[ValueTracking] Use BitWidth local variable instead of re-reading it from KnownZero...

This is a pre-commit for a patch that I'm working on to merge KnownZero/KnownOne into a KnownBits struct which would have had to touch this line.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301323 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp
index e2ffa440c90d2df69cea59055feacbd529902877..ecb169cb0db6ff2f688d6a5d3ebcb712f6329c80 100644 (file)
--- a/lib/Analysis/ValueTracking.cpp
+++ b/lib/Analysis/ValueTracking.cpp
@@ -1532,7 +1532,7 @@ void computeKnownBits(const Value *V, APInt &KnownZero, APInt &KnownOne,
     // We know that CDS must be a vector of integers. Take the intersection of
     // each element.
     KnownZero.setAllBits(); KnownOne.setAllBits();
-    APInt Elt(KnownZero.getBitWidth(), 0);
+    APInt Elt(BitWidth, 0);
     for (unsigned i = 0, e = CDS->getNumElements(); i != e; ++i) {
       Elt = CDS->getElementAsInteger(i);
       KnownZero &= ~Elt;