x86-64: Optimize strlen/strnlen/wcslen/wcsnlen with AVX2
Optimize strlen/strnlen/wcslen/wcsnlen with AVX2 to check 32 bytes with a single vector compare instruction. It is as fast as SSE2 versions for size <= 16 bytes and up to 1X faster for or size > 16 bytes on Haswell. Select AVX2 version on AVX2 machines where vzeroupper is preferred and AVX unaligned load is fast. NB: It uses TZCNT instead of BSF since TZCNT produces the same result as BSF for non-zero input. TZCNT is faster than BSF and is executed as BSF if machine doesn't support TZCNT. * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add strlen-sse2, strnlen-sse2, strlen-avx2, strnlen-avx2, wcslen-sse2, wcslen-avx2 and wcsnlen-avx2. * sysdeps/x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add tests for __strlen_avx2, __strlen_sse2, __strnlen_avx2, __strnlen_sse2, __wcslen_avx2, __wcslen_sse2 and __wcsnlen_avx2. * sysdeps/x86_64/multiarch/strlen-avx2.S: New file. * sysdeps/x86_64/multiarch/strlen-sse2.S: Likewise. * sysdeps/x86_64/multiarch/strlen.c: Likewise. * sysdeps/x86_64/multiarch/strnlen-avx2.S: Likewise. * sysdeps/x86_64/multiarch/strnlen-sse2.S: Likewise. * sysdeps/x86_64/multiarch/strnlen.c: Likewise. * sysdeps/x86_64/multiarch/wcslen-avx2.S: Likewise. * sysdeps/x86_64/multiarch/wcslen-sse2.S: Likewise. * sysdeps/x86_64/multiarch/wcslen.c: Likewise. * sysdeps/x86_64/multiarch/wcsnlen-avx2.S: Likewise. * sysdeps/x86_64/multiarch/wcsnlen.c (OPTIMIZE (avx2)): New. (IFUNC_SELECTOR): Return OPTIMIZE (avx2) on AVX2 machines where vzeroupper is preferred and AVX unaligned load is fast.
This commit is contained in:
H.J. Lu
parent
2f5d20ac99
commit
dc485ceb2a
23
ChangeLog
23
ChangeLog
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@ -1,3 +1,26 @@
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2017-06-09 H.J. Lu <hongjiu.lu@intel.com>
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* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
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strlen-sse2, strnlen-sse2, strlen-avx2, strnlen-avx2,
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wcslen-sse2, wcslen-avx2 and wcsnlen-avx2.
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* sysdeps/x86_64/multiarch/ifunc-impl-list.c
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(__libc_ifunc_impl_list): Add tests for __strlen_avx2,
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__strlen_sse2, __strnlen_avx2, __strnlen_sse2, __wcslen_avx2,
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__wcslen_sse2 and __wcsnlen_avx2.
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* sysdeps/x86_64/multiarch/strlen-avx2.S: New file.
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* sysdeps/x86_64/multiarch/strlen-sse2.S: Likewise.
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* sysdeps/x86_64/multiarch/strlen.c: Likewise.
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* sysdeps/x86_64/multiarch/strnlen-avx2.S: Likewise.
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* sysdeps/x86_64/multiarch/strnlen-sse2.S: Likewise.
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* sysdeps/x86_64/multiarch/strnlen.c: Likewise.
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* sysdeps/x86_64/multiarch/wcslen-avx2.S: Likewise.
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* sysdeps/x86_64/multiarch/wcslen-sse2.S: Likewise.
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* sysdeps/x86_64/multiarch/wcslen.c: Likewise.
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* sysdeps/x86_64/multiarch/wcsnlen-avx2.S: Likewise.
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* sysdeps/x86_64/multiarch/wcsnlen.c (OPTIMIZE (avx2)): New.
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(IFUNC_SELECTOR): Return OPTIMIZE (avx2) on AVX2 machines where
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vzeroupper is preferred and AVX unaligned load is fast.
