[LLVMbugs] [Bug 20376] may fail to recognize potential EFLAGS clobbers for compare-exchange operations

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20376

Tim Northover <t.p.northover at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #9 from Tim Northover <t.p.northover at gmail.com> ---
OK, the change had no effect on the test-suite, and seems to pass all the spot
checks I've performed (eliding the COPY where possible, emitting it where
necessary), so I've committed it as r220529.

I think even if we want to improve cmpxchg CodeGen more, or take a completely
different approach to the problem we'd want ScheduleDAG to represent that
EFLAGS dependency properly.

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