1 //=- AArch64CallingConv.td - Calling Conventions for AArch64 -*- tablegen -*-=//
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
7 //===----------------------------------------------------------------------===//
9 // This describes the calling conventions for AArch64 architecture.
11 //===----------------------------------------------------------------------===//
13 /// CCIfBigEndian - Match only if we're in big endian mode.
14 class CCIfBigEndian<CCAction A> :
15 CCIf<"State.getMachineFunction().getDataLayout().isBigEndian()", A>;
17 class CCIfILP32<CCAction A> :
18 CCIf<"State.getMachineFunction().getDataLayout().getPointerSize() == 4", A>;
21 //===----------------------------------------------------------------------===//
22 // ARM AAPCS64 Calling Convention
23 //===----------------------------------------------------------------------===//
26 def CC_AArch64_AAPCS : CallingConv<[
27 CCIfType<[iPTR], CCBitConvertToType<i64>>,
28 CCIfType<[v2f32], CCBitConvertToType<v2i32>>,
29 CCIfType<[v2f64, v4f32], CCBitConvertToType<v2i64>>,
31 // Big endian vectors must be passed as if they were 1-element vectors so that
32 // their lanes are in a consistent order.
33 CCIfBigEndian<CCIfType<[v2i32, v2f32, v4i16, v4f16, v4bf16, v8i8],
34 CCBitConvertToType<f64>>>,
35 CCIfBigEndian<CCIfType<[v2i64, v2f64, v4i32, v4f32, v8i16, v8f16, v8bf16, v16i8],
36 CCBitConvertToType<f128>>>,
38 // In AAPCS, an SRet is passed in X8, not X0 like a normal pointer parameter.
39 // However, on windows, in some circumstances, the SRet is passed in X0 or X1
40 // instead. The presence of the inreg attribute indicates that SRet is
41 // passed in the alternative register (X0 or X1), not X8:
42 // - X0 for non-instance methods.
43 // - X1 for instance methods.
45 // The "sret" attribute identifies indirect returns.
46 // The "inreg" attribute identifies non-aggregate types.
47 // The position of the "sret" attribute identifies instance/non-instance
49 // "sret" on argument 0 means non-instance methods.
50 // "sret" on argument 1 means instance methods.
52 CCIfInReg<CCIfType<[i64],
53 CCIfSRet<CCIfType<[i64], CCAssignToRegWithShadow<[X0, X1], [W0, W1]>>>>>,
55 CCIfSRet<CCIfType<[i64], CCAssignToRegWithShadow<[X8], [W8]>>>,
57 // Put ByVal arguments directly on the stack. Minimum size and alignment of a
59 CCIfByVal<CCPassByVal<8, 8>>,
61 // The 'nest' parameter, if any, is passed in X18.
62 // Darwin uses X18 as the platform register and hence 'nest' isn't currently
64 CCIfNest<CCAssignToReg<[X18]>>,
66 // Pass SwiftSelf in a callee saved register.
67 CCIfSwiftSelf<CCIfType<[i64], CCAssignToRegWithShadow<[X20], [W20]>>>,
69 // A SwiftError is passed in X21.
70 CCIfSwiftError<CCIfType<[i64], CCAssignToRegWithShadow<[X21], [W21]>>>,
72 CCIfConsecutiveRegs<CCCustom<"CC_AArch64_Custom_Block">>,
74 CCIfType<[nxv16i8, nxv8i16, nxv4i32, nxv2i64, nxv2f16, nxv4f16, nxv8f16,
75 nxv2bf16, nxv4bf16, nxv8bf16, nxv2f32, nxv4f32, nxv2f64],
76 CCAssignToReg<[Z0, Z1, Z2, Z3, Z4, Z5, Z6, Z7]>>,
77 CCIfType<[nxv16i8, nxv8i16, nxv4i32, nxv2i64, nxv2f16, nxv4f16, nxv8f16,
78 nxv2bf16, nxv4bf16, nxv8bf16, nxv2f32, nxv4f32, nxv2f64],
81 CCIfType<[nxv2i1, nxv4i1, nxv8i1, nxv16i1],
82 CCAssignToReg<[P0, P1, P2, P3]>>,
83 CCIfType<[nxv2i1, nxv4i1, nxv8i1, nxv16i1],
86 // Handle i1, i8, i16, i32, i64, f32, f64 and v2f64 by passing in registers,
87 // up to eight each of GPR and FPR.
