dnl AMD64 mpn_copyi optimised
for CPUs with fast SSE.
dnl Copyright 2003, 2005, 2007, 2011, 2012, 2015 Free Software Foundation,
dnl
Inc.
dnl Contributed to the GNU project by Torbjörn Granlund.
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 cycles/limb cycles/limb good
C aligned unaligned best seen
for cpu?
C AMD K8,K9
C AMD K10 0.85 1.64 Y/N
C AMD bull 1.4 1.4 N
C AMD pile 0.77 0.93 N
C AMD steam ? ?
C AMD excavator ? ?
C AMD bobcat
C AMD jaguar 0.65 1.02 opt/0.93 Y/N
C Intel P4 2.3 2.3 Y
C Intel core 1.0 1.0 0.52/0.64 N
C Intel NHM 0.5 0.67 Y
C Intel SBR 0.51 0.75 opt/0.54 Y/N
C Intel IBR 0.50 0.57 opt/0.54 Y
C Intel HWL 0.50 0.57 opt/0.51 Y
C Intel BWL 0.55 0.62 opt/0.55 Y
C Intel atom
C Intel SLM 1.02 1.27 opt/1.07 Y/N
C VIA nano 1.16 5.16 Y/N
C We try to do as many 16-
byte operations as possible. The top-most
and
C bottom-most writes might need 8-
byte operations. We can always write using
C aligned 16-
byte operations, we read with both aligned
and unaligned 16-
byte
C operations.
C Instead of having separate loops
for reading aligned
and unaligned, we read
C using MOVDQU.
This seems to work great except
for core2
; there performance
C doubles when reading using MOVDQA (
for aligned source). It is unclear how to
C best handle the unaligned case there.
C INPUT PARAMETERS
define(`rp
', `%rdi')
define(`up
', `%rsi')
define(`n
', `%rdx')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
dnl define(`movdqu
', lddqu)
ASM_START()
TEXT
ALIGN(64)
PROLOGUE(mpn_copyi)
FUNC_ENTRY(3)
cmp $3, n C NB: bc
code below assumes
this limit
jc L(bc)
test $8, R8(rp) C is rp 16-
byte aligned?
jz L(ali) C jump
if rp aligned
movsq C copy single limb
dec n
L(ali):
sub $16, n
jc L(sma)
IFDOS(`
add $-56, %rsp
')
IFDOS(` movdqa %xmm6, (%rsp)
')
IFDOS(` movdqa %xmm7, 16(%rsp)
')
ALIGN(16)
L(top): movdqu (up), %xmm0
movdqu 16(up), %xmm1
movdqu 32(up), %xmm2
movdqu 48(up), %xmm3
movdqu 64(up), %xmm4
movdqu 80(up), %xmm5
movdqu 96(up), %xmm6
movdqu 112(up), %xmm7
lea 128(up), up
movdqa %xmm0, (rp)
movdqa %xmm1, 16(rp)
movdqa %xmm2, 32(rp)
movdqa %xmm3, 48(rp)
movdqa %xmm4, 64(rp)
movdqa %xmm5, 80(rp)
movdqa %xmm6, 96(rp)
movdqa %xmm7, 112(rp)
lea 128(rp), rp
sub $16, n
jnc L(top)
IFDOS(` movdqa (%rsp), %xmm6
')
IFDOS(` movdqa 16(%rsp), %xmm7
')
IFDOS(`
add $56, %rsp
')
L(sma): test $8, R8(n)
jz 1f
movdqu (up), %xmm0
movdqu 16(up), %xmm1
movdqu 32(up), %xmm2
movdqu 48(up), %xmm3
lea 64(up), up
movdqa %xmm0, (rp)
movdqa %xmm1, 16(rp)
movdqa %xmm2, 32(rp)
movdqa %xmm3, 48(rp)
lea 64(rp), rp
1:
test $4, R8(n)
jz 1f
movdqu (up), %xmm0
movdqu 16(up), %xmm1
lea 32(up), up
movdqa %xmm0, (rp)
movdqa %xmm1, 16(rp)
lea 32(rp), rp
1:
test $2, R8(n)
jz 1f
movdqu (up), %xmm0
lea 16(up), up
movdqa %xmm0, (rp)
lea 16(rp), rp
ALIGN(16)
1:
L(
end): test $1, R8(n)
jz 1f
mov (up), %r8
mov %r8, (rp)
1:
FUNC_EXIT()
ret
C Basecase
code. Needed
for good small operands speed, not
for correctness as
C the above
code is currently written. The commented-out lines need to be
C reinstated
if this code is to be used
for n > 3,
and then the post loop
C offsets need fixing.
L(bc):
sub $2, n
jc L(
end)
ALIGN(16)
1:
mov (up), %rax
mov 8(up), %rcx
dnl
lea 16(up), up
mov %rax, (rp)
mov %rcx, 8(rp)
dnl
lea 16(rp), rp
dnl
sub $2, n
dnl jnc 1b
test $1, R8(n)
jz L(
ret)
mov 16(up), %rax
mov %rax, 16(rp)
L(
ret): FUNC_EXIT()
ret
EPILOGUE()
