111 lines
2.2 KiB
NASM
111 lines
2.2 KiB
NASM
dnl AMD64 mpn_rshift1
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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)>>1
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C rax=carry
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ASM_START()
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PROLOGUE(mpn_rshift1)
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# Version 1.0.4
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xor %rax,%rax
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lea -8(%rsi,%rdx,8),%rsi
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lea -8(%rdi,%rdx,8),%rdi
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mov %rdx,%r11
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and $7,%r11
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inc %r11
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shr $3,%rdx
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# and clear carry flag
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cmp $0,%rdx
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jz next
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ALIGN(16)
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loop:
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mov (%rsi),%rcx
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mov -8(%rsi),%r8
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mov -16(%rsi),%r9
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mov -24(%rsi),%r10
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rcr $1,%rcx
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rcr $1,%r8
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rcr $1,%r9
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rcr $1,%r10
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mov %rcx,(%rdi)
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mov %r8,-8(%rdi)
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mov %r9,-16(%rdi)
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mov %r10,-24(%rdi)
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mov -32(%rsi),%rcx
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mov -40(%rsi),%r8
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mov -48(%rsi),%r9
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mov -56(%rsi),%r10
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rcr $1,%rcx
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rcr $1,%r8
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rcr $1,%r9
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rcr $1,%r10
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mov %rcx,-32(%rdi)
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mov %r8,-40(%rdi)
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mov %r9,-48(%rdi)
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mov %r10,-56(%rdi)
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lea -64(%rsi),%rsi
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dec %rdx
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lea -64(%rdi),%rdi
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jnz loop
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next:
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dec %r11
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jz end
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# Could suffer cache-bank conflicts in this tail part
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mov (%rsi),%rcx
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rcr $1,%rcx
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mov %rcx,(%rdi)
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dec %r11
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jz end
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mov -8(%rsi),%rcx
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rcr $1,%rcx
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mov %rcx,-8(%rdi)
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dec %r11
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jz end
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mov -16(%rsi),%rcx
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rcr $1,%rcx
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mov %rcx,-16(%rdi)
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dec %r11
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jz end
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mov -24(%rsi),%rcx
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rcr $1,%rcx
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mov %rcx,-24(%rdi)
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dec %r11
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jz end
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mov -32(%rsi),%rcx
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rcr $1,%rcx
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mov %rcx,-32(%rdi)
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dec %r11
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jz end
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mov -40(%rsi),%rcx
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rcr $1,%rcx
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mov %rcx,-40(%rdi)
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dec %r11
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jz end
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mov -48(%rsi),%rcx
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rcr $1,%rcx
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mov %rcx,-48(%rdi)
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end:
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rcr $1,%rax
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ret
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EPILOGUE()
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