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dnl PowerPC 750 mpn_com_n -- 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_n (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_n)
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()
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