[Bug target/12225] New: Itanium ILP32 mode uses wrong long double size/alignment

[mmitchel at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12225

           Summary: Itanium ILP32 mode uses wrong long double size/alignment
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mmitchel at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org,rth at redhat dot com
GCC target triplet: ia64-*-*

The Itanium psABI says that in ILP32 mode long double should have size 12 and
alignment 4.  However, GCC uses the same size/alignment that it uses in LP64 mode.

Only HP-UX presently provides runtime support for ILP32 mode, so there is no
harm in changing the current behavior on other systems.

On HP-UX, long double should have size 16 and alignment 8 in IPL32 mode; HP-UX
uses IEEE Quad for long double, not IEEE Double-Extended.