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dnl x86 mpn_mod_1 -- mpn by limb remainder.
dnl Copyright (C) 1999, 2000 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 2.1 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
dnl License along with the GNU MP Library; see the file COPYING.LIB. If
dnl not, write to the Free Software Foundation, Inc., 59 Temple Place -
dnl Suite 330, Boston, MA 02111-1307, USA.
dnl cycles/limb
dnl K6 20
dnl P5 44
dnl P6 39
dnl 486 approx 42 maybe
dnl
dnl The following have their own optimized mod_1 implementations, but for
dnl reference the code here runs as follows.
dnl
dnl P6MMX 39
dnl K7 41
include(`../config.m4')
C mp_limb_t mpn_mod_1 (mp_srcptr src, mp_size_t size, mp_limb_t divisor);
C mp_limb_t mpn_mod_1c (mp_srcptr src, mp_size_t size, mp_limb_t divisor,
C mp_limb_t carry);
C
C Divide src,size by divisor and return the remainder. The quotient is
C discarded.
C
C See mpn/x86/divrem_1.asm for some comments.
defframe(PARAM_CARRY, 16)
defframe(PARAM_DIVISOR,12)
defframe(PARAM_SIZE, 8)
defframe(PARAM_SRC, 4)
.text
ALIGN(16)
PROLOGUE(mpn_mod_1c)
deflit(`FRAME',0)
movl PARAM_SIZE, %ecx
pushl %ebx FRAME_pushl()
movl PARAM_SRC, %ebx
pushl %esi FRAME_pushl()
movl PARAM_DIVISOR, %esi
orl %ecx, %ecx
movl PARAM_CARRY, %edx
jnz LF(mpn_mod_1,top)
popl %esi
movl %edx, %eax
popl %ebx
ret
EPILOGUE()
PROLOGUE(mpn_mod_1)
deflit(`FRAME',0)
movl PARAM_SIZE, %ecx
pushl %ebx FRAME_pushl()
movl PARAM_SRC, %ebx
pushl %esi FRAME_pushl()
orl %ecx, %ecx
jz L(done_zero)
movl PARAM_DIVISOR, %esi
movl -4(%ebx,%ecx,4), %eax C src high limb
cmpl %esi, %eax
sbbl %edx, %edx C -1 if high<divisor
addl %edx, %ecx C skip one division if high<divisor
jz L(done_eax)
andl %eax, %edx C carry if high<divisor
L(top):
C eax scratch (quotient)
C ebx src
C ecx counter
C edx carry (remainder)
C esi divisor
C edi
C ebp
movl -4(%ebx,%ecx,4), %eax
divl %esi
loop_or_decljnz L(top)
movl %edx, %eax
L(done_eax):
popl %esi
popl %ebx
ret
L(done_zero):
popl %esi
xorl %eax, %eax
popl %ebx
ret
EPILOGUE()
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