From: "H.J. Lu" <hjl.tools@gmail.com>
To: Noah Goldstein <goldstein.w.n@gmail.com>
Cc: libc-alpha@sourceware.org, carlos@systemhalted.org
Subject: Re: [PATCH v1] x86: Add EVEX optimized memchr family not safe for RTM
Date: Thu, 6 May 2021 06:38:57 -0700 [thread overview]
Message-ID: <YJPxcZPxfFsjurvl@gmail.com> (raw)
In-Reply-To: <20210504233226.1514601-1-goldstein.w.n@gmail.com>
On Tue, May 04, 2021 at 07:32:28PM -0400, Noah Goldstein wrote:
> No bug.
>
> This commit adds a new implementation for EVEX memchr that is not safe
> for RTM because it uses vzeroupper. The benefit is that by using
> ymm0-ymm15 it can use vpcmpeq and vpternlogd in the 4x loop which is
> faster than the RTM safe version which cannot use vpcmpeq because
> there is no EVEX encoding for the instruction. All parts of the
> implementation aside from the 4x loop are the same for the two
> versions and the optimization is only relevant for large sizes.
>
> Tigerlake:
> size , algn , Pos , Cur T , New T , Win , Dif
> 512 , 6 , 192 , 9.2 , 9.04 , no-RTM , 0.16
> 512 , 7 , 224 , 9.19 , 8.98 , no-RTM , 0.21
> 2048 , 0 , 256 , 10.74 , 10.54 , no-RTM , 0.2
> 2048 , 0 , 512 , 14.81 , 14.87 , RTM , 0.06
> 2048 , 0 , 1024 , 22.97 , 22.57 , no-RTM , 0.4
> 2048 , 0 , 2048 , 37.49 , 34.51 , no-RTM , 2.98 <--
>
> Icelake:
> size , algn , Pos , Cur T , New T , Win , Dif
> 512 , 6 , 192 , 7.6 , 7.3 , no-RTM , 0.3
> 512 , 7 , 224 , 7.63 , 7.27 , no-RTM , 0.36
> 2048 , 0 , 256 , 8.48 , 8.38 , no-RTM , 0.1
> 2048 , 0 , 512 , 11.57 , 11.42 , no-RTM , 0.15
> 2048 , 0 , 1024 , 17.92 , 17.38 , no-RTM , 0.54
> 2048 , 0 , 2048 , 30.37 , 27.34 , no-RTM , 3.03 <--
>
> test-memchr, test-wmemchr, and test-rawmemchr are all passing.
>
> Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
> ---
> Two things worth noting.
>
> 1) There are few other files where this may be relevant so it may be
> better to replace ifunc-memchr.h with something more generic (mostly
> strchr, strcmp and memcmp in mind)
>
> 2) It may be better to just use the RTM safe method used in the
> avx2-rtm family for this. I don't have any machines that support intel
> TSX to test it but my fear was that the overhead on the shorter cases
> would make it not worth it (i.e for alignment = 0, sizes around [160,
> 288] or lengths around [288, 416])
>
> sysdeps/x86_64/multiarch/Makefile | 7 +-
> sysdeps/x86_64/multiarch/ifunc-impl-list.c | 18 ++
> sysdeps/x86_64/multiarch/ifunc-memchr.h | 54 ++++++
> sysdeps/x86_64/multiarch/memchr-evex-rtm.S | 8 +
> sysdeps/x86_64/multiarch/memchr-evex.S | 160 ++++++++++++++----
> sysdeps/x86_64/multiarch/memchr.c | 2 +-
> sysdeps/x86_64/multiarch/rawmemchr-evex-rtm.S | 3 +
> sysdeps/x86_64/multiarch/rawmemchr.c | 2 +-
> sysdeps/x86_64/multiarch/wmemchr-evex-rtm.S | 3 +
> sysdeps/x86_64/multiarch/wmemchr.c | 2 +-
> 10 files changed, 219 insertions(+), 40 deletions(-)
> create mode 100644 sysdeps/x86_64/multiarch/ifunc-memchr.h
> create mode 100644 sysdeps/x86_64/multiarch/memchr-evex-rtm.S
> create mode 100644 sysdeps/x86_64/multiarch/rawmemchr-evex-rtm.S
> create mode 100644 sysdeps/x86_64/multiarch/wmemchr-evex-rtm.S
>
> diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile
> index 491c7698dc..2c2aad3a7e 100644
> --- a/sysdeps/x86_64/multiarch/Makefile
> +++ b/sysdeps/x86_64/multiarch/Makefile
> @@ -77,7 +77,9 @@ sysdep_routines += strncat-c stpncpy-c strncpy-c \
> strncmp-evex \
> strncpy-evex \
> strnlen-evex \
> - strrchr-evex
> + strrchr-evex \
> + memchr-evex-rtm \
> + rawmemchr-evex-rtm
Please group EVEX files and sort them by names.
