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Vector shift with Neon error

John Mudumbe
Note: This was originally posted on 28th March 2013 at http://forums.arm.com

Hi Everyone,

I am trying to shift elements in the vectors with a constant int variable,
but i get an error during compile time saying : arm_neon.h:3850  error: argument must be a constant.
whenever i replace the constant int variable with a constant value , the compiler works just fine.
I have tried to search for solutions online but i am not getting anywhere.

I am using a 2009q arm tool chain and I also tried the using the Dstream tool chain but it is not working for arm cortex A8.
if anyone heres my cry for help and has a solution please reach out and help urgently..
Parents
  • Note: This was originally posted on 4th April 2013 at http://forums.arm.com

    I wanted to know, am running the MVC code on arm-cortex A8 and I want to see how much of the code is optimized, is gprof- good enough or is there any other tool I can use?
    I have noticed that the gprof is not consistent in terms of time calculations spend on all procedures.
    What other tool can I use to find time precision?
    Converting the above code in assmbly language will it also improve the neon optimization or there is no difference at all?
Reply
  • Note: This was originally posted on 4th April 2013 at http://forums.arm.com

    I wanted to know, am running the MVC code on arm-cortex A8 and I want to see how much of the code is optimized, is gprof- good enough or is there any other tool I can use?
    I have noticed that the gprof is not consistent in terms of time calculations spend on all procedures.
    What other tool can I use to find time precision?
    Converting the above code in assmbly language will it also improve the neon optimization or there is no difference at all?
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