lib/Target/BPF/BPFRegisterInfo.td

//===-- BPFRegisterInfo.td - BPF Register defs -------------*- tablegen -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

//===----------------------------------------------------------------------===//
//  Declarations that describe the BPF register file
//===----------------------------------------------------------------------===//

// Registers are identified with 4-bit ID numbers.
// Ri - 64-bit integer registers
class Ri<bits<16> Enc, string n> : Register<n> {
  let Namespace = "BPF";
  let HWEncoding = Enc;
}

// Integer registers
def R0 : Ri< 0, "r0">, DwarfRegNum<[0]>;
def R1 : Ri< 1, "r1">, DwarfRegNum<[1]>;
def R2 : Ri< 2, "r2">, DwarfRegNum<[2]>;
def R3 : Ri< 3, "r3">, DwarfRegNum<[3]>;
def R4 : Ri< 4, "r4">, DwarfRegNum<[4]>;
def R5 : Ri< 5, "r5">, DwarfRegNum<[5]>;
def R6 : Ri< 6, "r6">, DwarfRegNum<[6]>;
def R7 : Ri< 7, "r7">, DwarfRegNum<[7]>;
def R8 : Ri< 8, "r8">, DwarfRegNum<[8]>;
def R9 : Ri< 9, "r9">, DwarfRegNum<[9]>;
def R10 : Ri<10, "r10">, DwarfRegNum<[10]>;
def R11 : Ri<11, "r11">, DwarfRegNum<[11]>;

// Register classes.
def GPR : RegisterClass<"BPF", [i64], 64, (add R1, R2, R3, R4, R5,
                                           R6, R7, R8, R9, // callee saved
                                           R0,  // return value
                                           R11, // stack ptr
                                           R10  // frame ptr
                                          )>;