-// $Id$
-//***************************************************************************
-// File:
-// SparcInstrSelection.cpp
-//
-// Purpose:
-// BURS instruction selection for SPARC V9 architecture.
-//
-// History:
-// 7/02/01 - Vikram Adve - Created
-//**************************************************************************/
+//===-- SparcInstrSelection.cpp -------------------------------------------===//
+//
+// BURS instruction selection for SPARC V9 architecture.
+//
+//===----------------------------------------------------------------------===//
#include "SparcInternals.h"
#include "SparcInstrSelectionSupport.h"
#include "llvm/iTerminators.h"
#include "llvm/iMemory.h"
#include "llvm/iOther.h"
-#include "llvm/BasicBlock.h"
#include "llvm/Function.h"
#include "llvm/Constants.h"
+#include "llvm/ConstantHandling.h"
#include "Support/MathExtras.h"
#include <math.h>
using std::vector;
-//************************* Forward Declarations ***************************/
-
-
-static void SetMemOperands_Internal (vector<MachineInstr*>& mvec,
- vector<MachineInstr*>::iterator mvecI,
- const InstructionNode* vmInstrNode,
- Value* ptrVal,
- std::vector<Value*>& idxVec,
- bool allConstantIndices,
- const TargetMachine& target);
-
-
//************************ Internal Functions ******************************/
static TmpInstruction*
GetTmpForCC(Value* boolVal, const Function *F, const Type* ccType)
{
- typedef std::hash_map<const Value*, TmpInstruction*> BoolTmpCache;
+ typedef hash_map<const Value*, TmpInstruction*> BoolTmpCache;
static BoolTmpCache boolToTmpCache; // Map boolVal -> TmpInstruction*
static const Function *lastFunction = 0;// Use to flush cache between funcs
bool& isFPBranch)
{
InstructionNode* setCCNode = (InstructionNode*) instrNode->leftChild();
- BinaryOperator* setCCInstr = (BinaryOperator*) setCCNode->getInstruction();
+ assert(setCCNode->getOpLabel() == SetCCOp);
+ BinaryOperator* setCCInstr =cast<BinaryOperator>(setCCNode->getInstruction());
const Type* setCCType = setCCInstr->getOperand(0)->getType();
isFPBranch = setCCType->isFloatingPoint(); // Return value: don't delete!
}
static inline MachineOpCode
-ChooseConvertToIntInstr(OpLabel vopCode, const Type* opType)
+ChooseConvertFPToIntInstr(Type::PrimitiveID tid, const Type* opType)
{
MachineOpCode opCode = INVALID_OPCODE;;
-
- if (vopCode == ToSByteTy || vopCode == ToShortTy || vopCode == ToIntTy)
+
+ assert((opType == Type::FloatTy || opType == Type::DoubleTy)
+ && "This function should only be called for FLOAT or DOUBLE");
+
+ if (tid==Type::UIntTyID)
{
- switch (opType->getPrimitiveID())
- {
- case Type::FloatTyID: opCode = FSTOI; break;
- case Type::DoubleTyID: opCode = FDTOI; break;
- default:
- assert(0 && "Non-numeric non-bool type cannot be converted to Int");
- break;
- }
+ assert(tid != Type::UIntTyID && "FP-to-uint conversions must be expanded"
+ " into FP->long->uint for SPARC v9: SO RUN PRESELECTION PASS!");
}
- else if (vopCode == ToLongTy)
+ else if (tid==Type::SByteTyID || tid==Type::ShortTyID || tid==Type::IntTyID ||
+ tid==Type::UByteTyID || tid==Type::UShortTyID)
{
- switch (opType->getPrimitiveID())
- {
- case Type::FloatTyID: opCode = FSTOX; break;
- case Type::DoubleTyID: opCode = FDTOX; break;
- default:
- assert(0 && "Non-numeric non-bool type cannot be converted to Long");
- break;
- }
+ opCode = (opType == Type::FloatTy)? FSTOI : FDTOI;
+ }
+ else if (tid==Type::LongTyID || tid==Type::ULongTyID)
+ {
+ opCode = (opType == Type::FloatTy)? FSTOX : FDTOX;
}
else
assert(0 && "Should not get here, Mo!");
-
+
return opCode;
}
MachineInstr*
-CreateConvertToIntInstr(OpLabel vopCode, Value* srcVal, Value* destVal)
+CreateConvertFPToIntInstr(Type::PrimitiveID destTID,
+ Value* srcVal, Value* destVal)
{
- MachineOpCode opCode = ChooseConvertToIntInstr(vopCode, srcVal->getType());
+ MachineOpCode opCode = ChooseConvertFPToIntInstr(destTID, srcVal->getType());
assert(opCode != INVALID_OPCODE && "Expected to need conversion!");
MachineInstr* M = new MachineInstr(opCode);
return M;
}
+// CreateCodeToConvertFloatToInt: Convert FP value to signed or unsigned integer
+// The FP value must be converted to the dest type in an FP register,
+// and the result is then copied from FP to int register via memory.
+//
+// Since fdtoi converts to signed integers, any FP value V between MAXINT+1
+// and MAXUNSIGNED (i.e., 2^31 <= V <= 2^32-1) would be converted incorrectly
+// *only* when converting to an unsigned int. (Unsigned byte, short or long
+// don't have this problem.)
+// For unsigned int, we therefore have to generate the code sequence:
+//
+// if (V > (float) MAXINT) {
+// unsigned result = (unsigned) (V - (float) MAXINT);
+// result = result + (unsigned) MAXINT;
+// }
+// else
+// result = (unsigned int) V;
+//
+static void
+CreateCodeToConvertFloatToInt(const TargetMachine& target,
+ Value* opVal,
+ Instruction* destI,
+ std::vector<MachineInstr*>& mvec,
+ MachineCodeForInstruction& mcfi)
+{
+ // Create a temporary to represent the FP register into which the
+ // int value will placed after conversion. The type of this temporary
+ // depends on the type of FP register to use: single-prec for a 32-bit
+ // int or smaller; double-prec for a 64-bit int.
