TR::Register *IA32LinkageUtils::pushLongArg(
TR::Node *child,
TR::CodeGenerator *cg)
{
TR::Register *pushRegister;
if (child->getRegister() == NULL)
{
if (child->getOpCode().isLoadConst())
{
TR_X86OpCodes pushOp;
int32_t highValue = child->getLongIntHigh();
if (highValue >= -128 && highValue <= 127)
{
pushOp = PUSHImms;
}
else
{
pushOp = PUSHImm4;
}
generateImmInstruction(pushOp, child, highValue, cg);
int32_t lowValue = child->getLongIntLow();
if (lowValue >= -128 && lowValue <= 127)
{
pushOp = PUSHImms;
}
else
{
pushOp = PUSHImm4;
}
generateImmInstruction(pushOp, child, lowValue, cg);
cg->decReferenceCount(child);
return NULL;
}
else if (child->getOpCodeValue() == TR::dbits2l &&
!child->normalizeNanValues() &&
child->getReferenceCount() == 1)
{
pushRegister = pushDoubleArg(child->getFirstChild(), cg);
cg->decReferenceCount(child);
return pushRegister;
}
else if (child->getOpCode().isMemoryReference() &&
child->getReferenceCount() == 1)
{
TR::MemoryReference *lowMR = generateX86MemoryReference(child, cg);
generateMemInstruction(PUSHMem, child, generateX86MemoryReference(*lowMR,4, cg), cg);
generateMemInstruction(PUSHMem, child, lowMR, cg);
lowMR->decNodeReferenceCounts(cg);
return NULL;
}
}
pushRegister = cg->evaluate(child);
generateRegInstruction(PUSHReg, child, pushRegister->getHighOrder(), cg);
generateRegInstruction(PUSHReg, child, pushRegister->getLowOrder(), cg);
cg->decReferenceCount(child);
return pushRegister;
}
TR::Register *IA32LinkageUtils::pushFloatArg(
TR::Node *child,
TR::CodeGenerator *cg)
{
TR::Register *pushRegister;
if (child->getRegister() == NULL)
{
if (child->getOpCodeValue() == TR::fconst)
{
int32_t value = child->getFloatBits();
TR_X86OpCodes pushOp;
if (value >= -128 && value <= 127)
{
pushOp = PUSHImms;
}
else
{
pushOp = PUSHImm4;
}
generateImmInstruction(pushOp, child, value, cg);
cg->decReferenceCount(child);
return NULL;
}
else if (child->getReferenceCount() == 1)
{
if (child->getOpCode().isLoad())
{
TR::MemoryReference *tempMR = generateX86MemoryReference(child, cg);
generateMemInstruction(PUSHMem, child, tempMR, cg);
tempMR->decNodeReferenceCounts(cg);
cg->decReferenceCount(child);
return NULL;
}
else if (child->getOpCodeValue() == TR::ibits2f)
{
pushRegister = pushIntegerWordArg(child->getFirstChild(), cg);
cg->decReferenceCount(child);
return pushRegister;
}
}
}
pushRegister = cg->evaluate(child);
TR::RealRegister *espReal = cg->machine()->getRealRegister(TR::RealRegister::esp);
generateRegImmInstruction(SUB4RegImms, child, espReal, 4, cg);
if (cg->useSSEForSinglePrecision() && pushRegister->getKind() == TR_FPR)
generateMemRegInstruction(MOVSSMemReg, child, generateX86MemoryReference(espReal, 0, cg), pushRegister, cg);
else
generateFPMemRegInstruction(FSTMemReg, child, generateX86MemoryReference(espReal, 0, cg), pushRegister, cg);
cg->decReferenceCount(child);
return pushRegister;
}
TR::Register* OMR::X86::TreeEvaluator::SIMDstoreEvaluator(TR::Node* node, TR::CodeGenerator* cg)
{
TR::Node* valueNode = node->getChild(node->getOpCode().isIndirect() ? 1 : 0);
TR::MemoryReference* tempMR = generateX86MemoryReference(node, cg);
tempMR = ConvertToPatchableMemoryReference(tempMR, node, cg);
TR::Register* valueReg = cg->evaluate(valueNode);
TR_X86OpCodes opCode = BADIA32Op;
switch (node->getSize())
{
case 16:
opCode = MOVDQUMemReg;
break;
default:
if (cg->comp()->getOption(TR_TraceCG))
traceMsg(cg->comp(), "Unsupported fill size: Node = %p\n", node);
TR_ASSERT(false, "Unsupported fill size");
break;
}
TR::Instruction* instr = generateMemRegInstruction(opCode, node, tempMR, valueReg, cg);
cg->decReferenceCount(valueNode);
tempMR->decNodeReferenceCounts(cg);
if (node->getOpCode().isIndirect())
cg->setImplicitExceptionPoint(instr);
return NULL;
}
TR::Register* OMR::X86::TreeEvaluator::SIMDloadEvaluator(TR::Node* node, TR::CodeGenerator* cg)
{
TR::MemoryReference* tempMR = generateX86MemoryReference(node, cg);
tempMR = ConvertToPatchableMemoryReference(tempMR, node, cg);
TR::Register* resultReg = cg->allocateRegister(TR_VRF);
TR_X86OpCodes opCode = BADIA32Op;
switch (node->getSize())
{
case 16:
opCode = MOVDQURegMem;
break;
default:
if (cg->comp()->getOption(TR_TraceCG))
traceMsg(cg->comp(), "Unsupported fill size: Node = %p\n", node);
TR_ASSERT(false, "Unsupported fill size");
break;
}
TR::Instruction* instr = generateRegMemInstruction(opCode, node, resultReg, tempMR, cg);
if (node->getOpCode().isIndirect())
cg->setImplicitExceptionPoint(instr);
node->setRegister(resultReg);
tempMR->decNodeReferenceCounts(cg);
return resultReg;
}
static TR::Register *l2fd(TR::Node *node, TR::RealRegister *target, TR_X86OpCodes opRegMem8, TR_X86OpCodes opRegReg8, TR::CodeGenerator *cg)
{
TR::Node *child = node->getFirstChild();
TR::MemoryReference *tempMR;
TR_ASSERT(cg->useSSEForSinglePrecision(), "assertion failure");
if (child->getRegister() == NULL &&
child->getReferenceCount() == 1 &&
child->getOpCode().isLoadVar())
{
tempMR = generateX86MemoryReference(child, cg);
generateRegMemInstruction(opRegMem8, node, target, tempMR, cg);
tempMR->decNodeReferenceCounts(cg);
}
else
{
TR::Register *intReg = cg->evaluate(child);
generateRegRegInstruction(opRegReg8, node, target, intReg, cg);
cg->decReferenceCount(child);
}
node->setRegister(target);
return target;
}
// also handles ilload
TR::Register *OMR::X86::AMD64::TreeEvaluator::lloadEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::MemoryReference *sourceMR = generateX86MemoryReference(node, cg);
TR::Register *reg = TR::TreeEvaluator::loadMemory(node, sourceMR, TR_RematerializableLong, node->getOpCode().isIndirect(), cg);
reg->setMemRef(sourceMR);
node->setRegister(reg);
sourceMR->decNodeReferenceCounts(cg);
return reg;
}
TR::Instruction *
TR_X86SystemLinkage::savePreservedRegisters(TR::Instruction *cursor)
{
// For IA32, if disableShrinkWrapping, usePushForPreservedRegs will be true; otherwise false;
// For X64, shrinkWraping is always on, and usePushForPreservedRegs always false;
// TR_ASSERT(!getProperties().getUsesPushesForPreservedRegs(), "assertion failure");
TR::ResolvedMethodSymbol *bodySymbol = comp()->getJittedMethodSymbol();
const int32_t localSize = getProperties().getOffsetToFirstLocal() - bodySymbol->getLocalMappingCursor();
const int32_t pointerSize = getProperties().getPointerSize();
int32_t offsetCursor = -localSize + getProperties().getOffsetToFirstLocal() - pointerSize;
if (_properties.getUsesPushesForPreservedRegs())
{
for (int32_t pindex = _properties.getMaxRegistersPreservedInPrologue()-1;
pindex >= 0;
pindex--)
{
TR::RealRegister::RegNum idx = _properties.getPreservedRegister((uint32_t)pindex);
TR::RealRegister *reg = machine()->getX86RealRegister(idx);
if (reg->getHasBeenAssignedInMethod() && reg->getState() != TR::RealRegister::Locked)
{
cursor = new (trHeapMemory()) TR::X86RegInstruction(cursor, PUSHReg, reg, cg());
}
}
}
else
{
TR_BitVector *p = cg()->getPreservedRegsInPrologue();
for (int32_t pindex = getProperties().getMaxRegistersPreservedInPrologue()-1;
pindex >= 0;
pindex--)
{
TR::RealRegister::RegNum idx = _properties.getPreservedRegister((uint32_t)pindex);
TR::RealRegister *reg = machine()->getX86RealRegister(getProperties().getPreservedRegister((uint32_t)pindex));
if(reg->getHasBeenAssignedInMethod() && reg->getState() != TR::RealRegister::Locked)
{
if (!p || p->get(idx))
{
cursor = generateMemRegInstruction(
cursor,
movOpcodes[MemReg][fullRegisterMovType(reg)],
generateX86MemoryReference(machine()->getX86RealRegister(TR::RealRegister::vfp), offsetCursor, cg()),
reg,
cg()
);
}
offsetCursor -= pointerSize;
}
}
}
return cursor;
}
static TR::MemoryReference* ConvertToPatchableMemoryReference(TR::MemoryReference* mr, TR::Node* node, TR::CodeGenerator* cg)
{
if (mr->getSymbolReference().isUnresolved())
{
// The load instructions may be wider than 8-bytes (our patching window)
// but we won't know that for sure until after register assignment.
