| Anton Korobeynikov | 32b7d5b | 2009-07-16 13:27:25 +0000 | [diff] [blame] | 1 | //=- SystemZCallingConv.td - Calling Conventions for SystemZ -*- 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 SystemZ architecture. |
| 10 | //===----------------------------------------------------------------------===// |
| 11 | |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | // SystemZ Return Value Calling Convention |
| 14 | //===----------------------------------------------------------------------===// |
| 15 | def RetCC_SystemZ : CallingConv<[ |
| 16 | // i64 is returned in register R2 |
| 17 | CCIfType<[i64], CCAssignToReg<[R2]>> |
| 18 | ]>; |
| 19 | |
| 20 | //===----------------------------------------------------------------------===// |
| 21 | // SystemZ Argument Calling Conventions |
| 22 | //===----------------------------------------------------------------------===// |
| 23 | def CC_SystemZ : CallingConv<[ |
| 24 | // Promote i8/i16/i32 arguments to i64. |
| 25 | CCIfType<[i8, i16, i32], CCPromoteToType<i64>>, |
| 26 | |
| 27 | // The first 5 integer arguments of non-varargs functions are passed in |
| 28 | // integer registers. |
| 29 | // FIXME: Check stuff for varagrs |
| 30 | CCIfNotVarArg<CCIfType<[i64], |
| 31 | CCAssignToReg<[R2, R3, R4, R5, R6]>>>, |
| 32 | |
| 33 | // Integer values get stored in stack slots that are 8 bytes in |
| 34 | // size and 8-byte aligned. |
| 35 | CCIfType<[i64], CCAssignToStack<8, 8>> |
| 36 | ]>; |