[llvm] r360031 - [LoadStoreVectorizer] vectorizeStoreChain - ensure we find a store type.

[Simon Pilgrim via llvm-commits]

Author: rksimon
Date: Mon May  6 03:25:11 2019
New Revision: 360031

URL: http://llvm.org/viewvc/llvm-project?rev=360031&view=rev
Log:
[LoadStoreVectorizer] vectorizeStoreChain - ensure we find a store type.

Properly initialize store type to null then ensure we find a real store type in the chain.

Fixes scan-build null dereference warning and makes the code clearer.

Modified:
    llvm/trunk/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp

Modified: llvm/trunk/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp?rev=360031&r1=360030&r2=360031&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp (original)
+++ llvm/trunk/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp Mon May  6 03:25:11 2019
@@ -926,7 +926,7 @@ bool Vectorizer::vectorizeStoreChain(
   StoreInst *S0 = cast<StoreInst>(Chain[0]);
 
   // If the vector has an int element, default to int for the whole store.
-  Type *StoreTy;
+  Type *StoreTy = nullptr;
   for (Instruction *I : Chain) {
     StoreTy = cast<StoreInst>(I)->getValueOperand()->getType();
     if (StoreTy->isIntOrIntVectorTy())
@@ -938,6 +938,7 @@ bool Vectorizer::vectorizeStoreChain(
       break;
     }
   }
+  assert(StoreTy && "Failed to find store type");
 
   unsigned Sz = DL.getTypeSizeInBits(StoreTy);
   unsigned AS = S0->getPointerAddressSpace();