[Bug rtl-optimization/59811] [4.8/4.9 Regression] Huge increase in memory usage and compile time in combine

[rguenther at suse dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59811

--- Comment #7 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 31 Jan 2014, jakub at gcc dot gnu.org wrote:

> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59811
> 
> --- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
> Dunno what to limit there though.
> 
> BTW, the 1000 default for sccvn-max-alias-queries-per-access param was some
> carefully chosen value, e.g. does the test that was fixed by the addition of
> the param fail if it is bumped to say 1500 or 2000, or can we just bump
> slightly the default?

It was reasonably chosen - the testcase I added it for still uses
a lot of time in alias-walking (~30% I think which I decided was
reasonable for the testcase).  We sure can slightly bump it,
but that only requires a slightly larger testcase to re-trigger
this bug?