mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 13:50:06 +00:00
1fd8c163a8
Update ifunc-avx2.h, strchr.c, strcmp.c, strncmp.c and wcsnlen.c to select the function optimized with 256-bit EVEX instructions using YMM16-YMM31 registers to avoid RTM abort with usable AVX512VL, AVX512BW and BMI2 since VZEROUPPER isn't needed at function exit. For strcmp/strncmp, prefer AVX2 strcmp/strncmp if Prefer_AVX2_STRCMP is set.
266 lines
5.8 KiB
ArmAsm
266 lines
5.8 KiB
ArmAsm
/* strrchr/wcsrchr optimized with 256-bit EVEX instructions.
|
|
Copyright (C) 2021 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/>. */
|
|
|
|
#if IS_IN (libc)
|
|
|
|
# include <sysdep.h>
|
|
|
|
# ifndef STRRCHR
|
|
# define STRRCHR __strrchr_evex
|
|
# endif
|
|
|
|
# define VMOVU vmovdqu64
|
|
# define VMOVA vmovdqa64
|
|
|
|
# ifdef USE_AS_WCSRCHR
|
|
# define VPBROADCAST vpbroadcastd
|
|
# define VPCMP vpcmpd
|
|
# define SHIFT_REG r8d
|
|
# else
|
|
# define VPBROADCAST vpbroadcastb
|
|
# define VPCMP vpcmpb
|
|
# define SHIFT_REG ecx
|
|
# endif
|
|
|
|
# define XMMZERO xmm16
|
|
# define YMMZERO ymm16
|
|
# define YMMMATCH ymm17
|
|
# define YMM1 ymm18
|
|
|
|
# define VEC_SIZE 32
|
|
|
|
.section .text.evex,"ax",@progbits
|
|
ENTRY (STRRCHR)
|
|
movl %edi, %ecx
|
|
/* Broadcast CHAR to YMMMATCH. */
|
|
VPBROADCAST %esi, %YMMMATCH
|
|
|
|
vpxorq %XMMZERO, %XMMZERO, %XMMZERO
|
|
|
|
/* Check if we may cross page boundary with one vector load. */
|
|
andl $(2 * VEC_SIZE - 1), %ecx
|
|
cmpl $VEC_SIZE, %ecx
|
|
ja L(cros_page_boundary)
|
|
|
|
VMOVU (%rdi), %YMM1
|
|
|
|
/* Each bit in K0 represents a null byte in YMM1. */
|
|
VPCMP $0, %YMMZERO, %YMM1, %k0
|
|
/* Each bit in K1 represents a CHAR in YMM1. */
|
|
VPCMP $0, %YMMMATCH, %YMM1, %k1
|
|
kmovd %k0, %ecx
|
|
kmovd %k1, %eax
|
|
|
|
addq $VEC_SIZE, %rdi
|
|
|
|
testl %eax, %eax
|
|
jnz L(first_vec)
|
|
|
|
testl %ecx, %ecx
|
|
jnz L(return_null)
|
|
|
|
andq $-VEC_SIZE, %rdi
|
|
xorl %edx, %edx
|
|
jmp L(aligned_loop)
|
|
|
|
.p2align 4
|
|
L(first_vec):
|
|
/* Check if there is a null byte. */
|
|
testl %ecx, %ecx
|
|
jnz L(char_and_nul_in_first_vec)
|
|
|
|
/* Remember the match and keep searching. */
|
|
movl %eax, %edx
|
|
movq %rdi, %rsi
|
|
andq $-VEC_SIZE, %rdi
|
|
jmp L(aligned_loop)
|
|
|
|
.p2align 4
|
|
L(cros_page_boundary):
|
|
andl $(VEC_SIZE - 1), %ecx
|
|
andq $-VEC_SIZE, %rdi
|
|
|
|
# ifdef USE_AS_WCSRCHR
|
|
/* NB: Divide shift count by 4 since each bit in K1 represent 4
|
|
bytes. */
|
|
movl %ecx, %SHIFT_REG
|
|
sarl $2, %SHIFT_REG
|
|
# endif
|
|
|
|
VMOVA (%rdi), %YMM1
|
|
|
|
/* Each bit in K0 represents a null byte in YMM1. */
|
|
VPCMP $0, %YMMZERO, %YMM1, %k0
|
|
/* Each bit in K1 represents a CHAR in YMM1. */
|
|
VPCMP $0, %YMMMATCH, %YMM1, %k1
|
|
kmovd %k0, %edx
|
|
kmovd %k1, %eax
|
|
|
|
shrxl %SHIFT_REG, %edx, %edx
|
|
shrxl %SHIFT_REG, %eax, %eax
|
|
addq $VEC_SIZE, %rdi
|
|
|
|
/* Check if there is a CHAR. */
|
|
testl %eax, %eax
|
|
jnz L(found_char)
|
|
|
|
testl %edx, %edx
|
|
jnz L(return_null)
|
|
|
|
jmp L(aligned_loop)
|
|
|
|
.p2align 4
|
|
L(found_char):
|
|
testl %edx, %edx
|
|
jnz L(char_and_nul)
|
|
|
|
/* Remember the match and keep searching. */
|
|
movl %eax, %edx
|
|
leaq (%rdi, %rcx), %rsi
