
    r->addend = addend;
    QSIMPLEQ_INSERT_TAIL(&l->relocs, r, next);
}

static void tcg_out_label(TCGContext *s, TCGLabel *l)
{
    tcg_debug_assert(!l->has_value);
    l->has_value = 1;
    l->u.value_ptr = tcg_splitwx_to_rx(s->code_ptr);
}

TCGLabel *gen_new_label(void)
{
    TCGContext *s = tcg_ctx;
    TCGLabel *l = tcg_malloc(sizeof(TCGLabel));

    memset(l, 0, sizeof(TCGLabel));
    l->id = s->nb_labels++;
    QSIMPLEQ_INIT(&l->relocs);

    QSIMPLEQ_INSERT_TAIL(&s->labels, l, next);

    return l;
}

static bool tcg_resolve_relocs(TCGContext *s)
{
    TCGLabel *l;

    QSIMPLEQ_FOREACH(l, &s->labels, next) {
        TCGRelocation *r;
        uintptr_t value = l->u.value;

        QSIMPLEQ_FOREACH(r, &l->relocs, next) {
            if (!patch_reloc(r->ptr, r->type, value, r->addend)) {
                return false;
            }
        }
    }
    return true;
}

static void set_jmp_reset_offset(TCGContext *s, int which)
{
    /*
     * We will check for overflow at the end of the opcode loop in
     * tcg_gen_code, where we bound tcg_current_code_size to UINT16_MAX.
     */
    s->tb_jmp_reset_offset[which] = tcg_current_code_size(s);
}

/* Signal overflow, starting over with fewer guest insns. */
static G_NORETURN
void tcg_raise_tb_overflow(TCGContext *s)
{
    siglongjmp(s->jmp_trans, -2);
}

#define C_PFX1(P, A)                    P##A
#define C_PFX2(P, A, B)                 P##A##_##B
#define C_PFX3(P, A, B, C)              P##A##_##B##_##C
#define C_PFX4(P, A, B, C, D)           P##A##_##B##_##C##_##D
#define C_PFX5(P, A, B, C, D, E)        P##A##_##B##_##C##_##D##_##E
#define C_PFX6(P, A, B, C, D, E, F)     P##A##_##B##_##C##_##D##_##E##_##F

/* Define an enumeration for the various combinations. */

#define C_O0_I1(I1)                     C_PFX1(c_o0_i1_, I1),
#define C_O0_I2(I1, I2)                 C_PFX2(c_o0_i2_, I1, I2),
#define C_O0_I3(I1, I2, I3)             C_PFX3(c_o0_i3_, I1, I2, I3),
#define C_O0_I4(I1, I2, I3, I4)         C_PFX4(c_o0_i4_, I1, I2, I3, I4),

#define C_O1_I1(O1, I1)                 C_PFX2(c_o1_i1_, O1, I1),
#define C_O1_I2(O1, I1, I2)             C_PFX3(c_o1_i2_, O1, I1, I2),
#define C_O1_I3(O1, I1, I2, I3)         C_PFX4(c_o1_i3_, O1, I1, I2, I3),
#define C_O1_I4(O1, I1, I2, I3, I4)     C_PFX5(c_o1_i4_, O1, I1, I2, I3, I4),

#define C_N1_I2(O1, I1, I2)             C_PFX3(c_n1_i2_, O1, I1, I2),

#define C_O2_I1(O1, O2, I1)             C_PFX3(c_o2_i1_, O1, O2, I1),
#define C_O2_I2(O1, O2, I1, I2)         C_PFX4(c_o2_i2_, O1, O2, I1, I2),
#define C_O2_I3(O1, O2, I1, I2, I3)     C_PFX5(c_o2_i3_, O1, O2, I1, I2, I3),
#define C_O2_I4(O1, O2, I1, I2, I3, I4) C_PFX6(c_o2_i4_, O1, O2, I1, I2, I3, I4),

typedef enum {
#include "tcg-target-con-set.h"
} TCGConstraintSetIndex;

static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode);

#undef C_O0_I1
#undef C_O0_I2
#undef C_O0_I3
#undef C_O0_I4
#undef C_O1_I1
#undef C_O1_I2
#undef C_O1_I3
#undef C_O1_I4
#undef C_N1_I2
#undef C_O2_I1
#undef C_O2_I2
#undef C_O2_I3
#undef C_O2_I4

/* Put all of the constraint sets into an array, indexed by the enum. */

#define C_O0_I1(I1)                     { .args_ct_str = { #I1 } },
#define C_O0_I2(I1, I2)                 { .args_ct_str = { #I1, #I2 } },
#define C_O0_I3(I1, I2, I3)             { .args_ct_str = { #I1, #I2, #I3 } },
#define C_O0_I4(I1, I2, I3, I4)         { .args_ct_str = { #I1, #I2, #I3, #I4 } },

#define C_O1_I1(O1, I1)                 { .args_ct_str = { #O1, #I1 } },
#define C_O1_I2(O1, I1, I2)             { .args_ct_str = { #O1, #I1, #I2 } },
#define C_O1_I3(O1, I1, I2, I3)         { .args_ct_str = { #O1, #I1, #I2, #I3 } },
#define C_O1_I4(O1, I1, I2, I3, I4)     { .args_ct_str = { #O1, #I1, #I2, #I3, #I4 } },

#define C_N1_I2(O1, I1, I2)             { .args_ct_str = { "&" #O1, #I1, #I2 } },

#define C_O2_I1(O1, O2, I1)             { .args_ct_str = { #O1, #O2, #I1 } },
#define C_O2_I2(O1, O2, I1, I2)         { .args_ct_str = { #O1, #O2, #I1, #I2 } },
#define C_O2_I3(O1, O2, I1, I2, I3)     { .args_ct_str = { #O1, #O2, #I1, #I2, #I3 } },
#define C_O2_I4(O1, O2, I1, I2, I3, I4) { .args_ct_str = { #O1, #O2, #I1, #I2, #I3, #I4 } },

static const TCGTargetOpDef constraint_sets[] = {
#include "tcg-target-con-set.h"
};


#undef C_O0_I1
#undef C_O0_I2
#undef C_O0_I3
#undef C_O0_I4
#undef C_O1_I1
#undef C_O1_I2
#undef C_O1_I3
#undef C_O1_I4
#undef C_N1_I2
#undef C_O2_I1
#undef C_O2_I2
#undef C_O2_I3
#undef C_O2_I4

/* Expand the enumerator to be returned from tcg_target_op_def(). */

#define C_O0_I1(I1)                     C_PFX1(c_o0_i1_, I1)
#define C_O0_I2(I1, I2)                 C_PFX2(c_o0_i2_, I1, I2)
#define C_O0_I3(I1, I2, I3)             C_PFX3(c_o0_i3_, I1, I2, I3)
#define C_O0_I4(I1, I2, I3, I4)         C_PFX4(c_o0_i4_, I1, I2, I3, I4)

#define C_O1_I1(O1, I1)                 C_PFX2(c_o1_i1_, O1, I1)
#define C_O1_I2(O1, I1, I2)             C_PFX3(c_o1_i2_, O1, I1, I2)
#define C_O1_I3(O1, I1, I2, I3)         C_PFX4(c_o1_i3_, O1, I1, I2, I3)
#define C_O1_I4(O1, I1, I2, I3, I4)     C_PFX5(c_o1_i4_, O1, I1, I2, I3, I4)

#define C_N1_I2(O1, I1, I2)             C_PFX3(c_n1_i2_, O1, I1, I2)

#define C_O2_I1(O1, O2, I1)             C_PFX3(c_o2_i1_, O1, O2, I1)
#define C_O2_I2(O1, O2, I1, I2)         C_PFX4(c_o2_i2_, O1, O2, I1, I2)
#define C_O2_I3(O1, O2, I1, I2, I3)     C_PFX5(c_o2_i3_, O1, O2, I1, I2, I3)
#define C_O2_I4(O1, O2, I1, I2, I3, I4) C_PFX6(c_o2_i4_, O1, O2, I1, I2, I3, I4)

#include "tcg-target.c.inc"

static void alloc_tcg_plugin_context(TCGContext *s)
{
#ifdef CONFIG_PLUGIN
    s->plugin_tb = g_new0(struct qemu_plugin_tb, 1);
    s->plugin_tb->insns =
        g_ptr_array_new_with_free_func(qemu_plugin_insn_cleanup_fn);
#endif
}

/*
 * All TCG threads except the parent (i.e. the one that called tcg_context_init
 * and registered the target's TCG globals) must register with this function
 * before initiating translation.
 *
 * In user-mode we just point tcg_ctx to tcg_init_ctx. See the documentation
 * of tcg_region_init() for the reasoning behind this.
 *
 * In softmmu each caller registers its context in tcg_ctxs[]. Note that in
 * softmmu tcg_ctxs[] does not track tcg_ctx_init, since the initial context
 * is not used anymore for translation once this function is called.
 *
 * Not tracking tcg_init_ctx in tcg_ctxs[] in softmmu keeps code that iterates
 * over the array (e.g. tcg_code_size() the same for both softmmu and user-mode.
 */
#ifdef CONFIG_USER_ONLY
void tcg_register_thread(void)
{
    tcg_ctx = &tcg_init_ctx;
}
#else
void tcg_register_thread(void)
{
    TCGContext *s = g_malloc(sizeof(*s));
    unsigned int i, n;

    *s = tcg_init_ctx;

    /* Relink mem_base.  */
    for (i = 0, n = tcg_init_ctx.nb_globals; i < n; ++i) {
        if (tcg_init_ctx.temps[i].mem_base) {
            ptrdiff_t b = tcg_init_ctx.temps[i].mem_base - tcg_init_ctx.temps;
            tcg_debug_assert(b >= 0 && b < n);
            s->temps[i].mem_base = &s->temps[b];
        }
    }

    /* Claim an entry in tcg_ctxs */
    n = qatomic_fetch_inc(&tcg_cur_ctxs);
    g_assert(n < tcg_max_ctxs);
    qatomic_set(&tcg_ctxs[n], s);

    if (n > 0) {
        alloc_tcg_plugin_context(s);
        tcg_region_initial_alloc(s);
    }

    tcg_ctx = s;
}
#endif /* !CONFIG_USER_ONLY */

/* pool based memory allocation */
void *tcg_malloc_internal(TCGContext *s, int size)
{
    TCGPool *p;
    int pool_size;
    
    if (size > TCG_POOL_CHUNK_SIZE) {
        /* big malloc: insert a new pool (XXX: could optimize) */
        p = g_malloc(sizeof(TCGPool) + size);
        p->size = size;
        p->next = s->pool_first_large;
        s->pool_first_large = p;
        return p->data;
    } else {
        p = s->pool_current;
        if (!p) {
            p = s->pool_first;
            if (!p)
                goto new_pool;
        } else {
            if (!p->next) {
            new_pool:
                pool_size = TCG_POOL_CHUNK_SIZE;
                p = g_malloc(sizeof(TCGPool) + pool_size);
                p->size = pool_size;
                p->next = NULL;
                if (s->pool_current) 
                    s->pool_current->next = p;
                else
                    s->pool_first = p;
            } else {
                p = p->next;
            }
        }
    }
    s->pool_current = p;
    s->pool_cur = p->data + size;
    s->pool_end = p->data + p->size;
    return p->data;
}

void tcg_pool_reset(TCGContext *s)
{
    TCGPool *p, *t;
    for (p = s->pool_first_large; p; p = t) {
        t = p->next;
        g_free(p);
    }
    s->pool_first_large = NULL;
    s->pool_cur = s->pool_end = NULL;
    s->pool_current = NULL;
}

#include "exec/helper-proto.h"

static const TCGHelperInfo all_helpers[] = {
#include "exec/helper-tcg.h"
};
static GHashTable *helper_table;

