Fix ARM hasFP() semantics. It should return true whenever FP register is
reserved, not available for general allocation. This eliminates all the
extra checks for Darwin.
This change also fixes the use of FP to access frame indices in leaf
functions and cleaned up some confusing code in epilogue emission.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110655 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
index ee1a82e..c8cc870 100644
--- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp
+++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp
@@ -177,7 +177,7 @@
Reserved.set(ARM::SP);
Reserved.set(ARM::PC);
Reserved.set(ARM::FPSCR);
- if (STI.isTargetDarwin() || hasFP(MF))
+ if (hasFP(MF))
Reserved.set(FramePtr);
// Some targets reserve R9.
if (STI.isR9Reserved())
@@ -194,7 +194,7 @@
return true;
case ARM::R7:
case ARM::R11:
- if (FramePtr == Reg && (STI.isTargetDarwin() || hasFP(MF)))
+ if (FramePtr == Reg && hasFP(MF))
return true;
break;
case ARM::R9:
@@ -511,7 +511,7 @@
return std::make_pair(RC->allocation_order_begin(MF),
RC->allocation_order_end(MF));
- if (!STI.isTargetDarwin() && !hasFP(MF)) {
+ if (!hasFP(MF)) {
if (!STI.isR9Reserved())
return std::make_pair(GPREven1,
GPREven1 + (sizeof(GPREven1)/sizeof(unsigned)));
@@ -540,7 +540,7 @@
return std::make_pair(RC->allocation_order_begin(MF),
RC->allocation_order_end(MF));
- if (!STI.isTargetDarwin() && !hasFP(MF)) {
+ if (!hasFP(MF)) {
if (!STI.isR9Reserved())
return std::make_pair(GPROdd1,
GPROdd1 + (sizeof(GPROdd1)/sizeof(unsigned)));
@@ -610,6 +610,10 @@
/// or if frame pointer elimination is disabled.
///
bool ARMBaseRegisterInfo::hasFP(const MachineFunction &MF) const {
+ // Mac OS X requires FP not to be clobbered for backtracing purpose.
+ if (STI.isTargetDarwin())
+ return true;
+
const MachineFrameInfo *MFI = MF.getFrameInfo();
// Always eliminate non-leaf frame pointers.
return ((DisableFramePointerElim(MF) && MFI->hasCalls()) ||
@@ -683,6 +687,7 @@
/// instructions will require a scratch register during their expansion later.
unsigned
ARMBaseRegisterInfo::estimateRSStackSizeLimit(MachineFunction &MF) const {
+ const ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
unsigned Limit = (1 << 12) - 1;
for (MachineFunction::iterator BB = MF.begin(),E = MF.end(); BB != E; ++BB) {
for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end();
@@ -708,7 +713,10 @@
Limit = std::min(Limit, ((1U << 8) - 1) * 4);
break;
case ARMII::AddrModeT2_i12:
- if (hasFP(MF)) Limit = std::min(Limit, (1U << 8) - 1);
+ // i12 supports only positive offset so these will be converted to
+ // i8 opcodes. See llvm::rewriteT2FrameIndex.
+ if (hasFP(MF) && AFI->hasStackFrame())
+ Limit = std::min(Limit, (1U << 8) - 1);
break;
case ARMII::AddrMode6:
// Addressing mode 6 (load/store) instructions can't encode an
@@ -860,8 +868,9 @@
// and which instructions will need a scratch register for them. Is it
// worth the effort and added fragility?
bool BigStack =
- (RS && (estimateStackSize(MF) + (hasFP(MF) ? 4:0) >=
- estimateRSStackSizeLimit(MF)))
+ (RS &&
+ (estimateStackSize(MF) + ((hasFP(MF) && AFI->hasStackFrame()) ? 4:0) >=
+ estimateRSStackSizeLimit(MF)))
|| MFI->hasVarSizedObjects()
|| (MFI->adjustsStack() && !canSimplifyCallFramePseudos(MF));
@@ -881,9 +890,7 @@
ExtraCSSpill = true;
}
- // Darwin ABI requires FP to point to the stack slot that contains the
- // previous FP.