|
|
|
|
.p2align 4
|
|
L(aligned_loop):
|
|
VMOVA (%rdi), %YMM1
|
|
addq $VEC_SIZE, %rdi
|
|
|
|
/* Each bit in K0 represents a null byte in YMM1. */
|
|
VPCMP $0, %YMMZERO, %YMM1, %k0
|
|
/* Each bit in K1 represents a CHAR in YMM1. */
|
|
VPCMP $0, %YMMMATCH, %YMM1, %k1
|
|
kmovd %k0, %ecx
|
|
kmovd %k1, %eax
|
|
orl %eax, %ecx
|
|
jnz L(char_nor_null)
|
|
|
|
VMOVA (%rdi), %YMM1
|
|
add $VEC_SIZE, %rdi
|
|
|
|
/* Each bit in K0 represents a null byte in YMM1. */
|
|
VPCMP $0, %YMMZERO, %YMM1, %k0
|
|
/* Each bit in K1 represents a CHAR in YMM1. */
|
|
VPCMP $0, %YMMMATCH, %YMM1, %k1
|
|
kmovd %k0, %ecx
|
|
kmovd %k1, %eax
|
|
orl %eax, %ecx
|
|
jnz L(char_nor_null)
|
|
|
|
VMOVA (%rdi), %YMM1
|
|
addq $VEC_SIZE, %rdi
|
|
|
|
/* Each bit in K0 represents a null byte in YMM1. */
|
|
VPCMP $0, %YMMZERO, %YMM1, %k0
|
|
/* Each bit in K1 represents a CHAR in YMM1. */
|
|
VPCMP $0, %YMMMATCH, %YMM1, %k1
|
|
kmovd %k0, %ecx
|
|
kmovd %k1, %eax
|
|
orl %eax, %ecx
|
|
jnz L(char_nor_null)
|
|
|
|
VMOVA (%rdi), %YMM1
|
|
addq $VEC_SIZE, %rdi
|
|
|
|
/* Each bit in K0 represents a null byte in YMM1. */
|
|
VPCMP $0, %YMMZERO, %YMM1, %k0
|
|
/* Each bit in K1 represents a CHAR in YMM1. */
|
|
VPCMP $0, %YMMMATCH, %YMM1, %k1
|
|
kmovd %k0, %ecx
|
|
kmovd %k1, %eax
|
|
orl %eax, %ecx
|
|
jz L(aligned_loop)
|
|
|
|
.p2align 4
|
|
L(char_nor_null):
|
|
/* Find a CHAR or a null byte in a loop. */
|
|
testl %eax, %eax
|
|
jnz L(match)
|
|
L(return_value):
|
|
testl %edx, %edx
|
|
jz L(return_null)
|
|
movl %edx, %eax
|
|
movq %rsi, %rdi
|
|
bsrl %eax, %eax
|
|
# ifdef USE_AS_WCSRCHR
|
|
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
|
leaq -VEC_SIZE(%rdi, %rax, 4), %rax
|
|
# else
|
|
leaq -VEC_SIZE(%rdi, %rax), %rax
|
|
# endif
|
|
ret
|
|
|
|
.p2align 4
|
|
L(match):
|
|
/* Find a CHAR. Check if there is a null byte. */
|
|
kmovd %k0, %ecx
|
|
testl %ecx, %ecx
|
|
jnz L(find_nul)
|
|
|
|
/* Remember the match and keep searching. */
|
|
movl %eax, %edx
|
|
movq %rdi, %rsi
|
|
jmp L(aligned_loop)
|
|
|
|
.p2align 4
|
|
L(find_nul):
|
|
/* Mask out any matching bits after the null byte. */
|
|
movl %ecx, %r8d
|
|
subl $1, %r8d
|
|
xorl %ecx, %r8d
|
|
andl %r8d, %eax
|
|
testl %eax, %eax
|
|
/* If there is no CHAR here, return the remembered one. */
|
|
jz L(return_value)
|
|
bsrl %eax, %eax
|
|
# ifdef USE_AS_WCSRCHR
|
|
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
|
leaq -VEC_SIZE(%rdi, %rax, 4), %rax
|
|
# else
|
|
leaq -VEC_SIZE(%rdi, %rax), %rax
|
|
# endif
|
|
ret
|
|
|
|
.p2align 4
|
|
L(char_and_nul):
|
|
/* Find both a CHAR and a null byte. */
|
|
addq %rcx, %rdi
|
|
movl %edx, %ecx
|
|
L(char_and_nul_in_first_vec):
|
|
/* Mask out any matching bits after the null byte. */
|
|
movl %ecx, %r8d
|
|
subl $1, %r8d
|
|
xorl %ecx, %r8d
|
|
andl %r8d, %eax
|
|
testl %eax, %eax
|
|
/* Return null pointer if the null byte comes first. */
|
|
jz L(return_null)
|
|
bsrl %eax, %eax
|
|
# ifdef USE_AS_WCSRCHR
|
|
/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
|
|
leaq -VEC_SIZE(%rdi, %rax, 4), %rax
|
|
# else
|
|
leaq -VEC_SIZE(%rdi, %rax), %rax
|
|
# endif
|
|
ret
|
|
|
|
.p2align 4
|
|
L(return_null):
|
|
xorl %eax, %eax
|
|
ret
|
|
|
|
END (STRRCHR)
|
|
#endif
|