[LAA] Fix SCEV mul at different bitwidth

Author: artagnon

llvm/lib/Analysis/LoopAccessAnalysis.cpp

@@ -999,15 +999,15 @@ static void findForkedSCEVs(
       break;
     }
 
+    Type *PtrTy = GEP->getPointerOperandType();
     for (auto [B, O] : zip(BaseScevs, OffsetScevs)) {
       const SCEV *Base = get<0>(B);
       const SCEV *Offset = get<0>(O);
 
       // Scale up the offsets by the size of the type, then add to the bases.
-      const SCEV *Scaled = SE->getTruncateOrSignExtend(
-          SE->getMulExpr(SE->getSizeOfExpr(Offset->getType(), SourceTy),
-                         Offset),
-          Base->getType());
+      const SCEV *Scaled =
+          SE->getMulExpr(SE->getSizeOfExpr(PtrTy, SourceTy),
+                         SE->getTruncateOrSignExtend(Offset, PtrTy));
       ScevList.emplace_back(SE->getAddExpr(Base, Scaled), NeedsFreeze);
     }
     break;