[LoopPred] Stylistic improvement to recently added NE/EQ normalization [NFC]

llvm-svn: 365425

Author: preames

llvm/lib/Transforms/Scalar/LoopPredication.cpp

@@ -647,17 +647,13 @@ Optional<Value *> LoopPredication::widenICmpRangeCheckDecrementingLoop(
 
 static void normalizePredicate(ScalarEvolution *SE, Loop *L,
                                LoopICmp& RC) {
-  // LFTR canonicalizes checks to the ICMP_NE form instead of an ULT/SLT form.
-  // Normalize back to the ULT/SLT form for ease of handling.
-  if (RC.Pred == ICmpInst::ICMP_NE &&
+  // LFTR canonicalizes checks to the ICMP_NE/EQ form; normalize back to the
+  // ULT/UGE form for ease of handling by our caller. 
+  if (ICmpInst::isEquality(RC.Pred) &&
       RC.IV->getStepRecurrence(*SE)->isOne() &&
       SE->isKnownPredicate(ICmpInst::ICMP_ULE, RC.IV->getStart(), RC.Limit))
-    RC.Pred = ICmpInst::ICMP_ULT;
-  if (RC.Pred == ICmpInst::ICMP_EQ &&
-      RC.IV->getStepRecurrence(*SE)->isOne() &&
-      SE->isKnownPredicate(ICmpInst::ICMP_ULE, RC.IV->getStart(), RC.Limit))
-    RC.Pred = ICmpInst::ICMP_UGE;
-
+    RC.Pred = RC.Pred == ICmpInst::ICMP_NE ?
+      ICmpInst::ICMP_ULT : ICmpInst::ICMP_UGE;
 }