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//===-- MipsCallingConv.td - Calling Conventions for Mips --*- tablegen -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// This describes the calling conventions for Mips architecture.
//===----------------------------------------------------------------------===//
/// CCIfSubtarget - Match if the current subtarget has a feature F.
class CCIfSubtarget<string F, CCAction A>:
CCIf<!strconcat("State.getTarget().getSubtarget<MipsSubtarget>().", F), A>;
//===----------------------------------------------------------------------===//
// Mips O32 Calling Convention
//===----------------------------------------------------------------------===//
// Only the return rules are defined here for O32. The rules for argument
// passing are defined in MipsISelLowering.cpp.
def RetCC_MipsO32 : CallingConv<[
// i32 are returned in registers V0, V1, A0, A1
CCIfType<[i32], CCAssignToReg<[V0, V1, A0, A1]>>,
// f32 are returned in registers F0, F2
CCIfType<[f32], CCAssignToReg<[F0, F2]>>,
// f64 arguments are returned in D0_64 and D1_64 in FP64bit mode or
// in D0 and D1 in FP32bit mode.
CCIfType<[f64], CCIfSubtarget<"isFP64bit()", CCAssignToReg<[D0_64, D1_64]>>>,
CCIfType<[f64], CCIfSubtarget<"isNotFP64bit()", CCAssignToReg<[D0, D1]>>>
]>;
//===----------------------------------------------------------------------===//
// Mips N32/64 Calling Convention
//===----------------------------------------------------------------------===//
def CC_MipsN : CallingConv<[
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
// Integer arguments are passed in integer registers.
CCIfType<[i32], CCAssignToRegWithShadow<[A0, A1, A2, A3,
T0, T1, T2, T3],
[F12, F13, F14, F15,
F16, F17, F18, F19]>>,
CCIfType<[i64], CCAssignToRegWithShadow<[A0_64, A1_64, A2_64, A3_64,
T0_64, T1_64, T2_64, T3_64],
[D12_64, D13_64, D14_64, D15_64,
D16_64, D17_64, D18_64, D19_64]>>,
// f32 arguments are passed in single precision FP registers.
CCIfType<[f32], CCAssignToRegWithShadow<[F12, F13, F14, F15,
F16, F17, F18, F19],
[A0_64, A1_64, A2_64, A3_64,
T0_64, T1_64, T2_64, T3_64]>>,
// f64 arguments are passed in double precision FP registers.
CCIfType<[f64], CCAssignToRegWithShadow<[D12_64, D13_64, D14_64, D15_64,
D16_64, D17_64, D18_64, D19_64],
[A0_64, A1_64, A2_64, A3_64,
T0_64, T1_64, T2_64, T3_64]>>,
// All stack parameter slots become 64-bit doublewords and are 8-byte aligned.
CCIfType<[i32, f32], CCAssignToStack<4, 8>>,
CCIfType<[i64, f64], CCAssignToStack<8, 8>>
]>;
// N32/64 variable arguments.
// All arguments are passed in integer registers.
def CC_MipsN_VarArg : CallingConv<[
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
CCIfType<[i32, f32], CCAssignToReg<[A0, A1, A2, A3, T0, T1, T2, T3]>>,
CCIfType<[i64, f64], CCAssignToReg<[A0_64, A1_64, A2_64, A3_64,
T0_64, T1_64, T2_64, T3_64]>>,
// All stack parameter slots become 64-bit doublewords and are 8-byte aligned.
CCIfType<[i32, f32], CCAssignToStack<4, 8>>,
CCIfType<[i64, f64], CCAssignToStack<8, 8>>
]>;
def RetCC_MipsN : CallingConv<[
// i32 are returned in registers V0, V1
CCIfType<[i32], CCAssignToReg<[V0, V1]>>,
// i64 are returned in registers V0_64, V1_64
CCIfType<[i64], CCAssignToReg<[V0_64, V1_64]>>,
// f32 are returned in registers F0, F2
CCIfType<[f32], CCAssignToReg<[F0, F2]>>,
// f64 are returned in registers D0, D2
CCIfType<[f64], CCAssignToReg<[D0_64, D2_64]>>
]>;
// In soft-mode, register A0_64, instead of V1_64, is used to return a long
// double value.
def RetCC_F128Soft : CallingConv<[
CCIfType<[i64], CCAssignToReg<[V0_64, A0_64]>>
]>;
//===----------------------------------------------------------------------===//
// Mips EABI Calling Convention
//===----------------------------------------------------------------------===//
def CC_MipsEABI : CallingConv<[
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
// Integer arguments are passed in integer registers.
CCIfType<[i32], CCAssignToReg<[A0, A1, A2, A3, T0, T1, T2, T3]>>,
// Single fp arguments are passed in pairs within 32-bit mode
CCIfType<[f32], CCIfSubtarget<"isSingleFloat()",
CCAssignToReg<[F12, F13, F14, F15, F16, F17, F18, F19]>>>,
CCIfType<[f32], CCIfSubtarget<"isNotSingleFloat()",
CCAssignToReg<[F12, F14, F16, F18]>>>,
// The first 4 double fp arguments are passed in single fp registers.
CCIfType<[f64], CCIfSubtarget<"isNotSingleFloat()",
CCAssignToReg<[D6, D7, D8, D9]>>>,
// Integer values get stored in stack slots that are 4 bytes in
// size and 4-byte aligned.
CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
// Integer values get stored in stack slots that are 8 bytes in
// size and 8-byte aligned.