#ifdef CONFIG_TCG_INTERPRETER
static GHashTable *ffi_table;

static ffi_type * const typecode_to_ffi[8] = {
    [dh_typecode_void] = &ffi_type_void,
    [dh_typecode_i32]  = &ffi_type_uint32,
    [dh_typecode_s32]  = &ffi_type_sint32,
    [dh_typecode_i64]  = &ffi_type_uint64,
    [dh_typecode_s64]  = &ffi_type_sint64,
    [dh_typecode_ptr]  = &ffi_type_pointer,
};
#endif

static int indirect_reg_alloc_order[ARRAY_SIZE(tcg_target_reg_alloc_order)];
static void process_op_defs(TCGContext *s);
static TCGTemp *tcg_global_reg_new_internal(TCGContext *s, TCGType type,
                                            TCGReg reg, const char *name);

static void tcg_context_init(unsigned max_cpus)
{
    TCGContext *s = &tcg_init_ctx;
    int op, total_args, n, i;
    TCGOpDef *def;
    TCGArgConstraint *args_ct;
    TCGTemp *ts;

    memset(s, 0, sizeof(*s));
    s->nb_globals = 0;

    /* Count total number of arguments and allocate the corresponding
       space */
    total_args = 0;
    for(op = 0; op < NB_OPS; op++) {
        def = &tcg_op_defs[op];
        n = def->nb_iargs + def->nb_oargs;
        total_args += n;
    }

    args_ct = g_new0(TCGArgConstraint, total_args);

    for(op = 0; op < NB_OPS; op++) {
        def = &tcg_op_defs[op];
        def->args_ct = args_ct;
        n = def->nb_iargs + def->nb_oargs;
        args_ct += n;
    }

    /* Register helpers.  */
    /* Use g_direct_hash/equal for direct pointer comparisons on func.  */
    helper_table = g_hash_table_new(NULL, NULL);

    for (i = 0; i < ARRAY_SIZE(all_helpers); ++i) {
        g_hash_table_insert(helper_table, (gpointer)all_helpers[i].func,
                            (gpointer)&all_helpers[i]);
    }

#ifdef CONFIG_TCG_INTERPRETER
    /* g_direct_hash/equal for direct comparisons on uint32_t.  */
    ffi_table = g_hash_table_new(NULL, NULL);
    for (i = 0; i < ARRAY_SIZE(all_helpers); ++i) {
        struct {
            ffi_cif cif;
            ffi_type *args[];
        } *ca;
        uint32_t typemask = all_helpers[i].typemask;
        gpointer hash = (gpointer)(uintptr_t)typemask;
        ffi_status status;
        int nargs;

        if (g_hash_table_lookup(ffi_table, hash)) {
            continue;
        }

        /* Ignoring the return type, find the last non-zero field. */
        nargs = 32 - clz32(typemask >> 3);
        nargs = DIV_ROUND_UP(nargs, 3);

        ca = g_malloc0(sizeof(*ca) + nargs * sizeof(ffi_type *));
        ca->cif.rtype = typecode_to_ffi[typemask & 7];
        ca->cif.nargs = nargs;

        if (nargs != 0) {
            ca->cif.arg_types = ca->args;
            for (i = 0; i < nargs; ++i) {
                int typecode = extract32(typemask, (i + 1) * 3, 3);
                ca->args[i] = typecode_to_ffi[typecode];
            }
        }

        status = ffi_prep_cif(&ca->cif, FFI_DEFAULT_ABI, nargs,
                              ca->cif.rtype, ca->cif.arg_types);
        assert(status == FFI_OK);

        g_hash_table_insert(ffi_table, hash, (gpointer)&ca->cif);
    }
#endif

    tcg_target_init(s);
    process_op_defs(s);

    /* Reverse the order of the saved registers, assuming they're all at
       the start of tcg_target_reg_alloc_order.  */
    for (n = 0; n < ARRAY_SIZE(tcg_target_reg_alloc_order); ++n) {
        int r = tcg_target_reg_alloc_order[n];
        if (tcg_regset_test_reg(tcg_target_call_clobber_regs, r)) {
            break;
        }
    }
    for (i = 0; i < n; ++i) {
        indirect_reg_alloc_order[i] = tcg_target_reg_alloc_order[n - 1 - i];
    }
    for (; i < ARRAY_SIZE(tcg_target_reg_alloc_order); ++i) {
        indirect_reg_alloc_order[i] = tcg_target_reg_alloc_order[i];
    }

    alloc_tcg_plugin_context(s);

    tcg_ctx = s;
    /*
     * In user-mode we simply share the init context among threads, since we
     * use a single region. See the documentation tcg_region_init() for the
     * reasoning behind this.
     * In softmmu we will have at most max_cpus TCG threads.
     */
#ifdef CONFIG_USER_ONLY
    tcg_ctxs = &tcg_ctx;
    tcg_cur_ctxs = 1;
    tcg_max_ctxs = 1;
#else
    tcg_max_ctxs = max_cpus;
    tcg_ctxs = g_new0(TCGContext *, max_cpus);
#endif

    tcg_debug_assert(!tcg_regset_test_reg(s->reserved_regs, TCG_AREG0));
    ts = tcg_global_reg_new_internal(s, TCG_TYPE_PTR, TCG_AREG0, "env");
    cpu_env = temp_tcgv_ptr(ts);
}

void tcg_init(size_t tb_size, int splitwx, unsigned max_cpus)
{
    tcg_context_init(max_cpus);
    tcg_region_init(tb_size, splitwx, max_cpus);
}

/*
 * Allocate TBs right before their corresponding translated code, making
 * sure that TBs and code are on different cache lines.
 */
TranslationBlock *tcg_tb_alloc(TCGContext *s)
{
    uintptr_t align = qemu_icache_linesize;
    TranslationBlock *tb;
    void *next;

 retry:
    tb = (void *)ROUND_UP((uintptr_t)s->code_gen_ptr, align);
    next = (void *)ROUND_UP((uintptr_t)(tb + 1), align);

    if (unlikely(next > s->code_gen_highwater)) {
        if (tcg_region_alloc(s)) {
            return NULL;
        }
        goto retry;
    }
    qatomic_set(&s->code_gen_ptr, next);
    s->data_gen_ptr = NULL;
    return tb;
}

void tcg_prologue_init(TCGContext *s)
{
    size_t prologue_size;

    s->code_ptr = s->code_gen_ptr;
    s->code_buf = s->code_gen_ptr;
    s->data_gen_ptr = NULL;

#ifndef CONFIG_TCG_INTERPRETER
    tcg_qemu_tb_exec = (tcg_prologue_fn *)tcg_splitwx_to_rx(s->code_ptr);
#endif

#ifdef TCG_TARGET_NEED_POOL_LABELS
    s->pool_labels = NULL;
#endif

    qemu_thread_jit_write();
    /* Generate the prologue.  */
    tcg_target_qemu_prologue(s);

#ifdef TCG_TARGET_NEED_POOL_LABELS
    /* Allow the prologue to put e.g. guest_base into a pool entry.  */
    {
        int result = tcg_out_pool_finalize(s);
        tcg_debug_assert(result == 0);
    }
#endif

    prologue_size = tcg_current_code_size(s);

#ifndef CONFIG_TCG_INTERPRETER
    flush_idcache_range((uintptr_t)tcg_splitwx_to_rx(s->code_buf),
                        (uintptr_t)s->code_buf, prologue_size);
#endif

#ifdef DEBUG_DISAS
    if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
        FILE *logfile = qemu_log_trylock();
        if (logfile) {
            fprintf(logfile, "PROLOGUE: [size=%zu]\n", prologue_size);
            if (s->data_gen_ptr) {
                size_t code_size = s->data_gen_ptr - s->code_gen_ptr;
                size_t data_size = prologue_size - code_size;
                size_t i;

                disas(logfile, s->code_gen_ptr, code_size);

                for (i = 0; i < data_size; i += sizeof(tcg_target_ulong)) {
                    if (sizeof(tcg_target_ulong) == 8) {
                        fprintf(logfile,
                                "0x%08" PRIxPTR ":  .quad  0x%016" PRIx64 "\n",
                                (uintptr_t)s->data_gen_ptr + i,
                                *(uint64_t *)(s->data_gen_ptr + i));
                    } else {
                        fprintf(logfile,
                                "0x%08" PRIxPTR ":  .long  0x%08x\n",
                                (uintptr_t)s->data_gen_ptr + i,
                                *(uint32_t *)(s->data_gen_ptr + i));
                    }
                }
            } else {
                disas(logfile, s->code_gen_ptr, prologue_size);
            }
            fprintf(logfile, "\n");
            qemu_log_unlock(logfile);
        }
    }
#endif

#ifndef CONFIG_TCG_INTERPRETER
    /*
     * Assert that goto_ptr is implemented completely, setting an epilogue.
     * For tci, we use NULL as the signal to return from the interpreter,
     * so skip this check.
     */
    tcg_debug_assert(tcg_code_gen_epilogue != NULL);
#endif

    tcg_region_prologue_set(s);
}

void tcg_func_start(TCGContext *s)
{
    tcg_pool_reset(s);
    s->nb_temps = s->nb_globals;

    /* No temps have been previously allocated for size or locality.  */
    memset(s->free_temps, 0, sizeof(s->free_temps));

    /* No constant temps have been previously allocated. */
    for (int i = 0; i < TCG_TYPE_COUNT; ++i) {
        if (s->const_table[i]) {
            g_hash_table_remove_all(s->const_table[i]);
        }
    }

    s->nb_ops = 0;
    s->nb_labels = 0;
    s->current_frame_offset = s->frame_start;

#ifdef CONFIG_DEBUG_TCG
    s->goto_tb_issue_mask = 0;
#endif

    QTAILQ_INIT(&s->ops);
    QTAILQ_INIT(&s->free_ops);
    QSIMPLEQ_INIT(&s->labels);
}

static TCGTemp *tcg_temp_alloc(TCGContext *s)
{
    int n = s->nb_temps++;

    if (n >= TCG_MAX_TEMPS) {
        tcg_raise_tb_overflow(s);
    }
    return memset(&s->temps[n], 0, sizeof(TCGTemp));
}

static TCGTemp *tcg_global_alloc(TCGContext *s)
{
    TCGTemp *ts;

    tcg_debug_assert(s->nb_globals == s->nb_temps);
    tcg_debug_assert(s->nb_globals < TCG_MAX_TEMPS);
    s->nb_globals++;
    ts = tcg_temp_alloc(s);
    ts->kind = TEMP_GLOBAL;

    return ts;
}

static TCGTemp *tcg_global_reg_new_internal(TCGContext *s, TCGType type,
                                            TCGReg reg, const char *name)
{
    TCGTemp *ts;

    if (TCG_TARGET_REG_BITS == 32 && type != TCG_TYPE_I32) {
        tcg_abort();
    }

    ts = tcg_global_alloc(s);
    ts->base_type = type;
    ts->type = type;
    ts->kind = TEMP_FIXED;
    ts->reg = reg;
    ts->name = name;
    tcg_regset_set_reg(s->reserved_regs, reg);

    return ts;
}

void tcg_set_frame(TCGContext *s, TCGReg reg, intptr_t start, intptr_t size)
{
    s->frame_start = start;
    s->frame_end = start + size;
    s->frame_temp
        = tcg_global_reg_new_internal(s, TCG_TYPE_PTR, reg, "_frame");
}

TCGTemp *tcg_global_mem_new_internal(TCGType type, TCGv_ptr base,
                                     intptr_t offset, const char *name)
{
    TCGContext *s = tcg_ctx;
    TCGTemp *base_ts = tcgv_ptr_temp(base);
    TCGTemp *ts = tcg_global_alloc(s);
    int indirect_reg = 0, bigendian = 0;
#if HOST_BIG_ENDIAN
    bigendian = 1;
#endif

    switch (base_ts->kind) {
    case TEMP_FIXED:
        break;
    case TEMP_GLOBAL:
        /* We do not support double-indirect registers.  */
        tcg_debug_assert(!base_ts->indirect_reg);
        base_ts->indirect_base = 1;
        s->nb_indirects += (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64
                            ? 2 : 1);
        indirect_reg = 1;
        break;
    default:
        g_assert_not_reached();
    }

    if (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64) {
        TCGTemp *ts2 = tcg_global_alloc(s);
        char buf[64];

        ts->base_type = TCG_TYPE_I64;
        ts->type = TCG_TYPE_I32;
        ts->indirect_reg = indirect_reg;
        ts->mem_allocated = 1;
        ts->mem_base = base_ts;
        ts->mem_offset = offset + bigendian * 4;
        pstrcpy(buf, sizeof(buf), name);
        pstrcat(buf, sizeof(buf), "_0");
        ts->name = strdup(buf);

        tcg_debug_assert(ts2 == ts + 1);
        ts2->base_type = TCG_TYPE_I64;
        ts2->type = TCG_TYPE_I32;
        ts2->indirect_reg = indirect_reg;
        ts2->mem_allocated = 1;
        ts2->mem_base = base_ts;
        ts2->mem_offset = offset + (1 - bigendian) * 4;
        pstrcpy(buf, sizeof(buf), name);
        pstrcat(buf, sizeof(buf), "_1");
        ts2->name = strdup(buf);
    } else {
        ts->base_type = type;
        ts->type = type;
        ts->indirect_reg = indirect_reg;
        ts->mem_allocated = 1;
        ts->mem_base = base_ts;
        ts->mem_offset = offset;
        ts->name = name;
    }
    return ts;
}

