umul_ppmm.asm

a very popular packet of cryptography tools,it encloses the most common used algorithm and protocols

dnl  Copyright 1999, 2000, 2002, 2003 Free Software Foundation, Inc.

dnl  This file is part of the GNU MP Library.

dnl  The GNU MP Library is free software; you can redistribute it and/or modify
dnl  it under the terms of the GNU Lesser General Public License as published by
dnl  the Free Software Foundation; either version 2.1 of the License, or (at your
dnl  option) any later version.

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 Lesser General Public
dnl  License for more details.

dnl  You should have received a copy of the GNU Lesser General Public License
dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
dnl  MA 02111-1307, USA.


dnl  Optimizations:
dnl  * Avoid skip instructions
dnl  * Put carry-generating and carry-consuming insns consecutively
dnl  * Don't allocate any stack, "home" positions for parameteters could be
dnl    used.

include(`../config.m4')

define(`p0',`%r28')
define(`p1',`%r29')
define(`t32',`%r19')
define(`t0',`%r20')
define(`t1',`%r21')
define(`x',`%r22')
define(`m0',`%r23')
define(`m1',`%r24')

ifdef(`HAVE_ABI_2_0w',
`	.level	2.0w
',`	.level	2.0
')
PROLOGUE(mpn_umul_ppmm)
	ldo		128(%r30),%r30
ifdef(`HAVE_ABI_2_0w',
`	std		%r26,-64(%r30)
	std		%r25,-56(%r30)
	copy		%r24,%r31
',`
	depd		%r25,31,32,%r26
	std		%r26,-64(%r30)
	depd		%r23,31,32,%r24
	std		%r24,-56(%r30)
	ldw		-180(%r30),%r31
')

	fldd		-64(%r30),%fr4
	fldd		-56(%r30),%fr5

	xmpyu		%fr5R,%fr4R,%fr6
	fstd		%fr6,-128(%r30)
	xmpyu		%fr5R,%fr4L,%fr7
	fstd		%fr7,-120(%r30)
	xmpyu		%fr5L,%fr4R,%fr8
	fstd		%fr8,-112(%r30)
	xmpyu		%fr5L,%fr4L,%fr9
	fstd		%fr9,-104(%r30)

	depdi,z		1,31,1,t32		C t32 = 2^32

	ldd		-128(%r30),p0		C lo = low 64 bit of product
	ldd		-120(%r30),m0		C m0 = mid0 64 bit of product
	ldd		-112(%r30),m1		C m1 = mid1 64 bit of product
	ldd		-104(%r30),p1		C hi = high 64 bit of product

	add,l,*nuv	m0,m1,x			C x = m1+m0
	 add,l		t32,p1,p1		C propagate carry to mid of p1
	depd,z		x,31,32,t0		C lo32(m1+m0)
	add		t0,p0,p0
	extrd,u		x,31,32,t1		C hi32(m1+m0)
	add,dc		t1,p1,p1

	std		p0,0(%r31)		C store low half of product
ifdef(`HAVE_ABI_2_0w',
`	copy		p1,%r28			C return val in %r28
',`	extrd,u		p1,31,32,%r28		C return val in %r28,%r29
')
	bve		(%r2)
	ldo		-128(%r30),%r30
EPILOGUE(mpn_umul_ppmm)