/* ix87 specific frexp implementation for double.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <machine/asm.h>

#include <libm-alias-double.h>

	.section .rodata

	.align ALIGNARG(4)

	.type two54,@object

two54:	.byte 0, 0, 0, 0, 0, 0, 0x50, 0x43

	ASM_SIZE_DIRECTIVE(two54)

#ifdef PIC

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

#else

#define MO(op) op

#endif

#define PARMS	4		/* no space for saved regs */

#define VAL0	PARMS

#define VAL1	VAL0+4

#define EXPP	VAL1+4

	.text

ENTRY (__frexp)

	movl	VAL0(%esp), %ecx

	movl	VAL1(%esp), %eax

	movl	%eax, %edx

	andl	$0x7fffffff, %eax

	orl	%eax, %ecx

	jz	1f

	xorl	%ecx, %ecx

	cmpl	$0x7ff00000, %eax

	jae	1f

	cmpl	$0x00100000, %eax

	jae	2f

	fldl	VAL0(%esp)

#ifdef	PIC

	LOAD_PIC_REG (dx)

#endif

	fmull	MO(two54)

	movl	$-54, %ecx

	fstpl	VAL0(%esp)

	fwait

	movl	VAL1(%esp), %eax

	movl	%eax, %edx

	andl	$0x7fffffff, %eax

2:	shrl	$20, %eax

	andl	$0x800fffff, %edx

	subl	$1022, %eax

	orl	$0x3fe00000, %edx

	addl	%eax, %ecx

	movl	%edx, VAL1(%esp)

	/* Store %ecx in the variable pointed to by the second argument,

	   get the factor from the stack and return.  */

1:	movl	EXPP(%esp), %eax

	fldl	VAL0(%esp)

	movl	%ecx, (%eax)

	ret

END (__frexp)

libm_alias_double (__frexp, frexp)