Hello,
forgive me if my question is a litte bit weak in content and linguistic. I'm only a Hobbyist and english is not my nativ.
I'm trying to compile an App from Einstein@Home for AARCH64 using GCC. Einstein@Home is a DC-Projekt using Boinc. The App mainly calculates FFT's in single-precision using FFTW-lib. After the calculations are finished it send's them back to the Server and validates them against the same Tasks calculated by an different Host. Host's can vary over many different CPU-Architectures.
The Problem is that Task's from my AARCH64-App-Version are mostly above the threshold of the Validator. Compiling the App with the same settings for the AARCH32-Instructions on the same Device delivers Valid results. I've tryed this with many different Compiler-options, GCC-versions, lib-versions, with and without using of NEON. The result is always the same: AARCH64-invalid, AARCH32-valid.
I've readed in the ARMv8-documentions. But can't find somethink that influences the precion of float calcluations in a way that fit's to my Problem.
Sorry for that squishy Question but I don't know where to start to debug this.
Greetings from Germany
Hi n30dg and welcome to the Community!
I have moved your question to ARM Processors for better visibility.