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Don't insert a PHI node to merge "returns" from an inlined function if there
is only a single return from the function! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3878 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -190,7 +190,18 @@ bool InlineFunction(CallInst *CI) {
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RemapInstruction(II, ValueMap);
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}
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if (PHI) RemapInstruction(PHI, ValueMap); // Fix the PHI node also...
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if (PHI) {
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RemapInstruction(PHI, ValueMap); // Fix the PHI node also...
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// Check to see if the PHI node only has one argument. This is a common
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// case resulting from there only being a single return instruction in the
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// function call. Because this is so common, eliminate the PHI node.
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//
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if (PHI->getNumIncomingValues() == 1) {
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PHI->replaceAllUsesWith(PHI->getIncomingValue(0));
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PHI->getParent()->getInstList().erase(PHI);
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}
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}
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// Change the branch that used to go to NewBB to branch to the first basic
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// block of the inlined function.
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