> CFLAGS-varshift.c += -msse4
> CFLAGS-strcspn-c.c += -msse4
> CFLAGS-strpbrk-c.c += -msse4
> @@ -110,7 +112,8 @@ sysdep_routines += wmemcmp-sse4 wmemcmp-ssse3 wmemcmp-c \
> wcsnlen-evex \
> wcsrchr-evex \
> wmemchr-evex \
> - wmemcmp-evex-movbe
> + wmemcmp-evex-movbe \
> + wmemchr-evex-rtm
Please group EVEX files and sort them by names.
> endif
>
> ifeq ($(subdir),debug)
> diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
> index 651b32908e..b3c4ad286d 100644
> --- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
> +++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
> @@ -52,6 +52,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
> && CPU_FEATURE_USABLE (AVX512BW)
> && CPU_FEATURE_USABLE (BMI2)),
> __memchr_evex)
> + IFUNC_IMPL_ADD (array, i, memchr,
> + (CPU_FEATURE_USABLE (AVX512VL)
> + && CPU_FEATURE_USABLE (AVX512BW)
> + && CPU_FEATURE_USABLE (BMI2)
> + && CPU_FEATURE_USABLE (RTM)),
> + __memchr_evex_rtm)
> IFUNC_IMPL_ADD (array, i, memchr, 1, __memchr_sse2))
>
> /* Support sysdeps/x86_64/multiarch/memcmp.c. */
> @@ -288,6 +294,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
> && CPU_FEATURE_USABLE (AVX512BW)
> && CPU_FEATURE_USABLE (BMI2)),
> __rawmemchr_evex)
> + IFUNC_IMPL_ADD (array, i, rawmemchr,
> + (CPU_FEATURE_USABLE (AVX512VL)
> + && CPU_FEATURE_USABLE (AVX512BW)
> + && CPU_FEATURE_USABLE (BMI2)
> + && CPU_FEATURE_USABLE (RTM)),
> + __rawmemchr_evex_rtm)
> IFUNC_IMPL_ADD (array, i, rawmemchr, 1, __rawmemchr_sse2))
>
> /* Support sysdeps/x86_64/multiarch/strlen.c. */
> @@ -708,6 +720,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
> && CPU_FEATURE_USABLE (AVX512BW)
> && CPU_FEATURE_USABLE (BMI2)),
> __wmemchr_evex)
> + IFUNC_IMPL_ADD (array, i, wmemchr,
> + (CPU_FEATURE_USABLE (AVX512VL)
> + && CPU_FEATURE_USABLE (AVX512BW)
> + && CPU_FEATURE_USABLE (BMI2)
> + && CPU_FEATURE_USABLE (RTM)),
> + __wmemchr_evex_rtm)
> IFUNC_IMPL_ADD (array, i, wmemchr, 1, __wmemchr_sse2))
>
> /* Support sysdeps/x86_64/multiarch/wmemcmp.c. */
> diff --git a/sysdeps/x86_64/multiarch/ifunc-memchr.h b/sysdeps/x86_64/multiarch/ifunc-memchr.h
> new file mode 100644
> index 0000000000..61a1f6e179
> --- /dev/null
> +++ b/sysdeps/x86_64/multiarch/ifunc-memchr.h
If the similar optimization may be applied on other functions,
please rename it to ifunc-evex.h.
