2009-07-24 07:50:15 -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 mpn_rshift(mp_ptr rdi,mp_ptr rsi,mp_size_t rdx,mp_limb_t 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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2009-10-15 14:13:19 -04:00
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C // when n=1 mod4 seem to have different runtimes
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2009-07-24 07:50:15 -04:00
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push %rbx
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mov $4,%rbx
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lea -24(%rsi,%rdx,8),%rsi
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lea -24(%rdi,%rdx,8),%rdi
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sub %rdx,%rbx
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xor %rax,%rax
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mov -8(%rsi,%rbx,8),%rdx
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shrd %cl,%rdx,%rax
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cmp $0,%rbx
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jge skiplp
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ALIGN(16)
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lp:
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mov (%rsi,%rbx,8),%r8
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mov 24(%rsi,%rbx,8),%r11
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shrd %cl,%r8,%rdx
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mov 8(%rsi,%rbx,8),%r9
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shrd %cl,%r9,%r8
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mov %rdx,-8(%rdi,%rbx,8)
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mov %r8,(%rdi,%rbx,8)
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mov 16(%rsi,%rbx,8),%r10
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shrd %cl,%r10,%r9
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mov %r11,%rdx
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mov %r9,8(%rdi,%rbx,8)
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shrd %cl,%r11,%r10
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add $4,%rbx
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mov %r10,-16(%rdi,%rbx,8)
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jnc lp
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skiplp:
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cmp $2,%rbx
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ja case0
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je case1
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jp case2
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case3:
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mov (%rsi,%rbx,8),%r8
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shrd %cl,%r8,%rdx
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mov 8(%rsi,%rbx,8),%r9
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shrd %cl,%r9,%r8
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mov %rdx,-8(%rdi,%rbx,8)
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mov %r8,(%rdi,%rbx,8)
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mov 16(%rsi,%rbx,8),%r10
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shrd %cl,%r10,%r9
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mov %r9,8(%rdi,%rbx,8)
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shr %cl,%r10
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mov %r10,16(%rdi,%rbx,8)
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pop %rbx
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ret
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ALIGN(16)
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case2:
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mov (%rsi,%rbx,8),%r8
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shrd %cl,%r8,%rdx
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mov 8(%rsi,%rbx,8),%r9
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shrd %cl,%r9,%r8
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mov %rdx,-8(%rdi,%rbx,8)
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mov %r8,(%rdi,%rbx,8)
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shr %cl,%r9
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mov %r9,8(%rdi,%rbx,8)
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pop %rbx
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ret
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ALIGN(16)
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case1:
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mov (%rsi,%rbx,8),%r8
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shrd %cl,%r8,%rdx
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shr %cl,%r8
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mov %rdx,-8(%rdi,%rbx,8)
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mov %r8,(%rdi,%rbx,8)
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pop %rbx
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ret
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ALIGN(16)
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case0:
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shr %cl,%rdx
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mov %rdx,-8(%rdi,%rbx,8)
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pop %rbx
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ret
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EPILOGUE()
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