MSP430CallingConv.td revision 3edacfa97001b1eda9126bcabd68b15c7d8065f2 
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  // i8 are returned in registers R15B, R14B, R13B, R12B
17  CCIfType<[i8], CCAssignToReg<[R15B, R14B, R13B, R12B]>>,
18
19  // i16 are returned in registers R15, R14, R13, R12
20  CCIfType<[i16], CCAssignToReg<[R15W, R14W, R13W, R12W]>>
21]>;
22
23//===----------------------------------------------------------------------===//
24// MSP430 Argument Calling Conventions
25//===----------------------------------------------------------------------===//
26def CC_MSP430_AssignStack : CallingConv<[
27  // Pass by value if the byval attribute is given
28  CCIfByVal<CCPassByVal<2, 2>>,
29
30  // Promote i8 arguments to i16.
31  CCIfType<[i8], CCPromoteToType<i16>>,
32
33  // Integer values get stored in stack slots that are 2 bytes in
34  // size and 2-byte aligned.
35  CCIfType<[i16], CCAssignToStack<2, 2>>
36]>;
37
38