1//===-- RISCVCallingConv.td - Calling Conventions RISCV ----*- tablegen -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This describes the calling conventions for the RISCV architecture.
11//
12//===----------------------------------------------------------------------===//
13
14// RISCV 32-bit C return-value convention.
15def RetCC_RISCV32 : CallingConv<[CCIfType<[i32], CCAssignToReg<[X10, X11]>>]>;
16
17// RISCV 32-bit C Calling convention.
18def CC_RISCV32 : CallingConv<[
19  // Promote i8/i16 args to i32
20  CCIfType<[ i8, i16 ], CCPromoteToType<i32>>,
21
22  // All arguments get passed in integer registers if there is space.
23  CCIfType<[i32], CCAssignToReg<[ X10, X11, X12, X13, X14, X15, X16, X17]>>,
24
25  // Could be assigned to the stack in 8-byte aligned units, but unsupported
26  CCAssignToStack<8, 8>
27]>;
28
29def CSR : CalleeSavedRegs<(add X1, X3, X4, X8, X9, (sequence "X%u", 18, 27))>;
30