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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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    Note: This was originally posted on 7th April 2009 at http://forums.arm.com

    > On the contrary, what then are the disadvantages of the CLZ instruction being included in the ARM9? If any?

    Well it probably takes a few extra gates to decode the instruction, but other than that not much...

    Okay, I see. So this extra circuitry is justified by the reduced number of clk cycles and memory usage. Thanks.

    But how many clock cycles does CLZ require to execute???
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    Note: This was originally posted on 7th April 2009 at http://forums.arm.com

    > On the contrary, what then are the disadvantages of the CLZ instruction being included in the ARM9? If any?

    Well it probably takes a few extra gates to decode the instruction, but other than that not much...

    Okay, I see. So this extra circuitry is justified by the reduced number of clk cycles and memory usage. Thanks.

    But how many clock cycles does CLZ require to execute???
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