mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-29 16:21:07 +00:00
398 lines
8.9 KiB
ArmAsm
398 lines
8.9 KiB
ArmAsm
/* strcpy with AVX2
|
|
Copyright (C) 2011-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <isa-level.h>
|
|
|
|
#if ISA_SHOULD_BUILD (3)
|
|
|
|
# include <sysdep.h>
|
|
|
|
# ifndef VEC_SIZE
|
|
# include "x86-avx-vecs.h"
|
|
# endif
|
|
|
|
# ifndef STRCPY
|
|
# define STRCPY __strcpy_avx2
|
|
# endif
|
|
|
|
/* Use movsb in page cross case to save code size. */
|
|
# define USE_MOVSB_IN_PAGE_CROSS 1
|
|
|
|
# ifdef USE_AS_WCSCPY
|
|
# define VPCMPEQ vpcmpeqd
|
|
# define VPMIN vpminud
|
|
# define CHAR_SIZE 4
|
|
# else
|
|
# define VPCMPEQ vpcmpeqb
|
|
# define VPMIN vpminub
|
|
# define CHAR_SIZE 1
|
|
# endif
|
|
|
|
# define PAGE_SIZE 4096
|
|
|
|
# ifdef USE_AS_STPCPY
|
|
# define END_REG rax
|
|
# else
|
|
# define END_REG rdi, %rdx
|
|
# endif
|
|
|
|
# ifdef USE_AS_STRCAT
|
|
# define PAGE_ALIGN_REG ecx
|
|
# else
|
|
# define PAGE_ALIGN_REG eax
|
|
# endif
|
|
|
|
# define VZERO VMM(7)
|
|
# define VZERO_128 VMM_128(7)
|
|
|
|
.section SECTION(.text), "ax", @progbits
|
|
ENTRY(STRCPY)
|
|
vpxor %VZERO_128, %VZERO_128, %VZERO_128
|
|
|
|
# ifdef USE_AS_STRCAT
|
|
movq %rdi, %rax
|
|
# include "strcat-strlen-avx2.h.S"
|
|
# endif
|
|
|
|
movl %esi, %PAGE_ALIGN_REG
|
|
andl $(PAGE_SIZE - 1), %PAGE_ALIGN_REG
|
|
cmpl $(PAGE_SIZE - VEC_SIZE), %PAGE_ALIGN_REG
|
|
ja L(page_cross)
|
|
L(page_cross_continue):
|
|
# if !defined USE_AS_STPCPY && !defined USE_AS_STRCAT
|
|
movq %rdi, %rax
|
|
# endif
|
|
VMOVU (%rsi), %VMM(0)
|
|
VPCMPEQ %VMM(0), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %ecx
|
|
|
|
testl %ecx, %ecx
|
|
jz L(more_1x_vec)
|
|
|
|
/* No longer need ymm registers so just vzeroupper so it doesn't
|
|
need to be duplicated at each return statement. */
|
|
COND_VZEROUPPER
|
|
|
|
xorl %edx, %edx
|
|
bsfl %ecx, %edx
|
|
# ifdef USE_AS_STPCPY
|
|
leaq (%rdi, %rdx), %rax
|
|
# endif
|
|
|
|
/* Use mask bits in rcx to detect which copy we need. If the low
|
|
mask is zero then there must be a bit set in the upper half.
