[Bug middle-end/54146] Very slow compile with attribute((flatten))

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54146

--- Comment #47 from Steven Bosscher <steven at gcc dot gnu.org> 2012-08-15 15:07:05 UTC ---
(In reply to comment #46)
> Created attachment 28020 [details]
> Faster rewrite_into_loop_closed_ssa

After this patch, IRA is the only major bottle-neck left, although there are
still a few passes that take more time than I think is reasonable (out-of-SSA
in particular). New top 10 spenders:

 integrated RA           : 227.36 (30%) usr     678602 kB (19%) ggc
 tree SSA incremental    :  66.17 ( 9%) usr     151828 kB ( 4%) ggc
 out of ssa              :  43.76 ( 6%) usr        608 kB ( 0%) ggc
 tree PTA                :  43.06 ( 6%) usr      27466 kB ( 1%) ggc
 df live regs            :  35.03 ( 5%) usr          0 kB ( 0%) ggc
 df live&initialized regs:  34.25 ( 5%) usr          0 kB ( 0%) ggc
 tree SSA rewrite        :  18.37 ( 2%) usr      24888 kB ( 1%) ggc
 remove unused locals    :  17.97 ( 2%) usr          0 kB ( 0%) ggc
 dominance computation   :  15.06 ( 2%) usr          0 kB ( 0%) ggc
 tree CFG cleanup        :  11.79 ( 2%) usr       1123 kB ( 0%) ggc