- if (STI.isTargetDarwin() || hasFP(MF)) {
+ if (hasFP(MF)) {
MF.getRegInfo().setPhysRegUsed(FramePtr);
NumGPRSpills++;
}
@@ -976,7 +983,7 @@
unsigned
ARMBaseRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
- if (STI.isTargetDarwin() || hasFP(MF))
+ if (hasFP(MF))
return FramePtr;
return ARM::SP;
}
@@ -1546,7 +1553,8 @@
// Otherwise, if this is not Darwin, all the callee-saved registers go
// into spill area 1, including the FP in R11. In either case, it is
// now safe to emit this assignment.
- if (STI.isTargetDarwin() || hasFP(MF)) {
+ bool HasFP = hasFP(MF);
+ if (HasFP) {
unsigned ADDriOpc = !AFI->isThumbFunction() ? ARM::ADDri : ARM::t2ADDri;
MachineInstrBuilder MIB =
BuildMI(MBB, MBBI, dl, TII.get(ADDriOpc), FramePtr)
@@ -1565,7 +1573,7 @@
unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
- if (STI.isTargetDarwin() || hasFP(MF))
+ if (HasFP)
AFI->setFramePtrSpillOffset(MFI->getObjectOffset(FramePtrSpillFI) +
NumBytes);
AFI->setGPRCalleeSavedArea1Offset(GPRCS1Offset);
@@ -1577,11 +1585,14 @@
if (NumBytes) {
// Adjust SP after all the callee-save spills.
emitSPUpdate(isARM, MBB, MBBI, dl, TII, -NumBytes);
+ if (HasFP)
+ AFI->setShouldRestoreSPFromFP(true);
}
if (STI.isTargetELF() && hasFP(MF)) {
MFI->setOffsetAdjustment(MFI->getOffsetAdjustment() -
AFI->getFramePtrSpillOffset());
+ AFI->setShouldRestoreSPFromFP(true);
}
AFI->setGPRCalleeSavedArea1Size(GPRCS1Size);
@@ -1614,6 +1625,8 @@
BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVtgpr2gpr), ARM::SP)
.addReg(ARM::R4, RegState::Kill);
}
+
+ AFI->setShouldRestoreSPFromFP(true);
}
}
@@ -1669,34 +1682,25 @@
AFI->getGPRCalleeSavedArea2Size() +
AFI->getDPRCalleeSavedAreaSize());
- // Darwin ABI requires FP to point to the stack slot that contains the
- // previous FP.
- bool HasFP = hasFP(MF);
- if ((STI.isTargetDarwin() && NumBytes) || HasFP) {
+ // Reset SP based on frame pointer only if the stack frame extends beyond
+ // frame pointer stack slot or target is ELF and the function has FP.
+ if (AFI->shouldRestoreSPFromFP()) {
NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
- // Reset SP based on frame pointer only if the stack frame extends beyond
- // frame pointer stack slot or target is ELF and the function has FP.
- if (HasFP ||
- AFI->getGPRCalleeSavedArea2Size() ||
- AFI->getDPRCalleeSavedAreaSize() ||
- AFI->getDPRCalleeSavedAreaOffset()) {
- if (NumBytes) {
- if (isARM)
- emitARMRegPlusImmediate(MBB, MBBI, dl, ARM::SP, FramePtr, -NumBytes,
- ARMCC::AL, 0, TII);
- else
- emitT2RegPlusImmediate(MBB, MBBI, dl, ARM::SP, FramePtr, -NumBytes,
- ARMCC::AL, 0, TII);
- } else {
- // Thumb2 or ARM.
- if (isARM)
- BuildMI(MBB, MBBI, dl, TII.get(ARM::MOVr), ARM::SP)
- .addReg(FramePtr)
- .addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
- else
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVgpr2gpr), ARM::SP)
- .addReg(FramePtr);
- }
+ if (NumBytes) {
+ if (isARM)
+ emitARMRegPlusImmediate(MBB, MBBI, dl, ARM::SP, FramePtr, -NumBytes,
+ ARMCC::AL, 0, TII);
+ else
+ emitT2RegPlusImmediate(MBB, MBBI, dl, ARM::SP, FramePtr, -NumBytes,
+ ARMCC::AL, 0, TII);
+ } else {
+ // Thumb2 or ARM.
