mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 14:30:06 +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.
338 lines
6.2 KiB
ArmAsm
338 lines
6.2 KiB
ArmAsm
/* memrchr 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>
|
|
|
|
# define VMOVA vmovdqa64
|
|
|
|
# define YMMMATCH ymm16
|
|
|
|
# define VEC_SIZE 32
|
|
|
|
.section .text.evex,"ax",@progbits
|
|
ENTRY (__memrchr_evex)
|
|
/* Broadcast CHAR to YMMMATCH. */
|
|
vpbroadcastb %esi, %YMMMATCH
|
|
|
|
sub $VEC_SIZE, %RDX_LP
|
|
jbe L(last_vec_or_less)
|
|
|
|
add %RDX_LP, %RDI_LP
|
|
|
|
/* Check the last VEC_SIZE bytes. */
|
|
vpcmpb $0, (%rdi), %YMMMATCH, %k1
|
|
kmovd %k1, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x0)
|
|
|
|
subq $(VEC_SIZE * 4), %rdi
|
|
movl %edi, %ecx
|
|
andl $(VEC_SIZE - 1), %ecx
|
|
jz L(aligned_more)
|
|
|
|
/* Align data for aligned loads in the loop. */
|
|
addq $VEC_SIZE, %rdi
|
|
addq $VEC_SIZE, %rdx
|
|
andq $-VEC_SIZE, %rdi
|
|
subq %rcx, %rdx
|
|
|
|
.p2align 4
|
|
L(aligned_more):
|
|
subq $(VEC_SIZE * 4), %rdx
|
|
jbe L(last_4x_vec_or_less)
|
|
|
|
/* Check the last 4 * VEC_SIZE. Only one VEC_SIZE at a time
|
|
since data is only aligned to VEC_SIZE. */
|
|
vpcmpb $0, (VEC_SIZE * 3)(%rdi), %YMMMATCH, %k1
|
|
kmovd %k1, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x3)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k2
|
|
kmovd %k2, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x2)
|
|
|
|
vpcmpb $0, VEC_SIZE(%rdi), %YMMMATCH, %k3
|
|
kmovd %k3, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x1)
|
|
|
|
vpcmpb $0, (%rdi), %YMMMATCH, %k4
|
|
kmovd %k4, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x0)
|
|
|
|
/* Align data to 4 * VEC_SIZE for loop with fewer branches.
|
|
There are some overlaps with above if data isn't aligned
|
|
to 4 * VEC_SIZE. */
|
|
movl %edi, %ecx
|
|
andl $(VEC_SIZE * 4 - 1), %ecx
|
|
jz L(loop_4x_vec)
|
|
|
|
addq $(VEC_SIZE * 4), %rdi
|
|
addq $(VEC_SIZE * 4), %rdx
|
|
andq $-(VEC_SIZE * 4), %rdi
|
|
subq %rcx, %rdx
|
|
|
|
.p2align 4
|
|
L(loop_4x_vec):
|
|
/* Compare 4 * VEC at a time forward. */
|
|
subq $(VEC_SIZE * 4), %rdi
|
|
subq $(VEC_SIZE * 4), %rdx
|
|
jbe L(last_4x_vec_or_less)
|
|
|
|
vpcmpb $0, (%rdi), %YMMMATCH, %k1
|
|
vpcmpb $0, VEC_SIZE(%rdi), %YMMMATCH, %k2
|
|
kord %k1, %k2, %k5
|
|
vpcmpb $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k3
|
|
vpcmpb $0, (VEC_SIZE * 3)(%rdi), %YMMMATCH, %k4
|
|
|
|
kord %k3, %k4, %k6
|
|
kortestd %k5, %k6
|
|
jz L(loop_4x_vec)
|
|
|
|
/* There is a match. */
|
|
kmovd %k4, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x3)
|
|
|
|
kmovd %k3, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x2)
|
|
|
|
kmovd %k2, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x1)
|
|
|
|
kmovd %k1, %eax
|
|
bsrl %eax, %eax
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_4x_vec_or_less):
|
|
addl $(VEC_SIZE * 4), %edx
|
|
cmpl $(VEC_SIZE * 2), %edx
|
|
jbe L(last_2x_vec)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 3)(%rdi), %YMMMATCH, %k1
|
|
kmovd %k1, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x3)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k2
|
|
kmovd %k2, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x2)
|
|
|
|
vpcmpb $0, VEC_SIZE(%rdi), %YMMMATCH, %k3
|
|
kmovd %k3, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x1_check)
|
|
cmpl $(VEC_SIZE * 3), %edx
|
|
jbe L(zero)
|
|
|
