[Bug middle-end/45422] [4.6 Regression] compile time increases 3x.

[rguenth at gcc dot gnu.org]

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.