[llvm] [GVN] Look through select/phi when determining underlying object (PR #99509)

[Thorsten Schütt via llvm-commits]

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@@ -736,6 +736,10 @@ inline Value *getUnderlyingObject(Value *V, unsigned MaxLookup = 6) {
   return const_cast<Value *>(getUnderlyingObject(VConst, MaxLookup));
 }
 
+/// Like getUnderlyingObject(), but will try harder to find a single underlying
+/// object. In particular, this function also looks through selects and phis.
+const Value *getUnderlyingObjectAggressive(const Value *V);
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tschuett wrote:

Could you still expose a parameter to control the aggressiveness? Aggressive without a parameter is kind of scary. E.g. the size of the visited set?

https://github.com/llvm/llvm-project/pull/99509