Adds the X8664 register definition.

src/IceRegistersX8664.h

+//===- subzero/src/IceRegistersX8664.h - Register information ---*- C++ -*-===//
+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the registers and their encodings for x86-64.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_ICEREGISTERSX8664_H
+#define SUBZERO_SRC_ICEREGISTERSX8664_H
+
+#include "IceDefs.h"
+#include "IceInstX8664.def"
+#include "IceTypes.h"
+
+namespace Ice {
+
+namespace RegX8664 {
+
+// An enum of every register. The enum value may not match the encoding
+// used to binary encode register operands in instructions.
+enum AllRegisters {
+#define X(val, encode, name, name32, name16, name8, scratch, preserved,        \
+          stackptr, frameptr, isI8, isInt, isFP)                               \
+  val,
+  REGX8664_TABLE
+#undef X
+      Reg_NUM,
+#define X(val, init) val init,
+  REGX8664_TABLE_BOUNDS
+#undef X
+};
+
+// An enum of GPR Registers. The enum value does match the encoding used
+// to binary encode register operands in instructions.
+enum GPRRegister {
+#define X(val, encode, name, name32, name16, name8, scratch, preserved,        \
+          stackptr, frameptr, isI8, isInt, isFP)                               \
+  Encoded_##val encode,
+  REGX8664_GPR_TABLE
+#undef X
+      Encoded_Not_GPR = -1
+};
+
+// An enum of XMM Registers. The enum value does match the encoding used
+// to binary encode register operands in instructions.
+enum XmmRegister {
+#define X(val, encode, name, name32, name16, name8, scratch, preserved,        \
+          stackptr, frameptr, isI8, isInt, isFP)                               \
+  Encoded_##val encode,
+  REGX8664_XMM_TABLE
+#undef X
+      Encoded_Not_Xmm = -1
+};
+
+// An enum of Byte Registers. The enum value does match the encoding used
+// to binary encode register operands in instructions.
+enum ByteRegister {
+#define X(val, encode) Encoded_##val encode,
+  REGX8664_BYTEREG_TABLE
+#undef X
+      Encoded_Not_ByteReg = -1
+};
+
+static inline GPRRegister getEncodedGPR(int32_t RegNum) {
+  assert(Reg_GPR_First <= RegNum && RegNum <= Reg_GPR_Last);
+  return GPRRegister(RegNum - Reg_GPR_First);
+}
+
+static inline XmmRegister getEncodedXmm(int32_t RegNum) {
+  assert(Reg_XMM_First <= RegNum && RegNum <= Reg_XMM_Last);
+  return XmmRegister(RegNum - Reg_XMM_First);
+}
+
+static inline ByteRegister getEncodedByteReg(int32_t RegNum) {
+  // In x86-64, AH is not encodable when the REX prefix is used; the same
+  // encoding is used for spl. Therefore, ah needs special handling.
+  if (RegNum == Reg_ah)
+    return Encoded_Reg_spl;
+  return ByteRegister(RegNum - Reg_GPR_First);
+}
+
+static inline GPRRegister getEncodedByteRegOrGPR(Type Ty, int32_t RegNum) {
+  if (isByteSizedType(Ty))
+    return GPRRegister(getEncodedByteReg(RegNum));
+  else
+    return getEncodedGPR(RegNum);
+}
+
+} // end of namespace RegX8664
+
+} // end of namespace Ice
+
+#endif // SUBZERO_SRC_ICEREGISTERSX8664_H