1//===- MipsCallingConv.td - Calling Conventions for Mips ---*- 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// This describes the calling conventions for Mips architecture.
10//===----------------------------------------------------------------------===//
11
12/// CCIfSubtarget - Match if the current subtarget has a feature F.
13class CCIfSubtarget<string F, CCAction A>:
14  CCIf<!strconcat("State.getTarget().getSubtarget<MipsSubtarget>().", F), A>;
15
16//===----------------------------------------------------------------------===//
17// Mips O32 Calling Convention
18//===----------------------------------------------------------------------===//
19
20// Only the return rules are defined here for O32. The rules for argument
21// passing are defined in MipsISelLowering.cpp.
22def RetCC_MipsO32 : CallingConv<[
23  // i32 are returned in registers V0, V1, A0, A1
24  CCIfType<[i32], CCAssignToReg<[V0, V1, A0, A1]>>,
25
26  // f32 are returned in registers F0, F2
27  CCIfType<[f32], CCAssignToReg<[F0, F2]>>,
28
29  // f64 are returned in register D0, D1
30  CCIfType<[f64], CCIfSubtarget<"isNotSingleFloat()", CCAssignToReg<[D0, D1]>>>
31]>;
32
33//===----------------------------------------------------------------------===//
34// Mips N32/64 Calling Convention
35//===----------------------------------------------------------------------===//
36
37def CC_MipsN : CallingConv<[
38   // Handles byval parameters.
39  CCIfByVal<CCCustom<"CC_Mips64Byval">>,
40
41  // Promote i8/i16/i32 arguments to i64.
42  CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
43
44  // Integer arguments are passed in integer registers.
45  CCIfType<[i64], CCAssignToRegWithShadow<[A0_64, A1_64, A2_64, A3_64,
46                                           T0_64, T1_64, T2_64, T3_64],
47                                          [D12_64, D13_64, D14_64, D15_64,
48                                           D16_64, D17_64, D18_64, D19_64]>>,
49
50  // f32 arguments are passed in single precision FP registers.
51  CCIfType<[f32], CCAssignToRegWithShadow<[F12, F13, F14, F15,
52                                           F16, F17, F18, F19],
53                                          [A0_64, A1_64, A2_64, A3_64,
54                                           T0_64, T1_64, T2_64, T3_64]>>,
55
56  // f64 arguments are passed in double precision FP registers.
57  CCIfType<[f64], CCAssignToRegWithShadow<[D12_64, D13_64, D14_64, D15_64,
58                                           D16_64, D17_64, D18_64, D19_64],
59                                          [A0_64, A1_64, A2_64, A3_64,
60                                           T0_64, T1_64, T2_64, T3_64]>>,
61
62  // All stack parameter slots become 64-bit doublewords and are 8-byte aligned.
63  CCIfType<[i64, f64], CCAssignToStack<8, 8>>,
64  CCIfType<[f32], CCAssignToStack<4, 8>>
65]>;
66
67// N32/64 variable arguments.
68// All arguments are passed in integer registers.
69def CC_MipsN_VarArg : CallingConv<[
70   // Handles byval parameters.
71  CCIfByVal<CCCustom<"CC_Mips64Byval">>,
72
73  // Promote i8/i16/i32 arguments to i64.
74  CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
75
76  CCIfType<[i64, f64], CCAssignToReg<[A0_64, A1_64, A2_64, A3_64,
77                                      T0_64, T1_64, T2_64, T3_64]>>,
78
79  CCIfType<[f32], CCAssignToReg<[A0, A1, A2, A3, T0, T1, T2, T3]>>,
80
81  // All stack parameter slots become 64-bit doublewords and are 8-byte aligned.
82  CCIfType<[i64, f64], CCAssignToStack<8, 8>>,
83  CCIfType<[f32], CCAssignToStack<4, 8>>
84]>;
85
86def RetCC_MipsN : CallingConv<[
87  // FIXME: Handle complex and float double return values.
88
89  // i32 are returned in registers V0, V1
90  CCIfType<[i32], CCAssignToReg<[V0, V1]>>,
91
92  // i64 are returned in registers V0_64, V1_64
93  CCIfType<[i64], CCAssignToReg<[V0_64, V1_64]>>,
94
95  // f32 are returned in registers F0, F2
96  CCIfType<[f32], CCAssignToReg<[F0, F2]>>,
97
98  // f64 are returned in registers D0, D2
99  CCIfType<[f64], CCAssignToReg<[D0_64, D2_64]>>
100]>;
101
102//===----------------------------------------------------------------------===//
103// Mips EABI Calling Convention
104//===----------------------------------------------------------------------===//
105
106def CC_MipsEABI : CallingConv<[
107  // Promote i8/i16 arguments to i32.
108  CCIfType<[i8, i16], CCPromoteToType<i32>>,
109
110  // Integer arguments are passed in integer registers.
111  CCIfType<[i32], CCAssignToReg<[A0, A1, A2, A3, T0, T1, T2, T3]>>,
112
113  // Single fp arguments are passed in pairs within 32-bit mode
114  CCIfType<[f32], CCIfSubtarget<"isSingleFloat()",
115                  CCAssignToReg<[F12, F13, F14, F15, F16, F17, F18, F19]>>>,
116
117  CCIfType<[f32], CCIfSubtarget<"isNotSingleFloat()",
118                  CCAssignToReg<[F12, F14, F16, F18]>>>,
119
120  // The first 4 double fp arguments are passed in single fp registers.
121  CCIfType<[f64], CCIfSubtarget<"isNotSingleFloat()",
122                  CCAssignToReg<[D6, D7, D8, D9]>>>,
123
124  // Integer values get stored in stack slots that are 4 bytes in
125  // size and 4-byte aligned.
126  CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
127
128  // Integer values get stored in stack slots that are 8 bytes in
129  // size and 8-byte aligned.
130  CCIfType<[f64], CCIfSubtarget<"isNotSingleFloat()", CCAssignToStack<8, 8>>>
131]>;
132
133def RetCC_MipsEABI : CallingConv<[
134  // i32 are returned in registers V0, V1
135  CCIfType<[i32], CCAssignToReg<[V0, V1]>>,
136
137  // f32 are returned in registers F0, F1
138  CCIfType<[f32], CCAssignToReg<[F0, F1]>>,
139
140  // f64 are returned in register D0
141  CCIfType<[f64], CCIfSubtarget<"isNotSingleFloat()", CCAssignToReg<[D0]>>>
142]>;
143
144//===----------------------------------------------------------------------===//
145// Mips Calling Convention Dispatch
146//===----------------------------------------------------------------------===//
147
148def CC_Mips : CallingConv<[
149  CCIfSubtarget<"isABI_EABI()", CCDelegateTo<CC_MipsEABI>>,
150  CCIfSubtarget<"isABI_N32()", CCDelegateTo<CC_MipsN>>,
151  CCIfSubtarget<"isABI_N64()", CCDelegateTo<CC_MipsN>>
152]>;
153
154def RetCC_Mips : CallingConv<[
155  CCIfSubtarget<"isABI_EABI()", CCDelegateTo<RetCC_MipsEABI>>,
156  CCIfSubtarget<"isABI_N32()", CCDelegateTo<RetCC_MipsN>>,
157  CCIfSubtarget<"isABI_N64()", CCDelegateTo<RetCC_MipsN>>,
158  CCDelegateTo<RetCC_MipsO32>
159]>;
160