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2017-06-09 H.J. Lu <hongjiu.lu@intel.com>
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* sysdeps/x86_64/memchr.S (MEMCHR): New. Depending on if
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@ -13,6 +13,7 @@ sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \
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memcpy-ssse3-back \
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memmove-ssse3-back \
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memmove-avx512-no-vzeroupper strcasecmp_l-ssse3 \
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strlen-sse2 strnlen-sse2 strlen-avx2 strnlen-avx2 \
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strncase_l-ssse3 strcat-ssse3 strncat-ssse3\
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strcpy-ssse3 strncpy-ssse3 stpcpy-ssse3 stpncpy-ssse3 \
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strcpy-sse2-unaligned strncpy-sse2-unaligned \
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@ -36,7 +37,8 @@ sysdep_routines += wmemcmp-sse4 wmemcmp-ssse3 wmemcmp-c \
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wmemcmp-avx2-movbe \
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wmemchr-sse2 wmemchr-avx2 \
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wcscpy-ssse3 wcscpy-c \
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wcsnlen-sse4_1 wcsnlen-c
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wcsnlen-sse4_1 wcsnlen-c \
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wcslen-sse2 wcslen-avx2 wcsnlen-avx2
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endif
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ifeq ($(subdir),debug)
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@ -166,6 +166,20 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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__rawmemchr_avx2)
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IFUNC_IMPL_ADD (array, i, rawmemchr, 1, __rawmemchr_sse2))
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/* Support sysdeps/x86_64/multiarch/strlen.S. */
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IFUNC_IMPL (i, name, strlen,
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IFUNC_IMPL_ADD (array, i, strlen,
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HAS_ARCH_FEATURE (AVX2_Usable),
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__strlen_avx2)
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IFUNC_IMPL_ADD (array, i, strlen, 1, __strlen_sse2))
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/* Support sysdeps/x86_64/multiarch/strnlen.S. */
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IFUNC_IMPL (i, name, strnlen,
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IFUNC_IMPL_ADD (array, i, strnlen,
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HAS_ARCH_FEATURE (AVX2_Usable),
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__strnlen_avx2)
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IFUNC_IMPL_ADD (array, i, strnlen, 1, __strnlen_sse2))
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/* Support sysdeps/x86_64/multiarch/stpncpy.S. */
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IFUNC_IMPL (i, name, stpncpy,
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IFUNC_IMPL_ADD (array, i, stpncpy, HAS_CPU_FEATURE (SSSE3),
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@ -310,8 +324,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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__wcscpy_ssse3)
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IFUNC_IMPL_ADD (array, i, wcscpy, 1, __wcscpy_sse2))
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/* Support sysdeps/x86_64/multiarch/wcslen.c. */
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IFUNC_IMPL (i, name, wcslen,
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IFUNC_IMPL_ADD (array, i, wcslen,
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HAS_ARCH_FEATURE (AVX2_Usable),
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__wcslen_avx2)
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IFUNC_IMPL_ADD (array, i, wcslen, 1, __wcslen_sse2))
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/* Support sysdeps/x86_64/multiarch/wcsnlen.c. */
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IFUNC_IMPL (i, name, wcsnlen,
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IFUNC_IMPL_ADD (array, i, wcsnlen,
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HAS_ARCH_FEATURE (AVX2_Usable),
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__wcsnlen_avx2)
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IFUNC_IMPL_ADD (array, i, wcsnlen,
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HAS_CPU_FEATURE (SSE4_1),
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__wcsnlen_sse4_1)
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@ -0,0 +1,394 @@
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/* strlen/strnlen/wcslen/wcsnlen optimized with AVX2.
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Copyright (C) 2017 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 STRLEN
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# define STRLEN __strlen_avx2
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# endif
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# ifdef USE_AS_WCSLEN
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# define VPCMPEQ vpcmpeqd
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# define VPMINU vpminud
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# else
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# define VPCMPEQ vpcmpeqb
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# define VPMINU vpminub
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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 (STRLEN)
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# ifdef USE_AS_STRNLEN
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/* Check for zero length. */
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testq %rsi, %rsi
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jz L(zero)
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# ifdef USE_AS_WCSLEN
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shl $2, %rsi
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# endif
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movq %rsi, %r8
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# endif
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movl %edi, %ecx
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movq %rdi, %rdx
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vpxor %xmm0, %xmm0, %xmm0
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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. */
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VPCMPEQ (%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %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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VPCMPEQ (%rdi), %ymm0, %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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tzcntl %eax, %eax
