rshift.asm
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上传日期:2022-08-06
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- dnl x86-64 mpn_rshift optimized for Pentium 4.
- dnl Copyright 2003, 2005, 2007, 2008 Free Software Foundation, Inc.
- dnl
- dnl This file is part of the GNU MP Library.
- dnl
- dnl The GNU MP Library is free software; you can redistribute it and/or
- dnl modify it under the terms of the GNU Lesser General Public License as
- dnl published by the Free Software Foundation; either version 3 of the
- dnl License, or (at your option) any later version.
- dnl
- dnl The GNU MP Library is distributed in the hope that it will be useful,
- dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
- dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- dnl Lesser General Public License for more details.
- dnl
- dnl You should have received a copy of the GNU Lesser General Public License
- dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- include(`../config.m4')
- C cycles/limb
- C K8,K9: 2.5
- C K10: ?
- C P4: 3.29
- C P6-15 (Core2): 2.1 (fluctuates, presumably cache related)
- C P6-28 (Atom): 14.3
- C INPUT PARAMETERS
- define(`rp',`%rdi')
- define(`up',`%rsi')
- define(`n',`%rdx')
- define(`cnt',`%cl')
- ASM_START()
- TEXT
- ALIGN(32)
- PROLOGUE(mpn_rshift)
- mov (up), %rax
- movd %ecx, %mm4
- neg %ecx C put lsh count in cl
- and $63, %ecx
- movd %ecx, %mm5
- lea -8(up,n,8), up
- lea -8(rp,n,8), rp
- lea 1(n), %r8d
- neg n
- shl %cl, %rax C function return value
- and $3, %r8d
- je L(rol) C jump for n = 3, 7, 11, ...
- dec %r8d
- jne L(1)
- C n = 4, 8, 12, ...
- movq 8(up,n,8), %mm2
- psrlq %mm4, %mm2
- movq 16(up,n,8), %mm0
- psllq %mm5, %mm0
- por %mm0, %mm2
- movq %mm2, 8(rp,n,8)
- inc n
- jmp L(rol)
- L(1): dec %r8d
- je L(1x) C jump for n = 1, 5, 9, 13, ...
- C n = 2, 6, 10, 16, ...
- movq 8(up,n,8), %mm2
- psrlq %mm4, %mm2
- movq 16(up,n,8), %mm0
- psllq %mm5, %mm0
- por %mm0, %mm2
- movq %mm2, 8(rp,n,8)
- inc n
- L(1x):
- cmp $-1, n
- je L(ast)
- movq 8(up,n,8), %mm2
- psrlq %mm4, %mm2
- movq 16(up,n,8), %mm3
- psrlq %mm4, %mm3
- movq 16(up,n,8), %mm0
- movq 24(up,n,8), %mm1
- psllq %mm5, %mm0
- por %mm0, %mm2
- psllq %mm5, %mm1
- por %mm1, %mm3
- movq %mm2, 8(rp,n,8)
- movq %mm3, 16(rp,n,8)
- add $2, n
- L(rol): movq 8(up,n,8), %mm2
- psrlq %mm4, %mm2
- movq 16(up,n,8), %mm3
- psrlq %mm4, %mm3
- add $4, n C 4
- jb L(end) C 2
- ALIGN(32)
- L(top):
- C finish stuff from lsh block
- movq -16(up,n,8), %mm0
- movq -8(up,n,8), %mm1
- psllq %mm5, %mm0
- por %mm0, %mm2
- psllq %mm5, %mm1
- movq (up,n,8), %mm0
- por %mm1, %mm3
- movq 8(up,n,8), %mm1
- movq %mm2, -24(rp,n,8)
- movq %mm3, -16(rp,n,8)
- C start two new rsh
- psllq %mm5, %mm0
- psllq %mm5, %mm1
- C finish stuff from rsh block
- movq -8(up,n,8), %mm2
- movq (up,n,8), %mm3
- psrlq %mm4, %mm2
- por %mm2, %mm0
- psrlq %mm4, %mm3
- movq 8(up,n,8), %mm2
- por %mm3, %mm1
- movq 16(up,n,8), %mm3
- movq %mm0, -8(rp,n,8)
- movq %mm1, (rp,n,8)
- C start two new lsh
- add $4, n
- psrlq %mm4, %mm2
- psrlq %mm4, %mm3
- jae L(top) C 2
- L(end):
- movq -16(up,n,8), %mm0
- psllq %mm5, %mm0
- por %mm0, %mm2
- movq -8(up,n,8), %mm1
- psllq %mm5, %mm1
- por %mm1, %mm3
- movq %mm2, -24(rp,n,8)
- movq %mm3, -16(rp,n,8)
- L(ast): movq (up), %mm2
- psrlq %mm4, %mm2
- movq %mm2, (rp)
- emms
- ret
- EPILOGUE()