1 files changed, 80 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/Sparc/SparcFrameLowering.cpp b/contrib/llvm/lib/Target/Sparc/SparcFrameLowering.cpp
new file mode 100644
index 0000000..320c8ca
--- /dev/null
+++ b/contrib/llvm/lib/Target/Sparc/SparcFrameLowering.cpp
@@ -0,0 +1,80 @@
+//====- SparcFrameLowering.cpp - Sparc Frame Information -------*- C++ -*-====//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the Sparc implementation of TargetFrameLowering class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "SparcFrameLowering.h"
+#include "SparcInstrInfo.h"
+#include "SparcMachineFunctionInfo.h"
+#include "llvm/Function.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Support/CommandLine.h"
+
+using namespace llvm;
+
+void SparcFrameLowering::emitPrologue(MachineFunction &MF) const {
+  MachineBasicBlock &MBB = MF.front();
+  MachineFrameInfo *MFI = MF.getFrameInfo();
+  const SparcInstrInfo &TII =
+    *static_cast<const SparcInstrInfo*>(MF.getTarget().getInstrInfo());
+  MachineBasicBlock::iterator MBBI = MBB.begin();
+  DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
+
+  // Get the number of bytes to allocate from the FrameInfo
+  int NumBytes = (int) MFI->getStackSize();
+
+  // Emit the correct save instruction based on the number of bytes in
+  // the frame. Minimum stack frame size according to V8 ABI is:
+  //   16 words for register window spill
+  //    1 word for address of returned aggregate-value
+  // +  6 words for passing parameters on the stack
+  // ----------
+  //   23 words * 4 bytes per word = 92 bytes
+  NumBytes += 92;
+
+  // Round up to next doubleword boundary -- a double-word boundary
+  // is required by the ABI.
+  NumBytes = (NumBytes + 7) & ~7;
+  NumBytes = -NumBytes;
+
+  if (NumBytes >= -4096) {
+    BuildMI(MBB, MBBI, dl, TII.get(SP::SAVEri), SP::O6)
+      .addReg(SP::O6).addImm(NumBytes);
+  } else {
+    // Emit this the hard way.  This clobbers G1 which we always know is
+    // available here.
+    unsigned OffHi = (unsigned)NumBytes >> 10U;
+    BuildMI(MBB, MBBI, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi);
+    // Emit G1 = G1 + I6
+    BuildMI(MBB, MBBI, dl, TII.get(SP::ORri), SP::G1)
+      .addReg(SP::G1).addImm(NumBytes & ((1 << 10)-1));
+    BuildMI(MBB, MBBI, dl, TII.get(SP::SAVErr), SP::O6)
+      .addReg(SP::O6).addReg(SP::G1);
+  }
+}
+
+void SparcFrameLowering::emitEpilogue(MachineFunction &MF,
+                                  MachineBasicBlock &MBB) const {
+  MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
+  const SparcInstrInfo &TII =
+    *static_cast<const SparcInstrInfo*>(MF.getTarget().getInstrInfo());
+  DebugLoc dl = MBBI->getDebugLoc();
+  assert(MBBI->getOpcode() == SP::RETL &&
+         "Can only put epilog before 'retl' instruction!");
+  BuildMI(MBB, MBBI, dl, TII.get(SP::RESTORErr), SP::G0).addReg(SP::G0)
+    .addReg(SP::G0);
+}