dnl AMD64 mpn_com 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 Torbjorn 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 1.39 ? 1.45 Y/N
C AMD bd2 0.8-1.4 0.7-1.4 Y
C AMD bd3
C AMD bd4
C AMD bobcat 1.97 ? 8.17 1.5/1.5 N
C AMD jaguar 1.02 1.02 0.91/0.91 N
C Intel P4 2.26 illop Y/N
C Intel core 0.58 0.87 opt/0.74 Y
C Intel NHM 0.64 1.14 opt/bad Y
C Intel SBR 0.51 0.65 opt/opt Y
C Intel IBR 0.50 0.64 opt/0.57 Y
C Intel HWL 0.51 0.58 opt/opt Y
C Intel BWL 0.52 0.64 opt/opt Y
C Intel SKL 0.51 0.63 opt/opt Y
C Intel atom 1.16 1.70 opt/opt Y
C Intel SLM 1.02 1.52 N
C VIA nano 1.09 1.10 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 < COM_SSE_THRESHOLD limbs, we use a plain 64-bit loop, taken
C 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.
define(`movdqa
', ``movaps'')
ifdef(`COM_SSE_THRESHOLD
',`',`define(`COM_SSE_THRESHOLD
', 7)')
ASM_START()
TEXT
ALIGN(64)
PROLOGUE(mpn_com)
FUNC_ENTRY(3)
cmp $COM_SSE_THRESHOLD, n
jbe L(bc)
pcmpeqb %xmm5, %xmm5 C set to 111...111
test $8, R8(rp) C is rp 16-
byte aligned?
jz L(rp_aligned) C jump
if rp aligned
mov (up), %r8
lea 8(up), up
not %r8
mov %r8, (rp)
lea 8(rp), rp
dec n
L(rp_aligned):
test $8, R8(up)
jnz L(uent)
ifelse(eval(COM_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
pxor %xmm5, %xmm0
pxor %xmm5, %xmm1
pxor %xmm5, %xmm2
pxor %xmm5, %xmm3
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
pxor %xmm5, %xmm0
pxor %xmm5, %xmm1
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
pxor %xmm5, %xmm0
movdqa %xmm0, (rp)
lea 16(rp), rp
1: test $1, R8(n)
jz 1f
mov (up), %r8
not %r8
mov %r8, (rp)
1: FUNC_EXIT()
ret
L(uent):
C
Code handling up - rp = 8 (
mod 16)
C FIXME: The
code below only handles overlap
if it is close to complete,
or
C quite separate: up-rp < 5
or up-up > 15 limbs
lea -40(up), %rax C 40 = 5 * GMP_LIMB_BYTES
sub rp, %rax
cmp $80, %rax C 80 = (15-5) * GMP_LIMB_BYTES
jbe L(bc) C deflect to plain loop
sub $16, n
jc L(uend)
movdqa 120(up), %xmm3
sub $16, n
jmp L(um)
ALIGN(16)
L(utop):movdqa 120(up), %xmm3
pxor %xmm5, %xmm0
movdqa %xmm0, -128(rp)
sub $16, n
L(um): movdqa 104(up), %xmm2
palignr($8, %xmm2, %xmm3)
movdqa 88(up), %xmm1
pxor %xmm5, %xmm3
movdqa %xmm3, 112(rp)
palignr($8, %xmm1, %xmm2)
movdqa 72(up), %xmm0
pxor %xmm5, %xmm2
movdqa %xmm2, 96(rp)
palignr($8, %xmm0, %xmm1)
movdqa 56(up), %xmm3
pxor %xmm5, %xmm1
movdqa %xmm1, 80(rp)
palignr($8, %xmm3, %xmm0)
movdqa 40(up), %xmm2
pxor %xmm5, %xmm0
movdqa %xmm0, 64(rp)
palignr($8, %xmm2, %xmm3)
movdqa 24(up), %xmm1
pxor %xmm5, %xmm3
movdqa %xmm3, 48(rp)
palignr($8, %xmm1, %xmm2)
movdqa 8(up), %xmm0
pxor %xmm5, %xmm2
movdqa %xmm2, 32(rp)
palignr($8, %xmm0, %xmm1)
movdqa -8(up), %xmm3
pxor %xmm5, %xmm1
movdqa %xmm1, 16(rp)
palignr($8, %xmm3, %xmm0)
lea 128(up), up
lea 128(rp), rp
jnc L(utop)
pxor %xmm5, %xmm0
movdqa %xmm0, -128(rp)
L(uend):test $8, R8(n)
jz 1f
movdqa 56(up), %xmm3
movdqa 40(up), %xmm2
palignr($8, %xmm2, %xmm3)
movdqa 24(up), %xmm1
pxor %xmm5, %xmm3
movdqa %xmm3, 48(rp)
palignr($8, %xmm1, %xmm2)
movdqa 8(up), %xmm0
pxor %xmm5, %xmm2
movdqa %xmm2, 32(rp)
palignr($8, %xmm0, %xmm1)
movdqa -8(up), %xmm3
pxor %xmm5, %xmm1
movdqa %xmm1, 16(rp)
palignr($8, %xmm3, %xmm0)
lea 64(up), up
pxor %xmm5, %xmm0
movdqa %xmm0, (rp)
lea 64(rp), rp
1: test $4, R8(n)
jz 1f
movdqa 24(up), %xmm1
movdqa 8(up), %xmm0
palignr($8, %xmm0, %xmm1)
movdqa -8(up), %xmm3
pxor %xmm5, %xmm1
movdqa %xmm1, 16(rp)
palignr($8, %xmm3, %xmm0)
lea 32(up), up
pxor %xmm5, %xmm0
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
pxor %xmm5, %xmm0
movdqa %xmm0, (rp)
lea 16(rp), rp
1: test $1, R8(n)
jz 1f
mov (up), %r8
not %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)
ifelse(eval(1 || COM_SSE_THRESHOLD >= 8),1,
`
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
not %r8
not %r9
not %r10
not %r11
mov %r8, -24(rp)
mov %r9, -16(rp)
ifelse(eval(1 || COM_SSE_THRESHOLD >= 8),1,
`
sub $4, R32(n)
')
mov %r10, -8(rp)
mov %r11, (rp)
ifelse(eval(1 || COM_SSE_THRESHOLD >= 8),1,
` jnc L(top)
')
L(
end): test $1, R8(n)
jz 1f
mov (up), %r8
not %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
not %r8
not %r9
mov %r8, 8(rp)
mov %r9, 16(rp)
1: FUNC_EXIT()
ret
EPILOGUE()