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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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VZEROUPPER
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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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VPCMPEQ (%rdi), %ymm0, %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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VPCMPEQ VEC_SIZE(%rdi), %ymm0, %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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VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm0, %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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VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm0, %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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# 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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vmovdqa (%rdi), %ymm1
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vmovdqa VEC_SIZE(%rdi), %ymm2
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vmovdqa (VEC_SIZE * 2)(%rdi), %ymm3
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vmovdqa (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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VPCMPEQ %ymm5, %ymm0, %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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# 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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VPCMPEQ (%rdi), %ymm0, %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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VPCMPEQ VEC_SIZE(%rdi), %ymm0, %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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VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %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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VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %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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VZEROUPPER
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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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VPCMPEQ (%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %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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VPCMPEQ VEC_SIZE(%rdi), %ymm0, %ymm1
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vpmovmskb %ymm1, %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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VZEROUPPER
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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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/* 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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VZEROUPPER
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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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/* 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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VZEROUPPER
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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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/* 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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VZEROUPPER
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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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/* Check the end of data. */
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cmpq %rax, %rsi
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||||
jbe L(max)
|
||||
addq $(VEC_SIZE * 3), %rax
|
||||
addq %rdi, %rax
|
||||
subq %rdx, %rax
|
||||
# ifdef USE_AS_WCSLEN
|
||||
shrq $2, %rax
|
||||
# endif
|
||||
VZEROUPPER
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(max):
|
||||
movq %r8, %rax
|
||||
# ifdef USE_AS_WCSLEN
|
||||
shrq $2, %rax
|
||||
# endif
|
||||
VZEROUPPER
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(zero):
|
||||
xorl %eax, %eax
|
||||
ret
|
||||
# endif
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x0):
|
||||
tzcntl %eax, %eax
|
||||
addq %rdi, %rax
|
||||
subq %rdx, %rax
|
||||
# ifdef USE_AS_WCSLEN
|
||||
shrq $2, %rax
|
||||
# endif
|
||||
VZEROUPPER
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x1):
|
||||
tzcntl %eax, %eax
|
||||
addq $VEC_SIZE, %rax
|
||||
addq %rdi, %rax
|
||||
subq %rdx, %rax
|
||||
# ifdef USE_AS_WCSLEN
|
||||
shrq $2, %rax
|
||||
# endif
|
||||
VZEROUPPER
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(first_vec_x2):
|
||||
tzcntl %eax, %eax
|
||||
addq $(VEC_SIZE * 2), %rax
|
||||
addq %rdi, %rax
|
||||
subq %rdx, %rax
|
||||
# ifdef USE_AS_WCSLEN
|
||||
shrq $2, %rax
|
||||
# endif
|
||||
VZEROUPPER
|
||||
ret
|
||||
|
||||
.p2align 4
|
||||
L(4x_vec_end):
|
||||
VPCMPEQ %ymm1, %ymm0, %ymm1
|
||||
vpmovmskb %ymm1, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x0)
|
||||
VPCMPEQ %ymm2, %ymm0, %ymm2
|
||||
vpmovmskb %ymm2, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x1)
|
||||
VPCMPEQ %ymm3, %ymm0, %ymm3
|
||||
vpmovmskb %ymm3, %eax
|
||||
testl %eax, %eax
|
||||
jnz L(first_vec_x2)
|
||||
VPCMPEQ %ymm4, %ymm0, %ymm4
|
||||
vpmovmskb %ymm4, %eax
|
||||
testl %eax, %eax
|
||||
L(first_vec_x3):
|
||||
tzcntl %eax, %eax
|
||||
addq $(VEC_SIZE * 3), %rax
|
||||
addq %rdi, %rax
|
||||
subq %rdx, %rax
|
||||
# ifdef USE_AS_WCSLEN
|
||||
shrq $2, %rax
|
||||
# endif
|
||||
VZEROUPPER
|
||||
ret
|
||||
|
||||
END (STRLEN)
|
||||
#endif
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
/* strlen optimized with SSE2.
|
||||
Copyright (C) 2017 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#if IS_IN (libc)
|
||||
# define strlen __strlen_sse2
|
||||
#endif
|
||||
|
||||
#include "../strlen.S"
|
||||
|
|
@ -0,0 +1,34 @@
|
|||
/* Multiple versions of strlen.
|
||||
All versions must be listed in ifunc-impl-list.c.
|
||||
Copyright (C) 2017 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
/* Define multiple versions only for the definition in libc. */
|
||||
#if IS_IN (libc)
|
||||
# define strlen __redirect_strlen
|
||||
# include <string.h>
|
||||
# undef strlen
|
||||
|
||||
# define SYMBOL_NAME strlen
|
||||
# include "ifunc-avx2.h"
|
||||
|
||||
libc_ifunc_redirected (__redirect_strlen, strlen, IFUNC_SELECTOR ());
|
||||
# ifdef SHARED
|
||||
__hidden_ver1 (strlen, __GI_strlen, __redirect_strlen)
|
||||
__attribute__((visibility ("hidden")));
|
||||
# endif
|
||||
#endif
|
||||
|
|
@ -0,0 +1,4 @@
|
|||
#define STRLEN __strnlen_avx2
|
||||
#define USE_AS_STRNLEN 1
|
||||
|
||||
#include "strlen-avx2.S"
|
||||
|
|
@ -0,0 +1,28 @@
|
|||
/* strnlen optimized with SSE2.
