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llvm-6502/lib/Target/SparcV9/ModuloScheduling/ModuloScheduling.cpp
Chris Lattner 9daa8a12d3 Random cleanups 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7247 91177308-0d34-0410-b5e6-96231b3b80d8
2003-07-23 14:59:40 +00:00

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//===- ModuloScheduling.cpp - Modulo Software Pipelining ------------------===//
//
// Implements the llvm/CodeGen/ModuloScheduling.h interface
//
//===----------------------------------------------------------------------===//
#include "llvm/BasicBlock.h"
#include "llvm/Constants.h"
#include "llvm/iTerminators.h"
#include "llvm/iPHINode.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineCodeForInstruction.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/InstrSelection.h"
#include "llvm/Target/TargetSchedInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "Support/CommandLine.h"
#include "Support/Statistic.h"
#include "ModuloSchedGraph.h"
#include "ModuloScheduling.h"
#include <algorithm>
#include <fstream>
//************************************************************
// printing Debug information
// ModuloSchedDebugLevel stores the value of debug level
// modsched_os is the ostream to dump debug information, which is written into
// the file 'moduloSchedDebugInfo.output'
// see ModuloSchedulingPass::runOnFunction()
//************************************************************
ModuloSchedDebugLevel_t ModuloSchedDebugLevel;
cl::opt<ModuloSchedDebugLevel_t,true>
SDL_opt("modsched", cl::Hidden, cl::location(ModuloSchedDebugLevel),
cl::desc("enable modulo scheduling debugging information"),
cl::values(clEnumValN(ModuloSchedDebugLevel_NoDebugInfo,
"none", "disable debug output"),
clEnumValN(ModuloSchedDebugLevel_PrintSchedule,
"psched", "print original and new schedule"),
clEnumValN(ModuloSchedDebugLevel_PrintScheduleProcess,
"pschedproc",
"print how the new schdule is produced"),
0));
// Computes the schedule and inserts epilogue and prologue
//
void
ModuloScheduling::instrScheduling(){
if (ModuloScheduling::printScheduleProcess())
DEBUG_PRINT(std::cerr << "************ computing modulo schedule ***********\n");
const TargetSchedInfo & msi = target.getSchedInfo();
//number of issue slots in the in each cycle
int numIssueSlots = msi.maxNumIssueTotal;
//compute the schedule
bool success = false;
while (!success) {
//clear memory from the last round and initialize if necessary
clearInitMem(msi);
//compute schedule and coreSchedule with the current II
success = computeSchedule();
if (!success) {
II++;
if (ModuloScheduling::printScheduleProcess())
DEBUG_PRINT(std::cerr << "increase II to " << II << "\n");
}
}
//print the final schedule
dumpFinalSchedule();
//the schedule has been computed
//create epilogue, prologue and kernel BasicBlock
//find the successor for this BasicBlock
BasicBlock *succ_bb = getSuccBB(bb);
//print the original BasicBlock if necessary
if (ModuloScheduling::printSchedule()) {
DEBUG_PRINT(std::cerr << "dumping the orginal block\n");
graph.dump(bb);
}
//construction of prologue, kernel and epilogue
/*
BasicBlock *kernel = bb->splitBasicBlock(bb->begin());
BasicBlock *prologue = bb;
BasicBlock *epilogue = kernel->splitBasicBlock(kernel->begin());
*/
// Construct prologue
/*constructPrologue(prologue);*/
// Construct kernel
/*constructKernel(prologue, kernel, epilogue);*/
// Construct epilogue
/*constructEpilogue(epilogue, succ_bb);*/
//print the BasicBlocks if necessary
// if (0){
// DEBUG_PRINT(std::cerr << "dumping the prologue block:\n");
// graph.dump(prologue);
// DEBUG_PRINT(std::cerr << "dumping the kernel block\n");
