diff --git a/runtime/src/main/cpp/dtoa/dblparse.cpp b/runtime/src/main/cpp/dtoa/dblparse.cpp
index eaf8f89e4a0..8bc8d4176f8 100644
--- a/runtime/src/main/cpp/dtoa/dblparse.cpp
+++ b/runtime/src/main/cpp/dtoa/dblparse.cpp
@@ -53,6 +53,17 @@ KDouble Konan_NumberConverter_ceil(KDouble x) {
 }
 
 void Kotlin_IntArray_set(KRef thiz, KInt index, KInt value);
+
+KDouble Konan_long_bits_to_double(KLong x);
+}
+
+KDouble Konan_long_bits_to_double(KLong x) {
+  union {
+    int64_t x;
+    double d;
+  } tmp;
+  tmp.x = x;
+  return tmp.d;
 }
 
 KDouble createDouble (const char *s, KInt e);
diff --git a/runtime/src/main/cpp/dtoa/fltparse.cpp b/runtime/src/main/cpp/dtoa/fltparse.cpp
index df9137aca41..ce3da3d8ce7 100644
--- a/runtime/src/main/cpp/dtoa/fltparse.cpp
+++ b/runtime/src/main/cpp/dtoa/fltparse.cpp
@@ -39,8 +39,18 @@
 #define DEFAULT_WIDTH MAX_ACCURACY_WIDTH
 
 extern "C" {
-KFloat
-Konan_FloatingPointParser_parseFloatImpl (KString s, KInt e);
+KFloat Konan_FloatingPointParser_parseFloatImpl (KString s, KInt e);
+
+KFloat Konan_int_bits_to_float(KInt x);
+}
+
+KFloat Konan_int_bits_to_float(KInt x) {
+  union {
+    int32_t x;
+    float f;
+  } tmp;
+  tmp.x = x;
+  return tmp.f;
 }
 
 KFloat createFloat1 (U_64 * f, IDATA length, KInt e);
diff --git a/runtime/src/main/kotlin/konan/internal/FloatingPointParser.kt b/runtime/src/main/kotlin/konan/internal/FloatingPointParser.kt
index bcb41652f57..65ae41d3f23 100644
--- a/runtime/src/main/kotlin/konan/internal/FloatingPointParser.kt
+++ b/runtime/src/main/kotlin/konan/internal/FloatingPointParser.kt
@@ -336,8 +336,7 @@ object FloatingPointParser {
 
         // See if it could be a hexadecimal representation.
         if (parseAsHex(s)) {
-            TODO("Hex format is not supported")
-            //return HexStringParser.parseDouble(s)
+            return HexStringParser.parseDouble(s)
         }
 
         val info = initialParse(s, length)
@@ -389,8 +388,7 @@ object FloatingPointParser {
 
         // See if it could be a hexadecimal representation.
         if (parseAsHex(s)) {
-            TODO("Hex format is not supported")
-            //return HexStringParser.parseFloat(s)
+            return HexStringParser.parseFloat(s)
         }
 
         val info = initialParse(s, length)
diff --git a/runtime/src/main/kotlin/konan/internal/HexStringParser.kt b/runtime/src/main/kotlin/konan/internal/HexStringParser.kt
index 3653151b038..942235ae7a3 100644
--- a/runtime/src/main/kotlin/konan/internal/HexStringParser.kt
+++ b/runtime/src/main/kotlin/konan/internal/HexStringParser.kt
@@ -17,350 +17,352 @@
 
 package konan.internal
 
-// TODO: Enable as soon as regexes are supported.
+import kotlin.text.regex.*
+
+@SymbolName("Konan_int_bits_to_float")
+private external fun intBitsToFloat(x: Int): Float
+
+@SymbolName("Konan_long_bits_to_double")
+private external fun longBitsToDouble(x: Long): Double
 
 /*
  * Parses hex string to a single or double precision floating point number.
