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-rw-r--r--sysdeps/alpha/rshift.s107
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diff --git a/sysdeps/alpha/rshift.s b/sysdeps/alpha/rshift.s
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- # Alpha 21064 __mpn_rshift --
-
- # Copyright (C) 1994, 1995 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	r16
- # s1_ptr	r17
- # size		r18
- # cnt		r19
-
- # This code runs at 4.8 cycles/limb on the 21064.  With infinite unrolling,
- # it would take 4 cycles/limb.  It should be possible to get down to 3
- # cycles/limb since both ldq and stq can be paired with the other used
- # instructions.  But there are many restrictions in the 21064 pipeline that
- # makes it hard, if not impossible, to get down to 3 cycles/limb:
-
- # 1. ldq has a 3 cycle delay, srl and sll have a 2 cycle delay.
- # 2. Only aligned instruction pairs can be paired.
- # 3. The store buffer or silo might not be able to deal with the bandwidth.
-
-	.set	noreorder
-	.set	noat
-.text
-	.align	3
-	.globl	__mpn_rshift
-	.ent	__mpn_rshift
-__mpn_rshift:
-	.frame	$30,0,$26,0
-
-	ldq	$4,0($17)	# load first limb
-	addq	$17,8,$17
-	subq	$31,$19,$7
-	subq	$18,1,$18
-	and	$18,4-1,$20	# number of limbs in first loop
-	sll	$4,$7,$0	# compute function result
-
-	beq	$20,.L0
-	subq	$18,$20,$18
-
-	.align	3
-.Loop0:
-	ldq	$3,0($17)
-	addq	$16,8,$16
-	addq	$17,8,$17
-	subq	$20,1,$20
-	srl	$4,$19,$5
-	sll	$3,$7,$6
-	bis	$3,$3,$4
-	bis	$5,$6,$8
-	stq	$8,-8($16)
-	bne	$20,.Loop0
-
-.L0:	beq	$18,.Lend
-
-	.align	3
-.Loop:	ldq	$3,0($17)
-	addq	$16,32,$16
-	subq	$18,4,$18
-	srl	$4,$19,$5
-	sll	$3,$7,$6
-
-	ldq	$4,8($17)
-	srl	$3,$19,$1
-	bis	$5,$6,$8
-	stq	$8,-32($16)
-	sll	$4,$7,$2
-
-	ldq	$3,16($17)
-	srl	$4,$19,$5
-	bis	$1,$2,$8
-	stq	$8,-24($16)
-	sll	$3,$7,$6
-
-	ldq	$4,24($17)
-	srl	$3,$19,$1
-	bis	$5,$6,$8
-	stq	$8,-16($16)
-	sll	$4,$7,$2
-
-	addq	$17,32,$17
-	bis	$1,$2,$8
-	stq	$8,-8($16)
-
-	bgt	$18,.Loop
-
-.Lend:	srl	$4,$19,$8
-	stq	$8,0($16)
-	ret	$31,($26),1
-	.end	__mpn_rshift