88 CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,
89 CCIfType<[i32], CCAssignToRegWithShadow<[W0, W1, W2, W3, W4, W5, W6, W7],
90 [X0, X1, X2, X3, X4, X5, X6, X7]>>,
91 // i128 is split to two i64s, we can't fit half to register X7.
92 CCIfType<[i64], CCIfSplit<CCAssignToRegWithShadow<[X0, X2, X4, X6],
95 // i128 is split to two i64s, and its stack alignment is 16 bytes.
96 CCIfType<[i64], CCIfSplit<CCAssignToStackWithShadow<8, 16, [X7]>>>,
98 CCIfType<[i64], CCAssignToRegWithShadow<[X0, X1, X2, X3, X4, X5, X6, X7],
99 [W0, W1, W2, W3, W4, W5, W6, W7]>>,
100 CCIfType<[f16], CCAssignToRegWithShadow<[H0, H1, H2, H3, H4, H5, H6, H7],
101 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
102 CCIfType<[bf16], CCAssignToRegWithShadow<[H0, H1, H2, H3, H4, H5, H6, H7],
103 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
104 CCIfType<[f32], CCAssignToRegWithShadow<[S0, S1, S2, S3, S4, S5, S6, S7],
105 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
106 CCIfType<[f64], CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
107 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
108 CCIfType<[v1i64, v2i32, v4i16, v8i8, v1f64, v2f32, v4f16, v4bf16],
109 CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
110 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
111 CCIfType<[f128, v2i64, v4i32, v8i16, v16i8, v4f32, v2f64, v8f16, v8bf16],
112 CCAssignToReg<[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
114 // If more than will fit in registers, pass them on the stack instead.
115 CCIfType<[i1, i8, i16, f16, bf16], CCAssignToStack<8, 8>>,
116 CCIfType<[i32, f32], CCAssignToStack<8, 8>>,
117 CCIfType<[i64, f64, v1f64, v2f32, v1i64, v2i32, v4i16, v8i8, v4f16, v4bf16],
118 CCAssignToStack<8, 8>>,
119 CCIfType<[f128, v2i64, v4i32, v8i16, v16i8, v4f32, v2f64, v8f16, v8bf16],
120 CCAssignToStack<16, 16>>
124 def RetCC_AArch64_AAPCS : CallingConv<[
125 CCIfType<[iPTR], CCBitConvertToType<i64>>,
126 CCIfType<[v2f32], CCBitConvertToType<v2i32>>,
127 CCIfType<[v2f64, v4f32], CCBitConvertToType<v2i64>>,
129 CCIfConsecutiveRegs<CCCustom<"CC_AArch64_Custom_Block">>,
130 CCIfSwiftError<CCIfType<[i64], CCAssignToRegWithShadow<[X21], [W21]>>>,
132 // Big endian vectors must be passed as if they were 1-element vectors so that
133 // their lanes are in a consistent order.
