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LowerBitSets: Don't bother to do any work if the llvm.bitset.test intrinsic is unused.

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llvm-svn: 259625
This commit is contained in:
Peter Collingbourne 2016-02-03 03:48:46 +00:00
parent 6410c66883
commit 7f6faddfa9
1 changed files with 1 additions and 1 deletions
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2
lib/Transforms/IPO/LowerBitSets.cpp
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@ -920,7 +920,7 @@ void LowerBitSets::buildBitSetsFromDisjointSet(
bool LowerBitSets::buildBitSets() {
Function *BitSetTestFunc =
M->getFunction(Intrinsic::getName(Intrinsic::bitset_test));
if (!BitSetTestFunc)
if (!BitSetTestFunc || BitSetTestFunc->use_empty())
return false;
// Equivalence class set containing bitsets and the globals they reference.