[llvm] [LV] Peek through bitcasts when performing CSE (PR #146856)

[Ramkumar Ramachandra via llvm-commits]

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@@ -2642,8 +2642,8 @@ namespace {
 
 struct CSEDenseMapInfo {
   static bool canHandle(const Instruction *I) {
-    return isa<InsertElementInst>(I) || isa<ExtractElementInst>(I) ||
-           isa<ShuffleVectorInst>(I) || isa<GetElementPtrInst>(I);
+    return isa<InsertElementInst, ExtractElementInst, ShuffleVectorInst,
+               GetElementPtrInst, BitCastInst>(I);
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artagnon wrote:

I did a blame and found that this is really old code, that should probably be moved into VPlanTransforms: if you like, you can try to work on this as a follow-up?

https://github.com/llvm/llvm-project/pull/146856