134 CCIfBigEndian<CCIfType<[v2i32, v2f32, v4i16, v4f16, v4bf16, v8i8],
135 CCBitConvertToType<f64>>>,
136 CCIfBigEndian<CCIfType<[v2i64, v2f64, v4i32, v4f32, v8i16, v8f16, v8bf16, v16i8],
137 CCBitConvertToType<f128>>>,
139 CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,
140 CCIfType<[i32], CCAssignToRegWithShadow<[W0, W1, W2, W3, W4, W5, W6, W7],
141 [X0, X1, X2, X3, X4, X5, X6, X7]>>,
142 CCIfType<[i64], CCAssignToRegWithShadow<[X0, X1, X2, X3, X4, X5, X6, X7],
143 [W0, W1, W2, W3, W4, W5, W6, W7]>>,
144 CCIfType<[f16], CCAssignToRegWithShadow<[H0, H1, H2, H3, H4, H5, H6, H7],
145 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
146 CCIfType<[bf16], CCAssignToRegWithShadow<[H0, H1, H2, H3, H4, H5, H6, H7],
147 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
148 CCIfType<[f32], CCAssignToRegWithShadow<[S0, S1, S2, S3, S4, S5, S6, S7],
149 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
150 CCIfType<[f64], CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
151 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
152 CCIfType<[v1i64, v2i32, v4i16, v8i8, v1f64, v2f32, v4f16, v4bf16],
153 CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
154 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
155 CCIfType<[f128, v2i64, v4i32, v8i16, v16i8, v4f32, v2f64, v8f16, v8bf16],
156 CCAssignToReg<[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
158 CCIfType<[nxv16i8, nxv8i16, nxv4i32, nxv2i64, nxv2f16, nxv4f16, nxv8f16,
159 nxv2bf16, nxv4bf16, nxv8bf16, nxv2f32, nxv4f32, nxv2f64],
160 CCAssignToReg<[Z0, Z1, Z2, Z3, Z4, Z5, Z6, Z7]>>,
162 CCIfType<[nxv2i1, nxv4i1, nxv8i1, nxv16i1],
163 CCAssignToReg<[P0, P1, P2, P3]>>
166 // Vararg functions on windows pass floats in integer registers
168 def CC_AArch64_Win64_VarArg : CallingConv<[
169 CCIfType<[f16, bf16, f32], CCPromoteToType<f64>>,
170 CCIfType<[f64], CCBitConvertToType<i64>>,
171 CCDelegateTo<CC_AArch64_AAPCS>
174 // Windows Control Flow Guard checks take a single argument (the target function
175 // address) and have no return value.
177 def CC_AArch64_Win64_CFGuard_Check : CallingConv<[
178 CCIfType<[i64], CCAssignToReg<[X15]>>
182 // Darwin uses a calling convention which differs in only two ways
183 // from the standard one at this level:
184 // + i128s (i.e. split i64s) don't need even registers.
185 // + Stack slots are sized as needed rather than being at least 64-bit.
187 def CC_AArch64_DarwinPCS : CallingConv<[
188 CCIfType<[iPTR], CCBitConvertToType<i64>>,
189 CCIfType<[v2f32], CCBitConvertToType<v2i32>>,
190 CCIfType<[v2f64, v4f32, f128], CCBitConvertToType<v2i64>>,
192 // An SRet is passed in X8, not X0 like a normal pointer parameter.
193 CCIfSRet<CCIfType<[i64], CCAssignToRegWithShadow<[X8], [W8]>>>,
195 // Put ByVal arguments directly on the stack. Minimum size and alignment of a
197 CCIfByVal<CCPassByVal<8, 8>>,
199 // Pass SwiftSelf in a callee saved register.
200 CCIfSwiftSelf<CCIfType<[i64], CCAssignToRegWithShadow<[X20], [W20]>>>,
202 // A SwiftError is passed in X21.
203 CCIfSwiftError<CCIfType<[i64], CCAssignToRegWithShadow<[X21], [W21]>>>,
205 CCIfConsecutiveRegs<CCCustom<"CC_AArch64_Custom_Block">>,
207 // Handle i1, i8, i16, i32, i64, f32, f64 and v2f64 by passing in registers,
208 // up to eight each of GPR and FPR.
209 CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,
210 CCIfType<[i32], CCAssignToRegWithShadow<[W0, W1, W2, W3, W4, W5, W6, W7],
211 [X0, X1, X2, X3, X4, X5, X6, X7]>>,
212 // i128 is split to two i64s, we can't fit half to register X7.
214 CCIfSplit<CCAssignToRegWithShadow<[X0, X1, X2, X3, X4, X5, X6],
215 [W0, W1, W2, W3, W4, W5, W6]>>>,
216 // i128 is split to two i64s, and its stack alignment is 16 bytes.
