aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/i386/fpu/e_acosf.S
blob: 54930af8b2a66e3df87a0c936dafb8c179fef71a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 * Adapted for float type by Ulrich Drepper <drepper@cygnus.com>.
 */

#include <machine/asm.h>

RCSID("$NetBSD: $")

/* acos = atan (sqrt(1 - x^2) / x) */
ENTRY(__ieee754_acosf)
	flds	4(%esp)			/* x */
	fld	%st
	fmul	%st(0)			/* x^2 */
	fld1
	fsubp				/* 1 - x^2 */
	fsqrt				/* sqrt (1 - x^2) */
	fabs
	fxch	%st(1)
	fpatan
	ret
END (__ieee754_acosf)
strong_alias (__ieee754_acosf, __acosf_finite)