[llvm] 929a127 - [ValueTracking] computeKnownBitsFromShiftOperator - consistently use Known2 for the shifted value. NFCI.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2020-11-10T17:03:17Z
New Revision: 929a127932b4ad39551ea844880217a5f12e2034

URL: https://github.com/llvm/llvm-project/commit/929a127932b4ad39551ea844880217a5f12e2034
DIFF: https://github.com/llvm/llvm-project/commit/929a127932b4ad39551ea844880217a5f12e2034.diff

LOG: [ValueTracking] computeKnownBitsFromShiftOperator - consistently use Known2 for the shifted value. NFCI.

Minor cleanup as part of getting D90479 moving again.

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 db591ce67709..ce9174bbcdcf 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -995,9 +995,9 @@ static void computeKnownBitsFromShiftOperator(
   if (Known.isConstant()) {
     unsigned ShiftAmt = Known.getConstant().getLimitedValue(BitWidth - 1);
 
-    computeKnownBits(I->getOperand(0), DemandedElts, Known, Depth + 1, Q);
-    Known.Zero = KZF(Known.Zero, ShiftAmt);
-    Known.One  = KOF(Known.One, ShiftAmt);
+    computeKnownBits(I->getOperand(0), DemandedElts, Known2, Depth + 1, Q);
+    Known.Zero = KZF(Known2.Zero, ShiftAmt);
+    Known.One = KOF(Known2.One, ShiftAmt);
     // If the known bits conflict, this must be an overflowing left shift, so
     // the shift result is poison. We can return anything we want. Choose 0 for
     // the best folding opportunity.