// Hence, the unresolved memory reference must be evaluated into a register first.
//
TR::Register* tempReg = cg->allocateRegister();
generateRegMemInstruction(LEARegMem(cg), node, tempReg, mr, cg);
mr = generateX86MemoryReference(tempReg, 0, cg);
cg->stopUsingRegister(tempReg);
}
return mr;
}
TR::Instruction *
TR::X86SystemLinkage::savePreservedRegisters(TR::Instruction *cursor)
{
// For IA32 usePushForPreservedRegs will be true;
// For X64, usePushForPreservedRegs always false;
TR::ResolvedMethodSymbol *bodySymbol = comp()->getJittedMethodSymbol();
const int32_t localSize = getProperties().getOffsetToFirstLocal() - bodySymbol->getLocalMappingCursor();
const int32_t pointerSize = getProperties().getPointerSize();
int32_t offsetCursor = -localSize + getProperties().getOffsetToFirstLocal() - pointerSize;
if (_properties.getUsesPushesForPreservedRegs())
{
for (int32_t pindex = _properties.getMaxRegistersPreservedInPrologue()-1;
pindex >= 0;
pindex--)
{
TR::RealRegister::RegNum idx = _properties.getPreservedRegister((uint32_t)pindex);
TR::RealRegister *reg = machine()->getX86RealRegister(idx);
if (reg->getHasBeenAssignedInMethod() && reg->getState() != TR::RealRegister::Locked)
{
cursor = new (trHeapMemory()) TR::X86RegInstruction(cursor, PUSHReg, reg, cg());
}
}
}
else
{
for (int32_t pindex = getProperties().getMaxRegistersPreservedInPrologue()-1;
pindex >= 0;
pindex--)
{
TR::RealRegister::RegNum idx = _properties.getPreservedRegister((uint32_t)pindex);
TR::RealRegister *reg = machine()->getX86RealRegister(getProperties().getPreservedRegister((uint32_t)pindex));
if(reg->getHasBeenAssignedInMethod() && reg->getState() != TR::RealRegister::Locked)
{
cursor = generateMemRegInstruction(
cursor,
TR::Linkage::movOpcodes(MemReg, fullRegisterMovType(reg)),
generateX86MemoryReference(machine()->getX86RealRegister(TR::RealRegister::vfp), offsetCursor, cg()),
reg,
cg()
);
offsetCursor -= pointerSize;
}
}
}
return cursor;
}
TR::Register *TR::AMD64SystemLinkage::buildDirectDispatch(
TR::Node *callNode,
bool spillFPRegs)
{
TR::SymbolReference *methodSymRef = callNode->getSymbolReference();
TR::MethodSymbol *methodSymbol = methodSymRef->getSymbol()->castToMethodSymbol();
TR::Register *returnReg;
// Allocate adequate register dependencies.
//
// pre = number of argument registers
// post = number of volatile + return register
//
uint32_t pre = getProperties().getNumIntegerArgumentRegisters() + getProperties().getNumFloatArgumentRegisters();
uint32_t post = getProperties().getNumVolatileRegisters() + (callNode->getDataType() == TR::NoType ? 0 : 1);
#if defined (PYTHON) && 0
// Treat all preserved GP regs as volatile until register map support available.
//
post += getProperties().getNumberOfPreservedGPRegisters();
#endif
TR::RegisterDependencyConditions *preDeps = generateRegisterDependencyConditions(pre, 0, cg());
TR::RegisterDependencyConditions *postDeps = generateRegisterDependencyConditions(0, post, cg());
// Evaluate outgoing arguments on the system stack and build pre-conditions.
//
int32_t memoryArgSize = buildArgs(callNode, preDeps);
// Build post-conditions.
//
returnReg = buildVolatileAndReturnDependencies(callNode, postDeps);
postDeps->stopAddingPostConditions();
// Find the second scratch register in the post dependency list.
//
TR::Register *scratchReg = NULL;
TR::RealRegister::RegNum scratchRegIndex = getProperties().getIntegerScratchRegister(1);
for (int32_t i=0; i<post; i++)
{
if (postDeps->getPostConditions()->getRegisterDependency(i)->getRealRegister() == scratchRegIndex)
{
scratchReg = postDeps->getPostConditions()->getRegisterDependency(i)->getRegister();
break;
}
}
#if defined(PYTHON) && 0
// For Python, store the instruction that contains the GC map at this site into
// the frame object.
//
TR::SymbolReference *frameObjectSymRef =
comp()->getSymRefTab()->findOrCreateAutoSymbol(comp()->getMethodSymbol(), 0, TR::Address, true, false, true);
TR::Register *frameObjectRegister = cg()->allocateRegister();
generateRegMemInstruction(
L8RegMem,
callNode,
frameObjectRegister,
generateX86MemoryReference(frameObjectSymRef, cg()),
cg());
TR::RealRegister *espReal = cg()->machine()->getX86RealRegister(TR::RealRegister::esp);
TR::Register *gcMapPCRegister = cg()->allocateRegister();
generateRegMemInstruction(
LEA8RegMem,
callNode,
gcMapPCRegister,
generateX86MemoryReference(espReal, -8, cg()),
cg());
// Use "volatile" registers across the call. Once proper register map support
// is implemented, r14 and r15 will no longer be volatile and a different pair
// should be chosen.
//
TR::RegisterDependencyConditions *gcMapDeps = generateRegisterDependencyConditions(0, 2, cg());
gcMapDeps->addPostCondition(frameObjectRegister, TR::RealRegister::r14, cg());
gcMapDeps->addPostCondition(gcMapPCRegister, TR::RealRegister::r15, cg());
gcMapDeps->stopAddingPostConditions();
generateMemRegInstruction(
S8MemReg,
callNode,
generateX86MemoryReference(frameObjectRegister, fe()->getPythonGCMapPCOffsetInFrame(), cg()),
gcMapPCRegister,
gcMapDeps,
cg());
cg()->stopUsingRegister(frameObjectRegister);
cg()->stopUsingRegister(gcMapPCRegister);
#endif
TR::Instruction *instr;
if (methodSymbol->getMethodAddress())
{
TR_ASSERT(scratchReg, "could not find second scratch register");
auto LoadRegisterInstruction = generateRegImm64SymInstruction(
MOV8RegImm64,
callNode,
scratchReg,
(uintptr_t)methodSymbol->getMethodAddress(),
methodSymRef,
cg());
if (TR::Options::getCmdLineOptions()->getOption(TR_EmitRelocatableELFFile))
{
LoadRegisterInstruction->setReloKind(TR_NativeMethodAbsolute);
}
instr = generateRegInstruction(CALLReg, callNode, scratchReg, preDeps, cg());
}
else
{
instr = generateImmSymInstruction(CALLImm4, callNode, (uintptrj_t)methodSymbol->getMethodAddress(), methodSymRef, preDeps, cg());
}
cg()->resetIsLeafMethod();
instr->setNeedsGCMap(getProperties().getPreservedRegisterMapForGC());
cg()->stopUsingRegister(scratchReg);
TR::LabelSymbol *postDepLabel = generateLabelSymbol(cg());
generateLabelInstruction(LABEL, callNode, postDepLabel, postDeps, cg());
return returnReg;
}
// Build arguments for system linkage dispatch.
