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