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difference in calculation result when using gcc vs Visual studio and optimisation flag
- From: Игорь Сотниченко <igor dot sotnichenko at gmail dot com>
- To: gcc-help at gcc dot gnu dot org
- Date: Wed, 25 Apr 2018 16:27:05 +0500
- Subject: difference in calculation result when using gcc vs Visual studio and optimisation flag
Hello!
1. There is a decent difference between calculations on Visual studio
compiler and gcc 7.1 in calculation result of my program.
2. When optimization in gcc are disabled, then there is no
difference.
3. When I have replaced O2 with keys from O1 and O2 (
https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html), then there is no
difference in results, but there is a calculation speed degradation
compared to O2.