MachineCSE: Hoist isConstantPhysReg out of the loop, it checks for overlaps already.

[oota-llvm.git] / lib / CodeGen / MachineTraceMetrics.cpp

diff --git a/lib/CodeGen/MachineTraceMetrics.cpp b/lib/CodeGen/MachineTraceMetrics.cpp
index c6a6d58ec2805f59f824ee4814a30e8bb5d75c7a..1a3aa609182585e79c3cfcaaa601ee40f259bc35 100644 (file)
--- a/lib/CodeGen/MachineTraceMetrics.cpp
+++ b/lib/CodeGen/MachineTraceMetrics.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "early-ifcvt"
+#define DEBUG_TYPE "machine-trace-metrics"
 #include "MachineTraceMetrics.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
@@ -1044,6 +1044,23 @@ MachineTraceMetrics::Trace::getInstrSlack(const MachineInstr *MI) const {
   return getCriticalPath() - (Cyc.Depth + Cyc.Height);
 }
 
+unsigned
+MachineTraceMetrics::Trace::getPHIDepth(const MachineInstr *PHI) const {
+  const MachineBasicBlock *MBB = TE.MTM.MF->getBlockNumbered(getBlockNum());
+  SmallVector<DataDep, 1> Deps;
+  getPHIDeps(PHI, Deps, MBB, TE.MTM.MRI);
+  assert(Deps.size() == 1 && "PHI doesn't have MBB as a predecessor");
+  DataDep &Dep = Deps.front();
+  unsigned DepCycle = getInstrCycles(Dep.DefMI).Depth;
+  // Add latency if DefMI is a real instruction. Transients get latency 0.
+  if (!Dep.DefMI->isTransient())
+    DepCycle += TE.MTM.TII->computeOperandLatency(TE.MTM.ItinData,
+                                                  Dep.DefMI, Dep.DefOp,
+                                                  PHI, Dep.UseOp,
+                                                  /* FindMin = */ false);
+  return DepCycle;
+}
+
 unsigned MachineTraceMetrics::Trace::getResourceDepth(bool Bottom) const {
   // For now, we compute the resource depth from instruction count / issue
   // width. Eventually, we should compute resource depth per functional unit
@@ -1058,6 +1075,18 @@ unsigned MachineTraceMetrics::Trace::getResourceDepth(bool Bottom) const {
   return Instrs;
 }
 
+unsigned MachineTraceMetrics::Trace::
+getResourceLength(ArrayRef<const MachineBasicBlock*> Extrablocks) const {
+  unsigned Instrs = TBI.InstrDepth + TBI.InstrHeight;
+  for (unsigned i = 0, e = Extrablocks.size(); i != e; ++i)
+    Instrs += TE.MTM.getResources(Extrablocks[i])->InstrCount;
+  if (const MCSchedModel *Model = TE.MTM.ItinData->SchedModel)
+    if (Model->IssueWidth != 0)
+      return Instrs / Model->IssueWidth;
+  // Assume issue width 1 without a schedule model.
+  return Instrs;
+}
+
 void MachineTraceMetrics::Ensemble::print(raw_ostream &OS) const {
   OS << getName() << " ensemble:\n";
   for (unsigned i = 0, e = BlockInfo.size(); i != e; ++i) {