com.asm
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上传日期:2022-08-06
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- dnl PowerPC 750 mpn_com -- mpn bitwise one's complement
- dnl Copyright 2002, 2003 Free Software Foundation, Inc.
- dnl
- dnl This file is part of the GNU MP Library.
- dnl
- dnl The GNU MP Library is free software; you can redistribute it and/or
- dnl modify it under the terms of the GNU Lesser General Public License as
- dnl published by the Free Software Foundation; either version 3 of the
- dnl License, or (at your option) any later version.
- dnl
- dnl The GNU MP Library is distributed in the hope that it will be useful,
- dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
- dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- dnl Lesser General Public License for more details.
- dnl
- 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/.
- include(`../config.m4')
- C cycles/limb
- C 603e: ?
- C 604e: 3.0
- C 75x (G3): 2.0
- C 7400,7410 (G4): 2.0
- C 744x,745x (G4+): 3.0
- C void mpn_com (mp_ptr dst, mp_srcptr src, mp_size_t size);
- C
- C This loop form is necessary for the claimed speed.
- ASM_START()
- PROLOGUE(mpn_com)
- C r3 dst
- C r4 src
- C r5 size
- mtctr r5 C size
- lwz r5, 0(r4) C src low limb
- sub r4, r4, r3 C src-dst
- subi r3, r3, 4 C dst-4
- addi r4, r4, 8 C src-dst+8
- bdz L(one)
- L(top):
- C r3 &dst[i-1]
- C r4 src-dst
- C r5 src[i]
- C r6 scratch
- not r6, r5 C ~src[i]
- lwzx r5, r4,r3 C src[i+1]
- stwu r6, 4(r3) C dst[i]
- bdnz L(top)
- L(one):
- not r6, r5
- stw r6, 4(r3) C dst[size-1]
- blr
- EPILOGUE()