* The itf exposed by InstrScheduling is now a single function to create the right pass

* InstructionScheduling is now a real pass
* InstrSched _uses_ LiveVar analysis, instead of creating it's own copy many times
  through a loop.  In this was LiveVarAnalysis is actually even SHARED by Register
  allocation.
* SchedPriorities is now passed the live var information in


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1700 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 62 insertions, 50 deletions

diff --git a/lib/CodeGen/InstrSched/InstrScheduling.cpp b/lib/CodeGen/InstrSched/InstrScheduling.cpp
index 09d0e40..d625a7b 100644
--- a/lib/CodeGen/InstrSched/InstrScheduling.cpp
+++ b/lib/CodeGen/InstrSched/InstrScheduling.cpp
@@ -14,6 +14,7 @@
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineCodeForInstruction.h"
 #include "llvm/CodeGen/MachineCodeForMethod.h"
+#include "llvm/Analysis/LiveVar/MethodLiveVarInfo.h" // FIXME: Remove when AnalysisUsage sets can be symbolic!
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/BasicBlock.h"
 #include "SchedPriorities.h"
@@ -1491,46 +1492,60 @@ instrIsFeasible(const SchedulingManager& S,
 //   are still in SSA form.
 //---------------------------------------------------------------------------
 
-bool
-ScheduleInstructionsWithSSA(Method* method,
-			    const TargetMachine &target)
-{
-  SchedGraphSet graphSet(method, target);	
-  
-  if (SchedDebugLevel >= Sched_PrintSchedGraphs)
-    {
-      cerr << "\n*** SCHEDULING GRAPHS FOR INSTRUCTION SCHEDULING\n";
-      graphSet.dump();
+namespace {
+  class InstructionSchedulingWithSSA : public MethodPass {
+    const TargetMachine &Target;
+  public:
+    inline InstructionSchedulingWithSSA(const TargetMachine &T) : Target(T) {}
+
+    // getAnalysisUsageInfo - We use LiveVarInfo...
+    virtual void getAnalysisUsageInfo(Pass::AnalysisSet &Requires,
+                                      Pass::AnalysisSet &Destroyed,
+                                      Pass::AnalysisSet &Provided) {
+      Requires.push_back(MethodLiveVarInfo::ID);
     }
+
+    bool runOnMethod(Method *M) {
+      cerr << "Instr scheduling failed for method " << ((Value*)M)->getName()
+           << "\n\n";
+      SchedGraphSet graphSet(M, Target);	
   
-  for (SchedGraphSet::const_iterator GI=graphSet.begin();
-       GI != graphSet.end(); ++GI)
-    {
-      SchedGraph* graph = GI->second;
-      const vector<const BasicBlock*>& bbvec = graph->getBasicBlocks();
-      assert(bbvec.size() == 1 && "Cannot schedule multiple basic blocks");
-      const BasicBlock* bb = bbvec[0];
-      
-      if (SchedDebugLevel >= Sched_PrintSchedTrace)
-	cerr << "\n*** TRACE OF INSTRUCTION SCHEDULING OPERATIONS\n\n";
-      
-      SchedPriorities schedPrio(method, graph);	     // expensive!
-      SchedulingManager S(target, graph, schedPrio);
-      
-      ChooseInstructionsForDelaySlots(S, bb, graph); // modifies graph
+      if (SchedDebugLevel >= Sched_PrintSchedGraphs) {
+        cerr << "\n*** SCHEDULING GRAPHS FOR INSTRUCTION SCHEDULING\n";
+        graphSet.dump();
+      }
+  
+      for (SchedGraphSet::const_iterator GI=graphSet.begin();
+           GI != graphSet.end(); ++GI) {
+        SchedGraph* graph = GI->second;
+        const vector<const BasicBlock*> &bbvec = graph->getBasicBlocks();
+        assert(bbvec.size() == 1 && "Cannot schedule multiple basic blocks");
+        const BasicBlock* bb = bbvec[0];
       
-      ForwardListSchedule(S);			     // computes schedule in S
+        if (SchedDebugLevel >= Sched_PrintSchedTrace)
+          cerr << "\n*** TRACE OF INSTRUCTION SCHEDULING OPERATIONS\n\n";
       
