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NEON-How to shift the whole D or Q to left or right?

Alan Chen
Note: This was originally posted on 12th July 2012 at http://forums.arm.com

Hello


   Base on NEON instuction set, I can find the VSHL or VSHR to perform shift operation. But it is just for every element.

How can I shift the whole D or Q register to left or right?

For instance, if D = 0x0001020304050607, when it shift right 8 bit, it should become D=0x0000010203040506.

 


Best Regards,
Alan Chen
Parents
  • Note: This was originally posted on 12th July 2012 at http://forums.arm.com


    Hello
    Base on NEON instuction set, I can find the VSHL or VSHR to perform shift operation. But it is just for every element.
    How can I shift the whole D or Q register to left or right?
    For instance, if D = 0x0001020304050607, when it shift right 8 bit, it should become D=0x0000010203040506.

    Best Regards,
    Alan Chen


    For byte shifting you can use VEXT instruction
    For bit shifting, I not sur you can do that with a simple instruction !

    Etienne

Reply
  • Note: This was originally posted on 12th July 2012 at http://forums.arm.com


    Hello
    Base on NEON instuction set, I can find the VSHL or VSHR to perform shift operation. But it is just for every element.
    How can I shift the whole D or Q register to left or right?
    For instance, if D = 0x0001020304050607, when it shift right 8 bit, it should become D=0x0000010203040506.

    Best Regards,
    Alan Chen


    For byte shifting you can use VEXT instruction
    For bit shifting, I not sur you can do that with a simple instruction !

    Etienne

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