arch/powerpc/math-emu/fsubs.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 #include <math-emu/single.h>
  10
  11 int
  12 fsubs(void *frD, void *frA, void *frB)
  13 {
  14         FP_DECL_D(A);
  15         FP_DECL_D(B);
  16         FP_DECL_D(R);
  17         FP_DECL_EX;
  18
  19 #ifdef DEBUG
  20         printk("%s: %p %p %p\n", __func__, frD, frA, frB);
  21 #endif
  22
  23         FP_UNPACK_DP(A, frA);
  24         FP_UNPACK_DP(B, frB);
  25
  26 #ifdef DEBUG
  27         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  28         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  29 #endif
  30
  31         if (B_c != FP_CLS_NAN)
  32                 B_s ^= 1;
  33
  34         if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
  35                 FP_SET_EXCEPTION(EFLAG_VXISI);
  36
  37         FP_ADD_D(R, A, B);
  38
  39 #ifdef DEBUG
  40         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  41 #endif
  42
  43         __FP_PACK_DS(frD, R);
  44
  45         return FP_CUR_EXCEPTIONS;
  46 }