vendor/llvm/llvm-trunk-r161861

1 files changed, 111 insertions, 0 deletions

diff --git a/lib/Target/Mips/Mips16RegisterInfo.cpp b/lib/Target/Mips/Mips16RegisterInfo.cpp
new file mode 100644
index 000000000000..c15d1bf52e85
--- /dev/null
+++ b/lib/Target/Mips/Mips16RegisterInfo.cpp
@@ -0,0 +1,111 @@
+//===-- Mips16RegisterInfo.cpp - MIPS16 Register Information -== ----------===//
+//
+//                     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 MIPS16 implementation of the TargetRegisterInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Mips16RegisterInfo.h"
+#include "Mips.h"
+#include "MipsAnalyzeImmediate.h"
+#include "MipsInstrInfo.h"
+#include "MipsSubtarget.h"
+#include "MipsMachineFunction.h"
+#include "llvm/Constants.h"
+#include "llvm/DebugInfo.h"
+#include "llvm/Type.h"
+#include "llvm/Function.h"
+#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/STLExtras.h"
+
+using namespace llvm;
+
+Mips16RegisterInfo::Mips16RegisterInfo(const MipsSubtarget &ST,
+                                       const TargetInstrInfo &TII)
+  : MipsRegisterInfo(ST, TII) {}
+
+// This function eliminate ADJCALLSTACKDOWN,
+// ADJCALLSTACKUP pseudo instructions
+void Mips16RegisterInfo::
+eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+                              MachineBasicBlock::iterator I) const {
+  // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
+  MBB.erase(I);
+}
+
+void Mips16RegisterInfo::eliminateFI(MachineBasicBlock::iterator II,
+                                     unsigned OpNo, int FrameIndex,
+                                     uint64_t StackSize,
+                                     int64_t SPOffset) const {
+      MachineInstr &MI = *II;
+      MachineFunction &MF = *MI.getParent()->getParent();
+      MachineFrameInfo *MFI = MF.getFrameInfo();
+      MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
+
+      const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+      int MinCSFI = 0;
+      int MaxCSFI = -1;
+
+      if (CSI.size()) {
+        MinCSFI = CSI[0].getFrameIdx();
+        MaxCSFI = CSI[CSI.size() - 1].getFrameIdx();
+      }
+
+      // The following stack frame objects are always
+      // referenced relative to $sp:
+      //  1. Outgoing arguments.
+      //  2. Pointer to dynamically allocated stack space.
+      //  3. Locations for callee-saved registers.
+      // Everything else is referenced relative to whatever register
+      // getFrameRegister() returns.
+      unsigned FrameReg;
+
+      if (MipsFI->isOutArgFI(FrameIndex) ||
+         (FrameIndex >= MinCSFI && FrameIndex <= MaxCSFI))
+        FrameReg = Subtarget.isABI_N64() ? Mips::SP_64 : Mips::SP;
+      else
+        FrameReg = getFrameRegister(MF);
+
+      // Calculate final offset.
+      // - There is no need to change the offset if the frame object
+      //   is one of the
+      //   following: an outgoing argument, pointer to a dynamically allocated
+      //   stack space or a $gp restore location,
+      // - If the frame object is any of the following,
+      //   its offset must be adjusted
+      //   by adding the size of the stack:
+      //   incoming argument, callee-saved register location or local variable.
+      int64_t Offset;
+
+      if (MipsFI->isOutArgFI(FrameIndex))
+        Offset = SPOffset;
+      else
+        Offset = SPOffset + (int64_t)StackSize;
+
+      Offset    += MI.getOperand(OpNo + 1).getImm();
+
+      DEBUG(errs() << "Offset     : " << Offset << "\n" << "<--------->\n");
+
+      MI.getOperand(OpNo).ChangeToRegister(FrameReg, false);
+      MI.getOperand(OpNo + 1).ChangeToImmediate(Offset);
+
+
+}