//===-- InstrSelectionSupport.cpp -----------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// Target-independent instruction selection code. See SparcInstrSelection.cpp
// for usage.
#include "llvm/CodeGen/InstrSelectionSupport.h"
#include "llvm/CodeGen/InstrSelection.h"
-#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrAnnot.h"
#include "llvm/CodeGen/MachineCodeForInstruction.h"
-#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/InstrForest.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Constants.h"
-#include "llvm/Function.h"
+#include "llvm/BasicBlock.h"
#include "llvm/DerivedTypes.h"
-#include "llvm/iMemory.h"
-using std::vector;
-
-//*************************** Local Functions ******************************/
+#include "../SparcInstrSelectionSupport.h"
+namespace llvm {
// Generate code to load the constant into a TmpInstruction (virtual reg) and
// returns the virtual register.
InsertCodeToLoadConstant(Function *F,
Value* opValue,
Instruction* vmInstr,
- vector<MachineInstr*>& loadConstVec,
+ std::vector<MachineInstr*>& loadConstVec,
TargetMachine& target)
{
// Create a tmp virtual register to hold the constant.
- TmpInstruction* tmpReg = new TmpInstruction(opValue);
MachineCodeForInstruction &mcfi = MachineCodeForInstruction::get(vmInstr);
- mcfi.addTemp(tmpReg);
+ TmpInstruction* tmpReg = new TmpInstruction(mcfi, opValue);
target.getInstrInfo().CreateCodeToLoadConst(target, F, opValue, tmpReg,
loadConstVec, mcfi);
}
-//---------------------------------------------------------------------------
-// Function GetConstantValueAsUnsignedInt
-// Function GetConstantValueAsSignedInt
-//
-// Convenience functions to get the value of an integral constant, for an
-// appropriate integer or non-integer type that can be held in a signed
-// or unsigned integer respectively. The type of the argument must be
-// the following:
-// Signed or unsigned integer
-// Boolean
-// Pointer
-//
-// isValidConstant is set to true if a valid constant was found.
-//---------------------------------------------------------------------------
-
-uint64_t
-GetConstantValueAsUnsignedInt(const Value *V,
- bool &isValidConstant)
-{
- isValidConstant = true;
-
- if (isa<Constant>(V))
- if (const ConstantBool *CB = dyn_cast<ConstantBool>(V))
- return (int64_t)CB->getValue();
- else if (const ConstantSInt *CS = dyn_cast<ConstantSInt>(V))
- return (uint64_t)CS->getValue();
- else if (const ConstantUInt *CU = dyn_cast<ConstantUInt>(V))
- return CU->getValue();
-
- isValidConstant = false;
- return 0;
-}
-
-int64_t
-GetConstantValueAsSignedInt(const Value *V,
- bool &isValidConstant)
-{
- uint64_t C = GetConstantValueAsUnsignedInt(V, isValidConstant);
- if (isValidConstant) {
- if (V->getType()->isSigned() || C < INT64_MAX) // safe to cast to signed
- return (int64_t) C;
- else
- isValidConstant = false;
- }
- return 0;
-}
-
-
-//---------------------------------------------------------------------------
-// Function: FoldGetElemChain
-//
-// Purpose:
-// Fold a chain of GetElementPtr instructions containing only
-// constant offsets into an equivalent (Pointer, IndexVector) pair.
-// Returns the pointer Value, and stores the resulting IndexVector
-// in argument chainIdxVec. This is a helper function for
-// FoldConstantIndices that does the actual folding.
-//---------------------------------------------------------------------------
-
-
-// Check for a constant 0.
-inline bool
-IsZero(Value* idx)
-{
- return (idx == ConstantSInt::getNullValue(idx->getType()));
-}
-
-static Value*
-FoldGetElemChain(InstrTreeNode* ptrNode, vector<Value*>& chainIdxVec,
- bool lastInstHasLeadingNonZero)
-{
- InstructionNode* gepNode = dyn_cast<InstructionNode>(ptrNode);
- GetElementPtrInst* gepInst =
- dyn_cast_or_null<GetElementPtrInst>(gepNode ? gepNode->getInstruction() :0);
-
- // ptr value is not computed in this tree or ptr value does not come from GEP
- // instruction
- if (gepInst == NULL)
- return NULL;
-
- // Return NULL if we don't fold any instructions in.
