[Bug target/83815] New: Enhance addressing for long double on PowerPC with -meabi=ieeelongdouble

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83815

            Bug ID: 83815
           Summary: Enhance addressing for long double on PowerPC with
                    -meabi=ieeelongdouble
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: meissner at gcc dot gnu.org
  Target Milestone: ---

TFmode (and TCmode) in rs6000.c is tuned for IBM extended double.  With the
-mabi=ieeelongdouble option which switches long double to IEEE 128-bit, we need
to go through the various addressing functions in rs6000.c and support the
appropriate reg+reg addressing (and reg+offset in ISA 3.0).