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35 lines
1.1 KiB
C++
35 lines
1.1 KiB
C++
//===-- llvm/CallingConvLower.cpp - Calling Conventions -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the CCState class, used for lowering and implementing
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// calling conventions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/Target/MRegisterInfo.h"
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using namespace llvm;
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CCState::CCState(const MRegisterInfo &mri) : MRI(mri) {
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// No stack is used.
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StackOffset = 0;
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UsedRegs.resize(MRI.getNumRegs());
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}
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/// MarkAllocated - Mark a register and all of its aliases as allocated.
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void CCState::MarkAllocated(unsigned Reg) {
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UsedRegs[Reg/32] |= 1 << (Reg&31);
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if (const unsigned *RegAliases = MRI.getAliasSet(Reg))
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for (; (Reg = *RegAliases); ++RegAliases)
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UsedRegs[Reg/32] |= 1 << (Reg&31);
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}
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