------- Comment #12 from steven at gcc dot gnu dot org 2007-03-26 22:43 -------
Zdenek, what is the size heuristic for anyway? For powerpc, the current
heuristic tells the compiler not to move any simple moves:
1) An invariant with a gain of 0 will not be moved.
2) gain = comp_cost - size_cost
3) comp_cost of a simple move is 4
4) all powerpc instructions have a size_cost of 4
(At least, the insns that map to a single machine insns have a size_cost of 4.)
So we tell the compiler never to move simple moves for powerpc :-(
--
steven at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.2.0 |4.3.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31360