CCIfType<[f64], CCIfSubtarget<"isNotSingleFloat()", CCAssignToStack<8, 8>>>
]>;
def RetCC_MipsEABI : CallingConv<[
// i32 are returned in registers V0, V1
CCIfType<[i32], CCAssignToReg<[V0, V1]>>,
// f32 are returned in registers F0, F1
CCIfType<[f32], CCAssignToReg<[F0, F1]>>,
// f64 are returned in register D0
CCIfType<[f64], CCIfSubtarget<"isNotSingleFloat()", CCAssignToReg<[D0]>>>
]>;
//===----------------------------------------------------------------------===//
// Mips FastCC Calling Convention
//===----------------------------------------------------------------------===//
def CC_MipsO32_FastCC : CallingConv<[
// f64 arguments are passed in double-precision floating pointer registers.
CCIfType<[f64], CCIfSubtarget<"isNotFP64bit()",
CCAssignToReg<[D0, D1, D2, D3, D4, D5, D6, D7,
D8, D9]>>>,
CCIfType<[f64], CCIfSubtarget<"isFP64bit()",
CCAssignToReg<[D0_64, D1_64, D2_64, D3_64,
D4_64, D5_64, D6_64, D7_64,
D8_64, D9_64, D10_64, D11_64,
D12_64, D13_64, D14_64, D15_64,
D16_64, D17_64, D18_64,
D19_64]>>>,
// Stack parameter slots for f64 are 64-bit doublewords and 8-byte aligned.
CCIfType<[f64], CCAssignToStack<8, 8>>
]>;
def CC_MipsN_FastCC : CallingConv<[
// Integer arguments are passed in integer registers.
CCIfType<[i64], CCAssignToReg<[A0_64, A1_64, A2_64, A3_64, T0_64, T1_64,
T2_64, T3_64, T4_64, T5_64, T6_64, T7_64,
T8_64, V1_64]>>,
// f64 arguments are passed in double-precision floating pointer registers.
CCIfType<[f64], CCAssignToReg<[D0_64, D1_64, D2_64, D3_64, D4_64, D5_64,
D6_64, D7_64, D8_64, D9_64, D10_64, D11_64,
D12_64, D13_64, D14_64, D15_64, D16_64, D17_64,
D18_64, D19_64]>>,
// Stack parameter slots for i64 and f64 are 64-bit doublewords and
// 8-byte aligned.
CCIfType<[i64, f64], CCAssignToStack<8, 8>>
]>;
def CC_Mips_FastCC : CallingConv<[
// Handles byval parameters.
CCIfByVal<CCPassByVal<4, 4>>,
// Promote i8/i16 arguments to i32.
CCIfType<[i8, i16], CCPromoteToType<i32>>,
// Integer arguments are passed in integer registers. All scratch registers,
// except for AT, V0 and T9, are available to be used as argument registers.
CCIfType<[i32], CCAssignToReg<[A0, A1, A2, A3, T0, T1, T2, T3, T4, T5, T6,
T7, T8, V1]>>,
// f32 arguments are passed in single-precision floating pointer registers.
CCIfType<[f32], CCAssignToReg<[F0, F1, F2, F3, F4, F5, F6, F7, F8, F9, F10,
F11, F12, F13, F14, F15, F16, F17, F18, F19]>>,
// Stack parameter slots for i32 and f32 are 32-bit words and 4-byte aligned.
CCIfType<[i32, f32], CCAssignToStack<4, 4>>,
CCIfSubtarget<"isABI_EABI()", CCDelegateTo<CC_MipsEABI>>,
CCIfSubtarget<"isABI_O32()", CCDelegateTo<CC_MipsO32_FastCC>>,
CCDelegateTo<CC_MipsN_FastCC>
]>;
//==
def CC_Mips16RetHelper : CallingConv<[
// Integer arguments are passed in integer registers.
CCIfType<[i32], CCAssignToReg<[V0, V1, A0, A1]>>
]>;
//===----------------------------------------------------------------------===//
// Mips Calling Convention Dispatch
//===----------------------------------------------------------------------===//
def RetCC_Mips : CallingConv<[
CCIfSubtarget<"isABI_EABI()", CCDelegateTo<RetCC_MipsEABI>>,
CCIfSubtarget<"isABI_N32()", CCDelegateTo<RetCC_MipsN>>,
CCIfSubtarget<"isABI_N64()", CCDelegateTo<RetCC_MipsN>>,
CCDelegateTo<RetCC_MipsO32>
]>;
//===----------------------------------------------------------------------===//
// Callee-saved register lists.
//===----------------------------------------------------------------------===//
def CSR_SingleFloatOnly : CalleeSavedRegs<(add (sequence "F%u", 31, 20), RA, FP,
(sequence "S%u", 7, 0))>;
def CSR_O32 : CalleeSavedRegs<(add (sequence "D%u", 15, 10), RA, FP,
(sequence "S%u", 7, 0))>;
def CSR_O32_FP64 : CalleeSavedRegs<(add (sequence "D%u_64", 31, 20), RA, FP,
(sequence "S%u", 7, 0))>;
def CSR_N32 : CalleeSavedRegs<(add D31_64, D29_64, D27_64, D25_64, D24_64,
D23_64, D22_64, D21_64, RA_64, FP_64, GP_64,
(sequence "S%u_64", 7, 0))>;
def CSR_N64 : CalleeSavedRegs<(add (sequence "D%u_64", 31, 24), RA_64, FP_64,
GP_64, (sequence "S%u_64", 7, 0))>;
def CSR_Mips16RetHelper :
CalleeSavedRegs<(add V0, V1, (sequence "A%u", 3, 0), S0, S1)>;
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