LXR linux/arch/powerpc/math-emu/fnmadd.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/types.h>
   3#include <linux/errno.h>
   4#include <linux/uaccess.h>
   5
   6#include <asm/sfp-machine.h>
   7#include <math-emu/soft-fp.h>
   8#include <math-emu/double.h>
   9
  10int
  11fnmadd(void *frD, void *frA, void *frB, void *frC)
  12{
  13        FP_DECL_D(R);
  14        FP_DECL_D(A);
  15        FP_DECL_D(B);
  16        FP_DECL_D(C);
  17        FP_DECL_D(T);
  18        FP_DECL_EX;
  19
  20#ifdef DEBUG
  21        printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
  22#endif
  23
  24        FP_UNPACK_DP(A, frA);
  25        FP_UNPACK_DP(B, frB);
  26        FP_UNPACK_DP(C, frC);
  27
  28#ifdef DEBUG
  29        printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  30        printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  31        printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
  32#endif
  33
  34        if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
  35            (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
  36                FP_SET_EXCEPTION(EFLAG_VXIMZ);
  37
  38        FP_MUL_D(T, A, C);
  39
  40        if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
  41                FP_SET_EXCEPTION(EFLAG_VXISI);
  42
  43        FP_ADD_D(R, T, B);
  44
  45        if (R_c != FP_CLS_NAN)
  46                R_s ^= 1;
  47
  48#ifdef DEBUG
  49        printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  50#endif
  51
  52        __FP_PACK_D(frD, R);
  53
  54        return FP_CUR_EXCEPTIONS;
  55}
  56