TCGTemp *tcg_temp_new_internal(TCGType type, bool temp_local)
{
    TCGContext *s = tcg_ctx;
    TCGTempKind kind = temp_local ? TEMP_LOCAL : TEMP_NORMAL;
    TCGTemp *ts;
    int idx, k;

    k = type + (temp_local ? TCG_TYPE_COUNT : 0);
    idx = find_first_bit(s->free_temps[k].l, TCG_MAX_TEMPS);
    if (idx < TCG_MAX_TEMPS) {
        /* There is already an available temp with the right type.  */
        clear_bit(idx, s->free_temps[k].l);

        ts = &s->temps[idx];
        ts->temp_allocated = 1;
        tcg_debug_assert(ts->base_type == type);
        tcg_debug_assert(ts->kind == kind);
    } else {
        ts = tcg_temp_alloc(s);
        if (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64) {
            TCGTemp *ts2 = tcg_temp_alloc(s);

            ts->base_type = type;
            ts->type = TCG_TYPE_I32;
            ts->temp_allocated = 1;
            ts->kind = kind;

            tcg_debug_assert(ts2 == ts + 1);
            ts2->base_type = TCG_TYPE_I64;
            ts2->type = TCG_TYPE_I32;
            ts2->temp_allocated = 1;
            ts2->kind = kind;
        } else {
            ts->base_type = type;
            ts->type = type;
            ts->temp_allocated = 1;
            ts->kind = kind;
        }
    }

#if defined(CONFIG_DEBUG_TCG)
    s->temps_in_use++;
#endif
    return ts;
}

TCGv_vec tcg_temp_new_vec(TCGType type)
{
    TCGTemp *t;

#ifdef CONFIG_DEBUG_TCG
    switch (type) {
    case TCG_TYPE_V64:
        assert(TCG_TARGET_HAS_v64);
        break;
    case TCG_TYPE_V128:

        assert(TCG_TARGET_HAS_v128);
        break;
    case TCG_TYPE_V256:
        assert(TCG_TARGET_HAS_v256);
        break;
    default:
        g_assert_not_reached();
    }
#endif

    t = tcg_temp_new_internal(type, 0);
    return temp_tcgv_vec(t);
}

/* Create a new temp of the same type as an existing temp.  */
TCGv_vec tcg_temp_new_vec_matching(TCGv_vec match)
{
    TCGTemp *t = tcgv_vec_temp(match);

    tcg_debug_assert(t->temp_allocated != 0);

    t = tcg_temp_new_internal(t->base_type, 0);
    return temp_tcgv_vec(t);
}

void tcg_temp_free_internal(TCGTemp *ts)
{
    TCGContext *s = tcg_ctx;
    int k, idx;

    switch (ts->kind) {
    case TEMP_CONST:
        /*
         * In order to simplify users of tcg_constant_*,
         * silently ignore free.
         */
        return;
    case TEMP_NORMAL:
    case TEMP_LOCAL:
        break;
    default:
        g_assert_not_reached();
    }

#if defined(CONFIG_DEBUG_TCG)
    s->temps_in_use--;
    if (s->temps_in_use < 0) {
        fprintf(stderr, "More temporaries freed than allocated!\n");
    }
#endif

    tcg_debug_assert(ts->temp_allocated != 0);
    ts->temp_allocated = 0;

    idx = temp_idx(ts);
    k = ts->base_type + (ts->kind == TEMP_NORMAL ? 0 : TCG_TYPE_COUNT);
    set_bit(idx, s->free_temps[k].l);
}

TCGTemp *tcg_constant_internal(TCGType type, int64_t val)
{
    TCGContext *s = tcg_ctx;
    GHashTable *h = s->const_table[type];
    TCGTemp *ts;

    if (h == NULL) {
        h = g_hash_table_new(g_int64_hash, g_int64_equal);
        s->const_table[type] = h;
    }

    ts = g_hash_table_lookup(h, &val);
    if (ts == NULL) {
        ts = tcg_temp_alloc(s);

        if (TCG_TARGET_REG_BITS == 32 && type == TCG_TYPE_I64) {
            TCGTemp *ts2 = tcg_temp_alloc(s);

            ts->base_type = TCG_TYPE_I64;
            ts->type = TCG_TYPE_I32;
            ts->kind = TEMP_CONST;
            ts->temp_allocated = 1;
            /*
             * Retain the full value of the 64-bit constant in the low
             * part, so that the hash table works.  Actual uses will
             * truncate the value to the low part.
             */
            ts->val = val;

            tcg_debug_assert(ts2 == ts + 1);
            ts2->base_type = TCG_TYPE_I64;
            ts2->type = TCG_TYPE_I32;
            ts2->kind = TEMP_CONST;
            ts2->temp_allocated = 1;
            ts2->val = val >> 32;
        } else {
            ts->base_type = type;
            ts->type = type;
            ts->kind = TEMP_CONST;
            ts->temp_allocated = 1;
            ts->val = val;
        }
        g_hash_table_insert(h, &ts->val, ts);
    }

    return ts;
}

TCGv_vec tcg_constant_vec(TCGType type, unsigned vece, int64_t val)
{
    val = dup_const(vece, val);
    return temp_tcgv_vec(tcg_constant_internal(type, val));
}

TCGv_vec tcg_constant_vec_matching(TCGv_vec match, unsigned vece, int64_t val)
{
    TCGTemp *t = tcgv_vec_temp(match);

    tcg_debug_assert(t->temp_allocated != 0);
    return tcg_constant_vec(t->base_type, vece, val);
}

TCGv_i32 tcg_const_i32(int32_t val)
{
    TCGv_i32 t0;
    t0 = tcg_temp_new_i32();
    tcg_gen_movi_i32(t0, val);
    return t0;
}

TCGv_i64 tcg_const_i64(int64_t val)
{
    TCGv_i64 t0;
    t0 = tcg_temp_new_i64();
    tcg_gen_movi_i64(t0, val);
    return t0;
}

TCGv_i32 tcg_const_local_i32(int32_t val)
{
    TCGv_i32 t0;
    t0 = tcg_temp_local_new_i32();
    tcg_gen_movi_i32(t0, val);
    return t0;
}

TCGv_i64 tcg_const_local_i64(int64_t val)
{
    TCGv_i64 t0;
    t0 = tcg_temp_local_new_i64();
    tcg_gen_movi_i64(t0, val);
    return t0;
}

#if defined(CONFIG_DEBUG_TCG)
void tcg_clear_temp_count(void)
{
    TCGContext *s = tcg_ctx;
    s->temps_in_use = 0;
}

int tcg_check_temp_count(void)
{
    TCGContext *s = tcg_ctx;
    if (s->temps_in_use) {
        /* Clear the count so that we don't give another
         * warning immediately next time around.
         */
        s->temps_in_use = 0;
        return 1;
    }
    return 0;
}
#endif

/* Return true if OP may appear in the opcode stream.
   Test the runtime variable that controls each opcode.  */
bool tcg_op_supported(TCGOpcode op)
{
    const bool have_vec
        = TCG_TARGET_HAS_v64 | TCG_TARGET_HAS_v128 | TCG_TARGET_HAS_v256;

    switch (op) {
    case INDEX_op_discard:
    case INDEX_op_set_label:
    case INDEX_op_call:
    case INDEX_op_br:
    case INDEX_op_mb:
    case INDEX_op_insn_start:
    case INDEX_op_exit_tb:
    case INDEX_op_goto_tb:
    case INDEX_op_goto_ptr:
    case INDEX_op_qemu_ld_i32:
    case INDEX_op_qemu_st_i32:
    case INDEX_op_qemu_ld_i64:
    case INDEX_op_qemu_st_i64:
        return true;

    case INDEX_op_qemu_st8_i32:
        return TCG_TARGET_HAS_qemu_st8_i32;

    case INDEX_op_mov_i32:
    case INDEX_op_setcond_i32:
    case INDEX_op_brcond_i32:
    case INDEX_op_ld8u_i32:
    case INDEX_op_ld8s_i32:
    case INDEX_op_ld16u_i32:
    case INDEX_op_ld16s_i32:
    case INDEX_op_ld_i32:
    case INDEX_op_st8_i32:
    case INDEX_op_st16_i32:
    case INDEX_op_st_i32:
    case INDEX_op_add_i32:
    case INDEX_op_sub_i32:
    case INDEX_op_mul_i32:
    case INDEX_op_and_i32:
    case INDEX_op_or_i32:
    case INDEX_op_xor_i32:
    case INDEX_op_shl_i32:
    case INDEX_op_shr_i32:
    case INDEX_op_sar_i32:
        return true;

    case INDEX_op_movcond_i32:
        return TCG_TARGET_HAS_movcond_i32;
    case INDEX_op_div_i32:
    case INDEX_op_divu_i32:
        return TCG_TARGET_HAS_div_i32;
    case INDEX_op_rem_i32:
    case INDEX_op_remu_i32:
        return TCG_TARGET_HAS_rem_i32;
    case INDEX_op_div2_i32:
    case INDEX_op_divu2_i32:
        return TCG_TARGET_HAS_div2_i32;
    case INDEX_op_rotl_i32:
    case INDEX_op_rotr_i32:
        return TCG_TARGET_HAS_rot_i32;
    case INDEX_op_deposit_i32:
        return TCG_TARGET_HAS_deposit_i32;
    case INDEX_op_extract_i32:
        return TCG_TARGET_HAS_extract_i32;
    case INDEX_op_sextract_i32:
        return TCG_TARGET_HAS_sextract_i32;
    case INDEX_op_extract2_i32:
        return TCG_TARGET_HAS_extract2_i32;
    case INDEX_op_add2_i32:
        return TCG_TARGET_HAS_add2_i32;
    case INDEX_op_sub2_i32:
        return TCG_TARGET_HAS_sub2_i32;
    case INDEX_op_mulu2_i32:
        return TCG_TARGET_HAS_mulu2_i32;
    case INDEX_op_muls2_i32:
        return TCG_TARGET_HAS_muls2_i32;
    case INDEX_op_muluh_i32:
        return TCG_TARGET_HAS_muluh_i32;
    case INDEX_op_mulsh_i32:
        return TCG_TARGET_HAS_mulsh_i32;
    case INDEX_op_ext8s_i32:
        return TCG_TARGET_HAS_ext8s_i32;
    case INDEX_op_ext16s_i32:
        return TCG_TARGET_HAS_ext16s_i32;
    case INDEX_op_ext8u_i32:
        return TCG_TARGET_HAS_ext8u_i32;
    case INDEX_op_ext16u_i32:
        return TCG_TARGET_HAS_ext16u_i32;
    case INDEX_op_bswap16_i32:
        return TCG_TARGET_HAS_bswap16_i32;
    case INDEX_op_bswap32_i32:
        return TCG_TARGET_HAS_bswap32_i32;
    case INDEX_op_not_i32:
        return TCG_TARGET_HAS_not_i32;
    case INDEX_op_neg_i32:
        return TCG_TARGET_HAS_neg_i32;
    case INDEX_op_andc_i32:
        return TCG_TARGET_HAS_andc_i32;
    case INDEX_op_orc_i32:
        return TCG_TARGET_HAS_orc_i32;
    case INDEX_op_eqv_i32:
        return TCG_TARGET_HAS_eqv_i32;
    case INDEX_op_nand_i32:
        return TCG_TARGET_HAS_nand_i32;
    case INDEX_op_nor_i32:
        return TCG_TARGET_HAS_nor_i32;
    case INDEX_op_clz_i32:
        return TCG_TARGET_HAS_clz_i32;
    case INDEX_op_ctz_i32:
        return TCG_TARGET_HAS_ctz_i32;
    case INDEX_op_ctpop_i32:
        return TCG_TARGET_HAS_ctpop_i32;

