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Count Leading Zeros

lesbattersbie lesbattersbie
Note: This was originally posted on 6th April 2009 at http://forums.arm.com

Using the ARM9 CLZ instruction - I am wondering, generally, how often would it be required to use this function and does it justify its inclusion?
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  • 0 Arm Employee Badge
    Note: This was originally posted on 7th April 2009 at http://forums.arm.com

    For general purpose code it is commonly used for integer normalization (placing the MSB of the integer at a known location).

    In more practical terms normalized integers are used for optimized Newton-Raphson software integer division, as Jacob mentioned, but also things like  integer to floating point conversion, and bit-field priority decoders.
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  • 0 Arm Employee Badge
    Note: This was originally posted on 7th April 2009 at http://forums.arm.com

    For general purpose code it is commonly used for integer normalization (placing the MSB of the integer at a known location).

    In more practical terms normalized integers are used for optimized Newton-Raphson software integer division, as Jacob mentioned, but also things like  integer to floating point conversion, and bit-field priority decoders.
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