LXR linux/arch/m68k/math-emu/fp

   1/*
   2 * fp_emu.h
   3 *
   4 * Copyright Roman Zippel, 1997.  All rights reserved.
   5 *
   6 * Redistribution and use in source and binary forms, with or without
   7 * modification, are permitted provided that the following conditions
   8 * are met:
   9 * 1. Redistributions of source code must retain the above copyright
  10 *    notice, and the entire permission notice in its entirety,
  11 *    including the disclaimer of warranties.
  12 * 2. Redistributions in binary form must reproduce the above copyright
  13 *    notice, this list of conditions and the following disclaimer in the
  14 *    documentation and/or other materials provided with the distribution.
  15 * 3. The name of the author may not be used to endorse or promote
  16 *    products derived from this software without specific prior
  17 *    written permission.
  18 *
  19 * ALTERNATIVELY, this product may be distributed under the terms of
  20 * the GNU General Public License, in which case the provisions of the GPL are
  21 * required INSTEAD OF the above restrictions.  (This clause is
  22 * necessary due to a potential bad interaction between the GPL and
  23 * the restrictions contained in a BSD-style copyright.)
  24 *
  25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  29 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  31 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  33 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  35 * OF THE POSSIBILITY OF SUCH DAMAGE.
  36 */
  37
  38#ifndef _FP_EMU_H
  39#define _FP_EMU_H
  40
  41#ifdef __ASSEMBLY__
  42#include <asm/asm-offsets.h>
  43#endif
  44#include <asm/math-emu.h>
  45
  46#ifndef __ASSEMBLY__
  47
  48#define IS_INF(a) ((a)->exp == 0x7fff)
  49#define IS_ZERO(a) ((a)->mant.m64 == 0)
  50
  51
  52#define fp_set_sr(bit) ({                                       \
  53        FPDATA->fpsr |= 1 << (bit);                             \
  54})
  55
  56#define fp_set_quotient(quotient) ({                            \
  57        FPDATA->fpsr &= 0xff00ffff;                             \
  58        FPDATA->fpsr |= ((quotient) & 0xff) << 16;              \
  59})
  60
  61/* linkage for several useful functions */
  62
  63/* Normalize the extended struct, return 0 for a NaN */
  64#define fp_normalize_ext(fpreg) ({                              \
  65        register struct fp_ext *reg asm ("a0") = fpreg;         \
  66        register int res asm ("d0");                            \
  67                                                                \
  68        asm volatile ("jsr fp_conv_ext2ext"                     \
  69                        : "=d" (res) : "a" (reg)                \
  70                        : "a1", "d1", "d2", "memory");          \
  71        res;                                                    \
  72})
  73
  74#define fp_copy_ext(dest, src) ({                               \
  75        *dest = *src;                                           \
  76})
  77
  78#define fp_monadic_check(dest, src) ({                          \
  79        fp_copy_ext(dest, src);                                 \
  80        if (!fp_normalize_ext(dest))                            \
  81                return dest;                                    \
  82})
  83
  84#define fp_dyadic_check(dest, src) ({                           \
  85        if (!fp_normalize_ext(dest))                            \
  86                return dest;                                    \
  87        if (!fp_normalize_ext(src)) {                           \
  88                fp_copy_ext(dest, src);                         \
  89                return dest;                                    \
  90        }                                                       \
  91})
  92
  93extern const struct fp_ext fp_QNaN;
  94extern const struct fp_ext fp_Inf;
  95
  96#define fp_set_nan(dest) ({                                     \
  97        fp_set_sr(FPSR_EXC_OPERR);                              \
  98        *dest = fp_QNaN;                                        \
  99})
 100
 101/* TODO check rounding mode? */
 102#define fp_set_ovrflw(dest) ({                                  \
 103        fp_set_sr(FPSR_EXC_OVFL);                               \
 104        dest->exp = 0x7fff;                                     \
 105        dest->mant.m64 = 0;                                     \
 106})
 107
 108#define fp_conv_ext2long(src) ({                                \
 109        register struct fp_ext *__src asm ("a0") = src;         \
 110        register int __res asm ("d0");                          \
 111                                                                \
 112        asm volatile ("jsr fp_conv_ext2long"                    \
 113                        : "=d" (__res) : "a" (__src)            \
 114                        : "a1", "d1", "d2", "memory");          \
 115        __res;                                                  \
 116})
 117
 118#define fp_conv_long2ext(dest, src) ({                          \
 119        register struct fp_ext *__dest asm ("a0") = dest;       \
 120        register int __src asm ("d0") = src;                    \
 121                                                                \
 122        asm volatile ("jsr fp_conv_ext2long"                    \
 123                        : : "d" (__src), "a" (__dest)           \
 124                        : "a1", "d1", "d2", "memory");          \
 125})
 126
 127#else /* __ASSEMBLY__ */
 128
 129/*
 130 * set, reset or clear a bit in the fp status register
 131 */
 132.macro  fp_set_sr       bit
 133        bset    #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
 134.endm
 135
 136.macro  fp_clr_sr       bit
 137        bclr    #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
 138.endm
 139
 140.macro  fp_tst_sr       bit
 141        btst    #(\bit&7),(FPD_FPSR+3-(\bit/8),FPDATA)
 142.endm
 143
 144#endif /* __ASSEMBLY__ */
 145
 146#endif /* _FP_EMU_H */
 147