+ //
+ size_t destSize = target.DataLayout.getTypeSize(destI->getType());
+ const Type* destTypeToUse = (destSize > 4)? Type::DoubleTy : Type::FloatTy;
+ TmpInstruction* destForCast = new TmpInstruction(destTypeToUse, opVal);
+ mcfi.addTemp(destForCast);
+
+ // Create the fp-to-int conversion code
+ MachineInstr* M =CreateConvertFPToIntInstr(destI->getType()->getPrimitiveID(),
+ opVal, destForCast);
+ mvec.push_back(M);
+
+ // Create the fpreg-to-intreg copy code
+ target.getInstrInfo().
+ CreateCodeToCopyFloatToInt(target, destI->getParent()->getParent(),
+ destForCast, destI, mvec, mcfi);
+}
+
+
static inline MachineOpCode
ChooseAddInstruction(const InstructionNode* instrNode)
{
{
MachineOpCode opCode = INVALID_OPCODE;
- if (resultType->isInteg
ral() || isa<PointerType>(resultType))
+ if (resultType->isInteg
er() || isa<PointerType>(resultType))
{
opCode = SUB;
}
{
MachineOpCode opCode = INVALID_OPCODE;
- if (resultType->isIntegral())
+ if (resultType->isInteger())
opCode = MULX;
else
switch(resultType->getPrimitiveID())
// of dest, so we need to put the result of the SLL into a temporary.
//
Value* shiftDest = destVal;
- const Type* opType = argVal1->getType();
unsigned opSize = target.DataLayout.getTypeSize(argVal1->getType());
if ((shiftOpCode == SLL || shiftOpCode == SLLX)
&& opSize < target.DataLayout.getIntegerRegize())
{ // extend the sign-bit of the result into all upper bits of dest
assert(8*opSize <= 32 && "Unexpected type size > 4 and < IntRegSize?");
target.getInstrInfo().
- CreateSignExtensionInstructions(target, F, shiftDest, 8*opSize,
- destVal, mvec, mcfi);
+ CreateSignExtensionInstructions(target, F, shiftDest, destVal,
+ 8*opSize, mvec, mcfi);
}
}
//
const Type* resultType = destVal->getType();
- if (resultType->isInteg
ral() || isa<PointerType>(resultType))
+ if (resultType->isInteg
er() || isa<PointerType>(resultType))
{
bool isValidConst;
int64_t C = GetConstantValueAsSignedInt(constOp, isValidConst);
{
Value* constOp;
if (isa<Constant>(lval) && isa<Constant>(rval))
- { // both operands are constant: try both orders!
- vector<MachineInstr*> mvec1, mvec2;
- unsigned int lcost = CreateMulConstInstruction(target, F, lval, rval,
- destVal, mvec1, mcfi);
- unsigned int rcost = CreateMulConstInstruction(target, F, rval, lval,
- destVal, mvec2, mcfi);
- vector<MachineInstr*>& mincostMvec = (lcost <= rcost)? mvec1 : mvec2;
- vector<MachineInstr*>& maxcostMvec = (lcost <= rcost)? mvec2 : mvec1;
- mvec.insert(mvec.end(), mincostMvec.begin(), mincostMvec.end());
-
- for (unsigned int i=0; i < maxcostMvec.size(); ++i)
- delete maxcostMvec[i];
+ { // both operands are constant: evaluate and "set" in dest
+ Constant* P = ConstantFoldBinaryInstruction(Instruction::Mul,
+ cast<Constant>(lval), cast<Constant>(rval));
+ target.getInstrInfo().CreateCodeToLoadConst(target,F,P,destVal,mvec,mcfi);
}
else if (isa<Constant>(rval)) // rval is constant, but not lval
CreateMulConstInstruction(target, F, lval, rval, destVal, mvec, mcfi);
const Type* resultType = instrNode->getInstruction()->getType();
- if (resultType->isIntegral())
+ if (resultType->isInteger())
opCode = resultType->isSigned()? SDIVX : UDIVX;
else
switch(resultType->getPrimitiveID())
//
const Type* resultType = instrNode->getInstruction()->getType();
- if (resultType->isIntegral())
+ if (resultType->isInteger())
{
unsigned pow;
bool isValidConst;
vector<MachineInstr*>& getMvec)
{
MachineInstr* M;
-
+ MachineCodeForInstruction& mcfi = MachineCodeForInstruction::get(result);
+
// Create a Value to hold the (constant) element size
Value* tsizeVal = ConstantSInt::get(Type::IntTy, tsize);
// Create a temporary value to hold the result of MUL
TmpInstruction* tmpProd = new TmpInstruction(numElementsVal, tsizeVal);
- MachineCodeForInstruction::get(result).addTemp(tmpProd);
+ mcfi.addTemp(tmpProd);
// Instruction 1: mul numElements, typeSize -> tmpProd
- M = new MachineInstr(MULX);
- M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister, numElementsVal);
- M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister, tsizeVal);
- M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister, tmpProd);
- getMvec.push_back(M);
+ CreateMulInstruction(target, F, numElementsVal, tsizeVal, tmpProd, getMvec,
+ mcfi, INVALID_MACHINE_OPCODE);
// Instruction 2: sub %sp, tmpProd -> %sp
M = new MachineInstr(SUB);
unsigned int numElements,
vector<MachineInstr*>& getMvec)
{
+ assert(tsize > 0 && "Illegal (zero) type size for alloca");
assert(result && result->getParent() &&
"Result value is not part of a function?");
Function *F = result->getParent()->getParent();
}
-
-
-
//------------------------------------------------------------------------
// Function SetOperandsForMemInstr
//
static void
SetOperandsForMemInstr(vector<MachineInstr*>& mvec,
- vector<MachineInstr*>::iterator mvecI,
- const InstructionNode* vmInstrNode,
+ InstructionNode* vmInstrNode,
const TargetMachine& target)
{
- MemAccessInst* memInst = (MemAccessInst*) vmInstrNode->getInstruction();
-
- // Variables to hold the index vector and ptr value.
