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//===- LanaiCallingConv.td - Calling Conventions Lanai -------*- tablegen -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This describes the calling conventions for the Lanai architectures.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Return Value Calling Conventions
//===----------------------------------------------------------------------===//
// Lanai 32-bit C Calling convention.
def CC_Lanai32 : CallingConv<[
// Promote i8/i16 args to i32
CCIfType<[i8, i16], CCPromoteToType<i32>>,
// Put argument in registers if marked 'inreg' and not a vararg call.
CCIfNotVarArg<CCIfInReg<CCIfType<[i32],
CCAssignToReg<[R6, R7, R18, R19]>>>>,
// Otherwise they are assigned to the stack in 4-byte aligned units.
CCAssignToStack<4, 4>
]>;
// Lanai 32-bit Fast Calling convention.
def CC_Lanai32_Fast : CallingConv<[
// Promote i8/i16 args to i32
CCIfType<[ i8, i16 ], CCPromoteToType<i32>>,
// Put arguments in registers.
CCIfNotVarArg<CCIfType<[i32], CCAssignToReg<[ R6, R7, R18, R19 ]>>>,
// Otherwise they are assigned to the stack in 4-byte aligned units.
CCAssignToStack<4, 4>
]>;
// Lanai 32-bit C return-value convention.
def RetCC_Lanai32 : CallingConv<[
// Specify two registers to allow returning 64-bit results that have already
// been lowered to 2 32-bit values.
CCIfType<[i32], CCAssignToReg<[RV, R9]>>
]>;
def CSR: CalleeSavedRegs<(add)>;
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