[LLVMbugs] [Bug 22265] clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Jan 19 23:27:12 PST 2015


Michael Kuperstein <michael.m.kuperstein at intel.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
                 CC|                            |michael.m.kuperstein at intel.
                   |                            |com
         Resolution|---                         |DUPLICATE

--- Comment #3 from Michael Kuperstein <michael.m.kuperstein at intel.com> ---
This looks like a duplicate of PR15941 (albeit with a smaller reproducer).

In David's reproducer, the volatile load gets folded into a CMOV (that came
from the select), and the non-volatile load gets folded into the INC (that came
from the add). 

Because of the volatility of the first load, we have a chain from the CMOV to
the INC, but the CMOV also depends on the result of the INC (through EFLAGS),
and we get a cycle.

*** This bug has been marked as a duplicate of bug 15941 ***

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