linux/arch/powerpc/math-emu/fnmsub.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
   9int
  10fnmsub(void *frD, void *frA, void *frB, void *frC)
  11{
  12        FP_DECL_D(R);
  13        FP_DECL_D(A);
  14        FP_DECL_D(B);
  15        FP_DECL_D(C);
  16        FP_DECL_D(T);
  17        FP_DECL_EX;
  18
  19#ifdef DEBUG
  20        printk("%s: %p %p %p %p\n", __func__, frD, frA, frB, frC);
  21#endif
  22
  23        FP_UNPACK_DP(A, frA);
  24        FP_UNPACK_DP(B, frB);
  25        FP_UNPACK_DP(C, frC);
  26
  27#ifdef DEBUG
  28        printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
  29        printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
  30        printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
  31#endif
  32
  33        if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
  34            (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
  35                FP_SET_EXCEPTION(EFLAG_VXIMZ);
  36
  37        FP_MUL_D(T, A, C);
  38
  39        if (B_c != FP_CLS_NAN)
  40                B_s ^= 1;
  41
  42        if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
  43                FP_SET_EXCEPTION(EFLAG_VXISI);
  44
  45        FP_ADD_D(R, T, B);
  46
  47        if (R_c != FP_CLS_NAN)
  48                R_s ^= 1;
  49
  50#ifdef DEBUG
  51        printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
  52#endif
  53
  54        __FP_PACK_D(frD, R);
  55
  56        return FP_CUR_EXCEPTIONS;
  57}
  58