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[Bug preprocessor/53525] New: Performance regression due to enabling track-macro-expansion
- From: "jimis at gmx dot net" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 30 May 2012 03:27:06 +0000
- Subject: [Bug preprocessor/53525] New: Performance regression due to enabling track-macro-expansion
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53525
Bug #: 53525
Summary: Performance regression due to enabling
track-macro-expansion
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: jimis@gmx.net
About 3% regression on cc1 -O0 compilation time has been noticed between
gcc-4.8-20120429 and gcc-4.8-20120513. The culprit seems to be enabling by
default -ftrack-macro-expansion (TME). Example time, instruction count and
memory usage for compiling reload.c follow.
time M Instr KB RAM
noTME 0.744s 2081 28608
TME 0.785s 2201 31672