    case INDEX_op_brcond2_i32:
    case INDEX_op_setcond2_i32:
        return TCG_TARGET_REG_BITS == 32;

    case INDEX_op_mov_i64:
    case INDEX_op_setcond_i64:
    case INDEX_op_brcond_i64:
    case INDEX_op_ld8u_i64:
    case INDEX_op_ld8s_i64:
    case INDEX_op_ld16u_i64:
    case INDEX_op_ld16s_i64:
    case INDEX_op_ld32u_i64:
    case INDEX_op_ld32s_i64:
    case INDEX_op_ld_i64:
    case INDEX_op_st8_i64:
    case INDEX_op_st16_i64:
    case INDEX_op_st32_i64:
    case INDEX_op_st_i64:
    case INDEX_op_add_i64:
    case INDEX_op_sub_i64:
    case INDEX_op_mul_i64:
    case INDEX_op_and_i64:
    case INDEX_op_or_i64:
    case INDEX_op_xor_i64:
    case INDEX_op_shl_i64:
    case INDEX_op_shr_i64:
    case INDEX_op_sar_i64:
    case INDEX_op_ext_i32_i64:
    case INDEX_op_extu_i32_i64:
        return TCG_TARGET_REG_BITS == 64;

    case INDEX_op_movcond_i64:
        return TCG_TARGET_HAS_movcond_i64;
    case INDEX_op_div_i64:
    case INDEX_op_divu_i64:
        return TCG_TARGET_HAS_div_i64;
    case INDEX_op_rem_i64:
    case INDEX_op_remu_i64:
        return TCG_TARGET_HAS_rem_i64;
    case INDEX_op_div2_i64:
    case INDEX_op_divu2_i64:
        return TCG_TARGET_HAS_div2_i64;
    case INDEX_op_rotl_i64:
    case INDEX_op_rotr_i64:
        return TCG_TARGET_HAS_rot_i64;
    case INDEX_op_deposit_i64:
        return TCG_TARGET_HAS_deposit_i64;
    case INDEX_op_extract_i64:
        return TCG_TARGET_HAS_extract_i64;
    case INDEX_op_sextract_i64:
        return TCG_TARGET_HAS_sextract_i64;
    case INDEX_op_extract2_i64:
        return TCG_TARGET_HAS_extract2_i64;
    case INDEX_op_extrl_i64_i32:
        return TCG_TARGET_HAS_extrl_i64_i32;
    case INDEX_op_extrh_i64_i32:
        return TCG_TARGET_HAS_extrh_i64_i32;
    case INDEX_op_ext8s_i64:
        return TCG_TARGET_HAS_ext8s_i64;
    case INDEX_op_ext16s_i64:
        return TCG_TARGET_HAS_ext16s_i64;
    case INDEX_op_ext32s_i64:
        return TCG_TARGET_HAS_ext32s_i64;
    case INDEX_op_ext8u_i64:
        return TCG_TARGET_HAS_ext8u_i64;
    case INDEX_op_ext16u_i64:
        return TCG_TARGET_HAS_ext16u_i64;
    case INDEX_op_ext32u_i64:
        return TCG_TARGET_HAS_ext32u_i64;
    case INDEX_op_bswap16_i64:
        return TCG_TARGET_HAS_bswap16_i64;
    case INDEX_op_bswap32_i64:
        return TCG_TARGET_HAS_bswap32_i64;
    case INDEX_op_bswap64_i64:
        return TCG_TARGET_HAS_bswap64_i64;
    case INDEX_op_not_i64:
        return TCG_TARGET_HAS_not_i64;
    case INDEX_op_neg_i64:
        return TCG_TARGET_HAS_neg_i64;
    case INDEX_op_andc_i64:
        return TCG_TARGET_HAS_andc_i64;
    case INDEX_op_orc_i64:
        return TCG_TARGET_HAS_orc_i64;
    case INDEX_op_eqv_i64:
        return TCG_TARGET_HAS_eqv_i64;
    case INDEX_op_nand_i64:
        return TCG_TARGET_HAS_nand_i64;
    case INDEX_op_nor_i64:
        return TCG_TARGET_HAS_nor_i64;
    case INDEX_op_clz_i64:
        return TCG_TARGET_HAS_clz_i64;
    case INDEX_op_ctz_i64:
        return TCG_TARGET_HAS_ctz_i64;
    case INDEX_op_ctpop_i64:
        return TCG_TARGET_HAS_ctpop_i64;
    case INDEX_op_add2_i64:
        return TCG_TARGET_HAS_add2_i64;
    case INDEX_op_sub2_i64:
        return TCG_TARGET_HAS_sub2_i64;
    case INDEX_op_mulu2_i64:
        return TCG_TARGET_HAS_mulu2_i64;
    case INDEX_op_muls2_i64:
        return TCG_TARGET_HAS_muls2_i64;
    case INDEX_op_muluh_i64:
        return TCG_TARGET_HAS_muluh_i64;
    case INDEX_op_mulsh_i64:
        return TCG_TARGET_HAS_mulsh_i64;

    case INDEX_op_mov_vec:
    case INDEX_op_dup_vec:
    case INDEX_op_dupm_vec:
    case INDEX_op_ld_vec:
    case INDEX_op_st_vec:
    case INDEX_op_add_vec:
    case INDEX_op_sub_vec:
    case INDEX_op_and_vec:
    case INDEX_op_or_vec:
    case INDEX_op_xor_vec:
    case INDEX_op_cmp_vec:
        return have_vec;
    case INDEX_op_dup2_vec:
        return have_vec && TCG_TARGET_REG_BITS == 32;
    case INDEX_op_not_vec:
        return have_vec && TCG_TARGET_HAS_not_vec;
    case INDEX_op_neg_vec:
        return have_vec && TCG_TARGET_HAS_neg_vec;
    case INDEX_op_abs_vec:
        return have_vec && TCG_TARGET_HAS_abs_vec;
    case INDEX_op_andc_vec:
        return have_vec && TCG_TARGET_HAS_andc_vec;
    case INDEX_op_orc_vec:
        return have_vec && TCG_TARGET_HAS_orc_vec;
    case INDEX_op_nand_vec:
        return have_vec && TCG_TARGET_HAS_nand_vec;
    case INDEX_op_nor_vec:
        return have_vec && TCG_TARGET_HAS_nor_vec;
    case INDEX_op_eqv_vec:
        return have_vec && TCG_TARGET_HAS_eqv_vec;
    case INDEX_op_mul_vec:
        return have_vec && TCG_TARGET_HAS_mul_vec;
    case INDEX_op_shli_vec:
    case INDEX_op_shri_vec:
    case INDEX_op_sari_vec:
        return have_vec && TCG_TARGET_HAS_shi_vec;
    case INDEX_op_shls_vec:
    case INDEX_op_shrs_vec:
    case INDEX_op_sars_vec:
        return have_vec && TCG_TARGET_HAS_shs_vec;
    case INDEX_op_shlv_vec:
    case INDEX_op_shrv_vec:
    case INDEX_op_sarv_vec:
        return have_vec && TCG_TARGET_HAS_shv_vec;
    case INDEX_op_rotli_vec:
        return have_vec && TCG_TARGET_HAS_roti_vec;
    case INDEX_op_rotls_vec:
        return have_vec && TCG_TARGET_HAS_rots_vec;
    case INDEX_op_rotlv_vec:
    case INDEX_op_rotrv_vec:
        return have_vec && TCG_TARGET_HAS_rotv_vec;
    case INDEX_op_ssadd_vec:
    case INDEX_op_usadd_vec:
    case INDEX_op_sssub_vec:
    case INDEX_op_ussub_vec:
        return have_vec && TCG_TARGET_HAS_sat_vec;
    case INDEX_op_smin_vec:
    case INDEX_op_umin_vec:
    case INDEX_op_smax_vec:
    case INDEX_op_umax_vec:
        return have_vec && TCG_TARGET_HAS_minmax_vec;
    case INDEX_op_bitsel_vec:
        return have_vec && TCG_TARGET_HAS_bitsel_vec;
    case INDEX_op_cmpsel_vec:
        return have_vec && TCG_TARGET_HAS_cmpsel_vec;

    default:
        tcg_debug_assert(op > INDEX_op_last_generic && op < NB_OPS);
        return true;
    }
}

/* Note: we convert the 64 bit args to 32 bit and do some alignment
   and endian swap. Maybe it would be better to do the alignment
   and endian swap in tcg_reg_alloc_call(). */
void tcg_gen_callN(void *func, TCGTemp *ret, int nargs, TCGTemp **args)
{
    int i, real_args, nb_rets, pi;
    unsigned typemask;
    const TCGHelperInfo *info;
    TCGOp *op;

    info = g_hash_table_lookup(helper_table, (gpointer)func);
    typemask = info->typemask;

#ifdef CONFIG_PLUGIN
    /* detect non-plugin helpers */
    if (tcg_ctx->plugin_insn && unlikely(strncmp(info->name, "plugin_", 7))) {
        tcg_ctx->plugin_insn->calls_helpers = true;
    }
#endif

#if defined(__sparc__) && !defined(__arch64__) \
    && !defined(CONFIG_TCG_INTERPRETER)
    /* We have 64-bit values in one register, but need to pass as two
       separate parameters.  Split them.  */
    int orig_typemask = typemask;
    int orig_nargs = nargs;
    TCGv_i64 retl, reth;
    TCGTemp *split_args[MAX_OPC_PARAM];

    retl = NULL;
    reth = NULL;
    typemask = 0;
    for (i = real_args = 0; i < nargs; ++i) {
        int argtype = extract32(orig_typemask, (i + 1) * 3, 3);
        bool is_64bit = (argtype & ~1) == dh_typecode_i64;

        if (is_64bit) {
            TCGv_i64 orig = temp_tcgv_i64(args[i]);
            TCGv_i32 h = tcg_temp_new_i32();
            TCGv_i32 l = tcg_temp_new_i32();
            tcg_gen_extr_i64_i32(l, h, orig);
            split_args[real_args++] = tcgv_i32_temp(h);
            typemask |= dh_typecode_i32 << (real_args * 3);
            split_args[real_args++] = tcgv_i32_temp(l);
            typemask |= dh_typecode_i32 << (real_args * 3);
        } else {
            split_args[real_args++] = args[i];
            typemask |= argtype << (real_args * 3);
        }
    }
    nargs = real_args;
    args = split_args;
#elif defined(TCG_TARGET_EXTEND_ARGS) && TCG_TARGET_REG_BITS == 64
    for (i = 0; i < nargs; ++i) {
        int argtype = extract32(typemask, (i + 1) * 3, 3);
        bool is_32bit = (argtype & ~1) == dh_typecode_i32;
        bool is_signed = argtype & 1;

        if (is_32bit) {
            TCGv_i64 temp = tcg_temp_new_i64();
            TCGv_i32 orig = temp_tcgv_i32(args[i]);
            if (is_signed) {
                tcg_gen_ext_i32_i64(temp, orig);
            } else {
                tcg_gen_extu_i32_i64(temp, orig);
            }
            args[i] = tcgv_i64_temp(temp);
        }
    }
#endif /* TCG_TARGET_EXTEND_ARGS */

    op = tcg_emit_op(INDEX_op_call);

    pi = 0;
    if (ret != NULL) {
#if defined(__sparc__) && !defined(__arch64__) \
    && !defined(CONFIG_TCG_INTERPRETER)
        if ((typemask & 6) == dh_typecode_i64) {
            /* The 32-bit ABI is going to return the 64-bit value in
               the %o0/%o1 register pair.  Prepare for this by using
               two return temporaries, and reassemble below.  */
            retl = tcg_temp_new_i64();
            reth = tcg_temp_new_i64();
            op->args[pi++] = tcgv_i64_arg(reth);
            op->args[pi++] = tcgv_i64_arg(retl);
            nb_rets = 2;
        } else {
            op->args[pi++] = temp_arg(ret);
            nb_rets = 1;
        }
#else
        if (TCG_TARGET_REG_BITS < 64 && (typemask & 6) == dh_typecode_i64) {
#if HOST_BIG_ENDIAN
            op->args[pi++] = temp_arg(ret + 1);
            op->args[pi++] = temp_arg(ret);
#else
            op->args[pi++] = temp_arg(ret);
            op->args[pi++] = temp_arg(ret + 1);
#endif
            nb_rets = 2;
        } else {
            op->args[pi++] = temp_arg(ret);
            nb_rets = 1;
        }
#endif
    } else {
        nb_rets = 0;
    }
    TCGOP_CALLO(op) = nb_rets;

    real_args = 0;
    for (i = 0; i < nargs; i++) {
        int argtype = extract32(typemask, (i + 1) * 3, 3);
        bool is_64bit = (argtype & ~1) == dh_typecode_i64;
        bool want_align = false;

