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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4372 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
2.0 KiB
C++
56 lines
2.0 KiB
C++
//===-- TargetMachine.cpp - General Target Information ---------------------==//
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//
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// This file describes the general parts of a Target machine.
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// This file also implements MachineInstrInfo and MachineCacheInfo.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/MachineInstrInfo.h"
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#include "llvm/Constant.h"
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#include "llvm/DerivedTypes.h"
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//---------------------------------------------------------------------------
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// class MachineInstructionInfo
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// Interface to description of machine instructions
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//---------------------------------------------------------------------------
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MachineInstrInfo::MachineInstrInfo(const MachineInstrDescriptor* Desc,
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unsigned DescSize,
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unsigned NumRealOpCodes)
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: desc(Desc), descSize(DescSize), numRealOpCodes(NumRealOpCodes) {
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// FIXME: TargetInstrDescriptors should not be global
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assert(TargetInstrDescriptors == NULL && desc != NULL);
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TargetInstrDescriptors = desc; // initialize global variable
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}
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MachineInstrInfo::~MachineInstrInfo() {
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TargetInstrDescriptors = NULL; // reset global variable
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}
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bool MachineInstrInfo::constantFitsInImmedField(MachineOpCode opCode,
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int64_t intValue) const {
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// First, check if opCode has an immed field.
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bool isSignExtended;
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uint64_t maxImmedValue = maxImmedConstant(opCode, isSignExtended);
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if (maxImmedValue != 0)
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{
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// NEED TO HANDLE UNSIGNED VALUES SINCE THEY MAY BECOME MUCH
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// SMALLER AFTER CASTING TO SIGN-EXTENDED int, short, or char.
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// See CreateUIntSetInstruction in SparcInstrInfo.cpp.
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// Now check if the constant fits
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if (intValue <= (int64_t) maxImmedValue &&
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intValue >= -((int64_t) maxImmedValue+1))
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return true;
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}
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return false;
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}
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bool MachineInstrInfo::ConstantTypeMustBeLoaded(const Constant* CV) const {
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assert(CV->getType()->isPrimitiveType() || isa<PointerType>(CV->getType()));
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return !(CV->getType()->isIntegral() || isa<PointerType>(CV->getType()));
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}
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