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| author | Feng Xue <fxue@os.amperecomputing.com> | 2018-08-09 04:38:03 -0400 |
|---|---|---|
| committer | Feng Xue <fxue@os.amperecomputing.com> | 2019-02-01 08:14:21 -0500 |
| commit | 83d1cc42d8e6b18a4b6ba53addfdae98c694ea36 (patch) | |
| tree | 31baf4b5309964aadf357cb81b21f5e6614a983e /sysdeps/aarch64/memchr.S | |
| parent | c7d3890ff51bceb38fac0947ce1f2bb0c34f6b15 (diff) | |
| download | glibc-83d1cc42d8e6b18a4b6ba53addfdae98c694ea36.tar.gz glibc-83d1cc42d8e6b18a4b6ba53addfdae98c694ea36.tar.xz glibc-83d1cc42d8e6b18a4b6ba53addfdae98c694ea36.zip | |
aarch64: Optimized memchr specific to AmpereComputing emag
This version uses general register based memory instruction to load
data, because vector register based is slightly slower in emag.
Character-matching is performed on 16-byte (both size and alignment)
memory block in parallel each iteration.
* sysdeps/aarch64/memchr.S (__memchr): Rename to MEMCHR.
[!MEMCHR](MEMCHR): Set to __memchr.
* sysdeps/aarch64/multiarch/Makefile (sysdep_routines):
Add memchr_generic and memchr_nosimd.
* sysdeps/aarch64/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Add memchr ifuncs.
* sysdeps/aarch64/multiarch/memchr.c: New file.
* sysdeps/aarch64/multiarch/memchr_generic.S: Likewise.
* sysdeps/aarch64/multiarch/memchr_nosimd.S: Likewise.
Diffstat (limited to 'sysdeps/aarch64/memchr.S')
| -rw-r--r-- | sysdeps/aarch64/memchr.S | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/sysdeps/aarch64/memchr.S b/sysdeps/aarch64/memchr.S index bb7b971e04..7023d913e7 100644 --- a/sysdeps/aarch64/memchr.S +++ b/sysdeps/aarch64/memchr.S @@ -26,6 +26,10 @@ * Neon Available. */ +#ifndef MEMCHR +# define MEMCHR __memchr +#endif + /* Arguments and results. */ #define srcin x0 #define chrin w1 @@ -59,7 +63,7 @@ * identify exactly which byte has matched. */ -ENTRY (__memchr) +ENTRY (MEMCHR) /* Do not dereference srcin if no bytes to compare. */ cbz cntin, L(zero_length) /* @@ -152,6 +156,6 @@ L(tail): L(zero_length): mov result, #0 ret -END (__memchr) -weak_alias (__memchr, memchr) +END (MEMCHR) +weak_alias (MEMCHR, memchr) libc_hidden_builtin_def (memchr) |