http://llvm.org/bugs/show_bug.cgi?id=20999
Bug ID: 20999
Summary: Command line parsing is slow
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Driver
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
I was looking at why test/Driver/response-file.c is slow. I found that given
300_000 options (just repeated -DTEST), the driver will call
llvm::opt::Option::matches about 349_802_000 times.
To reproduce, add a counter to llvm::opt::Option::matches and run
/bin/clang -E @..../response-file.c.tmp.1.txt response-file.c -###
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