This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug rtl-optimization/42589] bswap optimization does not work for 32bit (but for 64bit) on 64bit registers
- 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: 3 Jan 2010 11:34:15 -0000
- Subject: [Bug rtl-optimization/42589] bswap optimization does not work for 32bit (but for 64bit) on 64bit registers
- References: <bug-42589-7834@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #1 from rguenth at gcc dot gnu dot org 2010-01-03 11:34 -------
Because with 32bit we do not have a 64bit bswap instruction and tmp is 64bit.
What would you expect here?
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Keywords| |missed-optimization
Summary|bswap optimization does not |bswap optimization does not
|work for 32bit (but for |work for 32bit (but for
|64bit) |64bit) on 64bit registers
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42589