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move CC Lowering stuff to its own public interface

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34655 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-02-27 04:43:02 +00:00
parent 9c71ab77cd
commit 362e98a5f5
3 changed files with 200 additions and 146 deletions
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lib/CodeGen/SelectionDAG/CallingConvLower.cpp
+34
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//===-- llvm/CallingConvLower.cpp - Calling Conventions -------------------===//
//
// 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 file implements the CCState class, used for lowering and implementing
// calling conventions.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/Target/MRegisterInfo.h"
using namespace llvm;
CCState::CCState(const MRegisterInfo &mri) : MRI(mri) {
// No stack is used.
StackOffset = 0;
UsedRegs.resize(MRI.getNumRegs());
}
/// MarkAllocated - Mark a register and all of its aliases as allocated.
void CCState::MarkAllocated(unsigned Reg) {
UsedRegs[Reg/32] |= 1 << (Reg&31);
if (const unsigned *RegAliases = MRI.getAliasSet(Reg))
for (; (Reg = *RegAliases); ++RegAliases)
UsedRegs[Reg/32] |= 1 << (Reg&31);
}