mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-29 08:11:08 +00:00
49889fb256
1. Add default ISA level selection in non-multiarch/rtld
implementations.
2. Add ISA level build guards to different implementations.
- I.e strcpy-avx2.S which is ISA level 3 will only build if
compiled ISA level <= 3. Otherwise there is no reason to
include it as we will always use one of the ISA level 4
implementations (strcpy-evex.S).
3. Refactor the ifunc selector and ifunc implementation list to use
the ISA level aware wrapper macros that allow functions below the
compiled ISA level (with a guranteed replacement) to be skipped.
Tested with and without multiarch on x86_64 for ISA levels:
{generic, x86-64-v2, x86-64-v3, x86-64-v4}
And m32 with and without multiarch.
287 lines
6.2 KiB
ArmAsm
287 lines
6.2 KiB
ArmAsm
/* strcat with 256-bit EVEX instructions.
|
|
Copyright (C) 2021-2022 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 (4)
|
|
|
|
|
|
# include <sysdep.h>
|
|
|
|
# ifndef STRCAT
|
|
# define STRCAT __strcat_evex
|
|
# endif
|
|
|
|
# define VMOVU vmovdqu64
|
|
# define VMOVA vmovdqa64
|
|
|
|
/* zero register */
|
|
# define XMMZERO xmm16
|
|
# define YMMZERO ymm16
|
|
# define YMM0 ymm17
|
|
# define YMM1 ymm18
|
|
|
|
# define USE_AS_STRCAT
|
|
|
|
/* Number of bytes in a vector register */
|
|
# define VEC_SIZE 32
|
|
|
|
.section .text.evex,"ax",@progbits
|
|
ENTRY (STRCAT)
|
|
mov %rdi, %r9
|
|
# ifdef USE_AS_STRNCAT
|
|
mov %rdx, %r8
|
|
# endif
|
|
|
|
xor %eax, %eax
|
|
mov %edi, %ecx
|
|
and $((VEC_SIZE * 4) - 1), %ecx
|
|
vpxorq %XMMZERO, %XMMZERO, %XMMZERO
|
|
cmp $(VEC_SIZE * 3), %ecx
|
|
ja L(fourth_vector_boundary)
|
|
vpcmpb $0, (%rdi), %YMMZERO, %k0
|
|
kmovd %k0, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_first_vector)
|
|
mov %rdi, %rax
|
|
and $-VEC_SIZE, %rax
|
|
jmp L(align_vec_size_start)
|
|
L(fourth_vector_boundary):
|
|
mov %rdi, %rax
|
|
and $-VEC_SIZE, %rax
|
|
vpcmpb $0, (%rax), %YMMZERO, %k0
|
|
mov $-1, %r10d
|
|
sub %rax, %rcx
|
|
shl %cl, %r10d
|
|
kmovd %k0, %edx
|
|
and %r10d, %edx
|
|
jnz L(exit)
|
|
|
|
L(align_vec_size_start):
|
|
vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k0
|
|
kmovd %k0, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_second_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
|
|
kmovd %k1, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_third_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
|
|
kmovd %k2, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_fourth_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
|
|
kmovd %k3, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_fifth_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
|
|
add $(VEC_SIZE * 4), %rax
|
|
kmovd %k4, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_second_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
|
|
kmovd %k1, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_third_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
|
|
kmovd %k2, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_fourth_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
|
|
kmovd %k3, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_fifth_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
|
|
kmovd %k4, %edx
|
|
add $(VEC_SIZE * 4), %rax
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_second_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
|
|
kmovd %k1, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_third_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
|
|
kmovd %k2, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_fourth_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
