arch/powerpc/math-emu/fnmsub.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
  10 int
  11 fnmsub(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 (B_c != FP_CLS_NAN)
  41                 B_s ^= 1;
  42
  43         if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
  44                 FP_SET_EXCEPTION(EFLAG_VXISI);
  45
  46         FP_ADD_D(R, T, B);
  47
  48         if (R_c != FP_CLS_NAN)
  49                 R_s ^= 1;
  50
  51 #ifdef DEBUG
  52         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  53 #endif
  54
  55         __FP_PACK_D(frD, R);
  56
  57         return FP_CUR_EXCEPTIONS;
  58 }