// graph.dump(kernel);
// DEBUG_PRINT(std::cerr << "dumping the epilogue block\n");
// graph.dump(epilogue);
// }
}
// Clear memory from the last round and initialize if necessary
//
void
ModuloScheduling::clearInitMem(const TargetSchedInfo & msi){
unsigned numIssueSlots = msi.maxNumIssueTotal;
// clear nodeScheduled from the last round
if (ModuloScheduling::printScheduleProcess()) {
DEBUG_PRINT(std::cerr << "***** new round with II= " << II << " ***********\n");
DEBUG_PRINT(std::cerr <<
" ************clear the vector nodeScheduled*************\n");
}
nodeScheduled.clear();
// clear resourceTable from the last round and reset it
resourceTable.clear();
for (unsigned i = 0; i < II; ++i)
resourceTable.push_back(msi.resourceNumVector);
// clear the schdule and coreSchedule from the last round
schedule.clear();
coreSchedule.clear();
// create a coreSchedule of size II*numIssueSlots
// each entry is NULL
while (coreSchedule.size() < II) {
std::vector < ModuloSchedGraphNode * >*newCycle =
new std::vector < ModuloSchedGraphNode * >();
for (unsigned k = 0; k < numIssueSlots; ++k)
newCycle->push_back(NULL);
coreSchedule.push_back(*newCycle);
}
}
// Compute schedule and coreSchedule with the current II
//
bool
ModuloScheduling::computeSchedule(){
if (ModuloScheduling::printScheduleProcess())
DEBUG_PRINT(std::cerr << "start to compute schedule\n");
// Loop over the ordered nodes
for (NodeVec::const_iterator I = oNodes.begin(); I != oNodes.end(); ++I) {
// Try to schedule for node I
if (ModuloScheduling::printScheduleProcess())
dumpScheduling();
ModuloSchedGraphNode *node = *I;
// Compute whether this node has successor(s)
bool succ = true;
// Compute whether this node has predessor(s)
bool pred = true;
NodeVec schSucc = graph.vectorConj(nodeScheduled, graph.succSet(node));
if (schSucc.empty())
succ = false;
NodeVec schPred = graph.vectorConj(nodeScheduled, graph.predSet(node));
if (schPred.empty())
pred = false;
//startTime: the earliest time we will try to schedule this node
//endTime: the latest time we will try to schedule this node
int startTime, endTime;
//node's earlyStart: possible earliest time to schedule this node
//node's lateStart: possible latest time to schedule this node
node->setEarlyStart(-1);
node->setLateStart(9999);
//this node has predessor but no successor
if (!succ && pred) {
// This node's earlyStart is it's predessor's schedule time + the edge
// delay - the iteration difference* II
for (unsigned i = 0; i < schPred.size(); i++) {
ModuloSchedGraphNode *predNode = schPred[i];
SchedGraphEdge *edge =
graph.getMaxDelayEdge(predNode->getNodeId(),
node->getNodeId());
int temp =
predNode->getSchTime() + edge->getMinDelay() -
edge->getIteDiff() * II;
node->setEarlyStart(std::max(node->getEarlyStart(), temp));
}
startTime = node->getEarlyStart();
endTime = node->getEarlyStart() + II - 1;
}
// This node has a successor but no predecessor
if (succ && !pred) {
for (unsigned i = 0; i < schSucc.size(); ++i) {
ModuloSchedGraphNode *succNode = schSucc[i];
SchedGraphEdge *edge =
graph.getMaxDelayEdge(succNode->getNodeId(),
node->getNodeId());
int temp =
succNode->getSchTime() - edge->getMinDelay() +
edge->getIteDiff() * II;
node->setLateStart(std::min(node->getEarlyStart(), temp));
}
startTime = node->getLateStart() - II + 1;
endTime = node->getLateStart();
}
// This node has both successors and predecessors
if (succ && pred) {
for (unsigned i = 0; i < schPred.size(); ++i) {
ModuloSchedGraphNode *predNode = schPred[i];
SchedGraphEdge *edge =
graph.getMaxDelayEdge(predNode->getNodeId(),
node->getNodeId());
int temp =
predNode->getSchTime() + edge->getMinDelay() -