  */
-//internal class HexStringParser(private val EXPONENT_WIDTH: Int, private val MANTISSA_WIDTH: Int) {
-//
-//    private val EXPONENT_BASE: Long
-//
-//    private val MAX_EXPONENT: Long
-//
-//    private val MIN_EXPONENT: Long
-//
-//    private val MANTISSA_MASK: Long
-//
-//    private var sign: Long = 0
-//
-//    private var exponent: Long = 0
-//
-//    private var mantissa: Long = 0
-//
-//    private var abandonedNumber = "" //$NON-NLS-1$
-//
-//    init {
-//
-//        this.EXPONENT_BASE = (-1L shl EXPONENT_WIDTH - 1).inv()
-//        this.MAX_EXPONENT = (-1L shl EXPONENT_WIDTH).inv()
-//        this.MIN_EXPONENT = (-(MANTISSA_WIDTH + 1)).toLong()
-//        this.MANTISSA_MASK = (-1L shl MANTISSA_WIDTH).inv()
-//    }
-//
-//    private fun parse(hexString: String): Long {
-//        val hexSegments = getSegmentsFromHexString(hexString)
-//        val signStr = hexSegments[0]
-//        val significantStr = hexSegments[1]
-//        val exponentStr = hexSegments[2]
-//
-//        parseHexSign(signStr)
-//        parseExponent(exponentStr)
-//        parseMantissa(significantStr)
-//
-//        sign = sign shl (MANTISSA_WIDTH + EXPONENT_WIDTH)
-//        exponent = exponent shl MANTISSA_WIDTH
-//        return sign or exponent or mantissa
-//    }
-//
-//    /*
-//     * Parses the sign field.
-//     */
-//    private fun parseHexSign(signStr: String) {
-//        this.sign = (if (signStr == "-") 1 else 0).toLong() //$NON-NLS-1$
-//    }
-//
-//    /*
-//     * Parses the exponent field.
-//     */
-//    private fun parseExponent(exponentStr: String) {
-//        var exponentStr = exponentStr
-//        val leadingChar = exponentStr[0]
-//        val expSign = if (leadingChar == '-') -1 else 1
-//        if (!Character.isDigit(leadingChar)) {
-//            exponentStr = exponentStr.substring(1)
-//        }
-//
-//        try {
-//            exponent = expSign * exponentStr.toLong()
-//            checkedAddExponent(EXPONENT_BASE)
-//        } catch (e: NumberFormatException) {
-//            exponent = expSign * Long.MAX_VALUE
-//        }
-//
-//    }
-//
-//    /*
-//     * Parses the mantissa field.
-//     */
-//    private fun parseMantissa(significantStr: String) {
-//        val strings = significantStr.split("\\.".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray() //$NON-NLS-1$
-//        val strIntegerPart = strings[0]
-//        val strDecimalPart = if (strings.size > 1) strings[1] else "" //$NON-NLS-1$
-//
-//        var significand = getNormalizedSignificand(strIntegerPart, strDecimalPart)
-//        if (significand == "0") { //$NON-NLS-1$
-//            setZero()
-//            return
-//        }
-//
-//        val offset = getOffset(strIntegerPart, strDecimalPart)
-//        checkedAddExponent(offset.toLong())
-//
-//        if (exponent >= MAX_EXPONENT) {
-//            setInfinite()
-//            return
-//        }
-//
-//        if (exponent <= MIN_EXPONENT) {
-//            setZero()
-//            return
-//        }
-//
-//        if (significand.length > MAX_SIGNIFICANT_LENGTH) {
-//            abandonedNumber = significand.substring(MAX_SIGNIFICANT_LENGTH)
-//            significand = significand.substring(0, MAX_SIGNIFICANT_LENGTH)
-//        }
-//
-//        mantissa = significand.toLong(HEX_RADIX)
-//
-//        if (exponent >= 1) {
-//            processNormalNumber()
-//        } else {
-//            processSubNormalNumber()
-//        }
-//
-//    }
-//
-//    private fun setInfinite() {
-//        exponent = MAX_EXPONENT
-//        mantissa = 0
-//    }
-//
-//    private fun setZero() {
-//        exponent = 0
-//        mantissa = 0
-//    }
-//
-//    private fun signum(x: Long) = when {
-//        x == 0L -> 0
-//        x > 0L -> 1
-//        else -> -1
-//    }
-//
-//    /*
-//     * Sets the exponent variable to Long.MAX_VALUE or -Long.MAX_VALUE if
-//     * overflow or underflow happens.
