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/arch/powerpc/math-emu/fmadd.c

http://github.com/mirrors/linux
C | 52 lines | 39 code | 12 blank | 1 comment | 13 complexity | d343aea7f688573955578cd25f5ede59 MD5 | raw file
 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
11fmadd(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 (T_s != B_s && T_c == FP_CLS_INF && B_c == FP_CLS_INF)
41		FP_SET_EXCEPTION(EFLAG_VXISI);
42
43	FP_ADD_D(R, T, B);
44
45#ifdef DEBUG
46	printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
47#endif
48
49	__FP_PACK_D(frD, R);
50
51	return FP_CUR_EXCEPTIONS;
52}