#if defined(CONFIG_TCG_INTERPRETER)
        /*
         * Align all arguments, so that they land in predictable places
         * for passing off to ffi_call.
         */
        want_align = true;
#elif defined(TCG_TARGET_CALL_ALIGN_ARGS)
        /* Some targets want aligned 64 bit args */
        want_align = is_64bit;
#endif

        if (TCG_TARGET_REG_BITS < 64 && want_align && (real_args & 1)) {
            op->args[pi++] = TCG_CALL_DUMMY_ARG;
            real_args++;
        }

        if (TCG_TARGET_REG_BITS < 64 && is_64bit) {
            /*
             * If stack grows up, then we will be placing successive
             * arguments at lower addresses, which means we need to
             * reverse the order compared to how we would normally
             * treat either big or little-endian.  For those arguments
             * that will wind up in registers, this still works for
             * HPPA (the only current STACK_GROWSUP target) since the
             * argument registers are *also* allocated in decreasing
             * order.  If another such target is added, this logic may
             * have to get more complicated to differentiate between
             * stack arguments and register arguments.
             */
#if HOST_BIG_ENDIAN != defined(TCG_TARGET_STACK_GROWSUP)
            op->args[pi++] = temp_arg(args[i] + 1);
            op->args[pi++] = temp_arg(args[i]);
#else
            op->args[pi++] = temp_arg(args[i]);
            op->args[pi++] = temp_arg(args[i] + 1);
#endif
            real_args += 2;
            continue;
        }

        op->args[pi++] = temp_arg(args[i]);
        real_args++;
    }
    op->args[pi++] = (uintptr_t)func;
    op->args[pi++] = (uintptr_t)info;
    TCGOP_CALLI(op) = real_args;

    /* Make sure the fields didn't overflow.  */
    tcg_debug_assert(TCGOP_CALLI(op) == real_args);
    tcg_debug_assert(pi <= ARRAY_SIZE(op->args));

#if defined(__sparc__) && !defined(__arch64__) \
    && !defined(CONFIG_TCG_INTERPRETER)
    /* Free all of the parts we allocated above.  */
    for (i = real_args = 0; i < orig_nargs; ++i) {
        int argtype = extract32(orig_typemask, (i + 1) * 3, 3);
        bool is_64bit = (argtype & ~1) == dh_typecode_i64;

        if (is_64bit) {
            tcg_temp_free_internal(args[real_args++]);
            tcg_temp_free_internal(args[real_args++]);
        } else {
            real_args++;
        }
    }
    if ((orig_typemask & 6) == dh_typecode_i64) {
        /* The 32-bit ABI returned two 32-bit pieces.  Re-assemble them.
           Note that describing these as TCGv_i64 eliminates an unnecessary
           zero-extension that tcg_gen_concat_i32_i64 would create.  */
        tcg_gen_concat32_i64(temp_tcgv_i64(ret), retl, reth);
        tcg_temp_free_i64(retl);
        tcg_temp_free_i64(reth);
    }
#elif defined(TCG_TARGET_EXTEND_ARGS) && TCG_TARGET_REG_BITS == 64
    for (i = 0; i < nargs; ++i) {
        int argtype = extract32(typemask, (i + 1) * 3, 3);
        bool is_32bit = (argtype & ~1) == dh_typecode_i32;

        if (is_32bit) {
            tcg_temp_free_internal(args[i]);
        }
    }
#endif /* TCG_TARGET_EXTEND_ARGS */
}

static void tcg_reg_alloc_start(TCGContext *s)
{
    int i, n;

    for (i = 0, n = s->nb_temps; i < n; i++) {
        TCGTemp *ts = &s->temps[i];
        TCGTempVal val = TEMP_VAL_MEM;

        switch (ts->kind) {
        case TEMP_CONST:
            val = TEMP_VAL_CONST;
            break;
        case TEMP_FIXED:
            val = TEMP_VAL_REG;
            break;
        case TEMP_GLOBAL:
            break;
        case TEMP_NORMAL:
        case TEMP_EBB:
            val = TEMP_VAL_DEAD;
            /* fall through */
        case TEMP_LOCAL:
            ts->mem_allocated = 0;
            break;
        default:
            g_assert_not_reached();
        }
        ts->val_type = val;
    }

    memset(s->reg_to_temp, 0, sizeof(s->reg_to_temp));
}

static char *tcg_get_arg_str_ptr(TCGContext *s, char *buf, int buf_size,
                                 TCGTemp *ts)
{
    int idx = temp_idx(ts);

    switch (ts->kind) {
    case TEMP_FIXED:
    case TEMP_GLOBAL:
        pstrcpy(buf, buf_size, ts->name);
        break;
    case TEMP_LOCAL:
        snprintf(buf, buf_size, "loc%d", idx - s->nb_globals);
        break;
    case TEMP_EBB:
        snprintf(buf, buf_size, "ebb%d", idx - s->nb_globals);
        break;
    case TEMP_NORMAL:
        snprintf(buf, buf_size, "tmp%d", idx - s->nb_globals);
        break;
    case TEMP_CONST:
        switch (ts->type) {
        case TCG_TYPE_I32:
            snprintf(buf, buf_size, "$0x%x", (int32_t)ts->val);
            break;
#if TCG_TARGET_REG_BITS > 32
        case TCG_TYPE_I64:
            snprintf(buf, buf_size, "$0x%" PRIx64, ts->val);
            break;
#endif
        case TCG_TYPE_V64:
        case TCG_TYPE_V128:
        case TCG_TYPE_V256:
            snprintf(buf, buf_size, "v%d$0x%" PRIx64,
                     64 << (ts->type - TCG_TYPE_V64), ts->val);
            break;
        default:
            g_assert_not_reached();
        }
        break;
    }
    return buf;
}

static char *tcg_get_arg_str(TCGContext *s, char *buf,
                             int buf_size, TCGArg arg)
{
    return tcg_get_arg_str_ptr(s, buf, buf_size, arg_temp(arg));
}

static const char * const cond_name[] =
{
    [TCG_COND_NEVER] = "never",
    [TCG_COND_ALWAYS] = "always",
    [TCG_COND_EQ] = "eq",
    [TCG_COND_NE] = "ne",
    [TCG_COND_LT] = "lt",
    [TCG_COND_GE] = "ge",
    [TCG_COND_LE] = "le",
    [TCG_COND_GT] = "gt",
    [TCG_COND_LTU] = "ltu",
    [TCG_COND_GEU] = "geu",
    [TCG_COND_LEU] = "leu",
    [TCG_COND_GTU] = "gtu"
};

static const char * const ldst_name[] =
{
    [MO_UB]   = "ub",
    [MO_SB]   = "sb",
    [MO_LEUW] = "leuw",
    [MO_LESW] = "lesw",
    [MO_LEUL] = "leul",
    [MO_LESL] = "lesl",
    [MO_LEUQ] = "leq",
    [MO_BEUW] = "beuw",
    [MO_BESW] = "besw",
    [MO_BEUL] = "beul",
    [MO_BESL] = "besl",
    [MO_BEUQ] = "beq",
};

static const char * const alignment_name[(MO_AMASK >> MO_ASHIFT) + 1] = {
#ifdef TARGET_ALIGNED_ONLY
    [MO_UNALN >> MO_ASHIFT]    = "un+",
    [MO_ALIGN >> MO_ASHIFT]    = "",
#else
    [MO_UNALN >> MO_ASHIFT]    = "",
    [MO_ALIGN >> MO_ASHIFT]    = "al+",
#endif
    [MO_ALIGN_2 >> MO_ASHIFT]  = "al2+",
    [MO_ALIGN_4 >> MO_ASHIFT]  = "al4+",
    [MO_ALIGN_8 >> MO_ASHIFT]  = "al8+",
    [MO_ALIGN_16 >> MO_ASHIFT] = "al16+",
    [MO_ALIGN_32 >> MO_ASHIFT] = "al32+",
    [MO_ALIGN_64 >> MO_ASHIFT] = "al64+",
};

static const char bswap_flag_name[][6] = {
    [TCG_BSWAP_IZ] = "iz",
    [TCG_BSWAP_OZ] = "oz",
    [TCG_BSWAP_OS] = "os",
    [TCG_BSWAP_IZ | TCG_BSWAP_OZ] = "iz,oz",
    [TCG_BSWAP_IZ | TCG_BSWAP_OS] = "iz,os",
};

static inline bool tcg_regset_single(TCGRegSet d)
{
    return (d & (d - 1)) == 0;
}

static inline TCGReg tcg_regset_first(TCGRegSet d)
{
    if (TCG_TARGET_NB_REGS <= 32) {
        return ctz32(d);
    } else {
        return ctz64(d);
    }
}

/* Return only the number of characters output -- no error return. */
#define ne_fprintf(...) \
    ({ int ret_ = fprintf(__VA_ARGS__); ret_ >= 0 ? ret_ : 0; })

static void tcg_dump_ops(TCGContext *s, FILE *f, bool have_prefs)
{
    char buf[128];
    TCGOp *op;

    QTAILQ_FOREACH(op, &s->ops, link) {
        int i, k, nb_oargs, nb_iargs, nb_cargs;
        const TCGOpDef *def;
        TCGOpcode c;
        int col = 0;

        c = op->opc;
        def = &tcg_op_defs[c];

        if (c == INDEX_op_insn_start) {
            nb_oargs = 0;
            col += ne_fprintf(f, "\n ----");

            for (i = 0; i < TARGET_INSN_START_WORDS; ++i) {
                target_ulong a;
#if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
                a = deposit64(op->args[i * 2], 32, 32, op->args[i * 2 + 1]);
#else
                a = op->args[i];
#endif
                col += ne_fprintf(f, " " TARGET_FMT_lx, a);
            }
        } else if (c == INDEX_op_call) {
            const TCGHelperInfo *info = tcg_call_info(op);
            void *func = tcg_call_func(op);

            /* variable number of arguments */
            nb_oargs = TCGOP_CALLO(op);
            nb_iargs = TCGOP_CALLI(op);
            nb_cargs = def->nb_cargs;

            col += ne_fprintf(f, " %s ", def->name);

