[llvm] [LoopVectorize] LLVM fails to vectorise loops with multi-bool varables (PR #89226)

[Sam Tebbs via llvm-commits]

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@@ -635,14 +639,59 @@ RecurrenceDescriptor::isAnyOfPattern(Loop *Loop, PHINode *OrigPhi,
       return InstDesc(Select, Prev.getRecKind());
   }
 
+  SelectInst *SI = dyn_cast<SelectInst>(I);
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SamTebbs33 wrote:

I think this change could do with some comments.

https://github.com/llvm/llvm-project/pull/89226