[llvm] r259625 - LowerBitSets: Don't bother to do any work if the llvm.bitset.test intrinsic is unused.

[Peter Collingbourne via llvm-commits]

Author: pcc
Date: Tue Feb  2 21:48:46 2016
New Revision: 259625

URL: http://llvm.org/viewvc/llvm-project?rev=259625&view=rev
Log:
LowerBitSets: Don't bother to do any work if the llvm.bitset.test intrinsic is unused.

Modified:
    llvm/trunk/lib/Transforms/IPO/LowerBitSets.cpp

Modified: llvm/trunk/lib/Transforms/IPO/LowerBitSets.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/IPO/LowerBitSets.cpp?rev=259625&r1=259624&r2=259625&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/IPO/LowerBitSets.cpp (original)
+++ llvm/trunk/lib/Transforms/IPO/LowerBitSets.cpp Tue Feb  2 21:48:46 2016
@@ -920,7 +920,7 @@ void LowerBitSets::buildBitSetsFromDisjo
 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.