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| author | Zachary Turner <zturner@google.com> | 2017-11-30 23:00:30 +0000 |
|---|---|---|
| committer | Zachary Turner <zturner@google.com> | 2017-11-30 23:00:30 +0000 |
| commit | f0e4c6a819799ef578cba48df890d15441ad3f9a (patch) | |
| tree | c1da6a2cdc419560c0ff5837598af7ae0a859dbe /llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp | |
| parent | 03c17a0c8788b81994329800288fef12cb6dacd3 (diff) | |
| download | bcm5719-llvm-f0e4c6a819799ef578cba48df890d15441ad3f9a.tar.gz bcm5719-llvm-f0e4c6a819799ef578cba48df890d15441ad3f9a.zip | |
Simplify the DenseSet used for hashing CodeView records.
This was storing the hash alongside the key so that the hash
doesn't need to be re-computed every time, but in doing so it
was allocating a structure to keep the key size small in the
DenseMap. This is a noble goal, but it also leads to a pointer
indirection on every probe, and this cost of this pointer
indirection ends up being higher than the cost of having a
slightly larger entry in the hash table. Removing this not only
simplifies the code, but yields a small but noticeable
performance improvement in the type merging algorithm.
llvm-svn: 319493
Diffstat (limited to 'llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp')
0 files changed, 0 insertions, 0 deletions
