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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 | ed9bab3b4da0a5c5581fdd477c19c02420dd2fc7 (patch) | |
| tree | 0960e1ea7081395a015e3ef090e9cef1651d48ab /lib | |
| parent | 0cd22dd7383111192571884eb941ac2ccb668025 (diff) | |
| download | external_llvm-ed9bab3b4da0a5c5581fdd477c19c02420dd2fc7.zip external_llvm-ed9bab3b4da0a5c5581fdd477c19c02420dd2fc7.tar.gz external_llvm-ed9bab3b4da0a5c5581fdd477c19c02420dd2fc7.tar.bz2 | |
Enable the tail call optimization when the caller returns undef.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88737 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp index f2c623c..90fd95e 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp +++ b/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(); |