From a334319f6530564d22e775935d9c91663623a1b4 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Wed, 22 Dec 2004 20:10:10 +0000
Subject: (CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.

---
 sysdeps/rs6000/add_n.s | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 sysdeps/rs6000/add_n.s

(limited to 'sysdeps/rs6000/add_n.s')

diff --git a/sysdeps/rs6000/add_n.s b/sysdeps/rs6000/add_n.s
new file mode 100644
index 0000000000..216874e7a4
--- /dev/null
+++ b/sysdeps/rs6000/add_n.s
@@ -0,0 +1,81 @@
+# IBM POWER __mpn_add_n -- Add two limb vectors of equal, non-zero length.
+
+# Copyright (C) 1992, 1994, 1995, 1996 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
+# s2_ptr	r5
+# size		r6
+
+	.toc
+	.extern __mpn_add_n[DS]
+	.extern .__mpn_add_n
+.csect [PR]
+	.align 2
+	.globl __mpn_add_n
+	.globl .__mpn_add_n
+	.csect __mpn_add_n[DS]
+__mpn_add_n:
+	.long .__mpn_add_n, TOC[tc0], 0
+	.csect [PR]
+.__mpn_add_n:
+	andil.	10,6,1		# odd or even number of limbs?
+	l	8,0(4)		# load least significant s1 limb
+	l	0,0(5)		# load least significant s2 limb
+	cal	3,-4(3)		# offset res_ptr, it's updated before it's used
+	sri	10,6,1		# count for unrolled loop
+	a	7,0,8		# add least significant limbs, set cy
+	mtctr	10		# copy count into CTR
+	beq	0,Leven		# branch if even # of limbs (# of limbs >= 2)
+
+# We have an odd # of limbs.  Add the first limbs separately.
+	cmpi	1,10,0		# is count for unrolled loop zero?
+	bne	1,L1		# branch if not
+	st	7,4(3)
+	aze	3,10		# use the fact that r10 is zero...
+	br			# return
+
+# We added least significant limbs.  Now reload the next limbs to enter loop.
+L1:	lu	8,4(4)		# load s1 limb and update s1_ptr
+	lu	0,4(5)		# load s2 limb and update s2_ptr
+	stu	7,4(3)
+	ae	7,0,8		# add limbs, set cy
+Leven:	lu	9,4(4)		# load s1 limb and update s1_ptr
+	lu	10,4(5)		# load s2 limb and update s2_ptr
+	bdz	Lend		# If done, skip loop
+
+Loop:	lu	8,4(4)		# load s1 limb and update s1_ptr
+	lu	0,4(5)		# load s2 limb and update s2_ptr
+	ae	11,9,10		# add previous limbs with cy, set cy
+	stu	7,4(3)		# 
+	lu	9,4(4)		# load s1 limb and update s1_ptr
+	lu	10,4(5)		# load s2 limb and update s2_ptr
+	ae	7,0,8		# add previous limbs with cy, set cy
+	stu	11,4(3)		# 
+	bdn	Loop		# decrement CTR and loop back
+
+Lend:	ae	11,9,10		# add limbs with cy, set cy
+	st	7,4(3)		# 
+	st	11,8(3)		# 
+	lil	3,0		# load cy into ...
+	aze	3,3		# ... return value register
+	br
-- 
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