------- Comment #60 from bonzini at gnu dot org 2009-05-06 10:47 -------
Actually those are created by -fmove-loop-invariants. With -O1
-fforward-propagate -fno-move-loop-invariants I get:
4.5 -O1 -ffw-prop -fno-move-loop-inv
LOOP 1 183
INNER LOOP 1.1 116
LOOP 2 25
You should be able to get performance close to 4.2 or better with options "-O1
-fforward-propagate -fno-move-loop-invariants -fschedule-insns2". If you do,
this means two things:
1) That the bug is in the register pressure estimations of
-fno-move-loop-invariants, and merely exposed by the fwprop patch.
2) That maybe you should start from -O2 and go backwards, eliminating
optimizations that do not help you or cause high compilation time, instead of
using -O1.
--
bonzini at gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33928
