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dnl AMD64 mpn_sublsh1_n -- rp[] = up[] - (vp[] << 1)
dnl Copyright 2003, 2005, 2006, 2007, 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 2.2
C AMD K10 2.2
C Intel P4 12.75
C Intel core2 3.45
C Intel corei ?
C Intel atom ?
C VIA nano 3.25
C Sometimes speed degenerates, supposedly related to that some operand
C alignments cause cache conflicts.
C The speed is limited by decoding/issue bandwidth. There are 26 instructions
C in the loop, which corresponds to 26/3/4 = 2.167 c/l.
C INPUT PARAMETERS
define(`rp',`%rdi')
define(`up',`%rsi')
define(`vp',`%rdx')
define(`n', `%rcx')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(ELF64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_sublsh1_n)
DOS64_ENTRY(4)
push %rbx
push %rbp
mov (vp), %r8
mov R32(n), R32(%rax)
lea (rp,n,8), rp
lea (up,n,8), up
lea (vp,n,8), vp
neg n
xor R32(%rbp), R32(%rbp)
and $3, R32(%rax)
je L(b00)
cmp $2, R32(%rax)
jc L(b01)
je L(b10)
L(b11): add %r8, %r8
mov 8(vp,n,8), %r9
adc %r9, %r9
mov 16(vp,n,8), %r10
adc %r10, %r10
sbb R32(%rax), R32(%rax) C save scy
mov (up,n,8), %rbp
mov 8(up,n,8), %rbx
sub %r8, %rbp
sbb %r9, %rbx
mov %rbp, (rp,n,8)
mov %rbx, 8(rp,n,8)
mov 16(up,n,8), %rbp
sbb %r10, %rbp
mov %rbp, 16(rp,n,8)
sbb R32(%rbp), R32(%rbp) C save acy
add $3, n
jmp L(ent)
L(b10): add %r8, %r8
mov 8(vp,n,8), %r9
adc %r9, %r9
sbb R32(%rax), R32(%rax) C save scy
mov (up,n,8), %rbp
mov 8(up,n,8), %rbx
sub %r8, %rbp
sbb %r9, %rbx
mov %rbp, (rp,n,8)
mov %rbx, 8(rp,n,8)
sbb R32(%rbp), R32(%rbp) C save acy
add $2, n
jmp L(ent)
L(b01): add %r8, %r8
sbb R32(%rax), R32(%rax) C save scy
mov (up,n,8), %rbp
sub %r8, %rbp
mov %rbp, (rp,n,8)
sbb R32(%rbp), R32(%rbp) C save acy
inc n
L(ent): jns L(end)
ALIGN(16)
L(top): add R32(%rax), R32(%rax) C restore scy
mov (vp,n,8), %r8
L(b00): adc %r8, %r8
mov 8(vp,n,8), %r9
adc %r9, %r9
mov 16(vp,n,8), %r10
adc %r10, %r10
mov 24(vp,n,8), %r11
adc %r11, %r11
sbb R32(%rax), R32(%rax) C save scy
add R32(%rbp), R32(%rbp) C restore acy
mov (up,n,8), %rbp
mov 8(up,n,8), %rbx
sbb %r8, %rbp
sbb %r9, %rbx
mov %rbp, (rp,n,8)
mov %rbx, 8(rp,n,8)
mov 16(up,n,8), %rbp
mov 24(up,n,8), %rbx
sbb %r10, %rbp
sbb %r11, %rbx
mov %rbp, 16(rp,n,8)
mov %rbx, 24(rp,n,8)
sbb R32(%rbp), R32(%rbp) C save acy
add $4, n
js L(top)
L(end): add R32(%rbp), R32(%rax)
neg R32(%rax)
pop %rbp
pop %rbx
DOS64_EXIT()
ret
EPILOGUE()
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