edge->getIteDiff() * II;
node->setEarlyStart(std::max(node->getEarlyStart(), temp));
}
for (unsigned i = 0; i < schSucc.size(); ++i) {
ModuloSchedGraphNode *succNode = schSucc[i];
SchedGraphEdge *edge =
graph.getMaxDelayEdge(succNode->getNodeId(),
node->getNodeId());
int temp =
succNode->getSchTime() - edge->getMinDelay() +
edge->getIteDiff() * II;
node->setLateStart(std::min(node->getEarlyStart(), temp));
}
startTime = node->getEarlyStart();
endTime = std::min(node->getLateStart(),
node->getEarlyStart() + ((int) II) - 1);
}
//this node has no successor or predessor
if (!succ && !pred) {
node->setEarlyStart(node->getASAP());
startTime = node->getEarlyStart();
endTime = node->getEarlyStart() + II - 1;
}
//try to schedule this node based on the startTime and endTime
if (ModuloScheduling::printScheduleProcess())
DEBUG_PRINT(std::cerr << "scheduling the node " << (*I)->getNodeId() << "\n");
bool success =
this->ScheduleNode(node, startTime, endTime, nodeScheduled);
if (!success)
return false;
}
return true;
}
// Get the successor of the BasicBlock
//
BasicBlock *
ModuloScheduling::getSuccBB(BasicBlock *bb){
BasicBlock *succ_bb;
for (unsigned i = 0; i < II; ++i)
for (unsigned j = 0; j < coreSchedule[i].size(); ++j)
if (coreSchedule[i][j]) {
const Instruction *ist = coreSchedule[i][j]->getInst();
//we can get successor from the BranchInst instruction
//assume we only have one successor (besides itself) here
if (BranchInst::classof(ist)) {
BranchInst *bi = (BranchInst *) ist;
assert(bi->isConditional() &&
"the branchInst is not a conditional one");
assert(bi->getNumSuccessors() == 2
&& " more than two successors?");
BasicBlock *bb1 = bi->getSuccessor(0);
BasicBlock *bb2 = bi->getSuccessor(1);
assert((bb1 == bb || bb2 == bb) &&
" None of its successors is itself?");
if (bb1 == bb)
succ_bb = bb2;
else
succ_bb = bb1;
return succ_bb;
}
}
assert(0 && "NO Successor?");
return NULL;
}
// Get the predecessor of the BasicBlock
//
BasicBlock *
ModuloScheduling::getPredBB(BasicBlock *bb){
BasicBlock *pred_bb;
for (unsigned i = 0; i < II; ++i)
for (unsigned j = 0; j < coreSchedule[i].size(); ++j)
if (coreSchedule[i][j]) {
const Instruction *ist = coreSchedule[i][j]->getInst();
//we can get predecessor from the PHINode instruction
//assume we only have one predecessor (besides itself) here
if (PHINode::classof(ist)) {
PHINode *phi = (PHINode *) ist;
assert(phi->getNumIncomingValues() == 2 &&
" the number of incoming value is not equal to two? ");
BasicBlock *bb1 = phi->getIncomingBlock(0);
BasicBlock *bb2 = phi->getIncomingBlock(1);
assert((bb1 == bb || bb2 == bb) &&
" None of its predecessor is itself?");
if (bb1 == bb)
pred_bb = bb2;
else
pred_bb = bb1;
return pred_bb;
}
}
assert(0 && " no predecessor?");
return NULL;
}
// Construct the prologue
//
void
ModuloScheduling::constructPrologue(BasicBlock *prologue){
InstListType & prologue_ist = prologue->getInstList();
vvNodeType & tempSchedule_prologue =
*(new std::vector<std::vector<ModuloSchedGraphNode*> >(schedule));
//compute the schedule for prologue
unsigned round = 0;
unsigned scheduleSize = schedule.size();
while (round < scheduleSize / II) {
round++;
for (unsigned i = 0; i < scheduleSize; ++i) {
if (round * II + i >= scheduleSize)
break;
for (unsigned j = 0; j < schedule[i].size(); ++j) {
if (schedule[i][j]) {
assert(tempSchedule_prologue[round * II + i][j] == NULL &&
"table not consitent with core table");
// move the schedule one iteration ahead and overlap with the original
tempSchedule_prologue[round * II + i][j] = schedule[i][j];
}
}
}
}
// Clear the clone memory in the core schedule instructions
clearCloneMemory();
