llvm-6502/lib/Target/Mips/MipsCallingConv.td
2010-08-17 16:20:04 +00:00

87 lines
3.2 KiB
TableGen

//===- 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
CCIfType<[i32], CCAssignToReg<[V0, V1]>>,
// f32 are returned in registers F0, F2
CCIfType<[f32], CCAssignToReg<[F0, F2]>>,
// f64 are returned in register D0, D1
CCIfType<[f64], CCIfSubtarget<"isNotSingleFloat()", CCAssignToReg<[D0, D1]>>>
]>;
//===----------------------------------------------------------------------===//
// 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 doubl 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 Calling Convention Dispatch
//===----------------------------------------------------------------------===//
def CC_Mips : CallingConv<[
CCIfSubtarget<"isABI_EABI()", CCDelegateTo<CC_MipsEABI>>
]>;
def RetCC_Mips : CallingConv<[
CCIfSubtarget<"isABI_EABI()", CCDelegateTo<RetCC_MipsEABI>>,
CCDelegateTo<RetCC_MipsO32>
]>;