//
int32_t TR::AMD64SystemLinkage::buildArgs(
TR::Node *callNode,
TR::RegisterDependencyConditions *deps)
{
TR::SymbolReference *methodSymRef = callNode->getSymbolReference();
TR::MethodSymbol *methodSymbol = methodSymRef->getSymbol()->castToMethodSymbol();
TR::RealRegister::RegNum noReg = TR::RealRegister::NoReg;
TR::RealRegister *espReal = machine()->getX86RealRegister(TR::RealRegister::esp);
int32_t firstNodeArgument = callNode->getFirstArgumentIndex();
int32_t lastNodeArgument = callNode->getNumChildren() - 1;
int32_t offset = 0;
int32_t sizeOfOutGoingArgs= 0;
uint16_t numIntArgs = 0,
numFloatArgs = 0;
int32_t first, last, direction;
int32_t numCopiedRegs = 0;
TR::Register *copiedRegs[TR::X86LinkageProperties::MaxArgumentRegisters];
if (getProperties().passArgsRightToLeft())
{
first = lastNodeArgument;
last = firstNodeArgument - 1;
direction = -1;
}
else
{
first = firstNodeArgument;
last = lastNodeArgument + 1;
direction = 1;
}
// If the dispatch is indirect we must add the VFT register to the preconditions
// so that it gets register assigned with the other preconditions to the call.
//
if (callNode->getOpCode().isIndirect())
{
TR::Node *vftChild = callNode->getFirstChild();
TR_ASSERT(vftChild->getRegister(), "expecting VFT child to be evaluated");
TR::RealRegister::RegNum scratchRegIndex = getProperties().getIntegerScratchRegister(1);
deps->addPreCondition(vftChild->getRegister(), scratchRegIndex, cg());
}
int32_t i;
for (i = first; i != last; i += direction)
{
TR::parmLayoutResult layoutResult;
TR::RealRegister::RegNum rregIndex = noReg;
TR::Node *child = callNode->getChild(i);
layoutParm(child, sizeOfOutGoingArgs, numIntArgs, numFloatArgs, layoutResult);
if (layoutResult.abstract & TR::parmLayoutResult::IN_LINKAGE_REG_PAIR)
{
// TODO: AMD64 SysV ABI might put a struct into a pair of linkage registerr
TR_ASSERT(false, "haven't support linkage_reg_pair yet.\n");
}
else if (layoutResult.abstract & TR::parmLayoutResult::IN_LINKAGE_REG)
{
TR_RegisterKinds regKind = layoutResult.regs[0].regKind;
uint32_t regIndex = layoutResult.regs[0].regIndex;
TR_ASSERT(regKind == TR_GPR || regKind == TR_FPR, "linkage registers includes TR_GPR and TR_FPR\n");
rregIndex = (regKind == TR_FPR) ? getProperties().getFloatArgumentRegister(regIndex): getProperties().getIntegerArgumentRegister(regIndex);
}
else
{
offset = layoutResult.offset;
}
TR::Register *vreg;
vreg = cg()->evaluate(child);
bool needsStackOffsetUpdate = false;
if (rregIndex != noReg)
{
// For NULL JNI reference parameters, it is possible that the NULL value will be evaluated into
// a different register than the child. In that case it is not necessary to copy the temporary scratch
// register across the call.
//
if ((child->getReferenceCount() > 1) &&
(vreg == child->getRegister()))
{
TR::Register *argReg = cg()->allocateRegister();
if (vreg->containsCollectedReference())
argReg->setContainsCollectedReference();
generateRegRegInstruction(TR::Linkage::movOpcodes(RegReg, movType(child->getDataType())), child, argReg, vreg, cg());
vreg = argReg;
copiedRegs[numCopiedRegs++] = vreg;
}
deps->addPreCondition(vreg, rregIndex, cg());
}
else
{
// Ideally, we would like to push rather than move
generateMemRegInstruction(TR::Linkage::movOpcodes(MemReg, fullRegisterMovType(vreg)),
child,
generateX86MemoryReference(espReal, offset, cg()),
vreg,
cg());
}
cg()->decReferenceCount(child);
}
// Now that we're finished making the preconditions, all the interferences
// are established and we can kill these regs.
//
for (i = 0; i < numCopiedRegs; i++)
cg()->stopUsingRegister(copiedRegs[i]);
deps->stopAddingPreConditions();
return sizeOfOutGoingArgs;
}
// Copies parameters from where they enter the method (either on stack or in a
// linkage register) to their "home location" where the method body will expect
// to find them (either on stack or in a global register).
//
TR::Instruction *
TR::X86SystemLinkage::copyParametersToHomeLocation(TR::Instruction *cursor)
{
TR::Machine *machine = cg()->machine();
TR::RealRegister *framePointer = machine->getX86RealRegister(TR::RealRegister::vfp);
TR::ResolvedMethodSymbol *bodySymbol = comp()->getJittedMethodSymbol();
ListIterator<TR::ParameterSymbol> paramIterator(&(bodySymbol->getParameterList()));
TR::ParameterSymbol *paramCursor;
const TR::RealRegister::RegNum noReg = TR::RealRegister::NoReg;
TR_ASSERT(noReg == 0, "noReg must be zero so zero-initializing movStatus will work");
TR::MovStatus movStatus[TR::RealRegister::NumRegisters] = {{(TR::RealRegister::RegNum)0,(TR::RealRegister::RegNum)0,(TR_MovDataTypes)0}};
// We must always do the stores first, then the reg-reg copies, then the
// loads, so that we never clobber a register we will need later. However,
// the logic is simpler if we do the loads and stores in the same loop.
// Therefore, we maintain a separate instruction cursor for the loads.
//
// We defer the initialization of loadCursor until we generate the first
// load. Otherwise, if we happen to generate some stores first, then the
// store cursor would get ahead of the loadCursor, and the instructions
// would end up in the wrong order despite our efforts.
//
TR::Instruction *loadCursor = NULL;
// Phase 1: generate RegMem and MemReg movs, and collect information about
// the required RegReg movs.
//
for (paramCursor = paramIterator.getFirst();
paramCursor != NULL;
paramCursor = paramIterator.getNext())
{
int8_t lri = paramCursor->getLinkageRegisterIndex(); // How the parameter enters the method
TR::RealRegister::RegNum ai // Where method body expects to find it
= (TR::RealRegister::RegNum)paramCursor->getAllocatedIndex();
int32_t offset = paramCursor->getParameterOffset(); // Location of the parameter's stack slot
TR_MovDataTypes movDataType = paramMovType(paramCursor); // What sort of MOV instruction does it need?
// Copy the parameter to wherever it should be
//
if (lri == NOT_LINKAGE) // It's on the stack
{
if (ai == NOT_ASSIGNED) // It only needs to be on the stack
{
// Nothing to do
}
else // Method body expects it to be in the ai register
{
if (loadCursor == NULL)
loadCursor = cursor;
if (debug("traceCopyParametersToHomeLocation"))
diagnostic("copyParametersToHomeLocation: Loading %d\n", ai);
// ai := stack
loadCursor = generateRegMemInstruction(
loadCursor,
TR::Linkage::movOpcodes(RegMem, movDataType),
machine->getX86RealRegister(ai),
generateX86MemoryReference(framePointer, offset, cg()),
cg()
);
}
}
else // It's in a linkage register
{
TR::RealRegister::RegNum sourceIndex = getProperties().getArgumentRegister(lri, isFloat(movDataType));
// Copy to the stack if necessary
//
if (ai == NOT_ASSIGNED || hasToBeOnStack(paramCursor))
{
if (comp()->getOption(TR_TraceCG))
traceMsg(comp(), "copyToHomeLocation param %p, linkage reg index %d, allocated index %d, parameter offset %d, hasToBeOnStack %d, parm->isParmHasToBeOnStack() %d.\n", paramCursor, lri, ai, offset, hasToBeOnStack(paramCursor), paramCursor->isParmHasToBeOnStack());
if (debug("traceCopyParametersToHomeLocation"))
diagnostic("copyParametersToHomeLocation: Storing %d\n", sourceIndex);
// stack := lri
cursor = generateMemRegInstruction(
cursor,
TR::Linkage::movOpcodes(MemReg, movDataType),
generateX86MemoryReference(framePointer, offset, cg()),
machine->getX86RealRegister(sourceIndex),
cg()
);
}
// Copy to the ai register if necessary
//
if (ai != NOT_ASSIGNED && ai != sourceIndex)
{
// This parameter needs a RegReg move. We don't know yet whether
// we need the value in the target register, so for now we just
// remember that we need to do this and keep going.
