Check if number fits 16 bits (signed or unsigned)

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zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 19 Dec 2017, 21:02

How can I optimize the following line (for fasmg):

Code:

if (num > 0 & num < 65536) | (num < 32768 & num >= -32768)

P.S. not knowing num bit length (num can be 32 or 64 or whatever number of bits)

19 Dec 2017, 21:02

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8356
Location: Kraków, Poland

Tomasz Grysztar 19 Dec 2017, 21:16

These are two overlapping intervals. The "or" condition is like an union of these intervals, so this is equivalent to:

Code:

if num < 65536 & num >= -32768

19 Dec 2017, 21:16

zhak

Joined: 12 Apr 2005
Posts: 501
Location: Belarus

zhak 19 Dec 2017, 21:37

Indeed, it's so obvious. I just overthought it too much. Thanks

19 Dec 2017, 21:37

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