https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61915
--- Comment #13 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Wilco from comment #9) > I committed a workaround > (http://gcc.gnu.org/ml/gcc-patches/2014-09/msg00362.html) by increasing the > int<->fp move cost. Can you try this and check the issue has indeed gone? > You need -mcpu=cortex-a57. Note when I submitted ThunderX support I used a base of 2 instead of a base of 1 due to 2 being the default and all values are relative to that. This is mentioned in https://gcc.gnu.org/onlinedocs/gccint/Costs.html . In fact a value of 2 means reload will not look at the constraints of a move instruction. So I think the cortex* cpus should also re-base these values based on 2 being gpr-to-gpr value.