|
vpcmpb $0, (%rdi), %YMMMATCH, %k4
|
|
kmovd %k4, %eax
|
|
testl %eax, %eax
|
|
jz L(zero)
|
|
bsrl %eax, %eax
|
|
subq $(VEC_SIZE * 4), %rdx
|
|
addq %rax, %rdx
|
|
jl L(zero)
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_2x_vec):
|
|
vpcmpb $0, (VEC_SIZE * 3)(%rdi), %YMMMATCH, %k1
|
|
kmovd %k1, %eax
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x3_check)
|
|
cmpl $VEC_SIZE, %edx
|
|
jbe L(zero)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 2)(%rdi), %YMMMATCH, %k1
|
|
kmovd %k1, %eax
|
|
testl %eax, %eax
|
|
jz L(zero)
|
|
bsrl %eax, %eax
|
|
subq $(VEC_SIZE * 2), %rdx
|
|
addq %rax, %rdx
|
|
jl L(zero)
|
|
addl $(VEC_SIZE * 2), %eax
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_vec_x0):
|
|
bsrl %eax, %eax
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_vec_x1):
|
|
bsrl %eax, %eax
|
|
addl $VEC_SIZE, %eax
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_vec_x2):
|
|
bsrl %eax, %eax
|
|
addl $(VEC_SIZE * 2), %eax
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_vec_x3):
|
|
bsrl %eax, %eax
|
|
addl $(VEC_SIZE * 3), %eax
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_vec_x1_check):
|
|
bsrl %eax, %eax
|
|
subq $(VEC_SIZE * 3), %rdx
|
|
addq %rax, %rdx
|
|
jl L(zero)
|
|
addl $VEC_SIZE, %eax
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_vec_x3_check):
|
|
bsrl %eax, %eax
|
|
subq $VEC_SIZE, %rdx
|
|
addq %rax, %rdx
|
|
jl L(zero)
|
|
addl $(VEC_SIZE * 3), %eax
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(zero):
|
|
xorl %eax, %eax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_vec_or_less_aligned):
|
|
movl %edx, %ecx
|
|
|
|
vpcmpb $0, (%rdi), %YMMMATCH, %k1
|
|
|
|
movl $1, %edx
|
|
/* Support rdx << 32. */
|
|
salq %cl, %rdx
|
|
subq $1, %rdx
|
|
|
|
kmovd %k1, %eax
|
|
|
|
/* Remove the trailing bytes. */
|
|
andl %edx, %eax
|
|
testl %eax, %eax
|
|
jz L(zero)
|
|
|
|
bsrl %eax, %eax
|
|
addq %rdi, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_vec_or_less):
|
|
addl $VEC_SIZE, %edx
|
|
|
|
/* Check for zero length. */
|
|
testl %edx, %edx
|
|
jz L(zero)
|
|
|
|
movl %edi, %ecx
|
|
andl $(VEC_SIZE - 1), %ecx
|
|
jz L(last_vec_or_less_aligned)
|
|
|
|
movl %ecx, %esi
|
|
movl %ecx, %r8d
|
|
addl %edx, %esi
|
|
andq $-VEC_SIZE, %rdi
|
|
|
|
subl $VEC_SIZE, %esi
|
|
ja L(last_vec_2x_aligned)
|
|
|
|
/* Check the last VEC. */
|
|
vpcmpb $0, (%rdi), %YMMMATCH, %k1
|
|
kmovd %k1, %eax
|
|
|
|
/* Remove the leading and trailing bytes. */
|
|
sarl %cl, %eax
|
|
movl %edx, %ecx
|
|
|
|
movl $1, %edx
|
|
sall %cl, %edx
|
|
subl $1, %edx
|
|
|
|
andl %edx, %eax
|
|
testl %eax, %eax
|
|
jz L(zero)
|
|
|
|
bsrl %eax, %eax
|
|
addq %rdi, %rax
|
|
addq %r8, %rax
|
|
ret
|
|
|
|
.p2align 4
|
|
L(last_vec_2x_aligned):
|
|
movl %esi, %ecx
|
|
|
|
/* Check the last VEC. */
|
|
vpcmpb $0, VEC_SIZE(%rdi), %YMMMATCH, %k1
|
|
|
|
movl $1, %edx
|
|
sall %cl, %edx
|
|
subl $1, %edx
|
|
|
|
kmovd %k1, %eax
|
|
|
|
/* Remove the trailing bytes. */
|
|
andl %edx, %eax
|
|
|
|
testl %eax, %eax
|
|
jnz L(last_vec_x1)
|
|
|
|
/* Check the second last VEC. */
|
|
vpcmpb $0, (%rdi), %YMMMATCH, %k1
|
|
|
|
movl %r8d, %ecx
|
|
|
|
kmovd %k1, %eax
|
|
|
|
/* Remove the leading bytes. Must use unsigned right shift for
|
|
bsrl below. */
|
|
shrl %cl, %eax
|
|
testl %eax, %eax
|
|
jz L(zero)
|
|
|
|
bsrl %eax, %eax
|
|
addq %rdi, %rax
|
|
addq %r8, %rax
|
|
ret
|
|
END (__memrchr_evex)
|
|
#endif
|