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becomes
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void swapBufferHalves( U8 *buf, U32 start, U32 length ) {
    register U64 *p1 = (U64*)&buf[ start ];
...
    }
    return;
}

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becomes
[Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X0 X1 X2 X3 X4 X5 X6 X7 X8 X9]