[llvm] 9e72d3e - [ValueTracking] Use KnownBits::countMaxLeadingZeros/countMaxTrailingZeros to make code more readable. NFC

[Craig Topper via llvm-commits]

Author: Craig Topper
Date: 2020-10-11T14:26:18-07:00
New Revision: 9e72d3eaf38f217698f72cb8fdc969a6e72dad3a

URL: https://github.com/llvm/llvm-project/commit/9e72d3eaf38f217698f72cb8fdc969a6e72dad3a
DIFF: https://github.com/llvm/llvm-project/commit/9e72d3eaf38f217698f72cb8fdc969a6e72dad3a.diff

LOG: [ValueTracking] Use KnownBits::countMaxLeadingZeros/countMaxTrailingZeros to make code more readable. NFC

Added: 
    

Modified: 
    llvm/lib/Analysis/ValueTracking.cpp

Removed: 
    


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diff  --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index f84531fee2fa..979d25b554a9 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -1585,7 +1585,7 @@ static void computeKnownBitsFromOperator(const Operator *I,
       case Intrinsic::ctlz: {
         computeKnownBits(I->getOperand(0), Known2, Depth + 1, Q);
         // If we have a known 1, its position is our upper bound.
-        unsigned PossibleLZ = Known2.One.countLeadingZeros();
+        unsigned PossibleLZ = Known2.countMaxLeadingZeros();
         // If this call is undefined for 0, the result will be less than 2^n.
         if (II->getArgOperand(1) == ConstantInt::getTrue(II->getContext()))
           PossibleLZ = std::min(PossibleLZ, BitWidth - 1);
@@ -1596,7 +1596,7 @@ static void computeKnownBitsFromOperator(const Operator *I,
       case Intrinsic::cttz: {
         computeKnownBits(I->getOperand(0), Known2, Depth + 1, Q);
         // If we have a known 1, its position is our upper bound.
-        unsigned PossibleTZ = Known2.One.countTrailingZeros();
+        unsigned PossibleTZ = Known2.countMaxTrailingZeros();
         // If this call is undefined for 0, the result will be less than 2^n.
         if (II->getArgOperand(1) == ConstantInt::getTrue(II->getContext()))
           PossibleTZ = std::min(PossibleTZ, BitWidth - 1);