// Fill in the prologue
for (unsigned i = 0; i < ceil(1.0 * scheduleSize / II - 1) * II; ++i)
for (unsigned j = 0; j < tempSchedule_prologue[i].size(); ++j)
if (tempSchedule_prologue[i][j]) {
//get the instruction
Instruction *orn =
(Instruction *) tempSchedule_prologue[i][j]->getInst();
//made a clone of it
Instruction *cln = cloneInstSetMemory(orn);
//insert the instruction
prologue_ist.insert(prologue_ist.back(), cln);
//if there is PHINode in the prologue, the incoming value from itself
//should be removed because it is not a loop any longer
if (PHINode::classof(cln)) {
PHINode *phi = (PHINode *) cln;
phi->removeIncomingValue(phi->getParent());
}
}
}
// Construct the kernel BasicBlock
//
void
ModuloScheduling::constructKernel(BasicBlock *prologue,
BasicBlock *kernel,
BasicBlock *epilogue){
//*************fill instructions in the kernel****************
InstListType & kernel_ist = kernel->getInstList();
BranchInst *brchInst;
PHINode *phiInst, *phiCln;
for (unsigned i = 0; i < coreSchedule.size(); ++i)
for (unsigned j = 0; j < coreSchedule[i].size(); ++j)
if (coreSchedule[i][j]) {
// Take care of branch instruction differently with normal instructions
if (BranchInst::classof(coreSchedule[i][j]->getInst())) {
brchInst = (BranchInst *) coreSchedule[i][j]->getInst();
continue;
}
// Take care of PHINode instruction differently with normal instructions
if (PHINode::classof(coreSchedule[i][j]->getInst())) {
phiInst = (PHINode *) coreSchedule[i][j]->getInst();
Instruction *cln = cloneInstSetMemory(phiInst);
kernel_ist.insert(kernel_ist.back(), cln);
phiCln = (PHINode *) cln;
continue;
}
//for normal instructions: made a clone and insert it in the kernel_ist
Instruction *cln =
cloneInstSetMemory((Instruction *) coreSchedule[i][j]->
getInst());
kernel_ist.insert(kernel_ist.back(), cln);
}
// The two incoming BasicBlock for PHINode is the prologue and the kernel
// (itself)
phiCln->setIncomingBlock(0, prologue);
phiCln->setIncomingBlock(1, kernel);
// The incoming value for the kernel (itself) is the new value which is
// computed in the kernel
Instruction *originalVal = (Instruction *) phiInst->getIncomingValue(1);
phiCln->setIncomingValue(1, originalVal->getClone());
// Make a clone of the branch instruction and insert it in the end
BranchInst *cln = (BranchInst *) cloneInstSetMemory(brchInst);
kernel_ist.insert(kernel_ist.back(), cln);
// delete the unconditional branch instruction, which is generated when
// splitting the basicBlock
kernel_ist.erase(--kernel_ist.end());
// set the first successor to itself
cln->setSuccessor(0, kernel);
// set the second successor to eiplogue
cln->setSuccessor(1, epilogue);
//*****change the condition*******
//get the condition instruction
Instruction *cond = (Instruction *) cln->getCondition();
//get the condition's second operand, it should be a constant
Value *operand = cond->getOperand(1);
assert(ConstantSInt::classof(operand));
//change the constant in the condtion instruction
ConstantSInt *iteTimes =
ConstantSInt::get(operand->getType(),
((ConstantSInt *) operand)->getValue() - II + 1);
cond->setOperand(1, iteTimes);
}
// Construct the epilogue
//
void
ModuloScheduling::constructEpilogue(BasicBlock *epilogue,
BasicBlock *succ_bb){
//compute the schedule for epilogue
vvNodeType &tempSchedule_epilogue =
*(new std::vector<std::vector<ModuloSchedGraphNode*> >(schedule));
unsigned scheduleSize = schedule.size();
int round = 0;
while (round < ceil(1.0 * scheduleSize / II) - 1) {
round++;
for (unsigned i = 0; i < scheduleSize; i++) {
if (i + round * II >= scheduleSize)
break;
for (unsigned j = 0; j < schedule[i].size(); j++)
