Philipp Krause

Another comparison of C compilers for the STM8

Discussion created by Philipp Krause on Feb 11, 2018
Latest reply on Apr 21, 2018 by dragomir.raimond

About two years ago, I did a comparison of C compilers for the STM8. It can now be found at


I also redid the comparison and placed it at


For Cosmic, SDCC, IAR the current versions of the compilers were used. Due to difficulties with Raisonance evaluation licenses, an older version of Raisonance was used.


Quick summary of what happened since 2016: Cosmic and IAR improved a bit in various aspects. SDCC made huge progress. In mid-2016, code speed and size were weaknesses of SDCC. Now, for Dhrystone and Coremark, SDCC generates faster code than any other compiler (but floating-point performance and thus Whetstone scores are still bad). In terms of code size, it is now about on par with Cosmic, which means better than IAR and worse than Raisonance.