This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug target/15184] [4.6/4.7/4.8 Regression] Direct access to byte inside word not working with -march=pentiumpro
- From: "steven at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 09 Nov 2012 22:32:30 +0000
- Subject: [Bug target/15184] [4.6/4.7/4.8 Regression] Direct access to byte inside word not working with -march=pentiumpro
- Auto-submitted: auto-generated
- References: <bug-15184-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15184
Steven Bosscher <steven at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P5 |P3
Last reconfirmed|2005-05-28 18:17:13 |2012-11-09 18:17:13
CC| |steven at gcc dot gnu.org
Known to fail| |
--- Comment #20 from Steven Bosscher <steven at gcc dot gnu.org> 2012-11-09 22:32:30 UTC ---
(In reply to comment #13)
This is indeed pretty bad. Works with GCC 4.1, fails with GCC 4.3 and
with current top-of-trunk, and for all i686 variants including relatively
new CPUs based on the P6 micro-architecture, like core2 and atom.
I disagree with comment #10, and I don't think this problem is minor. The
code of the test case is common idiom that should be optimized properly.
Please can the RMs have a new look at this.