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misched: add a hook for custom DAG postprocessing.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163915 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-09-14 17:22:42 +00:00
parent d15e657690
commit d039b383e7
2 changed files with 31 additions and 0 deletions
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22
include/llvm/CodeGen/MachineScheduler.h
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@ -179,6 +179,14 @@ public:
#endif
};
/// Mutate the DAG as a postpass after normal DAG building.
class ScheduleDAGMutation {
public:
virtual ~ScheduleDAGMutation() {}
virtual void apply(ScheduleDAGMI *DAG) = 0;
};
/// ScheduleDAGMI is an implementation of ScheduleDAGInstrs that schedules
/// machine instructions while updating LiveIntervals and tracking regpressure.
class ScheduleDAGMI : public ScheduleDAGInstrs {
@ -187,6 +195,9 @@ protected:
RegisterClassInfo *RegClassInfo;
MachineSchedStrategy *SchedImpl;
/// Ordered list of DAG postprocessing steps.
std::vector<ScheduleDAGMutation*> Mutations;
MachineBasicBlock::iterator LiveRegionEnd;
/// Register pressure in this region computed by buildSchedGraph.
@ -229,6 +240,13 @@ public:
delete SchedImpl;
}
/// Add a postprocessing step to the DAG builder.
/// Mutations are applied in the order that they are added after normal DAG
/// building and before MachineSchedStrategy initialization.
void addMutation(ScheduleDAGMutation *Mutation) {
Mutations.push_back(Mutation);
}
MachineBasicBlock::iterator top() const { return CurrentTop; }
MachineBasicBlock::iterator bottom() const { return CurrentBottom; }
@ -282,6 +300,10 @@ protected:
/// bottom of the DAG region without covereing any unscheduled instruction.
void buildDAGWithRegPressure();
/// Apply each ScheduleDAGMutation step in order. This allows different
/// instances of ScheduleDAGMI to perform custom DAG postprocessing.
void postprocessDAG();
/// Identify DAG roots and setup scheduler queues.
void initQueues();

9
lib/CodeGen/MachineScheduler.cpp
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@ -484,6 +484,8 @@ void ScheduleDAGMI::releaseRoots() {
void ScheduleDAGMI::schedule() {
buildDAGWithRegPressure();
postprocessDAG();
DEBUG(for (unsigned su = 0, e = SUnits.size(); su != e; ++su)
SUnits[su].dumpAll(this));
@ -522,6 +524,13 @@ void ScheduleDAGMI::buildDAGWithRegPressure() {
initRegPressure();
}
/// Apply each ScheduleDAGMutation step in order.
void ScheduleDAGMI::postprocessDAG() {
for (unsigned i = 0, e = Mutations.size(); i < e; ++i) {
Mutations[i]->apply(this);
}
}
/// Identify DAG roots and setup scheduler queues.
void ScheduleDAGMI::initQueues() {
// Initialize the strategy before modifying the DAG.