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| author | Chris Lattner <sabre@nondot.org> | 2008-03-21 21:33:23 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-03-21 21:33:23 +0000 |
| commit | beb216da0a48b89a6050f55e3f2fa58e47452d8c (patch) | |
| tree | 305f1d9208c3486e81f210acbb1a996703dcad76 /llvm/lib/Transforms | |
| parent | 181f72369f6d68f9ad9f926dd9cea9b09974f1db (diff) | |
| download | bcm5719-llvm-beb216da0a48b89a6050f55e3f2fa58e47452d8c.tar.gz bcm5719-llvm-beb216da0a48b89a6050f55e3f2fa58e47452d8c.zip | |
make gvn marginally faster by reallocating the lastSeenLoad map for
each basic block.
llvm-svn: 48660
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/GVN.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp index 077fa67e0bd..eb91b5a043d 100644 --- a/llvm/lib/Transforms/Scalar/GVN.cpp +++ b/llvm/lib/Transforms/Scalar/GVN.cpp @@ -1287,15 +1287,16 @@ bool GVN::iterateOnFunction(Function &F) { DominatorTree &DT = getAnalysis<DominatorTree>(); SmallVector<Instruction*, 4> toErase; - + DenseMap<Value*, LoadInst*> lastSeenLoad; + // Top-down walk of the dominator tree for (df_iterator<DomTreeNode*> DI = df_begin(DT.getRootNode()), E = df_end(DT.getRootNode()); DI != E; ++DI) { // Get the set to update for this block ValueNumberedSet& currAvail = availableOut[DI->getBlock()]; - DenseMap<Value*, LoadInst*> lastSeenLoad; - + lastSeenLoad.clear(); + BasicBlock* BB = DI->getBlock(); // A block inherits AVAIL_OUT from its dominator |
