77 lines
1.7 KiB
NASM
77 lines
1.7 KiB
NASM
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dnl AMD64 mpn_rshift
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dnl Copyright 2004, 2006 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 3 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. If not, see http://www.gnu.org/licenses/.
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include(`../config.m4')
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C cycles/limb
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C AMD K8: 2.5
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C Intel P4: 4
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C Intel Core 2: 2.4
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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 n rdx
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C cnt rcx
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ASM_START()
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PROLOGUE(mpn_rshift)
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movq (%rsi), %mm7
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movd %ecx, %mm1
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movl $64, %eax
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subl %ecx, %eax
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movd %eax, %mm0
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movq %mm7, %mm3
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psllq %mm0, %mm7
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.byte 0x48, 0x0f, 0x7e, 0xf8 C movd %mm7, %rax
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leaq (%rsi,%rdx,8), %rsi
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leaq (%rdi,%rdx,8), %rdi
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negq %rdx
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addq $2, %rdx
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jg L(endo)
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ALIGN(8) C minimal alignment for claimed speed
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L(loop):
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movq -8(%rsi,%rdx,8), %mm6
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movq %mm6, %mm2
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psllq %mm0, %mm6
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psrlq %mm1, %mm3
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por %mm6, %mm3
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movq %mm3, -16(%rdi,%rdx,8)
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je L(ende)
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movq (%rsi,%rdx,8), %mm7
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movq %mm7, %mm3
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psllq %mm0, %mm7
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psrlq %mm1, %mm2
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por %mm7, %mm2
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movq %mm2, -8(%rdi,%rdx,8)
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addq $2, %rdx
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jle L(loop)
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L(endo):
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movq %mm3, %mm2
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L(ende):
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psrlq %mm1, %mm2
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movq %mm2, -8(%rdi)
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emms
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ret
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EPILOGUE()
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