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dnl AMD64 mpn_sublshC_n -- rp[] = up[] - (vp[] << 1), optimised for Core 2 and
dnl Core iN.
dnl Contributed to the GNU project by Torbjorn Granlund.
dnl Copyright 2008, 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/.
C cycles/limb
C AMD K8,K9 4.25
C AMD K10 ?
C Intel P4 ?
C Intel core2 3
C Intel NHM 3.1
C Intel SBR 2.47
C Intel atom ?
C VIA nano ?
C INPUT PARAMETERS
define(`rp',`%rdi')
define(`up',`%rsi')
define(`vp',`%rdx')
define(`n', `%rcx')
ASM_START()
TEXT
ALIGN(8)
PROLOGUE(func)
DOS64_ENTRY(4)
push %rbx
push %r12
mov R32(%rcx), R32(%rax)
lea 24(up,n,8), up
lea 24(vp,n,8), vp
lea 24(rp,n,8), rp
neg n
xor R32(%r11), R32(%r11)
mov -24(vp,n,8), %r8 C do first limb early
shrd $RSH, %r8, %r11
and $3, R32(%rax)
je L(b0)
cmp $2, R32(%rax)
jc L(b1)
je L(b2)
L(b3): mov -16(vp,n,8), %r9
shrd $RSH, %r9, %r8
mov -8(vp,n,8), %r10
shrd $RSH, %r10, %r9
mov -24(up,n,8), %r12
ADDSUB %r11, %r12
mov %r12, -24(rp,n,8)
mov -16(up,n,8), %r12
ADCSBB %r8, %r12
mov %r12, -16(rp,n,8)
mov -8(up,n,8), %r12
ADCSBB %r9, %r12
mov %r12, -8(rp,n,8)
mov %r10, %r11
sbb R32(%rax), R32(%rax) C save cy
add $3, n
js L(top)
jmp L(end)
L(b1): mov -24(up,n,8), %r12
ADDSUB %r11, %r12
mov %r12, -24(rp,n,8)
mov %r8, %r11
sbb R32(%rax), R32(%rax) C save cy
inc n
js L(top)
jmp L(end)
L(b2): mov -16(vp,n,8), %r9
shrd $RSH, %r9, %r8
mov -24(up,n,8), %r12
ADDSUB %r11, %r12
mov %r12, -24(rp,n,8)
mov -16(up,n,8), %r12
ADCSBB %r8, %r12
mov %r12, -16(rp,n,8)
mov %r9, %r11
sbb R32(%rax), R32(%rax) C save cy
add $2, n
js L(top)
jmp L(end)
ALIGN(16)
L(top): mov -24(vp,n,8), %r8
shrd $RSH, %r8, %r11
L(b0): mov -16(vp,n,8), %r9
shrd $RSH, %r9, %r8
mov -8(vp,n,8), %r10
shrd $RSH, %r10, %r9
mov (vp,n,8), %rbx
shrd $RSH, %rbx, %r10
add R32(%rax), R32(%rax) C restore cy
mov -24(up,n,8), %r12
ADCSBB %r11, %r12
mov %r12, -24(rp,n,8)
mov -16(up,n,8), %r12
ADCSBB %r8, %r12
mov %r12, -16(rp,n,8)
mov -8(up,n,8), %r12
ADCSBB %r9, %r12
mov %r12, -8(rp,n,8)
mov (up,n,8), %r12
ADCSBB %r10, %r12
mov %r12, (rp,n,8)
mov %rbx, %r11
sbb R32(%rax), R32(%rax) C save cy
add $4, n
js L(top)
L(end): shr $RSH, %r11
pop %r12
pop %rbx
sub R32(%r11), R32(%rax)
neg R32(%rax)
DOS64_EXIT()
ret
EPILOGUE()
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