> @@ -0,0 +1,54 @@
> +/* Common definition for memchr/rawmemchr/wmemchr ifunc selections.
> + All versions must be listed in ifunc-impl-list.c.
> + Copyright (C) 2017-2021 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
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <init-arch.h>
> +
> +extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2) attribute_hidden;
> +extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2) attribute_hidden;
> +extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden;
> +extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) attribute_hidden;
> +extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_rtm) attribute_hidden;
> +
> +static inline void *
> +IFUNC_SELECTOR (void)
> +{
> + const struct cpu_features* cpu_features = __get_cpu_features ();
> +
> + if (CPU_FEATURE_USABLE_P (cpu_features, AVX2)
> + && CPU_FEATURE_USABLE_P (cpu_features, BMI2)
> + && CPU_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
> + {
> + if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
> + && CPU_FEATURE_USABLE_P (cpu_features, AVX512BW))
> + {
> + if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
> + return OPTIMIZE (evex_rtm);
> +
> + return OPTIMIZE (evex);
> + }
> +
> + if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
> + return OPTIMIZE (avx2_rtm);
> +
> + if (!CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER))
> + return OPTIMIZE (avx2);
Please fix indentations for lines above.
> + }
> +
> + return OPTIMIZE (sse2);
> +}
> diff --git a/sysdeps/x86_64/multiarch/memchr-evex-rtm.S b/sysdeps/x86_64/multiarch/memchr-evex-rtm.S
> new file mode 100644
> index 0000000000..1987188271
> --- /dev/null
> +++ b/sysdeps/x86_64/multiarch/memchr-evex-rtm.S
> @@ -0,0 +1,8 @@
> +#ifndef MEMCHR
> +# define MEMCHR __memchr_evex_rtm
> +#endif
> +
> +#define USE_IN_RTM 1
> +#define SECTION(p) p##.evex.rtm
> +
> +#include "memchr-evex.S"
> diff --git a/sysdeps/x86_64/multiarch/memchr-evex.S b/sysdeps/x86_64/multiarch/memchr-evex.S
> index 81d5cd6486..c938594bc3 100644
> --- a/sysdeps/x86_64/multiarch/memchr-evex.S
> +++ b/sysdeps/x86_64/multiarch/memchr-evex.S
> @@ -38,10 +38,32 @@
> # define CHAR_SIZE 1
> # endif
>
> + /* In the 4x loop the RTM and non-RTM versions have data pointer
> + off by VEC_SIZE * 4 with RTM version being VEC_SIZE * 4 greater.