217 CCIfType<[i64], CCIfSplit<CCAssignToStackWithShadow<8, 16, [X7]>>>,
219 CCIfType<[i64], CCAssignToRegWithShadow<[X0, X1, X2, X3, X4, X5, X6, X7],
220 [W0, W1, W2, W3, W4, W5, W6, W7]>>,
221 CCIfType<[f16], CCAssignToRegWithShadow<[H0, H1, H2, H3, H4, H5, H6, H7],
222 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
223 CCIfType<[bf16], CCAssignToRegWithShadow<[H0, H1, H2, H3, H4, H5, H6, H7],
224 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
225 CCIfType<[f32], CCAssignToRegWithShadow<[S0, S1, S2, S3, S4, S5, S6, S7],
226 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
227 CCIfType<[f64], CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
228 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
229 CCIfType<[v1i64, v2i32, v4i16, v8i8, v1f64, v2f32, v4f16, v4bf16],
230 CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
231 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
232 CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32, v2f64, v8f16, v8bf16],
233 CCAssignToReg<[Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
235 // If more than will fit in registers, pass them on the stack instead.
236 CCIf<"ValVT == MVT::i1 || ValVT == MVT::i8", CCAssignToStack<1, 1>>,
237 CCIf<"ValVT == MVT::i16 || ValVT == MVT::f16 || ValVT == MVT::bf16",
238 CCAssignToStack<2, 2>>,
239 CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
241 // Re-demote pointers to 32-bits so we don't end up storing 64-bit
242 // values and clobbering neighbouring stack locations. Not very pretty.
243 CCIfPtr<CCIfILP32<CCTruncToType<i32>>>,
244 CCIfPtr<CCIfILP32<CCAssignToStack<4, 4>>>,
246 CCIfType<[i64, f64, v1f64, v2f32, v1i64, v2i32, v4i16, v8i8, v4f16, v4bf16],
247 CCAssignToStack<8, 8>>,
248 CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32, v2f64, v8f16, v8bf16],
249 CCAssignToStack<16, 16>>
253 def CC_AArch64_DarwinPCS_VarArg : CallingConv<[
254 CCIfType<[iPTR], CCBitConvertToType<i64>>,
255 CCIfType<[v2f32], CCBitConvertToType<v2i32>>,
256 CCIfType<[v2f64, v4f32, f128], CCBitConvertToType<v2i64>>,
258 CCIfConsecutiveRegs<CCCustom<"CC_AArch64_Custom_Stack_Block">>,
260 // Handle all scalar types as either i64 or f64.
261 CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
262 CCIfType<[f16, bf16, f32], CCPromoteToType<f64>>,
264 // Everything is on the stack.
265 // i128 is split to two i64s, and its stack alignment is 16 bytes.
266 CCIfType<[i64], CCIfSplit<CCAssignToStack<8, 16>>>,
267 CCIfType<[i64, f64, v1i64, v2i32, v4i16, v8i8, v1f64, v2f32, v4f16, v4bf16],
268 CCAssignToStack<8, 8>>,
269 CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32, v2f64, v8f16, v8bf16],
270 CCAssignToStack<16, 16>>
273 // In the ILP32 world, the minimum stack slot size is 4 bytes. Otherwise the
274 // same as the normal Darwin VarArgs handling.
276 def CC_AArch64_DarwinPCS_ILP32_VarArg : CallingConv<[
277 CCIfType<[v2f32], CCBitConvertToType<v2i32>>,
278 CCIfType<[v2f64, v4f32, f128], CCBitConvertToType<v2i64>>,
280 // Handle all scalar types as either i32 or f32.
281 CCIfType<[i8, i16], CCPromoteToType<i32>>,
282 CCIfType<[f16, bf16], CCPromoteToType<f32>>,
284 // Everything is on the stack.
285 // i128 is split to two i64s, and its stack alignment is 16 bytes.
286 CCIfPtr<CCIfILP32<CCTruncToType<i32>>>,
287 CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
288 CCIfType<[i64], CCIfSplit<CCAssignToStack<8, 16>>>,
289 CCIfType<[i64, f64, v1i64, v2i32, v4i16, v8i8, v1f64, v2f32, v4f16, v4bf16],
290 CCAssignToStack<8, 8>>,
291 CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32, v2f64, v8f16, v8bf16],
292 CCAssignToStack<16, 16>>
296 // The WebKit_JS calling convention only passes the first argument (the callee)
297 // in register and the remaining arguments on stack. We allow 32bit stack slots,
298 // so that WebKit can write partial values in the stack and define the other
299 // 32bit quantity as undef.
