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Just turn aggressive stack coloring off at -O3.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71140 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2009-05-07 01:33:38 +00:00
parent d0c1f9c932
commit 2c1d7726f2
3 changed files with 24 additions and 11 deletions
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2
include/llvm/CodeGen/Passes.h
View File

@ -191,7 +191,7 @@ namespace llvm {
FunctionPass *createMachineSinkingPass();
/// createStackSlotColoringPass - This pass performs stack slot coloring.
FunctionPass *createStackSlotColoringPass();
FunctionPass *createStackSlotColoringPass(bool);
/// createStackProtectorPass - This pass adds stack protectors to functions.
FunctionPass *createStackProtectorPass(const TargetLowering *tli);

3
lib/CodeGen/LLVMTargetMachine.cpp
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@ -193,7 +193,8 @@ bool LLVMTargetMachine::addCommonCodeGenPasses(PassManagerBase &PM,
// Perform stack slot coloring.
if (OptLevel != CodeGenOpt::None)
PM.add(createStackSlotColoringPass());
PM.add(createStackSlotColoringPass(false));
/*OptLevel >= CodeGenOpt::Aggressive*/
if (PrintMachineCode) // Print the register-allocated code
PM.add(createMachineFunctionPrinterPass(cerr));

30
lib/CodeGen/StackSlotColoring.cpp
View File

@ -37,21 +37,22 @@ DisableSharing("no-stack-slot-sharing",
cl::desc("Suppress slot sharing during stack coloring"));
static cl::opt<bool>
ColorWithRegs("color-ss-with-regs",
cl::init(false), cl::Hidden,
cl::desc("Color stack slots with free registers"));
ColorWithRegsOpt("color-ss-with-regs",
cl::init(false), cl::Hidden,
cl::desc("Color stack slots with free registers"));
static cl::opt<int> DCELimit("ssc-dce-limit", cl::init(-1), cl::Hidden);
STATISTIC(NumEliminated, "Number of stack slots eliminated due to coloring");
STATISTIC(NumRegRepl, "Number of stack slot refs replaced with reg refs");
STATISTIC(NumLoadElim, "Number of load eliminated");
STATISTIC(NumLoadElim, "Number of loads eliminated");
STATISTIC(NumStoreElim, "Number of stores eliminated");
STATISTIC(NumDead, "Number of trivially dead stack accesses eliminated");
namespace {
class VISIBILITY_HIDDEN StackSlotColoring : public MachineFunctionPass {
bool ColorWithRegs;
LiveStacks* LS;
VirtRegMap* VRM;
MachineFrameInfo *MFI;
@ -89,7 +90,10 @@ namespace {
public:
static char ID; // Pass identification
StackSlotColoring() : MachineFunctionPass(&ID), NextColor(-1) {}
StackSlotColoring() :
MachineFunctionPass(&ID), ColorWithRegs(false), NextColor(-1) {}
StackSlotColoring(bool RegColor) :
MachineFunctionPass(&ID), ColorWithRegs(RegColor), NextColor(-1) {}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<LiveStacks>();
@ -136,8 +140,8 @@ char StackSlotColoring::ID = 0;
static RegisterPass<StackSlotColoring>
X("stack-slot-coloring", "Stack Slot Coloring");
FunctionPass *llvm::createStackSlotColoringPass() {
return new StackSlotColoring();
FunctionPass *llvm::createStackSlotColoringPass(bool RegColor) {
return new StackSlotColoring(RegColor);
}
namespace {
@ -231,7 +235,7 @@ bool
StackSlotColoring::ColorSlotsWithFreeRegs(SmallVector<int, 16> &SlotMapping,
SmallVector<SmallVector<int, 4>, 16> &RevMap,
BitVector &SlotIsReg) {
if (!ColorWithRegs || !VRM->HasUnusedRegisters())
if (!(ColorWithRegs || ColorWithRegsOpt) || !VRM->HasUnusedRegisters())
return false;
bool Changed = false;
@ -239,7 +243,9 @@ StackSlotColoring::ColorSlotsWithFreeRegs(SmallVector<int, 16> &SlotMapping,
for (unsigned i = 0, e = SSIntervals.size(); i != e; ++i) {
LiveInterval *li = SSIntervals[i];
int SS = li->getStackSlotIndex();
if (!UsedColors[SS])
if (!UsedColors[SS] || li->weight < 20)
// If the weight is < 20, i.e. two references in a loop with depth 1,
// don't bother with it.
continue;
// These slots allow to share the same registers.
@ -472,6 +478,9 @@ void StackSlotColoring::RewriteInstruction(MachineInstr *MI, int OldFI,
bool StackSlotColoring::PropagateBackward(MachineBasicBlock::iterator MII,
MachineBasicBlock *MBB,
unsigned OldReg, unsigned NewReg) {
if (MII == MBB->begin())
return false;
SmallVector<MachineOperand*, 4> Refs;
while (--MII != MBB->begin()) {
bool FoundDef = false; // Not counting 2address def.
@ -522,6 +531,9 @@ bool StackSlotColoring::PropagateBackward(MachineBasicBlock::iterator MII,
bool StackSlotColoring::PropagateForward(MachineBasicBlock::iterator MII,
MachineBasicBlock *MBB,
unsigned OldReg, unsigned NewReg) {
if (MII == MBB->end())
return false;
SmallVector<MachineOperand*, 4> Uses;
while (++MII != MBB->end()) {
bool FoundUse = false;