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255 lines
5.4 KiB
ArmAsm
255 lines
5.4 KiB
ArmAsm
/* strchr/strchrnul 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 STRCHR
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# define STRCHR __strchr_avx2
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# endif
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# ifdef USE_AS_WCSCHR
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# define VPBROADCAST vpbroadcastd
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# define VPCMPEQ vpcmpeqd
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# define CHAR_REG esi
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# else
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# define VPBROADCAST vpbroadcastb
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# define VPCMPEQ vpcmpeqb
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# define CHAR_REG sil
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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 (STRCHR)
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movl %edi, %ecx
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/* Broadcast CHAR to YMM0. */
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vmovd %esi, %xmm0
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vpxor %xmm9, %xmm9, %xmm9
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VPBROADCAST %xmm0, %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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/* Check the first VEC_SIZE bytes. Search for both CHAR and the
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null byte. */
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vmovdqu (%rdi), %ymm8
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VPCMPEQ %ymm8, %ymm0, %ymm1
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VPCMPEQ %ymm8, %ymm9, %ymm2
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vpor %ymm1, %ymm2, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x0)
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/* Align data for aligned loads in the loop. */
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addq $VEC_SIZE, %rdi
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andl $(VEC_SIZE - 1), %ecx
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andq $-VEC_SIZE, %rdi
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jmp L(more_4x_vec)
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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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vmovdqu (%rdi), %ymm8
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VPCMPEQ %ymm8, %ymm0, %ymm1
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VPCMPEQ %ymm8, %ymm9, %ymm2
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vpor %ymm1, %ymm2, %ymm1
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vpmovmskb %ymm1, %eax
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/* Remove the leading bytes. */
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sarl %cl, %eax
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testl %eax, %eax
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jz L(aligned_more)
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/* Found CHAR or the null byte. */
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tzcntl %eax, %eax
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addq %rcx, %rax
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# ifdef USE_AS_STRCHRNUL
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addq %rdi, %rax
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# else
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xorl %edx, %edx
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leaq (%rdi, %rax), %rax
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cmp (%rax), %CHAR_REG
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cmovne %rdx, %rax
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# endif
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VZEROUPPER
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ret
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.p2align 4
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L(aligned_more):
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addq $VEC_SIZE, %rdi
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L(more_4x_vec):
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/* Check the first 4 * VEC_SIZE. Only one VEC_SIZE at a time
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since data is only aligned to VEC_SIZE. */
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vmovdqa (%rdi), %ymm8
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VPCMPEQ %ymm8, %ymm0, %ymm1
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VPCMPEQ %ymm8, %ymm9, %ymm2
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vpor %ymm1, %ymm2, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x0)
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vmovdqa VEC_SIZE(%rdi), %ymm8
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VPCMPEQ %ymm8, %ymm0, %ymm1
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VPCMPEQ %ymm8, %ymm9, %ymm2
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vpor %ymm1, %ymm2, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x1)
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vmovdqa (VEC_SIZE * 2)(%rdi), %ymm8
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VPCMPEQ %ymm8, %ymm0, %ymm1
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VPCMPEQ %ymm8, %ymm9, %ymm2
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vpor %ymm1, %ymm2, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x2)
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vmovdqa (VEC_SIZE * 3)(%rdi), %ymm8
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VPCMPEQ %ymm8, %ymm0, %ymm1
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VPCMPEQ %ymm8, %ymm9, %ymm2
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vpor %ymm1, %ymm2, %ymm1
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x3)
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addq $(VEC_SIZE * 4), %rdi
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/* Align data to 4 * VEC_SIZE. */
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movq %rdi, %rcx
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andl $(4 * VEC_SIZE - 1), %ecx
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andq $-(4 * VEC_SIZE), %rdi
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.p2align 4
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L(loop_4x_vec):
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/* Compare 4 * VEC at a time forward. */
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vmovdqa (%rdi), %ymm5
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vmovdqa VEC_SIZE(%rdi), %ymm6
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vmovdqa (VEC_SIZE * 2)(%rdi), %ymm7
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vmovdqa (VEC_SIZE * 3)(%rdi), %ymm8
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VPCMPEQ %ymm5, %ymm0, %ymm1
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VPCMPEQ %ymm6, %ymm0, %ymm2
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VPCMPEQ %ymm7, %ymm0, %ymm3
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VPCMPEQ %ymm8, %ymm0, %ymm4
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VPCMPEQ %ymm5, %ymm9, %ymm5
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VPCMPEQ %ymm6, %ymm9, %ymm6
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VPCMPEQ %ymm7, %ymm9, %ymm7
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VPCMPEQ %ymm8, %ymm9, %ymm8
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vpor %ymm1, %ymm5, %ymm1
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vpor %ymm2, %ymm6, %ymm2
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vpor %ymm3, %ymm7, %ymm3
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vpor %ymm4, %ymm8, %ymm4
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vpor %ymm1, %ymm2, %ymm5
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vpor %ymm3, %ymm4, %ymm6
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vpor %ymm5, %ymm6, %ymm5
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vpmovmskb %ymm5, %eax
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testl %eax, %eax
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jnz L(4x_vec_end)
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addq $(VEC_SIZE * 4), %rdi
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jmp L(loop_4x_vec)
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.p2align 4
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L(first_vec_x0):
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/* Found CHAR or the null byte. */
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tzcntl %eax, %eax
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# ifdef USE_AS_STRCHRNUL
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addq %rdi, %rax
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# else
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xorl %edx, %edx
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leaq (%rdi, %rax), %rax
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cmp (%rax), %CHAR_REG
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cmovne %rdx, %rax
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# endif
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VZEROUPPER
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ret
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.p2align 4
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L(first_vec_x1):
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tzcntl %eax, %eax
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# ifdef USE_AS_STRCHRNUL
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addq $VEC_SIZE, %rax
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addq %rdi, %rax
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# else
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xorl %edx, %edx
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leaq VEC_SIZE(%rdi, %rax), %rax
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cmp (%rax), %CHAR_REG
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cmovne %rdx, %rax
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# endif
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VZEROUPPER
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ret
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.p2align 4
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L(first_vec_x2):
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tzcntl %eax, %eax
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# ifdef USE_AS_STRCHRNUL
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addq $(VEC_SIZE * 2), %rax
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addq %rdi, %rax
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# else
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xorl %edx, %edx
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leaq (VEC_SIZE * 2)(%rdi, %rax), %rax
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cmp (%rax), %CHAR_REG
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cmovne %rdx, %rax
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# endif
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VZEROUPPER
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ret
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.p2align 4
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L(4x_vec_end):
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vpmovmskb %ymm1, %eax
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testl %eax, %eax
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jnz L(first_vec_x0)
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vpmovmskb %ymm2, %eax
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testl %eax, %eax
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jnz L(first_vec_x1)
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vpmovmskb %ymm3, %eax
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testl %eax, %eax
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jnz L(first_vec_x2)
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vpmovmskb %ymm4, %eax
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testl %eax, %eax
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L(first_vec_x3):
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tzcntl %eax, %eax
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# ifdef USE_AS_STRCHRNUL
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addq $(VEC_SIZE * 3), %rax
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addq %rdi, %rax
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# else
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xorl %edx, %edx
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leaq (VEC_SIZE * 3)(%rdi, %rax), %rax
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cmp (%rax), %CHAR_REG
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cmovne %rdx, %rax
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# endif
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VZEROUPPER
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ret
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END (STRCHR)
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#endif
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