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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/68855] PAREN_EXPR not "ignored" where possible
Date: Mon, 15 May 2023 06:39:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D68855

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> Maybe:
> (simplify
>  (paren (complex_expr @0 @1))
>  (complex_expr (paren @0) (paren @1))

That makes the tree larger though ...

But yes, if we have (complex (real (complex@0)) (imag (complex@0))
and the inner complex are wrapped that would help.

> (simplify
>  (paren (real_expr @0))
>  (real_expr (paren @0))
> (simplify
>  (paren (imag_expr @0))
>  (real_expr (paren @0))
>=20
> Is enough.

Maybe it's a task for backprop instead?  It at least "feels" similar ...=