bdiv_dbm1c.asm
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上传日期:2022-08-06
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- dnl x86 mpn_bdiv_dbm1.
- dnl Copyright 2008 Free Software Foundation, Inc.
- dnl This file is part of the GNU MP Library.
- dnl The GNU MP Library is free software; you can redistribute it and/or modify
- dnl it under the terms of the GNU Lesser General Public License as published
- dnl by the Free Software Foundation; either version 3 of the License, or (at
- dnl your option) any later version.
- dnl The GNU MP Library is distributed in the hope that it will be useful, but
- dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- dnl License for more details.
- 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 K7: 3.5
- C P4 m0: ?
- C P4 m1: ?
- C P4 m2: 13.67
- C P4 m3: ?
- C P4 m4: ?
- C P6-13: 5.1
- C TODO
- C * Optimize for more x86 processors
- ASM_START()
- TEXT
- ALIGN(16)
- PROLOGUE(mpn_bdiv_dbm1c)
- mov 16(%esp), %ecx C d
- push %esi
- mov 12(%esp), %esi C ap
- push %edi
- mov 12(%esp), %edi C qp
- push %ebp
- mov 24(%esp), %ebp C n
- push %ebx
- mov (%esi), %eax
- mul %ecx
- mov 36(%esp), %ebx
- sub %eax, %ebx
- mov %ebx, (%edi)
- sbb %edx, %ebx
- mov %ebp, %eax
- and $3, %eax
- jz L(b0)
- cmp $2, %eax
- jc L(b1)
- jz L(b2)
- jmp L(b3)
- L(b0): mov 4(%esi), %eax
- lea -4(%esi), %esi
- lea 12(%edi), %edi
- add $-4, %ebp
- jmp L(0)
- L(b3):
- lea -8(%esi), %esi
- lea 8(%edi), %edi
- add $-3, %ebp
- jmp L(3)
- L(b2): mov 4(%esi), %eax
- lea 4(%esi), %esi
- lea 4(%edi), %edi
- add $-2, %ebp
- jmp L(2)
- ALIGN(8)
- L(top):
- mov 4(%esi), %eax
- mul %ecx
- lea 16(%edi), %edi
- sub %eax, %ebx
- mov 8(%esi), %eax
- mov %ebx, -12(%edi)
- sbb %edx, %ebx
- L(0): mul %ecx
- sub %eax, %ebx
- mov %ebx, -8(%edi)
- sbb %edx, %ebx
- L(3): mov 12(%esi), %eax
- mul %ecx
- sub %eax, %ebx
- mov %ebx, -4(%edi)
- mov 16(%esi), %eax
- lea 16(%esi), %esi
- sbb %edx, %ebx
- L(2): mul %ecx
- sub %eax, %ebx
- mov %ebx, 0(%edi)
- sbb %edx, %ebx
- L(b1): add $-4, %ebp
- jns L(top)
- mov %ebx, %eax
- pop %ebx
- pop %ebp
- pop %edi
- pop %esi
- ret
- EPILOGUE()