- Value* ptrVal = NULL;
-
- // Now chase the chain of getElementInstr instructions, if any.
- // Check for any non-constant indices and stop there.
- // Also, stop if the first index of child is a non-zero array index
- // and the last index of the current node is a non-array index:
- // in that case, a non-array declared type is being accessed as an array
- // which is not type-safe, but could be legal.
- //
- InstructionNode* ptrChild = gepNode;
- while (ptrChild && (ptrChild->getOpLabel() == Instruction::GetElementPtr ||
- ptrChild->getOpLabel() == GetElemPtrIdx))
- {
- // Child is a GetElemPtr instruction
- gepInst = cast<GetElementPtrInst>(ptrChild->getValue());
- User::op_iterator OI, firstIdx = gepInst->idx_begin();
- User::op_iterator lastIdx = gepInst->idx_end();
- bool allConstantOffsets = true;
-
- // The first index of every GEP must be an array index.
- assert((*firstIdx)->getType() == Type::LongTy &&
- "INTERNAL ERROR: Structure index for a pointer type!");
-
- // If the last instruction had a leading non-zero index, check if the
- // current one references a sequential (i.e., indexable) type.
- // If not, the code is not type-safe and we would create an illegal GEP
- // by folding them, so don't fold any more instructions.
- //
- if (lastInstHasLeadingNonZero)
- if (! isa<SequentialType>(gepInst->getType()->getElementType()))
- break; // cannot fold in any preceding getElementPtr instrs.
-
- // Check that all offsets are constant for this instruction
- for (OI = firstIdx; allConstantOffsets && OI != lastIdx; ++OI)
- allConstantOffsets = isa<ConstantInt>(*OI);
-
- if (allConstantOffsets)
- { // Get pointer value out of ptrChild.
- ptrVal = gepInst->getPointerOperand();
-
- // Remember if it has leading zero index: it will be discarded later.
- lastInstHasLeadingNonZero = ! IsZero(*firstIdx);
-
- // Insert its index vector at the start, skipping any leading [0]
- chainIdxVec.insert(chainIdxVec.begin(),
- firstIdx + !lastInstHasLeadingNonZero, lastIdx);
-
- // Mark the folded node so no code is generated for it.
- ((InstructionNode*) ptrChild)->markFoldedIntoParent();
-
- // Get the previous GEP instruction and continue trying to fold
- ptrChild = dyn_cast<InstructionNode>(ptrChild->leftChild());
- }
- else // cannot fold this getElementPtr instr. or any preceding ones
- break;
- }
-
- // If the first getElementPtr instruction had a leading [0], add it back.
- // Note that this instruction is the *last* one successfully folded above.
- if (ptrVal && ! lastInstHasLeadingNonZero)
- chainIdxVec.insert(chainIdxVec.begin(), ConstantSInt::get(Type::LongTy,0));
-
- return ptrVal;
-}
-
-
-//---------------------------------------------------------------------------
-// Function: GetGEPInstArgs
-//
-// Purpose:
-// Helper function for GetMemInstArgs that handles the final getElementPtr
-// instruction used by (or same as) the memory operation.
-// Extracts the indices of the current instruction and tries to fold in
-// preceding ones if all indices of the current one are constant.
-//---------------------------------------------------------------------------
-
-Value*
-GetGEPInstArgs(InstructionNode* gepNode,
- vector<Value*>& idxVec,
- bool& allConstantIndices)
-{
- allConstantIndices = true;
- GetElementPtrInst* gepI = cast<GetElementPtrInst>(gepNode->getInstruction());
-
- // Default pointer is the one from the current instruction.
- Value* ptrVal = gepI->getPointerOperand();
- InstrTreeNode* ptrChild = gepNode->leftChild();
-
- // Extract the index vector of the GEP instructin.
- // If all indices are constant and first index is zero, try to fold
- // in preceding GEPs with all constant indices.
- for (User::op_iterator OI=gepI->idx_begin(), OE=gepI->idx_end();
- allConstantIndices && OI != OE; ++OI)
- if (! isa<Constant>(*OI))
- allConstantIndices = false; // note: this also terminates loop!
