https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77897
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |WAITING Last reconfirmed| |2016-10-10 Ever confirmed|0 |1 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- You need recent enough assembler to support the extra registers available with KNL. What is your binutils version?