1 //===- AlphaCallingConv.td - Calling Conventions for Alpha -*- 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 Alpha architecture. 10 //===----------------------------------------------------------------------===// 11 12 //===----------------------------------------------------------------------===// 13 // Alpha Return Value Calling Convention 14 //===----------------------------------------------------------------------===// 15 def RetCC_Alpha : CallingConv<[ 16 // i64 is returned in register R0 17 // R1 is an llvm extension, I don't know what gcc does 18 CCIfType<[i64], CCAssignToReg<[R0,R1]>>, 19 20 // f32 / f64 are returned in F0/F1 21 CCIfType<[f32, f64], CCAssignToReg<[F0, F1]>> 22 ]>; 23 24 //===----------------------------------------------------------------------===// 25 // Alpha Argument Calling Conventions 26 //===----------------------------------------------------------------------===// 27 def CC_Alpha : CallingConv<[ 28 // The first 6 arguments are passed in registers, whether integer or 29 // floating-point 30 CCIfType<[i64], CCAssignToRegWithShadow<[R16, R17, R18, R19, R20, R21], 31 [F16, F17, F18, F19, F20, F21]>>, 32 33 CCIfType<[f32, f64], CCAssignToRegWithShadow<[F16, F17, F18, F19, F20, F21], 34 [R16, R17, R18, R19, R20, R21]>>, 35 36 // Stack slots are 8 bytes in size and 8-byte aligned. 37 CCIfType<[i64, f32, f64], CCAssignToStack<8, 8>> 38 ]>; 39
