[Bug target/59909] Quad memory bootstrap issues on little endian powerpc64 power8 systems

[meissner at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59909

--- Comment #1 from Michael Meissner <meissner at gcc dot gnu.org> ---
Created attachment 31922
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31922&action=edit
Proposed patch to fix the problem

Split quad-memory support into two options, -mquad-memory for non-atomic
load/stores, -mquad-memory-atomic for atomic load/stores.  Don't allow
non-atomic quad load/stores in little endian mode.  Swap double words in little
endian mode for atomic loads/stores.