2009-08-10 22:27:30 -04:00
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dnl mpn_rshift
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dnl Copyright 2009 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 ret mpn_rshift(mp_ptr,mp_ptr,mp_size_t,ul)
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C rax rdi, rsi, rdx
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ASM_START()
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PROLOGUE(mpn_rshift)
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2009-10-15 14:21:27 -04:00
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C below really a movq
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movd %rcx,%mm0
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2009-08-10 22:27:30 -04:00
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mov $64,%rax
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sub %rcx,%rax
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2009-10-15 14:21:27 -04:00
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C below really a movq
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movd %rax,%mm1
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2009-08-10 22:27:30 -04:00
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mov $4,%rcx
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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 %rdx,%rcx
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movq (%rsi,%rcx,8),%mm5
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movq %mm5,%mm3
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psllq %mm1,%mm5
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2009-10-15 14:21:27 -04:00
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C below really a movq
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movd %mm5,%rax
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2009-08-10 22:27:30 -04:00
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psrlq %mm0,%mm3
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jge skiplp
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ALIGN(16)
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lp:
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movq 8(%rsi,%rcx,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,%rcx,8)
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psrlq %mm0,%mm4
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movq 16(%rsi,%rcx,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,%rcx,8)
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psrlq %mm0,%mm3
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movq 24(%rsi,%rcx,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 32(%rsi,%rcx,8),%mm5
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movq %mm3,16(%rdi,%rcx,8)
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psrlq %mm0,%mm4
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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,%rcx,8)
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psrlq %mm0,%mm3
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add $4,%rcx
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jnc lp
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skiplp:
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cmp $2,%rcx
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ja case0
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jz case1
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jp case2
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case3:
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movq 8(%rsi,%rcx,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,%rcx,8)
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psrlq %mm0,%mm4
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movq 16(%rsi,%rcx,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,%rcx,8)
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psrlq %mm0,%mm3
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movq 24(%rsi,%rcx,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,%rcx,8)
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psrlq %mm0,%mm4
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movq %mm4,24(%rdi,%rcx,8)
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emms
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ret
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ALIGN(16)
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case2:
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movq 8(%rsi,%rcx,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,%rcx,8)
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psrlq %mm0,%mm4
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movq 16(%rsi,%rcx,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,%rcx,8)
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psrlq %mm0,%mm3
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movq %mm3,16(%rdi,%rcx,8)
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emms
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ret
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ALIGN(16)
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case1:
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movq 8(%rsi,%rcx,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,%rcx,8)
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psrlq %mm0,%mm4
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movq %mm4,8(%rdi,%rcx,8)
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emms
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ret
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ALIGN(16)
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case0:
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movq %mm3,(%rdi,%rcx,8)
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emms
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ret
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EPILOGUE()
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