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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2011-12-06 16:14:29 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2011-12-06 16:14:29 +0000 |
| commit | 88c09143b6af07ed7b16381885a03c4b10886f96 (patch) | |
| tree | bf43148ac9de4f7f2cc7438f7093c8c00313c552 /lib/CodeGen/DFAPacketizer.cpp | |
| parent | 85dadecbd664f60f0c7e4fbb44f083d43d01cfb7 (diff) | |
Simplify common predecessor finding.
- Walking over pred_begin/pred_end is an expensive operation.
- PHINodes contain a value for each predecessor anyway.
- While it may look like we used to save a few iterations with the set,
be aware that getIncomingValueForBlock does a linear search on
the values of the phi node.
- Another -5% on ARMDisassembler.cpp (Release build). This was the last
entry in the profile that was obviously wasting time.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145937 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/DFAPacketizer.cpp')
0 files changed, 0 insertions, 0 deletions