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

http://github.com/mirrors/linux
C | 57 lines | 46 code | 10 blank | 1 comment | 13 complexity | 5523d6d490f99d58af58293df662cb27 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
11fdiv(void *frD, void *frA, void *frB)
12{
13	FP_DECL_D(A);
14	FP_DECL_D(B);
15	FP_DECL_D(R);
16	FP_DECL_EX;
17
18#ifdef DEBUG
19	printk("%s: %p %p %p\n", __func__, frD, frA, frB);
20#endif
21
22	FP_UNPACK_DP(A, frA);
23	FP_UNPACK_DP(B, frB);
24
25#ifdef DEBUG
26	printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
27	printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
28#endif
29
30	if (A_c == FP_CLS_ZERO && B_c == FP_CLS_ZERO) {
31		FP_SET_EXCEPTION(EFLAG_VXZDZ);
32#ifdef DEBUG
33		printk("%s: FPSCR_VXZDZ raised\n", __func__);
34#endif
35	}
36	if (A_c == FP_CLS_INF && B_c == FP_CLS_INF) {
37		FP_SET_EXCEPTION(EFLAG_VXIDI);
38#ifdef DEBUG
39		printk("%s: FPSCR_VXIDI raised\n", __func__);
40#endif
41	}
42
43	if (B_c == FP_CLS_ZERO && A_c != FP_CLS_ZERO) {
44		FP_SET_EXCEPTION(EFLAG_DIVZERO);
45		if (__FPU_TRAP_P(EFLAG_DIVZERO))
46			return FP_CUR_EXCEPTIONS;
47	}
48	FP_DIV_D(R, A, B);
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}