> + This is represented by BASE_OFFSET. As well because the RTM
> + version uses vpcmp which stores a bit per element compared where
> + the non-RTM version uses vpcmpeq which stores a bit per byte
> + compared RET_SCALE of CHAR_SIZE is only relevant for the RTM
> + version. */
> +# ifdef USE_IN_RTM
> +# define VZEROUPPER
> +# define BASE_OFFSET (VEC_SIZE * 4)
> +# define RET_SCALE CHAR_SIZE
> +# else
> +# define VZEROUPPER vzeroupper
> +# define BASE_OFFSET 0
> +# define RET_SCALE 1
> +# endif
> +
> + /* In the return from 4x loop memchr and rawmemchr versions have
> + data pointers off by VEC_SIZE * 4 with memchr version being
> + VEC_SIZE * 4 greater. */
> # ifdef USE_AS_RAWMEMCHR
> +# define RET_OFFSET (BASE_OFFSET - (VEC_SIZE * 4))
> # define RAW_PTR_REG rcx
> # define ALGN_PTR_REG rdi
> # else
> +# define RET_OFFSET BASE_OFFSET
> # define RAW_PTR_REG rdi
> # define ALGN_PTR_REG rcx
> # endif
> @@ -57,11 +79,15 @@
> # define YMM5 ymm21
> # define YMM6 ymm22
>
> +# ifndef SECTION
> +# define SECTION(p) p##.evex
> +# endif
> +
> # define VEC_SIZE 32
> # define CHAR_PER_VEC (VEC_SIZE / CHAR_SIZE)
> # define PAGE_SIZE 4096
>
> - .section .text.evex,"ax",@progbits
> + .section SECTION(.text),"ax",@progbits
> ENTRY (MEMCHR)
> # ifndef USE_AS_RAWMEMCHR
> /* Check for zero length. */
> @@ -237,14 +263,15 @@ L(cross_page_continue):
> /* Check if at last CHAR_PER_VEC * 4 length. */
> subq $(CHAR_PER_VEC * 4), %rdx
> jbe L(last_4x_vec_or_less_cmpeq)
> - addq $VEC_SIZE, %rdi
> + /* +VEC_SIZE if USE_IN_RTM otherwise +VEC_SIZE * 5. */
> + addq $(VEC_SIZE + (VEC_SIZE * 4 - BASE_OFFSET)), %rdi
>
> /* Align data to VEC_SIZE * 4 for the loop and readjust length.
> */
> # ifdef USE_AS_WMEMCHR
> movl %edi, %ecx
> andq $-(4 * VEC_SIZE), %rdi
> - andl $(VEC_SIZE * 4 - 1), %ecx
> + subl %edi, %ecx
> /* NB: Divide bytes by 4 to get the wchar_t count. */
> sarl $2, %ecx
> addq %rcx, %rdx
> @@ -254,15 +281,28 @@ L(cross_page_continue):
> subq %rdi, %rdx
> # endif
> # else
> - addq $VEC_SIZE, %rdi
> + addq $(VEC_SIZE + (VEC_SIZE * 4 - BASE_OFFSET)), %rdi
> andq $-(4 * VEC_SIZE), %rdi
> # endif
> -
> +# ifdef USE_IN_RTM
> vpxorq %XMMZERO, %XMMZERO, %XMMZERO
> +# else
> + /* copy ymmmatch to ymm0 so we can use vpcmpeq which is not
> + encodable with EVEX registers (ymm16-ymm31). */
> + vmovdqa64 %YMMMATCH, %ymm0
> +# endif
>
> /* Compare 4 * VEC at a time forward. */
> .p2align 4
> L(loop_4x_vec):
> + /* Two versions of the loop. One that does not require
> + vzeroupper by not using ymm0-ymm15 and another does that require
> + vzeroupper because it uses ymm0-ymm15. The reason why ymm0-ymm15
> + is used at all is because there is no EVEX encoding vpcmpeq and
> + with vpcmpeq this loop can be performed more efficiently. The
> + non-vzeroupper version is safe for RTM while the vzeroupper
> + version should be prefered if RTM are not supported. */
> +# ifdef USE_IN_RTM
> /* It would be possible to save some instructions using 4x VPCMP
> but bottleneck on port 5 makes it not woth it. */
> VPCMP $4, (VEC_SIZE * 4)(%rdi), %YMMMATCH, %k1
> @@ -273,12 +313,55 @@ L(loop_4x_vec):
> /* Reduce VEC2 / VEC3 with min and VEC1 with zero mask. */
> VPMINU %YMM2, %YMM3, %YMM3 {%k1} {z}
> VPCMP $0, %YMM3, %YMMZERO, %k2
> +# else
> + /* Since vptern can only take 3x vectors fastest to do 1 vec
> + seperately with EVEX vpcmp. */
> +# ifdef USE_AS_WMEMCHR
> + /* vptern can only accept masks for epi32/epi64 so can only save
> + instruction using not equals mask on vptern with wmemchr. */
> + VPCMP $4, (%rdi), %YMMMATCH, %k1
> +# else
> + VPCMP $0, (%rdi), %YMMMATCH, %k1
> +# endif
> + /* Compare 3x with vpcmpeq and or them all together with vptern.