if (schedule[i + round * II][j]) {
assert(tempSchedule_epilogue[i][j] == NULL
&& "table not consitant with core table");
//move the schdule one iteration behind and overlap
tempSchedule_epilogue[i][j] = schedule[i + round * II][j];
}
}
}
//fill in the epilogue
InstListType & epilogue_ist = epilogue->getInstList();
for (unsigned i = II; i < scheduleSize; i++)
for (unsigned j = 0; j < tempSchedule_epilogue[i].size(); j++)
if (tempSchedule_epilogue[i][j]) {
Instruction *inst =
(Instruction *) tempSchedule_epilogue[i][j]->getInst();
//BranchInst and PHINode should be treated differently
//BranchInst:unecessary, simly omitted
//PHINode: omitted
if (!BranchInst::classof(inst) && !PHINode::classof(inst)) {
//make a clone instruction and insert it into the epilogue
Instruction *cln = cloneInstSetMemory(inst);
epilogue_ist.push_front(cln);
}
}
//*************delete the original instructions****************//
//to delete the original instructions, we have to make sure their use is zero
//update original core instruction's uses, using its clone instread
for (unsigned i = 0; i < II; i++)
for (unsigned j = 0; j < coreSchedule[i].size(); j++) {
if (coreSchedule[i][j])
updateUseWithClone((Instruction *) coreSchedule[i][j]->getInst());
}
//erase these instructions
for (unsigned i = 0; i < II; i++)
for (unsigned j = 0; j < coreSchedule[i].size(); j++)
if (coreSchedule[i][j]) {
Instruction *ist = (Instruction *) coreSchedule[i][j]->getInst();
ist->getParent()->getInstList().erase(ist);
}
//finally, insert an unconditional branch instruction at the end
epilogue_ist.push_back(new BranchInst(succ_bb));
}
//------------------------------------------------------------------------------
//this function replace the value(instruction) ist in other instructions with
//its latest clone i.e. after this function is called, the ist is not used
//anywhere and it can be erased.
//------------------------------------------------------------------------------
void
ModuloScheduling::updateUseWithClone(Instruction * ist){
while (ist->use_size() > 0) {
bool destroyed = false;
//other instruction is using this value ist
assert(Instruction::classof(*ist->use_begin()));
Instruction *inst = (Instruction *) (*ist->use_begin());
for (unsigned i = 0; i < inst->getNumOperands(); i++)
if (inst->getOperand(i) == ist && ist->getClone()) {
// if the instruction is TmpInstruction, simly delete it because it has
// no parent and it does not belongs to any BasicBlock
if (TmpInstruction::classof(inst)) {
delete inst;
destroyed = true;
break;
}
//otherwise, set the instruction's operand to the value's clone
inst->setOperand(i, ist->getClone());
//the use from the original value ist is destroyed
destroyed = true;
break;
}
if (!destroyed) {
//if the use can not be destroyed , something is wrong
inst->dump();
assert(0 && "this use can not be destroyed");
}
}
}
//********************************************************
//this function clear all clone mememoy
//i.e. set all instruction's clone memory to NULL
//*****************************************************
void
ModuloScheduling::clearCloneMemory(){
for (unsigned i = 0; i < coreSchedule.size(); i++)
for (unsigned j = 0; j < coreSchedule[i].size(); j++)
if (coreSchedule[i][j])
((Instruction *) coreSchedule[i][j]->getInst())->clearClone();
}
//******************************************************************************
// this function make a clone of the instruction orn the cloned instruction will
// use the orn's operands' latest clone as its operands it is done this way
// because LLVM is in SSA form and we should use the correct value
//this fuction also update the instruction orn's latest clone memory
