mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
1fd8c163a8
Update ifunc-avx2.h, strchr.c, strcmp.c, strncmp.c and wcsnlen.c to select the function optimized with 256-bit EVEX instructions using YMM16-YMM31 registers to avoid RTM abort with usable AVX512VL, AVX512BW and BMI2 since VZEROUPPER isn't needed at function exit. For strcmp/strncmp, prefer AVX2 strcmp/strncmp if Prefer_AVX2_STRCMP is set.
437 lines
8.6 KiB
ArmAsm
437 lines
8.6 KiB
ArmAsm
/* strlen/strnlen/wcslen/wcsnlen optimized with 256-bit EVEX instructions.
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Copyright (C) 2021 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 STRLEN
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# define STRLEN __strlen_evex
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# endif
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# define VMOVA vmovdqa64
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# ifdef USE_AS_WCSLEN
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# define VPCMP vpcmpd
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# define VPMINU vpminud
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# define SHIFT_REG r9d
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# else
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# define VPCMP vpcmpb
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# define VPMINU vpminub
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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 YMM1 ymm17
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# define YMM2 ymm18
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# define YMM3 ymm19
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# define YMM4 ymm20
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# define YMM5 ymm21
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# define YMM6 ymm22
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# define VEC_SIZE 32
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.section .text.evex,"ax",@progbits
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ENTRY (STRLEN)
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# ifdef USE_AS_STRNLEN
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/* Check for zero length. */
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test %RSI_LP, %RSI_LP
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jz L(zero)
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# ifdef USE_AS_WCSLEN
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shl $2, %RSI_LP
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# elif defined __ILP32__
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/* Clear the upper 32 bits. */
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movl %esi, %esi
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# endif
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mov %RSI_LP, %R8_LP
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# endif
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movl %edi, %ecx
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movq %rdi, %rdx
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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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/* Check the first VEC_SIZE bytes. Each bit in K0 represents a
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null byte. */
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VPCMP $0, (%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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# ifdef USE_AS_STRNLEN
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jnz L(first_vec_x0_check)
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/* Adjust length and check the end of data. */
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subq $VEC_SIZE, %rsi
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jbe L(max)
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# else
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jnz L(first_vec_x0)
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# endif
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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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# ifdef USE_AS_STRNLEN
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/* Adjust length. */
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addq %rcx, %rsi
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subq $(VEC_SIZE * 4), %rsi
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jbe L(last_4x_vec_or_less)
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# endif
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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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# ifdef USE_AS_WCSLEN
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/* NB: Divide shift count by 4 since each bit in K0 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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VPCMP $0, (%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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/* Remove the leading bytes. */
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sarxl %SHIFT_REG, %eax, %eax
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testl %eax, %eax
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jz L(aligned_more)
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tzcntl %eax, %eax
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# ifdef USE_AS_WCSLEN
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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sall $2, %eax
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# endif
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# ifdef USE_AS_STRNLEN
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/* Check the end of data. */
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cmpq %rax, %rsi
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jbe L(max)
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# endif
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addq %rdi, %rax
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addq %rcx, %rax
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subq %rdx, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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.p2align 4
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L(aligned_more):
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# ifdef USE_AS_STRNLEN
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/* "rcx" is less than VEC_SIZE. Calculate "rdx + rcx - VEC_SIZE"
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with "rdx - (VEC_SIZE - rcx)" instead of "(rdx + rcx) - VEC_SIZE"
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to void possible addition overflow. */
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negq %rcx
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addq $VEC_SIZE, %rcx
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/* Check the end of data. */
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subq %rcx, %rsi
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jbe L(max)
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# endif
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addq $VEC_SIZE, %rdi
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# ifdef USE_AS_STRNLEN
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subq $(VEC_SIZE * 4), %rsi
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jbe L(last_4x_vec_or_less)
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# endif
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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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VPCMP $0, (%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x0)
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VPCMP $0, VEC_SIZE(%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x1)
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VPCMP $0, (VEC_SIZE * 2)(%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x2)
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VPCMP $0, (VEC_SIZE * 3)(%rdi), %YMMZERO, %k0
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kmovd %k0, %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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# ifdef USE_AS_STRNLEN
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subq $(VEC_SIZE * 4), %rsi
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jbe L(last_4x_vec_or_less)
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# endif
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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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# ifdef USE_AS_STRNLEN
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/* Adjust length. */
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addq %rcx, %rsi
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# endif
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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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VMOVA (%rdi), %YMM1
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VMOVA VEC_SIZE(%rdi), %YMM2
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VMOVA (VEC_SIZE * 2)(%rdi), %YMM3
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VMOVA (VEC_SIZE * 3)(%rdi), %YMM4
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VPMINU %YMM1, %YMM2, %YMM5
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VPMINU %YMM3, %YMM4, %YMM6
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VPMINU %YMM5, %YMM6, %YMM5
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VPCMP $0, %YMM5, %YMMZERO, %k0
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ktestd %k0, %k0
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jnz L(4x_vec_end)
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addq $(VEC_SIZE * 4), %rdi
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# ifndef USE_AS_STRNLEN
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jmp L(loop_4x_vec)
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# else
