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Altera_Forum's avatar
Altera_Forum
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16 years ago

C2H fixed point mpy

I had an array of fixed point numbers, log values actually. 10 bit integer 22 bit fraction. Needed the sum of squares to calculate standard deviation. In regular C this works okay ... lo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

I tried your modification and it worked okay, so I retested the original version and that worked also. As noted in my edit above, some other problem generated a false complaint about the long long cast.

Does the compiler optimize away the unnecessary multipliers or does it genereate a 64 x 64 -> 128 multiplier?