[llvm] r331948 - [InstCombine] Reorder an if condition to put a cheap check in front of a computeKnownBits call. NFC

[Craig Topper via llvm-commits]

Author: ctopper
Date: Wed May  9 17:53:25 2018
New Revision: 331948

URL: http://llvm.org/viewvc/llvm-project?rev=331948&view=rev
Log:
[InstCombine] Reorder an if condition to put a cheap check in front of a computeKnownBits call. NFC

Modified:
    llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp

Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp?rev=331948&r1=331947&r2=331948&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineCasts.cpp Wed May  9 17:53:25 2018
@@ -393,9 +393,9 @@ static bool canEvaluateTruncated(Value *
     if (match(I->getOperand(1), m_APInt(Amt))) {
       uint32_t OrigBitWidth = OrigTy->getScalarSizeInBits();
       uint32_t BitWidth = Ty->getScalarSizeInBits();
-      if (IC.MaskedValueIsZero(I->getOperand(0),
-            APInt::getBitsSetFrom(OrigBitWidth, BitWidth), 0, CxtI) &&
-          Amt->getLimitedValue(BitWidth) < BitWidth) {
+      if (Amt->getLimitedValue(BitWidth) < BitWidth &&
+          IC.MaskedValueIsZero(I->getOperand(0),
+            APInt::getBitsSetFrom(OrigBitWidth, BitWidth), 0, CxtI)) {
         return canEvaluateTruncated(I->getOperand(0), Ty, IC, CxtI);
       }
     }