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: [email protected]
Reporter: [email protected]
CC: [email protected]
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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