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[Bug c++/49279] [4.5/4.6/4.7 Regression] Optimization incorrectly presuming constant variable inside loop in g++ 4.5 and 4.6 with -O2 and -O3 for x86_64 targets
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 6 Jun 2011 14:04:09 +0000
- Subject: [Bug c++/49279] [4.5/4.6/4.7 Regression] Optimization incorrectly presuming constant variable inside loop in g++ 4.5 and 4.6 with -O2 and -O3 for x86_64 targets
- Auto-submitted: auto-generated
- References: <bug-49279-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49279
--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-06-06 14:03:27 UTC ---
# PT = nonlocal escaped
D.7613_101 = MEM[(struct ei_matrix_storage *)this_30(D)];
# PT = nonlocal escaped
D.7616_104 = D.7613_101 + D.7582_90;
# PT = nonlocal escaped { D.7934 } (restr)
SR.167_105 = (const Scalar * restrict) D.7616_104;
# PT = nonlocal escaped
D.7671_127 = MEM[(struct ei_matrix_storage *)this_30(D)];
D.7672_129 = D.7554_68 * 8;
# PT = nonlocal escaped
D.7674_130 = D.7671_127 + D.7672_129;
# PT = nonlocal escaped { D.7936 } (restr)
SR.169_131 = (const Scalar * restrict) D.7674_130;
so while the fix for PR48764 makes this_30 point to a single tag that
would make derived pointers derived it doesn't seem to work for this
case. I have a variant that does.