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
fnmsub(void * frD,void * frA,void * frB,void * frC)11 fnmsub(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 	if (R_c != FP_CLS_NAN)
49 		R_s ^= 1;
50 
51 #ifdef DEBUG
52 	printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
53 #endif
54 
55 	__FP_PACK_D(frD, R);
56 
57 	return FP_CUR_EXCEPTIONS;
58 }
59