|
|
I.e if ecx != 0 and cx == 0, then match must be upper 16
|
|
bits so we use L(copy_16_31). */
|
|
testw %cx, %cx
|
|
jz L(copy_16_31)
|
|
|
|
testb %cl, %cl
|
|
jz L(copy_8_15)
|
|
# ifdef USE_AS_WCSCPY
|
|
vmovd %xmm0, (%rdi)
|
|
movl $0, (%END_REG)
|
|
ret
|
|
# else
|
|
testb $0x7, %cl
|
|
jz L(copy_4_7)
|
|
|
|
testl %edx, %edx
|
|
jz L(set_null_term)
|
|
vmovd %xmm0, %ecx
|
|
movw %cx, (%rdi)
|
|
|
|
.p2align 4,, 2
|
|
L(set_null_term):
|
|
movb $0, (%END_REG)
|
|
ret
|
|
|
|
.p2align 4,, 12
|
|
L(copy_4_7):
|
|
movl -3(%rsi, %rdx), %ecx
|
|
vmovd %xmm0, (%rdi)
|
|
movl %ecx, -3(%END_REG)
|
|
ret
|
|
# endif
|
|
|
|
.p2align 4,, 10
|
|
L(copy_16_31):
|
|
VMOVU -(16 - CHAR_SIZE)(%rsi, %rdx), %xmm1
|
|
VMOVU %xmm0, (%rdi)
|
|
VMOVU %xmm1, -(16 - CHAR_SIZE)(%END_REG)
|
|
ret
|
|
|
|
.p2align 4,, 10
|
|
L(copy_8_15):
|
|
# ifdef USE_AS_WCSCPY
|
|
movl -(8 - CHAR_SIZE)(%rsi, %rdx), %ecx
|
|
# else
|
|
movq -(8 - CHAR_SIZE)(%rsi, %rdx), %rcx
|
|
# endif
|
|
vmovq %xmm0, (%rdi)
|
|
movq %rcx, -(8 - CHAR_SIZE)(%END_REG)
|
|
ret
|
|
|
|
|
|
.p2align 4,, 8
|
|
L(more_1x_vec):
|
|
# if defined USE_AS_STPCPY || defined USE_AS_STRCAT
|
|
VMOVU %VMM(0), (%rdi)
|
|
# endif
|
|
subq %rsi, %rdi
|
|
orq $(VEC_SIZE - 1), %rsi
|
|
addq %rsi, %rdi
|
|
VMOVA 1(%rsi), %VMM(1)
|
|
|
|
/* Try and order stores after as many loads as is reasonable to
|
|
avoid potential false dependencies. */
|
|
# if !defined USE_AS_STPCPY && !defined USE_AS_STRCAT
|
|
VMOVU %VMM(0), (%rax)
|
|
# endif
|
|
VPCMPEQ %VMM(1), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %ecx
|
|
testl %ecx, %ecx
|
|
jnz L(ret_vec_x1)
|
|
|
|
VMOVA (VEC_SIZE + 1)(%rsi), %VMM(2)
|
|
VMOVU %VMM(1), 1(%rdi)
|
|
|
|
VPCMPEQ %VMM(2), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %ecx
|
|
testl %ecx, %ecx
|
|
jnz L(ret_vec_x2)
|
|
|
|
VMOVA (VEC_SIZE * 2 + 1)(%rsi), %VMM(3)
|
|
VMOVU %VMM(2), (VEC_SIZE + 1)(%rdi)
|
|
|
|
VPCMPEQ %VMM(3), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %ecx
|
|
testl %ecx, %ecx
|
|
jnz L(ret_vec_x3)
|
|
|
|
VMOVA (VEC_SIZE * 3 + 1)(%rsi), %VMM(4)
|
|
VMOVU %VMM(3), (VEC_SIZE * 2 + 1)(%rdi)
|
|
VPCMPEQ %VMM(4), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %edx
|
|
testl %edx, %edx
|
|
jnz L(ret_vec_x4)
|
|
|
|
VMOVU %VMM(4), (VEC_SIZE * 3 + 1)(%rdi)
|
|
|
|
/* Subtract rsi from rdi before aligning. Adding back rsi will
|
|
get proper rdi (dst) for new src. */
|
|
subq %rsi, %rdi
|
|
incq %rsi
|
|
orq $(VEC_SIZE * 4 - 1), %rsi
|
|
|
|
/* Do first half of loop ahead of time so loop can just start by
|
|
storing. */
|
|
VMOVA (VEC_SIZE * 0 + 1)(%rsi), %VMM(0)
