1//===-- BPFRegisterInfo.td - BPF Register defs -------------*- tablegen -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10//===----------------------------------------------------------------------===//
11//  Declarations that describe the BPF register file
12//===----------------------------------------------------------------------===//
13
14let Namespace = "BPF" in {
15  def sub_32 : SubRegIndex<32>;
16}
17
18class Wi<bits<16> Enc, string n> : Register<n> {
19  let HWEncoding = Enc;
20  let Namespace = "BPF";
21}
22
23// Registers are identified with 4-bit ID numbers.
24// Ri - 64-bit integer registers
25class Ri<bits<16> Enc, string n, list<Register> subregs>
26  : RegisterWithSubRegs<n, subregs> {
27  let HWEncoding = Enc;
28  let Namespace = "BPF";
29  let SubRegIndices = [sub_32];
30}
31
32foreach I = 0-11 in {
33  // 32-bit Integer (alias to low part of 64-bit register).
34  def W#I  : Wi<I,  "w"#I>,  DwarfRegNum<[I]>;
35  // 64-bit Integer registers
36  def R#I  : Ri<I,  "r"#I,  [!cast<Wi>("W"#I)]>,  DwarfRegNum<[I]>;
37}
38
39// Register classes.
40def GPR32 : RegisterClass<"BPF", [i32], 32, (add
41  (sequence "W%u", 1, 9),
42  W0, // Return value
43  W11, // Stack Ptr
44  W10  // Frame Ptr
45)>;
46
47def GPR : RegisterClass<"BPF", [i64], 64, (add
48  (sequence "R%u", 1, 9),
49  R0, // Return value
50  R11, // Stack Ptr
51  R10  // Frame Ptr
52)>;
53