- // The major work here is to extract these for all 3 instruction types
- // and to try to fold chains of constant indices into a single offset.
- // After that, we call SetMemOperands_Internal(), which creates the
- // appropriate operands for the machine instruction.
- vector<Value*> idxVec;
- bool allConstantIndices = true;
- Value* ptrVal = memInst->getPointerOperand();
-
- // 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 = (vmInstrNode->getOpLabel() == Instruction::Store
- ? vmInstrNode->rightChild()
- : vmInstrNode->leftChild());
-
- // Check if all indices are constant for this instruction
- for (MemAccessInst::op_iterator OI=memInst->idx_begin();
- OI != memInst->idx_end(); ++OI)
- if (! isa<ConstantUInt>(*OI))
- {
- allConstantIndices = false;
- break;
- }
-
- // If we have only constant indices, fold chains of constant indices
- // in this and any preceding GetElemPtr instructions.
- if (allConstantIndices &&
- ptrChild->getOpLabel() == Instruction::GetElementPtr ||
- ptrChild->getOpLabel() == GetElemPtrIdx)
- {
- Value* newPtr = FoldGetElemChain((InstructionNode*) ptrChild, idxVec);
- if (newPtr)
- ptrVal = newPtr;
- }
-
- // Append the index vector of the current instruction, if any.
- // Discard any leading [0] index.
- if (memInst->idx_begin() != memInst->idx_end())
- {
- const ConstantUInt* CV = dyn_cast<ConstantUInt>(memInst->idx_begin()->get());
- unsigned zeroOrIOne = (CV && CV->getType() == Type::UIntTy &&
- (CV->getValue() == 0))? 1 : 0;
- idxVec.insert(idxVec.end(),
- memInst->idx_begin()+zeroOrIOne, memInst->idx_end());
- }
-
- // Now create the appropriate operands for the machine instruction
- SetMemOperands_Internal(mvec, mvecI, vmInstrNode,
- ptrVal, idxVec, allConstantIndices, target);
-}
+ Instruction* memInst = vmInstrNode->getInstruction();
+ vector<MachineInstr*>::iterator mvecI = mvec.end() - 1;
+ // Index vector, ptr value, and flag if all indices are const.
+ vector<Value*> idxVec;
+ bool allConstantIndices;
+ Value* ptrVal = GetMemInstArgs(vmInstrNode, idxVec, allConstantIndices);
-// Generate the correct operands (and additional instructions if needed)
-// for the given pointer and given index vector.
-//
-static void
-SetMemOperands_Internal(vector<MachineInstr*>& mvec,
- vector<MachineInstr*>::iterator mvecI,
- const InstructionNode* vmInstrNode,
- Value* ptrVal,
- vector<Value*>& idxVec,
- bool allConstantIndices,
- const TargetMachine& target)
-{
- MemAccessInst* memInst = (MemAccessInst*) vmInstrNode->getInstruction();
-
- // Initialize so we default to storing the offset in a register.
+ // Now create the appropriate operands for the machine instruction.
+ // First, initialize so we default to storing the offset in a register.
int64_t smallConstOffset = 0;
Value* valueForRegOffset = NULL;
- MachineOperand::MachineOperandType offsetOpType =MachineOperand::MO_VirtualRegister;
+ MachineOperand::MachineOperandType offsetOpType =
+ MachineOperand::MO_VirtualRegister;
// Check if there is an index vector and if so, compute the
// right offset for structures and for arrays
//
- if (idxVec.size() > 0)
+ if (!idxVec.empty())
{
const PointerType* ptrType = cast<PointerType>(ptrVal->getType());
else
{
// There is at least one non-constant offset. Therefore, this must
- // be an array ref, and must have been lowered to a single offset.
- assert((memInst->getNumOperands()
- == (unsigned) 1 + memInst->getFirstIndexOperandNumber())
+ // be an array ref, and must have been lowered to a single non-zero
+ // offset. (An extra leading zero offset, if any, can be ignored.)
+ // Generate code sequence to compute address from index.
+ //
+ bool firstIdxIsZero =
+ (idxVec[0] == Constant::getNullValue(idxVec[0]->getType()));
+ assert(idxVec.size() == 1U + firstIdxIsZero
&& "Array refs must be lowered before Instruction Selection");
-
- Value* arrayOffsetVal = * memInst->idx_begin();
-
- // Handle special common case of leading [0] index.
- ConstantUInt* CV = dyn_cast<ConstantUInt>(idxVec.front());
- bool firstIndexIsZero = bool(CV && CV->getType() == Type::UIntTy &&
- (CV->getValue() == 0));
-
- // If index is 0, the offset value is just 0. Otherwise,
- // generate a MUL instruction to compute address from index.
+
+ Value* idxVal = idxVec[firstIdxIsZero];
+
+ vector<MachineInstr*> mulVec;
+ Instruction* addr = new TmpInstruction(Type::ULongTy, memInst);
+ MachineCodeForInstruction::get(memInst).addTemp(addr);
+
+ // Get the array type indexed by idxVal, and compute its element size.
// The call to getTypeSize() will fail if size is not constant.
+ const Type* vecType = (firstIdxIsZero
+ ? GetElementPtrInst::getIndexedType(ptrType,
+ std::vector<Value*>(1U, idxVec[0]),
+ /*AllowCompositeLeaf*/ true)
+ : ptrType);
+ const Type* eltType = cast<SequentialType>(vecType)->getElementType();
+ ConstantUInt* eltSizeVal = ConstantUInt::get(Type::ULongTy,
+ target.DataLayout.getTypeSize(eltType));
+
// CreateMulInstruction() folds constants intelligently enough.
