Revert r305677 [CodeGen] Add generic MacroFusion pass.

This causes Windows buildbot failures do an ambiguous call.

llvm-svn: 305681

1 files changed, 0 insertions, 150 deletions

diff --git a/llvm/lib/CodeGen/MacroFusion.cpp b/llvm/lib/CodeGen/MacroFusion.cpp
deleted file mode 100644
index d5c901c7645..00000000000
--- a/llvm/lib/CodeGen/MacroFusion.cpp
+++ /dev/null
@@ -1,150 +0,0 @@
-//===- MacroFusion.cpp - Macro Fusion ----------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-/// \file This file contains the implementation of the DAG scheduling mutation
-/// to pair instructions back to back.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/CodeGen/MacroFusion.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Target/TargetInstrInfo.h"
-
-#define DEBUG_TYPE "misched"
-
-STATISTIC(NumFused, "Number of instr pairs fused");
-
-using namespace llvm;
-
-static cl::opt<bool> EnableMacroFusion("misched-fusion", cl::Hidden,
-  cl::desc("Enable scheduling for macro fusion."), cl::init(true));
-
-namespace {
-
-static void fuseInstructionPair(ScheduleDAGMI &DAG, SUnit &FirstSU,
-                                SUnit &SecondSU) {
-  // Create a single weak edge between the adjacent instrs. The only effect is
-  // to cause bottom-up scheduling to heavily prioritize the clustered instrs.
-  DAG.addEdge(&SecondSU, SDep(&FirstSU, SDep::Cluster));
-
-  // Adjust the latency between the anchor instr and its
-  // predecessors.
-  for (SDep &IDep : SecondSU.Preds)
-    if (IDep.getSUnit() == &FirstSU)
-      IDep.setLatency(0);
-
-  // Adjust the latency between the dependent instr and its
-  // predecessors.
-  for (SDep &IDep : FirstSU.Succs)
-    if (IDep.getSUnit() == &SecondSU)
-      IDep.setLatency(0);
-
-  DEBUG(dbgs() << DAG.MF.getName() << "(): Macro fuse ";
-        FirstSU.print(dbgs(), &DAG); dbgs() << " - ";
-        SecondSU.print(dbgs(), &DAG); dbgs() << " /  ";
-        dbgs() << DAG.TII->getName(FirstSU.getInstr()->getOpcode()) << " - " <<
-                  DAG.TII->getName(SecondSU.getInstr()->getOpcode()) << '\n'; );
-
-  if (&SecondSU != &DAG.ExitSU)
-    // Make instructions dependent on FirstSU also dependent on SecondSU to
-    // prevent them from being scheduled between FirstSU and and SecondSU.
-    for (const SDep &SI : FirstSU.Succs) {
-      if (SI.getSUnit() == &SecondSU)
-        continue;
-      DEBUG(dbgs() << "  Copy Succ ";
-            SI.getSUnit()->print(dbgs(), &DAG); dbgs() << '\n';);
-      DAG.addEdge(SI.getSUnit(), SDep(&SecondSU, SDep::Artificial));
-    }
-
-  ++NumFused;
-}
-
-
-/// \brief Post-process the DAG to create cluster edges between instrs that may
-/// be fused by the processor into a single operation.
-class MacroFusion : public ScheduleDAGMutation {
-  ShouldSchedulePredTy shouldScheduleAdjacent;
-  bool FuseBlock;
-  bool scheduleAdjacentImpl(ScheduleDAGMI &DAG, SUnit &AnchorSU);
-
-public:
-  MacroFusion(ShouldSchedulePredTy shouldScheduleAdjacent, bool FuseBlock)
-    : shouldScheduleAdjacent(shouldScheduleAdjacent), FuseBlock(FuseBlock) {}
-
-  void apply(ScheduleDAGInstrs *DAGInstrs) override;
-};
-
-void MacroFusion::apply(ScheduleDAGInstrs *DAGInstrs) {
-  ScheduleDAGMI *DAG = static_cast<ScheduleDAGMI*>(DAGInstrs);
-
-  if (FuseBlock)
-    // For each of the SUnits in the scheduling block, try to fuse the instr in
-    // it with one in its predecessors.
-    for (SUnit &ISU : DAG->SUnits)
-        scheduleAdjacentImpl(*DAG, ISU);
-
-  if (DAG->ExitSU.getInstr())
-    // Try to fuse the instr in the ExitSU with one in its predecessors.
-    scheduleAdjacentImpl(*DAG, DAG->ExitSU);
-}
-
-/// \brief Implement the fusion of instr pairs in the scheduling DAG,
-/// anchored at the instr in AnchorSU..
-bool MacroFusion::scheduleAdjacentImpl(ScheduleDAGMI &DAG, SUnit &AnchorSU) {
-  const MachineInstr &AnchorMI = *AnchorSU.getInstr();
-  const TargetInstrInfo &TII = *DAG.TII;
-  const TargetSubtargetInfo &ST = DAG.MF.getSubtarget();
-
-  // Check if the anchor instr may be fused.
-  if (!shouldScheduleAdjacent(TII, ST, nullptr, AnchorMI))
-    return false;
-
-  // Explorer for fusion candidates among the dependencies of the anchor instr.
-  for (SDep &Dep : AnchorSU.Preds) {
-    // Ignore dependencies that don't enforce ordering.
-    if (Dep.getKind() == SDep::Anti || Dep.getKind() == SDep::Output ||
-        Dep.isWeak())
-      continue;
-
-    SUnit &DepSU = *Dep.getSUnit();
-    if (DepSU.isBoundaryNode())
-      continue;
-
-    const MachineInstr *DepMI = DepSU.getInstr();
-    if (!shouldScheduleAdjacent(TII, ST, DepMI, AnchorMI))
-      continue;
-
-    fuseInstructionPair(DAG, DepSU, AnchorSU);
-    return true;
-  }
-
-  return false;
-}
-
-} // end anonymous namespace
-
-
-namespace llvm {
-
-std::unique_ptr<ScheduleDAGMutation>
-createMacroFusionDAGMutation(ShouldSchedulePredTy shouldScheduleAdjacent) {
-  if(EnableMacroFusion)
-    return make_unique<MacroFusion>(shouldScheduleAdjacent, true);
-  return nullptr;
-}
-
-std::unique_ptr<ScheduleDAGMutation>
-createBranchMacroFusionDAGMutation(ShouldSchedulePredTy shouldScheduleAdjacent) {
-  if(EnableMacroFusion)
-    return make_unique<MacroFusion>(shouldScheduleAdjacent, false);
-  return nullptr;
-}
-
-} // end namespace llvm