[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:

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--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 33729
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33729&action=edit
Updated patch to simplify atomic_compare_and_swap<dwi>_doubleword pattern

Patched mainline gcc at revision 216266 still fails to compile the testcase.

Updated patch attached.