diff options
| author | Andrew Trick <atrick@apple.com> | 2013-04-24 15:54:43 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2013-04-24 15:54:43 +0000 |
| commit | e38afe1e335084134f7830ba6f2208e2ddde59b4 (patch) | |
| tree | e50d2dd8447a5d5d900d83d7c1b0f58c5090e61d /include/llvm/CodeGen/MachineScheduler.h | |
| parent | e2326ad2c00fe3e8e21dbf312f1987ba92308733 (diff) | |
MI Sched: eliminate local vreg copies.
For now, we just reschedule instructions that use the copied vregs and
let regalloc elliminate it. I would really like to eliminate the
copies on-the-fly during scheduling, but we need a complete
implementation of repairIntervalsInRange() first.
The general strategy is for the register coalescer to eliminate as
many global copies as possible and shrink live ranges to be
extended-basic-block local. The coalescer should not have to worry
about resolving local copies (e.g. it shouldn't attemp to reorder
instructions). The scheduler is a much better place to deal with local
interference. The coalescer side of this equation needs work.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180193 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/CodeGen/MachineScheduler.h')
| -rw-r--r-- | include/llvm/CodeGen/MachineScheduler.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/MachineScheduler.h b/include/llvm/CodeGen/MachineScheduler.h index 99cbd870ec..769e4b42a5 100644 --- a/include/llvm/CodeGen/MachineScheduler.h +++ b/include/llvm/CodeGen/MachineScheduler.h @@ -274,6 +274,10 @@ public: Mutations.push_back(Mutation); } + /// \brief True if an edge can be added from PredSU to SuccSU without creating + /// a cycle. + bool canAddEdge(SUnit *SuccSU, SUnit *PredSU); + /// \brief Add a DAG edge to the given SU with the given predecessor /// dependence data. /// |