lib/Target/PowerPC/PPCCallingConv.td

//===- PPCCallingConv.td - Calling Conventions for PowerPC ------*- C++ -*-===//
// 
//                     The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
// 
//===----------------------------------------------------------------------===//
//
// This describes the calling conventions for the PowerPC 32- and 64-bit
// architectures.
//
//===----------------------------------------------------------------------===//

/// CCIfSubtarget - Match if the current subtarget has a feature F.
class CCIfSubtarget<string F, CCAction A>
 : CCIf<!strconcat("State.getTarget().getSubtarget<PPCSubtarget>().", F), A>;

//===----------------------------------------------------------------------===//
// Return Value Calling Convention
//===----------------------------------------------------------------------===//

// Return-value convention for PowerPC
def RetCC_PPC : CallingConv<[
  CCIfType<[i32], CCAssignToReg<[R3, R4]>>,
  CCIfType<[i64], CCAssignToReg<[X3, X4]>>,
  
  CCIfType<[f32, f64], CCAssignToReg<[F1]>>,
  
  // Vector types are always returned in V2.
  CCIfType<[v16i8, v8i16, v4i32, v4f32], CCAssignToReg<[V2]>>
]>;


//===----------------------------------------------------------------------===//
// PowerPC Argument Calling Conventions
//===----------------------------------------------------------------------===//
/*
def CC_PPC : CallingConv<[
  // The first 8 integer arguments are passed in integer registers.
  CCIfType<[i32], CCAssignToReg<[R3, R4, R5, R6, R7, R8, R9, R10]>>,
  CCIfType<[i64], CCAssignToReg<[X3, X4, X5, X6, X7, X8, X9, X10]>>,
  
  // Common sub-targets passes FP values in F1 - F13
  CCIfType<[f32, f64], CCIfSubtarget<"isMachoABI()",
           CCAssignToReg<[F1, F2, F3, F4, F5, F6, F7, F8,F9,F10,F11,F12,F13]>>>,
  // ELF32 sub-target pass FP values in F1 - F8.
  CCIfType<[f32, f64], CCAssignToReg<[F1, F2, F3, F4, F5, F6, F7, F8]>>,
           
  // The first 12 Vector arguments are passed in altivec registers.
  CCIfType<[v16i8, v8i16, v4i32, v4f32],
              CCAssignToReg<[V2, V3, V4, V5, V6, V7, V8, V9, V10,V11,V12,V13]>>

/*
  // Integer/FP values get stored in stack slots that are 8 bytes in size and
  // 8-byte aligned if there are no more registers to hold them.
  CCIfType<[i32, i64, f32, f64], CCAssignToStack<8, 8>>,
  
  // Vectors get 16-byte stack slots that are 16-byte aligned.
  CCIfType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
              CCAssignToStack<16, 16>>*/
]>;

*/