-//     */
-//    private fun checkedAddExponent(offset: Long) {
-//        val result = exponent + offset
-//        val expSign = signum(exponent)
-//        if (expSign * signum(offset) > 0 && expSign * signum(result) < 0) {
-//            exponent = expSign * Long.MAX_VALUE
-//        } else {
-//            exponent = result
-//        }
-//    }
-//
-//    private fun processNormalNumber() {
-//        val desiredWidth = MANTISSA_WIDTH + 2
-//        fitMantissaInDesiredWidth(desiredWidth)
-//        round()
-//        mantissa = mantissa and MANTISSA_MASK
-//    }
-//
-//    private fun processSubNormalNumber() {
-//        var desiredWidth = MANTISSA_WIDTH + 1
-//        desiredWidth += exponent.toInt()//lends bit from mantissa to exponent
-//        exponent = 0
-//        fitMantissaInDesiredWidth(desiredWidth)
-//        round()
-//        mantissa = mantissa and MANTISSA_MASK
-//    }
-//
-//    /*
-//     * Adjusts the mantissa to desired width for further analysis.
-//     */
-//    private fun fitMantissaInDesiredWidth(desiredWidth: Int) {
-//        val bitLength = countBitsLength(mantissa)
-//        if (bitLength > desiredWidth) {
-//            discardTrailingBits((bitLength - desiredWidth).toLong())
-//        } else {
-//            mantissa = mantissa shl (desiredWidth - bitLength)
-//        }
-//    }
-//
-//    /*
-//     * Stores the discarded bits to abandonedNumber.
-//     */
-//    private fun discardTrailingBits(num: Long) {
-//        val mask = (-1L shl num.toInt()).inv()
-//        abandonedNumber += mantissa and mask
-//        mantissa = mantissa shr num.toInt()
-//    }
-//
-//    /*
-//     * The value is rounded up or down to the nearest infinitely precise result.
-//     * If the value is exactly halfway between two infinitely precise results,
-//     * then it should be rounded up to the nearest infinitely precise even.
-//     */
-//    private fun round() {
-//        val result = abandonedNumber.replace("0+".toRegex(), "") //$NON-NLS-1$ //$NON-NLS-2$
-//        val moreThanZero = result.length > 0
-//
-//        val lastDiscardedBit = (mantissa and 1L).toInt()
-//        mantissa = mantissa shr 1
-//        val tailBitInMantissa = (mantissa and 1L).toInt()
-//
-//        if (lastDiscardedBit == 1 && (moreThanZero || tailBitInMantissa == 1)) {
-//            val oldLength = countBitsLength(mantissa)
-//            mantissa += 1L
-//            val newLength = countBitsLength(mantissa)
-//
-//            //Rounds up to exponent when whole bits of mantissa are one-bits.
-//            if (oldLength >= MANTISSA_WIDTH && newLength > oldLength) {
-//                checkedAddExponent(1)
-//            }
-//        }
-//    }
-//
-//    /*
-//     * Returns the normalized significand after removing the leading zeros.
-//     */
-//    private fun getNormalizedSignificand(strIntegerPart: String, strDecimalPart: String): String {
-//        var significand = strIntegerPart + strDecimalPart
-//        significand = significand.replaceFirst("^0+".toRegex(), "") //$NON-NLS-1$//$NON-NLS-2$
-//        if (significand.length == 0) {
-//            significand = "0" //$NON-NLS-1$
-//        }
-//        return significand
-//    }
-//
-//    /*
-//     * Calculates the offset between the normalized number and unnormalized
-//     * number. In a normalized representation, significand is represented by the
-//     * characters "0x1." followed by a lowercase hexadecimal representation of
-//     * the rest of the significand as a fraction.
-//     */
-//    private fun getOffset(strIntegerPart: String, strDecimalPart: String): Int {
-//        var strIntegerPart = strIntegerPart
-//        strIntegerPart = strIntegerPart.replaceFirst("^0+".toRegex(), "") //$NON-NLS-1$ //$NON-NLS-2$
-//
-//        // If the Integer part is a nonzero number.
