110 lines
2.3 KiB
NASM
110 lines
2.3 KiB
NASM
dnl AMD64 mpn_rshift
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dnl Copyright 2008 Jason Moxham
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dnl This file is part of the MPIR Library.
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dnl The MPIR 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 MPIR 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 MPIR 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 (rdi,rdx)=(rsi,rdx)>>rcx
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C rax=carry
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ASM_START()
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PROLOGUE(mpn_rshift)
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mov $64,%eax
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lea -32(%rsi,%rdx,8),%rsi
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lea -32(%rdi,%rdx,8),%rdi
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sub %rcx,%rax
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movq %rcx,%mm0
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mov $4,%r8d
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sub %rdx,%r8
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movq %rax,%mm1
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movq (%rsi,%r8,8),%mm5
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movq %mm5,%mm3
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psllq %mm1,%mm5
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movq %mm5,%rax
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psrlq %mm0,%mm3
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jnc skiploop
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ALIGN(16)
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loop:
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movq 8(%rsi,%r8,8),%mm2
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movq %mm2,%mm4
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psllq %mm1,%mm2
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por %mm2,%mm3
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movq %mm3,(%rdi,%r8,8)
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psrlq %mm0,%mm4
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movq 16(%rsi,%r8,8),%mm5
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movq %mm5,%mm3
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psllq %mm1,%mm5
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por %mm5,%mm4
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movq %mm4,8(%rdi,%r8,8)
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psrlq %mm0,%mm3
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C got room here for another jump out , if we can arrange our r8 to be
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C slightly different , so we can use a jz or jp here
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movq 24(%rsi,%r8,8),%mm2
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movq %mm2,%mm4
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psllq %mm1,%mm2
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por %mm2,%mm3
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movq %mm3,16(%rdi,%r8,8)
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psrlq %mm0,%mm4
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movq 32(%rsi,%r8,8),%mm5
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movq %mm5,%mm3
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psllq %mm1,%mm5
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por %mm5,%mm4
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movq %mm4,24(%rdi,%r8,8)
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psrlq %mm0,%mm3
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add $4,%r8
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jnc loop
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skiploop:
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test $2,%r8
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jnz next
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movq 8(%rsi,%r8,8),%mm2
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movq %mm2,%mm4
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psllq %mm1,%mm2
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por %mm2,%mm3
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movq %mm3,(%rdi,%r8,8)
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psrlq %mm0,%mm4
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movq 16(%rsi,%r8,8),%mm5
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movq %mm5,%mm3
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psllq %mm1,%mm5
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por %mm5,%mm4
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movq %mm4,8(%rdi,%r8,8)
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psrlq %mm0,%mm3
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add $2,%r8
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next:
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test $1,%r8
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jnz end
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movq 8(%rsi,%r8,8),%mm2
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movq %mm2,%mm4
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psllq %mm1,%mm2
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por %mm2,%mm3
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movq %mm3,(%rdi,%r8,8)
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psrlq %mm0,%mm4
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movq %mm4,8(%rdi,%r8,8)
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emms
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ret
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end:
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movq %mm3,(%rdi,%r8,8)
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emms
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ret
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EPILOGUE()
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