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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/112296] __builtin_constant_p doesn't
 propagate through member functions
Date: Tue, 31 Oct 2023 14:13:53 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112296

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Some history shows r0-31250-gb0b3afb2f34492 splitting this to the folding
code from RTL expansion of __builtin_constant_p where it previously was.
Even before r0-17364-gcff48d8f76463f we were simply doing

@@ -8566,10 +8579,34 @@ expand_builtin (exp, target, subtarget, mode, ignor=
e)
          tree arg =3D TREE_VALUE (arglist);

          STRIP_NOPS (arg);
-         return (TREE_CODE_CLASS (TREE_CODE (arg)) =3D=3D 'c'
-                 || (TREE_CODE (arg) =3D=3D ADDR_EXPR
-                     && TREE_CODE (TREE_OPERAND (arg, 0)) =3D=3D STRING_CS=
T)
-                 ? const1_rtx : const0_rtx);

and that dates back to r0-384-gbbf6f052d786c2, "Initial revision" of expr.c
from Kenner :/=