optimization/2001: [3.2/3.3 regression] Inordinately long compile times in reload CSE regs

[Andreas Jaeger]

Steven Bosscher <s.bosscher@student.tudelft.nl> writes:

> http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=2001
>
> Richard's patch really improves things a lot for me:
> http://gcc.gnu.org/ml/gcc-patches/2003-03/msg01478.html
>
> If somebody tries this:  The patch doesn't apply cleanly, the
> first hunk of bb-reorder.c needs to be applied manually.

Can you send a clean patch against 3.3 to save others applying it
manually?


> The numbers:
>
> GCC 3.3, March 12 sources:
>
> at -O0:  TOTAL         :   4.66       0.24       6.14
> at -O2:  TOTAL         : 316.67       1.71     329.12
>
> GCC 3.3, March 16 sources + Richard's patch:
>
> at -O0:  TOTAL         :   3.17       0.15       3.50
> at -O2:  TOTAL         :   5.60       0.17       5.91
>
> The latter is the avarage of three runs because I could hardly
> believe these numbers.
>
> Brad, this is worth a try, don't you think?  :-)

Really impressive,
Andreas
-- 
 Andreas Jaeger
  SuSE Labs aj@suse.de
   private aj@arthur.inka.de
    http://www.suse.de/~aj