1/*
2 * BK Id: SCCS/s.fnmsub.c 1.6 05/17/01 18:14:22 cort
3 */
4#include <linux/types.h>
5#include <linux/errno.h>
6#include <asm/uaccess.h>
7
8#include "soft-fp.h"
9#include "double.h"
10
11int
12fnmsub(void *frD, void *frA, void *frB, void *frC)
13{
14	FP_DECL_D(R);
15	FP_DECL_D(A);
16	FP_DECL_D(B);
17	FP_DECL_D(C);
18	FP_DECL_D(T);
19	int ret = 0;
20
21#ifdef DEBUG
22	printk("%s: %p %p %p %p\n", __FUNCTION__, frD, frA, frB, frC);
23#endif
24
25	__FP_UNPACK_D(A, frA);
26	__FP_UNPACK_D(B, frB);
27	__FP_UNPACK_D(C, frC);
28
29#ifdef DEBUG
30	printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
31	printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
32	printk("C: %ld %lu %lu %ld (%ld)\n", C_s, C_f1, C_f0, C_e, C_c);
33#endif
34
35	if ((A_c == FP_CLS_INF && C_c == FP_CLS_ZERO) ||
36	    (A_c == FP_CLS_ZERO && C_c == FP_CLS_INF))
37		ret |= EFLAG_VXIMZ;
38
39	FP_MUL_D(T, A, C);
40
41	if (B_c != FP_CLS_NAN)
42		B_s ^= 1;
43
44	if (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
45		ret |= EFLAG_VXISI;
46
47	FP_ADD_D(R, T, B);
48
49	if (R_c != FP_CLS_NAN)
50		R_s ^= 1;
51
52#ifdef DEBUG
53	printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
54#endif
55
56	return (ret | __FP_PACK_D(frD, R));
57}
58