From 7abe1944aedf53318ea65e6e1c31d4a5dd82603e Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Wed, 27 Aug 2008 20:55:23 +0000
Subject: [PATCH] Do not apply the transformation if the target does not
 support DestTy natively.

llvm-svn: 55433
---
 lib/Transforms/Scalar/LoopStrengthReduce.cpp | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index 19095a6acff..9c1a95331e3 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -1735,8 +1735,15 @@ void LoopStrengthReduce::OptimizeShadowIV(Loop *L) {
         DestTy = UCast->getDestTy();
       else if (SIToFPInst *SCast = dyn_cast<SIToFPInst>(CandidateUI->User))
         DestTy = SCast->getDestTy();
-    if (!DestTy) continue;
-      
+      if (!DestTy) continue;
+
+      if (TLI) {
+        /* If target does not support DestTy natively then do not apply
+           this transformation. */
+        MVT DVT = TLI->getValueType(DestTy);
+        if (!TLI->isTypeLegal(DVT)) continue;
+      }
+
       PHINode *PH = dyn_cast<PHINode>(ShadowUse->getOperand(0));
       if (!PH) continue;
       if (PH->getNumIncomingValues() != 2) continue;