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//===-- llvm/CodeGen/InstrSelectionSupport.h --------------------*- C++ -*-===//
//
// Target-independent instruction selection code. See SparcInstrSelection.cpp
// for usage.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_INSTR_SELECTION_SUPPORT_H
#define LLVM_CODEGEN_INSTR_SELECTION_SUPPORT_H
#include "llvm/CodeGen/MachineInstr.h"
#include "Support/DataTypes.h"
class InstructionNode;
class TargetMachine;
class Instruction;
//---------------------------------------------------------------------------
// Function GetConstantValueAsUnsignedInt
// Function GetConstantValueAsSignedInt
//
// Convenience functions to get the value of an integer 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);
int64_t GetConstantValueAsSignedInt (const Value *V,
bool &isValidConstant);
//---------------------------------------------------------------------------
// 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,
std::vector<Value*>& idxVec,
bool& allConstantIndices);
//------------------------------------------------------------------------
// Function Set2OperandsFromInstr
// Function Set3OperandsFromInstr
//
// Purpose:
//
// For the common case of 2- and 3-operand arithmetic/logical instructions,
// set the m/c instr. operands directly from the VM instruction's operands.
// Check whether the first or second operand is 0 and can use a dedicated
// "0" register.
// Check whether the second operand should use an immediate field or register.
// (First and third operands are never immediates for such instructions.)
//
// Arguments:
// canDiscardResult: Specifies that the result operand can be discarded
// by using the dedicated "0"
//
// op1position, op2position and resultPosition: Specify in which position
// in the machine instruction the 3 operands (arg1, arg2
// and result) should go.
//
// RETURN VALUE: unsigned flags, where
// flags & 0x01 => operand 1 is constant and needs a register
// flags & 0x02 => operand 2 is constant and needs a register
//------------------------------------------------------------------------
void Set2OperandsFromInstr (MachineInstr* minstr,
InstructionNode* vmInstrNode,
const TargetMachine& targetMachine,
bool canDiscardResult = false,
int op1Position = 0,
int resultPosition = 1);
void Set3OperandsFromInstr (MachineInstr* minstr,
InstructionNode* vmInstrNode,
const TargetMachine& targetMachine,
bool canDiscardResult = false,
int op1Position = 0,
int op2Position = 1,
int resultPosition = 2);
//---------------------------------------------------------------------------
// Function: ChooseRegOrImmed
//
// Purpose:
//
//---------------------------------------------------------------------------
MachineOperand::MachineOperandType ChooseRegOrImmed(
Value* val,
MachineOpCode opCode,
const TargetMachine& targetMachine,
bool canUseImmed,
unsigned& getMachineRegNum,
int64_t& getImmedValue);
MachineOperand::MachineOperandType ChooseRegOrImmed(int64_t intValue,
bool isSigned,
MachineOpCode opCode,
const TargetMachine& target,
bool canUseImmed,
unsigned& getMachineRegNum,
int64_t& getImmedValue);
//---------------------------------------------------------------------------
// Function: FixConstantOperandsForInstr
//
// Purpose:
// Special handling for constant operands of a machine instruction
// -- if the constant is 0, use the hardwired 0 register, if any;
// -- if the constant fits in the IMMEDIATE field, use that field;
// -- else create instructions to put the constant into a register, either
// directly or by loading explicitly from the constant pool.
//
// In the first 2 cases, the operand of `minstr' is modified in place.
// Returns a vector of machine instructions generated for operands that
// fall under case 3; these must be inserted before `minstr'.
//---------------------------------------------------------------------------
std::vector<MachineInstr*> FixConstantOperandsForInstr (Instruction* vmInstr,
MachineInstr* minstr,
TargetMachine& target);
#endif
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