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S390: Optimize strlen and wcslen.

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This patch provides optimized versions of strlen and wcslen with the z13 vector
instructions.
The helper macro IFUNC_VX_IMPL is introduced and is used to register all
__<func>_c() and __<func>_vx() functions within __libc_ifunc_impl_list()
to the ifunc test framework.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile: New File.
	* sysdeps/s390/multiarch/strlen-c.c: Likewise.
	* sysdeps/s390/multiarch/strlen-vx.S: Likewise.
	* sysdeps/s390/multiarch/strlen.c: Likewise.
	* sysdeps/s390/multiarch/wcslen-c.c: Likewise.
	* sysdeps/s390/multiarch/wcslen-vx.S: Likewise.
	* sysdeps/s390/multiarch/wcslen.c: Likewise.
	* string/strlen.c (STRLEN): Define and use macro.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(IFUNC_VX_IMPL): New macro function.
	(__libc_ifunc_impl_list): Add ifunc test for strlen, wcslen.
	* benchtests/Makefile (wcsmbs-bench): New variable.
	(string-bench-all): Added wcsmbs-bench.
	* benchtests/bench-wcslen.c: New File.
This commit is contained in:
Stefan Liebler
2015-08-26 10:26:20 +02:00
committed by Andreas Krebbel
parent fd484e057d
commit 9472f35a0a
12 changed files with 348 additions and 2 deletions
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6
string/strlen.c
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@ -23,10 +23,14 @@
#undef strlen
#ifndef STRLEN
# define STRLEN strlen
#endif
/* Return the length of the null-terminated string STR. Scan for
the null terminator quickly by testing four bytes at a time. */
size_t
strlen (const char *str)
STRLEN (const char *str)
{
const char *char_ptr;
const unsigned long int *longword_ptr;