InstSimplify: Don't bother if getScalarSizeInBits returns zero

getScalarSizeInBits returns zero when the comparison operands are not
integral.  No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224675 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/InstructionSimplify.cpp b/lib/Analysis/InstructionSimplify.cpp
index 7d8b668..56e7a09 100644 (file)
--- a/lib/Analysis/InstructionSimplify.cpp
+++ b/lib/Analysis/InstructionSimplify.cpp
@@ -3152,14 +3152,15 @@ static Value *SimplifySelectInst(Value *CondVal, Value *TrueVal,
   if (isa<UndefValue>(FalseVal))   // select C, X, undef -> X
     return TrueVal;
 
-  if (const auto *ICI = dyn_cast<ICmpInst>(CondVal)) {
+  const auto *ICI = dyn_cast<ICmpInst>(CondVal);
+  unsigned BitWidth = TrueVal->getType()->getScalarSizeInBits();
+  if (ICI && BitWidth) {
     ICmpInst::Predicate Pred = ICI->getPredicate();
-    APInt MinSignedValue =
-        APInt::getSignBit(TrueVal->getType()->getScalarSizeInBits());
+    APInt MinSignedValue = APInt::getSignBit(BitWidth);
     Value *X;
     const APInt *Y;
-    bool IsBitTest = false;
     bool TrueWhenUnset;
+    bool IsBitTest = false;
     if (ICmpInst::isEquality(Pred) &&
         match(ICI->getOperand(0), m_And(m_Value(X), m_APInt(Y))) &&
         match(ICI->getOperand(1), m_Zero())) {