- //
- if (firstIndexIsZero)
- {
- offsetOpType = MachineOperand::MO_SignExtendedImmed;
- smallConstOffset = 0;
- }
- else
- {
- vector<MachineInstr*> mulVec;
- Instruction* addr = new TmpInstruction(Type::UIntTy, memInst);
- MachineCodeForInstruction::get(memInst).addTemp(addr);
-
- unsigned int eltSize =
- target.DataLayout.getTypeSize(ptrType->getElementType());
- assert(eltSize > 0 && "Invalid or non-const array element size");
- ConstantUInt* eltVal = ConstantUInt::get(Type::UIntTy, eltSize);
-
- CreateMulInstruction(target,
- memInst->getParent()->getParent(),
- arrayOffsetVal, /* lval, not likely const */
- eltVal, /* rval, likely constant */
- addr, /* result*/
- mulVec,
- MachineCodeForInstruction::get(memInst),
- INVALID_MACHINE_OPCODE);
- assert(mulVec.size() > 0 && "No multiply instruction created?");
- for (vector<MachineInstr*>::const_iterator I = mulVec.begin();
- I != mulVec.end(); ++I)
- {
- mvecI = mvec.insert(mvecI, *I); // ptr to inserted value
- ++mvecI; // ptr to mem. instr.
- }
-
- valueForRegOffset = addr;
- }
+ CreateMulInstruction(target, memInst->getParent()->getParent(),
+ idxVal, /* lval, not likely to be const*/
+ eltSizeVal, /* rval, likely to be constant */
+ addr, /* result */
+ mulVec, MachineCodeForInstruction::get(memInst),
+ INVALID_MACHINE_OPCODE);
+
+ // Insert mulVec[] before *mvecI in mvec[] and update mvecI
+ // to point to the same instruction it pointed to before.
+ assert(mulVec.size() > 0 && "No multiply code created?");
+ vector<MachineInstr*>::iterator oldMvecI = mvecI;
+ for (unsigned i=0, N=mulVec.size(); i < N; ++i)
+ mvecI = mvec.insert(mvecI, mulVec[i]) + 1; // pts to mem instr
+
+ valueForRegOffset = addr;
}
}
else
offsetOpType = MachineOperand::MO_SignExtendedImmed;
smallConstOffset = 0;
}
-
+
// For STORE:
// Operand 0 is value, operand 1 is ptr, operand 2 is offset
// For LOAD or GET_ELEMENT_PTR,
switch(eruleno)
{
case 111: // stmt: reg
- case 113: // stmt: bool
case 123:
case 124:
case 125:
case 242:
case 243:
case 244:
+ case 245:
case 321:
return true; break;
-
+
default:
return false; break;
}
vector<MachineInstr*>& mvec)
{
bool checkCast = false; // initialize here to use fall-through
+ bool maskUnsignedResult = false;
int nextRule;
int forwardOperandNum = -1;
unsigned int allocaSize = 0;
mvec.push_back(new MachineInstr(
ChooseStoreInstruction(
subtreeRoot->leftChild()->getValue()->getType())));
- SetOperandsForMemInstr(mvec, mvec.end()-1, subtreeRoot, target);
+ SetOperandsForMemInstr(mvec, subtreeRoot, target);
break;
case 5: // stmt: BrUncond
Constant *constVal = cast<Constant>(constNode->getValue());
bool isValidConst;
- if ((constVal->getType()->isIntegral()
+ if ((constVal->getType()->isInteger()
|| isa<PointerType>(constVal->getType()))
&& GetConstantValueAsSignedInt(constVal, isValidConst) == 0
&& isValidConst)
// ELSE FALL THROUGH
}
- case 6: // stmt: BrCond(bool)
- { // bool => boolean was computed with some boolean operator
- // (SetCC, Not, ...). We need to check whether the type was a FP,
- // signed int or unsigned int, and check the branching condition in
- // order to choose the branch to use.
+ case 6: // stmt: BrCond(setCC)
+ { // bool => boolean was computed with SetCC.
+ // The branch to use depends on whether it is FP, signed, or unsigned.
// If it is an integer CC, we also need to find the unique
// TmpInstruction representing that CC.
//
BranchInst* brInst = cast<BranchInst>(subtreeRoot->getInstruction());
bool isFPBranch;
M = new MachineInstr(ChooseBccInstruction(subtreeRoot, isFPBranch));
-
+
Value* ccValue = GetTmpForCC(subtreeRoot->leftChild()->getValue(),
brInst->getParent()->getParent(),
isFPBranch? Type::FloatTy : Type::IntTy);
M->SetMachineOperandVal(1, MachineOperand::MO_PCRelativeDisp,
brInst->getSuccessor(0));
mvec.push_back(M);
-
+
// delay slot
mvec.push_back(new MachineInstr(NOP));
-
+
// false branch
M = new MachineInstr(BA);
M->SetMachineOperandVal(0, MachineOperand::MO_PCRelativeDisp,
brInst->getSuccessor(1));
mvec.push_back(M);
-
+
// delay slot
mvec.push_back(new MachineInstr(NOP));
break;
assert(0 && "VRegList should never be the topmost non-chain rule");
break;
- case 21: // bool: Not(bool): Both these are implemented as:
- case 421: // reg: BNot(reg) : reg = reg XOR-NOT 0
- M = new MachineInstr(XNOR);
- M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
- subtreeRoot->leftChild()->getValue());
- M->SetMachineOperandReg(1, target.getRegInfo().getZeroRegNum());
- M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,
- subtreeRoot->getValue());
- mvec.push_back(M);
+ case 21: // bool: Not(bool,reg): Both these are implemented as:
+ case 421: // reg: BNot(reg,reg): reg = reg XOR-NOT 0
+ { // First find the unary operand. It may be left or right, usually right.
