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authorNoah Goldstein <goldstein.w.n@gmail.com>2021-06-23 01:19:34 -0400
committerNoah Goldstein <goldstein.w.n@gmail.com>2021-06-23 14:12:36 -0400
commit6f573a27b6c8b4236445810a44660612323f5a73 (patch)
tree3159bf94549e7e2e0458c05e9b992321b7c67026 /sysdeps
parenta0db678071c60b6c47c468d231dd0b3694ba7a98 (diff)
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x86-64: Add wcslen optimize for sse4.1
No bug. This comment adds the ifunc / build infrastructure necessary for wcslen to prefer the sse4.1 implementation in strlen-vec.S. test-wcslen.c is passing. Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/x86_64/multiarch/Makefile4
-rw-r--r--sysdeps/x86_64/multiarch/ifunc-impl-list.c3
-rw-r--r--sysdeps/x86_64/multiarch/ifunc-wcslen.h52
-rw-r--r--sysdeps/x86_64/multiarch/wcslen-sse4_1.S4
-rw-r--r--sysdeps/x86_64/multiarch/wcslen.c2
-rw-r--r--sysdeps/x86_64/multiarch/wcsnlen.c34
6 files changed, 63 insertions, 36 deletions
diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile
index 2c2aad3..26be409 100644
--- a/sysdeps/x86_64/multiarch/Makefile
+++ b/sysdeps/x86_64/multiarch/Makefile
@@ -95,8 +95,8 @@ sysdep_routines += wmemcmp-sse4 wmemcmp-ssse3 wmemcmp-c \
wcscpy-ssse3 wcscpy-c \
wcschr-sse2 wcschr-avx2 \
wcsrchr-sse2 wcsrchr-avx2 \
- wcsnlen-sse4_1 wcsnlen-c \
- wcslen-sse2 wcslen-avx2 wcsnlen-avx2 \
+ wcslen-sse2 wcslen-sse4_1 wcslen-avx2 \
+ wcsnlen-c wcsnlen-sse4_1 wcsnlen-avx2 \
wcschr-avx2-rtm \
wcscmp-avx2-rtm \
wcslen-avx2-rtm \
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
index 15eda47..dbd1ebf 100644
--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
@@ -684,6 +684,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
&& CPU_FEATURE_USABLE (AVX512BW)
&& CPU_FEATURE_USABLE (BMI2)),
__wcslen_evex)
+ IFUNC_IMPL_ADD (array, i, wcsnlen,
+ CPU_FEATURE_USABLE (SSE4_1),
+ __wcsnlen_sse4_1)
IFUNC_IMPL_ADD (array, i, wcslen, 1, __wcslen_sse2))
/* Support sysdeps/x86_64/multiarch/wcsnlen.c. */
diff --git a/sysdeps/x86_64/multiarch/ifunc-wcslen.h b/sysdeps/x86_64/multiarch/ifunc-wcslen.h
new file mode 100644
index 0000000..39e3347
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/ifunc-wcslen.h
@@ -0,0 +1,52 @@
+/* Common definition for ifunc selections for wcslen and wcsnlen
+ 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 (sse4_1) 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;
+
+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))
+ 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);
+ }
+
+ if (CPU_FEATURE_USABLE_P (cpu_features, SSE4_1))
+ return OPTIMIZE (sse4_1);
+
+ return OPTIMIZE (sse2);
+}
diff --git a/sysdeps/x86_64/multiarch/wcslen-sse4_1.S b/sysdeps/x86_64/multiarch/wcslen-sse4_1.S
new file mode 100644
index 0000000..7e62621
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/wcslen-sse4_1.S
@@ -0,0 +1,4 @@
+#define AS_WCSLEN
+#define strlen __wcslen_sse4_1
+
+#include "strlen-vec.S"
diff --git a/sysdeps/x86_64/multiarch/wcslen.c b/sysdeps/x86_64/multiarch/wcslen.c
index f89bed4..3032061 100644
--- a/sysdeps/x86_64/multiarch/wcslen.c
+++ b/sysdeps/x86_64/multiarch/wcslen.c
@@ -24,7 +24,7 @@
# undef __wcslen
# define SYMBOL_NAME wcslen
-# include "ifunc-avx2.h"
+# include "ifunc-wcslen.h"
libc_ifunc_redirected (__redirect_wcslen, __wcslen, IFUNC_SELECTOR ());
weak_alias (__wcslen, wcslen);
diff --git a/sysdeps/x86_64/multiarch/wcsnlen.c b/sysdeps/x86_64/multiarch/wcsnlen.c
index 4983f1b..2963fbe 100644
--- a/sysdeps/x86_64/multiarch/wcsnlen.c
+++ b/sysdeps/x86_64/multiarch/wcsnlen.c
@@ -24,39 +24,7 @@
# undef __wcsnlen
# define SYMBOL_NAME wcsnlen
-# include <init-arch.h>
-
-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;
-extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_rtm) attribute_hidden;
-extern __typeof (REDIRECT_NAME) OPTIMIZE (evex) 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_FEATURES_ARCH_P (cpu_features, AVX_Fast_Unaligned_Load))
- {
- if (CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
- && CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
- && CPU_FEATURE_USABLE_P (cpu_features, BMI2))
- 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);
- }
-
- if (CPU_FEATURE_USABLE_P (cpu_features, SSE4_1))
- return OPTIMIZE (sse4_1);
-
- return OPTIMIZE (sse2);
-}
+# include "ifunc-wcslen.h"
libc_ifunc_redirected (__redirect_wcsnlen, __wcsnlen, IFUNC_SELECTOR ());
weak_alias (__wcsnlen, wcsnlen);