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dnl x86 mpn_add_n/mpn_sub_n -- mpn addition and subtraction.
dnl Copyright 1992, 1994-1996, 1999-2002 Free Software Foundation, Inc.
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 modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C P5 3.375
C P6 3.125
C K6 3.5
C K7 2.25
C P4 8.75
ifdef(`OPERATION_add_n',`
define(M4_inst, adcl)
define(M4_function_n, mpn_add_n)
define(M4_function_nc, mpn_add_nc)
',`ifdef(`OPERATION_sub_n',`
define(M4_inst, sbbl)
define(M4_function_n, mpn_sub_n)
define(M4_function_nc, mpn_sub_nc)
',`m4_error(`Need OPERATION_add_n or OPERATION_sub_n
')')')
MULFUNC_PROLOGUE(mpn_add_n mpn_add_nc mpn_sub_n mpn_sub_nc)
C mp_limb_t M4_function_n (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
C mp_size_t size);
C mp_limb_t M4_function_nc (mp_ptr dst, mp_srcptr src1, mp_srcptr src2,
C mp_size_t size, mp_limb_t carry);
defframe(PARAM_CARRY,20)
defframe(PARAM_SIZE, 16)
defframe(PARAM_SRC2, 12)
defframe(PARAM_SRC1, 8)
defframe(PARAM_DST, 4)
TEXT
ALIGN(8)
PROLOGUE(M4_function_nc)
deflit(`FRAME',0)
pushl %edi FRAME_pushl()
pushl %esi FRAME_pushl()
movl PARAM_DST,%edi
movl PARAM_SRC1,%esi
movl PARAM_SRC2,%edx
movl PARAM_SIZE,%ecx
movl %ecx,%eax
shrl $3,%ecx C compute count for unrolled loop
negl %eax
andl $7,%eax C get index where to start loop
jz L(oopgo) C necessary special case for 0
incl %ecx C adjust loop count
shll $2,%eax C adjustment for pointers...
subl %eax,%edi C ... since they are offset ...
subl %eax,%esi C ... by a constant when we ...
subl %eax,%edx C ... enter the loop
shrl $2,%eax C restore previous value
ifdef(`PIC',`
C Calculate start address in loop for PIC. Due to limitations in
C old gas, LF(M4_function_n,oop)-L(0a)-3 cannot be put into the leal
call L(0a)
L(0a): leal (%eax,%eax,8),%eax
addl (%esp),%eax
addl $L(oop)-L(0a)-3,%eax
addl $4,%esp
',`
C Calculate start address in loop for non-PIC.
leal L(oop)-3(%eax,%eax,8),%eax
')
C These lines initialize carry from the 5th parameter. Should be
C possible to simplify.
pushl %ebp FRAME_pushl()
movl PARAM_CARRY,%ebp
shrl %ebp C shift bit 0 into carry
popl %ebp FRAME_popl()
jmp *%eax C jump into loop
EPILOGUE()
ALIGN(16)
PROLOGUE(M4_function_n)
deflit(`FRAME',0)
pushl %edi FRAME_pushl()
pushl %esi FRAME_pushl()
movl PARAM_DST,%edi
movl PARAM_SRC1,%esi
movl PARAM_SRC2,%edx
movl PARAM_SIZE,%ecx
movl %ecx,%eax
shrl $3,%ecx C compute count for unrolled loop
negl %eax
andl $7,%eax C get index where to start loop
jz L(oop) C necessary special case for 0
incl %ecx C adjust loop count
shll $2,%eax C adjustment for pointers...
subl %eax,%edi C ... since they are offset ...
subl %eax,%esi C ... by a constant when we ...
subl %eax,%edx C ... enter the loop
shrl $2,%eax C restore previous value
ifdef(`PIC',`
C Calculate start address in loop for PIC. Due to limitations in
C some assemblers, L(oop)-L(0b)-3 cannot be put into the leal
call L(0b)
L(0b): leal (%eax,%eax,8),%eax
addl (%esp),%eax
addl $L(oop)-L(0b)-3,%eax
addl $4,%esp
',`
C Calculate start address in loop for non-PIC.
leal L(oop)-3(%eax,%eax,8),%eax
')
jmp *%eax C jump into loop
L(oopgo):
pushl %ebp FRAME_pushl()
movl PARAM_CARRY,%ebp
shrl %ebp C shift bit 0 into carry
popl %ebp FRAME_popl()
ALIGN(16)
L(oop): movl (%esi),%eax
M4_inst (%edx),%eax
movl %eax,(%edi)
movl 4(%esi),%eax
M4_inst 4(%edx),%eax
movl %eax,4(%edi)
movl 8(%esi),%eax
M4_inst 8(%edx),%eax
movl %eax,8(%edi)
movl 12(%esi),%eax
M4_inst 12(%edx),%eax
movl %eax,12(%edi)
movl 16(%esi),%eax
M4_inst 16(%edx),%eax
movl %eax,16(%edi)
movl 20(%esi),%eax
M4_inst 20(%edx),%eax
movl %eax,20(%edi)
movl 24(%esi),%eax
M4_inst 24(%edx),%eax
movl %eax,24(%edi)
movl 28(%esi),%eax
M4_inst 28(%edx),%eax
movl %eax,28(%edi)
leal 32(%edi),%edi
leal 32(%esi),%esi
leal 32(%edx),%edx
decl %ecx
jnz L(oop)
sbbl %eax,%eax
negl %eax
popl %esi
popl %edi
ret
EPILOGUE()
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