[tree-ssa] POOMA compile time / memory requirement comparison

[Steven Bosscher]

On Wednesday 05 May 2004 20:41, Richard Guenther wrote:
> Using the suggested -fno-gcse -fno-cse-follow-jumps -fno-cse-skip-blocks
> -fno-web, -O2 compilation times improve about 8%.  This leaves us with

Why not -fno-delete-null-pointer-checks?  And -fweb is enabled on mainline
and helps tree-ssa iirc, so that should really stay enabled...


> 10% to improve elsewhere (I guess, f.i. preserving the CFG could help,
> as well as removing some first invocations of CSE).

As well as disabling some stuff hidden behind -fexpensive-optimizations,
and investigating if we really need to call delete_trivially_dead_insns
so many times (and iteratively, see cfgcleanup!).  And some other stuff
like addressof, as discussed here some time ago.  There are still a lot
of things we have to try...

Gr.
Steven