//
TR_ASSERT(movStatus[ai ].sourceReg == noReg, "Each target reg must have only one source");
TR_ASSERT(movStatus[sourceIndex].targetReg == noReg, "Each source reg must have only one target");
if (debug("traceCopyParametersToHomeLocation"))
diagnostic("copyParametersToHomeLocation: Planning to move %d to %d\n", sourceIndex, ai);
movStatus[ai].sourceReg = sourceIndex;
movStatus[sourceIndex].targetReg = ai;
movStatus[sourceIndex].outgoingDataType = movDataType;
}
if (debug("traceCopyParametersToHomeLocation") && ai == sourceIndex)
{
diagnostic("copyParametersToHomeLocation: Parameter #%d already in register %d\n", lri, ai);
}
}
}
// Phase 2: Iterate through the parameters again to insert the RegReg moves.
//
for (paramCursor = paramIterator.getFirst();
paramCursor != NULL;
paramCursor = paramIterator.getNext())
{
if (paramCursor->getLinkageRegisterIndex() == NOT_LINKAGE)
continue;
const TR::RealRegister::RegNum paramReg =
getProperties().getArgumentRegister(paramCursor->getLinkageRegisterIndex(), isFloat(paramMovType(paramCursor)));
if (movStatus[paramReg].targetReg == 0)
{
// This parameter does not need to be copied anywhere
if (debug("traceCopyParametersToHomeLocation"))
diagnostic("copyParametersToHomeLocation: Not moving %d\n", paramReg);
}
else
{
if (debug("traceCopyParametersToHomeLocation"))
diagnostic("copyParametersToHomeLocation: Preparing to move %d\n", paramReg);
// If a mov's target register is the source for another mov, we need
// to do that other mov first. The idea is to find the end point of
// the chain of movs starting with paramReg and ending with a
// register whose current value is not needed; then do that chain of
// movs in reverse order.
//
TR_ASSERT(noReg == 0, "noReg must be zero (not %d) for zero-filled initialization to work", noReg);
TR::RealRegister::RegNum regCursor;
// Find the last target in the chain
//
regCursor = movStatus[paramReg].targetReg;
while(movStatus[regCursor].targetReg != noReg)
{
// Haven't found the end yet
regCursor = movStatus[regCursor].targetReg;
TR_ASSERT(regCursor != paramReg, "Can't yet handle cyclic dependencies");
// TODO:AMD64 Use scratch register to break cycles
// A properly-written pickRegister should never
// cause cycles to occur in the first place. However, we may want
// to consider adding cycle-breaking logic so that (1) pickRegister
// has more flexibility, and (2) we're more robust against
// otherwise harmless bugs in pickRegister.
}
// Work our way backward along the chain, generating all the necessary movs
//
while(movStatus[regCursor].sourceReg != noReg)
{
TR::RealRegister::RegNum source = movStatus[regCursor].sourceReg;
if (debug("traceCopyParametersToHomeLocation"))
diagnostic("copyParametersToHomeLocation: Moving %d to %d\n", source, regCursor);
// regCursor := regCursor.sourceReg
cursor = generateRegRegInstruction(
cursor,
TR::Linkage::movOpcodes(RegReg, movStatus[source].outgoingDataType),
machine->getX86RealRegister(regCursor),
machine->getX86RealRegister(source),
cg()
);
// Update movStatus as we go so we don't generate redundant movs
movStatus[regCursor].sourceReg = noReg;
movStatus[source ].targetReg = noReg;
// Continue with the next register in the chain
regCursor = source;
}
}
}
// Return the last instruction we inserted, whether or not it was a load.
//
return loadCursor? loadCursor : cursor;
}
/*
* users should call the longSubtractAnalyser or longSubtractAnalyserWithExplicitOperands APIs instead of calling this one directly
*/
TR::Register* TR_X86SubtractAnalyser::longSubtractAnalyserImpl(TR::Node *root, TR::Node *&firstChild, TR::Node *&secondChild)
{
TR::Register *firstRegister = firstChild->getRegister();
TR::Register *secondRegister = secondChild->getRegister();
TR::Register *targetRegister = NULL;
bool firstHighZero = false;
bool secondHighZero = false; bool useSecondHighOrder = false;
TR_X86OpCodes regRegOpCode = SUB4RegReg;
TR_X86OpCodes regMemOpCode = SUB4RegMem;
bool needsEflags = NEED_CC(root) || (root->getOpCodeValue() == TR::lusubb);
// Can generate better code for long adds when one or more children have a high order zero word
// can avoid the evaluation when we don't need the result of such nodes for another parent.
//
if (firstChild->isHighWordZero() && !needsEflags)
{
firstHighZero = true;
}
if (secondChild->isHighWordZero() && !needsEflags)
{
secondHighZero = true;
TR::ILOpCodes secondOp = secondChild->getOpCodeValue();
if (secondChild->getReferenceCount() == 1 && secondRegister == 0)
{
if (secondOp == TR::iu2l || secondOp == TR::su2l ||
secondOp == TR::bu2l ||
(secondOp == TR::lushr &&
secondChild->getSecondChild()->getOpCodeValue() == TR::iconst &&
(secondChild->getSecondChild()->getInt() & TR::TreeEvaluator::shiftMask(true)) == 32))
{
secondChild = secondChild->getFirstChild();
secondRegister = secondChild->getRegister();
if (secondOp == TR::lushr)
{
useSecondHighOrder = true;
}
}
}
}
setInputs(firstChild, firstRegister, secondChild, secondRegister);
if (isVolatileMemoryOperand(firstChild))
resetMem1();
if (isVolatileMemoryOperand(secondChild))
resetMem2();
if (getEvalChild1())
{
firstRegister = _cg->evaluate(firstChild);
}
if (getEvalChild2())
{
secondRegister = _cg->evaluate(secondChild);
}
if (secondHighZero && secondRegister && secondRegister->getRegisterPair())
{
if (!useSecondHighOrder)
{
secondRegister = secondRegister->getLowOrder();
}
else
{
secondRegister = secondRegister->getHighOrder();
}
}
if (root->getOpCodeValue() == TR::lusubb &&
TR_X86ComputeCC::setCarryBorrow(root->getChild(2), true, _cg))
{
// use SBB rather than SUB
//
regRegOpCode = SBB4RegReg;
regMemOpCode = SBB4RegMem;
}
if (getCopyReg1())
{
TR::Register *lowThird = _cg->allocateRegister();
TR::Register *highThird = _cg->allocateRegister();
TR::RegisterPair *thirdReg = _cg->allocateRegisterPair(lowThird, highThird);
targetRegister = thirdReg;
generateRegRegInstruction(MOV4RegReg, root, lowThird, firstRegister->getLowOrder(), _cg);
if (firstHighZero)
{
generateRegRegInstruction(XOR4RegReg, root, highThird, highThird, _cg);
}
else
{
generateRegRegInstruction(MOV4RegReg, root, highThird, firstRegister->getHighOrder(), _cg);
}
if (getSubReg3Reg2())
{
if (secondHighZero)
{
generateRegRegInstruction(regRegOpCode, root, lowThird, secondRegister, _cg);
generateRegImmInstruction(SBB4RegImms, root, highThird, 0, _cg);
}
else
{
generateRegRegInstruction(regRegOpCode, root, lowThird, secondRegister->getLowOrder(), _cg);
generateRegRegInstruction(SBB4RegReg, root, highThird, secondRegister->getHighOrder(), _cg);
}
}
else // assert getSubReg3Mem2() == true
{
TR::MemoryReference *lowMR = generateX86MemoryReference(secondChild, _cg);
/**
* The below code is needed to ensure correct behaviour when the subtract analyser encounters a lushr bytecode that shifts
* by 32 bits. This is the only case where the useSecondHighOrder bit is set.
* When the first child of the lushr is in a register, code above handles the shift. When the first child of the lushr is in
* memory, the below ensures that the upper part of the first child of the lushr is used as lowMR.
