Hi Philipp,
thank you for the good work ! All regression tests are OK ?
Vaclav
"ST marketing materials put STM8 Dhrystone performance at 0.29 DMIPS / Mhz.
However, when actually compiling the Dhrystone benchmark with different
C compilers optimizing for speed, the picture is a bit different:
Raisonance is at 0.289 DMIPS / Mhz and Cosmic at 0.296 DMIPS / Mhz, both
very close to the 0.29 DMIPS / Mhz stated by ST.
IAR outperforms them, and acheives 0.347 DMIPS / Mhz. All these numbers
are from the comparison at http://colecovision.eu/stm8/compilers.shtml,
which uses mid-2016 compilers.
SDCC used to perform worse at Dhrystone: SDCC 3.5.0 from last year only
achieves 0.151 DMIPS / Mhz. SDCC 3.6.0 was released on the 12th of June
2016 and improves this to 0.167 DMIPS / Mhz, still far worse than the
other compilers.
But current development versions of SDCC do much better: Revision #9652
is now at 0.355 DMIPS / Mhz. That means that SDCC went from worst to
best in a very short time. Besides the huge improvement in Dhrystone
scores, there was also a small reduction in Dhrystone code size.
Philipp
P.S.: Dhrystone was compiled using strong optimization for code speed:
sdcc -mstm8 -c -DNOSTRUCTASSIGN --max-allocs-per-node 100000
--opt-code-speed
"
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