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

 1#include <linux/types.h>
 2#include <linux/errno.h>
 3#include <asm/uaccess.h>
 4
 5#include <asm/sfp-machine.h>
 6#include <math-emu/soft-fp.h>
 7#include <math-emu/double.h>
 8
 9int
10fdiv(void *frD, void *frA, void *frB)
11{
12	FP_DECL_D(A);
13	FP_DECL_D(B);
14	FP_DECL_D(R);
15	FP_DECL_EX;
16
17#ifdef DEBUG
18	printk("%s: %p %p %p\n", __func__, frD, frA, frB);
19#endif
20
21	FP_UNPACK_DP(A, frA);
22	FP_UNPACK_DP(B, frB);
23
24#ifdef DEBUG
25	printk("A: %ld %lu %lu %ld (%ld)\n", A_s, A_f1, A_f0, A_e, A_c);
26	printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
27#endif
28
29	if (A_c == FP_CLS_ZERO && B_c == FP_CLS_ZERO) {
30		FP_SET_EXCEPTION(EFLAG_VXZDZ);
31#ifdef DEBUG
32		printk("%s: FPSCR_VXZDZ raised\n", __func__);
33#endif
34	}
35	if (A_c == FP_CLS_INF && B_c == FP_CLS_INF) {
36		FP_SET_EXCEPTION(EFLAG_VXIDI);
37#ifdef DEBUG
38		printk("%s: FPSCR_VXIDI raised\n", __func__);
39#endif
40	}
41
42	if (B_c == FP_CLS_ZERO && A_c != FP_CLS_ZERO) {
43		FP_SET_EXCEPTION(EFLAG_DIVZERO);
44		if (__FPU_TRAP_P(EFLAG_DIVZERO))
45			return FP_CUR_EXCEPTIONS;
46	}
47	FP_DIV_D(R, A, B);
48
49#ifdef DEBUG
50	printk("D: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
51#endif
52
53	__FP_PACK_D(frD, R);
54
55	return FP_CUR_EXCEPTIONS;
56}