[llvm] r278607 - [IRCE] Use dyn_cast instead of explicit isa/cast; NFC

[Sanjoy Das via llvm-commits]

Author: sanjoy
Date: Sat Aug 13 17:00:12 2016
New Revision: 278607

URL: http://llvm.org/viewvc/llvm-project?rev=278607&view=rev
Log:
[IRCE] Use dyn_cast instead of explicit isa/cast; NFC

Modified:
    llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp?rev=278607&r1=278606&r2=278607&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp Sat Aug 13 17:00:12 2016
@@ -930,10 +930,10 @@ void LoopConstrainer::cloneLoop(LoopCons
         continue; // not an exit block
 
       for (Instruction &I : *SBB) {
-        if (!isa<PHINode>(&I))
+        auto *PN = dyn_cast<PHINode>(&I);
+        if (!PN)
           break;
 
-        PHINode *PN = cast<PHINode>(&I);
         Value *OldIncoming = PN->getIncomingValueForBlock(OriginalBB);
         PN->addIncoming(GetClonedValue(OldIncoming), ClonedBB);
       }
@@ -1066,11 +1066,10 @@ LoopConstrainer::RewrittenRangeInfo Loop
   // each of the PHI nodes in the loop header.  This feeds into the initial
   // value of the same PHI nodes if/when we continue execution.
   for (Instruction &I : *LS.Header) {
-    if (!isa<PHINode>(&I))
+    auto *PN = dyn_cast<PHINode>(&I);
+    if (!PN)
       break;
 
-    PHINode *PN = cast<PHINode>(&I);
-
     PHINode *NewPHI = PHINode::Create(PN->getType(), 2, PN->getName() + ".copy",
                                       BranchToContinuation);
 
@@ -1103,11 +1102,10 @@ void LoopConstrainer::rewriteIncomingVal
 
   unsigned PHIIndex = 0;
   for (Instruction &I : *LS.Header) {
-    if (!isa<PHINode>(&I))
+    auto *PN = dyn_cast<PHINode>(&I);
+    if (!PN)
       break;
 
-    PHINode *PN = cast<PHINode>(&I);
-
     for (unsigned i = 0, e = PN->getNumIncomingValues(); i < e; ++i)
       if (PN->getIncomingBlock(i) == ContinuationBlock)
         PN->setIncomingValue(i, RRI.PHIValuesAtPseudoExit[PHIIndex++]);
@@ -1124,10 +1122,10 @@ BasicBlock *LoopConstrainer::createPrehe
   BranchInst::Create(LS.Header, Preheader);
 
   for (Instruction &I : *LS.Header) {
-    if (!isa<PHINode>(&I))
+    auto *PN = dyn_cast<PHINode>(&I);
+    if (!PN)
       break;
 
-    PHINode *PN = cast<PHINode>(&I);
     for (unsigned i = 0, e = PN->getNumIncomingValues(); i < e; ++i)
       replacePHIBlock(PN, OldPreheader, Preheader);
   }