-
- // If we have only constant indices, fold chains of constant indices
- // in this and any preceding GetElemPtr instructions.
- bool foldedGEPs = false;
- bool leadingNonZeroIdx = gepI && ! IsZero(*gepI->idx_begin());
- if (allConstantIndices)
- if (Value* newPtr = FoldGetElemChain(ptrChild, idxVec, leadingNonZeroIdx))
- {
- ptrVal = newPtr;
- foldedGEPs = true;
- }
-
- // Append the index vector of the current instruction.
- // Skip the leading [0] index if preceding GEPs were folded into this.
- idxVec.insert(idxVec.end(),
- gepI->idx_begin() + (foldedGEPs && !leadingNonZeroIdx),
- gepI->idx_end());
-
- return ptrVal;
-}
-
-//---------------------------------------------------------------------------
-// Function: GetMemInstArgs
-//
-// Purpose:
-// Get the pointer value and the index vector for a memory operation
-// (GetElementPtr, Load, or Store). If all indices of the given memory
-// operation are constant, fold in constant indices in a chain of
-// preceding GetElementPtr instructions (if any), and return the
-// pointer value of the first instruction in the chain.
-// All folded instructions are marked so no code is generated for them.
-//
-// Return values:
-// Returns the pointer Value to use.
-// Returns the resulting IndexVector in idxVec.
-// Returns true/false in allConstantIndices if all indices are/aren't const.
-//---------------------------------------------------------------------------
-
-Value*
-GetMemInstArgs(InstructionNode* memInstrNode,
- vector<Value*>& idxVec,
- bool& allConstantIndices)
-{
- allConstantIndices = false;
- Instruction* memInst = memInstrNode->getInstruction();
- assert(idxVec.size() == 0 && "Need empty vector to return indices");
-
- // If there is a GetElemPtr instruction to fold in to this instr,
- // it must be in the left child for Load and GetElemPtr, and in the
- // right child for Store instructions.
- InstrTreeNode* ptrChild = (memInst->getOpcode() == Instruction::Store
- ? memInstrNode->rightChild()
- : memInstrNode->leftChild());
-
- // Default pointer is the one from the current instruction.
- Value* ptrVal = ptrChild->getValue();
-
- // Find the "last" GetElemPtr instruction: this one or the immediate child.
- // There will be none if this is a load or a store from a scalar pointer.
- InstructionNode* gepNode = NULL;
- if (isa<GetElementPtrInst>(memInst))
- gepNode = memInstrNode;
- else if (isa<InstructionNode>(ptrChild) && isa<GetElementPtrInst>(ptrVal))
- { // Child of load/store is a GEP and memInst is its only use.
- // Use its indices and mark it as folded.
- gepNode = cast<InstructionNode>(ptrChild);
- gepNode->markFoldedIntoParent();
- }
-
- // If there are no indices, return the current pointer.
- // Else extract the pointer from the GEP and fold the indices.
- return gepNode ? GetGEPInstArgs(gepNode, idxVec, allConstantIndices)
- : ptrVal;
-}
-
MachineOperand::MachineOperandType
ChooseRegOrImmed(int64_t intValue,
bool isSigned,
getImmedValue = 0;
if (canUseImmed &&
- target.getInstrInfo().constantFitsInImmedField(opCode, intValue))
- {
+ target.getInstrInfo().constantFitsInImmedField(opCode, intValue)) {
opType = isSigned? MachineOperand::MO_SignExtendedImmed
: MachineOperand::MO_UnextendedImmed;
getImmedValue = intValue;
- }
- else if (intValue == 0 && target.getRegInfo().getZeroRegNum() >= 0)
- {
- opType = MachineOperand::MO_MachineRegister;
- getMachineRegNum = target.getRegInfo().getZeroRegNum();
- }
+ } else if (intValue == 0 && target.getRegInfo().getZeroRegNum() >= 0) {
+ opType = MachineOperand::MO_MachineRegister;
+ getMachineRegNum = target.getRegInfo().getZeroRegNum();
+ }
return opType;
}
getImmedValue = 0;
// To use reg or immed, constant needs to be integer, bool, or a NULL pointer
- Constant *CPV = dyn_cast<Constant>(val);
- if (CPV == NULL ||
- (! CPV->getType()->isIntegral() &&
- ! (isa<PointerType>(CPV->getType()) && CPV->isNullValue())))
+ // TargetInstrInfo::ConvertConstantToIntType() does the right conversions:
+ bool isValidConstant;
+ uint64_t valueToUse =
+ target.getInstrInfo().ConvertConstantToIntType(target, val, val->getType(),
+ isValidConstant);
+ if (! isValidConstant)
return MachineOperand::MO_VirtualRegister;
- // Now get the constant value and check if it fits in the IMMED field.