|
|
VMOVA (VEC_SIZE * 1 + 1)(%rsi), %VMM(1)
|
|
VMOVA (VEC_SIZE * 2 + 1)(%rsi), %VMM(2)
|
|
VMOVA (VEC_SIZE * 3 + 1)(%rsi), %VMM(3)
|
|
|
|
VPMIN %VMM(0), %VMM(1), %VMM(4)
|
|
VPMIN %VMM(2), %VMM(3), %VMM(6)
|
|
VPMIN %VMM(4), %VMM(6), %VMM(6)
|
|
VPCMPEQ %VMM(6), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %edx
|
|
addq %rsi, %rdi
|
|
|
|
testl %edx, %edx
|
|
jnz L(loop_4x_done)
|
|
|
|
.p2align 4,, 11
|
|
L(loop_4x_vec):
|
|
|
|
VMOVU %VMM(0), (VEC_SIZE * 0 + 1)(%rdi)
|
|
VMOVU %VMM(1), (VEC_SIZE * 1 + 1)(%rdi)
|
|
subq $(VEC_SIZE * -4), %rsi
|
|
VMOVU %VMM(2), (VEC_SIZE * 2 + 1)(%rdi)
|
|
VMOVU %VMM(3), (VEC_SIZE * 3 + 1)(%rdi)
|
|
|
|
|
|
VMOVA (VEC_SIZE * 0 + 1)(%rsi), %VMM(0)
|
|
VMOVA (VEC_SIZE * 1 + 1)(%rsi), %VMM(1)
|
|
VMOVA (VEC_SIZE * 2 + 1)(%rsi), %VMM(2)
|
|
VMOVA (VEC_SIZE * 3 + 1)(%rsi), %VMM(3)
|
|
|
|
VPMIN %VMM(0), %VMM(1), %VMM(4)
|
|
VPMIN %VMM(2), %VMM(3), %VMM(6)
|
|
VPMIN %VMM(4), %VMM(6), %VMM(6)
|
|
VPCMPEQ %VMM(6), %VZERO, %VMM(6)
|
|
|
|
vpmovmskb %VMM(6), %edx
|
|
subq $(VEC_SIZE * -4), %rdi
|
|
testl %edx, %edx
|
|
jz L(loop_4x_vec)
|
|
|
|
L(loop_4x_done):
|
|
VPCMPEQ %VMM(0), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %ecx
|
|
testl %ecx, %ecx
|
|
jnz L(ret_vec_x1)
|
|
VMOVU %VMM(0), (VEC_SIZE * 0 + 1)(%rdi)
|
|
|
|
VPCMPEQ %VMM(1), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %ecx
|
|
testl %ecx, %ecx
|
|
jnz L(ret_vec_x2)
|
|
VMOVU %VMM(1), (VEC_SIZE * 1 + 1)(%rdi)
|
|
|
|
VPCMPEQ %VMM(2), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %ecx
|
|
testl %ecx, %ecx
|
|
jnz L(ret_vec_x3)
|
|
VMOVU %VMM(2), (VEC_SIZE * 2 + 1)(%rdi)
|
|
L(ret_vec_x4):
|
|
bsfl %edx, %edx
|
|
VMOVU ((VEC_SIZE * 3 + 1)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rdx), %VMM(1)
|
|
VMOVU %VMM(1), ((VEC_SIZE * 3 + 1)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rdx)
|
|
# ifdef USE_AS_STPCPY
|
|
leaq (VEC_SIZE * 3 + 1)(%rdx, %rdi), %rax
|
|
# endif
|
|
L(return_end):
|
|
VZEROUPPER_RETURN
|
|
|
|
.p2align 4,, 8
|
|
L(ret_vec_x1):
|
|
bsfl %ecx, %ecx
|
|
VMOVU (1 -(VEC_SIZE - CHAR_SIZE))(%rsi, %rcx), %VMM(1)
|
|
VMOVU %VMM(1), (1 -(VEC_SIZE - CHAR_SIZE))(%rdi, %rcx)
|
|
# ifdef USE_AS_STPCPY
|
|
leaq 1(%rcx, %rdi), %rax
|
|
# endif
|
|
L(return_vzeroupper):
|
|
ZERO_UPPER_VEC_REGISTERS_RETURN
|
|
|
|
.p2align 4,, 8
|
|
L(ret_vec_x2):
|
|
bsfl %ecx, %ecx
|
|
VMOVU ((VEC_SIZE + 1)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rcx), %VMM(1)
|
|
VMOVU %VMM(1), ((VEC_SIZE + 1)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rcx)
|
|
# ifdef USE_AS_STPCPY
|
|
leaq (VEC_SIZE * 1 + 1)(%rcx, %rdi), %rax
|