//******************************************************************************
Instruction *
ModuloScheduling::cloneInstSetMemory(Instruction * orn){
// make a clone instruction
Instruction *cln = orn->clone();
// update the operands
for (unsigned k = 0; k < orn->getNumOperands(); k++) {
const Value *op = orn->getOperand(k);
if (Instruction::classof(op) && ((Instruction *) op)->getClone()) {
Instruction *op_inst = (Instruction *) op;
cln->setOperand(k, op_inst->getClone());
}
}
// update clone memory
orn->setClone(cln);
return cln;
}
bool
ModuloScheduling::ScheduleNode(ModuloSchedGraphNode * node,
unsigned start, unsigned end,
NodeVec & nodeScheduled){
const TargetSchedInfo & msi = target.getSchedInfo();
unsigned int numIssueSlots = msi.maxNumIssueTotal;
if (ModuloScheduling::printScheduleProcess())
DEBUG_PRINT(std::cerr << "startTime= " << start << " endTime= " << end << "\n");
bool isScheduled = false;
for (unsigned i = start; i <= end; i++) {
if (ModuloScheduling::printScheduleProcess())
DEBUG_PRINT(std::cerr << " now try cycle " << i << ":" << "\n");
for (unsigned j = 0; j < numIssueSlots; j++) {
unsigned int core_i = i % II;
unsigned int core_j = j;
if (ModuloScheduling::printScheduleProcess())
DEBUG_PRINT(std::cerr << "\t Trying slot " << j << "...........");
//check the resouce table, make sure there is no resource conflicts
const Instruction *instr = node->getInst();
MachineCodeForInstruction & tempMvec =
MachineCodeForInstruction::get(instr);
bool resourceConflict = false;
const TargetInstrInfo & mii = msi.getInstrInfo();
if (coreSchedule.size() < core_i + 1
|| !coreSchedule[core_i][core_j]) {
//this->dumpResourceUsageTable();
int latency = 0;
for (unsigned k = 0; k < tempMvec.size(); k++) {
MachineInstr *minstr = tempMvec[k];
InstrRUsage rUsage = msi.getInstrRUsage(minstr->getOpCode());
std::vector < std::vector < resourceId_t > >resources
= rUsage.resourcesByCycle;
updateResourceTable(resources, i + latency);
latency += std::max(mii.minLatency(minstr->getOpCode()), 1);
}
//this->dumpResourceUsageTable();
latency = 0;
if (resourceTableNegative()) {
//undo-update the resource table
for (unsigned k = 0; k < tempMvec.size(); k++) {
MachineInstr *minstr = tempMvec[k];
InstrRUsage rUsage = msi.getInstrRUsage(minstr->getOpCode());
std::vector < std::vector < resourceId_t > >resources
= rUsage.resourcesByCycle;
undoUpdateResourceTable(resources, i + latency);
latency += std::max(mii.minLatency(minstr->getOpCode()), 1);
}
resourceConflict = true;
}
}
if (!resourceConflict && !coreSchedule[core_i][core_j]) {
if (ModuloScheduling::printScheduleProcess()) {
DEBUG_PRINT(std::cerr << " OK!" << "\n");
DEBUG_PRINT(std::cerr << "Node " << node->getNodeId() << " scheduled.\n");
}
//schedule[i][j]=node;
while (schedule.size() <= i) {
std::vector < ModuloSchedGraphNode * >*newCycle =
new std::vector < ModuloSchedGraphNode * >();
for (unsigned k = 0; k < numIssueSlots; k++)
newCycle->push_back(NULL);
schedule.push_back(*newCycle);
}
std::vector<ModuloSchedGraphNode*>::iterator startIterator;
startIterator = schedule[i].begin();
schedule[i].insert(startIterator + j, node);
startIterator = schedule[i].begin();
schedule[i].erase(startIterator + j + 1);
//update coreSchedule
//coreSchedule[core_i][core_j]=node;
while (coreSchedule.size() <= core_i) {
std::vector<ModuloSchedGraphNode*> *newCycle =
new std::vector<ModuloSchedGraphNode*>();
for (unsigned k = 0; k < numIssueSlots; k++)
newCycle->push_back(NULL);
coreSchedule.push_back(*newCycle);
}
startIterator = coreSchedule[core_i].begin();
coreSchedule[core_i].insert(startIterator + core_j, node);
