[llvm] [DA] do not handle array accesses of different offsets (PR #123436)

[Sebastian Pop via llvm-commits]

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@@ -1834,6 +1838,12 @@ PreservedAnalyses LoopInterchangePass::run(LoopNest &LN,
   std::unique_ptr<CacheCost> CC =
       CacheCost::getCacheCost(LN.getOutermostLoop(), AR, DI);
 
+  SCEVUnionPredicate Assumptions = DI.getRuntimeAssumptions();
+  // Early fail when the dependence analysis has runtime assumptions.
+  // FIXME: this could be handled by versioning the loop.
+  if (!Assumptions.isAlwaysTrue())
+    return PreservedAnalyses::all();
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sebpop wrote:

Just above this is a call to CacheCost::getCacheCost that queries all dependences in the loop nest to compute cache reuse patterns.

https://github.com/llvm/llvm-project/pull/123436