+ Value* notArg = BinaryOperator::getNotArgument(
+ cast<BinaryOperator>(subtreeRoot->getInstruction()));
+ mvec.push_back(Create3OperandInstr_Reg(XNOR, notArg,
+ target.getRegInfo().getZeroRegNum(),
+ subtreeRoot->getValue()));
break;
+ }
- case 322: // reg: ToBoolTy(bool):
case 22: // reg: ToBoolTy(reg):
{
const Type* opType = subtreeRoot->leftChild()->getValue()->getType();
- assert(opType->isIntegral() || isa<PointerType>(opType)
- || opType == Type::BoolTy);
+ assert(opType->isIntegral() || isa<PointerType>(opType));
forwardOperandNum = 0; // forward first operand to user
break;
}
case 23: // reg: ToUByteTy(reg)
+ case 24: // reg: ToSByteTy(reg)
case 25: // reg: ToUShortTy(reg)
+ case 26: // reg: ToShortTy(reg)
case 27: // reg: ToUIntTy(reg)
- case 29: // reg: ToULongTy(reg)
+ case 28: // reg: ToIntTy(reg)
{
+ //======================================================================
+ // Rules for integer conversions:
+ //
+ //--------
+ // From ISO 1998 C++ Standard, Sec. 4.7:
+ //
+ // 2. If the destination type is unsigned, the resulting value is
+ // the least unsigned integer congruent to the source integer
+ // (modulo 2n where n is the number of bits used to represent the
+ // unsigned type). [Note: In a two s complement representation,
+ // this conversion is conceptual and there is no change in the
+ // bit pattern (if there is no truncation). ]
+ //
+ // 3. If the destination type is signed, the value is unchanged if
+ // it can be represented in the destination type (and bitfield width);
+ // otherwise, the value is implementation-defined.
+ //--------
+ //
+ // Since we assume 2s complement representations, this implies:
+ //
+ // -- if operand is smaller than destination, zero-extend or sign-extend
+ // according to the signedness of the *operand*: source decides.
+ // ==> we have to do nothing here!
+ //
+ // -- if operand is same size as or larger than destination, and the
+ // destination is *unsigned*, zero-extend the operand: dest. decides
+ //
+ // -- if operand is same size as or larger than destination, and the
+ // destination is *signed*, the choice is implementation defined:
+ // we sign-extend the operand: i.e., again dest. decides.
+ // Note: this matches both Sun's cc and gcc3.2.
+ //======================================================================
+
Instruction* destI = subtreeRoot->getInstruction();
Value* opVal = subtreeRoot->leftChild()->getValue();
- const Type* opType = subtreeRoot->leftChild()->getValue()->getType();
- assert(opType->isIntegral() ||
- isa<PointerType>(opType) ||
- opType == Type::BoolTy && "Cast is illegal for other types");
-
- unsigned opSize = target.DataLayout.getTypeSize(opType);
- unsigned destSize = target.DataLayout.getTypeSize(destI->getType());
-
- if (opSize > destSize ||
- (opType->isSigned()
- && destSize < target.DataLayout.getIntegerRegize()))
- { // operand is larger than dest,
- // OR both are equal but smaller than the full register size
- // AND operand is signed, so it may have extra sign bits:
- // mask high bits using AND
- //
- M = Create3OperandInstr(AND, opVal,
- ConstantUInt::get(Type::ULongTy,
- ((uint64_t) 1 << 8*destSize) - 1),
- destI);
- mvec.push_back(M);
+ const Type* opType = opVal->getType();
+ if (opType->isIntegral() || isa<PointerType>(opType))
+ {
+ unsigned opSize = target.DataLayout.getTypeSize(opType);
+ unsigned destSize = target.DataLayout.getTypeSize(destI->getType());
+ if (opSize >= destSize)
+ { // Operand is same size as or larger than dest:
+ // zero- or sign-extend, according to the signeddness of
+ // the destination (see above).
+ if (destI->getType()->isSigned())
+ target.getInstrInfo().CreateSignExtensionInstructions(target,
+ destI->getParent()->getParent(), opVal, destI, 8*destSize,
+ mvec, MachineCodeForInstruction::get(destI));
+ else
+ target.getInstrInfo().CreateZeroExtensionInstructions(target,
+ destI->getParent()->getParent(), opVal, destI, 8*destSize,
+ mvec, MachineCodeForInstruction::get(destI));
+ }
+ else
+ forwardOperandNum = 0; // forward first operand to user
+ }
+ else if (opType->isFloatingPoint())
+ {
+ CreateCodeToConvertFloatToInt(target, opVal, destI, mvec,
+ MachineCodeForInstruction::get(destI));
+ if (destI->getType()->isUnsigned())
+ maskUnsignedResult = true; // not handled by fp->int code
}
else
- forwardOperandNum = 0; // forward first operand to user
-
+ assert(0 && "Unrecognized operand type for convert-to-unsigned");
+
break;
}
-
- case 24: // reg: ToSByteTy(reg)
- case 26: // reg: ToShortTy(reg)
- case 28: // reg: ToIntTy(reg)
+
+ case 29: // reg: ToULongTy(reg)
case 30: // reg: ToLongTy(reg)
{
- unsigned int oldMvecSize = mvec.size(); // to check if it grew
- Instruction* destI = subtreeRoot->getInstruction();
Value* opVal = subtreeRoot->leftChild()->getValue();
- MachineCodeForInstruction& mcfi =MachineCodeForInstruction::get(destI);
-
const Type* opType = opVal->getType();
- if (opType->isIntegral()
- || isa<PointerType>(opType)
- || opType == Type::BoolTy)
+ if (opType->isIntegral() || isa<PointerType>(opType))
+ forwardOperandNum = 0; // forward first operand to user
+ else if (opType->isFloatingPoint())
{
- // These operand types have the same format as the destination,
- // but may have different size: add sign bits or mask as needed.
- //
- const Type* destType = destI->getType();
- unsigned opSize = target.DataLayout.getTypeSize(opType);
- unsigned destSize = target.DataLayout.getTypeSize(destType);
- if (opSize <= destSize && !opType->isSigned())
- { // operand is smaller than or same size as dest:
- // -- if operand is signed (checked above), nothing to do
- // -- if operand is unsigned, sign-extend the value:
- //
- target.getInstrInfo().CreateSignExtensionInstructions(target, destI->getParent()->getParent(), opVal, 8*opSize, destI, mvec, mcfi);
- }
- else if (opSize > destSize)
- { // operand is larger than dest: mask high bits using AND
- // and then sign-extend using SRA by 0!