startIterator = coreSchedule[core_i].begin();
coreSchedule[core_i].erase(startIterator + core_j + 1);
node->setSchTime(i);
isScheduled = true;
nodeScheduled.push_back(node);
break;
} else if (coreSchedule[core_i][core_j]) {
if (ModuloScheduling::printScheduleProcess())
DEBUG_PRINT(std::cerr << " Slot not available\n");
} else {
if (ModuloScheduling::printScheduleProcess())
DEBUG_PRINT(std::cerr << " Resource conflicts\n");
}
}
if (isScheduled)
break;
}
//assert(nodeScheduled &&"this node can not be scheduled?");
return isScheduled;
}
void
ModuloScheduling::updateResourceTable(Resources useResources,
int startCycle){
for (unsigned i = 0; i < useResources.size(); i++) {
int absCycle = startCycle + i;
int coreCycle = absCycle % II;
std::vector<std::pair<int,int> > &resourceRemained =
resourceTable[coreCycle];
std::vector < unsigned int >&resourceUsed = useResources[i];
for (unsigned j = 0; j < resourceUsed.size(); j++) {
for (unsigned k = 0; k < resourceRemained.size(); k++)
if ((int) resourceUsed[j] == resourceRemained[k].first) {
resourceRemained[k].second--;
}
}
}
}
void
ModuloScheduling::undoUpdateResourceTable(Resources useResources,
int startCycle){
for (unsigned i = 0; i < useResources.size(); i++) {
int absCycle = startCycle + i;
int coreCycle = absCycle % II;
std::vector<std::pair<int,int> > &resourceRemained =
resourceTable[coreCycle];
std::vector < unsigned int >&resourceUsed = useResources[i];
for (unsigned j = 0; j < resourceUsed.size(); j++) {
for (unsigned k = 0; k < resourceRemained.size(); k++)
if ((int) resourceUsed[j] == resourceRemained[k].first) {
resourceRemained[k].second++;
}
}
}
}
//-----------------------------------------------------------------------
// Function: resourceTableNegative
// return value:
// return false if any element in the resouceTable is negative
// otherwise return true
// Purpose:
// this function is used to determine if an instruction is eligible for
// schedule at certain cycle
//-----------------------------------------------------------------------
bool
ModuloScheduling::resourceTableNegative(){
assert(resourceTable.size() == (unsigned) II
&& "resouceTable size must be equal to II");
bool isNegative = false;
for (unsigned i = 0; i < resourceTable.size(); i++)
for (unsigned j = 0; j < resourceTable[i].size(); j++) {
if (resourceTable[i][j].second < 0) {
isNegative = true;
break;
}
}
return isNegative;
}
//----------------------------------------------------------------------
// Function: dumpResouceUsageTable
// Purpose:
// print out ResouceTable for debug
//
//------------------------------------------------------------------------
void
ModuloScheduling::dumpResourceUsageTable(){
DEBUG_PRINT(std::cerr << "dumping resource usage table\n");
for (unsigned i = 0; i < resourceTable.size(); i++) {
for (unsigned j = 0; j < resourceTable[i].size(); j++)
DEBUG_PRINT(std::cerr << resourceTable[i][j].first
<< ":" << resourceTable[i][j].second << " ");
DEBUG_PRINT(std::cerr << "\n");
}
}
//----------------------------------------------------------------------
//Function: dumpSchedule
//Purpose:
// print out thisSchedule for debug
//
//-----------------------------------------------------------------------
void
ModuloScheduling::dumpSchedule(vvNodeType thisSchedule){
const TargetSchedInfo & msi = target.getSchedInfo();
unsigned numIssueSlots = msi.maxNumIssueTotal;
for (unsigned i = 0; i < numIssueSlots; i++)
DEBUG_PRINT(std::cerr << "\t#");
DEBUG_PRINT(std::cerr << "\n");
for (unsigned i = 0; i < thisSchedule.size(); i++) {
DEBUG_PRINT(std::cerr << "cycle" << i << ": ");
for (unsigned j = 0; j < thisSchedule[i].size(); j++)
