[llvm] [LAA] Speculate the interleave factor for strided pointer inductions (PR #216036)

[Ramkumar Ramachandra via llvm-commits]

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@@ -172,7 +247,9 @@ const SCEV *llvm::replaceSymbolicStrideSCEV(PredicatedScalarEvolution &PSE,
   assert(isa<SCEVUnknown>(StrideSCEV) && "shouldn't be in map");
 
   ScalarEvolution *SE = PSE.getSE();
-  const SCEV *CT = SE->getOne(StrideSCEV->getType());
+  unsigned StrideValue =
+      getSpeculatedInterleaveStride(PSE.getLoop(), *SE, StrideSCEV).value_or(1);
+  const SCEV *CT = SE->getConstant(StrideSCEV->getType(), StrideValue);
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artagnon wrote:

This is also wasteful. Just store the StrideValue in StridesMap, when speculating strides.

https://github.com/llvm/llvm-project/pull/216036