> + */
> + VPCMPEQ VEC_SIZE(%rdi), %ymm0, %ymm2
> + VPCMPEQ (VEC_SIZE * 2)(%rdi), %ymm0, %ymm3
> + VPCMPEQ (VEC_SIZE * 3)(%rdi), %ymm0, %ymm4
> +# ifdef USE_AS_WMEMCHR
> + /* This takes the not of or between ymm2, ymm3, ymm4 as well as
> + combines result from VEC0 with zero mask. */
> + vpternlogd $1, %ymm2, %ymm3, %ymm4 {%k1} {z}
> + vpmovmskb %ymm4, %ecx
> +# else
> + /* 254 is mask for oring ymm2, ymm3, ymm4 into ymm4. */
> + vpternlogd $254, %ymm2, %ymm3, %ymm4
> + vpmovmskb %ymm4, %ecx
> + kmovd %k1, %eax
> +# endif
> +# endif
> +
> # ifdef USE_AS_RAWMEMCHR
> subq $-(VEC_SIZE * 4), %rdi
> +# endif
> +# ifdef USE_IN_RTM
> kortestd %k2, %k3
> +# else
> +# ifdef USE_AS_WMEMCHR
> + /* ecx contains not of matches. All 1s means no matches. incl will
> + overflow and set zeroflag if that is the case. */
> + incl %ecx
> +# else
> + /* If either VEC1 (eax) or VEC2-VEC4 (ecx) are not zero. Adding
> + to ecx is not an issue because if eax is non-zero it will be
> + used for returning the match. If it is zero the add does
> + nothing. */
> + addq %rax, %rcx
> +# endif
> +# endif
> +# ifdef USE_AS_RAWMEMCHR
> jz L(loop_4x_vec)
> # else
> - kortestd %k2, %k3
> jnz L(loop_4x_vec_end)
>
> subq $-(VEC_SIZE * 4), %rdi
> @@ -288,9 +371,11 @@ L(loop_4x_vec):
>
> /* Fall through into less than 4 remaining vectors of length case.
> */
> - VPCMP $0, (VEC_SIZE * 4)(%rdi), %YMMMATCH, %k0
> + VPCMP $0, BASE_OFFSET(%rdi), %YMMMATCH, %k0
> + addq $(BASE_OFFSET - VEC_SIZE), %rdi
> kmovd %k0, %eax
> - addq $(VEC_SIZE * 3), %rdi
> + VZEROUPPER
> +
> .p2align 4
I think this ".p2align 4" can be removed since it isn't in a loop.
