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581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
266 lines
5.8 KiB
ArmAsm
266 lines
5.8 KiB
ArmAsm
/* strrchr/wcsrchr optimized 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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#if IS_IN (libc)
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# include <sysdep.h>
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# ifndef STRRCHR
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# define STRRCHR __strrchr_evex
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# endif
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# define VMOVU vmovdqu64
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# define VMOVA vmovdqa64
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# ifdef USE_AS_WCSRCHR
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# define VPBROADCAST vpbroadcastd
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# define VPCMP vpcmpd
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# define SHIFT_REG r8d
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# else
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# define VPBROADCAST vpbroadcastb
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# define VPCMP vpcmpb
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# define SHIFT_REG ecx
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# endif
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# define XMMZERO xmm16
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# define YMMZERO ymm16
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# define YMMMATCH ymm17
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# define YMM1 ymm18
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# define VEC_SIZE 32
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.section .text.evex,"ax",@progbits
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ENTRY (STRRCHR)
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movl %edi, %ecx
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/* Broadcast CHAR to YMMMATCH. */
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VPBROADCAST %esi, %YMMMATCH
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vpxorq %XMMZERO, %XMMZERO, %XMMZERO
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/* Check if we may cross page boundary with one vector load. */
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andl $(2 * VEC_SIZE - 1), %ecx
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cmpl $VEC_SIZE, %ecx
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ja L(cros_page_boundary)
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VMOVU (%rdi), %YMM1
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/* Each bit in K0 represents a null byte in YMM1. */
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VPCMP $0, %YMMZERO, %YMM1, %k0
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/* Each bit in K1 represents a CHAR in YMM1. */
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VPCMP $0, %YMMMATCH, %YMM1, %k1
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kmovd %k0, %ecx
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kmovd %k1, %eax
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addq $VEC_SIZE, %rdi
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testl %eax, %eax
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jnz L(first_vec)
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testl %ecx, %ecx
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jnz L(return_null)
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andq $-VEC_SIZE, %rdi
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xorl %edx, %edx
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jmp L(aligned_loop)
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.p2align 4
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L(first_vec):
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/* Check if there is a null byte. */
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testl %ecx, %ecx
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jnz L(char_and_nul_in_first_vec)
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/* Remember the match and keep searching. */
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movl %eax, %edx
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movq %rdi, %rsi
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andq $-VEC_SIZE, %rdi
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jmp L(aligned_loop)
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.p2align 4
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L(cros_page_boundary):
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andl $(VEC_SIZE - 1), %ecx
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andq $-VEC_SIZE, %rdi
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# ifdef USE_AS_WCSRCHR
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/* NB: Divide shift count by 4 since each bit in K1 represent 4
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bytes. */
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movl %ecx, %SHIFT_REG
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sarl $2, %SHIFT_REG
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# endif
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VMOVA (%rdi), %YMM1
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/* Each bit in K0 represents a null byte in YMM1. */
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VPCMP $0, %YMMZERO, %YMM1, %k0
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/* Each bit in K1 represents a CHAR in YMM1. */
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VPCMP $0, %YMMMATCH, %YMM1, %k1
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kmovd %k0, %edx
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kmovd %k1, %eax
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shrxl %SHIFT_REG, %edx, %edx
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shrxl %SHIFT_REG, %eax, %eax
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addq $VEC_SIZE, %rdi
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/* Check if there is a CHAR. */
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testl %eax, %eax
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jnz L(found_char)
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testl %edx, %edx
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jnz L(return_null)
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jmp L(aligned_loop)
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.p2align 4
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L(found_char):
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testl %edx, %edx
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jnz L(char_and_nul)
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/* Remember the match and keep searching. */
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movl %eax, %edx
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leaq (%rdi, %rcx), %rsi
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.p2align 4
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L(aligned_loop):
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VMOVA (%rdi), %YMM1
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addq $VEC_SIZE, %rdi
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/* Each bit in K0 represents a null byte in YMM1. */
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VPCMP $0, %YMMZERO, %YMM1, %k0
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/* Each bit in K1 represents a CHAR in YMM1. */
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VPCMP $0, %YMMMATCH, %YMM1, %k1
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kmovd %k0, %ecx
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kmovd %k1, %eax
