add_n.asm
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上传日期:2022-08-06
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- dnl IBM POWER mpn_add_n -- Add two limb vectors of equal, non-zero length.
- dnl Copyright 1992, 1994, 1995, 1996, 1999, 2000, 2001, 2005 Free Software
- dnl 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/.
- dnl INPUT PARAMETERS
- dnl res_ptr r3
- dnl s1_ptr r4
- dnl s2_ptr r5
- dnl size r6
- include(`../config.m4')
- ASM_START()
- PROLOGUE(mpn_add_n)
- andil. 10,6,1 C odd or even number of limbs?
- l 8,0(4) C load least significant s1 limb
- l 0,0(5) C load least significant s2 limb
- cal 3,-4(3) C offset res_ptr, it's updated before it's used
- sri 10,6,1 C count for unrolled loop
- a 7,0,8 C add least significant limbs, set cy
- mtctr 10 C copy count into CTR
- beq 0,Leven C branch if even # of limbs (# of limbs >= 2)
- C We have an odd # of limbs. Add the first limbs separately.
- cmpi 1,10,0 C is count for unrolled loop zero?
- bc 4,6,L1 C bne cr1,L1 (misassembled by gas)
- st 7,4(3)
- aze 3,10 C use the fact that r10 is zero...
- br C return
- C We added least significant limbs. Now reload the next limbs to enter loop.
- L1: lu 8,4(4) C load s1 limb and update s1_ptr
- lu 0,4(5) C load s2 limb and update s2_ptr
- stu 7,4(3)
- ae 7,0,8 C add limbs, set cy
- Leven: lu 9,4(4) C load s1 limb and update s1_ptr
- lu 10,4(5) C load s2 limb and update s2_ptr
- bdz Lend C If done, skip loop
- Loop: lu 8,4(4) C load s1 limb and update s1_ptr
- lu 0,4(5) C load s2 limb and update s2_ptr
- ae 11,10,9 C add previous limbs with cy, set cy
- stu 7,4(3) C
- lu 9,4(4) C load s1 limb and update s1_ptr
- lu 10,4(5) C load s2 limb and update s2_ptr
- ae 7,0,8 C add previous limbs with cy, set cy
- stu 11,4(3) C
- bdn Loop C decrement CTR and loop back
- Lend: ae 11,10,9 C add limbs with cy, set cy
- st 7,4(3) C
- st 11,8(3) C
- lil 3,0 C load cy into ...
- aze 3,3 C ... return value register
- br
- EPILOGUE(mpn_add_n)