136 lines
2.8 KiB
NASM
136 lines
2.8 KiB
NASM
dnl AMD K7 mpn_copyd -- copy limb vector, decrementing.
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dnl Copyright 1999, 2000, 2002 Free Software Foundation, Inc.
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dnl
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dnl This file is part of the GNU MP Library.
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dnl
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dnl The GNU MP Library is free software; you can redistribute it and/or
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dnl modify it under the terms of the GNU Lesser General Public License as
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dnl published by the Free Software Foundation; either version 2.1 of the
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dnl License, or (at your option) any later version.
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dnl
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dnl The GNU MP Library is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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dnl Lesser General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU Lesser General Public
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dnl License along with the GNU MP Library; see the file COPYING.LIB. If
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dnl not, write to the Free Software Foundation, Inc., 51 Franklin Street,
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dnl Fifth Floor, Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C alignment dst/src, A=0mod8 N=4mod8
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C A/A A/N N/A N/N
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C K7 0.75 1.0 1.0 0.75
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C void mpn_copyd (mp_ptr dst, mp_srcptr src, mp_size_t size);
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C
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C The various comments in mpn/x86/k7/copyi.asm apply here too.
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defframe(PARAM_SIZE,12)
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defframe(PARAM_SRC, 8)
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defframe(PARAM_DST, 4)
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deflit(`FRAME',0)
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dnl parameter space reused
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define(SAVE_EBX,`PARAM_SIZE')
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define(SAVE_ESI,`PARAM_SRC')
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dnl minimum 5 since the unrolled code can't handle less than 5
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deflit(UNROLL_THRESHOLD, 5)
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TEXT
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ALIGN(32)
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PROLOGUE(mpn_copyd)
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movl PARAM_SIZE, %ecx
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movl %ebx, SAVE_EBX
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movl PARAM_SRC, %eax
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movl PARAM_DST, %edx
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cmpl $UNROLL_THRESHOLD, %ecx
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jae L(unroll)
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orl %ecx, %ecx
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jz L(simple_done)
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L(simple):
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C eax src
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C ebx scratch
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C ecx counter
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C edx dst
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C
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C this loop is 2 cycles/limb
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movl -4(%eax,%ecx,4), %ebx
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movl %ebx, -4(%edx,%ecx,4)
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decl %ecx
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jnz L(simple)
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L(simple_done):
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movl SAVE_EBX, %ebx
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ret
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L(unroll):
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movl %esi, SAVE_ESI
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leal (%eax,%ecx,4), %ebx
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leal (%edx,%ecx,4), %esi
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andl %esi, %ebx
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movl SAVE_ESI, %esi
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subl $4, %ecx C size-4
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testl $4, %ebx C testl to pad code closer to 16 bytes for L(top)
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jz L(aligned)
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C both src and dst unaligned, process one limb to align them
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movl 12(%eax,%ecx,4), %ebx
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movl %ebx, 12(%edx,%ecx,4)
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decl %ecx
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L(aligned):
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ALIGN(16)
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L(top):
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C eax src
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C ebx
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C ecx counter, limbs
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C edx dst
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movq 8(%eax,%ecx,4), %mm0
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movq (%eax,%ecx,4), %mm1
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subl $4, %ecx
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movq %mm0, 16+8(%edx,%ecx,4)
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movq %mm1, 16(%edx,%ecx,4)
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jns L(top)
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C now %ecx is -4 to -1 representing respectively 0 to 3 limbs remaining
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testb $2, %cl
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jz L(finish_not_two)
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movq 8(%eax,%ecx,4), %mm0
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movq %mm0, 8(%edx,%ecx,4)
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L(finish_not_two):
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testb $1, %cl
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jz L(done)
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movl (%eax), %ebx
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movl %ebx, (%edx)
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L(done):
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movl SAVE_EBX, %ebx
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emms
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ret
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EPILOGUE()
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