[Bug target/58945] Improve atomic_compare_and_swap*_doubleword pattern

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58945

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #31126|0                           |1
        is obsolete|                            |

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 33470
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33470&action=edit
Updated patch to simplify atomic_compare_and_swap<dwi>_doubleword pattern

Patched mainline gcc at revision 215151 still fails to compile the testcase.

Updated patch attached.