[Bug fortran/77897] New: Compile error with KNL & -O3 for GTC code

[longb at cray dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77897

            Bug ID: 77897
           Summary: Compile error with KNL & -O3 for GTC code
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: longb at cray dot com
  Target Milestone: ---

Created attachment 39767
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39767&action=edit
Source files module.F90 and pushe.f90 (in bug.tar)

As a basic sanity check:

> ftn -c module.F90
> ftn -c pushe.f90 
> module swap PrgEnv-cray PrgEnv-gnu
> ftn -c module.F90
> ftn -c pushe.f90 
> ftn -c -O3 module.F90
> ftn -c -O3 pushe.f90 
> 
> module list
Currently Loaded Modulefiles:
...
 12) gcc/6.2.0
 13) craype-network-aries
 14) craype-sandybridge


Now checking KNL target:

> module swap craype-sandybridge craype-mic-knl
> ftn -c -O3 module.F90
> ftn -c -O3 pushe.f90 
/tmp/cc4TRnzd.s: Assembler messages:
/tmp/cc4TRnzd.s:61: Error: bad register name `%xmm24'
/tmp/cc4TRnzd.s:63: Error: bad register name `%xmm24'
/tmp/cc4TRnzd.s:65: Error: bad register name `%xmm16'
...
[many more lines of messages]