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dnl Intel P6/64 mpn_rsh1add_n and mpn_rsh1sub_n -- rp[] = (up[] +- vp[]) >> 1
dnl Copyright 2003, 2005, 2009, 2010, 2011 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
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 Lesser General Public
dnl License for more details.
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 cycles/limb
C AMD K8,K9 ?
C AMD K10 4.25
C Intel P4 21.5
C Intel core2 3.2
C Intel NHM 3.87
C Intel SBR 2.05
C Intel atom ?
C VIA nano 44.9
C INPUT PARAMETERS
define(`rp', `%rdi')
define(`up', `%rsi')
define(`vp', `%rdx')
define(`n', `%rcx')
ifdef(`OPERATION_rsh1add_n', `
define(ADDSUB, add)
define(ADCSBB, adc)
define(func_n, mpn_rsh1add_n)
define(func_nc, mpn_rsh1add_nc)')
ifdef(`OPERATION_rsh1sub_n', `
define(ADDSUB, sub)
define(ADCSBB, sbb)
define(func_n, mpn_rsh1sub_n)
define(func_nc, mpn_rsh1sub_nc)')
MULFUNC_PROLOGUE(mpn_rsh1add_n mpn_rsh1add_nc mpn_rsh1sub_n mpn_rsh1sub_nc)
ifdef(`HOST_DOS64',`
define(`IFDOS', `$1')
define(`IFELF', `')
',`
define(`IFDOS', `')
define(`IFELF', `$1')
')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(ELF64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(func_nc)
DOS64_ENTRY(4)
IFDOS(` mov 56(%rsp), %r8 ')
push %rbx
push %rbp
neg %r8 C set C flag from parameter
mov (up), %rbp
ADCSBB (vp), %rbp
jmp L(ent)
EPILOGUE()
ALIGN(16)
PROLOGUE(func_n)
DOS64_ENTRY(4)
push %rbx
push %rbp
mov (up), %rbp
ADDSUB (vp), %rbp
L(ent):
sbb R32(%rbx), R32(%rbx) C save cy
mov R32(%rbp), R32(%rax)
and $1, R32(%rax) C return value
mov R32(n), R32(%r11)
and $3, R32(%r11)
cmp $1, R32(%r11)
je L(do) C jump if n = 1 5 9 ...
L(n1): cmp $2, R32(%r11)
jne L(n2) C jump unless n = 2 6 10 ...
add R32(%rbx), R32(%rbx) C restore cy
mov 8(up), %r10
ADCSBB 8(vp), %r10
lea 8(up), up
lea 8(vp), vp
lea 8(rp), rp
sbb R32(%rbx), R32(%rbx) C save cy
shrd $1, %r10, %rbp
mov %rbp, -8(rp)
jmp L(cj1)
L(n2): cmp $3, R32(%r11)
jne L(n3) C jump unless n = 3 7 11 ...
add R32(%rbx), R32(%rbx) C restore cy
mov 8(up), %r9
mov 16(up), %r10
ADCSBB 8(vp), %r9
ADCSBB 16(vp), %r10
lea 16(up), up
lea 16(vp), vp
lea 16(rp), rp
sbb R32(%rbx), R32(%rbx) C save cy
shrd $1, %r9, %rbp
mov %rbp, -16(rp)
jmp L(cj2)
L(n3): dec n C come here for n = 4 8 12 ...
add R32(%rbx), R32(%rbx) C restore cy
mov 8(up), %r8
mov 16(up), %r9
ADCSBB 8(vp), %r8
ADCSBB 16(vp), %r9
mov 24(up), %r10
ADCSBB 24(vp), %r10
lea 24(up), up
lea 24(vp), vp
lea 24(rp), rp
sbb R32(%rbx), R32(%rbx) C save cy
shrd $1, %r8, %rbp
mov %rbp, -24(rp)
shrd $1, %r9, %r8
mov %r8, -16(rp)
L(cj2): shrd $1, %r10, %r9
mov %r9, -8(rp)
L(cj1): mov %r10, %rbp
L(do):
shr $2, n C 4
je L(end) C 2
ALIGN(16)
L(top): add R32(%rbx), R32(%rbx) C restore cy
mov 8(up), %r8
mov 16(up), %r9
ADCSBB 8(vp), %r8
ADCSBB 16(vp), %r9
mov 24(up), %r10
mov 32(up), %r11
ADCSBB 24(vp), %r10
ADCSBB 32(vp), %r11
lea 32(up), up
lea 32(vp), vp
sbb R32(%rbx), R32(%rbx) C save cy
shrd $1, %r8, %rbp
mov %rbp, (rp)
shrd $1, %r9, %r8
mov %r8, 8(rp)
shrd $1, %r10, %r9
mov %r9, 16(rp)
shrd $1, %r11, %r10
mov %r10, 24(rp)
dec n
mov %r11, %rbp
lea 32(rp), rp
jne L(top)
L(end): shrd $1, %rbx, %rbp
mov %rbp, (rp)
pop %rbp
pop %rbx
DOS64_EXIT()
ret
EPILOGUE()
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