[Bug middle-end/39157] Code that compiles fine in 1GB of memory with 4.1.2 requires > 20GB in 4.2.* and higher

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39157



--- Comment #25 from Steven Bosscher <steven at gcc dot gnu.org> 2012-11-05 
22:02:18 UTC ---

This problem has been fixed in DF with the DF_RD_PRUNE_DEAD_DEFS flag.

I see no good reason to deprecate the param, though.  For such a huge

loop, any loop invariant code motion is unlikely to be a win.