C++ IRBuilder::CreateAnd方法代码示例

Optional<Value *> LoopPredication::widenICmpRangeCheckDecrementingLoop(
    LoopPredication::LoopICmp LatchCheck, LoopPredication::LoopICmp RangeCheck,
    SCEVExpander &Expander, IRBuilder<> &Builder) {
  auto *Ty = RangeCheck.IV->getType();
  const SCEV *GuardStart = RangeCheck.IV->getStart();
  const SCEV *GuardLimit = RangeCheck.Limit;
  const SCEV *LatchLimit = LatchCheck.Limit;
  if (!CanExpand(GuardStart) || !CanExpand(GuardLimit) ||
      !CanExpand(LatchLimit)) {
    LLVM_DEBUG(dbgs() << "Can't expand limit check!\n");
    return None;
  }
  // The decrement of the latch check IV should be the same as the
  // rangeCheckIV.
  auto *PostDecLatchCheckIV = LatchCheck.IV->getPostIncExpr(*SE);
  if (RangeCheck.IV != PostDecLatchCheckIV) {
    LLVM_DEBUG(dbgs() << "Not the same. PostDecLatchCheckIV: "
                      << *PostDecLatchCheckIV
                      << "  and RangeCheckIV: " << *RangeCheck.IV << "\n");
    return None;
  }

  // Generate the widened condition for CountDownLoop:
  // guardStart u< guardLimit &&
  // latchLimit <pred> 1.
  // See the header comment for reasoning of the checks.
  Instruction *InsertAt = Preheader->getTerminator();
  auto LimitCheckPred =
      ICmpInst::getFlippedStrictnessPredicate(LatchCheck.Pred);
  auto *FirstIterationCheck = expandCheck(Expander, Builder, ICmpInst::ICMP_ULT,
                                          GuardStart, GuardLimit, InsertAt);
  auto *LimitCheck = expandCheck(Expander, Builder, LimitCheckPred, LatchLimit,
                                 SE->getOne(Ty), InsertAt);
  return Builder.CreateAnd(FirstIterationCheck, LimitCheck);
}

Value* AndExpression::getValue() {
    assert(leftExpression != NULL);
    assert(rightExpression != NULL);

    IRBuilder<>* builder = codegen::getBuilder();
    return builder->CreateAnd(leftExpression->getValue(), rightExpression->getValue());
}

void MmixLlvm::Private::emitAndnl(VerticeContext& vctx, IRBuilder<>& builder,  MXByte xarg, MXWyde yzarg)
{
	Value* result = builder.CreateAnd(vctx.getRegister( xarg), builder.getInt64((MXOcta) yzarg));
	assignRegister(vctx, builder, xarg, result);
	builder.CreateBr(vctx.getOCExit());
}

//.........这里部分代码省略.........
    if (Preds.count(PS) == 0) {
      // Case 2.
      LastCondBlock = Pred;
    } else {
      // Case 1
      BranchInst *BPS = dyn_cast<BranchInst>(PS->getTerminator());
      if (BPS && BPS->isUnconditional()) {
        // Case 1: PS(BB3) should be an unconditional branch.
        LastCondBlock = Pred;
      }
    }
  }

  if (!FirstCondBlock || !LastCondBlock || (FirstCondBlock == LastCondBlock))
    return false;

  TerminatorInst *TBB = LastCondBlock->getTerminator();
  BasicBlock *PS1 = TBB->getSuccessor(0);
  BasicBlock *PS2 = TBB->getSuccessor(1);
  BranchInst *PBI1 = dyn_cast<BranchInst>(PS1->getTerminator());
  BranchInst *PBI2 = dyn_cast<BranchInst>(PS2->getTerminator());

  // If PS1 does not jump into PS2, but PS2 jumps into PS1,
  // attempt branch inversion.
  if (!PBI1 || !PBI1->isUnconditional() ||
      (PS1->getTerminator()->getSuccessor(0) != PS2)) {
    // Check whether PS2 jumps into PS1.
    if (!PBI2 || !PBI2->isUnconditional() ||
        (PS2->getTerminator()->getSuccessor(0) != PS1))
      return false;

    // Do branch inversion.
    BasicBlock *CurrBlock = LastCondBlock;
    bool EverChanged = false;
    while (1) {
      BranchInst *BI = dyn_cast<BranchInst>(CurrBlock->getTerminator());
      CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition());
      CmpInst::Predicate Predicate = CI->getPredicate();
      // Cannonicalize icmp_ne -> icmp_eq, fcmp_one -> fcmp_oeq
      if ((Predicate == CmpInst::ICMP_NE) || (Predicate == CmpInst::FCMP_ONE)) {
        CI->setPredicate(ICmpInst::getInversePredicate(Predicate));
        BI->swapSuccessors();
        EverChanged = true;
      }
      if (CurrBlock == FirstCondBlock)
        break;
      CurrBlock = CurrBlock->getSinglePredecessor();
    }
    return EverChanged;
  }

  // PS1 must have a conditional branch.
  if (!PBI1 || !PBI1->isUnconditional())
    return false;

  // PS2 should not contain PHI node.
  PHI = dyn_cast<PHINode>(PS2->begin());
  if (PHI)
    return false;

  // Do the transformation.
  BasicBlock *CB;
  BranchInst *PBI = dyn_cast<BranchInst>(FirstCondBlock->getTerminator());
  bool Iteration = true;
  BasicBlock *SaveInsertBB = Builder.GetInsertBlock();
  BasicBlock::iterator SaveInsertPt = Builder.GetInsertPoint();
  Value *PC = PBI->getCondition();

  do {
    CB = PBI->getSuccessor(1 - Idx);
    // Delete the conditional branch.
    FirstCondBlock->getInstList().pop_back();
    FirstCondBlock->getInstList()
        .splice(FirstCondBlock->end(), CB->getInstList());
    PBI = cast<BranchInst>(FirstCondBlock->getTerminator());
    Value *CC = PBI->getCondition();
    // Merge conditions.
    Builder.SetInsertPoint(PBI);
    Value *NC;
    if (Idx == 0)
      // Case 2, use parallel or.
      NC = Builder.CreateOr(PC, CC);
    else
      // Case 1, use parallel and.
      NC = Builder.CreateAnd(PC, CC);

    PBI->replaceUsesOfWith(CC, NC);
    PC = NC;
    if (CB == LastCondBlock)
      Iteration = false;
    // Remove internal conditional branches.
    CB->dropAllReferences();
    // make CB unreachable and let downstream to delete the block.
    new UnreachableInst(CB->getContext(), CB);
  } while (Iteration);

  Builder.SetInsertPoint(SaveInsertBB, SaveInsertPt);
  DEBUG(dbgs() << "Use parallel and/or in:\n" << *FirstCondBlock);
  return true;
}

		static Value* emitCond(IRBuilder<>& builder, Value* arg) {
			return builder.CreateICmpNE(builder.CreateAnd(arg, builder.getInt64(1)), builder.getInt64(0));
		}