* David Aldrich via Gcc-help: > We are comparing results from our C++ app on Ubuntu 18.04 (gcc 7.3.0, glibc > 2.27 ) and Ubuntu 20.04 (gcc 9.3.0, glibc 2.31 ). We are seeing > significant differences in floating point calculation results across these > platforms. Define significant. 8-) There have been math function implementation changes in glibc in that version range. For most math functions, glibc does not guarantee correctly rounded results, and there multiple acceptable results for each input. Which one you get depends on glibc version and the function implementation chosen at run time (so there is a hardware/hypervisor component as well). Thanks, Florian