if (thisSchedule[i][j] != NULL)
DEBUG_PRINT(std::cerr << thisSchedule[i][j]->getNodeId() << "\t");
else
DEBUG_PRINT(std::cerr << "\t");
DEBUG_PRINT(std::cerr << "\n");
}
}
//----------------------------------------------------
//Function: dumpScheduling
//Purpose:
// print out the schedule and coreSchedule for debug
//
//-------------------------------------------------------
void
ModuloScheduling::dumpScheduling(){
DEBUG_PRINT(std::cerr << "dump schedule:" << "\n");
const TargetSchedInfo & msi = target.getSchedInfo();
unsigned numIssueSlots = msi.maxNumIssueTotal;
for (unsigned i = 0; i < numIssueSlots; i++)
DEBUG_PRINT(std::cerr << "\t#");
DEBUG_PRINT(std::cerr << "\n");
for (unsigned i = 0; i < schedule.size(); i++) {
DEBUG_PRINT(std::cerr << "cycle" << i << ": ");
for (unsigned j = 0; j < schedule[i].size(); j++)
if (schedule[i][j] != NULL)
DEBUG_PRINT(std::cerr << schedule[i][j]->getNodeId() << "\t");
else
DEBUG_PRINT(std::cerr << "\t");
DEBUG_PRINT(std::cerr << "\n");
}
DEBUG_PRINT(std::cerr << "dump coreSchedule:" << "\n");
for (unsigned i = 0; i < numIssueSlots; i++)
DEBUG_PRINT(std::cerr << "\t#");
DEBUG_PRINT(std::cerr << "\n");
for (unsigned i = 0; i < coreSchedule.size(); i++) {
DEBUG_PRINT(std::cerr << "cycle" << i << ": ");
for (unsigned j = 0; j < coreSchedule[i].size(); j++)
if (coreSchedule[i][j] != NULL)
DEBUG_PRINT(std::cerr << coreSchedule[i][j]->getNodeId() << "\t");
else
DEBUG_PRINT(std::cerr << "\t");
DEBUG_PRINT(std::cerr << "\n");
}
}
/*
print out final schedule
*/
void
ModuloScheduling::dumpFinalSchedule(){
std::cerr << "dump schedule:" << "\n";
const TargetSchedInfo & msi = target.getSchedInfo();
unsigned numIssueSlots = msi.maxNumIssueTotal;
for (unsigned i = 0; i < numIssueSlots; i++)
std::cerr << "\t#";
std::cerr << "\n";
for (unsigned i = 0; i < schedule.size(); i++) {
std::cerr << "cycle" << i << ": ";
for (unsigned j = 0; j < schedule[i].size(); j++)
if (schedule[i][j] != NULL)
std::cerr << schedule[i][j]->getNodeId() << "\t";
else
std::cerr << "\t";
std::cerr << "\n";
}
std::cerr << "dump coreSchedule:" << "\n";
for (unsigned i = 0; i < numIssueSlots; i++)
std::cerr << "\t#";
std::cerr << "\n";
for (unsigned i = 0; i < coreSchedule.size(); i++) {
std::cerr << "cycle" << i << ": ";
for (unsigned j = 0; j < coreSchedule[i].size(); j++)
if (coreSchedule[i][j] != NULL)
std::cerr << coreSchedule[i][j]->getNodeId() << "\t";
else
std::cerr << "\t";
std::cerr << "\n";
}
}
//---------------------------------------------------------------------------
// Function: ModuloSchedulingPass
//
// Purpose:
// Entry point for Modulo Scheduling
// Schedules LLVM instruction
//
//---------------------------------------------------------------------------
namespace {
class ModuloSchedulingPass:public FunctionPass {
const TargetMachine &target;
public:
ModuloSchedulingPass(const TargetMachine &T):target(T) {}
const char *getPassName() const {
return "Modulo Scheduling";
}
// getAnalysisUsage - We use LiveVarInfo...
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
//AU.addRequired(FunctionLiveVarInfo::ID);
}
bool runOnFunction(Function & F);
};
} // end anonymous namespace
bool
ModuloSchedulingPass::runOnFunction(Function &F){
ModuloSchedGraphSet *graphSet = new ModuloSchedGraphSet(&F, target);
ModuloSchedulingSet ModuloSchedulingSet(*graphSet);
DEBUG_PRINT(std::cerr<<"runOnFunction in ModuloSchedulingPass returns\n"<<"\n");
return false;
}
Pass *
createModuloSchedulingPass(const TargetMachine & tgt){
DEBUG_PRINT(std::cerr<<"creating modulo scheduling\n");
return new ModuloSchedulingPass(tgt);
}
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