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subq $(VEC_SIZE * 4), %rsi
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ja L(loop_4x_vec)
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L(last_4x_vec_or_less):
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/* Less than 4 * VEC and aligned to VEC_SIZE. */
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addl $(VEC_SIZE * 2), %esi
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jle L(last_2x_vec)
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VPCMP $0, (%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x0)
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VPCMP $0, VEC_SIZE(%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x1)
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VPCMP $0, (VEC_SIZE * 2)(%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x2_check)
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subl $VEC_SIZE, %esi
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jle L(max)
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VPCMP $0, (VEC_SIZE * 3)(%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x3_check)
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movq %r8, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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.p2align 4
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L(last_2x_vec):
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addl $(VEC_SIZE * 2), %esi
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VPCMP $0, (%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x0_check)
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subl $VEC_SIZE, %esi
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jle L(max)
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VPCMP $0, VEC_SIZE(%rdi), %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x1_check)
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movq %r8, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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.p2align 4
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L(first_vec_x0_check):
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tzcntl %eax, %eax
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# ifdef USE_AS_WCSLEN
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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sall $2, %eax
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# endif
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/* Check the end of data. */
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cmpq %rax, %rsi
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jbe L(max)
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addq %rdi, %rax
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subq %rdx, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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.p2align 4
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L(first_vec_x1_check):
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tzcntl %eax, %eax
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# ifdef USE_AS_WCSLEN
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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sall $2, %eax
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# endif
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/* Check the end of data. */
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cmpq %rax, %rsi
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jbe L(max)
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addq $VEC_SIZE, %rax
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addq %rdi, %rax
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subq %rdx, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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.p2align 4
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L(first_vec_x2_check):
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tzcntl %eax, %eax
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# ifdef USE_AS_WCSLEN
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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sall $2, %eax
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# endif
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/* Check the end of data. */
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cmpq %rax, %rsi
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jbe L(max)
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addq $(VEC_SIZE * 2), %rax
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addq %rdi, %rax
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subq %rdx, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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.p2align 4
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L(first_vec_x3_check):
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tzcntl %eax, %eax
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# ifdef USE_AS_WCSLEN
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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sall $2, %eax
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# endif
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/* Check the end of data. */
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cmpq %rax, %rsi
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jbe L(max)
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addq $(VEC_SIZE * 3), %rax
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addq %rdi, %rax
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subq %rdx, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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.p2align 4
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L(max):
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movq %r8, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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.p2align 4
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L(zero):
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xorl %eax, %eax
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ret
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# endif
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.p2align 4
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L(first_vec_x0):
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tzcntl %eax, %eax
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# ifdef USE_AS_WCSLEN
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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sall $2, %eax
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# endif
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addq %rdi, %rax
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subq %rdx, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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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_WCSLEN
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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sall $2, %eax
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# endif
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addq $VEC_SIZE, %rax
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addq %rdi, %rax
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subq %rdx, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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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_WCSLEN
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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sall $2, %eax
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# endif
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addq $(VEC_SIZE * 2), %rax
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addq %rdi, %rax
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subq %rdx, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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.p2align 4
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L(4x_vec_end):
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VPCMP $0, %YMM1, %YMMZERO, %k0
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kmovd %k0, %eax
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testl %eax, %eax
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jnz L(first_vec_x0)
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VPCMP $0, %YMM2, %YMMZERO, %k1
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kmovd %k1, %eax
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testl %eax, %eax
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jnz L(first_vec_x1)
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VPCMP $0, %YMM3, %YMMZERO, %k2
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kmovd %k2, %eax
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testl %eax, %eax
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jnz L(first_vec_x2)
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VPCMP $0, %YMM4, %YMMZERO, %k3
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kmovd %k3, %eax
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L(first_vec_x3):
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tzcntl %eax, %eax
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# ifdef USE_AS_WCSLEN
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/* NB: Multiply wchar_t count by 4 to get the number of bytes. */
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sall $2, %eax
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# endif
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addq $(VEC_SIZE * 3), %rax
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addq %rdi, %rax
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subq %rdx, %rax
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# ifdef USE_AS_WCSLEN
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shrq $2, %rax
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# endif
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ret
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END (STRLEN)
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#endif
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