            /*
             * Print the function name from TCGHelperInfo, if available.
             * Note that plugins have a template function for the info,
             * but the actual function pointer comes from the plugin.
             */
            if (func == info->func) {
                col += ne_fprintf(f, "%s", info->name);
            } else {
                col += ne_fprintf(f, "plugin(%p)", func);
            }

            col += ne_fprintf(f, ",$0x%x,$%d", info->flags, nb_oargs);
            for (i = 0; i < nb_oargs; i++) {
                col += ne_fprintf(f, ",%s", tcg_get_arg_str(s, buf, sizeof(buf),
                                                            op->args[i]));
            }
            for (i = 0; i < nb_iargs; i++) {
                TCGArg arg = op->args[nb_oargs + i];
                const char *t = "<dummy>";
                if (arg != TCG_CALL_DUMMY_ARG) {
                    t = tcg_get_arg_str(s, buf, sizeof(buf), arg);
                }
                col += ne_fprintf(f, ",%s", t);
            }
        } else {
            col += ne_fprintf(f, " %s ", def->name);

            nb_oargs = def->nb_oargs;
            nb_iargs = def->nb_iargs;
            nb_cargs = def->nb_cargs;

            if (def->flags & TCG_OPF_VECTOR) {
                col += ne_fprintf(f, "v%d,e%d,", 64 << TCGOP_VECL(op),
                                  8 << TCGOP_VECE(op));
            }

            k = 0;
            for (i = 0; i < nb_oargs; i++) {
                const char *sep =  k ? "," : "";
                col += ne_fprintf(f, "%s%s", sep,
                                  tcg_get_arg_str(s, buf, sizeof(buf),
                                                  op->args[k++]));
            }
            for (i = 0; i < nb_iargs; i++) {
                const char *sep =  k ? "," : "";
                col += ne_fprintf(f, "%s%s", sep,
                                  tcg_get_arg_str(s, buf, sizeof(buf),
                                                  op->args[k++]));
            }
            switch (c) {
            case INDEX_op_brcond_i32:
            case INDEX_op_setcond_i32:
            case INDEX_op_movcond_i32:
            case INDEX_op_brcond2_i32:
            case INDEX_op_setcond2_i32:
            case INDEX_op_brcond_i64:
            case INDEX_op_setcond_i64:
            case INDEX_op_movcond_i64:
            case INDEX_op_cmp_vec:
            case INDEX_op_cmpsel_vec:
                if (op->args[k] < ARRAY_SIZE(cond_name)
                    && cond_name[op->args[k]]) {
                    col += ne_fprintf(f, ",%s", cond_name[op->args[k++]]);
                } else {
                    col += ne_fprintf(f, ",$0x%" TCG_PRIlx, op->args[k++]);
                }
                i = 1;
                break;
            case INDEX_op_qemu_ld_i32:
            case INDEX_op_qemu_st_i32:
            case INDEX_op_qemu_st8_i32:
            case INDEX_op_qemu_ld_i64:
            case INDEX_op_qemu_st_i64:
                {
                    MemOpIdx oi = op->args[k++];
                    MemOp op = get_memop(oi);
                    unsigned ix = get_mmuidx(oi);

                    if (op & ~(MO_AMASK | MO_BSWAP | MO_SSIZE)) {
                        col += ne_fprintf(f, ",$0x%x,%u", op, ix);
                    } else {
                        const char *s_al, *s_op;
                        s_al = alignment_name[(op & MO_AMASK) >> MO_ASHIFT];
                        s_op = ldst_name[op & (MO_BSWAP | MO_SSIZE)];
                        col += ne_fprintf(f, ",%s%s,%u", s_al, s_op, ix);
                    }
                    i = 1;
                }
                break;
            case INDEX_op_bswap16_i32:
            case INDEX_op_bswap16_i64:
            case INDEX_op_bswap32_i32:
            case INDEX_op_bswap32_i64:
            case INDEX_op_bswap64_i64:
                {
                    TCGArg flags = op->args[k];
                    const char *name = NULL;

                    if (flags < ARRAY_SIZE(bswap_flag_name)) {
                        name = bswap_flag_name[flags];
                    }
                    if (name) {
                        col += ne_fprintf(f, ",%s", name);
                    } else {
                        col += ne_fprintf(f, ",$0x%" TCG_PRIlx, flags);
                    }
                    i = k = 1;
                }
                break;
            default:
                i = 0;
                break;
            }
            switch (c) {
            case INDEX_op_set_label:
            case INDEX_op_br:
            case INDEX_op_brcond_i32:
            case INDEX_op_brcond_i64:
            case INDEX_op_brcond2_i32:
                col += ne_fprintf(f, "%s$L%d", k ? "," : "",
                                  arg_label(op->args[k])->id);
                i++, k++;
                break;
            default:
                break;
            }
            for (; i < nb_cargs; i++, k++) {
                col += ne_fprintf(f, "%s$0x%" TCG_PRIlx, k ? "," : "",
                                  op->args[k]);
            }
        }

        if (have_prefs || op->life) {
            for (; col < 40; ++col) {
                putc(' ', f);
            }

        }

        if (op->life) {
            unsigned life = op->life;

            if (life & (SYNC_ARG * 3)) {
                ne_fprintf(f, "  sync:");
                for (i = 0; i < 2; ++i) {
                    if (life & (SYNC_ARG << i)) {
                        ne_fprintf(f, " %d", i);
                    }
                }
            }
            life /= DEAD_ARG;
            if (life) {
                ne_fprintf(f, "  dead:");
                for (i = 0; life; ++i, life >>= 1) {
                    if (life & 1) {
                        ne_fprintf(f, " %d", i);
                    }
                }
            }
        }

        if (have_prefs) {
            for (i = 0; i < nb_oargs; ++i) {
                TCGRegSet set = op->output_pref[i];

                if (i == 0) {
                    ne_fprintf(f, "  pref=");
                } else {
                    ne_fprintf(f, ",");
                }
                if (set == 0) {
                    ne_fprintf(f, "none");
                } else if (set == MAKE_64BIT_MASK(0, TCG_TARGET_NB_REGS)) {
                    ne_fprintf(f, "all");
#ifdef CONFIG_DEBUG_TCG
                } else if (tcg_regset_single(set)) {
                    TCGReg reg = tcg_regset_first(set);
                    ne_fprintf(f, "%s", tcg_target_reg_names[reg]);
#endif
                } else if (TCG_TARGET_NB_REGS <= 32) {
                    ne_fprintf(f, "0x%x", (uint32_t)set);
                } else {
                    ne_fprintf(f, "0x%" PRIx64, (uint64_t)set);
                }
            }
        }

        putc('\n', f);
    }
}

/* we give more priority to constraints with less registers */
static int get_constraint_priority(const TCGOpDef *def, int k)
{
    const TCGArgConstraint *arg_ct = &def->args_ct[k];
    int n;

    if (arg_ct->oalias) {
        /* an alias is equivalent to a single register */
        n = 1;
    } else {
        n = ctpop64(arg_ct->regs);
    }
    return TCG_TARGET_NB_REGS - n + 1;
}

/* sort from highest priority to lowest */
static void sort_constraints(TCGOpDef *def, int start, int n)
{
    int i, j;
    TCGArgConstraint *a = def->args_ct;

    for (i = 0; i < n; i++) {
        a[start + i].sort_index = start + i;
    }
    if (n <= 1) {
        return;
    }
    for (i = 0; i < n - 1; i++) {
        for (j = i + 1; j < n; j++) {
            int p1 = get_constraint_priority(def, a[start + i].sort_index);
            int p2 = get_constraint_priority(def, a[start + j].sort_index);
            if (p1 < p2) {
                int tmp = a[start + i].sort_index;
                a[start + i].sort_index = a[start + j].sort_index;
                a[start + j].sort_index = tmp;
            }
        }
    }
}

static void process_op_defs(TCGContext *s)
{
    TCGOpcode op;

    for (op = 0; op < NB_OPS; op++) {
        TCGOpDef *def = &tcg_op_defs[op];
        const TCGTargetOpDef *tdefs;
        int i, nb_args;

        if (def->flags & TCG_OPF_NOT_PRESENT) {
            continue;
        }

        nb_args = def->nb_iargs + def->nb_oargs;
        if (nb_args == 0) {
            continue;
        }

        /*
         * Macro magic should make it impossible, but double-check that
         * the array index is in range.  Since the signness of an enum
         * is implementation defined, force the result to unsigned.
         */
        unsigned con_set = tcg_target_op_def(op);
        tcg_debug_assert(con_set < ARRAY_SIZE(constraint_sets));
        tdefs = &constraint_sets[con_set];

        for (i = 0; i < nb_args; i++) {
            const char *ct_str = tdefs->args_ct_str[i];
            /* Incomplete TCGTargetOpDef entry. */
            tcg_debug_assert(ct_str != NULL);

            while (*ct_str != '\0') {
                switch(*ct_str) {
                case '0' ... '9':
                    {
                        int oarg = *ct_str - '0';
                        tcg_debug_assert(ct_str == tdefs->args_ct_str[i]);
                        tcg_debug_assert(oarg < def->nb_oargs);
                        tcg_debug_assert(def->args_ct[oarg].regs != 0);
                        def->args_ct[i] = def->args_ct[oarg];
                        /* The output sets oalias.  */
                        def->args_ct[oarg].oalias = true;
                        def->args_ct[oarg].alias_index = i;
                        /* The input sets ialias. */
                        def->args_ct[i].ialias = true;
                        def->args_ct[i].alias_index = oarg;
                    }
                    ct_str++;
                    break;
                case '&':
                    def->args_ct[i].newreg = true;
                    ct_str++;
                    break;
                case 'i':
                    def->args_ct[i].ct |= TCG_CT_CONST;
                    ct_str++;
                    break;

                /* Include all of the target-specific constraints. */

#undef CONST
#define CONST(CASE, MASK) \
    case CASE: def->args_ct[i].ct |= MASK; ct_str++; break;
#define REGS(CASE, MASK) \
    case CASE: def->args_ct[i].regs |= MASK; ct_str++; break;

#include "tcg-target-con-str.h"

#undef REGS
#undef CONST
                default:
                    /* Typo in TCGTargetOpDef constraint. */
                    g_assert_not_reached();
                }
            }
        }

        /* TCGTargetOpDef entry with too much information? */
        tcg_debug_assert(i == TCG_MAX_OP_ARGS || tdefs->args_ct_str[i] == NULL);

        /* sort the constraints (XXX: this is just an heuristic) */
        sort_constraints(def, 0, def->nb_oargs);
        sort_constraints(def, def->nb_oargs, def->nb_iargs);
    }
}

void tcg_op_remove(TCGContext *s, TCGOp *op)
{
    TCGLabel *label;

    switch (op->opc) {
    case INDEX_op_br:
        label = arg_label(op->args[0]);
        label->refs--;
        break;
    case INDEX_op_brcond_i32:
    case INDEX_op_brcond_i64:
        label = arg_label(op->args[3]);
        label->refs--;
        break;
    case INDEX_op_brcond2_i32:
        label = arg_label(op->args[5]);
        label->refs--;
        break;
    default:
        break;
    }

    QTAILQ_REMOVE(&s->ops, op, link);
    QTAILQ_INSERT_TAIL(&s->free_ops, op, link);
    s->nb_ops--;

#ifdef CONFIG_PROFILER
    qatomic_set(&s->prof.del_op_count, s->prof.del_op_count + 1);
#endif
}

void tcg_remove_ops_after(TCGOp *op)
{
    TCGContext *s = tcg_ctx;

    while (true) {
        TCGOp *last = tcg_last_op();
        if (last == op) {
            return;
        }
        tcg_op_remove(s, last);
    }
}

static TCGOp *tcg_op_alloc(TCGOpcode opc)
{
    TCGContext *s = tcg_ctx;
    TCGOp *op;

    if (likely(QTAILQ_EMPTY(&s->free_ops))) {
        op = tcg_malloc(sizeof(TCGOp));
    } else {
        op = QTAILQ_FIRST(&s->free_ops);
        QTAILQ_REMOVE(&s->free_ops, op, link);
    }
    memset(op, 0, offsetof(TCGOp, link));
    op->opc = opc;
    s->nb_ops++;

    return op;
}

TCGOp *tcg_emit_op(TCGOpcode opc)
{
    TCGOp *op = tcg_op_alloc(opc);
    QTAILQ_INSERT_TAIL(&tcg_ctx->ops, op, link);
    return op;
}

TCGOp *tcg_op_insert_before(TCGContext *s, TCGOp *old_op, TCGOpcode opc)
{
    TCGOp *new_op = tcg_op_alloc(opc);
    QTAILQ_INSERT_BEFORE(old_op, new_op, link);
    return new_op;
}

TCGOp *tcg_op_insert_after(TCGContext *s, TCGOp *old_op, TCGOpcode opc)
{
    TCGOp *new_op = tcg_op_alloc(opc);
    QTAILQ_INSERT_AFTER(&s->ops, old_op, new_op, link);
    return new_op;
}

/* Reachable analysis : remove unreachable code.  */
static void reachable_code_pass(TCGContext *s)
{
    TCGOp *op, *op_next;
    bool dead = false;

