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fsub.c

#include <linux/types.h>
#include <linux/errno.h>
#include <asm/uaccess.h>

#include <asm/sfp-machine.h>
#include <math-emu/soft-fp.h>
#include <math-emu/double.h>

int
fsub(void *frD, void *frA, void *frB)
{
      FP_DECL_D(A);
      FP_DECL_D(B);
      FP_DECL_D(R);
      FP_DECL_EX;
      int ret = 0;

#ifdef DEBUG
      printk("%s: %p %p %p\n", __func__, frD, frA, frB);
#endif

      FP_UNPACK_DP(A, frA);
      FP_UNPACK_DP(B, frB);

#ifdef DEBUG
      printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
      printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
#endif

      if (B_c != FP_CLS_NAN)
            B_s ^= 1;

      if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
            ret |= EFLAG_VXISI;

      FP_ADD_D(R, A, B);

#ifdef DEBUG
      printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
#endif

      __FP_PACK_D(frD, R);

      return FP_CUR_EXCEPTIONS;
}

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