dnl AMD64 mpn_copyi optimised
for CPUs with fast SSE copying
and SSSE3.
dnl Copyright 2012, 2013, 2015 Free Software Foundation,
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 2.0 illop 1.0/1.0 N
C AMD K10 0.85 illop Y/N
C AMD bd1 0.70 0.66 Y
C AMD bd2 0.68 0.66 Y
C AMD bd3 ? ?
C AMD bd4 ? ?
C AMD bt1 1.97 8.16 1.5/1.5 N
C AMD bt2 0.77 0.93 0.65/opt N/Y
C AMD zn1 ? ?
C AMD zn2 ? ?
C Intel P4 2.26 illop Y/N
C Intel CNR 0.52 0.64 opt/opt Y
C Intel NHM 0.52 0.71 0.50/0.67 N
C Intel SBR 0.51 0.54 opt/0.51 Y
C Intel IBR 0.50 0.54 opt/opt Y
C Intel HWL 0.50 0.51 opt/opt Y
C Intel BWL 0.55 0.55 opt/opt Y
C Intel atom 1.16 1.61 opt/opt Y
C Intel SLM 1.02 1.07 opt/opt Y
C VIA nano 1.09 1.08 opt/opt Y
C We use only 16-
byte operations, except
for unaligned top-most
and bottom-most
C limbs. We use the SSSE3 palignr instruction when rp - up = 8 (
mod 16). That
C instruction is better adapted to mpn_copyd
's needs, we need to contort the
C
code to use it here.
C
C
For operands of < COPYI_SSE_THRESHOLD limbs, we use a plain 64-bit loop,
C taken from the x86_64 default
code.
C INPUT PARAMETERS
define(`rp
', `%rdi')
define(`up
', `%rsi')
define(`n
', `%rdx')
C There are three instructions
for loading an aligned 128-bit quantity. We use
C movaps, since it has the shortest coding.
dnl define(`movdqa
', ``movaps'')
ifdef(`COPYI_SSE_THRESHOLD
',`',`define(`COPYI_SSE_THRESHOLD
', 7)')
ASM_START()
TEXT
ALIGN(64)
PROLOGUE(mpn_copyi)
FUNC_ENTRY(3)
cmp $COPYI_SSE_THRESHOLD, n
jbe L(bc)
test $8, R8(rp) C is rp 16-
byte aligned?
jz L(rp_aligned) C jump
if rp aligned
movsq C copy one limb
dec n
L(rp_aligned):
test $8, R8(up)
jnz L(uent)
ifelse(eval(COPYI_SSE_THRESHOLD >= 8),1,
`
sub $8, n
',
`
jmp L(am)
')
ALIGN(16)
L(atop):movdqa 0(up), %xmm0
movdqa 16(up), %xmm1
movdqa 32(up), %xmm2
movdqa 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
L(am):
sub $8, n
jnc L(atop)
test $4, R8(n)
jz 1f
movdqa (up), %xmm0
movdqa 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
movdqa (up), %xmm0
lea 16(up), up
movdqa %xmm0, (rp)
lea 16(rp), rp
1: test $1, R8(n)
jz 1f
mov (up), %r8
mov %r8, (rp)
1: FUNC_EXIT()
ret
L(uent):
C
Code handling up - rp = 8 (
mod 16)
cmp $16, n
jc L(ued0)
IFDOS(`
add $-56, %rsp
')
IFDOS(` movdqa %xmm6, (%rsp)
')
IFDOS(` movdqa %xmm7, 16(%rsp)
')
IFDOS(` movdqa %xmm8, 32(%rsp)
')
movaps 120(up), %xmm7
movaps 104(up), %xmm6
movaps 88(up), %xmm5
movaps 72(up), %xmm4
movaps 56(up), %xmm3
movaps 40(up), %xmm2
lea 128(up), up
sub $32, n
jc L(ued1)
ALIGN(16)
L(utop):movaps -104(up), %xmm1
sub $16, n
