[Bug c++/71245] std::atomic<double> load/store bounces the data to the stack using fild/fistp

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71245

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2016-05-27
           Assignee|unassigned at gcc dot gnu.org      |ubizjak at gmail dot com
     Ever confirmed|0                           |1

--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 38584
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38584&action=edit
Prototype patch

Attached patch implements a couple of peephole2 patterns that remove unneeded
instructions.