diff options
| author | Leonhard Holz <leonhard.holz@web.de> | 2015-06-22 07:53:09 +0530 |
|---|---|---|
| committer | Siddhesh Poyarekar <siddhesh@redhat.com> | 2015-06-22 07:53:09 +0530 |
| commit | ef635a29f7123f25ee0600b7a6aca1c511c63e85 (patch) | |
| tree | e509ae02011879deda5c2a011722db8c0ccbbe95 /string | |
| parent | f48b67323ad6a6d8f0c2f4128c07392a9a01c20b (diff) | |
| download | glibc-ef635a29f7123f25ee0600b7a6aca1c511c63e85.tar.gz glibc-ef635a29f7123f25ee0600b7a6aca1c511c63e85.tar.xz glibc-ef635a29f7123f25ee0600b7a6aca1c511c63e85.zip | |
remove unnecessary memset in strcoll
This patch avoids some initialization overhead in the hot path of strcoll by
replacing a memset with zero assignments. It improves the file listing benchmark
by 15% on x86. Tests are ok.
filelist#C -1.30%
filelist#en_US.UTF-8 -15.08%
lorem_ipsum#vi_VN.UTF-8 -15.04%
lorem_ipsum#ar_SA.UTF-8 -11.83%
lorem_ipsum#en_US.UTF-8 -9.66%
lorem_ipsum#zh_CN.UTF-8 -8.63%
lorem_ipsum#cs_CZ.UTF-8 -8.28%
lorem_ipsum#en_GB.UTF-8 -18.07%
lorem_ipsum#da_DK.UTF-8 -11.13%
lorem_ipsum#pl_PL.UTF-8 -15.31%
lorem_ipsum#fr_FR.UTF-8 -12.26%
lorem_ipsum#pt_PT.UTF-8 -10.64%
lorem_ipsum#el_GR.UTF-8 -8.19%
lorem_ipsum#ru_RU.UTF-8 -0.65%
lorem_ipsum#iw_IL.UTF-8 -14.92%
lorem_ipsum#es_ES.UTF-8 -11.47%
lorem_ipsum#hi_IN.UTF-8 -1.05%
lorem_ipsum#sv_SE.UTF-8 6.44%
lorem_ipsum#hu_HU.UTF-8 -9.85%
lorem_ipsum#tr_TR.UTF-8 -14.96%
lorem_ipsum#is_IS.UTF-8 -10.35%
lorem_ipsum#it_IT.UTF-8 -11.33%
lorem_ipsum#sr_RS.UTF-8 -9.88%
lorem_ipsum#ja_JP.UTF-8 -3.23%
* string/strcoll_l.c (STRCOLL): Remove unnecessary memset.
Diffstat (limited to 'string')
| -rw-r--r-- | string/strcoll_l.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/string/strcoll_l.c b/string/strcoll_l.c index 967bbba231..8f1225fc7a 100644 --- a/string/strcoll_l.c +++ b/string/strcoll_l.c @@ -315,8 +315,11 @@ STRCOLL (const STRING_TYPE *s1, const STRING_TYPE *s2, __locale_t l) int result = 0, rule = 0; coll_seq seq1, seq2; - memset (&seq1, 0, sizeof (seq1)); - seq2 = seq1; + seq1.len = 0; + seq1.idxmax = 0; + seq1.rule = 0; + seq2.len = 0; + seq2.idxmax = 0; for (int pass = 0; pass < nrules; ++pass) { |