+ if (isARM)
+ BuildMI(MBB, MBBI, dl, TII.get(ARM::MOVr), ARM::SP)
+ .addReg(FramePtr).addImm((unsigned)ARMCC::AL).addReg(0).addReg(0);
+ else
+ BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVgpr2gpr), ARM::SP)
+ .addReg(FramePtr);
}
} else if (NumBytes)
emitSPUpdate(isARM, MBB, MBBI, dl, TII, NumBytes);
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index db550b1..c3d60ad 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -742,14 +742,15 @@
unsigned
ARMTargetLowering::getRegPressureLimit(const TargetRegisterClass *RC,
MachineFunction &MF) const {
- unsigned FPDiff = RegInfo->hasFP(MF) ? 1 : 0;
switch (RC->getID()) {
default:
return 0;
case ARM::tGPRRegClassID:
- return 5 - FPDiff;
- case ARM::GPRRegClassID:
- return 10 - FPDiff - (Subtarget->isR9Reserved() ? 1 : 0);
+ return RegInfo->hasFP(MF) ? 4 : 5;
+ case ARM::GPRRegClassID: {
+ unsigned FP = RegInfo->hasFP(MF) ? 1 : 0;
+ return 10 - FP - (Subtarget->isR9Reserved() ? 1 : 0);
+ }
case ARM::SPRRegClassID: // Currently not used as 'rep' register class.
case ARM::DPRRegClassID:
return 32 - 10;
diff --git a/lib/Target/ARM/ARMMachineFunctionInfo.h b/lib/Target/ARM/ARMMachineFunctionInfo.h
index 7e57a1c..514c26b 100644
--- a/lib/Target/ARM/ARMMachineFunctionInfo.h
+++ b/lib/Target/ARM/ARMMachineFunctionInfo.h
@@ -43,6 +43,10 @@
/// processFunctionBeforeCalleeSavedScan().
bool HasStackFrame;
+ /// RestoreSPFromFP - True if epilogue should restore SP from FP. Set by
+ /// emitPrologue.
+ bool RestoreSPFromFP;
+
/// LRSpilledForFarJump - True if the LR register has been for spilled to
/// enable far jump.
bool LRSpilledForFarJump;
@@ -95,7 +99,7 @@
ARMFunctionInfo() :
isThumb(false),
hasThumb2(false),
- VarArgsRegSaveSize(0), HasStackFrame(false),
+ VarArgsRegSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
LRSpilledForFarJump(false),
FramePtrSpillOffset(0), GPRCS1Offset(0), GPRCS2Offset(0), DPRCSOffset(0),
GPRCS1Size(0), GPRCS2Size(0), DPRCSSize(0),
@@ -106,7 +110,7 @@
explicit ARMFunctionInfo(MachineFunction &MF) :
isThumb(MF.getTarget().getSubtarget<ARMSubtarget>().isThumb()),
hasThumb2(MF.getTarget().getSubtarget<ARMSubtarget>().hasThumb2()),
- VarArgsRegSaveSize(0), HasStackFrame(false),
+ VarArgsRegSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
LRSpilledForFarJump(false),
FramePtrSpillOffset(0), GPRCS1Offset(0), GPRCS2Offset(0), DPRCSOffset(0),
GPRCS1Size(0), GPRCS2Size(0), DPRCSSize(0),
@@ -125,6 +129,9 @@
bool hasStackFrame() const { return HasStackFrame; }
void setHasStackFrame(bool s) { HasStackFrame = s; }
+ bool shouldRestoreSPFromFP() const { return RestoreSPFromFP; }
+ void setShouldRestoreSPFromFP(bool s) { RestoreSPFromFP = s; }
+
bool isLRSpilledForFarJump() const { return LRSpilledForFarJump; }
void setLRIsSpilledForFarJump(bool s) { LRSpilledForFarJump = s; }
diff --git a/lib/Target/ARM/ARMRegisterInfo.td b/lib/Target/ARM/ARMRegisterInfo.td
index 5e17175..2b72739 100644
--- a/lib/Target/ARM/ARMRegisterInfo.td
+++ b/lib/Target/ARM/ARMRegisterInfo.td
@@ -294,8 +294,7 @@
if (Subtarget.isThumb1Only()) {
I = THUMB_GPR_AO + (sizeof(THUMB_GPR_AO)/sizeof(unsigned));
- // Mac OS X requires FP not to be clobbered for backtracing purpose.
