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misched: Invoke the DAG builder on each sequence of schedulable instructions.

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llvm-svn: 148171
This commit is contained in:
Andrew Trick 2012-01-14 02:17:09 +00:00
parent ce507adb56
commit 6b08526310
1 changed files with 30 additions and 5 deletions
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29
lib/CodeGen/MachineScheduler.cpp
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@ -20,6 +20,7 @@
#include "llvm/CodeGen/MachinePassRegistry.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
@ -175,9 +176,12 @@ SchedDefaultRegistry("default", "Activate the scheduler pass, "
/// Schedule - This is called back from ScheduleDAGInstrs::Run() when it's
/// time to do some work.
void MachineScheduler::Schedule() {
BuildSchedGraph(&Pass->getAnalysis<AliasAnalysis>());
DEBUG(dbgs() << "********** MI Scheduling **********\n");
DEBUG(for (unsigned su = 0, e = SUnits.size(); su != e; ++su)
SUnits[su].dumpAll(this));
// TODO: Put interesting things here.
}
@ -202,12 +206,33 @@ bool MachineSchedulerPass::runOnMachineFunction(MachineFunction &mf) {
for (MachineFunction::iterator MBB = MF->begin(), MBBEnd = MF->end();
MBB != MBBEnd; ++MBB) {
// Break the block into scheduling regions [I, RegionEnd), and schedule each
// region as soon as it is discovered.
unsigned RemainingCount = MBB->size();
for(MachineBasicBlock::iterator RegionEnd = MBB->end();
RegionEnd != MBB->begin();) {
// The next region starts above the previous region. Look backward in the
// instruction stream until we find the nearest boundary.
MachineBasicBlock::iterator I = RegionEnd;
for(;I != MBB->begin(); --I) {
if (TII->isSchedulingBoundary(llvm::prior(I), MBB, *MF))
break;
}
if (I == RegionEnd || I == llvm::prior(RegionEnd)) {
// Skip empty or single instruction scheduling regions.
RegionEnd = llvm::prior(RegionEnd);
continue;
}
DEBUG(dbgs() << "MachineScheduling " << MF->getFunction()->getName()
<< ":BB#" << MBB->getNumber() << "\n");
<< ":BB#" << MBB->getNumber() << "\n From: " << *I << " To: "
<< *RegionEnd << " Remaining: " << RemainingCount << "\n");
// Inform ScheduleDAGInstrs of the region being scheduler. It calls back
// to our Schedule() method.
Scheduler->Run(MBB, MBB->begin(), MBB->end(), MBB->size());
Scheduler->Run(MBB, I, RegionEnd, MBB->size());
RegionEnd = I;
}
assert(RemainingCount == 0 && "Instruction count mismatch!");
}
return true;
}