1 //===-- MachineInstrInfo.cpp - Target Instruction Information -------------===//
4 //===----------------------------------------------------------------------===//
6 #include "llvm/Target/MachineInstrInfo.h"
7 #include "llvm/CodeGen/MachineInstr.h"
8 #include "llvm/Constant.h"
9 #include "llvm/DerivedTypes.h"
11 // External object describing the machine instructions
12 // Initialized only when the TargetMachine class is created
13 // and reset when that class is destroyed.
15 const MachineInstrDescriptor* TargetInstrDescriptors = 0;
17 //---------------------------------------------------------------------------
18 // class MachineInstructionInfo
19 // Interface to description of machine instructions
20 //---------------------------------------------------------------------------
23 MachineInstrInfo::MachineInstrInfo(const MachineInstrDescriptor* Desc,
25 unsigned NumRealOpCodes)
26 : desc(Desc), descSize(DescSize), numRealOpCodes(NumRealOpCodes) {
27 // FIXME: TargetInstrDescriptors should not be global
28 assert(TargetInstrDescriptors == NULL && desc != NULL);
29 TargetInstrDescriptors = desc; // initialize global variable
32 MachineInstrInfo::~MachineInstrInfo() {
33 TargetInstrDescriptors = NULL; // reset global variable
36 void MachineInstrInfo::print(const MachineInstr *MI, std::ostream &O,
37 const TargetMachine &TM) const {
41 bool MachineInstrInfo::constantFitsInImmedField(MachineOpCode opCode,
42 int64_t intValue) const {
43 // First, check if opCode has an immed field.
45 uint64_t maxImmedValue = maxImmedConstant(opCode, isSignExtended);
46 if (maxImmedValue != 0)
48 // NEED TO HANDLE UNSIGNED VALUES SINCE THEY MAY BECOME MUCH
49 // SMALLER AFTER CASTING TO SIGN-EXTENDED int, short, or char.
50 // See CreateUIntSetInstruction in SparcInstrInfo.cpp.
52 // Now check if the constant fits
53 if (intValue <= (int64_t) maxImmedValue &&
54 intValue >= -((int64_t) maxImmedValue+1))
61 bool MachineInstrInfo::ConstantTypeMustBeLoaded(const Constant* CV) const {
62 assert(CV->getType()->isPrimitiveType() || isa<PointerType>(CV->getType()));
63 return !(CV->getType()->isIntegral() || isa<PointerType>(CV->getType()));