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

Description:
    If the respective bytes of m1 are equal to the respective bytes of m2,
    the respective bytes of the result are set to all ones, otherwise they
    are set to all zeros.

Returns:
    The result of comparing the packed bytes of two 64-bit multimedia values
    is returned as a sequence of bytes (0xff for equal, 0x00 for not equal).

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_pcmpeqb( b, c );
        printf( "m1="AS_BYTES"\n"
                "m2="AS_BYTES"\n"
                "mm="AS_BYTES"\n",
            b._8[7], b._8[6], b._8[5], b._8[4],
            b._8[3], b._8[2], b._8[1], b._8[0],
            c._8[7], c._8[6], c._8[5], c._8[4],
            c._8[3], c._8[2], c._8[1], c._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:

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

Classification:
    Intel

Systems:
    MACRO

See Also:
    _m_empty, _m_pcmpeqd, _m_pcmpeqw, _m_pcmpgtb, _m_pcmpgtd, _m_pcmpgtw