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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/add_n.s
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
downloadglibc-0ecb606cb6cf65de1d9fc8a919bceb4be476c602.tar.gz
2.5-18.1
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-# 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