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ARM Assembly code - doubt.

vasanthfriend vasanthfriend
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  • Arm Employee Badge
    Note: This was originally posted on 4th August 2009 at http://forums.arm.com

    Both armcc (--cpu=arm926ej-s) and gcc (-mcpu=arm926ej-s -O1) will happily compile the appropriate C code to a single SMLAL instruction, e.g.:

    long long my_smlal(long long acc, int x, int y)
    {
      return acc + (long long)x * y;
    }

    i.e. there shouldn't be any need to resort to assembly here.

    hth
    s.
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  • Arm Employee Badge
    Note: This was originally posted on 4th August 2009 at http://forums.arm.com

    Both armcc (--cpu=arm926ej-s) and gcc (-mcpu=arm926ej-s -O1) will happily compile the appropriate C code to a single SMLAL instruction, e.g.:

    long long my_smlal(long long acc, int x, int y)
    {
      return acc + (long long)x * y;
    }

    i.e. there shouldn't be any need to resort to assembly here.

    hth
    s.
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