bool selectRet(const Instruction *I);
bool selectTrunc(const Instruction *I);
bool selectIntExt(const Instruction *I);
- bool selectShift(const Instruction *I);
// Utility helper routines.
bool isTypeLegal(Type *Ty, MVT &VT);
return Success ? DestReg : 0;
}
-bool MipsFastISel::selectShift(const Instruction *I) {
- MVT RetVT;
-
- if (!isTypeSupported(I->getType(), RetVT))
- return false;
-
- unsigned ResultReg = createResultReg(&Mips::GPR32RegClass);
- if (!ResultReg)
- return false;
-
- unsigned Opcode = I->getOpcode();
- const Value *Op0 = I->getOperand(0);
- unsigned Op0Reg = getRegForValue(Op0);
- if (!Op0Reg)
- return false;
-
- // If AShr or LShr, then we need to make sure the operand0 is sign extended.
- if (Opcode == Instruction::AShr || Opcode == Instruction::LShr) {
- unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
- if (!TempReg)
- return false;
-
- MVT Op0MVT = TLI.getValueType(Op0->getType(), true).getSimpleVT();
- bool IsZExt = Opcode == Instruction::LShr;
- if (!emitIntExt(Op0MVT, Op0Reg, MVT::i32, TempReg, IsZExt))
- return false;
-
- Op0Reg = TempReg;
- }
-
- if (const auto *C = dyn_cast<ConstantInt>(I->getOperand(1))) {
- uint64_t ShiftVal = C->getZExtValue();
-
- switch (Opcode) {
- default:
- llvm_unreachable("Unexpected instruction.");
- case Instruction::Shl:
- Opcode = Mips::SLL;
- break;
- case Instruction::AShr:
- Opcode = Mips::SRA;
- break;
- case Instruction::LShr:
- Opcode = Mips::SRL;
- break;
- }
-
- emitInst(Opcode, ResultReg).addReg(Op0Reg).addImm(ShiftVal);
- updateValueMap(I, ResultReg);
- return true;
- }
-
- unsigned Op1Reg = getRegForValue(I->getOperand(1));
- if (!Op1Reg)
- return false;
-
- switch (Opcode) {
- default:
- llvm_unreachable("Unexpected instruction.");
- case Instruction::Shl:
- Opcode = Mips::SLLV;
- break;
- case Instruction::AShr:
- Opcode = Mips::SRAV;
- break;
- case Instruction::LShr:
- Opcode = Mips::SRLV;
- break;
- }
-
- emitInst(Opcode, ResultReg).addReg(Op0Reg).addReg(Op1Reg);
- updateValueMap(I, ResultReg);
- return true;
-}
-
bool MipsFastISel::fastSelectInstruction(const Instruction *I) {
if (!TargetSupported)
return false;
return selectLoad(I);
case Instruction::Store:
return selectStore(I);
- case Instruction::Shl:
- case Instruction::LShr:
- case Instruction::AShr:
- return selectShift(I);
case Instruction::And:
case Instruction::Or:
case Instruction::Xor: