MSP430CallingConv.td revision cf9adf2cbb8298e83b53d7bee2ddab4c875cb3c5 
1//==- MSP430CallingConv.td - Calling Conventions for MSP430 -*- tablegen -*-==//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9// This describes the calling conventions for MSP430 architecture.
10//===----------------------------------------------------------------------===//
11
12//===----------------------------------------------------------------------===//
13// MSP430 Return Value Calling Convention
14//===----------------------------------------------------------------------===//
15def RetCC_MSP430 : CallingConv<[
16  // i16 are returned in registers R15, R14, R13, R12
17  CCIfType<[i16], CCAssignToReg<[R15W, R14W, R13W, R12W]>>
18]>;
19
20//===----------------------------------------------------------------------===//
21// MSP430 Argument Calling Conventions
22//===----------------------------------------------------------------------===//
23def CC_MSP430 : CallingConv<[
24  // Promote i8 arguments to i16.
25  CCIfType<[i8], CCPromoteToType<i16>>,
26
27  // The first 4 integer arguments of non-varargs functions are passed in
28  // integer registers.
29  CCIfNotVarArg<CCIfType<[i16], CCAssignToReg<[R15W, R14W, R13W, R12W]>>>,
30
31  // Integer values get stored in stack slots that are 2 bytes in
32  // size and 2-byte aligned.
33  CCIfType<[i16], CCAssignToStack<2, 2>>
34]>;
35