[Bug tree-optimization/61515] Extremely long compile time for generated code

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61515

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
4.8 and 4.9 at -O0 take ~32s and ~2.4GB of ram (and IRA taking 28% of the time)
4.8 at -O1 takes ~15min and ~5.5GB of ram (RTL loop invariant motion taking 80%
of the time - ugh)
4.9 at -O1 takes ~5min and ~2GB of ram (30% compile time in SSA incremental,
27% in DF)

Now -O[s2] will enable passes that are not really "tamed" and may show
quadratic behavior (PRE and VRP for example, off the top of my head).  You're
supposed to drop to -O1 whenever you hit this kind of bug ...

Building release checking trunk now.