1 //===-- RISCVCallingConv.td - Calling Conventions RISC-V ---*- tablegen -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This describes the calling conventions for the RISC-V architecture.
11 //===----------------------------------------------------------------------===//
13 // The RISC-V calling convention is handled with custom code in
14 // RISCVISelLowering.cpp (CC_RISCV).
16 def CSR_ILP32E_LP64E : CalleeSavedRegs<(add X1, X8, X9)>;
19 : CalleeSavedRegs<(add CSR_ILP32E_LP64E, (sequence "X%u", 18, 27))>;
22 : CalleeSavedRegs<(add CSR_ILP32_LP64,
23 F8_F, F9_F, (sequence "F%u_F", 18, 27))>;
26 : CalleeSavedRegs<(add CSR_ILP32_LP64,
27 F8_D, F9_D, (sequence "F%u_D", 18, 27))>;
29 // Needed for implementation of RISCVRegisterInfo::getNoPreservedMask()
30 def CSR_NoRegs : CalleeSavedRegs<(add)>;
32 // Interrupt handler needs to save/restore all registers that are used,
33 // both Caller and Callee saved registers.
34 def CSR_Interrupt : CalleeSavedRegs<(add X1, (sequence "X%u", 5, 31))>;
36 // Same as CSR_Interrupt, but including all 32-bit FP registers.
37 def CSR_XLEN_F32_Interrupt: CalleeSavedRegs<(add CSR_Interrupt,
38 (sequence "F%u_F", 0, 31))>;
40 // Same as CSR_Interrupt, but including all 64-bit FP registers.
41 def CSR_XLEN_F64_Interrupt: CalleeSavedRegs<(add CSR_Interrupt,
42 (sequence "F%u_D", 0, 31))>;
44 // Same as CSR_Interrupt, but excluding X16-X31.
45 def CSR_Interrupt_RVE : CalleeSavedRegs<(sub CSR_Interrupt,
46 (sequence "X%u", 16, 31))>;
48 // Same as CSR_XLEN_F32_Interrupt, but excluding X16-X31.
49 def CSR_XLEN_F32_Interrupt_RVE: CalleeSavedRegs<(sub CSR_XLEN_F32_Interrupt,
50 (sequence "X%u", 16, 31))>;
52 // Same as CSR_XLEN_F64_Interrupt, but excluding X16-X31.
53 def CSR_XLEN_F64_Interrupt_RVE: CalleeSavedRegs<(sub CSR_XLEN_F64_Interrupt,
54 (sequence "X%u", 16, 31))>;