[Bug middle-end/54896] optimization slowness on large basic blocks

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54896

--- Comment #8 from Steven Bosscher <steven at gcc dot gnu.org> 2013-03-12 18:23:29 UTC ---
With r196576 on x86_64 (gcc17):

at -O1:
 alias stmt walking      :  30.99 (36%) usr
 reload CSE regs         :  18.94 (22%) usr
 CSE                     :  14.94 (17%) usr
 tree DSE                :   9.32 (11%) usr

at -O2:
 alias stmt walking      :  46.65 (30%) usr
 reload CSE regs         :  37.92 (25%) usr
 CSE 2                   :  29.09 (19%) usr
 CSE                     :  15.02 (10%) usr

at -O3:
 tree slp vectorization  : 129.79 (61%) usr
 alias stmt walking      :  46.52 (22%) usr