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Improve bench-strlen 

The current bench-strlen compares against a slow byte-oriented strlen which
is not useful given it's too easy to beat.  Remove it and compare against the
generic C strlen version and memchr.

	* benchtests/bench-strlen.c (generic_strlen): New function.
	(memchr_strlen): New function.
This commit is contained in:
Wilco Dijkstra 2018-12-27 14:56:23 +00:00
parent ba4b8fab20
commit 5289f1f56b
2 changed files with 25 additions and 14 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-12-27 Wilco Dijkstra <wdijkstr@arm.com>
* benchtests/bench-strlen.c (generic_strlen): New function.
(memchr_strlen): New function.
2018-12-26 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86_64/fpu/s_sincosf.S: Removed.

34
benchtests/bench-strlen.c
View File

@ -24,24 +24,15 @@
#endif
#include "bench-string.h"
#ifndef WIDE
# define MAX_CHAR CHAR_MAX
#else
# define MAX_CHAR WCHAR_MAX
#endif
#include "json-lib.h"
typedef size_t (*proto_t) (const CHAR *);
size_t
simple_STRLEN (const CHAR *s)
{
const CHAR *p;
size_t generic_strlen (const CHAR *);
size_t memchr_strlen (const CHAR *);
for (p = s; *p; ++p);
return p - s;
}
IMPL (memchr_strlen, 0)
IMPL (generic_strlen, 0)
#ifndef WIDE
size_t
@ -52,7 +43,12 @@ builtin_strlen (const CHAR *p)
IMPL (builtin_strlen, 0)
#endif
IMPL (simple_STRLEN, 0)
size_t
memchr_strlen (const CHAR *p)
{
return (const CHAR *)MEMCHR (p, 0, PTRDIFF_MAX) - p;
}
IMPL (STRLEN, 1)
@ -161,3 +157,13 @@ test_main (void)
}
#include <support/test-driver.c>
#define libc_hidden_builtin_def(X)
#ifndef WIDE
# undef STRLEN
# define STRLEN generic_strlen
# include <string/strlen.c>
#else
# define WCSLEN generic_strlen
# include <wcsmbs/wcslen.c>
#endif