    QTAILQ_FOREACH_SAFE(op, &s->ops, link, op_next) {
        bool remove = dead;
        TCGLabel *label;

        switch (op->opc) {
        case INDEX_op_set_label:
            label = arg_label(op->args[0]);
            if (label->refs == 0) {
                /*
                 * While there is an occasional backward branch, virtually
                 * all branches generated by the translators are forward.
                 * Which means that generally we will have already removed
                 * all references to the label that will be, and there is
                 * little to be gained by iterating.
                 */
                remove = true;
            } else {
                /* Once we see a label, insns become live again.  */
                dead = false;
                remove = false;

                /*
                 * Optimization can fold conditional branches to unconditional.
                 * If we find a label with one reference which is preceded by
                 * an unconditional branch to it, remove both.  This needed to
                 * wait until the dead code in between them was removed.
                 */
                if (label->refs == 1) {
                    TCGOp *op_prev = QTAILQ_PREV(op, link);
                    if (op_prev->opc == INDEX_op_br &&
                        label == arg_label(op_prev->args[0])) {
                        tcg_op_remove(s, op_prev);
                        remove = true;
                    }
                }
            }
            break;

        case INDEX_op_br:
        case INDEX_op_exit_tb:
        case INDEX_op_goto_ptr:
            /* Unconditional branches; everything following is dead.  */
            dead = true;
            break;

        case INDEX_op_call:
            /* Notice noreturn helper calls, raising exceptions.  */
            if (tcg_call_flags(op) & TCG_CALL_NO_RETURN) {
                dead = true;
            }
            break;

        case INDEX_op_insn_start:
            /* Never remove -- we need to keep these for unwind.  */
            remove = false;
            break;

        default:
            break;
        }

        if (remove) {
            tcg_op_remove(s, op);
        }
    }
}

#define TS_DEAD  1
#define TS_MEM   2

#define IS_DEAD_ARG(n)   (arg_life & (DEAD_ARG << (n)))
#define NEED_SYNC_ARG(n) (arg_life & (SYNC_ARG << (n)))

/* For liveness_pass_1, the register preferences for a given temp.  */
static inline TCGRegSet *la_temp_pref(TCGTemp *ts)
{
    return ts->state_ptr;
}

/* For liveness_pass_1, reset the preferences for a given temp to the
 * maximal regset for its type.
 */
static inline void la_reset_pref(TCGTemp *ts)
{
    *la_temp_pref(ts)
        = (ts->state == TS_DEAD ? 0 : tcg_target_available_regs[ts->type]);
}

/* liveness analysis: end of function: all temps are dead, and globals
   should be in memory. */
static void la_func_end(TCGContext *s, int ng, int nt)
{
    int i;

    for (i = 0; i < ng; ++i) {
        s->temps[i].state = TS_DEAD | TS_MEM;
        la_reset_pref(&s->temps[i]);
    }
    for (i = ng; i < nt; ++i) {
        s->temps[i].state = TS_DEAD;
        la_reset_pref(&s->temps[i]);
    }
}

/* liveness analysis: end of basic block: all temps are dead, globals
   and local temps should be in memory. */
static void la_bb_end(TCGContext *s, int ng, int nt)
{
    int i;

    for (i = 0; i < nt; ++i) {
        TCGTemp *ts = &s->temps[i];
        int state;

        switch (ts->kind) {
        case TEMP_FIXED:
        case TEMP_GLOBAL:
        case TEMP_LOCAL:
            state = TS_DEAD | TS_MEM;
            break;
        case TEMP_NORMAL:
        case TEMP_EBB:
        case TEMP_CONST:
            state = TS_DEAD;
            break;
        default:
            g_assert_not_reached();
        }
        ts->state = state;
        la_reset_pref(ts);
    }
}

/* liveness analysis: sync globals back to memory.  */
static void la_global_sync(TCGContext *s, int ng)
{
    int i;

    for (i = 0; i < ng; ++i) {
        int state = s->temps[i].state;
        s->temps[i].state = state | TS_MEM;
        if (state == TS_DEAD) {
            /* If the global was previously dead, reset prefs.  */
            la_reset_pref(&s->temps[i]);
        }
    }
}

/*
 * liveness analysis: conditional branch: all temps are dead unless
 * explicitly live-across-conditional-branch, globals and local temps
 * should be synced.
 */
static void la_bb_sync(TCGContext *s, int ng, int nt)
{
    la_global_sync(s, ng);

    for (int i = ng; i < nt; ++i) {
        TCGTemp *ts = &s->temps[i];
        int state;

        switch (ts->kind) {
        case TEMP_LOCAL:
            state = ts->state;
            ts->state = state | TS_MEM;
            if (state != TS_DEAD) {
                continue;
            }
            break;
        case TEMP_NORMAL:
            s->temps[i].state = TS_DEAD;
            break;
        case TEMP_EBB:
        case TEMP_CONST:
            continue;
        default:
            g_assert_not_reached();
        }
        la_reset_pref(&s->temps[i]);
    }
}

/* liveness analysis: sync globals back to memory and kill.  */
static void la_global_kill(TCGContext *s, int ng)
{
    int i;

    for (i = 0; i < ng; i++) {
        s->temps[i].state = TS_DEAD | TS_MEM;
        la_reset_pref(&s->temps[i]);
    }
}

/* liveness analysis: note live globals crossing calls.  */
static void la_cross_call(TCGContext *s, int nt)
{
    TCGRegSet mask = ~tcg_target_call_clobber_regs;
    int i;

    for (i = 0; i < nt; i++) {
        TCGTemp *ts = &s->temps[i];
        if (!(ts->state & TS_DEAD)) {
            TCGRegSet *pset = la_temp_pref(ts);
            TCGRegSet set = *pset;

            set &= mask;
            /* If the combination is not possible, restart.  */
            if (set == 0) {
                set = tcg_target_available_regs[ts->type] & mask;
            }
            *pset = set;
        }
    }
}

/* Liveness analysis : update the opc_arg_life array to tell if a
   given input arguments is dead. Instructions updating dead
   temporaries are removed. */
static void liveness_pass_1(TCGContext *s)
{
    int nb_globals = s->nb_globals;
    int nb_temps = s->nb_temps;
    TCGOp *op, *op_prev;
    TCGRegSet *prefs;
    int i;

    prefs = tcg_malloc(sizeof(TCGRegSet) * nb_temps);
    for (i = 0; i < nb_temps; ++i) {
        s->temps[i].state_ptr = prefs + i;
    }

    /* ??? Should be redundant with the exit_tb that ends the TB.  */
    la_func_end(s, nb_globals, nb_temps);

    QTAILQ_FOREACH_REVERSE_SAFE(op, &s->ops, link, op_prev) {
        int nb_iargs, nb_oargs;
        TCGOpcode opc_new, opc_new2;
        bool have_opc_new2;
        TCGLifeData arg_life = 0;
        TCGTemp *ts;
        TCGOpcode opc = op->opc;
        const TCGOpDef *def = &tcg_op_defs[opc];

        switch (opc) {
        case INDEX_op_call:
            {
                int call_flags;
                int nb_call_regs;

                nb_oargs = TCGOP_CALLO(op);
                nb_iargs = TCGOP_CALLI(op);
                call_flags = tcg_call_flags(op);

                /* pure functions can be removed if their result is unused */
                if (call_flags & TCG_CALL_NO_SIDE_EFFECTS) {
                    for (i = 0; i < nb_oargs; i++) {
                        ts = arg_temp(op->args[i]);
                        if (ts->state != TS_DEAD) {
                            goto do_not_remove_call;
                        }
                    }
                    goto do_remove;
                }
            do_not_remove_call:

                /* Output args are dead.  */
                for (i = 0; i < nb_oargs; i++) {
                    ts = arg_temp(op->args[i]);
                    if (ts->state & TS_DEAD) {
                        arg_life |= DEAD_ARG << i;
                    }
                    if (ts->state & TS_MEM) {
                        arg_life |= SYNC_ARG << i;
                    }
                    ts->state = TS_DEAD;
                    la_reset_pref(ts);

                    /* Not used -- it will be tcg_target_call_oarg_regs[i].  */
                    op->output_pref[i] = 0;
                }

                if (!(call_flags & (TCG_CALL_NO_WRITE_GLOBALS |
                                    TCG_CALL_NO_READ_GLOBALS))) {
                    la_global_kill(s, nb_globals);
                } else if (!(call_flags & TCG_CALL_NO_READ_GLOBALS)) {
                    la_global_sync(s, nb_globals);
                }

                /* Record arguments that die in this helper.  */
                for (i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
                    ts = arg_temp(op->args[i]);
                    if (ts && ts->state & TS_DEAD) {
                        arg_life |= DEAD_ARG << i;
                    }
                }

                /* For all live registers, remove call-clobbered prefs.  */
                la_cross_call(s, nb_temps);

                nb_call_regs = ARRAY_SIZE(tcg_target_call_iarg_regs);

                /* Input arguments are live for preceding opcodes.  */
                for (i = 0; i < nb_iargs; i++) {
                    ts = arg_temp(op->args[i + nb_oargs]);
                    if (ts && ts->state & TS_DEAD) {
                        /* For those arguments that die, and will be allocated
                         * in registers, clear the register set for that arg,
                         * to be filled in below.  For args that will be on
                         * the stack, reset to any available reg.
                         */
                        *la_temp_pref(ts)
                            = (i < nb_call_regs ? 0 :
                               tcg_target_available_regs[ts->type]);
                        ts->state &= ~TS_DEAD;
                    }
                }

                /* For each input argument, add its input register to prefs.
                   If a temp is used once, this produces a single set bit.  */
                for (i = 0; i < MIN(nb_call_regs, nb_iargs); i++) {
                    ts = arg_temp(op->args[i + nb_oargs]);
                    if (ts) {
                        tcg_regset_set_reg(*la_temp_pref(ts),
                                           tcg_target_call_iarg_regs[i]);
                    }
                }
            }
            break;
        case INDEX_op_insn_start:
            break;
        case INDEX_op_discard:
            /* mark the temporary as dead */
            ts = arg_temp(op->args[0]);
            ts->state = TS_DEAD;
            la_reset_pref(ts);
            break;

        case INDEX_op_add2_i32:
            opc_new = INDEX_op_add_i32;
            goto do_addsub2;
        case INDEX_op_sub2_i32:
            opc_new = INDEX_op_sub_i32;
            goto do_addsub2;
        case INDEX_op_add2_i64:
            opc_new = INDEX_op_add_i64;
            goto do_addsub2;
        case INDEX_op_sub2_i64:
            opc_new = INDEX_op_sub_i64;
        do_addsub2:
            nb_iargs = 4;
            nb_oargs = 2;
            /* Test if the high part of the operation is dead, but not
               the low part.  The result can be optimized to a simple
               add or sub.  This happens often for x86_64 guest when the
               cpu mode is set to 32 bit.  */
            if (arg_temp(op->args[1])->state == TS_DEAD) {
                if (arg_temp(op->args[0])->state == TS_DEAD) {
                    goto do_remove;
                }
                /* Replace the opcode and adjust the args in place,
                   leaving 3 unused args at the end.  */
                op->opc = opc = opc_new;
                op->args[1] = op->args[2];
                op->args[2] = op->args[4];
                /* Fall through and mark the single-word operation live.  */
                nb_iargs = 2;
                nb_oargs = 1;
            }
            goto do_not_remove;

        case INDEX_op_mulu2_i32:
            opc_new = INDEX_op_mul_i32;
            opc_new2 = INDEX_op_muluh_i32;
            have_opc_new2 = TCG_TARGET_HAS_muluh_i32;
            goto do_mul2;
        case INDEX_op_muls2_i32:
            opc_new = INDEX_op_mul_i32;
            opc_new2 = INDEX_op_mulsh_i32;
            have_opc_new2 = TCG_TARGET_HAS_mulsh_i32;
            goto do_mul2;
        case INDEX_op_mulu2_i64:
            opc_new = INDEX_op_mul_i64;
            opc_new2 = INDEX_op_muluh_i64;
            have_opc_new2 = TCG_TARGET_HAS_muluh_i64;
            goto do_mul2;
        case INDEX_op_muls2_i64:
            opc_new = INDEX_op_mul_i64;
            opc_new2 = INDEX_op_mulsh_i64;
            have_opc_new2 = TCG_TARGET_HAS_mulsh_i64;
            goto do_mul2;
        do_mul2:
            nb_iargs = 2;
            nb_oargs = 2;
            if (arg_temp(op->args[1])->state == TS_DEAD) {
                if (arg_temp(op->args[0])->state == TS_DEAD) {
                    /* Both parts of the operation are dead.  */
                    goto do_remove;
                }
                /* The high part of the operation is dead; generate the low. */
                op->opc = opc = opc_new;
                op->args[1] = op->args[2];
                op->args[2] = op->args[3];
            } else if (arg_temp(op->args[0])->state == TS_DEAD && have_opc_new2) {
                /* The low part of the operation is dead; generate the high. */
                op->opc = opc = opc_new2;
                op->args[0] = op->args[1];
                op->args[1] = op->args[2];
                op->args[2] = op->args[3];
            } else {
                goto do_not_remove;
            }
            /* Mark the single-word operation live.  */
            nb_oargs = 1;
            goto do_not_remove;

        default:
            /* XXX: optimize by hardcoding common cases (e.g. triadic ops) */
            nb_iargs = def->nb_iargs;
            nb_oargs = def->nb_oargs;

