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Global variable alignment

Miguel Sebastián
Note: This was originally posted on 13th January 2011 at http://forums.arm.com

Hi,

I am working with RealView Compilation Tools v2.1.  I need to align a static global variable on a 16-byte boundary.  In the 'Compiler and Libraries Guide' document, section 3.1.3, the __align(n) keyword is explained.  It is not clear to me if n=16 is allowed for a static global variable.  I have tried it and it appears to be working, but I would like to confirm it.

Best Regards,
  Miguel
Parents
  • Note: This was originally posted on 19th January 2011 at http://forums.arm.com

    Hi,

    The point is that RVCT 2.1 says: '[font="Times-Roman"][size="2"]You can specify a power of two for the alignment boundary, however eight is the maximum for auto variables'.  As I understand, an 'auto' variable is the same as a 'local' variable, so it is not clear to me what is the limitation for global variables.

    Regards,
      Miguel[/size][/font]
Reply
  • Note: This was originally posted on 19th January 2011 at http://forums.arm.com

    Hi,

    The point is that RVCT 2.1 says: '[font="Times-Roman"][size="2"]You can specify a power of two for the alignment boundary, however eight is the maximum for auto variables'.  As I understand, an 'auto' variable is the same as a 'local' variable, so it is not clear to me what is the limitation for global variables.

    Regards,
      Miguel[/size][/font]
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