*/
if (useSecondHighOrder)
{
TR_ASSERT(secondHighZero, "useSecondHighOrder should be consistent with secondHighZero. useSecondHighOrder subsumes secondHighZero");
lowMR = generateX86MemoryReference(*lowMR, 4, _cg);
}
generateRegMemInstruction(regMemOpCode, root, lowThird, lowMR, _cg);
if (secondHighZero)
{
generateRegImmInstruction(SBB4RegImms, root, highThird, 0, _cg);
}
else
{
TR::MemoryReference *highMR = generateX86MemoryReference(*lowMR, 4, _cg);
generateRegMemInstruction(SBB4RegMem, root, highThird, highMR, _cg);
}
lowMR->decNodeReferenceCounts(_cg);
}
}
else if (getSubReg1Reg2())
{
if (secondHighZero)
{
generateRegRegInstruction(regRegOpCode, root, firstRegister->getLowOrder(), secondRegister, _cg);
generateRegImmInstruction(SBB4RegImms, root, firstRegister->getHighOrder(), 0, _cg);
}
else
{
generateRegRegInstruction(regRegOpCode, root, firstRegister->getLowOrder(), secondRegister->getLowOrder(), _cg);
generateRegRegInstruction(SBB4RegReg, root, firstRegister->getHighOrder(), secondRegister->getHighOrder(), _cg);
}
targetRegister = firstRegister;
}
else // assert getSubReg1Mem2() == true
{
TR::MemoryReference *lowMR = generateX86MemoryReference(secondChild, _cg);
/**
* The below code is needed to ensure correct behaviour when the subtract analyser encounters a lushr bytecode that shifts
* by 32 bits. This is the only case where the useSecondHighOrder bit is set.
* When the first child of the lushr is in a register, code above handles the shift. When the first child of the lushr is in
* memory, the below ensures that the upper part of the first child of the lushr is used as lowMR.
*/
if (useSecondHighOrder)
lowMR = generateX86MemoryReference(*lowMR, 4, _cg);
generateRegMemInstruction(regMemOpCode, root, firstRegister->getLowOrder(), lowMR, _cg);
if (secondHighZero)
{
generateRegImmInstruction(SBB4RegImms, root, firstRegister->getHighOrder(), 0, _cg);
}
else
{
TR::MemoryReference *highMR = generateX86MemoryReference(*lowMR, 4, _cg);
generateRegMemInstruction(SBB4RegMem, root, firstRegister->getHighOrder(), highMR, _cg);
}
targetRegister = firstRegister;
lowMR->decNodeReferenceCounts(_cg);
}
return targetRegister;
}
TR::Register *IA32LinkageUtils::pushIntegerWordArg(
TR::Node *child,
TR::CodeGenerator *cg)
{
TR::Register *pushRegister;
if (child->getRegister() == NULL)
{
if (child->getOpCode().isLoadConst())
{
int32_t value = child->getInt();
TR_X86OpCodes pushOp;
if (value >= -128 && value <= 127)
{
pushOp = PUSHImms;
}
else
{
pushOp = PUSHImm4;
}
generateImmInstruction(pushOp, child, value, cg);
cg->decReferenceCount(child);
return NULL;
}
else if (child->getOpCodeValue() == TR::loadaddr)
{
TR::SymbolReference * symRef = child->getSymbolReference();
TR::StaticSymbol *sym = symRef->getSymbol()->getStaticSymbol();
if (sym)
{
TR_ASSERT(!symRef->isUnresolved(), "pushIntegerWordArg loadaddr expecting resolved symbol");
generateImmSymInstruction(PUSHImm4, child, (uintptrj_t)sym->getStaticAddress(), symRef, cg);
cg->decReferenceCount(child);
return NULL;
}
}
else if (child->getOpCodeValue() == TR::fbits2i &&
!child->normalizeNanValues() &&
child->getReferenceCount() == 1)
{
pushRegister = pushFloatArg(child->getFirstChild(), cg);
cg->decReferenceCount(child);
return pushRegister;
}
else if (child->getOpCode().isMemoryReference() &&
(child->getReferenceCount() == 1) &&
(child->getSymbolReference() != cg->comp()->getSymRefTab()->findVftSymbolRef()))
{
TR::MemoryReference *tempMR = generateX86MemoryReference(child, cg);
generateMemInstruction(PUSHMem, child, tempMR, cg);
tempMR->decNodeReferenceCounts(cg);
cg->decReferenceCount(child);
return NULL;
}
}
pushRegister = cg->evaluate(child);
generateRegInstruction(PUSHReg, child, pushRegister, cg);
cg->decReferenceCount(child);
return pushRegister;
}
TR::Register *IA32LinkageUtils::pushDoubleArg(
TR::Node *child,
TR::CodeGenerator *cg)
{
TR::Register *pushRegister;
if (child->getRegister() == NULL)
{
if (child->getOpCodeValue() == TR::dconst)
{
TR_X86OpCodes pushOp;
int32_t highValue = child->getLongIntHigh();
if (highValue >= -128 && highValue <= 127)
{
pushOp = PUSHImms;
}
else
{
pushOp = PUSHImm4;
}
generateImmInstruction(pushOp, child, highValue, cg);
int32_t lowValue = child->getLongIntLow();
if (lowValue >= -128 && lowValue <= 127)
{
pushOp = PUSHImms;
}
else
{
pushOp = PUSHImm4;
}
generateImmInstruction(pushOp, child, lowValue, cg);
cg->decReferenceCount(child);
return NULL;
}
else if (child->getReferenceCount() == 1)
{
if (child->getOpCode().isLoad())
{
TR::MemoryReference *lowMR = generateX86MemoryReference(child, cg);
generateMemInstruction(PUSHMem, child, generateX86MemoryReference(*lowMR, 4, cg), cg);
generateMemInstruction(PUSHMem, child, lowMR, cg);
lowMR->decNodeReferenceCounts(cg);
cg->decReferenceCount(child);
return NULL;
}
else if (child->getOpCodeValue() == TR::lbits2d)
{
pushRegister = pushLongArg(child->getFirstChild(), cg);
cg->decReferenceCount(child);
return pushRegister;
}
}
}
pushRegister = cg->evaluate(child);
TR::RealRegister *espReal = cg->machine()->getRealRegister(TR::RealRegister::esp);
generateRegImmInstruction(SUB4RegImms, child, espReal, 8, cg);
if (cg->useSSEForSinglePrecision() && pushRegister->getKind() == TR_FPR)
generateMemRegInstruction(MOVSDMemReg, child, generateX86MemoryReference(espReal, 0, cg), pushRegister, cg);
else
generateFPMemRegInstruction(DSTMemReg, child, generateX86MemoryReference(espReal, 0, cg), pushRegister, cg);
cg->decReferenceCount(child);
return pushRegister;
}
TR::Register *TR_IA32XMMCompareAnalyser::xmmCompareAnalyser(TR::Node *root,
TR_X86OpCodes cmpRegRegOpCode,
TR_X86OpCodes cmpRegMemOpCode)
{
TR::Node *firstChild,
*secondChild;
TR::ILOpCodes cmpOp = root->getOpCodeValue();
bool reverseMemOp = false;
bool reverseCmpOp = false;
// Some operators must have their operands swapped to improve the generated
// code needed to evaluate the result of the comparison.
//
bool mustSwapOperands = (cmpOp == TR::iffcmple ||
cmpOp == TR::ifdcmple ||
cmpOp == TR::iffcmpgtu ||
cmpOp == TR::ifdcmpgtu ||
cmpOp == TR::fcmple ||
cmpOp == TR::dcmple ||
cmpOp == TR::fcmpgtu ||
cmpOp == TR::dcmpgtu ||
cmpOp == TR::iffcmplt ||
cmpOp == TR::ifdcmplt ||
cmpOp == TR::iffcmpgeu ||
cmpOp == TR::ifdcmpgeu ||
cmpOp == TR::fcmplt ||
cmpOp == TR::dcmplt ||
cmpOp == TR::fcmpgeu ||
cmpOp == TR::dcmpgeu) ? true : false;
// Some operators should not have their operands swapped to improve the generated
// code needed to evaluate the result of the comparison.
//
bool preventOperandSwapping = (cmpOp == TR::iffcmpltu ||
cmpOp == TR::ifdcmpltu ||
cmpOp == TR::iffcmpge ||
cmpOp == TR::ifdcmpge ||
cmpOp == TR::fcmpltu ||
cmpOp == TR::dcmpltu ||
cmpOp == TR::fcmpge ||
cmpOp == TR::dcmpge ||
cmpOp == TR::iffcmpgt ||
cmpOp == TR::ifdcmpgt ||
cmpOp == TR::iffcmpleu ||
cmpOp == TR::ifdcmpleu ||
cmpOp == TR::fcmpgt ||
cmpOp == TR::dcmpgt ||
cmpOp == TR::fcmpleu ||
cmpOp == TR::dcmpleu) ? true : false;
// For correctness, don't swap operands of these operators.
//
if (cmpOp == TR::fcmpg || cmpOp == TR::fcmpl ||
cmpOp == TR::dcmpg || cmpOp == TR::dcmpl)
{
preventOperandSwapping = true;
}
// Initial operand evaluation ordering.
