| Chris Lattner | dc3adc8 | 2007-02-27 04:43:02 +0000 | [diff] [blame^] | 1 | //===-- llvm/CallingConvLower.cpp - Calling Conventions -------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file was developed by Chris Lattner and is distributed under |
| 6 | // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file implements the CCState class, used for lowering and implementing |
| 11 | // calling conventions. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #include "llvm/CodeGen/CallingConvLower.h" |
| 16 | #include "llvm/Target/MRegisterInfo.h" |
| 17 | using namespace llvm; |
| 18 | |
| 19 | CCState::CCState(const MRegisterInfo &mri) : MRI(mri) { |
| 20 | // No stack is used. |
| 21 | StackOffset = 0; |
| 22 | |
| 23 | UsedRegs.resize(MRI.getNumRegs()); |
| 24 | } |
| 25 | |
| 26 | |
| 27 | /// MarkAllocated - Mark a register and all of its aliases as allocated. |
| 28 | void CCState::MarkAllocated(unsigned Reg) { |
| 29 | UsedRegs[Reg/32] |= 1 << (Reg&31); |
| 30 | |
| 31 | if (const unsigned *RegAliases = MRI.getAliasSet(Reg)) |
| 32 | for (; (Reg = *RegAliases); ++RegAliases) |
| 33 | UsedRegs[Reg/32] |= 1 << (Reg&31); |
| 34 | } |