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[Bug regex/605] New: regex goes uselessly through slow paths
- From: "bonzini at gnu dot org" <sourceware-bugzilla at sources dot redhat dot com>
- To: glibc-bugs at sources dot redhat dot com
- Date: 10 Dec 2004 16:53:55 -0000
- Subject: [Bug regex/605] New: regex goes uselessly through slow paths
- Reply-to: sourceware-bugzilla at sources dot redhat dot com
An improvement of 10-30% in the speed of the matcher (LC_ALL=C or other
single-byte character sets) can be achieved by avoiding that OP_PERIOD goes
through the slow multibyte paths. This is done by the attached patch.
While this patch only affects SBCS (i.e. scripts, which are starting to use
LC_ALL=C to avoid bugs due to the collation rules of some languages), in
principle UTF-8 optimization could be fixed to be optimizable as well. The
slowness of prune_impossible_nodes, alas, makes this impractical yet.
--
Summary: regex goes uselessly through slow paths
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: regex
AssignedTo: bonzini at gnu dot org
ReportedBy: bonzini at gnu dot org
CC: glibc-bugs-regex at sources dot redhat dot com,glibc-
bugs at sources dot redhat dot com
OtherBugsDependingO 500
nThis:
http://sources.redhat.com/bugzilla/show_bug.cgi?id=605
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