This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
- 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: Thu, 27 Jan 2011 16:17:15 +0000
- Subject: [Bug middle-end/45422] [4.6 Regression] compile time increases 3x.
- Auto-submitted: auto-generated
- References: <bug-45422-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45422
--- Comment #39 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-01-27 16:16:48 UTC ---
The size difference is likely from prefetching, it's 1.5MB vs. 1.1MB without
that (-O3 -fbounds-check -ffast-math -funroll-loops). Prefetching usually
causes another set of (then RTL unrolled) loop copies. See PR44688.