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//===----- SchedulePostRAList.cpp - list scheduler ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This implements a top-down list scheduler, using standard algorithms.
// The basic approach uses a priority queue of available nodes to schedule.
// One at a time, nodes are taken from the priority queue (thus in priority
// order), checked for legality to schedule, and emitted if legal.
//
// Nodes may not be legal to schedule either due to structural hazards (e.g.
// pipeline or resource constraints) or because an input to the instruction has
// not completed execution.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "post-RA-sched"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
namespace {
class VISIBILITY_HIDDEN SchedulePostRATDList : public MachineFunctionPass {
public:
static char ID;
SchedulePostRATDList() : MachineFunctionPass(&ID) {}
private:
MachineFunction *MF;
const TargetMachine *TM;
public:
const char *getPassName() const {
return "Post RA top-down list latency scheduler (STUB)";
}
bool runOnMachineFunction(MachineFunction &Fn);
};
char SchedulePostRATDList::ID = 0;
}
bool SchedulePostRATDList::runOnMachineFunction(MachineFunction &Fn) {
DOUT << "SchedulePostRATDList\n";
MF = &Fn;
TM = &MF->getTarget();
// Loop over all of the basic blocks
for (MachineFunction::iterator MBB = Fn.begin(), MBBe = Fn.end();
MBB != MBBe; ++MBB)
;
return true;
}
//===----------------------------------------------------------------------===//
// Public Constructor Functions
//===----------------------------------------------------------------------===//
FunctionPass *llvm::createPostRAScheduler() {
return new SchedulePostRATDList();
}
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