glibc/sysdeps/libm-i387/e_asinl.S

/*
 * Written by J.T. Conklin <jtc@netbsd.org>.
 * Public domain.
 *
 * Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
 */

#include <machine/asm.h>

RCSID("$NetBSD: $")

/* asinl = atanl (x / sqrtl(1 - x^2)) */
ENTRY(__ieee754_asinl)
	fldt	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_asinl)