//===-- 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/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.
-//
-const TargetInstrDescriptor* TargetInstrDescriptors = 0;
-
+ // 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 DescSize,
- unsigned NumRealOpCodes)
- : desc(Desc), descSize(DescSize), numRealOpCodes(NumRealOpCodes) {
+ unsigned numOpcodes)
+ : desc(Desc), NumOpcodes(numOpcodes) {
// FIXME: TargetInstrDescriptors should not be global
- assert(TargetInstrDescriptors == NULL && desc != NULL);
- TargetInstrDescriptors = desc; // initialize global variable
+ 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
+ TargetInstrDescriptors = NULL; // reset global variable
}
-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;
+/// findTiedToSrcOperand - Returns the operand that is tied to the specified
+/// dest operand. Returns -1 if there isn't one.
+int
+TargetInstrInfo::findTiedToSrcOperand(MachineOpCode Opc, unsigned OpNum) const {
+ for (unsigned i = 0, e = getNumOperands(Opc); i != e; ++i) {
+ if (i == OpNum)
+ continue;
+ int ti = getOperandConstraint(Opc, i, TIED_TO);
+ if (ti == (int)OpNum)
+ return i;
+ }
+ return -1;
}
-bool TargetInstrInfo::ConstantTypeMustBeLoaded(const Constant* CV) const {
- assert(CV->getType()->isPrimitiveType() || isa<PointerType>(CV->getType()));
- return !(CV->getType()->isIntegral() || isa<PointerType>(CV->getType()));
-}
-} // End llvm namespace
+// 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(2).getReg();
+ bool Reg1IsKill = MI->getOperand(1).isKill();
+ bool Reg2IsKill = MI->getOperand(2).isKill();
+ MI->getOperand(2).setReg(Reg1);
+ MI->getOperand(1).setReg(Reg2);
+ if (Reg1IsKill)
+ MI->getOperand(2).setIsKill();
+ else
+ MI->getOperand(2).unsetIsKill();
+ if (Reg2IsKill)
+ MI->getOperand(1).setIsKill();
+ else
+ MI->getOperand(1).unsetIsKill();
+ return MI;
+}