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FunctionAttrs: Skip it if the effective SCC (ignoring optnone functions) is empty

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Minor optimization but mostly simplifies my debugging so I'm not dealing
with empty SCCNodeSets while investigating issues in this optimization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304597 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2017-06-02 21:24:17 +00:00
parent 465de97122
commit ffc893deb7
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/IPO/FunctionAttrs.cpp
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@ -1188,6 +1188,10 @@ static bool runImpl(CallGraphSCC &SCC, AARGetterT AARGetter) {
SCCNodes.insert(F);
}
// Skip it if the SCC only contains optnone functions.
if (SCCNodes.empty())
return Changed;
Changed |= addArgumentReturnedAttrs(SCCNodes);
Changed |= addReadAttrs(SCCNodes, AARGetter);
Changed |= addArgumentAttrs(SCCNodes);