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04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
236 lines
4.9 KiB
ArmAsm
236 lines
4.9 KiB
ArmAsm
/* strrchr/wcsrchr optimized with AVX2.
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Copyright (C) 2017-2019 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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<http://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_avx2
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# endif
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# ifdef USE_AS_WCSRCHR
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# define VPBROADCAST vpbroadcastd
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# define VPCMPEQ vpcmpeqd
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# else
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# define VPBROADCAST vpbroadcastb
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# define VPCMPEQ vpcmpeqb
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# endif
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# ifndef VZEROUPPER
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# define VZEROUPPER vzeroupper
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# endif
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# define VEC_SIZE 32
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.section .text.avx,"ax",@progbits
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ENTRY (STRRCHR)
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movd %esi, %xmm4
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movl %edi, %ecx
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/* Broadcast CHAR to YMM4. */
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VPBROADCAST %xmm4, %ymm4
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vpxor %ymm0, %ymm0, %ymm0
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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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vmovdqu (%rdi), %ymm1
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VPCMPEQ %ymm1, %ymm0, %ymm2
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VPCMPEQ %ymm1, %ymm4, %ymm3
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vpmovmskb %ymm2, %ecx
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vpmovmskb %ymm3, %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 nul CHAR. */
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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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vmovdqa (%rdi), %ymm1
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VPCMPEQ %ymm1, %ymm0, %ymm2
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VPCMPEQ %ymm1, %ymm4, %ymm3
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vpmovmskb %ymm2, %edx
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vpmovmskb %ymm3, %eax
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shrl %cl, %edx
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shrl %cl, %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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vmovdqa (%rdi), %ymm1
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VPCMPEQ %ymm1, %ymm0, %ymm2
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addq $VEC_SIZE, %rdi
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VPCMPEQ %ymm1, %ymm4, %ymm3
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vpmovmskb %ymm2, %ecx
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vpmovmskb %ymm3, %eax
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orl %eax, %ecx
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jnz L(char_nor_null)
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vmovdqa (%rdi), %ymm1
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VPCMPEQ %ymm1, %ymm0, %ymm2
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add $VEC_SIZE, %rdi
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VPCMPEQ %ymm1, %ymm4, %ymm3
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vpmovmskb %ymm2, %ecx
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vpmovmskb %ymm3, %eax
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orl %eax, %ecx
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jnz L(char_nor_null)
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vmovdqa (%rdi), %ymm1
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VPCMPEQ %ymm1, %ymm0, %ymm2
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addq $VEC_SIZE, %rdi
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VPCMPEQ %ymm1, %ymm4, %ymm3
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vpmovmskb %ymm2, %ecx
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vpmovmskb %ymm3, %eax
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orl %eax, %ecx
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jnz L(char_nor_null)
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vmovdqa (%rdi), %ymm1
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VPCMPEQ %ymm1, %ymm0, %ymm2
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addq $VEC_SIZE, %rdi
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VPCMPEQ %ymm1, %ymm4, %ymm3
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vpmovmskb %ymm2, %ecx
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vpmovmskb %ymm3, %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 nul CHAR 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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# ifdef USE_AS_WCSRCHR
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/* Keep the first bit for each matching CHAR for bsr. */
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andl $0x11111111, %eax
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# endif
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bsrl %eax, %eax
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leaq -VEC_SIZE(%rdi, %rax), %rax
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VZEROUPPER
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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 nul CHAR. */
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vpmovmskb %ymm2, %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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# ifdef USE_AS_WCSRCHR
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/* Keep the first bit for each matching CHAR for bsr. */
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andl $0x11111111, %ecx
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andl $0x11111111, %eax
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# endif
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/* Mask out any matching bits after the nul CHAR. */
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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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leaq -VEC_SIZE(%rdi, %rax), %rax
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VZEROUPPER
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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 nul CHAR. */
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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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# ifdef USE_AS_WCSRCHR
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/* Keep the first bit for each matching CHAR for bsr. */
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andl $0x11111111, %ecx
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andl $0x11111111, %eax
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# endif
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/* Mask out any matching bits after the nul CHAR. */
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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 nul CHAR comes first. */
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jz L(return_null)
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bsrl %eax, %eax
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leaq -VEC_SIZE(%rdi, %rax), %rax
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VZEROUPPER
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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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VZEROUPPER
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ret
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END (STRRCHR)
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#endif
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