[llvm] r300558 - LoopRerollPass: Prefer Value::hasOneUse() over Value::getNumUses(). NFC.

[Zvi Rackover via llvm-commits]

Author: zvi
Date: Tue Apr 18 09:55:43 2017
New Revision: 300558

URL: http://llvm.org/viewvc/llvm-project?rev=300558&view=rev
Log:
LoopRerollPass: Prefer Value::hasOneUse() over Value::getNumUses(). NFC.

getNumUses() can be more expensive as it iterates over all list's elements.

Modified:
    llvm/trunk/lib/Transforms/Scalar/LoopRerollPass.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/LoopRerollPass.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopRerollPass.cpp?rev=300558&r1=300557&r2=300558&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopRerollPass.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopRerollPass.cpp Tue Apr 18 09:55:43 2017
@@ -557,7 +557,7 @@ bool LoopReroll::isLoopControlIV(Loop *L
             Instruction *UUser = dyn_cast<Instruction>(UU);
             // Skip SExt if we are extending an nsw value
             // TODO: Allow ZExt too
-            if (BO->hasNoSignedWrap() && UUser && UUser->getNumUses() == 1 &&
+            if (BO->hasNoSignedWrap() && UUser && UUser->hasOneUse() &&
                 isa<SExtInst>(UUser))
               UUser = dyn_cast<Instruction>(*(UUser->user_begin()));
             if (!isCompareUsedByBranch(UUser))