http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58195
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |missed-optimization Status|UNCONFIRMED |NEW Last reconfirmed| |2014-03-11 Component|rtl-optimization |tree-optimization Ever confirmed|0 |1 Known to fail| |4.9.0 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- phiopt should notice <bb 2>: if (input_2(D) != 0) goto <bb 3>; else goto <bb 4>; <bb 3>: iftmp.0_3 = -input_2(D); <bb 4>: # iftmp.0_1 = PHI <iftmp.0_3(3), 0(2)> and value-replace iftmp.0_1 by -input_2(D).