1dnl PowerPC 750 mpn_com -- mpn bitwise one's complement 2 3dnl Copyright 2002, 2003 Free Software Foundation, Inc. 4 5dnl This file is part of the GNU MP Library. 6dnl 7dnl The GNU MP Library is free software; you can redistribute it and/or modify 8dnl it under the terms of either: 9dnl 10dnl * the GNU Lesser General Public License as published by the Free 11dnl Software Foundation; either version 3 of the License, or (at your 12dnl option) any later version. 13dnl 14dnl or 15dnl 16dnl * the GNU General Public License as published by the Free Software 17dnl Foundation; either version 2 of the License, or (at your option) any 18dnl later version. 19dnl 20dnl or both in parallel, as here. 21dnl 22dnl The GNU MP Library is distributed in the hope that it will be useful, but 23dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 24dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 25dnl for more details. 26dnl 27dnl You should have received copies of the GNU General Public License and the 28dnl GNU Lesser General Public License along with the GNU MP Library. If not, 29dnl see https://www.gnu.org/licenses/. 30 31include(`../config.m4') 32 33 34C cycles/limb 35C 603e: ? 36C 604e: 3.0 37C 75x (G3): 2.0 38C 7400,7410 (G4): 2.0 39C 744x,745x (G4+): 3.0 40 41C void mpn_com (mp_ptr dst, mp_srcptr src, mp_size_t size); 42C 43C This loop form is necessary for the claimed speed. 44 45ASM_START() 46PROLOGUE(mpn_com) 47 48 C r3 dst 49 C r4 src 50 C r5 size 51 52 mtctr r5 C size 53 lwz r5, 0(r4) C src low limb 54 55 sub r4, r4, r3 C src-dst 56 subi r3, r3, 4 C dst-4 57 58 addi r4, r4, 8 C src-dst+8 59 bdz L(one) 60 61L(top): 62 C r3 &dst[i-1] 63 C r4 src-dst 64 C r5 src[i] 65 C r6 scratch 66 67 not r6, r5 C ~src[i] 68 lwzx r5, r4,r3 C src[i+1] 69 70 stwu r6, 4(r3) C dst[i] 71 bdnz L(top) 72 73L(one): 74 not r6, r5 75 76 stw r6, 4(r3) C dst[size-1] 77 blr 78 79EPILOGUE() 80