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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /sysdeps/rs6000/mul_1.s
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
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diff --git a/sysdeps/rs6000/mul_1.s b/sysdeps/rs6000/mul_1.s
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-# IBM POWER __mpn_mul_1 -- Multiply a limb vector with a limb and store
-# the result in a second limb vector.
-
-# Copyright (C) 1992, 1994 Free Software Foundation, Inc.
-
-# This file is part of the GNU MP Library.
-
-# The GNU MP 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 MP 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 MP Library; see the file COPYING.LIB.  If not, write to
-# the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-# MA 02111-1307, USA.
-
-
-# INPUT PARAMETERS
-# res_ptr	r3
-# s1_ptr	r4
-# size		r5
-# s2_limb	r6
-
-# The RS/6000 has no unsigned 32x32->64 bit multiplication instruction.  To
-# obtain that operation, we have to use the 32x32->64 signed multiplication
-# instruction, and add the appropriate compensation to the high limb of the
-# result.  We add the multiplicand if the multiplier has its most significant
-# bit set, and we add the multiplier if the multiplicand has its most
-# significant bit set.  We need to preserve the carry flag between each
-# iteration, so we have to compute the compensation carefully (the natural,
-# srai+and doesn't work).  Since the POWER architecture has a branch unit
-# we can branch in zero cycles, so that's how we perform the additions.
-
-	.toc
-	.csect .__mpn_mul_1[PR]
-	.align 2
-	.globl __mpn_mul_1
-	.globl .__mpn_mul_1
-	.csect __mpn_mul_1[DS]
-__mpn_mul_1:
-	.long .__mpn_mul_1[PR], TOC[tc0], 0
-	.csect .__mpn_mul_1[PR]
-.__mpn_mul_1:
-
-	cal	3,-4(3)
-	l	0,0(4)
-	cmpi	0,6,0
-	mtctr	5
-	mul	9,0,6
-	srai	7,0,31
-	and	7,7,6
-	mfmq	8
-	ai	0,0,0		# reset carry
-	cax	9,9,7
-	blt	Lneg
-Lpos:	bdz	Lend
-Lploop:	lu	0,4(4)
-	stu	8,4(3)
-	cmpi	0,0,0
-	mul	10,0,6
-	mfmq	0
-	ae	8,0,9
-	bge	Lp0
-	cax	10,10,6		# adjust high limb for negative limb from s1
-Lp0:	bdz	Lend0
-	lu	0,4(4)
-	stu	8,4(3)
-	cmpi	0,0,0
-	mul	9,0,6
-	mfmq	0
-	ae	8,0,10
-	bge	Lp1
-	cax	9,9,6		# adjust high limb for negative limb from s1
-Lp1:	bdn	Lploop
-	b	Lend
-
-Lneg:	cax	9,9,0
-	bdz	Lend
-Lnloop:	lu	0,4(4)
-	stu	8,4(3)
-	cmpi	0,0,0
-	mul	10,0,6
-	cax	10,10,0		# adjust high limb for negative s2_limb
-	mfmq	0
-	ae	8,0,9
-	bge	Ln0
-	cax	10,10,6		# adjust high limb for negative limb from s1
-Ln0:	bdz	Lend0
-	lu	0,4(4)
-	stu	8,4(3)
-	cmpi	0,0,0
-	mul	9,0,6
-	cax	9,9,0		# adjust high limb for negative s2_limb
-	mfmq	0
-	ae	8,0,10
-	bge	Ln1
-	cax	9,9,6		# adjust high limb for negative limb from s1
-Ln1:	bdn	Lnloop
-	b	Lend
-
-Lend0:	cal	9,0(10)
-Lend:	st	8,4(3)
-	aze	3,9
-	br