//
if (preventOperandSwapping || (!mustSwapOperands && _cg->whichChildToEvaluate(root) == 0))
{
firstChild = root->getFirstChild();
secondChild = root->getSecondChild();
setReversedOperands(false);
}
else
{
firstChild = root->getSecondChild();
secondChild = root->getFirstChild();
setReversedOperands(true);
}
TR::Register *firstRegister = firstChild->getRegister();
TR::Register *secondRegister = secondChild->getRegister();
setInputs(firstChild,
firstRegister,
secondChild,
secondRegister,
false,
// If either 'preventOperandSwapping' or 'mustSwapOperands' is set then the
// initial operand ordering set above must be maintained.
//
preventOperandSwapping || mustSwapOperands);
// Make sure any required operand ordering is respected.
//
if ((getCmpReg2Reg1() || getCmpReg2Mem1()) &&
(mustSwapOperands || preventOperandSwapping))
{
reverseCmpOp = getCmpReg2Reg1() ? true : false;
reverseMemOp = getCmpReg2Mem1() ? true : false;
}
// Evaluate the children if necessary.
//
if (getEvalChild1())
{
_cg->evaluate(firstChild);
}
if (getEvalChild2())
{
_cg->evaluate(secondChild);
}
TR::TreeEvaluator::coerceFPOperandsToXMMRs(root, _cg);
firstRegister = firstChild->getRegister();
secondRegister = secondChild->getRegister();
// Generate the compare instruction.
//
if (getCmpReg1Mem2() || reverseMemOp)
{
TR::MemoryReference *tempMR = generateX86MemoryReference(secondChild, _cg);
generateRegMemInstruction(cmpRegMemOpCode, root, firstRegister, tempMR, _cg);
tempMR->decNodeReferenceCounts(_cg);
}
else if (getCmpReg2Mem1())
{
TR::MemoryReference *tempMR = generateX86MemoryReference(firstChild, _cg);
generateRegMemInstruction(cmpRegMemOpCode, root, secondRegister, tempMR, _cg);
notReversedOperands();
tempMR->decNodeReferenceCounts(_cg);
}
else if (getCmpReg1Reg2() || reverseCmpOp)
{
generateRegRegInstruction(cmpRegRegOpCode, root, firstRegister, secondRegister, _cg);
}
else if (getCmpReg2Reg1())
{
generateRegRegInstruction(cmpRegRegOpCode, root, secondRegister, firstRegister, _cg);
notReversedOperands();
}
_cg->decReferenceCount(firstChild);
_cg->decReferenceCount(secondChild);
// Update the opcode on the root node if we have swapped its children.
// TODO: Reverse the children too, or else this looks wrong in the log file
//
if (getReversedOperands())
{
cmpOp = TR::ILOpCode(cmpOp).getOpCodeForSwapChildren();
TR::Node::recreate(root, cmpOp);
}
return NULL;
}
TR::Register *OMR::X86::AMD64::TreeEvaluator::dbits2lEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
// TODO:AMD64: Peepholing
TR::Node *child = node->getFirstChild();
TR::Register *sreg = cg->evaluate(child);
TR::Register *treg = cg->allocateRegister(TR_GPR);
generateRegRegInstruction(MOVQReg8Reg, node, treg, sreg, cg);
if (node->normalizeNanValues())
{
static char *disableFastNormalizeNaNs = feGetEnv("TR_disableFastNormalizeNaNs");
if (disableFastNormalizeNaNs)
{
// This one is not clever, but it is simple, and it's based directly
// on the IA32 version which is known to work, so is safer.
//
TR::RegisterDependencyConditions *deps = generateRegisterDependencyConditions((uint8_t)0, (uint8_t)1, cg);
deps->addPostCondition(treg, TR::RealRegister::NoReg, cg);
TR::IA32ConstantDataSnippet *nan1Snippet = cg->findOrCreate8ByteConstant(node, DOUBLE_NAN_1_LOW);
TR::IA32ConstantDataSnippet *nan2Snippet = cg->findOrCreate8ByteConstant(node, DOUBLE_NAN_2_LOW);
TR::MemoryReference *nan1MR = generateX86MemoryReference(nan1Snippet, cg);
TR::MemoryReference *nan2MR = generateX86MemoryReference(nan2Snippet, cg);
TR::LabelSymbol *startLabel = TR::LabelSymbol::create(cg->trHeapMemory(),cg);
TR::LabelSymbol *normalizeLabel = TR::LabelSymbol::create(cg->trHeapMemory(),cg);
TR::LabelSymbol *endLabel = TR::LabelSymbol::create(cg->trHeapMemory(),cg);
startLabel->setStartInternalControlFlow();
endLabel ->setEndInternalControlFlow();
generateLabelInstruction( LABEL, node, startLabel, cg);
generateRegMemInstruction( CMP8RegMem, node, treg, nan1MR, cg);
generateLabelInstruction( JGE4, node, normalizeLabel, cg);
generateRegMemInstruction( CMP8RegMem, node, treg, nan2MR, cg);
generateLabelInstruction( JB4, node, endLabel, cg);
generateLabelInstruction( LABEL, node, normalizeLabel, cg);
generateRegImm64Instruction( MOV8RegImm64, node, treg, DOUBLE_NAN, cg);
generateLabelInstruction( LABEL, node, endLabel, deps, cg);
}
else
{
// A bunch of bookkeeping
//
uint64_t nanDetector = DOUBLE_NAN_2_LOW;
TR::RegisterDependencyConditions *internalControlFlowDeps = generateRegisterDependencyConditions((uint8_t)0, (uint8_t)1, cg);
internalControlFlowDeps->addPostCondition(treg, TR::RealRegister::NoReg, cg);
TR::RegisterDependencyConditions *helperDeps = generateRegisterDependencyConditions((uint8_t)1, (uint8_t)1, cg);
helperDeps->addPreCondition( treg, TR::RealRegister::eax, cg);
helperDeps->addPostCondition(treg, TR::RealRegister::eax, cg);
TR::IA32ConstantDataSnippet *nanDetectorSnippet = cg->findOrCreate8ByteConstant(node, nanDetector);
TR::MemoryReference *nanDetectorMR = generateX86MemoryReference(nanDetectorSnippet, cg);
TR::LabelSymbol *startLabel = TR::LabelSymbol::create(cg->trHeapMemory(),cg);
TR::LabelSymbol *slowPathLabel = TR::LabelSymbol::create(cg->trHeapMemory(),cg);
TR::LabelSymbol *normalizeLabel = TR::LabelSymbol::create(cg->trHeapMemory(),cg);
TR::LabelSymbol *endLabel = TR::LabelSymbol::create(cg->trHeapMemory(),cg);
startLabel->setStartInternalControlFlow();
endLabel ->setEndInternalControlFlow();
// Fast path: if subtracting nanDetector leaves CF=0 or OF=1, then it
// must be a NaN.
//
generateLabelInstruction( LABEL, node, startLabel, cg);
generateRegMemInstruction( CMP8RegMem, node, treg, nanDetectorMR, cg);
generateLabelInstruction( JAE4, node, slowPathLabel, cg);
generateLabelInstruction( JO4, node, slowPathLabel, cg);
// Slow path
//
TR_OutlinedInstructions *slowPath = new (cg->trHeapMemory()) TR_OutlinedInstructions(slowPathLabel, cg);
cg->getOutlinedInstructionsList().push_front(slowPath);
slowPath->swapInstructionListsWithCompilation();
generateLabelInstruction(NULL, LABEL, slowPathLabel, cg)->setNode(node);
generateRegImm64Instruction(MOV8RegImm64, node, treg, DOUBLE_NAN, cg);
generateLabelInstruction( JMP4, node, endLabel, cg);
slowPath->swapInstructionListsWithCompilation();
// Merge point
//
generateLabelInstruction(LABEL, node, endLabel, internalControlFlowDeps, cg);
}
}
node->setRegister(treg);
cg->decReferenceCount(child);
return treg;
}
TR::Register *TR_X86FPCompareAnalyser::fpCompareAnalyser(TR::Node *root,
TR_X86OpCodes cmpRegRegOpCode,
TR_X86OpCodes cmpRegMemOpCode,
TR_X86OpCodes cmpiRegRegOpCode,
bool useFCOMIInstructions)
{
TR::Node *firstChild,
*secondChild;
TR::ILOpCodes cmpOp = root->getOpCodeValue();
bool reverseMemOp = false;
bool reverseCmpOp = false;
TR::Compilation* comp = _cg->comp();
TR_X86OpCodes cmpInstr = useFCOMIInstructions ? cmpiRegRegOpCode : cmpRegRegOpCode;
// Some operators must have their operands swapped to improve the generated
// code needed to evaluate the result of the comparison.
