71 lines
1.7 KiB
NASM
71 lines
1.7 KiB
NASM
dnl PowerPC 750 mpn_com_n -- mpn bitwise one's complement
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dnl Copyright 2002, 2003 Free Software Foundation, Inc.
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dnl
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public License as
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dnl published by the Free Software Foundation; either version 2.1 of the
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dnl License, or (at your option) any later version.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU Lesser General Public
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dnl License along with the GNU MP Library; see the file COPYING.LIB. If
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dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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dnl Fifth Floor, Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C cycles/limb
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C 603e: ?
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C 604e: 3.0
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C 75x (G3): 2.0
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C 7400,7410 (G4): 2.0
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C 744x,745x (G4+): 3.0
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C void mpn_com_n (mp_ptr dst, mp_srcptr src, mp_size_t size);
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C
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C This loop form is necessary for the claimed speed.
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ASM_START()
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PROLOGUE(mpn_com_n)
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C r3 dst
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C r4 src
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C r5 size
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mtctr r5 C size
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lwz r5, 0(r4) C src low limb
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sub r4, r4, r3 C src-dst
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subi r3, r3, 4 C dst-4
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addi r4, r4, 8 C src-dst+8
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bdz L(one)
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L(top):
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C r3 &dst[i-1]
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C r4 src-dst
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C r5 src[i]
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C r6 scratch
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not r6, r5 C ~src[i]
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lwzx r5, r4,r3 C src[i+1]
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stwu r6, 4(r3) C dst[i]
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bdnz L(top)
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L(one):
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not r6, r5
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stw r6, 4(r3) C dst[size-1]
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blr
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EPILOGUE()
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