Re: alias time explosion

[Maxim Kuvyrkov <mkuvyrkov at ispras dot ru>]

Daniel Berlin wrote:

...

> If i don't turn off scheduling entirely, this testcase now takes >10
> minutes to compile (I gave up after that).
>
> With scheduling turned off, it takes 315 seconds, checking enabled.
>
> It looks like the scheduler is now trying to schedule some single region
> with 51,000 instructions in it.
>
> Everytime i broke into the debugger, it was busy in ready_sort re-doing
> qsort on the ready-list (which probably had a ton of instructions), over
> and over and over again.
>
>
> I imagine the 51k instructions comes from the recent scheduling changes.
> Maxim, can you please take the testcase Andrew attached earlier in the
> thread, and make it so the scheduler can deal with it in a reasonable
> amount of time again?  It used to take <20 seconds.

I've checked the trunk and everything appears ok to me.  Both the trunk 
and the trunk with my patches reverted compile the testcase in 5m30s 
(they were configured with CFLAGS=-g).  My best guess where the >10 
minutes came from is that you tried to compile the testcase with the 
compiler built with profile information - in this case the compilation 
will last for ~15 minutes.

--
Maxim