/*

 * Written by J.T. Conklin <jtc@netbsd.org>.

 * Public domain.

 */

#include <machine/asm.h>

#include <i386-math-asm.h>

RCSID("$NetBSD: s_log1pf.S,v 1.4 1995/05/09 00:13:05 jtc Exp $")

	.section .rodata

	.align ALIGNARG(4)

	/* The fyl2xp1 can only be used for values in

		-1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2

	   0.29 is a safe value.

	*/

limit:	.float 0.29

one:	.float 1.0

DEFINE_FLT_MIN

#ifdef PIC

# define MO(op) op##@GOTOFF(%edx)

#else

# define MO(op) op

#endif

/*

 * Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29,

 * otherwise fyl2x with the needed extra computation.

 */

	.text

ENTRY(__log1pf)

	fldln2

	flds	4(%esp)

#ifdef	PIC

	LOAD_PIC_REG (dx)

#endif

	fxam

	fnstsw

	fld	%st

	sahf

	jc	3f		// in case x is NaN or ±Inf

4:	fabs

	fcomps	MO(limit)

	fnstsw

	sahf

	jc	2f

	fadds	MO(one)

	fyl2x

	ret

2:	fyl2xp1

	FLT_CHECK_FORCE_UFLOW_NONNAN

	ret

3:	jp	4b		// in case x is ±Inf

	fstp	%st(1)

	fstp	%st(1)

	ret

END (__log1pf)