- //
- TmpInstruction *tmpI = new TmpInstruction(destType, opVal,
- destI, "maskHi");
- mcfi.addTemp(tmpI);
- M = Create3OperandInstr(AND, opVal,
- ConstantUInt::get(Type::UIntTy,
- ((uint64_t) 1 << 8*destSize)-1),
- tmpI);
- mvec.push_back(M);
-
- target.getInstrInfo().CreateSignExtensionInstructions(target, destI->getParent()->getParent(), tmpI, 8*destSize, destI, mvec, mcfi);
- }
+ Instruction* destI = subtreeRoot->getInstruction();
+ CreateCodeToConvertFloatToInt(target, opVal, destI, mvec,
+ MachineCodeForInstruction::get(destI));
}
else
- {
- // If the source operand is an FP type, the int result must be
- // copied from float to int register via memory!
- Value* leftVal = subtreeRoot->leftChild()->getValue();
- Value* destForCast;
- vector<MachineInstr*> minstrVec;
-
- if (opType->isFloatingPoint())
- {
- // Create a temporary to represent the INT register
- // into which the FP value will be copied via memory.
- // The type of this temporary will determine the FP
- // register used: single-prec for a 32-bit int or smaller,
- // double-prec for a 64-bit int.
- //
- const Type* destTypeToUse =
- (destI->getType() == Type::LongTy)? Type::DoubleTy
- : Type::FloatTy;
- destForCast = new TmpInstruction(destTypeToUse, leftVal);
- MachineCodeForInstruction &destMCFI =
- MachineCodeForInstruction::get(destI);
- destMCFI.addTemp(destForCast);
-
- target.getInstrInfo().
- CreateCodeToCopyFloatToInt(target,
- destI->getParent()->getParent(),
- (TmpInstruction*) destForCast,
- destI, minstrVec, destMCFI);
- }
- else
- destForCast = leftVal;
-
- M = CreateConvertToIntInstr(subtreeRoot->getOpLabel(),
- leftVal, destForCast);
- mvec.push_back(M);
-
- // Append the copy code, if any, after the conversion instr.
- mvec.insert(mvec.end(), minstrVec.begin(), minstrVec.end());
- }
-
- if (oldMvecSize == mvec.size()) // no instruction was generated
- forwardOperandNum = 0; // forward first operand to user
-
+ assert(0 && "Unrecognized operand type for convert-to-signed");
break;
- }
+ }
case 31: // reg: ToFloatTy(reg):
case 32: // reg: ToDoubleTy(reg):
case 232: // reg: ToDoubleTy(Constant):
-
+
// If this instruction has a parent (a user) in the tree
// and the user is translated as an FsMULd instruction,
// then the cast is unnecessary. So check that first.
// In the future, we'll want to do the same for the FdMULq instruction,
// so do the check here instead of only for ToFloatTy(reg).
//
- if (subtreeRoot->parent() != NULL &&
- MachineCodeForInstruction::get(((InstructionNode*)subtreeRoot->parent())->getInstruction())[0]->getOpCode() == FSMULD)
+ if (subtreeRoot->parent() != NULL)
{
- forwardOperandNum = 0; // forward first operand to user
+ const MachineCodeForInstruction& mcfi =
+ MachineCodeForInstruction::get(
+ cast<InstructionNode>(subtreeRoot->parent())->getInstruction());
+ if (mcfi.size() == 0 || mcfi.front()->getOpCode() == FSMULD)
+ forwardOperandNum = 0; // forward first operand to user
}
- else
+
+ if (forwardOperandNum != 0) // we do need the cast
{
Value* leftVal = subtreeRoot->leftChild()->getValue();
const Type* opType = leftVal->getType();
// register used: single-prec for a 32-bit int or smaller,
// double-prec for a 64-bit int.
//
- const Type* srcTypeToUse =
- (leftVal->getType() == Type::LongTy)? Type::DoubleTy
- : Type::FloatTy;
-
- srcForCast = new TmpInstruction(srcTypeToUse, dest);
+ uint64_t srcSize =
+ target.DataLayout.getTypeSize(leftVal->getType());
+ Type* tmpTypeToUse =
+ (srcSize <= 4)? Type::FloatTy : Type::DoubleTy;
+ srcForCast = new TmpInstruction(tmpTypeToUse, dest);
MachineCodeForInstruction &destMCFI =
MachineCodeForInstruction::get(dest);
destMCFI.addTemp(srcForCast);
-
+
target.getInstrInfo().CreateCodeToCopyIntToFloat(target,
dest->getParent()->getParent(),
- leftVal, (TmpInstruction*) srcForCast,
+ leftVal, cast<Instruction>(srcForCast),
mvec, destMCFI);
}
else
srcForCast = leftVal;
-
+
M = new MachineInstr(opCode);
M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
srcForCast);
break;
case 233: // reg: Add(reg, Constant)
+ maskUnsignedResult = true;
M = CreateAddConstInstruction(subtreeRoot);
if (M != NULL)
{
// ELSE FALL THROUGH
case 33: // reg: Add(reg, reg)
+ maskUnsignedResult = true;
mvec.push_back(new MachineInstr(ChooseAddInstruction(subtreeRoot)));
Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
break;
case 234: // reg: Sub(reg, Constant)
+ maskUnsignedResult = true;
M = CreateSubConstInstruction(subtreeRoot);
if (M != NULL)
{
// ELSE FALL THROUGH
case 34: // reg: Sub(reg, reg)
+ maskUnsignedResult = true;
mvec.push_back(new MachineInstr(ChooseSubInstructionByType(
subtreeRoot->getInstruction()->getType())));
Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
case 35: // reg: Mul(reg, reg)
{
+ maskUnsignedResult = true;
MachineOpCode forceOp = ((checkCast && BothFloatToDouble(subtreeRoot))
? FSMULD
: INVALID_MACHINE_OPCODE);
case 235: // reg: Mul(reg, Constant)
{
+ maskUnsignedResult = true;
MachineOpCode forceOp = ((checkCast && BothFloatToDouble(subtreeRoot))
? FSMULD
: INVALID_MACHINE_OPCODE);
break;
}
case 236: // reg: Div(reg, Constant)
+ maskUnsignedResult = true;
L = mvec.size();
CreateDivConstInstruction(target, subtreeRoot, mvec);
if (mvec.size() > L)
// ELSE FALL THROUGH
case 36: // reg: Div(reg, reg)
+ maskUnsignedResult = true;
mvec.push_back(new MachineInstr(ChooseDivInstruction(target, subtreeRoot)));
Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
break;
case 37: // reg: Rem(reg, reg)
case 237: // reg: Rem(reg, Constant)
{
+ maskUnsignedResult = true;
Instruction* remInstr = subtreeRoot->getInstruction();
TmpInstruction* quot = new TmpInstruction(
M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,quot);
mvec.push_back(M);
- M = new MachineInstr(ChooseMulInstructionByType(
- subtreeRoot->getInstruction()->getType()));
- M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,quot);
- M->SetMachineOperandVal(1, MachineOperand::MO_VirtualRegister,
- subtreeRoot->rightChild()->getValue());
- M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,prod);
+ M = Create3OperandInstr(ChooseMulInstructionByType(
+ subtreeRoot->getInstruction()->getType()),
+ quot, subtreeRoot->rightChild()->getValue(),
+ prod);
mvec.push_back(M);
M = new MachineInstr(ChooseSubInstructionByType(
break;
case 138: // bool: And(bool, not)
- case 438: // bool: BAnd(bool, not)
- mvec.push_back(new MachineInstr(ANDN));
- Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
+ case 438: // bool: BAnd(bool, bnot)
+ { // Use the argument of NOT as the second argument!
