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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2018-08-03 17:24:12 +0100 |
|---|---|---|
| committer | Wilco Dijkstra <wdijkstr@arm.com> | 2018-08-03 17:24:12 +0100 |
| commit | 284f42bc778e487dfd5dff5c01959f93b9e0c4f5 (patch) | |
| tree | 4480c734a632b75194a0b4fd062b65057d6e2ad7 /support/xpthread_barrierattr_init.c | |
| parent | 430388d5dc0e1861b869096f4f5d946d7d74232a (diff) | |
| download | glibc-284f42bc778e487dfd5dff5c01959f93b9e0c4f5.tar.gz | |
Simplify and speedup strstr/strcasestr first match
Looking at the benchtests, both strstr and strcasestr spend a lot of time
in a slow initialization loop handling one character per iteration.
This can be simplified and use the much faster strlen/strnlen/strchr/memcmp.
Read ahead a few cachelines to reduce the number of strnlen calls, which
improves performance by ~3-4%. This patch improves the time taken for the
full strstr benchtest by >40%.
* string/strcasestr.c (STRCASESTR): Simplify and speedup first match.
* string/strstr.c (AVAILABLE): Likewise.
Diffstat (limited to 'support/xpthread_barrierattr_init.c')
0 files changed, 0 insertions, 0 deletions