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Need help identifying left most zero bit [message #30154]

Fri, 05 April 2002 10:07

plmcelwee
Messages: 6
Registered: April 2002

Junior Member

I'm working with negative (two's complement) 16-bit numbers and could
use some help. What I'd like to do is have a function that will tell
me the location of the left-most zero bit for any given negative
16-bit number. Here are some examples to illustrate my goal.

if x = -2, which is 1111 1111 1111 1110, then return 1
if x = -5, which is 1111 1111 1111 1011, then return 3
if x = -15, which is 1111 1111 1111 0111, then return 4
if x = -8, which is 1111 1111 1111 1000, then return 3

Is there something built-in to IDL that will accomplish this? Or does
anyone have any other suggestions?

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