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x>>15

 
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sir_jfreyes



Joined: 10 Aug 2009
Posts: 6

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x>>15
PostPosted: Sun Aug 23, 2009 12:56 pm     Reply with quote
What is the best code in CCS for the instruction x>>15?
Ttelmah
Guest
PostPosted: Sun Aug 23, 2009 1:55 pm     Reply with quote
Probably depends on how large the data is.
For 16bit data, it'd probably be faster to just perform a bit test, on the top bit, and just output the result of this (0/1).
For larger data types, you really have no choice but to use the shift.

Best Wishes
bkamen



Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA

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PostPosted: Mon Aug 24, 2009 12:36 am     Reply with quote
Code:
unsigned int16 var;
unsigned int8 x;

var = 0x8000;

x = make8 ( var, 1);

if (x & 0x80) {
    do something;
} else {
    do something else;
}

also works is:
Code:

if (var & 0x8000) {
  do something;
}

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