[llvm] [LAA/SLP] Don't truncate APInt in getPointersDiff (PR #139941)

[Reid Kleckner via llvm-commits]

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@@ -5894,7 +5899,7 @@ static bool isMaskedLoadCompress(
     VectorType *&LoadVecTy) {
   InterleaveFactor = 0;
   Type *ScalarTy = VL.front()->getType();
-  const unsigned Sz = VL.size();
+  const uint64_t Sz = VL.size();
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rnk wrote:

supernit: size_t

https://github.com/llvm/llvm-project/pull/139941