[Bug target/96005] New: Add possibility to use newer ptx isa

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96005

            Bug ID: 96005
           Summary: Add possibility to use newer ptx isa
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Currently, we're at ptx isa v3.1:
...
static void
nvptx_file_start (void)
{
  fputs ("// BEGIN PREAMBLE\n", asm_out_file);
  fputs ("\t.version\t3.1\n", asm_out_file);
...

Using a newer isa could give some benefits, f.i. starting PTX ISA 6.3 we have
atom.cas.b16.