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| author | Vidya Ranganathan <vidya@linux.vnet.ibm.com> | 2014-03-10 12:20:36 -0400 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-03-11 14:20:16 -0500 |
| commit | afd75351c2f3cae4a2daf88c50faad889e3a0f2b (patch) | |
| tree | 67b2fc3dd6a65471372aaa968df90e0ace69bfce /string | |
| parent | e5829d82c88117c9f4752cedfefc8516cb9ffdf7 (diff) | |
| download | glibc-afd75351c2f3cae4a2daf88c50faad889e3a0f2b.zip glibc-afd75351c2f3cae4a2daf88c50faad889e3a0f2b.tar.gz glibc-afd75351c2f3cae4a2daf88c50faad889e3a0f2b.tar.bz2 | |
PowerPC: strspn optimization for PPC64/POWER7
The optimization is achieved by following techniques:
> hashing of needle.
> hashing avoids scanning of duplicate entries in needle across the string.
> initializing the hash table with Vector instructions (VSX) by quadword access.
> unrolling when scanning for character in string across hash table.
Diffstat (limited to 'string')
| -rw-r--r-- | string/strspn.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/string/strspn.c b/string/strspn.c index 37e8161..c2d6364 100644 --- a/string/strspn.c +++ b/string/strspn.c @@ -18,13 +18,14 @@ #include <string.h> #undef strspn +#ifndef STRSPN +#define STRSPN strspn +#endif /* Return the length of the maximum initial segment of S which contains only characters in ACCEPT. */ size_t -strspn (s, accept) - const char *s; - const char *accept; +STRSPN (const char *s, const char *accept) { const char *p; const char *a; |