56 lines
1.5 KiB
NASM
56 lines
1.5 KiB
NASM
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dnl AMD64 mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
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dnl store difference in a third limb vector.
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dnl Copyright 2004 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C cycles/limb
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C Hammer: 3.0
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C INPUT PARAMETERS
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C rp rdi
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C up rsi
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C vp rdx
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C n rcx
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ASM_START()
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PROLOGUE(mpn_sub_n)
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leaq (%rsi,%rcx,8), %rsi
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leaq (%rdi,%rcx,8), %rdi
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leaq (%rdx,%rcx,8), %rdx
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negq %rcx
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xorl %eax, %eax C clear cy
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ALIGN(4) C minimal alignment for claimed speed
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.Loop: movq (%rsi,%rcx,8), %rax
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movq (%rdx,%rcx,8), %r10
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sbbq %r10, %rax
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movq %rax, (%rdi,%rcx,8)
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incq %rcx
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jne .Loop
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movq %rcx, %rax C zero %rax
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adcq %rax, %rax
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ret
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EPILOGUE()
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