On Wed, Apr 17, 2013 at 10:14:53AM -0400, Vladimir Makarov wrote: > Mike, thanks for the patch and all the SPEC2006 data (which are > very useful as I have no access to power machine which can be used > for benchmarking). I guess that may be some benchmark scores are > lower because of LRA lacks some micro-optimizations which reload > implements through many power hooks (e.g. LRA does not use push > reload). Although sometimes it is not a bad thing (e.g. LRA does > not use SECONDARY_MEMORY_NEEDED_RTX which permits to reuse the > stack slots for other useful things).
SECONDARY_MEMORY_NEEDED_RTX is needed for SDmode on machines before the power7, where we need a larger stack slot to hold spilled SDmode values (power6 did not have the LFIWZX instruction that is needed to load SDmode values into floating point registers). > In general I got impression that power7 is the most difficult port > for LRA. If we manage to port it, LRA ports for other targets will > be easier. I dunno, has LRA been ported to the SH yet? > I also reproduced bootstrap failure --with-cpu=power7 and I am going > to work on this and after that on SPEC2006 you wrote about. Ok. -- Michael Meissner, IBM IBM, M/S 2506R, 550 King Street, Littleton, MA 01460, USA email: meiss...@linux.vnet.ibm.com, phone: +1 (978) 899-4797
