mod_34lsub1.asm
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上传日期:2022-08-06
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- dnl Intel P5 mpn_mod_34lsub1 -- mpn remainder modulo 2**24-1.
- dnl Copyright 2000, 2001, 2002 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 P5: 1.66 cycles/limb
- C mp_limb_t mpn_mod_34lsub1 (mp_srcptr src, mp_size_t size)
- C
- defframe(PARAM_SIZE, 8)
- defframe(PARAM_SRC, 4)
- TEXT
- ALIGN(16)
- PROLOGUE(mpn_mod_34lsub1)
- deflit(`FRAME',0)
- movl PARAM_SIZE, %ecx
- movl PARAM_SRC, %edx
- subl $2, %ecx
- ja L(three_or_more)
- movl (%edx), %eax
- jne L(one)
- movl 4(%edx), %ecx
- movl %eax, %edx
- shrl $24, %edx
- andl $0xFFFFFF, %eax
- addl %edx, %eax
- movl %ecx, %edx
- shrl $16, %ecx
- andl $0xFFFF, %edx
- shll $8, %edx
- addl %ecx, %eax
- addl %edx, %eax
- L(one):
- ret
- L(three_or_more):
- C eax
- C ebx
- C ecx size-2
- C edx src
- C esi
- C edi
- C ebp
- pushl %ebx FRAME_pushl()
- pushl %esi FRAME_pushl()
- pushl %edi FRAME_pushl()
- pushl %ebp FRAME_pushl()
- xorl %esi, %esi C 0mod3
- xorl %edi, %edi C 1mod3
- xorl %ebp, %ebp C 2mod3, and clear carry
- L(top):
- C eax scratch
- C ebx scratch
- C ecx counter, limbs
- C edx src
- C esi 0mod3
- C edi 1mod3
- C ebp 2mod3
- movl (%edx), %eax
- movl 4(%edx), %ebx
- adcl %eax, %esi
- movl 8(%edx), %eax
- adcl %ebx, %edi
- leal 12(%edx), %edx
- adcl %eax, %ebp
- leal -2(%ecx), %ecx
- decl %ecx
- jg L(top)
- C ecx is -2, -1 or 0, representing 0, 1 or 2 more limbs, respectively
- movl $0xFFFFFFFF, %ebx C mask
- incl %ecx
- js L(combine) C 0 more
- movl (%edx), %eax
- movl $0xFFFFFF00, %ebx
- adcl %eax, %esi
- decl %ecx
- js L(combine) C 1 more
- movl 4(%edx), %eax
- movl $0xFFFF0000, %ebx
- adcl %eax, %edi
- L(combine):
- C eax
- C ebx mask
- C ecx
- C edx
- C esi 0mod3
- C edi 1mod3
- C ebp 2mod3
- sbbl %ecx, %ecx C carry
- movl %esi, %eax C 0mod3
- andl %ebx, %ecx C masked for position
- andl $0xFFFFFF, %eax C 0mod3 low
- shrl $24, %esi C 0mod3 high
- subl %ecx, %eax C apply carry
- addl %esi, %eax C apply 0mod3
- movl %edi, %ebx C 1mod3
- shrl $16, %edi C 1mod3 high
- andl $0x0000FFFF, %ebx
- shll $8, %ebx C 1mod3 low
- addl %edi, %eax C apply 1mod3 high
- addl %ebx, %eax C apply 1mod3 low
- movl %ebp, %ebx C 2mod3
- shrl $8, %ebp C 2mod3 high
- andl $0xFF, %ebx
- shll $16, %ebx C 2mod3 low
- addl %ebp, %eax C apply 2mod3 high
- addl %ebx, %eax C apply 2mod3 low
- popl %ebp
- popl %edi
- popl %esi
- popl %ebx
- ret
- EPILOGUE()