Still, this shows that we did have an increase in memory use recently, which may be worth looking into. (And, of course, I'm happily testing Tom's patch as we speak.)
I'd be curious to know the effect of removing the "complexity" field of struct tree_exp. It should be possible to bootstrap C/C++/Java/Fortran with a two line patch removing the field from tree.h, and the only reference to it in tree.c (via the macro TREE_COMPLEXITY).
Paolo
