arch/powerpc/math-emu/fdivs.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 #include <math-emu/single.h>
   9
  10 int
  11 fdivs(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         int ret = 0;
  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 (A_c == FP_CLS_ZERO && B_c == FP_CLS_ZERO) {
  32                 ret |= EFLAG_VXZDZ;
  33 #ifdef DEBUG
  34                 printk("%s: FPSCR_VXZDZ raised\n", __func__);
  35 #endif
  36         }
  37         if (A_c == FP_CLS_INF && B_c == FP_CLS_INF) {
  38                 ret |= EFLAG_VXIDI;
  39 #ifdef DEBUG
  40                 printk("%s: FPSCR_VXIDI raised\n", __func__);
  41 #endif
  42         }
  43
  44         if (B_c == FP_CLS_ZERO && A_c != FP_CLS_ZERO) {
  45                 ret |= EFLAG_DIVZERO;
  46                 if (__FPU_TRAP_P(EFLAG_DIVZERO))
  47                         return ret;
  48         }
  49
  50         FP_DIV_D(R, A, B);
  51
  52 #ifdef DEBUG
  53         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  54 #endif
  55
  56         __FP_PACK_DS(frD, R);
  57
  58         return FP_CUR_EXCEPTIONS;
  59 }