fixed-point

Thankfully, the complex type modifier was introduced into C99 standard. What I don't understand is why it was decided to omit support for fixed point arithmetic (specifically, support fractional types like 1.15 {signed} or 0.32 {unsigned}) where these types are so fundamental to DSP programming? Does GCC support these through an extension? It's been discussed/proposed (e.g., in N938 , N953 ) but those papers have only proposed it as extensions, not additions to the main standard. Those seem to have led to its inclusion in N1169 , which is a draft of TR 18037 ("Extensions to support embedded

I am trying to use fixed point numbers in my VHDL project, but I keep having trouble implementing the library (found here http://www.eda-stds.org/fphdl/fixed_pkg_c.vhdl ). The error I receive when trying to simulate is this <ufixed> is not declared My question is how exactly should a library be implemented so it can be used? As of now I have added it to the project in the IEEE_PROPOSED library, but it is not working. All source code can be found here https://github.com/srohrer32/beamformer/tree/fixed_num , under the hdl folder and libraries folder. Are you using modelsim? Are you using a

For intense number-crunching i'm considering using fixed point instead of floating point. Of course it'll matter how many bytes the fixed point type is in size, on what CPU it'll be running on, if i can use (for Intel) the MMX or SSE or whatever new things come up... I'm wondering if these days when floating point runs faster than ever, is it ever worth considering fixed point? Are there general rules of thumb where we can say it'll matter by more than a few percent? What is the overview from 35,000 feet of numerical performance? (BTW, i'm assuming a general CPU as found in most computers, not

Closed . This question needs to be more focused. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it focuses on one problem only by editing this post . I have been trying for the last three days to understand the exact differences between floating and fixed point representations. I am confused reading the material and I'm unable to decide what is right and what is wrong. One of the problems is with the meaning of few technical terms like 'precision', 'mantissa', 'denormalised', 'underflows' etcetera. Can anyone give the differences with

I know it's really stupid question, but I don't know how to do this in bash: 20 / 30 * 100 It should be 66.67 but expr is saying 0 , because it doesn't support float. What command in Linux can replace expr and do this equalation? As reported in the bash man page: The shell allows arithmetic expressions to be evaluated, under certain circumstances...Evaluation is done in fixed-width integers with no check for overflow, though division by 0 is trapped and flagged as an error. You can multiply by 100 earlier to get a better, partial result: let j=20*100/30 echo $j 66 Or by a higher multiple of 10