LXR linux/arch/powerpc/math-emu/fsub.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/types.h>
   3#include <linux/errno.h>
   4#include <linux/uaccess.h>
   5
   6#include <asm/sfp-machine.h>
   7#include <math-emu/soft-fp.h>
   8#include <math-emu/double.h>
   9
  10int
  11fsub(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
  18#ifdef DEBUG
  19        printk("%s: %p %p %p\n", __func__, frD, frA, frB);
  20#endif
  21
  22        FP_UNPACK_DP(A, frA);
  23        FP_UNPACK_DP(B, frB);
  24
  25#ifdef DEBUG
  26        printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  27        printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  28#endif
  29
  30        if (B_c != FP_CLS_NAN)
  31                B_s ^= 1;
  32
  33        if (A_s != B_s && A_c == FP_CLS_INF && B_c == FP_CLS_INF)
  34                FP_SET_EXCEPTION(EFLAG_VXISI);
  35
  36        FP_ADD_D(R, A, B);
  37
  38#ifdef DEBUG
  39        printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  40#endif
  41
  42        __FP_PACK_D(frD, R);
  43
  44        return FP_CUR_EXCEPTIONS;
  45}
  46