1//==- MSP430CallingConv.td - Calling Conventions for MSP430 -*- tablegen -*-==//
2//
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
6//
7//===----------------------------------------------------------------------===//
8// This describes the calling conventions for MSP430 architecture.
9//===----------------------------------------------------------------------===//
10
11//===----------------------------------------------------------------------===//
12// MSP430 Return Value Calling Convention
13//===----------------------------------------------------------------------===//
14def RetCC_MSP430 : CallingConv<[
15  // i8 are returned in registers R12B, R13B, R14B, R15B
16  CCIfType<[i8], CCAssignToReg<[R12B, R13B, R14B, R15B]>>,
17
18  // i16 are returned in registers R12, R13, R14, R15
19  CCIfType<[i16], CCAssignToReg<[R12, R13, R14, R15]>>
20]>;
21
22//===----------------------------------------------------------------------===//
23// MSP430 Argument Calling Conventions
24//===----------------------------------------------------------------------===//
25def CC_MSP430_AssignStack : CallingConv<[
26  // Pass by value if the byval attribute is given
27  CCIfByVal<CCPassByVal<2, 2>>,
28
29  // Promote i8 arguments to i16.
30  CCIfType<[i8], CCPromoteToType<i16>>,
31
32  // Integer values get stored in stack slots that are 2 bytes in
33  // size and 2-byte aligned.
34  CCIfType<[i16], CCAssignToStack<2, 2>>
35]>;
36
37