https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78200
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target| |x86_64-*-* Status|UNCONFIRMED |WAITING Version|tree-ssa |7.0 Keywords| |missed-optimization Last reconfirmed| |2016-11-04 Component|tree-optimization |rtl-optimization CC|richard.guenther at gmail dot com |rguenth at gcc dot gnu.org Ever confirmed|0 |1 Summary|[7 regression]: 429.mcf of |[7 Regression] 429.mcf of |cpu2006 regresses in GCC |cpu2006 regresses in GCC |trunk for avx2 target. |trunk for avx2 target. Target Milestone|--- |7.0 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- The issue is the missed cmp-and-branch fusion which you should a) enable in the first place like via -mtune=bdver4 b) is appearantly made impossible/hard by changes in original RTL expansion with regard to a complex condition. Please attach a testcase.