1 files changed, 72 insertions, 0 deletions
diff --git a/llvm/lib/Target/Sparc/DelaySlotFiller.cpp b/llvm/lib/Target/Sparc/DelaySlotFiller.cpp
new file mode 100644
index 00000000000..2ef8ffef808
--- /dev/null
+++ b/llvm/lib/Target/Sparc/DelaySlotFiller.cpp
@@ -0,0 +1,72 @@
+//===-- DelaySlotFiller.cpp - SPARC delay slot filler ---------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+//
+// This is a simple local pass that fills delay slots with NOPs.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Sparc.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/ADT/Statistic.h"
+using namespace llvm;
+
+namespace {
+  Statistic<> FilledSlots("delayslotfiller", "Num. of delay slots filled");
+
+  struct Filler : public MachineFunctionPass {
+    /// Target machine description which we query for reg. names, data
+    /// layout, etc.
+    ///
+    TargetMachine &TM;
+    const TargetInstrInfo *TII;
+
+    Filler(TargetMachine &tm) : TM(tm), TII(tm.getInstrInfo()) { }
+
+    virtual const char *getPassName() const {
+      return "SPARC Delay Slot Filler";
+    }
+
+    bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
+    bool runOnMachineFunction(MachineFunction &F) {
+      bool Changed = false;
+      for (MachineFunction::iterator FI = F.begin(), FE = F.end();
+           FI != FE; ++FI)
+        Changed |= runOnMachineBasicBlock(*FI);
+      return Changed;
+    }
+
+  };
+} // end of anonymous namespace
+
+/// createSparcDelaySlotFillerPass - Returns a pass that fills in delay
+/// slots in Sparc MachineFunctions
+///
+FunctionPass *llvm::createSparcDelaySlotFillerPass(TargetMachine &tm) {
+  return new Filler(tm);
+}
+
+/// runOnMachineBasicBlock - Fill in delay slots for the given basic block.
+/// Currently, we fill delay slots with NOPs. We assume there is only one
+/// delay slot per delayed instruction.
+///
+bool Filler::runOnMachineBasicBlock(MachineBasicBlock &MBB) {
+  bool Changed = false;
+  for (MachineBasicBlock::iterator I = MBB.begin(); I != MBB.end(); ++I)
+    if (TII->hasDelaySlot(I->getOpcode())) {
+      MachineBasicBlock::iterator J = I;
+      ++J;
+      BuildMI(MBB, J, SP::NOP, 0);
+      ++FilledSlots;
+      Changed = true;
+    }
+  return Changed;
+}