//
bool mustSwapOperands = (cmpOp == TR::iffcmple ||
cmpOp == TR::ifdcmple ||
cmpOp == TR::iffcmpgtu ||
cmpOp == TR::ifdcmpgtu ||
cmpOp == TR::fcmple ||
cmpOp == TR::dcmple ||
cmpOp == TR::fcmpgtu ||
cmpOp == TR::dcmpgtu ||
(useFCOMIInstructions &&
(cmpOp == TR::iffcmplt ||
cmpOp == TR::ifdcmplt ||
cmpOp == TR::iffcmpgeu ||
cmpOp == TR::ifdcmpgeu ||
cmpOp == TR::fcmplt ||
cmpOp == TR::dcmplt ||
cmpOp == TR::fcmpgeu ||
cmpOp == TR::dcmpgeu))) ? true : false;
// Some operators should not have their operands swapped to improve the generated
// code needed to evaluate the result of the comparison.
//
bool preventOperandSwapping = (cmpOp == TR::iffcmpltu ||
cmpOp == TR::ifdcmpltu ||
cmpOp == TR::iffcmpge ||
cmpOp == TR::ifdcmpge ||
cmpOp == TR::fcmpltu ||
cmpOp == TR::dcmpltu ||
cmpOp == TR::fcmpge ||
cmpOp == TR::dcmpge ||
(useFCOMIInstructions &&
(cmpOp == TR::iffcmpgt ||
cmpOp == TR::ifdcmpgt ||
cmpOp == TR::iffcmpleu ||
cmpOp == TR::ifdcmpleu ||
cmpOp == TR::fcmpgt ||
cmpOp == TR::dcmpgt ||
cmpOp == TR::fcmpleu ||
cmpOp == TR::dcmpleu))) ? true : false;
// For correctness, don't swap operands of these operators.
//
if (cmpOp == TR::fcmpg || cmpOp == TR::fcmpl ||
cmpOp == TR::dcmpg || cmpOp == TR::dcmpl)
{
preventOperandSwapping = true;
}
// Initial operand evaluation ordering.
//
if (preventOperandSwapping || (!mustSwapOperands && _cg->whichChildToEvaluate(root) == 0))
{
firstChild = root->getFirstChild();
secondChild = root->getSecondChild();
setReversedOperands(false);
}
else
{
firstChild = root->getSecondChild();
secondChild = root->getFirstChild();
setReversedOperands(true);
}
TR::Register *firstRegister = firstChild->getRegister();
TR::Register *secondRegister = secondChild->getRegister();
setInputs(firstChild,
firstRegister,
secondChild,
secondRegister,
useFCOMIInstructions,
// If either 'preventOperandSwapping' or 'mustSwapOperands' is set then the
// initial operand ordering set above must be maintained.
//
preventOperandSwapping || mustSwapOperands);
// Make sure any required operand ordering is respected.
//
if ((getCmpReg2Reg1() || getCmpReg2Mem1()) &&
(mustSwapOperands || preventOperandSwapping))
{
reverseCmpOp = getCmpReg2Reg1() ? true : false;
reverseMemOp = getCmpReg2Mem1() ? true : false;
}
// If we are not comparing with a memory operand, one of them evaluates
// to a zero, and the zero is not already on the stack, then we can use
// FTST to save a register.
//
// (With a memory operand, either the constant zero needs to be loaded
// to use FCOM, or the memory operand needs to be loaded to use FTST,
// so there is no gain in using FTST.)
//
// If the constant zero is in the target register, using FTST means the
// comparison will be reversed. We cannot do this if the initial ordering
// of the operands must be maintained.
//
// Finally, if FTST is used and this is the last use of the target, the
// target register may need to be explicitly popped.
//
TR::Register *targetRegisterForFTST = NULL;
TR::Node *targetChildForFTST = NULL;
if (getEvalChild1() && isUnevaluatedZero(firstChild)) // do we need getEvalChild1() here?
{
if ( ((getCmpReg1Reg2() || reverseCmpOp) && !(preventOperandSwapping || mustSwapOperands)) ||
(getCmpReg2Reg1() && !reverseCmpOp))
{
if (getEvalChild2())
{
secondRegister = _cg->evaluate(secondChild);
}
targetRegisterForFTST = secondRegister;
targetChildForFTST = secondChild;
notReversedOperands();
}
}
else if (getEvalChild2() && isUnevaluatedZero(secondChild)) // do we need getEvalChild2() here?
{
if ( (getCmpReg1Reg2() || reverseCmpOp) ||
(getCmpReg2Reg1() && !reverseCmpOp && !(preventOperandSwapping || mustSwapOperands)) )
{
if (getEvalChild1())
{
firstRegister = _cg->evaluate(firstChild);
}
targetRegisterForFTST = firstRegister;
targetChildForFTST = firstChild;
}
}
if (!targetRegisterForFTST)
{
// If we have a choice, evaluate the target operand last. By doing so, we
// help out the register assigner because the target must be TOS. This
// avoids an unneccessary FXCH for the target.
//
if (getEvalChild1() && getEvalChild2())
{
if (getCmpReg1Reg2() || getCmpReg1Mem2())
{
secondRegister = _cg->evaluate(secondChild);
firstRegister = _cg->evaluate(firstChild);
}
else
{
firstRegister = _cg->evaluate(firstChild);
secondRegister = _cg->evaluate(secondChild);
}
}
else
{
if (getEvalChild1())
{
firstRegister = _cg->evaluate(firstChild);
}
if (getEvalChild2())
{
secondRegister = _cg->evaluate(secondChild);
}
}
}
// Adjust the FP precision of feeding operands.
//
if (firstRegister &&
(firstRegister->needsPrecisionAdjustment() ||
comp->getOption(TR_StrictFPCompares) ||
(firstRegister->mayNeedPrecisionAdjustment() && secondChild->getOpCode().isLoadConst()) ||
(firstRegister->mayNeedPrecisionAdjustment() && !secondRegister)))
{
TR::TreeEvaluator::insertPrecisionAdjustment(firstRegister, root, _cg);
}
if (secondRegister &&
(secondRegister->needsPrecisionAdjustment() ||
comp->getOption(TR_StrictFPCompares) ||
(secondRegister->mayNeedPrecisionAdjustment() && firstChild->getOpCode().isLoadConst()) ||
(secondRegister->mayNeedPrecisionAdjustment() && !firstRegister)))
{
TR::TreeEvaluator::insertPrecisionAdjustment(secondRegister, root, _cg);
}
// Generate the compare instruction.
//
if (targetRegisterForFTST)
{
generateFPRegInstruction(FTSTReg, root, targetRegisterForFTST, _cg);
}
else if (!useFCOMIInstructions && (getCmpReg1Mem2() || reverseMemOp))
{
TR::MemoryReference *tempMR = generateX86MemoryReference(secondChild, _cg);
generateFPRegMemInstruction(cmpRegMemOpCode, root, firstRegister, tempMR, _cg);
tempMR->decNodeReferenceCounts(_cg);
}
else if (!useFCOMIInstructions && getCmpReg2Mem1())
{
TR::MemoryReference *tempMR = generateX86MemoryReference(firstChild, _cg);
generateFPRegMemInstruction(cmpRegMemOpCode, root, secondRegister, tempMR, _cg);
notReversedOperands();
tempMR->decNodeReferenceCounts(_cg);
}
else if (getCmpReg1Reg2() || reverseCmpOp)
{
generateFPCompareRegRegInstruction(cmpInstr, root, firstRegister, secondRegister, _cg);
}
else if (getCmpReg2Reg1())
{
generateFPCompareRegRegInstruction(cmpInstr, root, secondRegister, firstRegister, _cg);
notReversedOperands();
}
_cg->decReferenceCount(firstChild);
_cg->decReferenceCount(secondChild);
// Evaluate the comparison.
//
if (getReversedOperands())
{
cmpOp = TR::ILOpCode(cmpOp).getOpCodeForSwapChildren();
TR::Node::recreate(root, cmpOp);
}
if (useFCOMIInstructions && !targetRegisterForFTST)
{
return NULL;
}
// We must manually move the FP condition flags to the EFLAGS register if we don't
// use the FCOMI instructions.
//
TR::Register *accRegister = _cg->allocateRegister();
TR::RegisterDependencyConditions *dependencies = generateRegisterDependencyConditions((uint8_t)1, 1, _cg);
dependencies->addPreCondition(accRegister, TR::RealRegister::eax, _cg);
dependencies->addPostCondition(accRegister, TR::RealRegister::eax, _cg);
generateRegInstruction(STSWAcc, root, accRegister, dependencies, _cg);
// Pop the FTST target register if it is not used any more.
