arch/powerpc/math-emu/fsub.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 fsub(void *frD, void *frA, void *frB)
  12 {
  13         FP_DECL_D(A);
  14         FP_DECL_D(B);
  15         FP_DECL_D(R);
  16         FP_DECL_EX;
  17
  18 #ifdef DEBUG
  19         printk("%s: %p %p %p\n", __func__, frD, frA, frB);
  20 #endif
  21
  22         FP_UNPACK_DP(A, frA);
  23         FP_UNPACK_DP(B, frB);
  24
  25 #ifdef DEBUG
  26         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  27         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  28 #endif
  29
  30         if (B_c != FP_CLS_NAN)
  31                 B_s ^= 1;
  32
  33         if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
  34                 FP_SET_EXCEPTION(EFLAG_VXISI);
  35
  36         FP_ADD_D(R, A, B);
  37
  38 #ifdef DEBUG
  39         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  40 #endif
  41
  42         __FP_PACK_D(frD, R);
  43
  44         return FP_CUR_EXCEPTIONS;
  45 }