-      RecordSchedule(GI->first, S);		     // records schedule in BB
-    }
+        // expensive!
+        SchedPriorities schedPrio(M, graph, getAnalysis<MethodLiveVarInfo>());
+        SchedulingManager S(Target, graph, schedPrio);
+        
+        ChooseInstructionsForDelaySlots(S, bb, graph); // modifies graph
+        
+        ForwardListSchedule(S);	                     // computes schedule in S
+        
+        RecordSchedule(GI->first, S);                // records schedule in BB
+      }
   
-  if (SchedDebugLevel >= Sched_PrintMachineCode)
-    {
-      cerr << "\n*** Machine instructions after INSTRUCTION SCHEDULING\n";
-      MachineCodeForMethod::get(method).dump();
-    }
+      if (SchedDebugLevel >= Sched_PrintMachineCode) {
+        cerr << "\n*** Machine instructions after INSTRUCTION SCHEDULING\n";
+        MachineCodeForMethod::get(M).dump();
+      }
   
-  return false;					 // no reason to fail yet
-}
-
+      return false;
+    }
+  };
+} // end anonymous namespace
 
+MethodPass *createInstructionSchedulingWithSSAPass(const TargetMachine &T) {
+  return new InstructionSchedulingWithSSA(T);
+}
diff --git a/lib/CodeGen/InstrSched/SchedPriorities.cpp b/lib/CodeGen/InstrSched/SchedPriorities.cpp
index 8cde252..9ed6cb9 100644
--- a/lib/CodeGen/InstrSched/SchedPriorities.cpp
+++ b/lib/CodeGen/InstrSched/SchedPriorities.cpp
@@ -19,21 +19,18 @@
 //**************************************************************************/
 
 #include "SchedPriorities.h"
+#include "llvm/Analysis/LiveVar/MethodLiveVarInfo.h"
 #include "Support/PostOrderIterator.h"
 #include <iostream>
 using std::cerr;
 
-SchedPriorities::SchedPriorities(const Method* method,
-				 const SchedGraph* _graph)
-  : curTime(0),
-    graph(_graph),
-    methodLiveVarInfo(method),	                          // expensive!
-    nodeDelayVec(_graph->getNumNodes(), INVALID_LATENCY), // make errors obvious
-    earliestForNode(_graph->getNumNodes(), 0),
+SchedPriorities::SchedPriorities(const Method *method, const SchedGraph *G,
+                                 MethodLiveVarInfo &LVI)
+  : curTime(0), graph(G), methodLiveVarInfo(LVI),
+    nodeDelayVec(G->getNumNodes(), INVALID_LATENCY), // make errors obvious
+    earliestForNode(G->getNumNodes(), 0),
     earliestReadyTime(0),
-    nextToTry(candsAsHeap.begin())
-{
-  methodLiveVarInfo.analyze();
+    nextToTry(candsAsHeap.begin()) {
   computeDelays(graph);
 }
 
diff --git a/lib/CodeGen/InstrSched/SchedPriorities.h b/lib/CodeGen/InstrSched/SchedPriorities.h
index 884a049..7cfc4c0 100644
--- a/lib/CodeGen/InstrSched/SchedPriorities.h
+++ b/lib/CodeGen/InstrSched/SchedPriorities.h
@@ -23,7 +23,6 @@
 
 #include "SchedGraph.h"
 #include "llvm/CodeGen/InstrScheduling.h"
-#include "llvm/Analysis/LiveVar/MethodLiveVarInfo.h"
 #include "llvm/Target/MachineSchedInfo.h"
 #include "Support/CommandLine.h"
 #include <list>
@@ -31,6 +30,7 @@
 class Method;
 class MachineInstr;
 class SchedulingManager;
+class MethodLiveVarInfo;
 
 //---------------------------------------------------------------------------
 // Debug option levels for instruction scheduling
@@ -124,8 +124,8 @@ private:
 
 class SchedPriorities: public NonCopyable {
 public:
-  /*ctor*/	SchedPriorities		(const Method* method,
-					 const SchedGraph* _graph);
+  SchedPriorities(const Method *M, const SchedGraph *G, MethodLiveVarInfo &LVI);
+                  
   
   // This must be called before scheduling begins.
   void		initialize		();
@@ -154,7 +154,7 @@ private:
 private:
   cycles_t curTime;
   const SchedGraph* graph;
-  MethodLiveVarInfo methodLiveVarInfo;
+  MethodLiveVarInfo &methodLiveVarInfo;
   std::hash_map<const MachineInstr*, bool> lastUseMap;
   std::vector<cycles_t> nodeDelayVec;
   std::vector<cycles_t> earliestForNode;