//
if (targetRegisterForFTST &&
targetChildForFTST && targetChildForFTST->getReferenceCount() == 0)
{
generateFPSTiST0RegRegInstruction(FSTRegReg, root, targetRegisterForFTST, targetRegisterForFTST, _cg);
}
return accRegister;
}
/*
* users should call the integerSubtractAnalyser or integerSubtractAnalyserWithExplicitOperands APIs instead of calling this one directly
*/
TR::Register* TR_X86SubtractAnalyser::integerSubtractAnalyserImpl(TR::Node *root,
TR::Node *firstChild,
TR::Node *secondChild,
TR_X86OpCodes regRegOpCode,
TR_X86OpCodes regMemOpCode,
TR_X86OpCodes copyOpCode,
bool needsEflags,
TR::Node *borrow)
{
TR::Register *targetRegister = NULL;
TR::Register *firstRegister = firstChild->getRegister();
TR::Register *secondRegister = secondChild->getRegister();
setInputs(firstChild, firstRegister, secondChild, secondRegister);
bool loadedConst = false;
needsEflags = needsEflags || NEED_CC(root);
if (getEvalChild1())
{
// if firstChild and secondChild are the same node, then we should
// evaluate (take the else path) so that the evaluate for the secondChild
// below will get the correct/already-allocated register.
if (firstRegister == 0 && firstChild->getOpCodeValue() == TR::iconst && (firstChild != secondChild))
{
// An iconst may have to be generated. The iconst will be generated after the
// secondChild is evaluated. Set the loadedConst flag to true.
loadedConst = true;
}
else
{
firstRegister = _cg->evaluate(firstChild);
}
}
if (getEvalChild2())
{
secondRegister = _cg->evaluate(secondChild);
if (firstChild->getRegister())
{
firstRegister = firstChild->getRegister();
}
else if (!loadedConst)
{
firstRegister = _cg->evaluate(firstChild);
}
}
if (loadedConst)
{
if (firstRegister == 0)
{
// firstchild is an inconst and it has not been evaluated.
// Generate the code for an iconst.
firstRegister = _cg->allocateRegister();
TR::TreeEvaluator::insertLoadConstant(firstChild, firstRegister, firstChild->getInt(), TR_RematerializableInt, _cg);
}
else
{
// firstchild was evaluated. The code for an iconst does not need to be generated.
// Set the loadConst flag to false.
loadedConst = false;
}
}
if (borrow != 0)
TR_X86ComputeCC::setCarryBorrow(borrow, true, _cg);
if (getCopyReg1())
{
if (firstChild->getReferenceCount() > 1)
{
TR::Register *thirdReg;
if (firstChild->getOpCodeValue() == TR::iconst && loadedConst)
{
thirdReg = firstRegister;
}
else
{
if (secondChild->getReferenceCount() == 1 && secondRegister != 0 && !needsEflags && (borrow == 0))
{
// use one fewer registers if we negate the clobberable secondRegister and add
// Don't do this though if condition codes are needed. The sequence
// depends on the carry flag being valid as if a sub was done.
//
bool nodeIs64Bit = TR_X86OpCode(regRegOpCode).hasLongSource();
generateRegInstruction(NEGReg(nodeIs64Bit), secondChild, secondRegister, _cg);
thirdReg = secondRegister;
secondRegister = firstRegister;
regRegOpCode = ADDRegReg(nodeIs64Bit);
}
else
{
thirdReg = _cg->allocateRegister();
generateRegRegInstruction(copyOpCode, root, thirdReg, firstRegister, _cg);
}
}
targetRegister = thirdReg;
if (getSubReg3Reg2())
{
generateRegRegInstruction(regRegOpCode, root, thirdReg, secondRegister, _cg);
}
else // assert getSubReg3Mem2() == true
{
TR::MemoryReference *tempMR = generateX86MemoryReference(secondChild, _cg);
generateRegMemInstruction(regMemOpCode, root, thirdReg, tempMR, _cg);
tempMR->decNodeReferenceCounts(_cg);
}
}
else
{
if (getSubReg3Reg2())
{
generateRegRegInstruction(regRegOpCode, root, firstRegister, secondRegister, _cg);
}
else // assert getSubReg3Mem2() == true
{
TR::MemoryReference *tempMR = generateX86MemoryReference(secondChild, _cg);
generateRegMemInstruction(regMemOpCode, root, firstRegister, tempMR, _cg);
tempMR->decNodeReferenceCounts(_cg);
}
targetRegister = firstRegister;
}
}
else if (getSubReg1Reg2())
{
generateRegRegInstruction(regRegOpCode, root, firstRegister, secondRegister, _cg);
targetRegister = firstRegister;
}
else // assert getSubReg1Mem2() == true
{
TR::MemoryReference *tempMR = generateX86MemoryReference(secondChild, _cg);
generateRegMemInstruction(regMemOpCode, root, firstRegister, tempMR, _cg);
targetRegister = firstRegister;
tempMR->decNodeReferenceCounts(_cg);
}
return targetRegister;
}
void TR_OutlinedInstructions::generateOutlinedInstructionsDispatch()
{
// Switch to cold helper instruction stream.
//
TR::Register *vmThreadReg = _cg->getMethodMetaDataRegister();
TR::Instruction *savedFirstInstruction = comp()->getFirstInstruction();
TR::Instruction *savedAppendInstruction = comp()->getAppendInstruction();
comp()->setFirstInstruction(NULL);
comp()->setAppendInstruction(NULL);
new (_cg->trHeapMemory()) TR::X86LabelInstruction(NULL, LABEL, _entryLabel, _cg);
if (_rematerializeVMThread)
{
generateRegInstruction(PUSHReg, _callNode, vmThreadReg, _cg);
generateRestoreVMThreadInstruction ( _callNode, _cg);
TR::MemoryReference *vmThreadMR = generateX86MemoryReference(vmThreadReg, (TR::Compiler->target.is64Bit()) ? 16 : 8, _cg);
generateRegMemInstruction (LRegMem(), _callNode, vmThreadReg, vmThreadMR, _cg);
}
TR::Register *resultReg=NULL;
if (_callNode->getOpCode().isCallIndirect())
resultReg = TR::TreeEvaluator::performCall(_callNode, true, false, _cg);
else
resultReg = TR::TreeEvaluator::performCall(_callNode, false, false, _cg);
if (_rematerializeVMThread)
{
generateRegInstruction(POPReg, _callNode, vmThreadReg, _cg);
}
if (_targetReg)
{
TR_ASSERT(resultReg, "assertion failure");
TR::RegisterPair *targetRegPair = _targetReg->getRegisterPair();
TR::RegisterPair *resultRegPair = resultReg->getRegisterPair();
if (targetRegPair)
{
TR_ASSERT(resultRegPair, "OutlinedInstructions: targetReg is a register pair and resultReg is not");
generateRegRegInstruction(_targetRegMovOpcode, _callNode, targetRegPair->getLowOrder(), resultRegPair->getLowOrder(), _cg);
generateRegRegInstruction(_targetRegMovOpcode, _callNode, targetRegPair->getHighOrder(), resultRegPair->getHighOrder(), _cg);
}
else
{
TR_ASSERT(!resultRegPair, "OutlinedInstructions: resultReg is a register pair and targetReg is not");
generateRegRegInstruction(_targetRegMovOpcode, _callNode, _targetReg, resultReg, _cg);
}
}
_cg->decReferenceCount(_callNode);
if (_restartLabel)
generateLabelInstruction(JMP4, _callNode, _restartLabel, _cg);
else
{
// Java-specific.
// No restart label implies we're not coming back from this call,
// so it's safe to put data after the call. In the case of calling a throw
// helper, there's an ancient busted handshake that expects to find a 4-byte
// offset here, so we have to comply...
//
// When the handshake is removed, we can delete this zero.
//
generateImmInstruction(DDImm4, _callNode, 0, _cg);
}
// Dummy label to delimit the end of the helper call dispatch sequence (for exception ranges).
//
generateLabelInstruction(LABEL, _callNode, TR::LabelSymbol::create(_cg->trHeapMemory(),_cg), _cg);
// Switch from cold helper instruction stream.
//
_firstInstruction = comp()->getFirstInstruction();
_appendInstruction = comp()->getAppendInstruction();
comp()->setFirstInstruction(savedFirstInstruction);
comp()->setAppendInstruction(savedAppendInstruction);
}