diff --git a/llvm/include/llvm/IR/InstrTypes.h b/llvm/include/llvm/IR/InstrTypes.h
--- a/llvm/include/llvm/IR/InstrTypes.h
+++ b/llvm/include/llvm/IR/InstrTypes.h
@@ -805,7 +805,9 @@
   void setPredicate(Predicate P) { setSubclassData<PredicateField>(P); }
 
   static bool isFPPredicate(Predicate P) {
-    return P >= FIRST_FCMP_PREDICATE && P <= LAST_FCMP_PREDICATE;
+    assert(FIRST_FCMP_PREDICATE == 0 &&
+           "FIRST_FCMP_PREDICATE is required to be 0");
+    return P <= LAST_FCMP_PREDICATE;
   }
 
   static bool isIntPredicate(Predicate P) {
diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -4567,8 +4567,7 @@
   EVT VT = N->getValueType(0);
   const auto *CD = cast<ConstantSDNode>(N->getOperand(3));
   unsigned CondCode = CD->getZExtValue();
-  if (CondCode < ICmpInst::Predicate::FIRST_ICMP_PREDICATE ||
-      CondCode > ICmpInst::Predicate::LAST_ICMP_PREDICATE)
+  if (!ICmpInst::isIntPredicate(static_cast<ICmpInst::Predicate>(CondCode)))
     return DAG.getUNDEF(VT);
 
   ICmpInst::Predicate IcInput = static_cast<ICmpInst::Predicate>(CondCode);
@@ -4604,10 +4603,8 @@
   const auto *CD = cast<ConstantSDNode>(N->getOperand(3));
 
   unsigned CondCode = CD->getZExtValue();
-  if (CondCode < FCmpInst::Predicate::FIRST_FCMP_PREDICATE ||
-      CondCode > FCmpInst::Predicate::LAST_FCMP_PREDICATE) {
+  if (!FCmpInst::isFPPredicate(static_cast<FCmpInst::Predicate>(CondCode)))
     return DAG.getUNDEF(VT);
-  }
 
   SDValue Src0 = N->getOperand(1);
   SDValue Src1 = N->getOperand(2);