- // Take advantage of the fact that the max unsigned value will rarely
- // fit into any IMMED field and ignore that case (i.e., cast smaller
- // unsigned constants to signed).
+ // Now check if the constant value fits in the IMMED field.
//
- int64_t intValue;
- if (isa<PointerType>(CPV->getType()))
- intValue = 0; // We checked above that it is NULL
- else if (ConstantBool* CB = dyn_cast<ConstantBool>(CPV))
- intValue = (int64_t) CB->getValue();
- else if (CPV->getType()->isSigned())
- intValue = cast<ConstantSInt>(CPV)->getValue();
- else
- { // get the int value and sign-extend if original was less than 64 bits
- intValue = (int64_t) cast<ConstantUInt>(CPV)->getValue();
- switch(CPV->getType()->getPrimitiveID())
- {
- case Type::UByteTyID: intValue = (int64_t) (int8_t) intValue; break;
- case Type::UShortTyID: intValue = (int64_t) (short) intValue; break;
- case Type::UIntTyID: intValue = (int64_t) (int) intValue; break;
- default: break;
- }
- }
-
- return ChooseRegOrImmed(intValue, CPV->getType()->isSigned(),
+ return ChooseRegOrImmed((int64_t) valueToUse, val->getType()->isSigned(),
opCode, target, canUseImmed,
getMachineRegNum, getImmedValue);
}
-
-
//---------------------------------------------------------------------------
// Function: FixConstantOperandsForInstr
//
// fall under case 3; these must be inserted before `minstr'.
//---------------------------------------------------------------------------
-vector<MachineInstr*>
+std::vector<MachineInstr*>
FixConstantOperandsForInstr(Instruction* vmInstr,
MachineInstr* minstr,
TargetMachine& target)
{
- vector<MachineInstr*> MVec;
+ std::vector<MachineInstr*> MVec;
- MachineOpCode opCode = minstr->getOpCode();
+ MachineOpCode opCode = minstr->getOpcode();
const TargetInstrInfo& instrInfo = target.getInstrInfo();
int resultPos = instrInfo.getResultPos(opCode);
int immedPos = instrInfo.getImmedConstantPos(opCode);
MachineOperand::MO_VirtualRegister;
// Operand may be a virtual register or a compile-time constant
- if (mop.getType() == MachineOperand::MO_VirtualRegister)
- {
- assert(mop.getVRegValue() != NULL);
- if (Constant *opConst = dyn_cast<Constant>(mop.getVRegValue())) {
- opType = ChooseRegOrImmed(opConst, opCode, target,
- (immedPos == (int)op), machineRegNum,
- immedValue);
- if (opType == MachineOperand::MO_VirtualRegister)
- constantThatMustBeLoaded = true;
- }
+ if (mop.getType() == MachineOperand::MO_VirtualRegister) {
+ assert(mop.getVRegValue() != NULL);
+ opValue = mop.getVRegValue();
+ if (Constant *opConst = dyn_cast<Constant>(opValue)) {
+ opType = ChooseRegOrImmed(opConst, opCode, target,
+ (immedPos == (int)op), machineRegNum,
+ immedValue);
+ if (opType == MachineOperand::MO_VirtualRegister)
+ constantThatMustBeLoaded = true;
+ }
+ } else {
+ //
+ // If the operand is from the constant pool, don't try to change it.
+ //
+ if (mop.getType() == MachineOperand::MO_ConstantPoolIndex) {
+ continue;
+ }
+ assert(mop.isImmediate());
+ bool isSigned = mop.getType() == MachineOperand::MO_SignExtendedImmed;
+
+ // Bit-selection flags indicate an instruction that is extracting
+ // bits from its operand so ignore this even if it is a big constant.
