================
@@ -530,7 +530,7 @@ def CIR_AllocaOp : CIR_Op<"alloca", [
     StrAttr:$name,
     UnitAttr:$init,
     UnitAttr:$constant,
-    ConfinedAttr<OptionalAttr<I64Attr>, [IntMinValue<0>]>:$alignment,
+    ConfinedAttr<DefaultValuedAttr<I64Attr, "0">, [IntMinValue<0>]>:$alignment,
----------------
andykaylor wrote:

Why do we need a default value at all? I thought we agreed that it was just 
going to be a required attribute, in which case the value would always be 
specified when the alloca is created.

https://github.com/llvm/llvm-project/pull/172663
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