1//===-- CSKYCallingConv.td - Calling Conventions CSKY ----*- tablegen -*---===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This describes the calling conventions for the CSKY architecture.
10//
11//===----------------------------------------------------------------------===//
12
13def CSR_I32 : CalleeSavedRegs<(add R8, R15, (sequence "R%u", 4, 7),
14  (sequence "R%u", 9, 11), (sequence "R%u", 16, 17), R28)>;
15def CSR_GPR_FPR32 : CalleeSavedRegs<(add CSR_I32, (sequence "F%u_32", 8, 15))>;
16def CSR_GPR_FPR64 : CalleeSavedRegs<(add CSR_I32,
17                                    (sequence "F%u_64", 8, 15))>;
18
19// Interrupt handler needs to save/restore all registers that are used,
20// both Caller and Callee saved registers.
21def CSR_GPR_ISR : CalleeSavedRegs<(add R8, R15,
22    (sequence "R%u", 0, 3),
23    (sequence "R%u", 4, 7),
24    (sequence "R%u", 9, 13),
25    (sequence "R%u", 16, 31))>;
26
27def CSR_GPR_FPR32_ISR: CalleeSavedRegs<(add CSR_GPR_ISR,
28    (sequence "F%u_32", 0, 15))>;
29def CSR_GPR_FPR64_ISR: CalleeSavedRegs<(add CSR_GPR_ISR,
30    (sequence "F%u_64", 0, 15))>;
31
32def CSR_GPR_FPR32v3_ISR: CalleeSavedRegs<(add CSR_GPR_FPR32_ISR,
33    (sequence "F%u_32", 16, 31))>;
34def CSR_GPR_FPR64v3_ISR: CalleeSavedRegs<(add CSR_GPR_FPR64_ISR,
35    (sequence "F%u_64", 16, 31))>;
36
37// Needed for implementation of CSKYRegisterInfo::getNoPreservedMask()
38def CSR_NoRegs : CalleeSavedRegs<(add)>;
39
40def CC_CSKY_ABIV2_SOFT : CallingConv<[
41  // DSP types
42  CCIfType<[v2i16, v4i8], CCAssignToReg<[R0, R1, R2, R3]>>,
43  CCIfType<[v2i16, v4i8], CCAssignToStack<4, 4>>,
44  CCIfType<[i8, i16], CCPromoteToType<i32>>,
45  CCIfType<[f32], CCAssignToReg<[R0, R1, R2, R3]>>,
46  CCIfType<[f32], CCAssignToStack<4, 4>>,
47  CCIfType<[i32], CCAssignToReg<[R0, R1, R2, R3]>>,
48  CCIfType<[i32], CCAssignToStack<4, 4>>,
49  CCIfType<[f64], CCCustom<"CC_CSKY_ABIV2_SOFT_64">>,
50  CCIfType<[f64], CCAssignToStack<8, 4>>
51]>;
52
53def RetCC_CSKY_ABIV2_SOFT : CallingConv<[
54  // DSP types
55  CCIfType<[v2i16, v4i8], CCAssignToReg<[R0, R1]>>,
56  CCIfType<[i8, i16], CCPromoteToType<i32>>,
57  CCIfType<[f32], CCBitConvertToType<i32>>,
58  CCIfType<[i32], CCAssignToReg<[R0, R1]>>,
59  CCIfType<[f64], CCCustom<"Ret_CSKY_ABIV2_SOFT_64">>
60]>;
61
62def CC_CSKY_ABIV2_FP : CallingConv<[
63  // DSP types
64  CCIfType<[v2i16, v4i8], CCAssignToReg<[R0, R1, R2, R3]>>,
65  CCIfType<[v2i16, v4i8], CCAssignToStack<4, 4>>,
66  CCIfType<[i8, i16], CCPromoteToType<i32>>,
67  CCIfType<[i32], CCAssignToReg<[R0, R1, R2, R3]>>,
68  CCIfType<[i32], CCAssignToStack<4, 4>>,
69  CCIfType<[f32], CCAssignToReg<[F0_32, F1_32, F2_32, F3_32]>>,
70  CCIfType<[f32], CCAssignToStack<4, 4>>,
71  CCIfType<[f64], CCAssignToReg<[F0_64, F1_64, F2_64, F3_64]>>,
72  CCIfType<[f64], CCAssignToStack<8, 4>>
73]>;
74
75def RetCC_CSKY_ABIV2_FP : CallingConv<[
76  // DSP types
77  CCIfType<[v2i16, v4i8], CCAssignToReg<[R0, R1]>>,
78  CCIfType<[i8, i16], CCPromoteToType<i32>>,
79  CCIfType<[i32], CCAssignToReg<[R0, R1]>>,
80  CCIfType<[f32], CCAssignToReg<[F0_32]>>,
81  CCIfType<[f64], CCAssignToReg<[F0_64]>>
82]>;
83