[ValueTracking] Fix an assert from r340480.

We need to allow ConstantExpr Selects in addition to SelectInst.

I'll try to put together a test case, but I wanted to fix the issues being reported.

Fixes PR38677

llvm-svn: 340546

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 322d5c2a876..d2844d80c51 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -2213,7 +2213,9 @@ bool MaskedValueIsZero(const Value *V, const APInt &Mask, unsigned Depth,
 // Returns the input and lower/upper bounds.
 static bool isSignedMinMaxClamp(const Value *Select, const Value *&In,
                                 const APInt *&CLow, const APInt *&CHigh) {
-  assert(isa<SelectInst>(Select) && "Input should be a SelectInst!");
+  assert(isa<Operator>(Select) &&
+         cast<Operator>(Select)->getOpcode() == Instruction::Select &&
+         "Input should be a SelectInst!");
 
   const Value *LHS, *RHS, *LHS2, *RHS2;
   SelectPatternFlavor SPF = matchSelectPattern(Select, LHS, RHS).Flavor;