diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index efe8850..8571dc2 100644
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -3620,8 +3620,11 @@
         if (CannotBeOrderedLessThanZero(LHS, Q.TLI))
           return getTrue(RetTy);
         break;
+      case FCmpInst::FCMP_ULT:
+        if (FMF.noNaNs() && CannotBeOrderedLessThanZero(LHS, Q.TLI))
+          return getFalse(RetTy);
+        break;
       case FCmpInst::FCMP_OLT:
-        // X < 0
         if (CannotBeOrderedLessThanZero(LHS, Q.TLI))
           return getFalse(RetTy);
         break;