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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/115641] [11/12/13/14/15 Regression] GCC crashes on
 function has attribute `__attribute__((const))`
Date: Tue, 25 Jun 2024 19:58:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115641

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
It's the

--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -4447,8 +4447,7 @@ simple_operand_p_2 (tree exp)
 {
   enum tree_code code;

-  if (TREE_SIDE_EFFECTS (exp)
-      || tree_could_trap_p (exp))
+  if (TREE_SIDE_EFFECTS (exp) || generic_expr_could_trap_p (exp))
     return false;

   while (CONVERT_EXPR_P (exp))

change.  simple_condition_p gets

((short unsigned int) BIT_FIELD_REF <MEM <struct T> [(void *)&f ()], 16, 0>=
 &
65535) !=3D 513

and generic_expr_could_trap_p recurses down to tree_could_trap_p getting

MEM <struct T> [(void *)&f ()]

where we get the base which is "f ()" but DECL_SIZE_UNIT crashes on that.=