Update llvm/lib/Analysis/ValueTracking.cpp

Co-authored-by: Yingwei Zheng <[email protected]>

Author: AlexMaclean

llvm/lib/Analysis/ValueTracking.cpp

@@ -5933,7 +5933,7 @@ void computeKnownFPClass(const Value *V, const APInt &DemandedElts,
     // Transfer information from the sign bit.
     if (Bits.isNonNegative())
       Known.signBitMustBeZero();
-    else if (Bits.One.isSignBitSet())
+    else if (Bits.isNegative())
       Known.signBitMustBeOne();
 
     if (Ty->isIEEE()) {