1 //===-- MipsCallingConv.td - Calling Conventions for Mips --*- tablegen -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // This describes the calling conventions for Mips architecture.
10 //===----------------------------------------------------------------------===//
12 /// CCIfSubtarget - Match if the current subtarget has a feature F.
13 class CCIfSubtarget<string F, CCAction A, string Invert = "">
14 : CCIf<!strconcat(Invert,
15 "static_cast<const MipsSubtarget&>"
16 "(State.getMachineFunction().getSubtarget()).",
20 // The inverse of CCIfSubtarget
21 class CCIfSubtargetNot<string F, CCAction A> : CCIfSubtarget<F, A, "!">;
23 //===----------------------------------------------------------------------===//
24 // Mips O32 Calling Convention
25 //===----------------------------------------------------------------------===//
27 // Only the return rules are defined here for O32. The rules for argument
28 // passing are defined in MipsISelLowering.cpp.
29 def RetCC_MipsO32 : CallingConv<[
30 // i32 are returned in registers V0, V1, A0, A1
31 CCIfType<[i32], CCAssignToReg<[V0, V1, A0, A1]>>,
33 // f32 are returned in registers F0, F2
34 CCIfType<[f32], CCAssignToReg<[F0, F2]>>,
36 // f64 arguments are returned in D0_64 and D2_64 in FP64bit mode or
37 // in D0 and D1 in FP32bit mode.
38 CCIfType<[f64], CCIfSubtarget<"isFP64bit()", CCAssignToReg<[D0_64, D2_64]>>>,
39 CCIfType<[f64], CCIfSubtargetNot<"isFP64bit()", CCAssignToReg<[D0, D1]>>>
42 //===----------------------------------------------------------------------===//
43 // Mips N32/64 Calling Convention
44 //===----------------------------------------------------------------------===//
46 def CC_MipsN : CallingConv<[
47 // Promote i8/i16 arguments to i32.
48 CCIfType<[i8, i16], CCPromoteToType<i32>>,
50 // Integer arguments are passed in integer registers.
51 CCIfType<[i32], CCAssignToRegWithShadow<[A0, A1, A2, A3,
54 F16, F17, F18, F19]>>,
56 CCIfType<[i64], CCAssignToRegWithShadow<[A0_64, A1_64, A2_64, A3_64,
57 T0_64, T1_64, T2_64, T3_64],
58 [D12_64, D13_64, D14_64, D15_64,
59 D16_64, D17_64, D18_64, D19_64]>>,
61 // f32 arguments are passed in single precision FP registers.
62 CCIfType<[f32], CCAssignToRegWithShadow<[F12, F13, F14, F15,
64 [A0_64, A1_64, A2_64, A3_64,
65 T0_64, T1_64, T2_64, T3_64]>>,
67 // f64 arguments are passed in double precision FP registers.
68 CCIfType<[f64], CCAssignToRegWithShadow<[D12_64, D13_64, D14_64, D15_64,
69 D16_64, D17_64, D18_64, D19_64],
70 [A0_64, A1_64, A2_64, A3_64,
71 T0_64, T1_64, T2_64, T3_64]>>,
73 // All stack parameter slots become 64-bit doublewords and are 8-byte aligned.
74 CCIfType<[i32, f32], CCAssignToStack<4, 8>>,
75 CCIfType<[i64, f64], CCAssignToStack<8, 8>>
78 // N32/64 variable arguments.
79 // All arguments are passed in integer registers.
80 def CC_MipsN_VarArg : CallingConv<[
81 // Promote i8/i16 arguments to i32.
82 CCIfType<[i8, i16], CCPromoteToType<i32>>,
84 CCIfType<[i32, f32], CCAssignToReg<[A0, A1, A2, A3, T0, T1, T2, T3]>>,
86 CCIfType<[i64, f64], CCAssignToReg<[A0_64, A1_64, A2_64, A3_64,
87 T0_64, T1_64, T2_64, T3_64]>>,
89 // All stack parameter slots become 64-bit doublewords and are 8-byte aligned.
90 CCIfType<[i32, f32], CCAssignToStack<4, 8>>,
91 CCIfType<[i64, f64], CCAssignToStack<8, 8>>
94 def RetCC_MipsN : CallingConv<[
95 // Aggregate returns are positioned at the lowest address in the slot for
96 // both little and big-endian targets. When passing in registers, this
97 // requires that big-endian targets shift the value into the upper bits.
98 CCIfSubtarget<"isLittle()",
99 CCIfType<[i8, i16, i32], CCIfInReg<CCPromoteToType<i64>>>>,
100 CCIfSubtargetNot<"isLittle()",
101 CCIfType<[i8, i16, i32], CCIfInReg<CCPromoteToUpperBitsInType<i64>>>>,
103 // i32 are returned in registers V0, V1
104 CCIfType<[i32], CCAssignToReg<[V0, V1]>>,
106 // i64 are returned in registers V0_64, V1_64
107 CCIfType<[i64], CCAssignToReg<[V0_64, V1_64]>>,
109 // f32 are returned in registers F0, F2
110 CCIfType<[f32], CCAssignToReg<[F0, F2]>>,
112 // f64 are returned in registers D0, D2
113 CCIfType<[f64], CCAssignToReg<[D0_64, D2_64]>>
116 // For soft-float, f128 values are returned in A0_64 rather than V1_64.
