arch/powerpc/math-emu/fsub.c

   1 #include <linux/types.h>
   2 #include <linux/errno.h>
   3 #include <asm/uaccess.h>
   4
   5 #include <asm/sfp-machine.h>
   6 #include <math-emu/soft-fp.h>
   7 #include <math-emu/double.h>
   8
   9 int
  10 fsub(void *frD, void *frA, void *frB)
  11 {
  12         FP_DECL_D(A);
  13         FP_DECL_D(B);
  14         FP_DECL_D(R);
  15         FP_DECL_EX;
  16
  17 #ifdef DEBUG
  18         printk("%s: %p %p %p\n", __func__, frD, frA, frB);
  19 #endif
  20
  21         FP_UNPACK_DP(A, frA);
  22         FP_UNPACK_DP(B, frB);
  23
  24 #ifdef DEBUG
  25         printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  26         printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  27 #endif
  28
  29         if (B_c != FP_CLS_NAN)
  30                 B_s ^= 1;
  31
  32         if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
  33                 FP_SET_EXCEPTION(EFLAG_VXISI);
  34
  35         FP_ADD_D(R, A, B);
  36
  37 #ifdef DEBUG
  38         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  39 #endif
  40
  41         __FP_PACK_D(frD, R);
  42
  43         return FP_CUR_EXCEPTIONS;
  44 }