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Synopsis:
    #include <mmintrin.h>
    __m64 _m_punpckhbw(__m64 *m1, __m64 *m2);

Description:
    The _m_punpckhbw function performs an interleaved unpack of the
    high-order data elements of m1 and m2.  It ignores the low-order bytes.
    When unpacking from a memory operand, the full 64-bit operand is
    accessed from memory but only the high-order 32 bits are utilized.  By
    choosing m1 or m2 to be zero, an unpacking of byte elements into word
    elements is performed.


                     m2                         m1
         -------------------------  -------------------------
         |b7|b6|b5|b4|b3|b2|b1|b0|  |b7|b6|b5|b4|b3|b2|b1|b0|
         -------------------------  -------------------------
          |  |  |  |                 |  |  |  |
          V  V  V  V                 V  V  V  V
          b7 b5 b3 b1                b6 b4 b2 b0

                       -------------------------
                       |b7|b6|b5|b4|b3|b2|b1|b0|
                       -------------------------
                             result


Returns:
    The result of the interleaved unpacking of the high-order bytes of two
    multimedia values is returned.

Example:
    #include <stdio.h>
    #include <mmintrin.h>

    #define AS_BYTES "%2.2x %2.2x %2.2x %2.2x " \
                     "%2.2x %2.2x %2.2x %2.2x"

    __m64   a;
    __m64   b = { 0x0004000300020001 };
    __m64   c = { 0xff7fff800080007f };

    void main()
      {
        a = _m_punpckhbw( b, c );
        printf( "m2="AS_BYTES" "
                "m1="AS_BYTES"\n"
                "mm="AS_BYTES"\n",
            c._8[7], c._8[6], c._8[5], c._8[4],
            c._8[3], c._8[2], c._8[1], c._8[0],
            b._8[7], b._8[6], b._8[5], b._8[4],
            b._8[3], b._8[2], b._8[1], b._8[0],
            a._8[7], a._8[6], a._8[5], a._8[4],
            a._8[3], a._8[2], a._8[1], a._8[0] );
      }

    produces the following:

    m2=ff 7f ff 80 00 80 00 7f m1=00 04 00 03 00 02 00 01
    mm=ff 00 7f 04 ff 00 80 03

Classification:
    Intel

Systems:
    MACRO

See Also:
    _m_empty, _m_punpckhdq, _m_punpckhwd, _m_punpcklbw, _m_punpckldq,
    _m_punpcklwd