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dnl Intel Atom mpn_add_n/mpn_sub_n -- rp[] = up[] +- vp[].
dnl Copyright 2011 Free Software Foundation, Inc.
dnl Contributed to the GNU project by Marco Bodrato.
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
C P6 model 0-8,10-12
C P6 model 9 (Banias)
C P6 model 13 (Dothan)
C P4 model 0 (Willamette)
C P4 model 1 (?)
C P4 model 2 (Northwood)
C P4 model 3 (Prescott)
C P4 model 4 (Nocona)
C Intel Atom 3
C AMD K6
C AMD K7
C AMD K8
C AMD K10
ifdef(`OPERATION_add_n', `
define(M4_inst, adcl)
define(M4_function_n, mpn_add_n)
define(M4_function_nc, mpn_add_nc)
define(M4_description, add)
',`ifdef(`OPERATION_sub_n', `
define(M4_inst, sbbl)
define(M4_function_n, mpn_sub_n)
define(M4_function_nc, mpn_sub_nc)
define(M4_description, subtract)
',`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);
C
C Calculate src1,size M4_description src2,size, and store the result in
C dst,size. The return value is the carry bit from the top of the result (1
C or 0).
C
C The _nc version accepts 1 or 0 for an initial carry into the low limb of
C the calculation. Note values other than 1 or 0 here will lead to garbage
C results.
defframe(PARAM_CARRY,20)
defframe(PARAM_SIZE, 16)
defframe(PARAM_SRC2, 12)
defframe(PARAM_SRC1, 8)
defframe(PARAM_DST, 4)
dnl re-use parameter space
define(SAVE_RP,`PARAM_SIZE')
define(SAVE_VP,`PARAM_SRC1')
define(SAVE_UP,`PARAM_DST')
define(`rp', `%edi')
define(`up', `%esi')
define(`vp', `%ebx')
define(`cy', `%ecx')
define(`r1', `%ecx')
define(`r2', `%edx')
ASM_START()
TEXT
ALIGN(16)
deflit(`FRAME',0)
PROLOGUE(M4_function_n)
xor cy, cy C carry
L(start):
mov PARAM_SIZE, %eax C size
mov rp, SAVE_RP
mov PARAM_DST, rp
mov up, SAVE_UP
mov PARAM_SRC1, up
shr %eax C size >> 1
mov vp, SAVE_VP
mov PARAM_SRC2, vp
jz L(one) C size == 1
jc L(three) C size % 2 == 1
shr cy
mov (up), r2
lea 4(up), up
lea 4(vp), vp
lea -4(rp), rp
jmp L(entry)
L(one):
shr cy
mov (up), r1
jmp L(end)
L(three):
shr cy
mov (up), r1
ALIGN(16)
L(oop):
M4_inst (vp), r1
lea 8(up), up
mov -4(up), r2
lea 8(vp), vp
mov r1, (rp)
L(entry):
M4_inst -4(vp), r2
lea 8(rp), rp
dec %eax
mov (up), r1
mov r2, -4(rp)
jnz L(oop)
L(end): C %eax is zero here
mov SAVE_UP, up
M4_inst (vp), r1
mov SAVE_VP, vp
mov r1, (rp)
adc %eax, %eax
mov SAVE_RP, rp
ret
EPILOGUE()
PROLOGUE(M4_function_nc)
mov PARAM_CARRY, cy C carry
jmp L(start)
EPILOGUE()
ASM_END()
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