[EGCS] Optimizations

[meissner@cygnus.com]

| Marc Lehmann wrote:
| > -fschedule-insns is a *loss* on x86 cpu's!
| 
| care to explain why it is a loss (and most probably also -fschedule-insns2)

The problem is that -fschedule-insns, -funroll-{,all-}loops, and
-fstrength-reduce all tend to work by creating more registers to hold
intermediate results (in compiler speak this is known as register pressure).
Obviously, -fschedule-insns2 doesn't suffer from this problem, since it only
schedules things after register allocation has been done (and thus on a machine
that has plenty of registers has little effect, other than to move spills
around).

--
Michael Meissner, Cygnus Solutions (Massachusetts office)
4th floor, 955 Massachusetts Avenue, Cambridge, MA 02139, USA
meissner@cygnus.com,	617-354-5416 (office),	617-354-7161 (fax)