[Bug ada/65476] New: Long_Float array does not byte swap correctly when set to Scalar_Storage_Order with High Order First

[daniel.merrill at psware dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65476

            Bug ID: 65476
           Summary: Long_Float array does not byte swap correctly when set
                    to Scalar_Storage_Order with High Order First
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: daniel.merrill at psware dot com
                CC: ebotcazou at gcc dot gnu.org

Created attachment 35067
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35067&action=edit
code to reproduce the issue.

When an array of Long_Floats is set to a scalar_storage_order of
High_Order_First, only the two 32 bit words that make up the 64 bit value are
swapped with each other but the bytes under those words are not swapped
properly. Attached is a simple program that reproduces the behavior. If you
examine the stored values you could get the right value by performing a byte
swap on the underlying 32 bit value.