[llvm] [LAA] Be more precise on different store sizes (PR #122318)

[Florian Hahn via llvm-commits]

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@@ -2079,12 +2082,27 @@ MemoryDepChecker::getDependenceDistanceStrideAndSize(
   if (StrideAScaled == StrideBScaled)
     CommonStride = StrideAScaled;
 
+  // If the distance is a SCEVCouldNotCompute, fail immediately.
+  if (isa<SCEVCouldNotCompute>(Dist)) {
+    LLVM_DEBUG(dbgs() << "LAA: Dependence because of uncomputable distance.\n");
+    return Dependence::Unknown;
+  }
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fhahn wrote:

Is this directly related to support different sizes?

https://github.com/llvm/llvm-project/pull/122318