dnl  x86 mpn_add_n/mpn_sub_n -- mpn addition and subtraction.

dnl  Copyright 1992, 1994-1996, 1999-2002 Free Software Foundation, Inc.

dnl  This file is part of the GNU MP Library.

dnl

dnl  The GNU MP Library is free software; you can redistribute it and/or modify

dnl  it under the terms of either:

dnl

dnl    * the GNU Lesser General Public License as published by the Free

dnl      Software Foundation; either version 3 of the License, or (at your

dnl      option) any later version.

dnl

dnl  or

dnl

dnl    * the GNU General Public License as published by the Free Software

dnl      Foundation; either version 2 of the License, or (at your option) any

dnl      later version.

dnl

dnl  or both in parallel, as here.

dnl

dnl  The GNU MP Library is distributed in the hope that it will be useful, but

dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

dnl  for more details.

dnl

dnl  You should have received copies of the GNU General Public License and the

dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,

dnl  see https://www.gnu.org/licenses/.

include(`../config.m4')

C     cycles/limb

C P5	3.375

C P6	3.125

C K6	3.5

C K7	2.25

C P4	8.75

ifdef(`OPERATION_add_n',`

	define(M4_inst,        adcl)

	define(M4_function_n,  mpn_add_n)

	define(M4_function_nc, mpn_add_nc)

',`ifdef(`OPERATION_sub_n',`

	define(M4_inst,        sbbl)

	define(M4_function_n,  mpn_sub_n)

	define(M4_function_nc, mpn_sub_nc)

',`m4_error(`Need OPERATION_add_n or OPERATION_sub_n

')')')

MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)

C mp_limb_t M4_function_n (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,

C                          mp_size_t size);

C mp_limb_t M4_function_nc (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,

C	                    mp_size_t size, mp_limb_t carry);

defframe(PARAM_CARRY,20)

defframe(PARAM_SIZE, 16)

defframe(PARAM_SRC2, 12)

defframe(PARAM_SRC1, 8)

defframe(PARAM_DST,  4)

	TEXT

	ALIGN(8)

PROLOGUE(M4_function_nc)

deflit(`FRAME',0)

	pushl	%edi		FRAME_pushl()

	pushl	%esi		FRAME_pushl()

	movl	PARAM_DST,%edi

	movl	PARAM_SRC1,%esi

	movl	PARAM_SRC2,%edx

	movl	PARAM_SIZE,%ecx

	movl	%ecx,%eax

	shrl	$3,%ecx			C compute count for unrolled loop

	negl	%eax

	andl	$7,%eax			C get index where to start loop

	jz	L(oopgo)		C necessary special case for 0

	incl	%ecx			C adjust loop count

	shll	$2,%eax			C adjustment for pointers...

	subl	%eax,%edi		C ... since they are offset ...

	subl	%eax,%esi		C ... by a constant when we ...

	subl	%eax,%edx		C ... enter the loop

	shrl	$2,%eax			C restore previous value

ifdef(`PIC',`

	C Calculate start address in loop for PIC.  Due to limitations in

	C old gas, LF(M4_function_n,oop)-L(0a)-3 cannot be put into the leal

	call	L(0a)

L(0a):	leal	(%eax,%eax,8),%eax

	addl	(%esp),%eax

	addl	$L(oop)-L(0a)-3,%eax

	addl	$4,%esp

',`

	C Calculate start address in loop for non-PIC.

	leal	L(oop)-3(%eax,%eax,8),%eax

')

	C These lines initialize carry from the 5th parameter.  Should be

	C possible to simplify.

	pushl	%ebp		FRAME_pushl()

	movl	PARAM_CARRY,%ebp

	shrl	%ebp			C shift bit 0 into carry

	popl	%ebp		FRAME_popl()

	jmp	*%eax			C jump into loop

EPILOGUE()

	ALIGN(16)

PROLOGUE(M4_function_n)

deflit(`FRAME',0)

	pushl	%edi		FRAME_pushl()

	pushl	%esi		FRAME_pushl()

	movl	PARAM_DST,%edi

	movl	PARAM_SRC1,%esi

	movl	PARAM_SRC2,%edx

	movl	PARAM_SIZE,%ecx

	movl	%ecx,%eax

	shrl	$3,%ecx			C compute count for unrolled loop

	negl	%eax

	andl	$7,%eax			C get index where to start loop

	jz	L(oop)			C necessary special case for 0

	incl	%ecx			C adjust loop count

	shll	$2,%eax			C adjustment for pointers...

	subl	%eax,%edi		C ... since they are offset ...

	subl	%eax,%esi		C ... by a constant when we ...

	subl	%eax,%edx		C ... enter the loop

	shrl	$2,%eax			C restore previous value

ifdef(`PIC',`

	C Calculate start address in loop for PIC.  Due to limitations in

	C some assemblers, L(oop)-L(0b)-3 cannot be put into the leal

	call	L(0b)

L(0b):	leal	(%eax,%eax,8),%eax

	addl	(%esp),%eax

	addl	$L(oop)-L(0b)-3,%eax

	addl	$4,%esp

',`

	C Calculate start address in loop for non-PIC.

	leal	L(oop)-3(%eax,%eax,8),%eax

')

	jmp	*%eax			C jump into loop

L(oopgo):

	pushl	%ebp		FRAME_pushl()

	movl	PARAM_CARRY,%ebp

	shrl	%ebp			C shift bit 0 into carry

	popl	%ebp		FRAME_popl()

	ALIGN(16)

L(oop):	movl	(%esi),%eax

	M4_inst	(%edx),%eax

	movl	%eax,(%edi)

	movl	4(%esi),%eax

	M4_inst	4(%edx),%eax

	movl	%eax,4(%edi)

	movl	8(%esi),%eax

	M4_inst	8(%edx),%eax

	movl	%eax,8(%edi)

	movl	12(%esi),%eax

	M4_inst	12(%edx),%eax

	movl	%eax,12(%edi)

	movl	16(%esi),%eax

	M4_inst	16(%edx),%eax

	movl	%eax,16(%edi)

	movl	20(%esi),%eax

	M4_inst	20(%edx),%eax

	movl	%eax,20(%edi)

	movl	24(%esi),%eax

	M4_inst	24(%edx),%eax

	movl	%eax,24(%edi)

	movl	28(%esi),%eax

	M4_inst	28(%edx),%eax

	movl	%eax,28(%edi)

	leal	32(%edi),%edi

	leal	32(%esi),%esi

	leal	32(%edx),%edx

	decl	%ecx

	jnz	L(oop)

	sbbl	%eax,%eax

	negl	%eax

	popl	%esi

	popl	%edi

	ret

EPILOGUE()