com.asm
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上传日期:2022-08-06
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- dnl Intel Pentium mpn_com -- mpn ones complement.
- dnl Copyright 1996, 2001, 2002, 2006 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: 1.75 cycles/limb
- NAILS_SUPPORT(0-31)
- C void mpn_com (mp_ptr dst, mp_srcptr src, mp_size_t size);
- C
- C This code is similar to mpn_copyi, basically there's just some "xorl
- C $GMP_NUMB_MASK"s inserted.
- C
- C Alternatives:
- C
- C On P55 some MMX code could be 1.25 c/l (8 limb unrolled) if src and dst
- C are the same alignment mod 8, but it doesn't seem worth the trouble for
- C just that case (there'd need to be some plain integer available too for
- C the unaligned case).
- defframe(PARAM_SIZE,12)
- defframe(PARAM_SRC, 8)
- defframe(PARAM_DST, 4)
- TEXT
- ALIGN(8)
- PROLOGUE(mpn_com)
- deflit(`FRAME',0)
- movl PARAM_SRC, %eax
- movl PARAM_SIZE, %ecx
- pushl %esi FRAME_pushl()
- pushl %edi FRAME_pushl()
- leal (%eax,%ecx,4), %eax
- xorl $-1, %ecx C -size-1
- movl PARAM_DST, %edx
- addl $8, %ecx C -size+7
- jns L(end)
- movl (%edx), %esi C fetch destination cache line
- nop
- L(top):
- C eax &src[size]
- C ebx
- C ecx counter, limbs, negative
- C edx dst, incrementing
- C esi scratch
- C edi scratch
- C ebp
- movl 28(%edx), %esi C destination prefetch
- addl $32, %edx
- movl -28(%eax,%ecx,4), %esi
- movl -24(%eax,%ecx,4), %edi
- xorl $GMP_NUMB_MASK, %esi
- xorl $GMP_NUMB_MASK, %edi
- movl %esi, -32(%edx)
- movl %edi, -28(%edx)
- movl -20(%eax,%ecx,4), %esi
- movl -16(%eax,%ecx,4), %edi
- xorl $GMP_NUMB_MASK, %esi
- xorl $GMP_NUMB_MASK, %edi
- movl %esi, -24(%edx)
- movl %edi, -20(%edx)
- movl -12(%eax,%ecx,4), %esi
- movl -8(%eax,%ecx,4), %edi
- xorl $GMP_NUMB_MASK, %esi
- xorl $GMP_NUMB_MASK, %edi
- movl %esi, -16(%edx)
- movl %edi, -12(%edx)
- movl -4(%eax,%ecx,4), %esi
- movl (%eax,%ecx,4), %edi
- xorl $GMP_NUMB_MASK, %esi
- xorl $GMP_NUMB_MASK, %edi
- movl %esi, -8(%edx)
- movl %edi, -4(%edx)
- addl $8, %ecx
- js L(top)
- L(end):
- C eax &src[size]
- C ecx 0 to 7, representing respectively 7 to 0 limbs remaining
- C edx dst, next location to store
- subl $4, %ecx
- nop
- jns L(no4)
- movl -12(%eax,%ecx,4), %esi
- movl -8(%eax,%ecx,4), %edi
- xorl $GMP_NUMB_MASK, %esi
- xorl $GMP_NUMB_MASK, %edi
- movl %esi, (%edx)
- movl %edi, 4(%edx)
- movl -4(%eax,%ecx,4), %esi
- movl (%eax,%ecx,4), %edi
- xorl $GMP_NUMB_MASK, %esi
- xorl $GMP_NUMB_MASK, %edi
- movl %esi, 8(%edx)
- movl %edi, 12(%edx)
- addl $16, %edx
- addl $4, %ecx
- L(no4):
- subl $2, %ecx
- nop
- jns L(no2)
- movl -4(%eax,%ecx,4), %esi
- movl (%eax,%ecx,4), %edi
- xorl $GMP_NUMB_MASK, %esi
- xorl $GMP_NUMB_MASK, %edi
- movl %esi, (%edx)
- movl %edi, 4(%edx)
- addl $8, %edx
- addl $2, %ecx
- L(no2):
- popl %edi
- jnz L(done)
- movl -4(%eax), %ecx
- xorl $GMP_NUMB_MASK, %ecx
- popl %esi
- movl %ecx, (%edx)
- ret
- L(done):
- popl %esi
- ret
- EPILOGUE()