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Linux/arch/powerpc/math-emu/fdiv.c

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  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 fdiv(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 (A_c == FP_CLS_ZERO && B_c == FP_CLS_ZERO) {
 30                 FP_SET_EXCEPTION(EFLAG_VXZDZ);
 31 #ifdef DEBUG
 32                 printk("%s: FPSCR_VXZDZ raised\n", __func__);
 33 #endif
 34         }
 35         if (A_c == FP_CLS_INF && B_c == FP_CLS_INF) {
 36                 FP_SET_EXCEPTION(EFLAG_VXIDI);
 37 #ifdef DEBUG
 38                 printk("%s: FPSCR_VXIDI raised\n", __func__);
 39 #endif
 40         }
 41 
 42         if (B_c == FP_CLS_ZERO && A_c != FP_CLS_ZERO) {
 43                 FP_SET_EXCEPTION(EFLAG_DIVZERO);
 44                 if (__FPU_TRAP_P(EFLAG_DIVZERO))
 45                         return FP_CUR_EXCEPTIONS;
 46         }
 47         FP_DIV_D(R, A, B);
 48 
 49 #ifdef DEBUG
 50         printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
 51 #endif
 52 
 53         __FP_PACK_D(frD, R);
 54 
 55         return FP_CUR_EXCEPTIONS;
 56 }
 57 

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