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ZAhma1's avatar
ZAhma1
Icon for New Contributor rankNew Contributor
6 years ago
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ALTERA_FP_FUNCTIONS Single Precision Multiplier doesn't seem to support subnormal numbers

I am trying to use a Single Precision Floating Point multiplier as generated by QSys in Quartus Prime 16.1.2. We are using an Arria 10 device so the option I have is to use the ALTERA_FP_FUNCTIONS mo...
  • AnandRaj_S_Intel's avatar
    AnandRaj_S_Intel
    6 years ago

    Yes, I got the problem.

    However Altera floating-point IP cores do not support denormal/subnormal number inputs. If the input is a denormal value, the IP core forces the value to zero and treats the value as a zero before going through any operation.

    Hence we are seeing output zero.

    Regards

    Anand

AnandRaj_S_Intel's avatar
AnandRaj_S_Intel
Icon for Regular Contributor rankRegular Contributor
6 years ago

Yes, I got the problem.

However Altera floating-point IP cores do not support denormal/subnormal number inputs. If the input is a denormal value, the IP core forces the value to zero and treats the value as a zero before going through any operation.

Hence we are seeing output zero.

Regards

Anand

  • ZAhma1's avatar
    ZAhma1
    Icon for New Contributor rankNew Contributor
    6 years ago

    OK. That's what I thought. Thanks for clarifying.

    Thanks!

    --Zohair