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[Bug middle-end/25186] (short)(((int)short_var) <<1) should be folded so that the shift is done in the short type
- 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: 1 Dec 2005 11:01:31 -0000
- Subject: [Bug middle-end/25186] (short)(((int)short_var) <<1) should be folded so that the shift is done in the short type
- References: <bug-25186-6528@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from rguenth at gcc dot gnu dot org 2005-12-01 11:01 -------
Doh. The C frontend _does_ the promotion (in the unsigned case):
(intD.0) *aD.1296 << 1
just convert.c:convert_to_integer "folds" it to a shift on unsigned short
again.
This transformation should be moved to fold instead.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25186