|
# endif
|
|
VZEROUPPER_RETURN
|
|
|
|
.p2align 4,, 8
|
|
L(ret_vec_x3):
|
|
bsfl %ecx, %ecx
|
|
VMOVU ((VEC_SIZE * 2 + 1)-(VEC_SIZE - CHAR_SIZE))(%rsi, %rcx), %VMM(1)
|
|
VMOVU %VMM(1), ((VEC_SIZE * 2 + 1)-(VEC_SIZE - CHAR_SIZE))(%rdi, %rcx)
|
|
# ifdef USE_AS_STPCPY
|
|
leaq (VEC_SIZE * 2 + 1)(%rcx, %rdi), %rax
|
|
# endif
|
|
VZEROUPPER_RETURN
|
|
|
|
|
|
.p2align 4,, 4
|
|
L(page_cross):
|
|
movq %rsi, %rcx
|
|
andq $(VEC_SIZE * -1), %rcx
|
|
|
|
VPCMPEQ (%rcx), %VZERO, %VMM(6)
|
|
vpmovmskb %VMM(6), %ecx
|
|
shrxl %esi, %ecx, %ecx
|
|
# if USE_MOVSB_IN_PAGE_CROSS
|
|
/* Optimizing more aggressively for space as this is very cold
|
|
code. This saves 2x cache lines. */
|
|
|
|
/* This adds once to the later result which will get correct
|
|
copy bounds. NB: this can never zero-out a non-zero RCX as
|
|
to be in the page cross case rsi cannot be aligned and we
|
|
already right-shift rcx by the misalignment. */
|
|
shll $CHAR_SIZE, %ecx
|
|
jz L(page_cross_continue)
|
|
bsfl %ecx, %ecx
|
|
# if !defined USE_AS_STPCPY && !defined USE_AS_STRCAT
|
|
movq %rdi, %rax
|
|
# endif
|
|
rep movsb
|
|
# ifdef USE_AS_STPCPY
|
|
leaq -CHAR_SIZE(%rdi), %rax
|
|
# endif
|
|
|
|
VZEROUPPER_RETURN
|
|
|
|
# else
|
|
testl %ecx, %ecx
|
|
jz L(page_cross_continue)
|
|
|
|
/* Traditional copy case, essentially same as used in non-page-
|
|
cross case but since we can't reuse VMM(0) we need twice as
|
|
many loads from rsi. */
|
|
# ifndef USE_AS_STRCAT
|
|
xorl %edx, %edx
|
|
# endif
|
|
bsfl %ecx, %edx
|
|
# ifdef USE_AS_STPCPY
|
|
leaq (%rdi, %rdx), %rax
|
|
# elif !defined USE_AS_STRCAT
|
|
movq %rdi, %rax
|
|
# endif
|
|
|
|
/* vzeroupper early to avoid duplicating at each return. */
|
|
COND_VZEROUPPER
|
|
|
|
testw %cx, %cx
|
|
jz L(page_cross_copy_16_31)
|
|
|
|
testb %cl, %cl
|
|
jz L(page_cross_copy_8_15)
|
|
|
|
testl $0x7, %cl
|
|
jz L(page_cross_copy_4_7)
|
|
|
|
testl %edx, %edx
|
|
jz L(page_cross_set_null_term)
|
|
movzwl (%rsi), %ecx
|
|
movw %cx, (%rdi)
|
|
L(page_cross_set_null_term):
|
|
movb $0, (%END_REG)
|
|
ret
|
|
|
|
.p2align 4,, 4
|
|
L(page_cross_copy_4_7):
|
|
movl (%rsi), %ecx
|
|
movl -3(%rsi, %rdx), %esi
|
|
movl %ecx, (%rdi)
|
|
movl %esi, -3(%END_REG)
|
|
ret
|
|
|
|
.p2align 4,, 4
|
|
L(page_cross_copy_8_15):
|
|
movq (%rsi), %rcx
|
|
movq -7(%rsi, %rdx), %rsi
|
|
movq %rcx, (%rdi)
|
|
movq %rsi, -7(%END_REG)
|
|
ret
|
|
|
|
|
|
.p2align 4,, 3
|
|
L(page_cross_copy_16_31):
|
|
VMOVU (%rsi), %xmm0
|
|
VMOVU -15(%rsi, %rdx), %xmm1
|
|
VMOVU %xmm0, (%rdi)
|
|
VMOVU %xmm1, -15(%END_REG)
|
|
ret
|
|
# endif
|
|
|
|
END(STRCPY)
|
|
#endif
|