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llvm-mirror/lib/Target/AVR/AVRCallingConv.td
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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2.1 KiB
TableGen

//===-- AVRCallingConv.td - Calling Conventions for AVR ----*- tablegen -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// This describes the calling conventions for AVR architecture.
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// AVR Return Value Calling Convention
//===----------------------------------------------------------------------===//
def RetCC_AVR : CallingConv
<[
// i8 is returned in R24.
CCIfType<[i8], CCAssignToReg<[R24]>>,
// i16 are returned in R25:R24, R23:R22, R21:R20 and R19:R18.
CCIfType<[i16], CCAssignToReg<[R25R24, R23R22, R21R20, R19R18]>>
]>;
// Special return value calling convention for runtime functions.
def RetCC_AVR_BUILTIN : CallingConv
<[
CCIfType<[i8], CCAssignToReg<[R24,R25]>>,
CCIfType<[i16], CCAssignToReg<[R23R22, R25R24]>>
]>;
//===----------------------------------------------------------------------===//
// AVR Argument Calling Conventions
//===----------------------------------------------------------------------===//
// The calling conventions are implemented in custom C++ code
// Calling convention for variadic functions.
def ArgCC_AVR_Vararg : CallingConv
<[
// i16 are always passed through the stack with an alignment of 1.
CCAssignToStack<2, 1>
]>;
// Special argument calling convention for
// division runtime functions.
def ArgCC_AVR_BUILTIN_DIV : CallingConv
<[
CCIfType<[i8], CCAssignToReg<[R24,R22]>>,
CCIfType<[i16], CCAssignToReg<[R25R24, R23R22]>>
]>;
//===----------------------------------------------------------------------===//
// Callee-saved register lists.
//===----------------------------------------------------------------------===//
def CSR_Normal : CalleeSavedRegs<(add R29, R28, (sequence "R%u", 17, 2))>;
def CSR_Interrupts : CalleeSavedRegs<(add (sequence "R%u", 31, 0))>;