[clang] [llvm] [LV] Mask off possibly aliasing vector lanes (PR #100579)

[Florian Hahn via cfe-commits]

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@@ -9838,16 +9902,33 @@ bool LoopVectorizePass::processLoop(Loop *L) {
   ElementCount UserVF = Hints.getWidth();
   unsigned UserIC = Hints.getInterleave();
 
+  bool AddBranchWeights =
+      hasBranchWeightMD(*L->getLoopLatch()->getTerminator());
+  GeneratedRTChecks Checks(*PSE.getSE(), DT, LI, TTI, F->getDataLayout(),
+                           AddBranchWeights);
+
+  // VPlan needs the aliasing pointers as Values and not SCEVs, so expand them
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fhahn wrote:

If expanded SCEVs are needed in VPlan they should be expanded during VPlan execution using VPExpandSCEVRecioe if possible

https://github.com/llvm/llvm-project/pull/100579