301 def CC_AArch64_WebKit_JS : CallingConv<[
302 // Handle i1, i8, i16, i32, and i64 passing in register X0 (W0).
303 CCIfType<[i1, i8, i16], CCPromoteToType<i32>>,
304 CCIfType<[i32], CCAssignToRegWithShadow<[W0], [X0]>>,
305 CCIfType<[i64], CCAssignToRegWithShadow<[X0], [W0]>>,
307 // Pass the remaining arguments on the stack instead.
308 CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
309 CCIfType<[i64, f64], CCAssignToStack<8, 8>>
313 def RetCC_AArch64_WebKit_JS : CallingConv<[
314 CCIfType<[i32], CCAssignToRegWithShadow<[W0, W1, W2, W3, W4, W5, W6, W7],
315 [X0, X1, X2, X3, X4, X5, X6, X7]>>,
316 CCIfType<[i64], CCAssignToRegWithShadow<[X0, X1, X2, X3, X4, X5, X6, X7],
317 [W0, W1, W2, W3, W4, W5, W6, W7]>>,
318 CCIfType<[f32], CCAssignToRegWithShadow<[S0, S1, S2, S3, S4, S5, S6, S7],
319 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>,
320 CCIfType<[f64], CCAssignToRegWithShadow<[D0, D1, D2, D3, D4, D5, D6, D7],
321 [Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7]>>
324 //===----------------------------------------------------------------------===//
325 // ARM64 Calling Convention for GHC
326 //===----------------------------------------------------------------------===//
328 // This calling convention is specific to the Glasgow Haskell Compiler.
329 // The only documentation is the GHC source code, specifically the C header
332 // https://github.com/ghc/ghc/blob/master/includes/stg/MachRegs.h
334 // which defines the registers for the Spineless Tagless G-Machine (STG) that
335 // GHC uses to implement lazy evaluation. The generic STG machine has a set of
336 // registers which are mapped to appropriate set of architecture specific
337 // registers for each CPU architecture.
339 // The STG Machine is documented here:
341 // https://ghc.haskell.org/trac/ghc/wiki/Commentary/Compiler/GeneratedCode
343 // The AArch64 register mapping is under the heading "The ARMv8/AArch64 ABI
344 // register mapping".
347 def CC_AArch64_GHC : CallingConv<[
348 CCIfType<[iPTR], CCBitConvertToType<i64>>,
350 // Handle all vector types as either f64 or v2f64.
351 CCIfType<[v1i64, v2i32, v4i16, v8i8, v2f32], CCBitConvertToType<f64>>,
352 CCIfType<[v2i64, v4i32, v8i16, v16i8, v4f32, f128], CCBitConvertToType<v2f64>>,
354 CCIfType<[v2f64], CCAssignToReg<[Q4, Q5]>>,
355 CCIfType<[f32], CCAssignToReg<[S8, S9, S10, S11]>>,
356 CCIfType<[f64], CCAssignToReg<[D12, D13, D14, D15]>>,
358 // Promote i8/i16/i32 arguments to i64.
359 CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
361 // Pass in STG registers: Base, Sp, Hp, R1, R2, R3, R4, R5, R6, SpLim
362 CCIfType<[i64], CCAssignToReg<[X19, X20, X21, X22, X23, X24, X25, X26, X27, X28]>>
365 // The order of the callee-saves in this file is important, because the
366 // FrameLowering code will use this order to determine the layout the
367 // callee-save area in the stack frame. As can be observed below, Darwin
368 // requires the frame-record (LR, FP) to be at the top the callee-save area,
369 // whereas for other platforms they are at the bottom.
371 // FIXME: LR is only callee-saved in the sense that *we* preserve it and are
372 // presumably a callee to someone. External functions may not do so, but this
373 // is currently safe since BL has LR as an implicit-def and what happens after a
374 // tail call doesn't matter.