|
||||
Copyright (C) 2017 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#if IS_IN (libc)
|
||||
# define __strnlen __strnlen_sse2
|
||||
|
||||
# undef weak_alias
|
||||
# define weak_alias(__strnlen, strnlen)
|
||||
# undef libc_hidden_builtin_def
|
||||
# define libc_hidden_builtin_def(strnlen)
|
||||
#endif
|
||||
|
||||
#include "../strnlen.S"
|
||||
|
|
@ -0,0 +1,39 @@
|
|||
/* Multiple versions of strnlen.
|
||||
All versions must be listed in ifunc-impl-list.c.
|
||||
Copyright (C) 2017 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
/* Define multiple versions only for the definition in libc. */
|
||||
#if IS_IN (libc)
|
||||
# define strnlen __redirect_strnlen
|
||||
# define __strnlen __redirect___strnlen
|
||||
# include <string.h>
|
||||
# undef __strnlen
|
||||
# undef strnlen
|
||||
|
||||
# define SYMBOL_NAME strnlen
|
||||
# include "ifunc-avx2.h"
|
||||
|
||||
libc_ifunc_redirected (__redirect_strnlen, __strnlen, IFUNC_SELECTOR ());
|
||||
weak_alias (__strnlen, strnlen);
|
||||
# ifdef SHARED
|
||||
__hidden_ver1 (__strnlen, __GI___strnlen, __redirect___strnlen)
|
||||
__attribute__((visibility ("hidden")));
|
||||
__hidden_ver1 (strnlen, __GI_strnlen, __redirect_strnlen)
|
||||
__attribute__((weak, visibility ("hidden")));
|
||||
# endif
|
||||
#endif
|
||||
|
|
@ -0,0 +1,4 @@
|
|||
#define STRLEN __wcslen_avx2
|
||||
#define USE_AS_WCSLEN 1
|
||||
|
||||
#include "strlen-avx2.S"
|
||||
|
|
@ -0,0 +1,26 @@
|
|||
/* wcslen optimized with SSE2.
|
||||
Copyright (C) 2017 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#if IS_IN (libc)
|
||||
# define __wcslen __wcslen_sse2
|
||||
|
||||
# undef weak_alias
|
||||
# define weak_alias(__wcslen, wcslen)
|
||||
#endif
|
||||
|
||||
#include "../wcslen.S"
|
||||
|
|
@ -0,0 +1,31 @@
|
|||
/* Multiple versions of wcslen.
|
||||
All versions must be listed in ifunc-impl-list.c.
|
||||
Copyright (C) 2017 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
/* Define multiple versions only for the definition in libc. */
|
||||
#if IS_IN (libc)
|
||||
# define __wcslen __redirect_wcslen
|
||||
# include <wchar.h>
|
||||
# undef __wcslen
|
||||
|
||||
# define SYMBOL_NAME wcslen
|
||||
# include "ifunc-avx2.h"
|
||||
|
||||
libc_ifunc_redirected (__redirect_wcslen, __wcslen, IFUNC_SELECTOR ());
|
||||
weak_alias (__wcslen, wcslen);
|
||||
#endif
|
||||
|
|
@ -0,0 +1,5 @@
|
|||
#define STRLEN __wcsnlen_avx2
|
||||
#define USE_AS_WCSLEN 1
|
||||
#define USE_AS_STRNLEN 1
|
||||
|
||||
#include "strlen-avx2.S"
|
||||
|
|
@ -28,12 +28,18 @@
|
|||
|
||||
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
|
||||
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse4_1) attribute_hidden;
|
||||
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
|
||||
|
||||
static inline void *
|
||||
IFUNC_SELECTOR (void)
|
||||
{
|
||||
const struct cpu_features* cpu_features = __get_cpu_features ();
|
||||
|
||||
if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER)
|
||||
&& CPU_FEATURES_ARCH_P (cpu_features, AVX2_Usable)
|
||||
&& CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
|
||||
return OPTIMIZE (avx2);
|
||||
|
||||
if (CPU_FEATURES_CPU_P (cpu_features, SSE4_1))
|
||||
return OPTIMIZE (sse4_1);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue