[Bug middle-end/102566] [i386] GCC should emit LOCK BTS for simple bit-test-and-set operations with std::atomic

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102566

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
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  Attachment #51551|0                           |1
        is obsolete|                            |

--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 51556
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51556&action=edit
The v5 patch

Changes in v5:

1. Check SSA_NAME before SSA_NAME_OCCURS_IN_ABNORMAL_PHI.