コード例 #1
0
ファイル: LiteralSupport.cpp プロジェクト: CompuCell3D/VTL
/// GetIntegerValue - Convert this numeric literal value to an APInt that
/// matches Val's input width.  If there is an overflow, set Val to the low bits
/// of the result and return true.  Otherwise, return false.
bool NumericLiteralParser::GetIntegerValue(llvm::APInt &Val) {
	// Fast path: Compute a conservative bound on the maximum number of
	// bits per digit in this radix. If we can't possibly overflow a
	// uint64 based on that bound then do the simple conversion to
	// integer. This avoids the expensive overflow checking below, and
	// handles the common cases that matter (small decimal integers and
	// hex/octal values which don't overflow).
	const unsigned NumDigits = SuffixBegin - DigitsBegin;
	if (alwaysFitsInto64Bits(radix, NumDigits)) {
		uint64_t N = 0;
		for (const char *Ptr = DigitsBegin; Ptr != SuffixBegin; ++Ptr)
			if (!isDigitSeparator(*Ptr))
				N = N * radix + llvm::hexDigitValue(*Ptr);

		// This will truncate the value to Val's input width. Simply check
		// for overflow by comparing.
		Val = N;
		return Val.getZExtValue() != N;
	}

	Val = 0;
	const char *Ptr = DigitsBegin;

	llvm::APInt RadixVal(Val.getBitWidth(), radix);
	llvm::APInt CharVal(Val.getBitWidth(), 0);
	llvm::APInt OldVal = Val;

	bool OverflowOccurred = false;
	while (Ptr < SuffixBegin) {
		if (isDigitSeparator(*Ptr)) {
			++Ptr;
			continue;
		}

		unsigned C = llvm::hexDigitValue(*Ptr++);

		// If this letter is out of bound for this radix, reject it.
		assert(C < radix && "NumericLiteralParser ctor should have rejected this");

		CharVal = C;

		// Add the digit to the value in the appropriate radix.  If adding in digits
		// made the value smaller, then this overflowed.
		OldVal = Val;

		// Multiply by radix, did overflow occur on the multiply?
		Val *= RadixVal;
		OverflowOccurred |= Val.udiv(RadixVal) != OldVal;

		// Add value, did overflow occur on the value?
		//   (a + b) ult b  <=> overflow
		Val += CharVal;
		OverflowOccurred |= Val.ult(CharVal);
	}
	return OverflowOccurred;
}
コード例 #2
0
ファイル: ClusteredBitVector.cpp プロジェクト: Daford/swift
ClusteredBitVector ClusteredBitVector::fromAPInt(const llvm::APInt &bits) {
  // This is not a very efficient algorithm.
  ClusteredBitVector result;
  for (unsigned i = 0, e = bits.getBitWidth(); i != e; ++i) {
    if (bits[i]) {
      result.appendSetBits(1);
    } else {
      result.appendClearBits(1);
    }
  }
  return result;
}
コード例 #3
0
ファイル: ASTImporter.cpp プロジェクト: YabinHu/mlang
/// \brief Determine if two APInts have the same value, after zero-extending
/// one of them (if needed!) to ensure that the bit-widths match.
static bool IsSameValue(const llvm::APInt &I1, const llvm::APInt &I2) {
  if (I1.getBitWidth() == I2.getBitWidth())
    return I1 == I2;
  
  if (I1.getBitWidth() > I2.getBitWidth())
    return I1 == I2.zext(I1.getBitWidth());
  
  return I1.zext(I2.getBitWidth()) == I2;
}
コード例 #4
0
ファイル: Expr.cpp プロジェクト: YabinHu/mlang
//===----------------------------------------------------------------------===//
// Primary Expressions.
//===----------------------------------------------------------------------===//
void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) {
  if (hasAllocation())
    C.Deallocate(pVal);

  BitWidth = Val.getBitWidth();
  unsigned NumWords = Val.getNumWords();
  const uint64_t* Words = Val.getRawData();
  if (NumWords > 1) {
    pVal = new (C) uint64_t[NumWords];
    std::copy(Words, Words + NumWords, pVal);
  } else if (NumWords == 1)
    VAL = Words[0];
  else
    VAL = 0;
}
コード例 #5
0
ファイル: Inst.cpp プロジェクト: alexanderkyte/souper
std::string Inst::getKnownBitsString(llvm::APInt Zero, llvm::APInt One) {
  std::string Str;
  for (int K=Zero.getBitWidth()-1; K>=0; --K) {
    if (Zero[K] && One[K])
      llvm_unreachable("KnownZero and KnownOnes bit can't be set to 1 together");
    if (Zero[K]) {
      Str.append("0");
    } else {
      if (One[K])
        Str.append("1");
      else
        Str.append("x");
    }
  }
  return Str;
}
コード例 #6
0
ファイル: generator.cpp プロジェクト: SavourySnaX/EDL
bool CompareEquals(llvm::APInt a,llvm::APInt b)
{
	if (a.getBitWidth()!=b.getBitWidth())
	{
		if (a.getBitWidth()<b.getBitWidth())
			a=a.zext(b.getBitWidth());
		else
			b=b.zext(a.getBitWidth());
	}

	return a==b;
}