[llvm-bugs] [Bug 28694] New: WQM handling misses VCC dependencies

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28694

            Bug ID: 28694
           Summary: WQM handling misses VCC dependencies
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AMDGPU
          Assignee: unassignedbugs at nondot.org
          Reporter: nhaehnle at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Sometimes, uniform branch conditions are lowered to VALU comparisons, e.g.

v_cmp_lt vcc, N, v0
s_cbranch_vccnz BB

The fact that v0 can require WQM conditions isn't picked up, which can lead to
GPU hangs.

Candidate fix is at https://reviews.llvm.org/D22673

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