[InstSimplify] reduce code duplication for fcmp folds; NFC

llvm-svn: 362904

diff --git a/llvm/lib/Analysis/InstructionSimplify.cpp b/llvm/lib/Analysis/InstructionSimplify.cpp
index ad9d40b..d0b9549 100644 (file)
--- a/llvm/lib/Analysis/InstructionSimplify.cpp
+++ b/llvm/lib/Analysis/InstructionSimplify.cpp
@@ -3477,22 +3477,19 @@ static Value *SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
   if (match(RHS, m_AnyZeroFP())) {
     switch (Pred) {
     case FCmpInst::FCMP_OGE:
-      if ((FMF.noNaNs() || isKnownNeverNaN(LHS, Q.TLI)) &&
-          CannotBeOrderedLessThanZero(LHS, Q.TLI))
-        return getTrue(RetTy);
-      break;
-    case FCmpInst::FCMP_UGE:
-      if (CannotBeOrderedLessThanZero(LHS, Q.TLI))
-        return getTrue(RetTy);
-      break;
     case FCmpInst::FCMP_ULT:
+      // Positive or zero X >= 0.0 --> true
+      // Positive or zero X <  0.0 --> false
       if ((FMF.noNaNs() || isKnownNeverNaN(LHS, Q.TLI)) &&
           CannotBeOrderedLessThanZero(LHS, Q.TLI))
-        return getFalse(RetTy);
+        return Pred == FCmpInst::FCMP_OGE ? getTrue(RetTy) : getFalse(RetTy);
       break;
+    case FCmpInst::FCMP_UGE:
     case FCmpInst::FCMP_OLT:
+      // Positive or zero or nan X >= 0.0 --> true
+      // Positive or zero or nan X <  0.0 --> false
       if (CannotBeOrderedLessThanZero(LHS, Q.TLI))
-        return getFalse(RetTy);
+        return Pred == FCmpInst::FCMP_UGE ? getTrue(RetTy) : getFalse(RetTy);
       break;
     default:
       break;