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Atari coding BBS
| Re: DSP sign extend question |
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Posted by: mikro
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Oct,30.2013-14:09
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Don't know whether it's the fastest way but I remember one nice trick (courtesy of Kalms, IIRC):
(writing from the top of my head, so excuse any typos/errors!)
; x0 = 16bit input
move #>$008000,x1
move x0,a
and x1,a ; isolate the sign bit
eor x1,a ; flip
sub x1,a ; create mask
or x0,a ; a = sign extended result
Another way could have been two MPYs + Tcc + but I'm lazy to try it out :)
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[All messages in this thread] [Start new thread]
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Topic
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Posted by
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Date
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DSP sign extend question
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Thadoss
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Oct,30.2013-01:28
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Re: DSP sign extend question
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mikro
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Oct,30.2013-11:43
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Re: DSP sign extend question
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Thadoss
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Oct,30.2013-12:37
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Re: DSP sign extend question
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mikro
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Oct,30.2013-14:09
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Re: DSP sign extend question
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ggn
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Oct,30.2013-14:55
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Re: DSP sign extend question
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ggn
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Oct,30.2013-16:03
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Re: DSP sign extend question
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Thadoss
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Oct,30.2013-17:43
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Re: DSP sign extend question
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Thomas / New Beat
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Nov,07.2013-08:59
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Re: DSP sign extend question
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Thomas / New Beat
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Dec,11.2013-09:29
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Re: DSP sign extend question
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Thomas / New Beat
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Dec,12.2013-20:14
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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