[Gmp-commit] /var/hg/gmp: Add ARM mpn_lshiftc.

[mercurial at gmplib.org]

details:   /var/hg/gmp/rev/da34816982bf
changeset: 15045:da34816982bf
user:      Torbjorn Granlund <tege at gmplib.org>
date:      Sat Jun 02 19:09:24 2012 +0200
description:
Add ARM mpn_lshiftc.

diffstat:

 ChangeLog           |   4 ++
 mpn/arm/lshiftc.asm |  83 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 87 insertions(+), 0 deletions(-)

diffs (98 lines):

diff -r 21c17d4c7a2b -r da34816982bf ChangeLog
--- a/ChangeLog	Sat Jun 02 19:03:06 2012 +0200
+++ b/ChangeLog	Sat Jun 02 19:09:24 2012 +0200
@@ -1,3 +1,7 @@
+2012-06-02  Torbjorn Granlund  <tege at gmplib.org>
+
+	* mpn/arm/lshiftc.asm: New file.
+
 2012-06-01  Torbjorn Granlund  <tege at gmplib.org>
 
 	* mpn/arm/aorslsh1_n.asm: Use cmp/cmn instead of subs/adds in more
diff -r 21c17d4c7a2b -r da34816982bf mpn/arm/lshiftc.asm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mpn/arm/lshiftc.asm	Sat Jun 02 19:09:24 2012 +0200
@@ -0,0 +1,83 @@
+dnl  ARM mpn_lshiftc.
+
+dnl  Contributed to the GNU project by Torbjorn Granlund.
+
+dnl  Copyright 2012 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 StrongARM	 ?
+C XScale	 ?
+C Cortex-A8	 ?
+C Cortex-A9	 4.0
+C Cortex-A15	 ?
+
+define(`rp',  `r0')
+define(`up',  `r1')
+define(`n',   `r2')
+define(`cnt', `r3')
+define(`tnc', `r12')
+
+ASM_START()
+PROLOGUE(mpn_lshiftc)
+	add	up, up, n, lsl #2
+	push	{r4, r6, r7, r8}
+	ldr	r4, [up, #-4]!
+	add	rp, rp, n, lsl #2
+	rsb	tnc, cnt, #32
+	mvn	r6, r4
+
+	lsl	r7, r6, cnt
+	tst	n, #1
+	beq	L(evn)			C n even
+
+L(odd):	subs	n, n, #2
+	bcc	L(1)			C n = 1
+	ldr	r8, [up, #-4]!
+	mvn	r8, r8
+	b	L(mid)
+
+L(evn):	ldr	r6, [up, #-4]!
+	mvn	r6, r6
+	subs	n, n, #2
+	beq	L(end)
+
+L(top):	ldr	r8, [up, #-4]!
+	orr	r7, r7, r6, lsr tnc
+	str	r7, [rp, #-4]!
+	mvn	r8, r8
+	lsl	r7, r6, cnt
+L(mid):	ldr	r6, [up, #-4]!
+	orr	r7, r7, r8, lsr tnc
+	str	r7, [rp, #-4]!
+	mvn	r6, r6
+	lsl	r7, r8, cnt
+	subs	n, n, #2
+	bgt	L(top)
+
+L(end):	orr	r7, r7, r6, lsr tnc
+	str	r7, [rp, #-4]!
+	lsl	r7, r6, cnt
+L(1):	mvn	r6, #0
+	orr	r7, r7, r6, lsr tnc
+	str	r7, [rp, #-4]
+	lsr	r0, r4, tnc
+	pop	{r4, r6, r7, r8}
+	bx	r14
+EPILOGUE()