[LLVMbugs] [Bug 17557] New: Enable subregister liveness for scheduling and register allocation.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17557

            Bug ID: 17557
           Summary: Enable subregister liveness for scheduling and
                    register allocation.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: atrick at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

These are the remaining steps to get Matthias' subregister liveness fully
integrated:
- Fix LiveRegUnits to correctly handle regmasks.
- Benchmark/tune compile time.
- Enable subreg liveness on x86 for testing purposes.
- Use LiveRegUnits to fix ARM VMOV widening.
- Fix the scheduler's DAG builder to use bundler iterator, not operand index.
- Discard the master live range after coalescing so that LiveInterval updates
don't need to preserve it when we reorder subregister defs.
- Enable subreg scheduling on all targets that enable MI scheduler.

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