-//        if (strIntegerPart.length != 0) {
-//            val leadingNumber = strIntegerPart.substring(0, 1)
-//            return (strIntegerPart.length - 1) * 4 + countBitsLength(leadingNumber.toLong(HEX_RADIX)) - 1
-//        }
-//
-//        // If the Integer part is a zero number.
-//        var i = 0
-//        while (i < strDecimalPart.length && strDecimalPart[i] == '0') {
-//            i++
-//        }
-//        if (i == strDecimalPart.length) {
-//            return 0
-//        }
-//        val leadingNumber = strDecimalPart.substring(i, i + 1)
-//        return (-i - 1) * 4 + countBitsLength(leadingNumber.toLong(HEX_RADIX)) - 1
-//    }
-//
-//    fun numberOfLeadingZeros(i: Long): Int {
-//        // HD, Figure 5-6
-//        if (i == 0L)
-//            return 64
-//        var n = 1
-//        var x = (i ushr 32).toInt()
-//        if (x == 0) {
-//            n += 32
-//            x = i.toInt()
-//        }
-//        if (x ushr 16 == 0) {
-//            n += 16
-//            x = x shl 16
-//        }
-//        if (x ushr 24 == 0) {
-//            n += 8
-//            x = x shl 8
-//        }
-//        if (x ushr 28 == 0) {
-//            n += 4
-//            x = x shl 4
-//        }
-//        if (x ushr 30 == 0) {
-//            n += 2
-//            x = x shl 2
-//        }
-//        n -= x ushr 31
-//        return n
-//    }
-//
-//    private fun countBitsLength(value: Long): Int {
-//        val leadingZeros = numberOfLeadingZeros(value)
-//        return java.lang.Long.SIZE - leadingZeros
-//    }
-//
-//    companion object {
-//
-//        private val DOUBLE_EXPONENT_WIDTH = 11
-//
-//        private val DOUBLE_MANTISSA_WIDTH = 52
-//
-//        private val FLOAT_EXPONENT_WIDTH = 8
-//
-//        private val FLOAT_MANTISSA_WIDTH = 23
-//
-//        private val HEX_RADIX = 16
-//
-//        private val MAX_SIGNIFICANT_LENGTH = 15
-//
-//        private val HEX_SIGNIFICANT = "0[xX](\\p{XDigit}+\\.?|\\p{XDigit}*\\.\\p{XDigit}+)" //$NON-NLS-1$
-//
-//        private val BINARY_EXPONENT = "[pP]([+-]?\\d+)" //$NON-NLS-1$
-//
-//        private val FLOAT_TYPE_SUFFIX = "[fFdD]?" //$NON-NLS-1$
-//
-//        private val HEX_PATTERN = "[\\x00-\\x20]*([+-]?)$HEX_SIGNIFICANT" + //$NON-NLS-1$
-//
-//                BINARY_EXPONENT + FLOAT_TYPE_SUFFIX + "[\\x00-\\x20]*" //$NON-NLS-1$
-//
-//        private val PATTERN = Pattern.compile(HEX_PATTERN)
-//
-//        /*
-//         * Parses the hex string to a double number.
-//         */
-//        fun parseDouble(hexString: String): Double {
-//            val parser = HexStringParser(DOUBLE_EXPONENT_WIDTH,
-//                    DOUBLE_MANTISSA_WIDTH)
-//            val result = parser.parse(hexString)
-//            return java.lang.Double.longBitsToDouble(result)
-//        }
-//
-//        /*
-//         * Parses the hex string to a float number.
-//         */
-//        fun parseFloat(hexString: String): Float {
-//            val parser = HexStringParser(FLOAT_EXPONENT_WIDTH,
-//                    FLOAT_MANTISSA_WIDTH)
-//            val result = parser.parse(hexString).toInt()
-//            return java.lang.Float.intBitsToFloat(result)
-//        }
-//
-//        /*
-//         * Analyzes the hex string and extracts the sign and digit segments.
