sysdeps/libm-i387/e_asinf.S


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

/*
 * 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: $")

/* asin = atan (x / sqrt(1 - x^2)) */
ENTRY(__ieee754_asinf)
	flds	4(%esp)			/* x */
	fst	%st(1)
	fmul	%st(0)			/* x^2 */
	fld1
	fsubp				/* 1 - x^2 */
	fsqrt				/* sqrt (1 - x^2) */
	fpatan
	ret
END (__ieee754_asinf)