1 //=- SystemZCallingConv.td - Calling Conventions for SystemZ -*- tablegen -*-=//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
9 // This describes the calling conventions for SystemZ architecture.
10 //===----------------------------------------------------------------------===//
12 //===----------------------------------------------------------------------===//
13 // SystemZ Return Value Calling Convention
14 //===----------------------------------------------------------------------===//
15 def RetCC_SystemZ : CallingConv<[
16 // Promote i8/i16/i32 arguments to i64.
17 CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
19 // i64 is returned in register R2
20 CCIfType<[i64], CCAssignToReg<[R2D]>>
23 //===----------------------------------------------------------------------===//
24 // SystemZ Argument Calling Conventions
25 //===----------------------------------------------------------------------===//
26 def CC_SystemZ : CallingConv<[
27 // Promote i8/i16/i32 arguments to i64.
28 CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
30 // The first 5 integer arguments of non-varargs functions are passed in
32 // FIXME: Check stuff for varagrs
33 CCIfNotVarArg<CCIfType<[i64],
34 CCAssignToReg<[R2D, R3D, R4D, R5D, R6D]>>>,
36 // Integer values get stored in stack slots that are 8 bytes in
37 // size and 8-byte aligned.
38 CCIfType<[i64], CCAssignToStack<8, 8>>