-//         */
-//        private fun getSegmentsFromHexString(hexString: String): Array<String> {
-//            val matcher = PATTERN.matcher(hexString)
-//            if (!matcher.matches()) {
-//                throw NumberFormatException()
-//            }
-//
-//            val hexSegments = arrayOf(
-//                    matcher.group(1),
-//                    matcher.group(2),
-//                    matcher.group(3)
-//            )
-//
-//            return hexSegments
-//        }
-//    }
-//}
\ No newline at end of file
+internal class HexStringParser(private val EXPONENT_WIDTH: Int, private val MANTISSA_WIDTH: Int) {
+
+    private val EXPONENT_BASE: Long
+
+    private val MAX_EXPONENT: Long
+
+    private val MIN_EXPONENT: Long
+
+    private val MANTISSA_MASK: Long
+
+    private var sign: Long = 0
+
+    private var exponent: Long = 0
+
+    private var mantissa: Long = 0
+
+    private var abandonedNumber = "" //$NON-NLS-1$
+
+    init {
+        this.EXPONENT_BASE = (-1L shl (EXPONENT_WIDTH - 1)).inv()
+        this.MAX_EXPONENT = (-1L shl EXPONENT_WIDTH).inv()
+        this.MIN_EXPONENT = (-(MANTISSA_WIDTH + 1)).toLong()
+        this.MANTISSA_MASK = (-1L shl MANTISSA_WIDTH).inv()
+    }
+
+    private fun parse(hexString: String): Long {
+        val hexSegments = getSegmentsFromHexString(hexString)
+        val signStr = hexSegments[0]
+        val significantStr = hexSegments[1]
+        val exponentStr = hexSegments[2]
+
+        parseHexSign(signStr)
+        parseExponent(exponentStr)
+        parseMantissa(significantStr)
+
+        sign = sign shl (MANTISSA_WIDTH + EXPONENT_WIDTH)
+        exponent = exponent shl MANTISSA_WIDTH
+        return sign or exponent or mantissa
+    }
+
+    /*
+     * Parses the sign field.
+     */
+    private fun parseHexSign(signStr: String) {
+        this.sign = (if (signStr == "-") 1 else 0).toLong() //$NON-NLS-1$
+    }
+
+    /*
+     * Parses the exponent field.
+     */
+    private fun parseExponent(exponentStr: String) {
+        var exponentStr = exponentStr
+        val leadingChar = exponentStr[0]
+        val expSign = if (leadingChar == '-') -1 else 1
+        if (!leadingChar.isDigit()) {
+            exponentStr = exponentStr.substring(1)
+        }
+
+        try {
+            exponent = expSign * exponentStr.toLong()
+            checkedAddExponent(EXPONENT_BASE)
+        } catch (e: NumberFormatException) {
+            exponent = expSign * Long.MAX_VALUE
+        }
+
+    }
+
+    /*
+     * Parses the mantissa field.
+     */
+    private fun parseMantissa(significantStr: String) {
+        val strings = significantStr.split("\\.".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray() //$NON-NLS-1$
+        val strIntegerPart = strings[0]
+        val strDecimalPart = if (strings.size > 1) strings[1] else "" //$NON-NLS-1$
+
+        var significand = getNormalizedSignificand(strIntegerPart, strDecimalPart)
+        if (significand == "0") { //$NON-NLS-1$
+            setZero()
+            return
+        }
+
+        val offset = getOffset(strIntegerPart, strDecimalPart)
+        checkedAddExponent(offset.toLong())
+
+        if (exponent >= MAX_EXPONENT) {
+            setInfinite()
+            return
+        }
+
+        if (exponent <= MIN_EXPONENT) {
+            setZero()
+            return
+        }
+
+        if (significand.length > MAX_SIGNIFICANT_LENGTH) {
+            abandonedNumber = significand.substring(MAX_SIGNIFICANT_LENGTH)
+            significand = significand.substring(0, MAX_SIGNIFICANT_LENGTH)
+        }
+
+        mantissa = significand.toLong(HEX_RADIX)
+
+        if (exponent >= 1) {
+            processNormalNumber()
+        } else {
+            processSubNormalNumber()
+        }
+
+    }
+
+    private fun setInfinite() {
+        exponent = MAX_EXPONENT
+        mantissa = 0
+    }
+
+    private fun setZero() {
+        exponent = 0
+        mantissa = 0
+    }
+
+    private fun signum(x: Long) = when {
+        x == 0L -> 0
+        x > 0L -> 1
+        else -> -1
+    }
+
+    /*
+     * Sets the exponent variable to Long.MAX_VALUE or -Long.MAX_VALUE if
+     * overflow or underflow happens.