+ if (mop.isHiBits32() || mop.isLoBits32() ||
+ mop.isHiBits64() || mop.isLoBits64())
+ continue;
+
+ opType = ChooseRegOrImmed(mop.getImmedValue(), isSigned,
+ opCode, target, (immedPos == (int)op),
+ machineRegNum, immedValue);
+
+ if (opType == MachineOperand::MO_SignExtendedImmed ||
+ opType == MachineOperand::MO_UnextendedImmed) {
+ // The optype is an immediate value
+ // This means we need to change the opcode, e.g. ADDr -> ADDi
+ unsigned newOpcode = convertOpcodeFromRegToImm(opCode);
+ minstr->setOpcode(newOpcode);
}
- else
- {
- assert(mop.isImmediate());
- bool isSigned = mop.getType() == MachineOperand::MO_SignExtendedImmed;
-
- // Bit-selection flags indicate an instruction that is extracting
- // bits from its operand so ignore this even if it is a big constant.
- if (mop.opHiBits32() || mop.opLoBits32() ||
- mop.opHiBits64() || mop.opLoBits64())
- continue;
-
- opType = ChooseRegOrImmed(mop.getImmedValue(), isSigned,
- opCode, target, (immedPos == (int)op),
- machineRegNum, immedValue);
- if (opType == mop.getType())
- continue; // no change: this is the most common case
+ if (opType == mop.getType())
+ continue; // no change: this is the most common case
- if (opType == MachineOperand::MO_VirtualRegister)
- {
- constantThatMustBeLoaded = true;
- opValue = isSigned
- ? (Value*)ConstantSInt::get(Type::LongTy, immedValue)
- : (Value*)ConstantUInt::get(Type::ULongTy,(uint64_t)immedValue);
- }
+ if (opType == MachineOperand::MO_VirtualRegister) {
+ constantThatMustBeLoaded = true;
+ opValue = isSigned
+ ? (Value*)ConstantSInt::get(Type::LongTy, immedValue)
+ : (Value*)ConstantUInt::get(Type::ULongTy,(uint64_t)immedValue);
}
+ }
if (opType == MachineOperand::MO_MachineRegister)
minstr->SetMachineOperandReg(op, machineRegNum);
else if (opType == MachineOperand::MO_SignExtendedImmed ||
- opType == MachineOperand::MO_UnextendedImmed)
+ opType == MachineOperand::MO_UnextendedImmed) {
minstr->SetMachineOperandConst(op, opType, immedValue);
- else if (constantThatMustBeLoaded ||
+ // The optype is or has become an immediate
+ // This means we need to change the opcode, e.g. ADDr -> ADDi
+ unsigned newOpcode = convertOpcodeFromRegToImm(opCode);
+ minstr->setOpcode(newOpcode);
+ } else if (constantThatMustBeLoaded ||
(opValue && isa<GlobalValue>(opValue)))
{ // opValue is a constant that must be explicitly loaded into a reg
assert(opValue);
InsertCodeToLoadConstant(F, oldVal, vmInstr, MVec, target);
minstr->setImplicitRef(i, tmpReg);
- if (isCall)
- { // find and replace the argument in the CallArgsDescriptor
- unsigned i=lastCallArgNum;
- while (argDesc->getArgInfo(i).getArgVal() != oldVal)
- ++i;
- assert(i < argDesc->getNumArgs() &&
- "Constant operands to a call *must* be in the arg list");
- lastCallArgNum = i;
- argDesc->getArgInfo(i).replaceArgVal(tmpReg);
- }
+ if (isCall) {
+ // find and replace the argument in the CallArgsDescriptor
+ unsigned i=lastCallArgNum;
+ while (argDesc->getArgInfo(i).getArgVal() != oldVal)
+ ++i;
+ assert(i < argDesc->getNumArgs() &&
+ "Constant operands to a call *must* be in the arg list");
+ lastCallArgNum = i;
+ argDesc->getArgInfo(i).replaceArgVal(tmpReg);
+ }
}
return MVec;
}
+
+} // End llvm namespace
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