117 def RetCC_F128SoftFloat : CallingConv<[
118 CCAssignToReg<[V0_64, A0_64]>
121 // For hard-float, f128 values are returned as a pair of f64's rather than a
123 def RetCC_F128HardFloat : CallingConv<[
124 CCBitConvertToType<f64>,
125 CCAssignToReg<[D0_64, D2_64]>
128 // Handle F128 specially since we can't identify the original type during the
129 // tablegen-erated code.
130 def RetCC_F128 : CallingConv<[
131 CCIfSubtarget<"abiUsesSoftFloat()",
132 CCIfType<[i64], CCDelegateTo<RetCC_F128SoftFloat>>>,
133 CCIfSubtargetNot<"abiUsesSoftFloat()",
134 CCIfType<[i64], CCDelegateTo<RetCC_F128HardFloat>>>
137 //===----------------------------------------------------------------------===//
138 // Mips EABI Calling Convention
139 //===----------------------------------------------------------------------===//
141 def CC_MipsEABI : CallingConv<[
142 // Promote i8/i16 arguments to i32.
143 CCIfType<[i8, i16], CCPromoteToType<i32>>,
145 // Integer arguments are passed in integer registers.
146 CCIfType<[i32], CCAssignToReg<[A0, A1, A2, A3, T0, T1, T2, T3]>>,
148 // Single fp arguments are passed in pairs within 32-bit mode
149 CCIfType<[f32], CCIfSubtarget<"isSingleFloat()",
150 CCAssignToReg<[F12, F13, F14, F15, F16, F17, F18, F19]>>>,
152 CCIfType<[f32], CCIfSubtargetNot<"isSingleFloat()",
153 CCAssignToReg<[F12, F14, F16, F18]>>>,
155 // The first 4 double fp arguments are passed in single fp registers.
156 CCIfType<[f64], CCIfSubtargetNot<"isSingleFloat()",
157 CCAssignToReg<[D6, D7, D8, D9]>>>,
159 // Integer values get stored in stack slots that are 4 bytes in
160 // size and 4-byte aligned.
161 CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
163 // Integer values get stored in stack slots that are 8 bytes in
164 // size and 8-byte aligned.
165 CCIfType<[f64], CCIfSubtargetNot<"isSingleFloat()", CCAssignToStack<8, 8>>>
168 def RetCC_MipsEABI : CallingConv<[
169 // i32 are returned in registers V0, V1
170 CCIfType<[i32], CCAssignToReg<[V0, V1]>>,
172 // f32 are returned in registers F0, F1
173 CCIfType<[f32], CCAssignToReg<[F0, F1]>>,
175 // f64 are returned in register D0
176 CCIfType<[f64], CCIfSubtargetNot<"isSingleFloat()", CCAssignToReg<[D0]>>>
179 //===----------------------------------------------------------------------===//
180 // Mips FastCC Calling Convention
181 //===----------------------------------------------------------------------===//
182 def CC_MipsO32_FastCC : CallingConv<[
183 // f64 arguments are passed in double-precision floating pointer registers.
184 CCIfType<[f64], CCIfSubtargetNot<"isFP64bit()",
185 CCAssignToReg<[D0, D1, D2, D3, D4, D5, D6,
187 CCIfType<[f64], CCIfSubtarget<"isFP64bit()", CCIfSubtarget<"useOddSPReg()",
188 CCAssignToReg<[D0_64, D1_64, D2_64, D3_64,
189 D4_64, D5_64, D6_64, D7_64,
190 D8_64, D9_64, D10_64, D11_64,
191 D12_64, D13_64, D14_64, D15_64,
192 D16_64, D17_64, D18_64,
194 CCIfType<[f64], CCIfSubtarget<"isFP64bit()", CCIfSubtarget<"noOddSPReg()",
195 CCAssignToReg<[D0_64, D2_64, D4_64, D6_64,
196 D8_64, D10_64, D12_64, D14_64,
199 // Stack parameter slots for f64 are 64-bit doublewords and 8-byte aligned.
200 CCIfType<[f64], CCAssignToStack<8, 8>>
203 def CC_MipsN_FastCC : CallingConv<[
204 // Integer arguments are passed in integer registers.
205 CCIfType<[i64], CCAssignToReg<[A0_64, A1_64, A2_64, A3_64, T0_64, T1_64,
206 T2_64, T3_64, T4_64, T5_64, T6_64, T7_64,
209 // f64 arguments are passed in double-precision floating pointer registers.
