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

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

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