1 //===- Nios2CallingConv.td - Calling Conventions for Nios2 -*- 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 // This describes the calling conventions for Nios2 architecture. 10 //===----------------------------------------------------------------------===// 11 12 /// CCIfSubtarget - Match if the current subtarget has a feature F. 13 class CCIfSubtarget<string F, CCAction A>: 14 CCIf<!strconcat("State.getTarget().getSubtarget<Nios2Subtarget>().", F), A>; 15 16 def CC_Nios2 : CallingConv<[ 17 // i32 f32 arguments get passed in integer registers if there is space. 18 CCIfType<[i32, f32], CCAssignToReg<[R4, R5, R6, R7]>>, 19 20 // Alternatively, they are assigned to the stack in 4-byte aligned units. 21 CCAssignToStack<4, 4> 22 ]>; 23 24 def RetCC_Nios2EABI : CallingConv<[ 25 // i32 are returned in registers R2, R3 26 CCIfType<[i32], CCAssignToReg<[R2, R3]>>, 27 // In case of floating point (FPH2 instr.) also use the same register set 28 CCIfType<[f32], CCAssignToReg<[R2, R3]>>, 29 CCIfByVal<CCPassByVal<4, 4>>, 30 // Stack parameter slots for i32 is 32-bit words and 4-byte aligned. 31 CCIfType<[i32], CCAssignToStack<4, 4>> 32 ]>; 33 34 def CSR : CalleeSavedRegs<(add RA, FP, (sequence "R%u", 16, 23))>; 35