+     */
+    private fun checkedAddExponent(offset: Long) {
+        val result = exponent + offset
+        val expSign = signum(exponent)
+        if (expSign * signum(offset) > 0 && expSign * signum(result) < 0) {
+            exponent = expSign * Long.MAX_VALUE
+        } else {
+            exponent = result
+        }
+    }
+
+    private fun processNormalNumber() {
+        val desiredWidth = MANTISSA_WIDTH + 2
+        fitMantissaInDesiredWidth(desiredWidth)
+        round()
+        mantissa = mantissa and MANTISSA_MASK
+    }
+
+    private fun processSubNormalNumber() {
+        var desiredWidth = MANTISSA_WIDTH + 1
+        desiredWidth += exponent.toInt()//lends bit from mantissa to exponent
+        exponent = 0
+        fitMantissaInDesiredWidth(desiredWidth)
+        round()
+        mantissa = mantissa and MANTISSA_MASK
+    }
+
+    /*
+     * Adjusts the mantissa to desired width for further analysis.
+     */
+    private fun fitMantissaInDesiredWidth(desiredWidth: Int) {
+        val bitLength = countBitsLength(mantissa)
+        if (bitLength > desiredWidth) {
+            discardTrailingBits((bitLength - desiredWidth).toLong())
+        } else {
+            mantissa = mantissa shl (desiredWidth - bitLength)
+        }
+    }
+
+    /*
+     * Stores the discarded bits to abandonedNumber.
+     */
+    private fun discardTrailingBits(num: Long) {
+        val mask = (-1L shl num.toInt()).inv()
+        abandonedNumber += mantissa and mask
+        mantissa = mantissa shr num.toInt()
+    }
+
+    /*
+     * The value is rounded up or down to the nearest infinitely precise result.
+     * If the value is exactly halfway between two infinitely precise results,
+     * then it should be rounded up to the nearest infinitely precise even.
+     */
+    private fun round() {
+        val result = abandonedNumber.replace("0+".toRegex(), "") //$NON-NLS-1$ //$NON-NLS-2$
+        val moreThanZero = result.length > 0
+
+        val lastDiscardedBit = (mantissa and 1L).toInt()
+        mantissa = mantissa shr 1
+        val tailBitInMantissa = (mantissa and 1L).toInt()
+
+        if (lastDiscardedBit == 1 && (moreThanZero || tailBitInMantissa == 1)) {
+            val oldLength = countBitsLength(mantissa)
+            mantissa += 1L
+            val newLength = countBitsLength(mantissa)
+
+            //Rounds up to exponent when whole bits of mantissa are one-bits.
+            if (oldLength >= MANTISSA_WIDTH && newLength > oldLength) {
+                checkedAddExponent(1)
+            }
+        }
+    }
+
+    /*
+     * Returns the normalized significand after removing the leading zeros.
+     */
+    private fun getNormalizedSignificand(strIntegerPart: String, strDecimalPart: String): String {
+        var significand = strIntegerPart + strDecimalPart
+        significand = significand.replaceFirst("^0+".toRegex(), "") //$NON-NLS-1$//$NON-NLS-2$
+        if (significand.length == 0) {
+            significand = "0" //$NON-NLS-1$
+        }
+        return significand
+    }
+
+    /*
+     * Calculates the offset between the normalized number and unnormalized
+     * number. In a normalized representation, significand is represented by the
+     * characters "0x1." followed by a lowercase hexadecimal representation of
+     * the rest of the significand as a fraction.
+     */
+    private fun getOffset(strIntegerPart: String, strDecimalPart: String): Int {
+        var strIntegerPart = strIntegerPart
+        strIntegerPart = strIntegerPart.replaceFirst("^0+".toRegex(), "") //$NON-NLS-1$ //$NON-NLS-2$
+
+        // If the Integer part is a nonzero number.
