Adding scheduling class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13783 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 183 insertions, 0 deletions

diff --git a/lib/Target/SparcV9/ModuloScheduling/MSSchedule.cpp b/lib/Target/SparcV9/ModuloScheduling/MSSchedule.cpp
new file mode 100644
index 0000000000..48ddd386fa
--- /dev/null
+++ b/lib/Target/SparcV9/ModuloScheduling/MSSchedule.cpp
@@ -0,0 +1,183 @@
+//===-- MSSchedule.cpp Schedule ---------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// 
+//
+//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "ModuloSched"
+
+#include "MSSchedule.h"
+#include "Support/Debug.h"
+#include "llvm/Target/TargetSchedInfo.h"
+#include <iostream>
+
+using namespace llvm;
+
+bool MSSchedule::insert(MSchedGraphNode *node, int cycle) {
+  
+  //First, check if the cycle has a spot free to start
+  if(schedule.find(cycle) != schedule.end()) {
+    if (schedule[cycle].size() < numIssue) {
+      if(resourcesFree(node, cycle)) {
+	schedule[cycle].push_back(node);
+	DEBUG(std::cerr << "Found spot in map, and there is an issue slot\n");
+	return false;
+      }
+    }
+  }
+  //Not in the map yet so put it in
+  else {
+    if(resourcesFree(node,cycle)) {
+      std::vector<MSchedGraphNode*> nodes;
+      nodes.push_back(node);
+      schedule[cycle] = nodes;
+      DEBUG(std::cerr << "Nothing in map yet so taking an issue slot\n");
+      return false;
+    }
+  }
+
+  DEBUG(std::cerr << "All issue slots taken\n");
+  return true;
+
+}
+
+bool MSSchedule::resourcesFree(MSchedGraphNode *node, int cycle) {
+
+  //Get Resource usage for this instruction
+  const TargetSchedInfo & msi = node->getParent()->getTarget()->getSchedInfo();
+  int currentCycle = cycle;
+  bool success = true;
+
+    //Get resource usage for this instruction
+    InstrRUsage rUsage = msi.getInstrRUsage(node->getInst()->getOpcode());
+    std::vector<std::vector<resourceId_t> > resources = rUsage.resourcesByCycle;
+
+    //Loop over resources in each cycle and increments their usage count
+    for(unsigned i=0; i < resources.size(); ++i) {
+      for(unsigned j=0; j < resources[i].size(); ++j) {
+	int resourceNum = resources[i][j];
+
+	//Check if this resource is available for this cycle
+	std::map<int, std::map<int,int> >::iterator resourcesForCycle = resourceNumPerCycle.find(currentCycle);
+
+	//First check map of resources for this cycle
+	if(resourcesForCycle != resourceNumPerCycle.end()) {
+	  //A map exists for this cycle, so lets check for the resource
+	  std::map<int, int>::iterator resourceUse = resourcesForCycle->second.find(resourceNum);
+	  if(resourceUse != resourcesForCycle->second.end()) {
+	    //Check if there are enough of this resource and if so, increase count and move on
+	    if(resourceUse->second < CPUResource::getCPUResource(resourceNum)->maxNumUsers)
+	      ++resourceUse->second;
+	    else {
+	      success = false;
+	    }
+	  }
+	  //Not in the map yet, so put it
+	  else
+	    resourcesForCycle->second[resourceNum] = 1;
+	
+	}
+	else {
+	  //Create a new map and put in our resource
+	  std::map<int, int> resourceMap;
+	  resourceMap[resourceNum] = 1;
+	  resourceNumPerCycle[cycle] = resourceMap;
+	}
+	if(!success)
+	  break;
+      }
+      if(!success)
+	break;
+	//Increase cycle
+	currentCycle++;
+      }
+
+    if(!success) {
+      int oldCycle = cycle;
+      DEBUG(std::cerr << "Backtrack\n");
+      //Get resource usage for this instruction
+      InstrRUsage rUsage = msi.getInstrRUsage(node->getInst()->getOpcode());
+      std::vector<std::vector<resourceId_t> > resources = rUsage.resourcesByCycle;
+      
+      //Loop over resources in each cycle and increments their usage count
+      for(unsigned i=0; i < resources.size(); ++i) {
+	if(oldCycle < currentCycle) {
+
+	  //Check if this resource is available for this cycle
+	  std::map<int, std::map<int,int> >::iterator resourcesForCycle = resourceNumPerCycle.find(oldCycle);
+
+	  for(unsigned j=0; j < resources[i].size(); ++j) {
+	    int resourceNum = resources[i][j];
+	    //remove from map
+	    std::map<int, int>::iterator resourceUse = resourcesForCycle->second.find(resourceNum);
+	    //assert if not in the map.. since it should be!
+	    //assert(resourceUse != resourcesForCycle.end() && "Resource should be in map!");
+	    --resourceUse->second;
+	  }
+	}
+	else
+	  break;
+	oldCycle++;
+      }
+      return false;
+
+    }
+
+    return true;
+
+}
+
+bool MSSchedule::constructKernel(int II) {
+  MSchedGraphNode *branchNode;
+
+  int stageNum = (schedule.rbegin()->first)/ II;
+  DEBUG(std::cerr << "Number of Stages: " << stageNum << "\n");
+  
+  for(int index = 0; index < II; ++index) {
+    int count = 0;
+    for(int i = index; i <= (schedule.rbegin()->first); i+=II) {  
+      if(schedule.count(i)) {
+	for(std::vector<MSchedGraphNode*>::iterator I = schedule[i].begin(), 
+	      E = schedule[i].end(); I != E; ++I) {
+	  //Check if its a branch
+	  if((*I)->isBranch()) {
+	    branchNode = *I;
+	    assert(count == 0 && "Branch can not be from a previous iteration");
+	  }
+	  else
+	  //FIXME: Check if the instructions in the earlier stage conflict
+	  kernel.push_back(std::make_pair(*I, count));
+	}
+      }
+      ++count;
+    }
+  }
+  
+  //Add Branch to the end
+  kernel.push_back(std::make_pair(branchNode, 0));
+  
+  return true;
+}
+
+
+void MSSchedule::print(std::ostream &os) const {
+  os << "Schedule:\n";
+  
+  for(schedule_const_iterator I =  schedule.begin(), E = schedule.end(); I != E; ++I) {
+    os << "Cycle: " << I->first << "\n";
+    for(std::vector<MSchedGraphNode*>::const_iterator node = I->second.begin(), nodeEnd = I->second.end(); node != nodeEnd; ++node)
+    os << **node << "\n";
+  }
+
+  os << "Kernel:\n";
+  for(std::vector<std::pair<MSchedGraphNode*, int> >::const_iterator I = kernel.begin(),
+	E = kernel.end(); I != E; ++I)
+    os << "Node: " << *(I->first) << " Stage: " << I->second << "\n";
+}
+