Dan Gohman b08ba8824e Fix (at least) quadratic worst-case complexity in DominanceFrontier::splitBlock: ...

don't visit all blocks in the function, and don't iterate over the split blocks'
predecessor lists for each block visited.

Also, remove the special-case test for the entry block. Splitting the entry
block isn't common enough to make this worthwhile.

This fixes a major compile-time bottleneck which is exposed now that
LoopSimplify isn't being redundantly run both before and after
DominanceFrontier.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109408 91177308-0d34-0410-b5e6-96231b3b80d8

2010-07-26 17:55:15 +00:00

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