In assembler: store the number in a 64-bit register, shift/rotate left until the overflow bit is true and the loop count is the correct bit number.

Probably can't get much faster than that.

Naked blocks are fun! -- Randal L. Schwartz, Perl hacker

In reply to Re: Most Significant Set Bit by jwkrahn
in thread Most Significant Set Bit by coldr3ality

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