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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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+1 Jacob Bramley over 12 years ago

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 up division routines.

I don't have any performance figures, but implementing the same functionality without using CLZ requires quite a few instructions.
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+1 Jacob Bramley over 12 years ago

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 up division routines.

I don't have any performance figures, but implementing the same functionality without using CLZ requires quite a few instructions.
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