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Broddo's avatar
Broddo
Icon for Occasional Contributor rankOccasional Contributor
6 months ago

NIOSV/g with FPU: inconsistent calculation results

I'm using a NIOSV/g with FPU enabled in a MAX10 project. The project involves heavy use of float point calculations, hence the need for the FPU. I noticed some occasionally inconsistent results in th...
Nios Architecture
Broddo's avatar
Broddo
Icon for Occasional Contributor rankOccasional Contributor
5 months ago

@BoonBengT_Altera @LYGOOI

My apologies again for the delay in responding. Yes I can confirm that the work-around suggested by @LYGOOI does address the problem - the FPU is producing consistently correct results now, so thanks for this!

However, disabling caching is a big trade off for my project as I'm executing in place from external flash. I'll need to profile this to determine if FPU without cache is more performant than soft-float with cache. For now, I'm working with the latter and will wait for the fix in a coming release.

Thanks once again,

Broddo