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orl %eax, %ecx
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jnz L(char_nor_null)
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VMOVA (%rdi), %YMM1
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add $VEC_SIZE, %rdi
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/* Each bit in K0 represents a null byte in YMM1. */
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VPCMP $0, %YMMZERO, %YMM1, %k0
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/* Each bit in K1 represents a CHAR in YMM1. */
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VPCMP $0, %YMMMATCH, %YMM1, %k1
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kmovd %k0, %ecx
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kmovd %k1, %eax
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orl %eax, %ecx
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jnz L(char_nor_null)
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VMOVA (%rdi), %YMM1
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addq $VEC_SIZE, %rdi
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/* Each bit in K0 represents a null byte in YMM1. */
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VPCMP $0, %YMMZERO, %YMM1, %k0
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/* Each bit in K1 represents a CHAR in YMM1. */
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VPCMP $0, %YMMMATCH, %YMM1, %k1
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kmovd %k0, %ecx
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kmovd %k1, %eax
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orl %eax, %ecx
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jnz L(char_nor_null)
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VMOVA (%rdi), %YMM1
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addq $VEC_SIZE, %rdi
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/* Each bit in K0 represents a null byte in YMM1. */
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VPCMP $0, %YMMZERO, %YMM1, %k0
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/* Each bit in K1 represents a CHAR in YMM1. */
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VPCMP $0, %YMMMATCH, %YMM1, %k1
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kmovd %k0, %ecx
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kmovd %k1, %eax
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orl %eax, %ecx
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jz L(aligned_loop)
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.p2align 4
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L(char_nor_null):
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/* Find a CHAR or a null byte in a loop. */
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testl %eax, %eax
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jnz L(match)
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L(return_value):
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testl %edx, %edx
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jz L(return_null)
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movl %edx, %eax
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movq %rsi, %rdi
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bsrl %eax, %eax
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# ifdef USE_AS_WCSRCHR
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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leaq -VEC_SIZE(%rdi, %rax, 4), %rax
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# else
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leaq -VEC_SIZE(%rdi, %rax), %rax
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# endif
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ret
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.p2align 4
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L(match):
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/* Find a CHAR. Check if there is a null byte. */
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kmovd %k0, %ecx
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testl %ecx, %ecx
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jnz L(find_nul)
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/* Remember the match and keep searching. */
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movl %eax, %edx
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movq %rdi, %rsi
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jmp L(aligned_loop)
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.p2align 4
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L(find_nul):
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/* Mask out any matching bits after the null byte. */
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movl %ecx, %r8d
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subl $1, %r8d
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xorl %ecx, %r8d
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andl %r8d, %eax
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testl %eax, %eax
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/* If there is no CHAR here, return the remembered one. */
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jz L(return_value)
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bsrl %eax, %eax
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# ifdef USE_AS_WCSRCHR
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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leaq -VEC_SIZE(%rdi, %rax, 4), %rax
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# else
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leaq -VEC_SIZE(%rdi, %rax), %rax
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# endif
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ret
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.p2align 4
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L(char_and_nul):
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/* Find both a CHAR and a null byte. */
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addq %rcx, %rdi
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movl %edx, %ecx
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L(char_and_nul_in_first_vec):
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/* Mask out any matching bits after the null byte. */
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movl %ecx, %r8d
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subl $1, %r8d
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xorl %ecx, %r8d
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andl %r8d, %eax
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testl %eax, %eax
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/* Return null pointer if the null byte comes first. */
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jz L(return_null)
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bsrl %eax, %eax
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# ifdef USE_AS_WCSRCHR
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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leaq -VEC_SIZE(%rdi, %rax, 4), %rax
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# else
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leaq -VEC_SIZE(%rdi, %rax), %rax
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# endif
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ret
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.p2align 4
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L(return_null):
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xorl %eax, %eax
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ret
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END (STRRCHR)
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#endif
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