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Count Leading Zeros

lesbattersbie lesbattersbie over 12 years ago

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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Jacob Bramley over 12 years ago +1 verified

Note: This was originally posted on 6th April 2009 at http://forums.arm.com It's surprisingly useful when hand-optimizing assembler. I think it has benefits for some cryptographic routines, and it speeds...

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0 Peter Harris over 12 years ago

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...
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0 Peter Harris over 12 years ago

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...
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