376 // It would be better to model its preservation semantics properly (create a
377 // vreg on entry, use it in RET & tail call generation; make that vreg def if we
378 // end up saving LR as part of a call frame). Watch this space...
379 def CSR_AArch64_AAPCS : CalleeSavedRegs<(add X19, X20, X21, X22, X23, X24,
380 X25, X26, X27, X28, LR, FP,
382 D12, D13, D14, D15)>;
384 // A variant for treating X18 as callee saved, when interfacing with
385 // code that needs X18 to be preserved.
386 def CSR_AArch64_AAPCS_X18 : CalleeSavedRegs<(add X18, CSR_AArch64_AAPCS)>;
388 // Win64 has unwinding codes for an (FP,LR) pair, save_fplr and save_fplr_x.
389 // We put FP before LR, so that frame lowering logic generates (FP,LR) pairs,
390 // and not (LR,FP) pairs.
391 def CSR_Win_AArch64_AAPCS : CalleeSavedRegs<(add X19, X20, X21, X22, X23, X24,
392 X25, X26, X27, X28, FP, LR,
394 D12, D13, D14, D15)>;
396 // The Control Flow Guard check call uses a custom calling convention that also
397 // preserves X0-X8 and Q0-Q7.
398 def CSR_Win_AArch64_CFGuard_Check : CalleeSavedRegs<(add CSR_Win_AArch64_AAPCS,
399 (sequence "X%u", 0, 8),
400 (sequence "Q%u", 0, 7))>;
402 // AArch64 PCS for vector functions (VPCS)
403 // must (additionally) preserve full Q8-Q23 registers
404 def CSR_AArch64_AAVPCS : CalleeSavedRegs<(add X19, X20, X21, X22, X23, X24,
405 X25, X26, X27, X28, LR, FP,
406 (sequence "Q%u", 8, 23))>;
408 // Functions taking SVE arguments or returning an SVE type
409 // must (additionally) preserve full Z8-Z23 and predicate registers P4-P15
410 def CSR_AArch64_SVE_AAPCS : CalleeSavedRegs<(add (sequence "Z%u", 8, 23),
411 (sequence "P%u", 4, 15),
412 X19, X20, X21, X22, X23, X24,
413 X25, X26, X27, X28, LR, FP)>;
415 // Constructors and destructors return 'this' in the iOS 64-bit C++ ABI; since
416 // 'this' and the pointer return value are both passed in X0 in these cases,
417 // this can be partially modelled by treating X0 as a callee-saved register;
418 // only the resulting RegMask is used; the SaveList is ignored
420 // (For generic ARM 64-bit ABI code, clang will not generate constructors or
421 // destructors with 'this' returns, so this RegMask will not be used in that
423 def CSR_AArch64_AAPCS_ThisReturn : CalleeSavedRegs<(add CSR_AArch64_AAPCS, X0)>;
425 def CSR_AArch64_AAPCS_SwiftError
426 : CalleeSavedRegs<(sub CSR_AArch64_AAPCS, X21)>;
428 // The ELF stub used for TLS-descriptor access saves every feasible
429 // register. Only X0 and LR are clobbered.
430 def CSR_AArch64_TLS_ELF
431 : CalleeSavedRegs<(add (sequence "X%u", 1, 28), FP,
432 (sequence "Q%u", 0, 31))>;
434 def CSR_AArch64_AllRegs
435 : CalleeSavedRegs<(add (sequence "W%u", 0, 30), WSP,
436 (sequence "X%u", 0, 28), FP, LR, SP,
437 (sequence "B%u", 0, 31), (sequence "H%u", 0, 31),
438 (sequence "S%u", 0, 31), (sequence "D%u", 0, 31),
439 (sequence "Q%u", 0, 31))>;
441 def CSR_AArch64_NoRegs : CalleeSavedRegs<(add)>;
443 def CSR_AArch64_RT_MostRegs : CalleeSavedRegs<(add CSR_AArch64_AAPCS,
444 (sequence "X%u", 9, 15))>;
446 def CSR_AArch64_StackProbe_Windows
447 : CalleeSavedRegs<(add (sequence "X%u", 0, 15),
448 (sequence "X%u", 18, 28), FP, SP,
449 (sequence "Q%u", 0, 31))>;
451 // Darwin variants of AAPCS.
