LXR linux/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
   9int
  10fsub(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}
  45