> L(last_4x_vec_or_less):
> /* Check if first VEC contained match. */
> @@ -338,73 +423,78 @@ L(loop_4x_vec_end):
> /* rawmemchr will fall through into this if match was found in
> loop. */
>
> +# if defined USE_IN_RTM || defined USE_AS_WMEMCHR
> /* k1 has not of matches with VEC1. */
> kmovd %k1, %eax
> -# ifdef USE_AS_WMEMCHR
> +# ifdef USE_AS_WMEMCHR
> subl $((1 << CHAR_PER_VEC) - 1), %eax
> -# else
> +# else
> incl %eax
> +# endif
> +# else
> + /* eax already has matches for VEC1. */
> + testl %eax, %eax
> # endif
> jnz L(last_vec_x1_return)
>
> +# ifdef USE_IN_RTM
> VPCMP $0, %YMM2, %YMMZERO, %k0
> kmovd %k0, %eax
> +# else
> + vpmovmskb %ymm2, %eax
> +# endif
> testl %eax, %eax
> jnz L(last_vec_x2_return)
>
> +# ifdef USE_IN_RTM
> kmovd %k2, %eax
> testl %eax, %eax
> jnz L(last_vec_x3_return)
>
> kmovd %k3, %eax
> tzcntl %eax, %eax
> -# ifdef USE_AS_RAWMEMCHR
> - leaq (VEC_SIZE * 3)(%rdi, %rax, CHAR_SIZE), %rax
> + leaq (VEC_SIZE * 3 + RET_OFFSET)(%rdi, %rax, CHAR_SIZE), %rax
> # else
> - leaq (VEC_SIZE * 7)(%rdi, %rax, CHAR_SIZE), %rax
> + vpmovmskb %ymm3, %eax
> + /* Combine matches in VEC3 (eax) with matches in VEC4 (ecx). */
> + salq $VEC_SIZE, %rcx
> + orq %rcx, %rax
> + tzcntq %rax, %rax
> + leaq (VEC_SIZE * 2 + RET_OFFSET)(%rdi, %rax), %rax
> + VZEROUPPER
> # endif
> ret
>
> .p2align 4
> L(last_vec_x1_return):
> tzcntl %eax, %eax
> -# ifdef USE_AS_RAWMEMCHR
> -# ifdef USE_AS_WMEMCHR
> +# if defined USE_AS_WMEMCHR || RET_OFFSET != 0
> /* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
> - leaq (%rdi, %rax, CHAR_SIZE), %rax
> -# else
> - addq %rdi, %rax
> -# endif
> + leaq RET_OFFSET(%rdi, %rax, CHAR_SIZE), %rax
> # else
> - /* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
> - leaq (VEC_SIZE * 4)(%rdi, %rax, CHAR_SIZE), %rax
> + addq %rdi, %rax
> # endif
> + VZEROUPPER
> ret
>
> .p2align 4
> L(last_vec_x2_return):
> tzcntl %eax, %eax
> -# ifdef USE_AS_RAWMEMCHR
> - /* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
> - leaq VEC_SIZE(%rdi, %rax, CHAR_SIZE), %rax
> -# else
> - /* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
> - leaq (VEC_SIZE * 5)(%rdi, %rax, CHAR_SIZE), %rax
> -# endif
> + /* NB: Multiply bytes by RET_SCALE to get the wchar_t count
> + if relevant (RET_SCALE = CHAR_SIZE if USE_AS_WMEMCHAR and
> + USE_IN_RTM are both defined. Otherwise RET_SCALE = 1. */
> + leaq (VEC_SIZE + RET_OFFSET)(%rdi, %rax, RET_SCALE), %rax
> + VZEROUPPER
> ret
>
> +# ifdef USE_IN_RTM
> .p2align 4
> L(last_vec_x3_return):
> tzcntl %eax, %eax
> -# ifdef USE_AS_RAWMEMCHR
> - /* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
> - leaq (VEC_SIZE * 2)(%rdi, %rax, CHAR_SIZE), %rax
> -# else
> /* NB: Multiply bytes by CHAR_SIZE to get the wchar_t count. */
> - leaq (VEC_SIZE * 6)(%rdi, %rax, CHAR_SIZE), %rax
> -# endif
> + leaq (VEC_SIZE * 2 + RET_OFFSET)(%rdi, %rax, CHAR_SIZE), %rax
> ret
> -
> +# endif
>
> # ifndef USE_AS_RAWMEMCHR
