[clang] [llvm] [SROA] Vector promote some memsets (PR #133301)

[Nikita Popov via cfe-commits]

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@@ -1170,10 +1204,17 @@ class AllocaSlices::SliceBuilder : public PtrUseVisitor<SliceBuilder> {
     if (!IsOffsetKnown)
       return PI.setAborted(&II);
 
+    bool Splittable;
+
+    if (getVectorTypeFor(II, DL))
+      Splittable = isSplittableMemOp(AS.AI.getAllocatedType(), II.isVolatile());
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nikic wrote:

I don't think checking AI.getAllocatedType() here makes a lot of sense, seeing as how the memset may only be operating on part of it.

https://github.com/llvm/llvm-project/pull/133301