            /* Test if the operation can be removed because all
               its outputs are dead. We assume that nb_oargs == 0
               implies side effects */
            if (!(def->flags & TCG_OPF_SIDE_EFFECTS) && nb_oargs != 0) {
                for (i = 0; i < nb_oargs; i++) {
                    if (arg_temp(op->args[i])->state != TS_DEAD) {
                        goto do_not_remove;
                    }
                }
                goto do_remove;
            }
            goto do_not_remove;

        do_remove:
            tcg_op_remove(s, op);
            break;

        do_not_remove:
            for (i = 0; i < nb_oargs; i++) {
                ts = arg_temp(op->args[i]);

                /* Remember the preference of the uses that followed.  */
                op->output_pref[i] = *la_temp_pref(ts);

                /* Output args are dead.  */
                if (ts->state & TS_DEAD) {
                    arg_life |= DEAD_ARG << i;
                }
                if (ts->state & TS_MEM) {
                    arg_life |= SYNC_ARG << i;
                }
                ts->state = TS_DEAD;
                la_reset_pref(ts);
            }

            /* If end of basic block, update.  */
            if (def->flags & TCG_OPF_BB_EXIT) {
                la_func_end(s, nb_globals, nb_temps);
            } else if (def->flags & TCG_OPF_COND_BRANCH) {
                la_bb_sync(s, nb_globals, nb_temps);
            } else if (def->flags & TCG_OPF_BB_END) {
                la_bb_end(s, nb_globals, nb_temps);
            } else if (def->flags & TCG_OPF_SIDE_EFFECTS) {
                la_global_sync(s, nb_globals);
                if (def->flags & TCG_OPF_CALL_CLOBBER) {
                    la_cross_call(s, nb_temps);
                }
            }

            /* Record arguments that die in this opcode.  */
            for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
                ts = arg_temp(op->args[i]);
                if (ts->state & TS_DEAD) {
                    arg_life |= DEAD_ARG << i;
                }
            }

            /* Input arguments are live for preceding opcodes.  */
            for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
                ts = arg_temp(op->args[i]);
                if (ts->state & TS_DEAD) {
                    /* For operands that were dead, initially allow
                       all regs for the type.  */
                    *la_temp_pref(ts) = tcg_target_available_regs[ts->type];
                    ts->state &= ~TS_DEAD;
                }
            }

            /* Incorporate constraints for this operand.  */
            switch (opc) {
            case INDEX_op_mov_i32:
            case INDEX_op_mov_i64:
                /* Note that these are TCG_OPF_NOT_PRESENT and do not
                   have proper constraints.  That said, special case
                   moves to propagate preferences backward.  */
                if (IS_DEAD_ARG(1)) {
                    *la_temp_pref(arg_temp(op->args[0]))
                        = *la_temp_pref(arg_temp(op->args[1]));
                }
                break;

            default:
                for (i = nb_oargs; i < nb_oargs + nb_iargs; i++) {
                    const TCGArgConstraint *ct = &def->args_ct[i];
                    TCGRegSet set, *pset;

                    ts = arg_temp(op->args[i]);
                    pset = la_temp_pref(ts);
                    set = *pset;

                    set &= ct->regs;
                    if (ct->ialias) {
                        set &= op->output_pref[ct->alias_index];
                    }
                    /* If the combination is not possible, restart.  */
                    if (set == 0) {
                        set = ct->regs;
                    }
                    *pset = set;
                }
                break;
            }
            break;
        }
        op->life = arg_life;
    }
}

/* Liveness analysis: Convert indirect regs to direct temporaries.  */
static bool liveness_pass_2(TCGContext *s)
{
    int nb_globals = s->nb_globals;
    int nb_temps, i;
    bool changes = false;
    TCGOp *op, *op_next;

    /* Create a temporary for each indirect global.  */
    for (i = 0; i < nb_globals; ++i) {
        TCGTemp *its = &s->temps[i];
        if (its->indirect_reg) {
            TCGTemp *dts = tcg_temp_alloc(s);
            dts->type = its->type;
            dts->base_type = its->base_type;
            dts->kind = TEMP_EBB;
            its->state_ptr = dts;
        } else {
            its->state_ptr = NULL;
        }
        /* All globals begin dead.  */
        its->state = TS_DEAD;
    }
    for (nb_temps = s->nb_temps; i < nb_temps; ++i) {
        TCGTemp *its = &s->temps[i];
        its->state_ptr = NULL;
        its->state = TS_DEAD;
    }

    QTAILQ_FOREACH_SAFE(op, &s->ops, link, op_next) {
        TCGOpcode opc = op->opc;
        const TCGOpDef *def = &tcg_op_defs[opc];
        TCGLifeData arg_life = op->life;
        int nb_iargs, nb_oargs, call_flags;
        TCGTemp *arg_ts, *dir_ts;

        if (opc == INDEX_op_call) {
            nb_oargs = TCGOP_CALLO(op);
            nb_iargs = TCGOP_CALLI(op);
            call_flags = tcg_call_flags(op);
        } else {
            nb_iargs = def->nb_iargs;
            nb_oargs = def->nb_oargs;

            /* Set flags similar to how calls require.  */
            if (def->flags & TCG_OPF_COND_BRANCH) {
                /* Like reading globals: sync_globals */
                call_flags = TCG_CALL_NO_WRITE_GLOBALS;
            } else if (def->flags & TCG_OPF_BB_END) {
                /* Like writing globals: save_globals */
                call_flags = 0;
            } else if (def->flags & TCG_OPF_SIDE_EFFECTS) {
                /* Like reading globals: sync_globals */
                call_flags = TCG_CALL_NO_WRITE_GLOBALS;
            } else {
                /* No effect on globals.  */
                call_flags = (TCG_CALL_NO_READ_GLOBALS |
                              TCG_CALL_NO_WRITE_GLOBALS);
            }
        }

        /* Make sure that input arguments are available.  */
        for (i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
            arg_ts = arg_temp(op->args[i]);
            if (arg_ts) {
                dir_ts = arg_ts->state_ptr;
                if (dir_ts && arg_ts->state == TS_DEAD) {
                    TCGOpcode lopc = (arg_ts->type == TCG_TYPE_I32
                                      ? INDEX_op_ld_i32
                                      : INDEX_op_ld_i64);
                    TCGOp *lop = tcg_op_insert_before(s, op, lopc);

                    lop->args[0] = temp_arg(dir_ts);
                    lop->args[1] = temp_arg(arg_ts->mem_base);
                    lop->args[2] = arg_ts->mem_offset;

                    /* Loaded, but synced with memory.  */
                    arg_ts->state = TS_MEM;
                }
            }
        }

        /* Perform input replacement, and mark inputs that became dead.
           No action is required except keeping temp_state up to date
           so that we reload when needed.  */
        for (i = nb_oargs; i < nb_iargs + nb_oargs; i++) {
            arg_ts = arg_temp(op->args[i]);
            if (arg_ts) {
                dir_ts = arg_ts->state_ptr;
                if (dir_ts) {
                    op->args[i] = temp_arg(dir_ts);
                    changes = true;
                    if (IS_DEAD_ARG(i)) {
                        arg_ts->state = TS_DEAD;
                    }
                }
            }
        }

        /* Liveness analysis should ensure that the following are
           all correct, for call sites and basic block end points.  */
        if (call_flags & TCG_CALL_NO_READ_GLOBALS) {
            /* Nothing to do */
        } else if (call_flags & TCG_CALL_NO_WRITE_GLOBALS) {
            for (i = 0; i < nb_globals; ++i) {
                /* Liveness should see that globals are synced back,
                   that is, either TS_DEAD or TS_MEM.  */
                arg_ts = &s->temps[i];
                tcg_debug_assert(arg_ts->state_ptr == 0
                                 || arg_ts->state != 0);
            }
        } else {
            for (i = 0; i < nb_globals; ++i) {
                /* Liveness should see that globals are saved back,
                   that is, TS_DEAD, waiting to be reloaded.  */
                arg_ts = &s->temps[i];
                tcg_debug_assert(arg_ts->state_ptr == 0
                                 || arg_ts->state == TS_DEAD);
            }
        }

        /* Outputs become available.  */
        if (opc == INDEX_op_mov_i32 || opc == INDEX_op_mov_i64) {
            arg_ts = arg_temp(op->args[0]);
            dir_ts = arg_ts->state_ptr;
            if (dir_ts) {
                op->args[0] = temp_arg(dir_ts);
                changes = true;

                /* The output is now live and modified.  */
                arg_ts->state = 0;

                if (NEED_SYNC_ARG(0)) {
                    TCGOpcode sopc = (arg_ts->type == TCG_TYPE_I32
                                      ? INDEX_op_st_i32
                                      : INDEX_op_st_i64);
                    TCGOp *sop = tcg_op_insert_after(s, op, sopc);
                    TCGTemp *out_ts = dir_ts;

                    if (IS_DEAD_ARG(0)) {
                        out_ts = arg_temp(op->args[1]);
                        arg_ts->state = TS_DEAD;
                        tcg_op_remove(s, op);
                    } else {
                        arg_ts->state = TS_MEM;
                    }

                    sop->args[0] = temp_arg(out_ts);
                    sop->args[1] = temp_arg(arg_ts->mem_base);
                    sop->args[2] = arg_ts->mem_offset;
                } else {
                    tcg_debug_assert(!IS_DEAD_ARG(0));
                }
            }
        } else {
            for (i = 0; i < nb_oargs; i++) {
                arg_ts = arg_temp(op->args[i]);
                dir_ts = arg_ts->state_ptr;
                if (!dir_ts) {
                    continue;
                }
                op->args[i] = temp_arg(dir_ts);
                changes = true;

                /* The output is now live and modified.  */
                arg_ts->state = 0;

                /* Sync outputs upon their last write.  */
                if (NEED_SYNC_ARG(i)) {
                    TCGOpcode sopc = (arg_ts->type == TCG_TYPE_I32
                                      ? INDEX_op_st_i32
                                      : INDEX_op_st_i64);
                    TCGOp *sop = tcg_op_insert_after(s, op, sopc);

                    sop->args[0] = temp_arg(dir_ts);
                    sop->args[1] = temp_arg(arg_ts->mem_base);
                    sop->args[2] = arg_ts->mem_offset;

                    arg_ts->state = TS_MEM;
                }
                /* Drop outputs that are dead.  */
                if (IS_DEAD_ARG(i)) {
                    arg_ts->state = TS_DEAD;
                }
            }
        }
    }

    return changes;
}

#ifdef CONFIG_DEBUG_TCG
static void dump_regs(TCGContext *s)
{
    TCGTemp *ts;
    int i;
    char buf[64];

    for(i = 0; i < s->nb_temps; i++) {
        ts = &s->temps[i];
        printf("  %10s: ", tcg_get_arg_str_ptr(s, buf, sizeof(buf), ts));
        switch(ts->val_type) {