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Add the long awaited memory operand folding support for linear scan

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12058 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos
2004-03-01 20:05:10 +00:00
parent 9d0802e7dd
commit 5f37502bfb
6 changed files with 89 additions and 30 deletions
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39
lib/CodeGen/VirtRegMap.cpp
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@ -19,6 +19,7 @@
#include "VirtRegMap.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "Support/Statistic.h"
@ -49,6 +50,24 @@ int VirtRegMap::assignVirt2StackSlot(unsigned virtReg)
return frameIndex;
}
void VirtRegMap::virtFolded(unsigned virtReg,
MachineInstr* oldMI,
MachineInstr* newMI)
{
// move previous memory references folded to new instruction
MI2VirtMap::iterator i, e;
std::vector<MI2VirtMap::mapped_type> regs;
for (tie(i, e) = mi2vMap_.equal_range(oldMI); i != e; ) {
regs.push_back(i->second);
mi2vMap_.erase(i++);
}
for (unsigned i = 0, e = regs.size(); i != e; ++i)
mi2vMap_.insert(std::make_pair(newMI, i));
// add new memory reference
mi2vMap_.insert(std::make_pair(newMI, virtReg));
}
std::ostream& llvm::operator<<(std::ostream& os, const VirtRegMap& vrm)
{
const MRegisterInfo* mri = vrm.mf_->getTarget().getRegisterInfo();
@ -129,9 +148,9 @@ namespace {
vrm_.getStackSlot(virtReg),
mri_.getRegClass(physReg));
++numStores;
DEBUG(std::cerr << "\t\tadded: ";
DEBUG(std::cerr << "added: ";
prior(nextLastRef)->print(std::cerr, tm_);
std::cerr << "\t\tafter: ";
std::cerr << "after: ";
lastDef->print(std::cerr, tm_));
lastDef_[virtReg] = 0;
}
@ -161,10 +180,8 @@ namespace {
vrm_.getStackSlot(virtReg),
mri_.getRegClass(physReg));
++numLoads;
DEBUG(std::cerr << "\t\tadded: ";
prior(mii)->print(std::cerr,tm_);
std::cerr << "\t\tbefore: ";
mii->print(std::cerr, tm_));
DEBUG(std::cerr << "added: ";
prior(mii)->print(std::cerr,tm_));
lastDef_[virtReg] = mii;
}
}
@ -186,6 +203,16 @@ namespace {
void eliminateVirtRegsInMbb(MachineBasicBlock& mbb) {
for (MachineBasicBlock::iterator mii = mbb.begin(),
mie = mbb.end(); mii != mie; ++mii) {
// if we have references to memory operands make sure
// we clear all physical registers that may contain
// the value of the spilled virtual register
VirtRegMap::MI2VirtMap::const_iterator i, e;
for (tie(i, e) = vrm_.getFoldedVirts(mii); i != e; ++i) {
unsigned physReg = vrm_.getPhys(i->second);
if (physReg) vacateJustPhysReg(mbb, mii, physReg);
}
// rewrite all used operands
for (unsigned i = 0, e = mii->getNumOperands(); i != e; ++i) {
MachineOperand& op = mii->getOperand(i);