数学计算

开发平台：
Unix_Linux

lshift.asm：源码内容
							dnl  Alpha mpn_lshift -- Shift a number left.
dnl  Copyright 1994, 1995, 2000, 2003, 2009 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
dnl  by the Free Software Foundation; either version 3 of the License, or (at
dnl  your 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.  If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C      cycles/limb
C EV4:     ?
C EV5:     3.25
C EV6:     1.75
C  INPUT PARAMETERS
C  rp	r16
C  up	r17
C  n	r18
C  cnt	r19
ASM_START()
PROLOGUE(mpn_lshift)
	s8addq	r18,r17,r17	C make r17 point at end of s1
	ldq	r4,-8(r17)	C load first limb
	subq	r31,r19,r20
	s8addq	r18,r16,r16	C make r16 point at end of RES
	subq	r18,1,r18
	and	r18,4-1,r28	C number of limbs in first loop
	srl	r4,r20,r0	C compute function result
	beq	r28,L(L0)
	subq	r18,r28,r18
	ALIGN(8)
L(top0):
	ldq	r3,-16(r17)
	subq	r16,8,r16
	sll	r4,r19,r5
	subq	r17,8,r17
	subq	r28,1,r28
	srl	r3,r20,r6
	bis	r3,r3,r4
	bis	r5,r6,r8
	stq	r8,0(r16)
	bne	r28,L(top0)
L(L0):	sll	r4,r19,r24
	beq	r18,L(end)
C warm up phase 1
	ldq	r1,-16(r17)
	subq	r18,4,r18
	ldq	r2,-24(r17)
	ldq	r3,-32(r17)
	ldq	r4,-40(r17)
C warm up phase 2
	srl	r1,r20,r7
	sll	r1,r19,r21
	srl	r2,r20,r8
	beq	r18,L(end1)
	ldq	r1,-48(r17)
	sll	r2,r19,r22
	ldq	r2,-56(r17)
	srl	r3,r20,r5
	bis	r7,r24,r7
	sll	r3,r19,r23
	bis	r8,r21,r8
	srl	r4,r20,r6
	ldq	r3,-64(r17)
	sll	r4,r19,r24
	ldq	r4,-72(r17)
	subq	r18,4,r18
	beq	r18,L(end2)
	ALIGN(16)
C main loop
L(top):	stq	r7,-8(r16)
	bis	r5,r22,r5
	stq	r8,-16(r16)
	bis	r6,r23,r6
	srl	r1,r20,r7
	subq	r18,4,r18
	sll	r1,r19,r21
	unop	C ldq	r31,-96(r17)
	srl	r2,r20,r8
	ldq	r1,-80(r17)
	sll	r2,r19,r22
	ldq	r2,-88(r17)
	stq	r5,-24(r16)
	bis	r7,r24,r7
	stq	r6,-32(r16)
	bis	r8,r21,r8
	srl	r3,r20,r5
	unop	C ldq	r31,-96(r17)
	sll	r3,r19,r23
	subq	r16,32,r16
	srl	r4,r20,r6
	ldq	r3,-96(r17)
	sll	r4,r19,r24
	ldq	r4,-104(r17)
	subq	r17,32,r17
	bne	r18,L(top)
C cool down phase 2/1
L(end2):
	stq	r7,-8(r16)
	bis	r5,r22,r5
	stq	r8,-16(r16)
	bis	r6,r23,r6
	srl	r1,r20,r7
	sll	r1,r19,r21
	srl	r2,r20,r8
	sll	r2,r19,r22
	stq	r5,-24(r16)
	bis	r7,r24,r7
	stq	r6,-32(r16)
	bis	r8,r21,r8
	srl	r3,r20,r5
	sll	r3,r19,r23
	srl	r4,r20,r6
	sll	r4,r19,r24
C cool down phase 2/2
	stq	r7,-40(r16)
	bis	r5,r22,r5
	stq	r8,-48(r16)
	bis	r6,r23,r6
	stq	r5,-56(r16)
	stq	r6,-64(r16)
C cool down phase 2/3
	stq	r24,-72(r16)
	ret	r31,(r26),1
C cool down phase 1/1
L(end1):
	sll	r2,r19,r22
	srl	r3,r20,r5
	bis	r7,r24,r7
	sll	r3,r19,r23
	bis	r8,r21,r8
	srl	r4,r20,r6
	sll	r4,r19,r24
C cool down phase 1/2
	stq	r7,-8(r16)
	bis	r5,r22,r5
	stq	r8,-16(r16)
	bis	r6,r23,r6
	stq	r5,-24(r16)
	stq	r6,-32(r16)
	stq	r24,-40(r16)
	ret	r31,(r26),1
L(end):	stq	r24,-8(r16)
	ret	r31,(r26),1
EPILOGUE(mpn_lshift)
ASM_END()

						