210 CCIfType<[f64], CCAssignToReg<[D0_64, D1_64, D2_64, D3_64, D4_64, D5_64,
211 D6_64, D7_64, D8_64, D9_64, D10_64, D11_64,
212 D12_64, D13_64, D14_64, D15_64, D16_64, D17_64,
215 // Stack parameter slots for i64 and f64 are 64-bit doublewords and
217 CCIfType<[i64, f64], CCAssignToStack<8, 8>>
220 def CC_Mips_FastCC : CallingConv<[
221 // Handles byval parameters.
222 CCIfByVal<CCPassByVal<4, 4>>,
224 // Promote i8/i16 arguments to i32.
225 CCIfType<[i8, i16], CCPromoteToType<i32>>,
227 // Integer arguments are passed in integer registers. All scratch registers,
228 // except for AT, V0 and T9, are available to be used as argument registers.
229 CCIfType<[i32], CCIfSubtargetNot<"isTargetNaCl()",
230 CCAssignToReg<[A0, A1, A2, A3, T0, T1, T2, T3, T4, T5, T6, T7, T8, V1]>>>,
232 // In NaCl, T6, T7 and T8 are reserved and not available as argument
233 // registers for fastcc. T6 contains the mask for sandboxing control flow
234 // (indirect jumps and calls). T7 contains the mask for sandboxing memory
235 // accesses (loads and stores). T8 contains the thread pointer.
236 CCIfType<[i32], CCIfSubtarget<"isTargetNaCl()",
237 CCAssignToReg<[A0, A1, A2, A3, T0, T1, T2, T3, T4, T5, V1]>>>,
239 // f32 arguments are passed in single-precision floating pointer registers.
240 CCIfType<[f32], CCIfSubtarget<"useOddSPReg()",
241 CCAssignToReg<[F0, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, F13,
242 F14, F15, F16, F17, F18, F19]>>>,
244 // Don't use odd numbered single-precision registers for -mno-odd-spreg.
245 CCIfType<[f32], CCIfSubtarget<"noOddSPReg()",
246 CCAssignToReg<[F0, F2, F4, F6, F8, F10, F12, F14, F16, F18]>>>,
248 // Stack parameter slots for i32 and f32 are 32-bit words and 4-byte aligned.
249 CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
251 CCIfSubtarget<"isABI_EABI()", CCDelegateTo<CC_MipsEABI>>,
252 CCIfSubtarget<"isABI_O32()", CCDelegateTo<CC_MipsO32_FastCC>>,
253 CCDelegateTo<CC_MipsN_FastCC>
258 def CC_Mips16RetHelper : CallingConv<[
259 // Integer arguments are passed in integer registers.
260 CCIfType<[i32], CCAssignToReg<[V0, V1, A0, A1]>>
263 //===----------------------------------------------------------------------===//
264 // Mips Calling Convention Dispatch
265 //===----------------------------------------------------------------------===//
267 def RetCC_Mips : CallingConv<[
268 CCIfSubtarget<"isABI_EABI()", CCDelegateTo<RetCC_MipsEABI>>,
269 CCIfSubtarget<"isABI_N32()", CCDelegateTo<RetCC_MipsN>>,
270 CCIfSubtarget<"isABI_N64()", CCDelegateTo<RetCC_MipsN>>,
271 CCDelegateTo<RetCC_MipsO32>
274 //===----------------------------------------------------------------------===//
275 // Callee-saved register lists.
276 //===----------------------------------------------------------------------===//
278 def CSR_SingleFloatOnly : CalleeSavedRegs<(add (sequence "F%u", 31, 20), RA, FP,
279 (sequence "S%u", 7, 0))>;
281 def CSR_O32_FPXX : CalleeSavedRegs<(add (sequence "D%u", 15, 10), RA, FP,
282 (sequence "S%u", 7, 0))> {
283 let OtherPreserved = (add (decimate (sequence "F%u", 30, 20), 2));
286 def CSR_O32 : CalleeSavedRegs<(add (sequence "D%u", 15, 10), RA, FP,
287 (sequence "S%u", 7, 0))>;
290 CalleeSavedRegs<(add (decimate (sequence "D%u_64", 30, 20), 2), RA, FP,
291 (sequence "S%u", 7, 0))>;
293 def CSR_N32 : CalleeSavedRegs<(add D20_64, D22_64, D24_64, D26_64, D28_64,
294 D30_64, RA_64, FP_64, GP_64,
295 (sequence "S%u_64", 7, 0))>;
297 def CSR_N64 : CalleeSavedRegs<(add (sequence "D%u_64", 31, 24), RA_64, FP_64,
298 GP_64, (sequence "S%u_64", 7, 0))>;
300 def CSR_Mips16RetHelper :
301 CalleeSavedRegs<(add V0, V1, FP,
302 (sequence "A%u", 3, 0), (sequence "S%u", 7, 0),
303 (sequence "D%u", 15, 10))>;