C++ Triple::isArch32Bit方法代码示例

static std::string computeDataLayout(const Triple &TT) {
  if (TT.isArch64Bit()) {
    return "e-m:e-i64:64-n32:64-S128";
  } else {
    assert(TT.isArch32Bit() && "only RV32 and RV64 are currently supported");
    return "e-m:e-p:32:32-i64:64-n32-S128";
  }
}

bool PPCCTRLoops::convertToCTRLoop(Loop *L) {
  bool MadeChange = false;

  Triple TT = Triple(L->getHeader()->getParent()->getParent()->
                     getTargetTriple());
  if (!TT.isArch32Bit() && !TT.isArch64Bit())
    return MadeChange; // Unknown arch. type.

  // Process nested loops first.
  for (Loop::iterator I = L->begin(), E = L->end(); I != E; ++I) {
    MadeChange |= convertToCTRLoop(*I);
  }

  // If a nested loop has been converted, then we can't convert this loop.
  if (MadeChange)
    return MadeChange;

#ifndef NDEBUG
  // Stop trying after reaching the limit (if any).
  int Limit = CTRLoopLimit;
  if (Limit >= 0) {
    if (Counter >= CTRLoopLimit)
      return false;
    Counter++;
  }
#endif

  // We don't want to spill/restore the counter register, and so we don't
  // want to use the counter register if the loop contains calls.
  for (Loop::block_iterator I = L->block_begin(), IE = L->block_end();
       I != IE; ++I)
    if (mightUseCTR(TT, *I))
      return MadeChange;

  SmallVector<BasicBlock*, 4> ExitingBlocks;
  L->getExitingBlocks(ExitingBlocks);

  BasicBlock *CountedExitBlock = 0;
  const SCEV *ExitCount = 0;
  BranchInst *CountedExitBranch = 0;
  for (SmallVectorImpl<BasicBlock *>::iterator I = ExitingBlocks.begin(),
       IE = ExitingBlocks.end(); I != IE; ++I) {
    const SCEV *EC = SE->getExitCount(L, *I);
    DEBUG(dbgs() << "Exit Count for " << *L << " from block " <<
                    (*I)->getName() << ": " << *EC << "\n");
    if (isa<SCEVCouldNotCompute>(EC))
      continue;
    if (const SCEVConstant *ConstEC = dyn_cast<SCEVConstant>(EC)) {
      if (ConstEC->getValue()->isZero())
        continue;
    } else if (!SE->isLoopInvariant(EC, L))
      continue;

    if (SE->getTypeSizeInBits(EC->getType()) > (TT.isArch64Bit() ? 64 : 32))
      continue;

    // We now have a loop-invariant count of loop iterations (which is not the
    // constant zero) for which we know that this loop will not exit via this
    // exisiting block.

    // We need to make sure that this block will run on every loop iteration.
    // For this to be true, we must dominate all blocks with backedges. Such
    // blocks are in-loop predecessors to the header block.
    bool NotAlways = false;
    for (pred_iterator PI = pred_begin(L->getHeader()),
         PIE = pred_end(L->getHeader()); PI != PIE; ++PI) {
      if (!L->contains(*PI))
        continue;

      if (!DT->dominates(*I, *PI)) {
        NotAlways = true;
        break;
      }
    }

    if (NotAlways)
      continue;

    // Make sure this blocks ends with a conditional branch.
    Instruction *TI = (*I)->getTerminator();
    if (!TI)
      continue;

    if (BranchInst *BI = dyn_cast<BranchInst>(TI)) {
      if (!BI->isConditional())
        continue;

      CountedExitBranch = BI;
    } else
      continue;

    // Note that this block may not be the loop latch block, even if the loop
    // has a latch block.
    CountedExitBlock = *I;
    ExitCount = EC;
    break;
  }

  if (!CountedExitBlock)
    return MadeChange;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
            return true;

          // Conversion happens only for FP calls.
          if (!CI->getArgOperand(0)->getType()->isFloatingPointTy())
            return true;

          switch (Func) {
          default: return true;
          case LibFunc::copysign:
          case LibFunc::copysignf:
            continue; // ISD::FCOPYSIGN is never a library call.
          case LibFunc::copysignl:
            return true;
          case LibFunc::fabs:
          case LibFunc::fabsf:
          case LibFunc::fabsl:
            continue; // ISD::FABS is never a library call.
          case LibFunc::sqrt:
          case LibFunc::sqrtf:
          case LibFunc::sqrtl:
            Opcode = ISD::FSQRT; break;
          case LibFunc::floor:
          case LibFunc::floorf:
          case LibFunc::floorl:
            Opcode = ISD::FFLOOR; break;
          case LibFunc::nearbyint:
          case LibFunc::nearbyintf:
          case LibFunc::nearbyintl:
            Opcode = ISD::FNEARBYINT; break;
          case LibFunc::ceil:
          case LibFunc::ceilf:
          case LibFunc::ceill:
            Opcode = ISD::FCEIL; break;
          case LibFunc::rint:
          case LibFunc::rintf:
          case LibFunc::rintl:
            Opcode = ISD::FRINT; break;
          case LibFunc::round:
          case LibFunc::roundf:
          case LibFunc::roundl:
            Opcode = ISD::FROUND; break;
          case LibFunc::trunc:
          case LibFunc::truncf:
          case LibFunc::truncl:
            Opcode = ISD::FTRUNC; break;
          }

          MVT VTy =
            TLI->getSimpleValueType(CI->getArgOperand(0)->getType(), true);
          if (VTy == MVT::Other)
            return true;
          
          if (TLI->isOperationLegalOrCustom(Opcode, VTy))
            continue;
          else if (VTy.isVector() &&
                   TLI->isOperationLegalOrCustom(Opcode, VTy.getScalarType()))
            continue;

          return true;
        }
      }

      return true;
    } else if (isa<BinaryOperator>(J) &&
               J->getType()->getScalarType()->isPPC_FP128Ty()) {
      // Most operations on ppc_f128 values become calls.
      return true;
    } else if (isa<UIToFPInst>(J) || isa<SIToFPInst>(J) ||
               isa<FPToUIInst>(J) || isa<FPToSIInst>(J)) {
      CastInst *CI = cast<CastInst>(J);
      if (CI->getSrcTy()->getScalarType()->isPPC_FP128Ty() ||
          CI->getDestTy()->getScalarType()->isPPC_FP128Ty() ||
          (TT.isArch32Bit() &&
           (CI->getSrcTy()->getScalarType()->isIntegerTy(64) ||
            CI->getDestTy()->getScalarType()->isIntegerTy(64))
          ))
        return true;
    } else if (TT.isArch32Bit() &&
               J->getType()->getScalarType()->isIntegerTy(64) &&
               (J->getOpcode() == Instruction::UDiv ||
                J->getOpcode() == Instruction::SDiv ||
                J->getOpcode() == Instruction::URem ||
                J->getOpcode() == Instruction::SRem)) {
      return true;
    } else if (isa<IndirectBrInst>(J) || isa<InvokeInst>(J)) {
      // On PowerPC, indirect jumps use the counter register.
      return true;
    } else if (SwitchInst *SI = dyn_cast<SwitchInst>(J)) {
      if (!TM)
        return true;
      const TargetLowering *TLI = TM->getTargetLowering();

      if (TLI->supportJumpTables() &&
          SI->getNumCases()+1 >= (unsigned) TLI->getMinimumJumpTableEntries())
        return true;
    }
  }

  return false;
}