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[Bug tree-optimization/22486] Upcasts are not folded away
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 14 Jul 2005 13:26:18 -0000
- Subject: [Bug tree-optimization/22486] Upcasts are not folded away
- References: <20050714131910.22486.rguenth@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From rguenth at gcc dot gnu dot org 2005-07-14 13:26 -------
Or even simple C:
typedef struct { int i; } Foo;
Foo foo;
Foo *bar(void) { return (Foo *)&foo.i; }
here, in bar() fold (or whoever) should fold (Foo *)&foo.i to &foo.
Because i is at offset zero and foo is of type Foo already.
I'm trying to teach fold_unary to do so, but maybe we won't ever see
the complete expression in fold.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22486