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

http://github.com/mirrors/linux
C | 41 lines | 30 code | 10 blank | 1 comment | 5 complexity | 5edce86c773fefe62d236dff376d4eac 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
11fsqrt(void *frD, void *frB)
12{
13	FP_DECL_D(B);
14	FP_DECL_D(R);
15	FP_DECL_EX;
16
17#ifdef DEBUG
18	printk("%s: %p %p %p %p\n", __func__, frD, frB);
19#endif
20
21	FP_UNPACK_DP(B, frB);
22
23#ifdef DEBUG
24	printk("B: %ld %lu %lu %ld (%ld)\n", B_s, B_f1, B_f0, B_e, B_c);
25#endif
26
27	if (B_s && B_c != FP_CLS_ZERO)
28		FP_SET_EXCEPTION(EFLAG_VXSQRT);
29	if (B_c == FP_CLS_NAN)
30		FP_SET_EXCEPTION(EFLAG_VXSNAN);
31
32	FP_SQRT_D(R, B);
33
34#ifdef DEBUG
35	printk("R: %ld %lu %lu %ld (%ld)\n", R_s, R_f1, R_f0, R_e, R_c);
36#endif
37
38	__FP_PACK_D(frD, R);
39
40	return FP_CUR_EXCEPTIONS;
41}