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| author | Ben Langmuir <blangmuir@apple.com> | 2015-04-10 22:25:42 +0000 |
|---|---|---|
| committer | Ben Langmuir <blangmuir@apple.com> | 2015-04-10 22:25:42 +0000 |
| commit | eb8bd2d9b3776ead6c185394806264522e29f6c4 (patch) | |
| tree | 4668910d415cad892571b6b4fbe2d5fdc6fd7acf /llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp | |
| parent | b4bf14ceaad62093878999a02409ac6a94b82b01 (diff) | |
| download | bcm5719-llvm-eb8bd2d9b3776ead6c185394806264522e29f6c4.tar.gz bcm5719-llvm-eb8bd2d9b3776ead6c185394806264522e29f6c4.zip | |
Workaround a performance issue with modules + PCH
More fallout from r228234; when looking up an identifier in a PCH that
imports the Cocoa module on Darwin, it was taking 2 to 5 seconds
because we were hammering the MapVector::erase() function, which is
O(n). For now, just clear() the contained SmallVector to get back to
0.25 - 0.5 seconds. This is probably not the long-term fix, because
without modules or without PCH the performance is more like 0.02
seconds.
llvm-svn: 234655
Diffstat (limited to 'llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp')
0 files changed, 0 insertions, 0 deletions
