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dnl Intel Pentium mpn_mul_basecase -- mpn by mpn multiplication.
dnl Copyright 1996, 1998, 1999, 2000, 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: 14.2 cycles/crossproduct (approx)
C void mpn_mul_basecase (mp_ptr wp,
C mp_srcptr xp, mp_size_t xsize,
C mp_srcptr yp, mp_size_t ysize);
defframe(PARAM_YSIZE, 20)
defframe(PARAM_YP, 16)
defframe(PARAM_XSIZE, 12)
defframe(PARAM_XP, 8)
defframe(PARAM_WP, 4)
defframe(VAR_COUNTER, -4)
TEXT
ALIGN(8)
PROLOGUE(mpn_mul_basecase)
pushl %eax C dummy push for allocating stack slot
pushl %esi
pushl %ebp
pushl %edi
deflit(`FRAME',16)
movl PARAM_XP,%esi
movl PARAM_WP,%edi
movl PARAM_YP,%ebp
movl (%esi),%eax C load xp[0]
mull (%ebp) C multiply by yp[0]
movl %eax,(%edi) C store to wp[0]
movl PARAM_XSIZE,%ecx C xsize
decl %ecx C If xsize = 1, ysize = 1 too
jz L(done)
movl PARAM_XSIZE,%eax
pushl %ebx
FRAME_pushl()
movl %edx,%ebx
leal (%esi,%eax,4),%esi C make xp point at end
leal (%edi,%eax,4),%edi C offset wp by xsize
negl %ecx C negate j size/index for inner loop
xorl %eax,%eax C clear carry
ALIGN(8)
L(oop1): adcl $0,%ebx
movl (%esi,%ecx,4),%eax C load next limb at xp[j]
mull (%ebp)
addl %ebx,%eax
movl %eax,(%edi,%ecx,4)
incl %ecx
movl %edx,%ebx
jnz L(oop1)
adcl $0,%ebx
movl PARAM_YSIZE,%eax
movl %ebx,(%edi) C most significant limb of product
addl $4,%edi C increment wp
decl %eax
jz L(skip)
movl %eax,VAR_COUNTER C set index i to ysize
L(outer):
addl $4,%ebp C make ebp point to next y limb
movl PARAM_XSIZE,%ecx
negl %ecx
xorl %ebx,%ebx
C code at 0x61 here, close enough to aligned
L(oop2):
adcl $0,%ebx
movl (%esi,%ecx,4),%eax
mull (%ebp)
addl %ebx,%eax
movl (%edi,%ecx,4),%ebx
adcl $0,%edx
addl %eax,%ebx
movl %ebx,(%edi,%ecx,4)
incl %ecx
movl %edx,%ebx
jnz L(oop2)
adcl $0,%ebx
movl %ebx,(%edi)
addl $4,%edi
movl VAR_COUNTER,%eax
decl %eax
movl %eax,VAR_COUNTER
jnz L(outer)
L(skip):
popl %ebx
popl %edi
popl %ebp
popl %esi
addl $4,%esp
ret
L(done):
movl %edx,4(%edi) C store to wp[1]
popl %edi
popl %ebp
popl %esi
popl %eax C dummy pop for deallocating stack slot
ret
EPILOGUE()
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