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//=- SystemZCallingConv.td - Calling Conventions for SystemZ -*- tablegen -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// This describes the calling conventions for SystemZ architecture.
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// SystemZ Return Value Calling Convention
//===----------------------------------------------------------------------===//
def RetCC_SystemZ : CallingConv<[
// Promote i8/i16/i32 arguments to i64.
CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
// i64 is returned in register R2
CCIfType<[i64], CCAssignToReg<[R2D, R3D, R4D, R5D]>>,
// f32 / f64 are returned in F0
CCIfType<[f32], CCAssignToReg<[F0S, F2S, F4S, F6S]>>,
CCIfType<[f64], CCAssignToReg<[F0L, F2L, F4L, F6L]>>
]>;
//===----------------------------------------------------------------------===//
// SystemZ Argument Calling Conventions
//===----------------------------------------------------------------------===//
def CC_SystemZ : CallingConv<[
// Promote i8/i16/i32 arguments to i64.
CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
// The first 5 integer arguments of non-varargs functions are passed in
// integer registers.
CCIfType<[i64], CCAssignToReg<[R2D, R3D, R4D, R5D, R6D]>>,
// The first 4 floating point arguments of non-varargs functions are passed
// in FP registers.
CCIfType<[f32], CCAssignToReg<[F0S, F2S, F4S, F6S]>>,
CCIfType<[f64], CCAssignToReg<[F0L, F2L, F4L, F6L]>>,
// Integer values get stored in stack slots that are 8 bytes in
// size and 8-byte aligned.
CCIfType<[i64, f32, f64], CCAssignToStack<8, 8>>
]>;
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