- return (Subtarget.isTargetDarwin() || RI->hasFP(MF)) ? I-1 : I;
+ return RI->hasFP(MF) ? I-1 : I;
}
if (Subtarget.isTargetDarwin()) {
@@ -312,8 +311,7 @@
I = ARM_GPR_AO_1 + (sizeof(ARM_GPR_AO_1)/sizeof(unsigned));
}
- // Mac OS X requires FP not to be clobbered for backtracing purpose.
- return (Subtarget.isTargetDarwin() || RI->hasFP(MF)) ? I-1 : I;
+ return RI->hasFP(MF) ? I-1 : I;
}
}];
}
@@ -403,8 +401,7 @@
if (Subtarget.isThumb1Only()) {
I = THUMB_rGPRAO + (sizeof(THUMB_rGPRAO)/sizeof(unsigned));
- // Mac OS X requires FP not to be clobbered for backtracing purpose.
- return (Subtarget.isTargetDarwin() || RI->hasFP(MF)) ? I-1 : I;
+ return RI->hasFP(MF) ? I-1 : I;
}
if (Subtarget.isTargetDarwin()) {
@@ -421,8 +418,7 @@
I = ARM_rGPRAO_1 + (sizeof(ARM_rGPRAO_1)/sizeof(unsigned));
}
- // Mac OS X requires FP not to be clobbered for backtracing purpose.
- return (Subtarget.isTargetDarwin() || RI->hasFP(MF)) ? I-1 : I;
+ return RI->hasFP(MF) ? I-1 : I;
}
}];
}
@@ -449,11 +445,9 @@
tGPRClass::allocation_order_end(const MachineFunction &MF) const {
const TargetMachine &TM = MF.getTarget();
const TargetRegisterInfo *RI = TM.getRegisterInfo();
- const ARMSubtarget &Subtarget = TM.getSubtarget<ARMSubtarget>();
tGPRClass::iterator I =
THUMB_tGPR_AO + (sizeof(THUMB_tGPR_AO)/sizeof(unsigned));
- // Mac OS X requires FP not to be clobbered for backtracing purpose.
- return (Subtarget.isTargetDarwin() || RI->hasFP(MF)) ? I-1 : I;
+ return RI->hasFP(MF) ? I-1 : I;
}
}];
}
diff --git a/lib/Target/ARM/Thumb1RegisterInfo.cpp b/lib/Target/ARM/Thumb1RegisterInfo.cpp
index 9ae3145..50328e3 100644
--- a/lib/Target/ARM/Thumb1RegisterInfo.cpp
+++ b/lib/Target/ARM/Thumb1RegisterInfo.cpp
@@ -742,11 +742,11 @@
dl = MBBI->getDebugLoc();
}
- // Darwin ABI requires FP to point to the stack slot that contains the
- // previous FP.
- if (STI.isTargetDarwin() || hasFP(MF)) {
+ // Adjust FP so it point to the stack slot that contains the previous FP.
+ if (hasFP(MF)) {
BuildMI(MBB, MBBI, dl, TII.get(ARM::tADDrSPi), FramePtr)
.addFrameIndex(FramePtrSpillFI).addImm(0);
+ AFI->setShouldRestoreSPFromFP(true);
}
// Determine starting offsets of spill areas.
@@ -764,10 +764,9 @@
emitSPUpdate(MBB, MBBI, TII, dl, *this, -NumBytes);
}
- if (STI.isTargetELF() && hasFP(MF)) {
+ if (STI.isTargetELF() && hasFP(MF))
MFI->setOffsetAdjustment(MFI->getOffsetAdjustment() -
AFI->getFramePtrSpillOffset());
- }
AFI->setGPRCalleeSavedArea1Size(GPRCS1Size);
AFI->setGPRCalleeSavedArea2Size(GPRCS2Size);
@@ -828,7 +827,7 @@
AFI->getGPRCalleeSavedArea2Size() +
AFI->getDPRCalleeSavedAreaSize());
- if (hasFP(MF)) {
+ if (AFI->shouldRestoreSPFromFP()) {
NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
// Reset SP based on frame pointer only if the stack frame extends beyond
// frame pointer stack slot or target is ELF and the function has FP.