+ // Mark the NOT node so that no code is generated for it.
+ InstructionNode* notNode = (InstructionNode*) subtreeRoot->rightChild();
+ Value* notArg = BinaryOperator::getNotArgument(
+ cast<BinaryOperator>(notNode->getInstruction()));
+ notNode->markFoldedIntoParent();
+ mvec.push_back(Create3OperandInstr(ANDN,
+ subtreeRoot->leftChild()->getValue(),
+ notArg, subtreeRoot->getValue()));
break;
+ }
case 39: // bool: Or(bool, bool)
case 239: // bool: Or(bool, boolconst)
break;
case 139: // bool: Or(bool, not)
- case 439: // bool: BOr(bool, not)
- mvec.push_back(new MachineInstr(ORN));
- Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
+ case 439: // bool: BOr(bool, bnot)
+ { // Use the argument of NOT as the second argument!
+ // Mark the NOT node so that no code is generated for it.
+ InstructionNode* notNode = (InstructionNode*) subtreeRoot->rightChild();
+ Value* notArg = BinaryOperator::getNotArgument(
+ cast<BinaryOperator>(notNode->getInstruction()));
+ notNode->markFoldedIntoParent();
+ mvec.push_back(Create3OperandInstr(ORN,
+ subtreeRoot->leftChild()->getValue(),
+ notArg, subtreeRoot->getValue()));
break;
+ }
case 40: // bool: Xor(bool, bool)
case 240: // bool: Xor(bool, boolconst)
break;
case 140: // bool: Xor(bool, not)
- case 440: // bool: BXor(bool, not)
- mvec.push_back(new MachineInstr(XNOR));
- Set3OperandsFromInstr(mvec.back(), subtreeRoot, target);
+ case 440: // bool: BXor(bool, bnot)
+ { // Use the argument of NOT as the second argument!
+ // Mark the NOT node so that no code is generated for it.
+ InstructionNode* notNode = (InstructionNode*) subtreeRoot->rightChild();
+ Value* notArg = BinaryOperator::getNotArgument(
+ cast<BinaryOperator>(notNode->getInstruction()));
+ notNode->markFoldedIntoParent();
+ mvec.push_back(Create3OperandInstr(XNOR,
+ subtreeRoot->leftChild()->getValue(),
+ notArg, subtreeRoot->getValue()));
break;
+ }
case 41: // boolconst: SetCC(reg, Constant)
//
break;
}
- case 43: // boolreg: VReg
- case 44: // boolreg: Constant
- break;
-
case 51: // reg: Load(reg)
case 52: // reg: Load(ptrreg)
- case 53: // reg: LoadIdx(reg,reg)
- case 54: // reg: LoadIdx(ptrreg,reg)
mvec.push_back(new MachineInstr(ChooseLoadInstruction(
subtreeRoot->getValue()->getType())));
- SetOperandsForMemInstr(mvec, mvec.end()-1, subtreeRoot, target);
+ SetOperandsForMemInstr(mvec, subtreeRoot, target);
break;
case 55: // reg: GetElemPtr(reg)
// If the GetElemPtr was folded into the user (parent), it will be
// caught above. For other cases, we have to compute the address.
mvec.push_back(new MachineInstr(ADD));
- SetOperandsForMemInstr(mvec, mvec.end()-1, subtreeRoot, target);
+ SetOperandsForMemInstr(mvec, subtreeRoot, target);
break;
-
+
case 57: // reg: Alloca: Implement as 1 instruction:
{ // add %fp, offsetFromFP -> result
AllocationInst* instr =
cast<AllocationInst>(subtreeRoot->getInstruction());
unsigned int tsize =
- target.findOptimalStorageSize(instr->getAllocatedType());
+ target.DataLayout.getTypeSize(instr->getAllocatedType());
assert(tsize != 0);
CreateCodeForFixedSizeAlloca(target, instr, tsize, 1, mvec);
break;
}
-
+
case 58: // reg: Alloca(reg): Implement as 3 instructions:
// mul num, typeSz -> tmp
// sub %sp, tmp -> %sp
const Type* eltType = instr->getAllocatedType();
// If #elements is constant, use simpler code for fixed-size allocas
- int tsize = (int) target.findOptimalStorageSize(eltType);
+ int tsize = (int) target.DataLayout.getTypeSize(eltType);
Value* numElementsVal = NULL;
bool isArray = instr->isArrayAllocation();
numElementsVal, mvec);
break;
}
-
+
case 61: // reg: Call
- { // Generate a direct (CALL) or indirect (JMPL). depending
- // Mark the return-address register and the indirection
- // register (if any) as hidden virtual registers.