452 // Darwin puts the frame-record at the top of the callee-save area.
453 def CSR_Darwin_AArch64_AAPCS : CalleeSavedRegs<(add LR, FP, X19, X20, X21, X22,
454 X23, X24, X25, X26, X27, X28,
456 D12, D13, D14, D15)>;
458 def CSR_Darwin_AArch64_AAVPCS : CalleeSavedRegs<(add LR, FP, X19, X20, X21,
459 X22, X23, X24, X25, X26, X27,
460 X28, (sequence "Q%u", 8, 23))>;
461 def CSR_Darwin_AArch64_AAPCS_ThisReturn
462 : CalleeSavedRegs<(add CSR_Darwin_AArch64_AAPCS, X0)>;
464 def CSR_Darwin_AArch64_AAPCS_SwiftError
465 : CalleeSavedRegs<(sub CSR_Darwin_AArch64_AAPCS, X21)>;
467 // The function used by Darwin to obtain the address of a thread-local variable
468 // guarantees more than a normal AAPCS function. x16 and x17 are used on the
469 // fast path for calculation, but other registers except X0 (argument/return)
470 // and LR (it is a call, after all) are preserved.
471 def CSR_Darwin_AArch64_TLS
472 : CalleeSavedRegs<(add (sub (sequence "X%u", 1, 28), X16, X17),
474 (sequence "Q%u", 0, 31))>;
476 // We can only handle a register pair with adjacent registers, the register pair
477 // should belong to the same class as well. Since the access function on the
478 // fast path calls a function that follows CSR_Darwin_AArch64_TLS,
479 // CSR_Darwin_AArch64_CXX_TLS should be a subset of CSR_Darwin_AArch64_TLS.
480 def CSR_Darwin_AArch64_CXX_TLS
481 : CalleeSavedRegs<(add CSR_Darwin_AArch64_AAPCS,
482 (sub (sequence "X%u", 1, 28), X15, X16, X17, X18),
483 (sequence "D%u", 0, 31))>;
485 // CSRs that are handled by prologue, epilogue.
486 def CSR_Darwin_AArch64_CXX_TLS_PE
487 : CalleeSavedRegs<(add LR, FP)>;
489 // CSRs that are handled explicitly via copies.
490 def CSR_Darwin_AArch64_CXX_TLS_ViaCopy
491 : CalleeSavedRegs<(sub CSR_Darwin_AArch64_CXX_TLS, LR, FP)>;
493 def CSR_Darwin_AArch64_RT_MostRegs
494 : CalleeSavedRegs<(add CSR_Darwin_AArch64_AAPCS, (sequence "X%u", 9, 15))>;
496 // Variants of the standard calling conventions for shadow call stack.
497 // These all preserve x18 in addition to any other registers.
498 def CSR_AArch64_NoRegs_SCS
499 : CalleeSavedRegs<(add CSR_AArch64_NoRegs, X18)>;
500 def CSR_AArch64_AllRegs_SCS
501 : CalleeSavedRegs<(add CSR_AArch64_AllRegs, X18)>;
502 def CSR_AArch64_AAPCS_SwiftError_SCS
503 : CalleeSavedRegs<(add CSR_AArch64_AAPCS_SwiftError, X18)>;
504 def CSR_AArch64_RT_MostRegs_SCS
505 : CalleeSavedRegs<(add CSR_AArch64_RT_MostRegs, X18)>;
506 def CSR_AArch64_AAVPCS_SCS
507 : CalleeSavedRegs<(add CSR_AArch64_AAVPCS, X18)>;
508 def CSR_AArch64_SVE_AAPCS_SCS
509 : CalleeSavedRegs<(add CSR_AArch64_SVE_AAPCS, X18)>;
510 def CSR_AArch64_AAPCS_SCS
511 : CalleeSavedRegs<(add CSR_AArch64_AAPCS, X18)>;