| //===- Nios2CallingConv.td - Calling Conventions for Nios2 -*- 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 Nios2 architecture. |
| //===----------------------------------------------------------------------===// |
| |
| /// CCIfSubtarget - Match if the current subtarget has a feature F. |
| class CCIfSubtarget<string F, CCAction A>: |
| CCIf<!strconcat("State.getTarget().getSubtarget<Nios2Subtarget>().", F), A>; |
| |
| def CC_Nios2 : CallingConv<[ |
| // i32 f32 arguments get passed in integer registers if there is space. |
| CCIfType<[i32, f32], CCAssignToReg<[R4, R5, R6, R7]>>, |
| |
| // Alternatively, they are assigned to the stack in 4-byte aligned units. |
| CCAssignToStack<4, 4> |
| ]>; |
| |
| def RetCC_Nios2EABI : CallingConv<[ |
| // i32 are returned in registers R2, R3 |
| CCIfType<[i32], CCAssignToReg<[R2, R3]>>, |
| // In case of floating point (FPH2 instr.) also use the same register set |
| CCIfType<[f32], CCAssignToReg<[R2, R3]>>, |
| CCIfByVal<CCPassByVal<4, 4>>, |
| // Stack parameter slots for i32 is 32-bit words and 4-byte aligned. |
| CCIfType<[i32], CCAssignToStack<4, 4>> |
| ]>; |
| |
| def CSR : CalleeSavedRegs<(add RA, FP, (sequence "R%u", 16, 23))>; |