movaps -120(up), %xmm0
palignr($8, %xmm6, %xmm7)
movaps -136(up), %xmm8
movdqa %xmm7, 112(rp)
palignr($8, %xmm5, %xmm6)
movaps 120(up), %xmm7
movdqa %xmm6, 96(rp)
palignr($8, %xmm4, %xmm5)
movaps 104(up), %xmm6
movdqa %xmm5, 80(rp)
palignr($8, %xmm3, %xmm4)
movaps 88(up), %xmm5
movdqa %xmm4, 64(rp)
palignr($8, %xmm2, %xmm3)
movaps 72(up), %xmm4
movdqa %xmm3, 48(rp)
palignr($8, %xmm1, %xmm2)
movaps 56(up), %xmm3
movdqa %xmm2, 32(rp)
palignr($8, %xmm0, %xmm1)
movaps 40(up), %xmm2
movdqa %xmm1, 16(rp)
palignr($8, %xmm8, %xmm0)
lea 128(up), up
movdqa %xmm0, (rp)
lea 128(rp), rp
jnc L(utop)
L(ued1):movaps -104(up), %xmm1
movaps -120(up), %xmm0
movaps -136(up), %xmm8
palignr($8, %xmm6, %xmm7)
movdqa %xmm7, 112(rp)
palignr($8, %xmm5, %xmm6)
movdqa %xmm6, 96(rp)
palignr($8, %xmm4, %xmm5)
movdqa %xmm5, 80(rp)
palignr($8, %xmm3, %xmm4)
movdqa %xmm4, 64(rp)
palignr($8, %xmm2, %xmm3)
movdqa %xmm3, 48(rp)
palignr($8, %xmm1, %xmm2)
movdqa %xmm2, 32(rp)
palignr($8, %xmm0, %xmm1)
movdqa %xmm1, 16(rp)
palignr($8, %xmm8, %xmm0)
movdqa %xmm0, (rp)
lea 128(rp), rp
IFDOS(` movdqa (%rsp), %xmm6
')
IFDOS(` movdqa 16(%rsp), %xmm7
')
IFDOS(` movdqa 32(%rsp), %xmm8
')
IFDOS(`
add $56, %rsp
')
L(ued0):test $8, R8(n)
jz 1f
movaps 56(up), %xmm3
movaps 40(up), %xmm2
movaps 24(up), %xmm1
movaps 8(up), %xmm0
movaps -8(up), %xmm4
palignr($8, %xmm2, %xmm3)
movdqa %xmm3, 48(rp)
palignr($8, %xmm1, %xmm2)
movdqa %xmm2, 32(rp)
palignr($8, %xmm0, %xmm1)
movdqa %xmm1, 16(rp)
palignr($8, %xmm4, %xmm0)
lea 64(up), up
movdqa %xmm0, (rp)
lea 64(rp), rp
1: test $4, R8(n)
jz 1f
movaps 24(up), %xmm1
movaps 8(up), %xmm0
palignr($8, %xmm0, %xmm1)
movaps -8(up), %xmm3
movdqa %xmm1, 16(rp)
palignr($8, %xmm3, %xmm0)
lea 32(up), up
movdqa %xmm0, (rp)
lea 32(rp), rp
1: test $2, R8(n)
jz 1f
movdqa 8(up), %xmm0
movdqa -8(up), %xmm3
palignr($8, %xmm3, %xmm0)
lea 16(up), up
movdqa %xmm0, (rp)
lea 16(rp), rp
1: 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
C correctness as the above
code is currently written.
L(bc):
lea -8(rp), rp
sub $4, R32(n)
jc L(
end)
ALIGN(16)
L(top):
mov (up), %r8
mov 8(up), %r9
lea 32(rp), rp
mov 16(up), %r10
mov 24(up), %r11
lea 32(up), up
mov %r8, -24(rp)
mov %r9, -16(rp)
ifelse(eval(COPYI_SSE_THRESHOLD >= 8),1,
`
sub $4, R32(n)
')
mov %r10, -8(rp)
mov %r11, (rp)
ifelse(eval(COPYI_SSE_THRESHOLD >= 8),1,
` jnc L(top)
')
L(
end): test $1, R8(n)
jz 1f
mov (up), %r8
mov %r8, 8(rp)
lea 8(rp), rp
lea 8(up), up
1: test $2, R8(n)
jz 1f
mov (up), %r8
mov 8(up), %r9
mov %r8, 8(rp)
mov %r9, 16(rp)
1: FUNC_EXIT()
ret
EPILOGUE()