- // Also, mark the operands of the Call and return value (if
- // any) as implicit operands of the CALL machine instruction.
+ { // Generate a direct (CALL) or indirect (JMPL) call.
+ // Mark the return-address register, the indirection
+ // register (for indirect calls), the operands of the Call,
+ // and the return value (if any) as implicit operands
+ // of the machine instruction.
//
// If this is a varargs function, floating point arguments
// have to passed in integer registers so insert
//
CallInst *callInstr = cast<CallInst>(subtreeRoot->getInstruction());
Value *callee = callInstr->getCalledValue();
-
- // Create hidden virtual register for return address, with type void*.
+
+ // Create hidden virtual register for return address with type void*
TmpInstruction* retAddrReg =
new TmpInstruction(PointerType::get(Type::VoidTy), callInstr);
MachineCodeForInstruction::get(callInstr).addTemp(retAddrReg);
-
+
// Generate the machine instruction and its operands.
// Use CALL for direct function calls; this optimistically assumes
// the PC-relative address fits in the CALL address field (22 bits).
// Use JMPL for indirect calls.
//
- if (isa<Function>(callee))
- { // direct function call
- M = new MachineInstr(CALL);
- M->SetMachineOperandVal(0, MachineOperand::MO_PCRelativeDisp,
- callee);
- }
- else
- { // indirect function call
- M = new MachineInstr(JMPLCALL);
- M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
- callee);
- M->SetMachineOperandConst(1, MachineOperand::MO_SignExtendedImmed,
- (int64_t) 0);
- M->SetMachineOperandVal(2, MachineOperand::MO_VirtualRegister,
- retAddrReg);
- }
-
+ if (isa<Function>(callee)) // direct function call
+ M = Create1OperandInstr_Addr(CALL, callee);
+ else // indirect function call
+ M = Create3OperandInstr_SImmed(JMPLCALL, callee,
+ (int64_t) 0, retAddrReg);
mvec.push_back(M);
const FunctionType* funcType =
// If this arg. is in the first $K$ regs, add a copy
// float-to-int instruction to pass the value as an integer.
- if (i < target.getRegInfo().GetNumOfIntArgRegs())
+ if (i <= target.getRegInfo().GetNumOfIntArgRegs())
{
MachineCodeForInstruction &destMCFI =
MachineCodeForInstruction::get(callInstr);
Instruction* shlInstr = subtreeRoot->getInstruction();
const Type* opType = argVal1->getType();
- assert(opType->isIntegral()
- || opType == Type::BoolTy
- || isa<PointerType>(opType)&&"Shl unsupported for other types");
+ assert((opType->isInteger() || isa<PointerType>(opType)) &&
+ "Shl unsupported for other types");
CreateShiftInstructions(target, shlInstr->getParent()->getParent(),
(opType == Type::LongTy)? SLLX : SLL,
case 63: // reg: Shr(reg, reg)
{ const Type* opType = subtreeRoot->leftChild()->getValue()->getType();
- assert(opType->isIntegral()
- || isa<PointerType>(opType)&&"Shr unsupported for other types");
+ assert((opType->isInteger() || isa<PointerType>(opType)) &&
+ "Shr unsupported for other types");
mvec.push_back(new MachineInstr((opType->isSigned()
? ((opType == Type::LongTy)? SRAX : SRA)
: ((opType == Type::LongTy)? SRLX : SRL))));
case 64: // reg: Phi(reg,reg)
break; // don't forward the value
-#undef NEED_PHI_MACHINE_INSTRS
-#ifdef NEED_PHI_MACHINE_INSTRS
- { // This instruction has variable #operands, so resultPos is 0.
- Instruction* phi = subtreeRoot->getInstruction();
- M = new MachineInstr(PHI, 1 + phi->getNumOperands());
- M->SetMachineOperandVal(0, MachineOperand::MO_VirtualRegister,
- subtreeRoot->getValue());
- for (unsigned i=0, N=phi->getNumOperands(); i < N; i++)
- M->SetMachineOperandVal(i+1, MachineOperand::MO_VirtualRegister,
- phi->getOperand(i));
- mvec.push_back(M);
- break;
- }
-#endif // NEED_PHI_MACHINE_INSTRS
-
-
case 71: // reg: VReg
case 72: // reg: Constant
break; // don't forward the value
break;
}
}
-
+
if (forwardOperandNum >= 0)
{ // We did not generate a machine instruction but need to use operand.
// If user is in the same tree, replace Value in its machine operand.
mvec.insert(mvec.end(), minstrVec.begin(), minstrVec.end());
}
}
+
+ if (maskUnsignedResult)
+ { // If result is unsigned and smaller than int reg size,
+ // we need to clear high bits of result value.
+ assert(forwardOperandNum < 0 && "Need mask but no instruction generated");
+ Instruction* dest = subtreeRoot->getInstruction();
+ if (dest->getType()->isUnsigned())
+ {
+ unsigned destSize = target.DataLayout.getTypeSize(dest->getType());
+ if (destSize <= 4)
+ { // Mask high bits. Use a TmpInstruction to represent the
+ // intermediate result before masking. Since those instructions
+ // have already been generated, go back and substitute tmpI
+ // for dest in the result position of each one of them.
+ TmpInstruction *tmpI = new TmpInstruction(dest->getType(), dest,
+ NULL, "maskHi");
+ MachineCodeForInstruction::get(dest).addTemp(tmpI);
+
+ for (unsigned i=0, N=mvec.size(); i < N; ++i)
+ mvec[i]->substituteValue(dest, tmpI);
+
+ M = Create3OperandInstr_UImmed(SRL, tmpI, 8*(4-destSize), dest);
+ mvec.push_back(M);
+ }
+ else if (destSize < target.DataLayout.getIntegerRegize())
+ assert(0 && "Unsupported type size: 32 < size < 64 bits");
+ }
+ }
}
projects / oota-llvm.git / blobdiff