mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-13 23:18:51 +00:00
7847fcac17
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21452 91177308-0d34-0410-b5e6-96231b3b80d8
73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
//===-- TargetInstrInfo.cpp - Target Instruction Information --------------===//
|
|
//
|
|
// 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the TargetInstrInfo class.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Target/TargetInstrInfo.h"
|
|
#include "llvm/CodeGen/MachineInstr.h"
|
|
#include "llvm/Constant.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
using namespace llvm;
|
|
|
|
namespace llvm {
|
|
// External object describing the machine instructions Initialized only when
|
|
// the TargetMachine class is created and reset when that class is destroyed.
|
|
//
|
|
// FIXME: UGLY SPARCV9 HACK!
|
|
const TargetInstrDescriptor* TargetInstrDescriptors = 0;
|
|
}
|
|
|
|
TargetInstrInfo::TargetInstrInfo(const TargetInstrDescriptor* Desc,
|
|
unsigned numOpcodes)
|
|
: desc(Desc), NumOpcodes(numOpcodes) {
|
|
// FIXME: TargetInstrDescriptors should not be global
|
|
assert(TargetInstrDescriptors == NULL && desc != NULL
|
|
&& "TargetMachine data structure corrupt; maybe you tried to create another TargetMachine? (only one may exist in a program)");
|
|
TargetInstrDescriptors = desc; // initialize global variable
|
|
}
|
|
|
|
TargetInstrInfo::~TargetInstrInfo() {
|
|
TargetInstrDescriptors = NULL; // reset global variable
|
|
}
|
|
|
|
// FIXME: SPARCV9 SPECIFIC!
|
|
bool TargetInstrInfo::constantFitsInImmedField(MachineOpCode opCode,
|
|
int64_t intValue) const {
|
|
// First, check if opCode has an immed field.
|
|
bool isSignExtended;
|
|
uint64_t maxImmedValue = maxImmedConstant(opCode, isSignExtended);
|
|
if (maxImmedValue != 0)
|
|
{
|
|
// NEED TO HANDLE UNSIGNED VALUES SINCE THEY MAY BECOME MUCH
|
|
// SMALLER AFTER CASTING TO SIGN-EXTENDED int, short, or char.
|
|
// See CreateUIntSetInstruction in SparcInstrInfo.cpp.
|
|
|
|
// Now check if the constant fits
|
|
if (intValue <= (int64_t) maxImmedValue &&
|
|
intValue >= -((int64_t) maxImmedValue+1))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
// commuteInstruction - The default implementation of this method just exchanges
|
|
// operand 1 and 2.
|
|
MachineInstr *TargetInstrInfo::commuteInstruction(MachineInstr *MI) const {
|
|
assert(MI->getOperand(1).isRegister() && MI->getOperand(2).isRegister() &&
|
|
"This only knows how to commute register operands so far");
|
|
unsigned Reg1 = MI->getOperand(1).getReg();
|
|
unsigned Reg2 = MI->getOperand(1).getReg();
|
|
MI->SetMachineOperandReg(2, Reg1);
|
|
MI->SetMachineOperandReg(1, Reg2);
|
|
return MI;
|
|
}
|