|
|
kmovd %k3, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_fifth_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
|
|
add $(VEC_SIZE * 4), %rax
|
|
kmovd %k4, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_second_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
|
|
kmovd %k1, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_third_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
|
|
kmovd %k2, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_fourth_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
|
|
kmovd %k3, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_fifth_vector)
|
|
|
|
test $((VEC_SIZE * 4) - 1), %rax
|
|
jz L(align_four_vec_loop)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
|
|
add $(VEC_SIZE * 5), %rax
|
|
kmovd %k4, %edx
|
|
test %edx, %edx
|
|
jnz L(exit)
|
|
|
|
test $((VEC_SIZE * 4) - 1), %rax
|
|
jz L(align_four_vec_loop)
|
|
|
|
vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k0
|
|
add $VEC_SIZE, %rax
|
|
kmovd %k0, %edx
|
|
test %edx, %edx
|
|
jnz L(exit)
|
|
|
|
test $((VEC_SIZE * 4) - 1), %rax
|
|
jz L(align_four_vec_loop)
|
|
|
|
vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k0
|
|
add $VEC_SIZE, %rax
|
|
kmovd %k0, %edx
|
|
test %edx, %edx
|
|
jnz L(exit)
|
|
|
|
test $((VEC_SIZE * 4) - 1), %rax
|
|
jz L(align_four_vec_loop)
|
|
|
|
vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k1
|
|
add $VEC_SIZE, %rax
|
|
kmovd %k1, %edx
|
|
test %edx, %edx
|
|
jnz L(exit)
|
|
|
|
add $VEC_SIZE, %rax
|
|
|
|
.p2align 4
|
|
L(align_four_vec_loop):
|
|
VMOVA (%rax), %YMM0
|
|
VMOVA (VEC_SIZE * 2)(%rax), %YMM1
|
|
vpminub VEC_SIZE(%rax), %YMM0, %YMM0
|
|
vpminub (VEC_SIZE * 3)(%rax), %YMM1, %YMM1
|
|
vpminub %YMM0, %YMM1, %YMM0
|
|
/* If K0 != 0, there is a null byte. */
|
|
vpcmpb $0, %YMM0, %YMMZERO, %k0
|
|
add $(VEC_SIZE * 4), %rax
|
|
ktestd %k0, %k0
|
|
jz L(align_four_vec_loop)
|
|
|
|
vpcmpb $0, -(VEC_SIZE * 4)(%rax), %YMMZERO, %k0
|
|
sub $(VEC_SIZE * 5), %rax
|
|
kmovd %k0, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_second_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
|
|
kmovd %k1, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_third_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
|
|
kmovd %k2, %edx
|
|
test %edx, %edx
|
|
jnz L(exit_null_on_fourth_vector)
|
|
|
|
vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
|
|
kmovd %k3, %edx
|
|
sub %rdi, %rax
|
|
bsf %rdx, %rdx
|
|
add %rdx, %rax
|
|
add $(VEC_SIZE * 4), %rax
|
|
jmp L(StartStrcpyPart)
|
|
|
|
.p2align 4
|
|
L(exit):
|
|
sub %rdi, %rax
|
|
L(exit_null_on_first_vector):
|
|
bsf %rdx, %rdx
|
|
add %rdx, %rax
|
|
jmp L(StartStrcpyPart)
|
|
|
|
.p2align 4
|
|
L(exit_null_on_second_vector):
|
|
sub %rdi, %rax
|
|
bsf %rdx, %rdx
|
|
add %rdx, %rax
|
|
add $VEC_SIZE, %rax
|
|
jmp L(StartStrcpyPart)
|
|
|
|
.p2align 4
|
|
L(exit_null_on_third_vector):
|
|
sub %rdi, %rax
|
|
bsf %rdx, %rdx
|
|
add %rdx, %rax
|
|
add $(VEC_SIZE * 2), %rax
|
|
jmp L(StartStrcpyPart)
|
|
|
|
.p2align 4
|
|
L(exit_null_on_fourth_vector):
|
|
sub %rdi, %rax
|
|
bsf %rdx, %rdx
|
|
add %rdx, %rax
|
|
add $(VEC_SIZE * 3), %rax
|
|
jmp L(StartStrcpyPart)
|
|
|
|
.p2align 4
|
|
L(exit_null_on_fifth_vector):
|
|
sub %rdi, %rax
|
|
bsf %rdx, %rdx
|
|
add %rdx, %rax
|
|
add $(VEC_SIZE * 4), %rax
|
|
|
|
.p2align 4
|
|
L(StartStrcpyPart):
|
|
lea (%r9, %rax), %rdi
|
|
mov %rsi, %rcx
|
|
mov %r9, %rax /* save result */
|
|
|
|
# ifdef USE_AS_STRNCAT
|
|
test %r8, %r8
|
|
jz L(ExitZero)
|
|
# define USE_AS_STRNCPY
|
|
# endif
|
|
|
|
# include "strcpy-evex.S"
|
|
#endif
|