+        if (strIntegerPart.length != 0) {
+            val leadingNumber = strIntegerPart.substring(0, 1)
+            return (strIntegerPart.length - 1) * 4 + countBitsLength(leadingNumber.toLong(HEX_RADIX)) - 1
+        }
+
+        // If the Integer part is a zero number.
+        var i = 0
+        while (i < strDecimalPart.length && strDecimalPart[i] == '0') {
+            i++
+        }
+        if (i == strDecimalPart.length) {
+            return 0
+        }
+        val leadingNumber = strDecimalPart.substring(i, i + 1)
+        return (-i - 1) * 4 + countBitsLength(leadingNumber.toLong(HEX_RADIX)) - 1
+    }
+
+    fun numberOfLeadingZeros(i: Long): Int {
+        // HD, Figure 5-6
+        if (i == 0L)
+            return 64
+        var n = 1
+        var x = (i ushr 32).toInt()
+        if (x == 0) {
+            n += 32
+            x = i.toInt()
+        }
+        if (x ushr 16 == 0) {
+            n += 16
+            x = x shl 16
+        }
+        if (x ushr 24 == 0) {
+            n += 8
+            x = x shl 8
+        }
+        if (x ushr 28 == 0) {
+            n += 4
+            x = x shl 4
+        }
+        if (x ushr 30 == 0) {
+            n += 2
+            x = x shl 2
+        }
+        n -= x ushr 31
+        return n
+    }
+
+    private fun countBitsLength(value: Long) = 64 - numberOfLeadingZeros(value)
+
+    companion object {
+
+        private val DOUBLE_EXPONENT_WIDTH = 11
+
+        private val DOUBLE_MANTISSA_WIDTH = 52
+
+        private val FLOAT_EXPONENT_WIDTH = 8
+
+        private val FLOAT_MANTISSA_WIDTH = 23
+
+        private val HEX_RADIX = 16
+
+        private val MAX_SIGNIFICANT_LENGTH = 15
+
+        private val HEX_SIGNIFICANT = "0[xX](\\p{XDigit}+\\.?|\\p{XDigit}*\\.\\p{XDigit}+)" //$NON-NLS-1$
+
+        private val BINARY_EXPONENT = "[pP]([+-]?\\d+)" //$NON-NLS-1$
+
+        private val FLOAT_TYPE_SUFFIX = "[fFdD]?" //$NON-NLS-1$
+
+        private val HEX_PATTERN = "[\\x00-\\x20]*([+-]?)$HEX_SIGNIFICANT" + //$NON-NLS-1$
+
+                BINARY_EXPONENT + FLOAT_TYPE_SUFFIX + "[\\x00-\\x20]*" //$NON-NLS-1$
+
+        private val PATTERN = Regex(HEX_PATTERN)
+
+        /*
+         * Parses the hex string to a double number.
+         */
+        fun parseDouble(hexString: String): Double {
+            val parser = HexStringParser(DOUBLE_EXPONENT_WIDTH,
+                    DOUBLE_MANTISSA_WIDTH)
+            val result = parser.parse(hexString)
+            return longBitsToDouble(result)
+        }
+
+        /*
+         * Parses the hex string to a float number.
+         */
+        fun parseFloat(hexString: String): Float {
+            val parser = HexStringParser(FLOAT_EXPONENT_WIDTH,
+                    FLOAT_MANTISSA_WIDTH)
+            val result = parser.parse(hexString).toInt()
+            return intBitsToFloat(result)
+        }
+
+        /*
+         * Analyzes the hex string and extracts the sign and digit segments.
+         */
+        private fun getSegmentsFromHexString(hexString: String): Array<String> {
+            val matchResult = PATTERN.matchEntire(hexString)
+            if (matchResult == null) {
+                throw NumberFormatException()
+            }
+
+            val hexSegments = arrayOf(
+                    matchResult.groupValues[1],
+                    matchResult.groupValues[2],
+                    matchResult.groupValues[3]
+            )
+
+            return hexSegments
+        }
+    }
+}
\ No newline at end of file