blob: 99217c837a2431796583b0d9c272dfde9594e555 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
/* $OpenBSD: e_sqrtf.c,v 1.1 2009/04/05 19:26:27 martynas Exp $ */
/*
* Written by Martynas Venckus. Public domain
*/
#include <sys/types.h>
#include <math.h>
#define FPSCR_PR (1 << 19)
float
sqrtf(float f)
{
register_t fpscr, nfpscr;
__asm__ __volatile__ ("sts fpscr, %0" : "=r" (fpscr));
/* Set floating-point mode to single-precision. */
nfpscr = fpscr & ~FPSCR_PR;
__asm__ __volatile__ ("lds %0, fpscr" : : "r" (nfpscr));
__asm__ __volatile__ ("fsqrt %0" : "+f" (f));
/* Restore fp status/control register. */
__asm__ __volatile__ ("lds %0, fpscr" : : "r" (fpscr));
return (f);
}
|
