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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.
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Copyright (C) 2021-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <isa-level.h>
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#if ISA_SHOULD_BUILD (4)
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# include <sysdep.h>
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# ifndef STRCAT
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# define STRCAT __strcat_evex
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# endif
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# define VMOVU vmovdqu64
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# define VMOVA vmovdqa64
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/* zero register */
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# define XMMZERO xmm16
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# define YMMZERO ymm16
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# define YMM0 ymm17
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# define YMM1 ymm18
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# define USE_AS_STRCAT
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/* Number of bytes in a vector register */
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# define VEC_SIZE 32
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.section .text.evex,"ax",@progbits
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ENTRY (STRCAT)
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mov %rdi, %r9
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# ifdef USE_AS_STRNCAT
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mov %rdx, %r8
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# endif
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xor %eax, %eax
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mov %edi, %ecx
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and $((VEC_SIZE * 4) - 1), %ecx
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vpxorq %XMMZERO, %XMMZERO, %XMMZERO
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cmp $(VEC_SIZE * 3), %ecx
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ja L(fourth_vector_boundary)
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vpcmpb $0, (%rdi), %YMMZERO, %k0
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kmovd %k0, %edx
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test %edx, %edx
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jnz L(exit_null_on_first_vector)
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mov %rdi, %rax
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and $-VEC_SIZE, %rax
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jmp L(align_vec_size_start)
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L(fourth_vector_boundary):
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mov %rdi, %rax
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and $-VEC_SIZE, %rax
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vpcmpb $0, (%rax), %YMMZERO, %k0
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mov $-1, %r10d
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sub %rax, %rcx
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shl %cl, %r10d
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kmovd %k0, %edx
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and %r10d, %edx
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jnz L(exit)
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L(align_vec_size_start):
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vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k0
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kmovd %k0, %edx
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
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kmovd %k1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
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kmovd %k2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
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kmovd %k3, %edx
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test %edx, %edx
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jnz L(exit_null_on_fifth_vector)
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vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
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add $(VEC_SIZE * 4), %rax
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kmovd %k4, %edx
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
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kmovd %k1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
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kmovd %k2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
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kmovd %k3, %edx
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test %edx, %edx
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jnz L(exit_null_on_fifth_vector)
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vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
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kmovd %k4, %edx
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add $(VEC_SIZE * 4), %rax
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
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kmovd %k1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
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kmovd %k2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
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kmovd %k3, %edx
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test %edx, %edx
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jnz L(exit_null_on_fifth_vector)
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vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
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add $(VEC_SIZE * 4), %rax
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kmovd %k4, %edx
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
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kmovd %k1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
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kmovd %k2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
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kmovd %k3, %edx
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test %edx, %edx
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jnz L(exit_null_on_fifth_vector)
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test $((VEC_SIZE * 4) - 1), %rax
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jz L(align_four_vec_loop)
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vpcmpb $0, (VEC_SIZE * 5)(%rax), %YMMZERO, %k4
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add $(VEC_SIZE * 5), %rax
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kmovd %k4, %edx
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test %edx, %edx
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jnz L(exit)
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test $((VEC_SIZE * 4) - 1), %rax
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jz L(align_four_vec_loop)
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vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k0
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add $VEC_SIZE, %rax
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kmovd %k0, %edx
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test %edx, %edx
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jnz L(exit)
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test $((VEC_SIZE * 4) - 1), %rax
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jz L(align_four_vec_loop)
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vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k0
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add $VEC_SIZE, %rax
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kmovd %k0, %edx
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test %edx, %edx
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jnz L(exit)
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test $((VEC_SIZE * 4) - 1), %rax
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jz L(align_four_vec_loop)
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vpcmpb $0, VEC_SIZE(%rax), %YMMZERO, %k1
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add $VEC_SIZE, %rax
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kmovd %k1, %edx
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test %edx, %edx
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jnz L(exit)
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add $VEC_SIZE, %rax
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.p2align 4
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L(align_four_vec_loop):
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VMOVA (%rax), %YMM0
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VMOVA (VEC_SIZE * 2)(%rax), %YMM1
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vpminub VEC_SIZE(%rax), %YMM0, %YMM0
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vpminub (VEC_SIZE * 3)(%rax), %YMM1, %YMM1
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vpminub %YMM0, %YMM1, %YMM0
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/* If K0 != 0, there is a null byte. */
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vpcmpb $0, %YMM0, %YMMZERO, %k0
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add $(VEC_SIZE * 4), %rax
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ktestd %k0, %k0
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jz L(align_four_vec_loop)
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vpcmpb $0, -(VEC_SIZE * 4)(%rax), %YMMZERO, %k0
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sub $(VEC_SIZE * 5), %rax
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kmovd %k0, %edx
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test %edx, %edx
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jnz L(exit_null_on_second_vector)
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vpcmpb $0, (VEC_SIZE * 2)(%rax), %YMMZERO, %k1
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kmovd %k1, %edx
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test %edx, %edx
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jnz L(exit_null_on_third_vector)
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vpcmpb $0, (VEC_SIZE * 3)(%rax), %YMMZERO, %k2
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kmovd %k2, %edx
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test %edx, %edx
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jnz L(exit_null_on_fourth_vector)
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vpcmpb $0, (VEC_SIZE * 4)(%rax), %YMMZERO, %k3
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kmovd %k3, %edx
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $(VEC_SIZE * 4), %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit):
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sub %rdi, %rax
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L(exit_null_on_first_vector):
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bsf %rdx, %rdx
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add %rdx, %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit_null_on_second_vector):
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $VEC_SIZE, %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit_null_on_third_vector):
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $(VEC_SIZE * 2), %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit_null_on_fourth_vector):
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $(VEC_SIZE * 3), %rax
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jmp L(StartStrcpyPart)
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.p2align 4
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L(exit_null_on_fifth_vector):
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sub %rdi, %rax
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bsf %rdx, %rdx
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add %rdx, %rax
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add $(VEC_SIZE * 4), %rax
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.p2align 4
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L(StartStrcpyPart):
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lea (%r9, %rax), %rdi
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mov %rsi, %rcx
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mov %r9, %rax /* save result */
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# ifdef USE_AS_STRNCAT
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test %r8, %r8
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jz L(ExitZero)
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# define USE_AS_STRNCPY
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# endif
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# include "strcpy-evex.S"
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#endif
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