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CM3 / RVDS / NOPs

David Clark
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  • Arm Employee Badge
    Note: This was originally posted on 15th June 2010 at http://forums.arm.com

    I guess the loop structure:
      do { __disable_irq(); } while (0)
    might have cause the NOPs.
    Although it didn't expand into a loop, the compiler might have reserved the space for instructions if a loop is needed.
    And because it is -O0, it didn't remove the unused instruction space and hence NOPs is used.
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  • Arm Employee Badge
    Note: This was originally posted on 15th June 2010 at http://forums.arm.com

    I guess the loop structure:
      do { __disable_irq(); } while (0)
    might have cause the NOPs.
    Although it didn't expand into a loop, the compiler might have reserved the space for instructions if a loop is needed.
    And because it is -O0, it didn't remove the unused instruction space and hence NOPs is used.
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