Package io.netty.util.internal

Class SWARUtil

  • public final class SWARUtil
extends java.lang.Object
    Utility class for SWAR (SIMD within a register) operations.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static long applyPattern​(long word, long pattern)
      Applies a compiled pattern to given word.
      static long compilePattern​(byte byteToFind)
      Compiles given byte into a long pattern suitable for SWAR operations.
      static boolean containsLowerCase​(int word)
      Returns true if the given word contains at least one ASCII lowercase byte.
      static boolean containsLowerCase​(long word)
      Returns true if the given word contains at least one ASCII lowercase byte.
      static boolean containsUpperCase​(int word)
      Returns true if the given word contains at least one ASCII uppercase byte.
      static boolean containsUpperCase​(long word)
      Returns true if the given word contains at least one ASCII uppercase byte.
      static int getIndex​(long word, boolean isBigEndian)
      Returns the index of the first occurrence of byte that specificied in the pattern.
      static int toLowerCase​(int word)
      Returns a word with all bytes converted to lowercase ASCII.
      static long toLowerCase​(long word)
      Returns a word with all bytes converted to lowercase ASCII.
      static int toUpperCase​(int word)
      Returns a word with all bytes converted to uppercase ASCII.
      static long toUpperCase​(long word)
      Returns a word with all bytes converted to uppercase ASCII.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Method Detail

      • compilePattern

        public static long compilePattern​(byte byteToFind)
        Compiles given byte into a long pattern suitable for SWAR operations.

      • applyPattern

        public static long applyPattern​(long word,
                                long pattern)
        Applies a compiled pattern to given word. Returns a word where each byte that matches the pattern has the highest bit set.
        Parameters:
        word - the word to apply the pattern to
        pattern - the pattern to apply
        Returns:
        a word where each byte that matches the pattern has the highest bit set

      • getIndex

        public static int getIndex​(long word,
                           boolean isBigEndian)
        Returns the index of the first occurrence of byte that specificied in the pattern. If no pattern is found, returns 8.
        Parameters:
        word - the return value of applyPattern(long, long)
        isBigEndian - if true, if given word is big endian if false, if given word is little endian
        Returns:
        the index of the first occurrence of the specified pattern in the specified word. If no pattern is found, returns 8.

      • containsUpperCase

        public static boolean containsUpperCase​(long word)
        Returns true if the given word contains at least one ASCII uppercase byte.

      • containsUpperCase

        public static boolean containsUpperCase​(int word)
        Returns true if the given word contains at least one ASCII uppercase byte.

      • containsLowerCase

        public static boolean containsLowerCase​(long word)
        Returns true if the given word contains at least one ASCII lowercase byte.

      • containsLowerCase

        public static boolean containsLowerCase​(int word)
        Returns true if the given word contains at least one ASCII lowercase byte.

      • toLowerCase

        public static long toLowerCase​(long word)
        Returns a word with all bytes converted to lowercase ASCII.

      • toLowerCase

        public static int toLowerCase​(int word)
        Returns a word with all bytes converted to lowercase ASCII.

      • toUpperCase

        public static long toUpperCase​(long word)
        Returns a word with all bytes converted to uppercase ASCII.

      • toUpperCase

        public static int toUpperCase​(int word)
        Returns a word with all bytes converted to uppercase ASCII.