http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54116
--- Comment #2 from Ondrej Bilka <neleai at seznam dot cz> 2012-07-29 10:30:46 UTC --- On Sun, Jul 29, 2012 at 10:13:41AM +0000, pinskia at gcc dot gnu.org wrote: > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54116 > > --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-07-29 > 10:13:41 UTC --- > The tree level looks correct: > <bb 4>: > # ivtmp.23_69 = PHI <ivtmp.23_68(5), ivtmp.23_66(3)> > D.1771_65 = (void *) ivtmp.23_69; > D.1717_6 = MEM[base: D.1771_65, offset: 0B]; > D.1722_10 = MEM[base: D.1771_65, offset: 4B]; > D.1723_11 = D.1722_10 | D.1717_6; > D.1727_15 = MEM[base: D.1771_65, offset: 8B]; > D.1731_19 = MEM[base: D.1771_65, offset: 12B]; > D.1732_20 = D.1731_19 | D.1727_15; > D.1733_21 = D.1732_20 | D.1723_11; > ivtmp.23_68 = ivtmp.23_69 + 16; > if (D.1733_21 != 0) > goto <bb 6>; > else > goto <bb 5>; > > <bb 5>: > goto <bb 4>; > > <bb 6>: > # D.1723_22 = PHI <D.1723_11(4), D.1723_36(2)> > # D.1732_23 = PHI <D.1732_20(4), D.1732_45(2)> > D.1737_25 = D.1723_22 * D.1732_23; > return D.1737_25; > > > --- CUT ---- > Are you trying to say GCC should copy the loop header in this case? > Or keeping around x[i]|x[i+1] and x[i+2]|x[i+3] result increases register > pressure and exposes issues with 2-operand machines in some cases? Increases register pressure. > > -- > Configure bugmail: http://gcc.gnu.org/bugzilla/userprefs.cgi?tab=email > ------- You are receiving this mail because: ------- > You reported the bug.
