[llvm] [LAA] Avoid unprofitable unit-stride versioning (PR #225331)

[Boyao Wang via llvm-commits]

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@@ -3165,7 +3165,8 @@ static Value *getLoopVariantGEPOperand(Value *Ptr, ScalarEvolution *SE,
 
 /// Get the stride of a pointer access in a loop. Looks for symbolic
 /// strides "a[i*stride]". Returns the symbolic stride, or null otherwise.
-static const SCEV *getStrideFromPointer(Value *Ptr, ScalarEvolution *SE, Loop *Lp) {
+static const SCEVUnknown *getStrideFromPointer(Value *Ptr, ScalarEvolution *SE,
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BoyaoWang430 wrote:

Given different reviewers' preference, I'll leave the helper interface unchanged in this PR. The stride-extraction refactoring can be discussed in another PR separately.

https://github.com/llvm/llvm-project/pull/225331