[PATCH] [RFC][7/17]TILE-Gx: support pseduo instruction expanding for tilegx

[Jiong WANG]

  add the patch. (do not know why it's not included in previous post, my editing time is too long?)

http://llvm-reviews.chandlerc.com/D517

Files:
  lib/Target/Tile/TileExpandPseudo.cpp

Index: lib/Target/Tile/TileExpandPseudo.cpp
===================================================================
--- /dev/null
+++ lib/Target/Tile/TileExpandPseudo.cpp
@@ -0,0 +1,113 @@
+//===--  TileExpandPseudo.cpp - Expand Pseudo Instructions ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass expands pseudo instructions into target instructions after register
+// allocation but before post-RA scheduling.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "tile-expand-pseudo"
+
+#include "Tile.h"
+#include "TileTargetMachine.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/ADT/Statistic.h"
+
+using namespace llvm;
+
+namespace {
+  struct TileExpandPseudo : public MachineFunctionPass {
+
+    TargetMachine &TM;
+    const TargetInstrInfo *TII;
+
+    static char ID;
+    TileExpandPseudo(TargetMachine &tm)
+      : MachineFunctionPass(ID), TM(tm), TII(tm.getInstrInfo()) { }
+
+    virtual const char *getPassName() const {
+      return "Tile PseudoInstrs Expansion";
+    }
+
+    bool runOnMachineFunction(MachineFunction &F);
+    bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
+
+  private:
+    void ExpandBuildPairF64(MachineBasicBlock&, MachineBasicBlock::iterator);
+    void ExpandExtractElementF64(MachineBasicBlock&,
+                                 MachineBasicBlock::iterator);
+  };
+  char TileExpandPseudo::ID = 0;
+} // end of anonymous namespace
+
+bool TileExpandPseudo::runOnMachineFunction(MachineFunction& F) {
+  bool Changed = false;
+
+  for (MachineFunction::iterator I = F.begin(); I != F.end(); ++I)
+    Changed |= runOnMachineBasicBlock(*I);
+
+  return Changed;
+}
+
+bool TileExpandPseudo::runOnMachineBasicBlock(MachineBasicBlock& MBB) {
+
+  bool Changed = false;
+  MachineFunction &MF = *MBB.getParent();
+  MachineFrameInfo *MFI = MF.getFrameInfo();
+  TileFunctionInfo *TFI = MF.getInfo<TileFunctionInfo>();
+  for (MachineBasicBlock::iterator I = MBB.begin(); I != MBB.end();) {
+    const MCInstrDesc& MCid = I->getDesc();
+
+    switch(MCid.getOpcode()) {
+    default:
+      ++I;
+      continue;
+    case Tile::VAARG_SP:
+      BuildMI(MBB, I, I->getDebugLoc(), TII->get(Tile::ADDLI),
+	      I->getOperand(0).getReg())
+             .addReg(I->getOperand(1).getReg())
+             .addImm(MFI->getStackSize() + MFI->getOffsetAdjustment());
+      break;
+
+    // The addr alloca returned should by adjusted by the size
+    // of Tile 16bytes zone and arg outgoing zone.
+    case Tile::ALLOCA_ADDR:
+      BuildMI(MBB, I, I->getDebugLoc(), TII->get(Tile::ADDLI)
+              ,I->getOperand(0).getReg())
+              .addReg(I->getOperand(1).getReg())
+              .addImm(TFI->getMaxCallFrameSize() + (MFI->hasCalls() ? 16 : 0));
+      break;
+
+    case Tile::ALLOCA_SP:
+      unsigned src_sp = Tile::SP;
+      if (MFI->hasCalls())
+        src_sp = I->getOperand(2).getReg();
+
+      BuildMI(MBB, I, I->getDebugLoc(), TII->get(Tile::ADD)
+              ,I->getOperand(0).getReg())
+              .addReg(Tile::ZERO)
+              .addReg(src_sp);
+      break;
+
+    }
+
+    // Delete original instr.
+    MBB.erase(I++);
+    Changed = true;
+  }
+
+  return Changed;
+}
+
+/// Returns a pass that expands pseudo instrs into real instrs.
+FunctionPass *llvm::createTileExpandPseudoPass(TileTargetMachine &tm) {
+  return new TileExpandPseudo(tm);
+}
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