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dnl AMD64 mpn_copyi optimised for CPUs with fast SSE copying and SSSE3.
dnl Copyright 2012 Free Software Foundation, Inc.
dnl Contributed to the GNU project by Torbjorn Granlund.
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 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 bobcat 1.97 ? 8.17 1.5/1.5 N
C Intel P4 2.26 illop Y/N
C Intel core2 0.52 0.82 opt/0.74 Y
C Intel NHM 0.52 0.65 opt/opt Y
C Intel SBR 0.51 0.55 opt/0.51 Y
C Intel atom 1.16 1.70 opt/opt Y
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 < 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.
define(`movdqa', ``movaps'')
ifdef(`COPYI_SSE_THRESHOLD',`',`define(`COPYI_SSE_THRESHOLD', 7)')
ASM_START()
TEXT
ALIGN(64)
PROLOGUE(mpn_copyi)
DOS64_ENTRY(3)
cmp $COPYI_SSE_THRESHOLD, n
jbe L(bc)
bt $3, R32(rp) C is rp 16-byte aligned?
jnc L(rp_aligned) C jump if rp aligned
movsq C copy one limb
dec n
L(rp_aligned):
bt $3, R32(up)
jc 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)
bt $2, R32(n)
jnc 1f
movdqa (up), %xmm0
movdqa 16(up), %xmm1
lea 32(up), up
movdqa %xmm0, (rp)
movdqa %xmm1, 16(rp)
lea 32(rp), rp
1: bt $1, R32(n)
jnc 1f
movdqa (up), %xmm0
lea 16(up), up
movdqa %xmm0, (rp)
lea 16(rp), rp
1: bt $0, n
jnc 1f
mov (up), %r8
mov %r8, (rp)
1: DOS64_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
movdqa %xmm0, -128(rp)
sub $16, n
L(um): movdqa 104(up), %xmm2
palignr($8, %xmm2, %xmm3)
movdqa 88(up), %xmm1
movdqa %xmm3, 112(rp)
palignr($8, %xmm1, %xmm2)
movdqa 72(up), %xmm0
movdqa %xmm2, 96(rp)
palignr($8, %xmm0, %xmm1)
movdqa 56(up), %xmm3
movdqa %xmm1, 80(rp)
palignr($8, %xmm3, %xmm0)
movdqa 40(up), %xmm2
movdqa %xmm0, 64(rp)
palignr($8, %xmm2, %xmm3)
movdqa 24(up), %xmm1
movdqa %xmm3, 48(rp)
palignr($8, %xmm1, %xmm2)
movdqa 8(up), %xmm0
movdqa %xmm2, 32(rp)
palignr($8, %xmm0, %xmm1)
movdqa -8(up), %xmm3
movdqa %xmm1, 16(rp)
palignr($8, %xmm3, %xmm0)
lea 128(up), up
lea 128(rp), rp
jnc L(utop)
movdqa %xmm0, -128(rp)
L(uend):bt $3, R32(n)
jnc 1f
movdqa 56(up), %xmm3
movdqa 40(up), %xmm2
palignr($8, %xmm2, %xmm3)
movdqa 24(up), %xmm1
movdqa %xmm3, 48(rp)
palignr($8, %xmm1, %xmm2)
movdqa 8(up), %xmm0
movdqa %xmm2, 32(rp)
palignr($8, %xmm0, %xmm1)
movdqa -8(up), %xmm3
movdqa %xmm1, 16(rp)
palignr($8, %xmm3, %xmm0)
lea 64(up), up
movdqa %xmm0, (rp)
lea 64(rp), rp
1: bt $2, R32(n)
jnc 1f
movdqa 24(up), %xmm1
movdqa 8(up), %xmm0
palignr($8, %xmm0, %xmm1)
movdqa -8(up), %xmm3
movdqa %xmm1, 16(rp)
palignr($8, %xmm3, %xmm0)
lea 32(up), up
movdqa %xmm0, (rp)
lea 32(rp), rp
1: bt $1, R32(n)
jnc 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: bt $0, n
jnc 1f
mov (up), %r8
mov %r8, (rp)
1: DOS64_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(1 || COPYI_SSE_THRESHOLD >= 8),1,
` sub $4, R32(n)')
mov %r10, -8(rp)
mov %r11, (rp)
ifelse(eval(1 || COPYI_SSE_THRESHOLD >= 8),1,
` jnc L(top)')
L(end): bt $0, R32(n)
jnc 1f
mov (up), %r8
mov %r8, 8(rp)
lea 8(rp), rp
lea 8(up), up
1: bt $1, R32(n)
jnc 1f
mov (up), %r8
mov 8(up), %r9
mov %r8, 8(rp)
mov %r9, 16(rp)
1: DOS64_EXIT()
ret
EPILOGUE()
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