On Wed, 7 Mar 2012, Andrey Belevantsev wrote:
> Hello, > > This PR is again about insns that are recog'ed as >=0 but do not change the > processor state. As explained in > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52203#c8, I've tried experimenting > with an attribute marking those "empty" insns in MD files and asserting that > all other insns do have reservations. As this doesn't seem to be interesting, > I give up with the idea, and the below patch makes sel-sched do exactly what > the Haifa scheduler does, i.e. do not count such insns against issue_rate when > modelling clock cycles. > > Tested on ia64 and x86-64, OK for trunk? No testcase again because of the > amount of flags needed. > > Andrey > > 2012-03-07 Andrey Belevantsev <a...@ispras.ru> > > PR rtl-optimization/52203 > * sel-sched.c (estimate_insn_cost): New parameter pempty. Adjust > all callers to pass NULL except ... > (reset_sched_cycles_in_current_ebb): ... here, save the value > in new variable 'empty'. Increase issue_rate only for > non-empty insns. This is OK. Thanks. -- Alexander