> L(last_4x_vec_or_less_cmpeq):
> diff --git a/sysdeps/x86_64/multiarch/memchr.c b/sysdeps/x86_64/multiarch/memchr.c
> index 6ad94f5775..37b088e5be 100644
> --- a/sysdeps/x86_64/multiarch/memchr.c
> +++ b/sysdeps/x86_64/multiarch/memchr.c
> @@ -24,7 +24,7 @@
> # undef memchr
>
> # define SYMBOL_NAME memchr
> -# include "ifunc-avx2.h"
> +# include "ifunc-memchr.h"
>
> libc_ifunc_redirected (__redirect_memchr, memchr, IFUNC_SELECTOR ());
> strong_alias (memchr, __memchr)
> diff --git a/sysdeps/x86_64/multiarch/rawmemchr-evex-rtm.S b/sysdeps/x86_64/multiarch/rawmemchr-evex-rtm.S
> new file mode 100644
> index 0000000000..deda1ca395
> --- /dev/null
> +++ b/sysdeps/x86_64/multiarch/rawmemchr-evex-rtm.S
> @@ -0,0 +1,3 @@
> +#define MEMCHR __rawmemchr_evex_rtm
> +#define USE_AS_RAWMEMCHR 1
> +#include "memchr-evex-rtm.S"
> diff --git a/sysdeps/x86_64/multiarch/rawmemchr.c b/sysdeps/x86_64/multiarch/rawmemchr.c
> index 8ef2468400..01e5be080c 100644
> --- a/sysdeps/x86_64/multiarch/rawmemchr.c
> +++ b/sysdeps/x86_64/multiarch/rawmemchr.c
> @@ -26,7 +26,7 @@
> # undef __rawmemchr
>
> # define SYMBOL_NAME rawmemchr
> -# include "ifunc-avx2.h"
> +# include "ifunc-memchr.h"
>
> libc_ifunc_redirected (__redirect_rawmemchr, __rawmemchr,
> IFUNC_SELECTOR ());
> diff --git a/sysdeps/x86_64/multiarch/wmemchr-evex-rtm.S b/sysdeps/x86_64/multiarch/wmemchr-evex-rtm.S
> new file mode 100644
> index 0000000000..5d568c5cb7
> --- /dev/null
> +++ b/sysdeps/x86_64/multiarch/wmemchr-evex-rtm.S
> @@ -0,0 +1,3 @@
> +#define MEMCHR __wmemchr_evex_rtm
> +#define USE_AS_WCSCHR 1
> +#include "memchr-evex-rtm.S"
> diff --git a/sysdeps/x86_64/multiarch/wmemchr.c b/sysdeps/x86_64/multiarch/wmemchr.c
> index 393d520658..ba108b8672 100644
> --- a/sysdeps/x86_64/multiarch/wmemchr.c
> +++ b/sysdeps/x86_64/multiarch/wmemchr.c
> @@ -26,7 +26,7 @@
> # undef __wmemchr
>
> # define SYMBOL_NAME wmemchr
> -# include "ifunc-avx2.h"
> +# include "ifunc-memchr.h"
>
> libc_ifunc_redirected (__redirect_wmemchr, __wmemchr, IFUNC_SELECTOR ());
> weak_alias (__wmemchr, wmemchr)
> --
> 2.29.2
>
Thanks.
H.J.
next prev parent reply other threads:[~2021-05-06 13:39 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-04 23:32 Noah Goldstein
2021-05-05 13:22 ` H.J. Lu
2021-05-05 16:24 ` Noah Goldstein
2021-05-05 17:54 ` H.J. Lu
2021-05-05 18:18 ` Noah Goldstein
2021-05-05 18:29 ` H.J. Lu
2021-05-05 18:38 ` Noah Goldstein
2021-05-05 18:44 ` Noah Goldstein
2021-05-06 13:38 ` H.J. Lu [this message]
2021-05-06 18:14 ` Noah Goldstein
2021-05-06 19:06 ` H.J. Lu
2021-05-06 13:55 ` H.J. Lu
2021-05-06 18:01 ` Noah Goldstein
2021-05-06 19:09 ` H.J. Lu
2021-05-06 23:55 ` [PATCH v2] " Noah Goldstein
2021-05-07 13:22 ` H.J. Lu
2021-05-07 18:17 ` [PATCH v3] " Noah Goldstein
2021-05-07 18:24 ` H.J. Lu
2021-05-08 4:06 ` [PATCH v4] " Noah Goldstein
2021-05-08 12:58 ` H.J. Lu
2022-04-27 23:57 ` Sunil Pandey
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