rshift.asm
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:2k
- dnl x86-64 mpn_rshift optimized for "Core 2".
- dnl Copyright 2007, 2009 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: 4.25
- C K10: 4.25
- C P4: 14.7
- C P6 core2: 1.27
- C P6 corei7: 1.5
- C INPUT PARAMETERS
- define(`rp', `%rdi')
- define(`up', `%rsi')
- define(`n', `%rdx')
- define(`cnt', `%cl')
- ASM_START()
- TEXT
- ALIGN(16)
- PROLOGUE(mpn_rshift)
- mov %edx, %eax
- and $3, %eax
- jne L(nb00)
- L(b00): C n = 4, 8, 12, ...
- mov (up), %r10
- mov 8(up), %r11
- xor %eax, %eax
- shrd %cl, %r10, %rax
- mov 16(up), %r8
- lea 8(up), up
- lea -24(rp), rp
- sub $4, n
- jmp L(00)
- L(nb00):C n = 1, 5, 9, ...
- cmp $2, %eax
- jae L(nb01)
- L(b01): mov (up), %r9
- xor %eax, %eax
- shrd %cl, %r9, %rax
- sub $2, n
- jb L(le1)
- mov 8(up), %r10
- mov 16(up), %r11
- lea 16(up), up
- lea -16(rp), rp
- jmp L(01)
- L(le1): shr %cl, %r9
- mov %r9, (rp)
- ret
- L(nb01):C n = 2, 6, 10, ...
- jne L(b11)
- L(b10): mov (up), %r8
- mov 8(up), %r9
- xor %eax, %eax
- shrd %cl, %r8, %rax
- sub $3, n
- jb L(le2)
- mov 16(up), %r10
- lea 24(up), up
- lea -8(rp), rp
- jmp L(10)
- L(le2): shrd %cl, %r9, %r8
- mov %r8, (rp)
- shr %cl, %r9
- mov %r9, 8(rp)
- ret
- ALIGN(16)
- L(b11): C n = 3, 7, 11, ...
- mov (up), %r11
- mov 8(up), %r8
- xor %eax, %eax
- shrd %cl, %r11, %rax
- mov 16(up), %r9
- lea 32(up), up
- sub $4, n
- jb L(end)
- ALIGN(16)
- L(top): shrd %cl, %r8, %r11
- mov -8(up), %r10
- mov %r11, (rp)
- L(10): shrd %cl, %r9, %r8
- mov (up), %r11
- mov %r8, 8(rp)
- L(01): shrd %cl, %r10, %r9
- mov 8(up), %r8
- mov %r9, 16(rp)
- L(00): shrd %cl, %r11, %r10
- mov 16(up), %r9
- mov %r10, 24(rp)
- add $32, up
- lea 32(rp), rp
- sub $4, n
- jnc L(top)
- L(end): shrd %cl, %r8, %r11
- mov %r11, (rp)
- shrd %cl, %r9, %r8
- mov %r8, 8(rp)
- shr %cl, %r9
- mov %r9, 16(rp)
- ret
- EPILOGUE()