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| author | Dan Gohman <gohman@apple.com> | 2009-11-14 02:06:30 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-11-14 02:06:30 +0000 |
| commit | a627e26d39216febeb2ae6e2f5e722d64765df56 (patch) | |
| tree | 572dea29d7f99a903790907f84635a56fab600a5 /llvm/lib/CodeGen | |
| parent | 52ce3bbf571ade5db7066671c86730f53972a0c4 (diff) | |
| download | bcm5719-llvm-a627e26d39216febeb2ae6e2f5e722d64765df56.tar.gz bcm5719-llvm-a627e26d39216febeb2ae6e2f5e722d64765df56.zip | |
Enable the tail call optimization when the caller returns undef.
llvm-svn: 88737
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp index f2c623cd616..90fd95eb635 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp @@ -4376,6 +4376,10 @@ isInTailCallPosition(const Instruction *I, Attributes CalleeRetAttr, // what the call's return type is. if (!Ret || Ret->getNumOperands() == 0) return true; + // If the return value is undef, it doesn't matter what the call's + // return type is. + if (isa<UndefValue>(Ret->getOperand(0))) return true; + // Conservatively require the attributes of the call to match those of // the return. Ignore noalias because it doesn't affect the call sequence. unsigned CallerRetAttr = F->getAttributes().getRetAttributes(); |
