SystemZCallingConv.td revision e0167c1d5a5418dbcd61716164688bdd21a716ac 
1//=- SystemZCallingConv.td - Calling Conventions for SystemZ -*- 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 SystemZ architecture.
10//===----------------------------------------------------------------------===//
11
12//===----------------------------------------------------------------------===//
13// SystemZ Return Value Calling Convention
14//===----------------------------------------------------------------------===//
15def RetCC_SystemZ : CallingConv<[
16  // i64 is returned in register R2
17  CCIfType<[i64], CCAssignToReg<[R2D]>>
18]>;
19
20//===----------------------------------------------------------------------===//
21// SystemZ Argument Calling Conventions
22//===----------------------------------------------------------------------===//
23def CC_SystemZ : CallingConv<[
24  // Promote i8/i16/i32 arguments to i64.
25  CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
26
27  // The first 5 integer arguments of non-varargs functions are passed in
28  // integer registers.
29  // FIXME: Check stuff for varagrs
30  CCIfNotVarArg<CCIfType<[i64],
31                CCAssignToReg<[R2D, R3D, R4D, R5D, R6D]>>>,
32
33  // Integer values get stored in stack slots that are 8 bytes in
34  // size and 8-byte aligned.
35  CCIfType<[i64], CCAssignToStack<8, 8>>
36]>;
37