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Fix more stack layout issues in the MBlaze backend.

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llvm-svn: 122778
This commit is contained in:
Wesley Peck 2011-01-03 21:40:26 +00:00
parent a52e5dbdfa
commit d22aae0d68
3 changed files with 40 additions and 25 deletions
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46
lib/Target/MBlaze/MBlazeFrameInfo.cpp
View File

@ -40,6 +40,35 @@ namespace llvm {
cl::Hidden);
}
static void replaceFrameIndexes(MachineFunction &MF,
SmallVector<std::pair<int,int64_t>, 16> &FR) {
MachineFrameInfo *MFI = MF.getFrameInfo();
const SmallVector<std::pair<int,int64_t>, 16>::iterator FRB = FR.begin();
const SmallVector<std::pair<int,int64_t>, 16>::iterator FRE = FR.end();
SmallVector<std::pair<int,int64_t>, 16>::iterator FRI = FRB;
for (; FRI != FRE; ++FRI) {
MFI->RemoveStackObject(FRI->first);
int NFI = MFI->CreateFixedObject(4, FRI->second, true);
for (MachineFunction::iterator MB=MF.begin(), ME=MF.end(); MB!=ME; ++MB) {
MachineBasicBlock::iterator MBB = MB->begin();
const MachineBasicBlock::iterator MBE = MB->end();
for (; MBB != MBE; ++MBB) {
MachineInstr::mop_iterator MIB = MBB->operands_begin();
const MachineInstr::mop_iterator MIE = MBB->operands_end();
for (MachineInstr::mop_iterator MII = MIB; MII != MIE; ++MII) {
if (!MII->isFI() || MII->getIndex() != FRI->first) continue;
DEBUG(dbgs() << "FOUND FI#" << MII->getIndex() << "\n");
MII->setIndex(NFI);
}
}
}
}
}
//===----------------------------------------------------------------------===//
//
// Stack Frame Processing methods
@ -64,6 +93,7 @@ static void analyzeFrameIndexes(MachineFunction &MF) {
MachineRegisterInfo::livein_iterator LIE = MRI.livein_end();
const SmallVector<int, 16> &LiveInFI = MBlazeFI->getLiveIn();
SmallVector<MachineInstr*, 16> EraseInstr;
SmallVector<std::pair<int,int64_t>, 16> FrameRelocate;
MachineBasicBlock *MBB = MF.getBlockNumbered(0);
MachineBasicBlock::iterator MIB = MBB->begin();
@ -87,7 +117,6 @@ static void analyzeFrameIndexes(MachineFunction &MF) {
//
// Additionally, if the SWI operation kills the def of REG then we don't
// need the LWI operation so we can erase it as well.
#if 1
for (unsigned i = 0, e = LiveInFI.size(); i < e; ++i) {
for (MachineBasicBlock::iterator I=MIB; I != MIE; ++I) {
if (I->getOpcode() != MBlaze::LWI || I->getNumOperands() != 3 ||
@ -117,7 +146,7 @@ static void analyzeFrameIndexes(MachineFunction &MF) {
EraseInstr.push_back(SI);
DEBUG(dbgs() << "SWI for FI#" << FI << " removed\n");
MBlazeFI->recordLoadArgsFI(FI, StackOffset);
FrameRelocate.push_back(std::make_pair(FI,StackOffset));
DEBUG(dbgs() << "FI#" << FI << " relocated to " << StackOffset << "\n");
StackOffset -= 4;
@ -126,7 +155,6 @@ static void analyzeFrameIndexes(MachineFunction &MF) {
}
}
}
#endif
// In this loop we are searching for frame indexes that corrospond to
// incoming arguments that are in registers. We look for instruction
@ -139,7 +167,6 @@ static void analyzeFrameIndexes(MachineFunction &MF) {
// caller has allocated stack space for it already. Instead of allocating
// stack space on our frame, we record the correct location in the callers
// frame.
#if 1
for (MachineRegisterInfo::livein_iterator LI = LII; LI != LIE; ++LI) {
for (MachineBasicBlock::iterator I=MIB; I != MIE; ++I) {
if (I->definesRegister(LI->first))
@ -165,21 +192,21 @@ static void analyzeFrameIndexes(MachineFunction &MF) {
}
StackAdjust += 4;
MBlazeFI->recordLoadArgsFI(FI, FILoc);
FrameRelocate.push_back(std::make_pair(FI,FILoc));
DEBUG(dbgs() << "FI#" << FI << " relocated to " << FILoc << "\n");
break;
}
}
}
#endif
// Go ahead and erase all of the instructions that we determined were
// no longer needed.
for (int i = 0, e = EraseInstr.size(); i < e; ++i)
MBB->erase(EraseInstr[i]);
DEBUG(dbgs() << "Final stack adjustment: " << StackAdjust << "\n");
MBlazeFI->setStackAdjust(StackAdjust);
// Replace all of the frame indexes that we have relocated with new
// fixed object frame indexes.
replaceFrameIndexes(MF, FrameRelocate);
}
static void interruptFrameLayout(MachineFunction &MF) {
@ -282,9 +309,6 @@ static void determineFrameLayout(MachineFunction &MF) {
unsigned FrameSize = MFI->getStackSize();
DEBUG(dbgs() << "Original Frame Size: " << FrameSize << "\n" );
FrameSize -= MBlazeFI->getStackAdjust();
DEBUG(dbgs() << "Adjusted Frame Size: " << FrameSize << "\n" );
// Get the alignments provided by the target, and the maximum alignment
// (if any) of the fixed frame objects.
// unsigned MaxAlign = MFI->getMaxAlignment();

