Compilation time has more than doubled on some Polyhedron tests

[Tobias Schlüter]

Richard Guenther wrote:
> I guess the fix for PR tree-optimization/22555 could make some difference
> if fortran uses a lot of structures with embedded arrays.  Basically this
> enables decomposing these structures for aliasing purposes and should
> generate better code.

It is perhaps noteworthy that the build times for the base run of Diego's
SPECFP tester have increased by approx. twenty percent, with no visible gain
in execution speed, between Jan 5th and Jan 6th, see
<http://people.redhat.com/dnovillo/spec2000.i686/gcc/global-build-secs_elapsed.html>
and
<http://people.redhat.com/dnovillo/spec2000.i686/gcc/global-run-secs_elapsed.html>

- Tobi