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Removed SimpleRewriter.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72880 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2009-06-04 18:45:36 +00:00
parent 1e07efd59d
commit ac2764040f
1 changed files with 2 additions and 82 deletions
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84
lib/CodeGen/VirtRegRewriter.cpp
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@ -33,99 +33,21 @@ STATISTIC(NumSUnfold , "Number of stores unfolded");
STATISTIC(NumModRefUnfold, "Number of modref unfolded");
namespace {
enum RewriterName { simple, local, trivial };
enum RewriterName { local, trivial };
}
static cl::opt<RewriterName>
RewriterOpt("rewriter",
cl::desc("Rewriter to use: (default: local)"),
cl::Prefix,
cl::values(clEnumVal(simple, "simple rewriter"),
clEnumVal(local, "local rewriter"),
cl::values(clEnumVal(local, "local rewriter"),
clEnumVal(trivial, "trivial rewriter"),
clEnumValEnd),
cl::init(local));
VirtRegRewriter::~VirtRegRewriter() {}
// ****************************** //
// Simple Spiller Implementation //
// ****************************** //
struct VISIBILITY_HIDDEN SimpleRewriter : public VirtRegRewriter {
bool runOnMachineFunction(MachineFunction &MF, VirtRegMap &VRM,
LiveIntervals* LIs) {
DOUT << "********** REWRITE MACHINE CODE **********\n";
DOUT << "********** Function: " << MF.getFunction()->getName() << '\n';
const TargetMachine &TM = MF.getTarget();
const TargetInstrInfo &TII = *TM.getInstrInfo();
const TargetRegisterInfo &TRI = *TM.getRegisterInfo();
// LoadedRegs - Keep track of which vregs are loaded, so that we only load
// each vreg once (in the case where a spilled vreg is used by multiple
// operands). This is always smaller than the number of operands to the
// current machine instr, so it should be small.
std::vector<unsigned> LoadedRegs;
for (MachineFunction::iterator MBBI = MF.begin(), E = MF.end();
MBBI != E; ++MBBI) {
DOUT << MBBI->getBasicBlock()->getName() << ":\n";
MachineBasicBlock &MBB = *MBBI;
for (MachineBasicBlock::iterator MII = MBB.begin(), E = MBB.end();
MII != E; ++MII) {
MachineInstr &MI = *MII;
for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) {
MachineOperand &MO = MI.getOperand(i);
if (MO.isReg() && MO.getReg()) {
if (TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
unsigned VirtReg = MO.getReg();
unsigned SubIdx = MO.getSubReg();
unsigned PhysReg = VRM.getPhys(VirtReg);
unsigned RReg = SubIdx ? TRI.getSubReg(PhysReg, SubIdx) : PhysReg;
if (!VRM.isAssignedReg(VirtReg)) {
int StackSlot = VRM.getStackSlot(VirtReg);
const TargetRegisterClass* RC =
MF.getRegInfo().getRegClass(VirtReg);
if (MO.isUse() &&
std::find(LoadedRegs.begin(), LoadedRegs.end(), VirtReg)
== LoadedRegs.end()) {
TII.loadRegFromStackSlot(MBB, &MI, PhysReg, StackSlot, RC);
MachineInstr *LoadMI = prior(MII);
VRM.addSpillSlotUse(StackSlot, LoadMI);
LoadedRegs.push_back(VirtReg);
++NumLoads;
DOUT << '\t' << *LoadMI;
}
if (MO.isDef()) {
TII.storeRegToStackSlot(MBB, next(MII), PhysReg, true,
StackSlot, RC);
MachineInstr *StoreMI = next(MII);
VRM.addSpillSlotUse(StackSlot, StoreMI);
++NumStores;
}
}
MF.getRegInfo().setPhysRegUsed(RReg);
MI.getOperand(i).setReg(RReg);
MI.getOperand(i).setSubReg(0);
} else {
MF.getRegInfo().setPhysRegUsed(MO.getReg());
}
}
}
DOUT << '\t' << MI;
LoadedRegs.clear();
}
}
return true;
}
};
/// This class is intended for use with the new spilling framework only. It
/// rewrites vreg def/uses to use the assigned preg, but does not insert any
@ -2231,8 +2153,6 @@ llvm::VirtRegRewriter* llvm::createVirtRegRewriter() {
default: assert(0 && "Unreachable!");
case local:
return new LocalRewriter();
case simple:
return new SimpleRewriter();
case trivial:
return new TrivialRewriter();
}