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, R3D, R4D, R5D]>>,
22 // f32 / f64 are returned in F0
23 CCIfType<[f32], CCAssignToReg<[F0S, F2S, F4S, F6S]>>,
24 CCIfType<[f64], CCAssignToReg<[F0L, F2L, F4L, F6L]>>
27 //===----------------------------------------------------------------------===//
28 // SystemZ Argument Calling Conventions
29 //===----------------------------------------------------------------------===//
30 def CC_SystemZ : CallingConv<[
31 // Promote i8/i16/i32 arguments to i64.
32 CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
34 // The first 5 integer arguments of non-varargs functions are passed in
36 CCIfType<[i64], CCAssignToReg<[R2D, R3D, R4D, R5D, R6D]>>,
38 // The first 4 floating point arguments of non-varargs functions are passed
40 CCIfType<[f32], CCAssignToReg<[F0S, F2S, F4S, F6S]>>,
41 CCIfType<[f64], CCAssignToReg<[F0L, F2L, F4L, F6L]>>,
43 // Integer values get stored in stack slots that are 8 bytes in
44 // size and 8-byte aligned.
45 CCIfType<[i64, f32, f64], CCAssignToStack<8, 8>>