14
lib/Target/MBlaze/MBlazeMachineFunction.h
View File

@ -34,9 +34,6 @@ private:
/// saved. This is used on Prologue and Epilogue to emit RA save/restore
int RAStackOffset;
/// Holds the stack adjustment necessary for each function.
int StackAdjust;
/// MBlazeFIHolder - Holds a FrameIndex and it's Stack Pointer Offset
struct MBlazeFIHolder {
@ -85,9 +82,9 @@ private:
public:
MBlazeFunctionInfo(MachineFunction& MF)
: FPStackOffset(0), RAStackOffset(0), StackAdjust(0), GPHolder(-1,-1),
HasLoadArgs(false), HasStoreVarArgs(false), SRetReturnReg(0),
GlobalBaseReg(0), VarArgsFrameIndex(0), LiveInFI()
: FPStackOffset(0), RAStackOffset(0), GPHolder(-1,-1), HasLoadArgs(false),
HasStoreVarArgs(false), SRetReturnReg(0), GlobalBaseReg(0),
VarArgsFrameIndex(0), LiveInFI()
{}
int getFPStackOffset() const { return FPStackOffset; }
@ -96,9 +93,6 @@ public:
int getRAStackOffset() const { return RAStackOffset; }
void setRAStackOffset(int Off) { RAStackOffset = Off; }
int getStackAdjust() const { return StackAdjust; }
void setStackAdjust(int Adj) { StackAdjust = Adj; }
int getGPStackOffset() const { return GPHolder.SPOffset; }
int getGPFI() const { return GPHolder.FI; }
void setGPStackOffset(int Off) { GPHolder.SPOffset = Off; }
@ -125,6 +119,7 @@ public:
if (!HasLoadArgs) HasLoadArgs=true;
FnLoadArgs.push_back(MBlazeFIHolder(FI, SPOffset));
}
void recordStoreVarArgsFI(int FI, int SPOffset) {
if (!HasStoreVarArgs) HasStoreVarArgs=true;
FnStoreVarArgs.push_back(MBlazeFIHolder(FI, SPOffset));
@ -135,6 +130,7 @@ public:
for (unsigned i = 0, e = FnLoadArgs.size(); i != e; ++i)
MFI->setObjectOffset(FnLoadArgs[i].FI, FnLoadArgs[i].SPOffset);
}
void adjustStoreVarArgsFI(MachineFrameInfo *MFI) const {
if (!hasStoreVarArgs()) return;
for (unsigned i = 0, e = FnStoreVarArgs.size(); i != e; ++i)

5
lib/Target/MBlaze/MBlazeRegisterInfo.cpp
View File

@ -296,11 +296,6 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
// and adjust SPOffsets considering the final stack size.
int Offset = (spOffset < 0) ? (stackSize - spOffset) : spOffset;
Offset += MI.getOperand(oi).getImm();
if (!MFI->isFixedObjectIndex(FrameIndex) &&
!MFI->isSpillSlotObjectIndex(FrameIndex) &&
!MBlazeFI->isLiveIn(FrameIndex) &&
spOffset >= 0)
Offset -= MBlazeFI->getStackAdjust();
DEBUG(dbgs() << "Offset : " << Offset << "\n" << "<--------->\n");