llvm-6502/lib/CodeGen/VirtRegMap.cpp
Alkis Evlogimenos 34d9bc9f16 Refactor VirtRegMap out of RegAllocLinearScan as the first part of bug
251 (providing a generic machine code rewriter/spiller).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11780 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23 23:08:11 +00:00

56 lines
2.0 KiB
C++

//===-- llvm/CodeGen/VirtRegMap.cpp - Virtual Register Map ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the virtual register map.
//
//===----------------------------------------------------------------------===//
#include "VirtRegMap.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "Support/Statistic.h"
#include <iostream>
using namespace llvm;
namespace {
Statistic<> numSpills("ra-linearscan", "Number of register spills");
}
int VirtRegMap::assignVirt2StackSlot(unsigned virtReg)
{
assert(MRegisterInfo::isVirtualRegister(virtReg));
assert(v2ssMap_[toIndex(virtReg)] == NO_STACK_SLOT &&
"attempt to assign stack slot to already spilled register");
const TargetRegisterClass* rc =
mf_->getSSARegMap()->getRegClass(virtReg);
int frameIndex = mf_->getFrameInfo()->CreateStackObject(rc);
v2ssMap_[toIndex(virtReg)] = frameIndex;
++numSpills;
return frameIndex;
}
std::ostream& llvm::operator<<(std::ostream& os, const VirtRegMap& vrm)
{
const MRegisterInfo* mri = vrm.mf_->getTarget().getRegisterInfo();
std::cerr << "********** REGISTER MAP **********\n";
for (unsigned i = 0, e = vrm.v2pMap_.size(); i != e; ++i) {
if (vrm.v2pMap_[i] != VirtRegMap::NO_PHYS_REG)
std::cerr << "[reg" << VirtRegMap::fromIndex(i) << " -> "
<< mri->getName(vrm.v2pMap_[i]) << "]\n";
}
for (unsigned i = 0, e = vrm.v2ssMap_.size(); i != e; ++i) {
if (vrm.v2ssMap_[i] != VirtRegMap::NO_STACK_SLOT)
std::cerr << "[reg" << VirtRegMap::fromIndex(i) << " -> fi#"
<< vrm.v2ssMap_[i] << "]\n";
}
return std::cerr << '\n';
}