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dnl AMD64 mpn_sublsh1_n -- rp[] = up[] - (vp[] << 1)
dnl Copyright 2003, 2005-2007, 2011, 2012 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 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(STD64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_sublsh1_n)
FUNC_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
FUNC_EXIT()
ret
EPILOGUE()
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