================
@@ -3157,7 +3177,15 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl
GD, unsigned BuiltinID,
if (Result->getType() != ResultType)
----------------
overmighty wrote:
Since in the additions below I check if the argument itself is zero instead of
checking the result of `ctlz`, I don't see why the `ctlz` result for zero being
undefined would be a problem.
https://github.com/llvm/llvm-project/pull/83431
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