On 9/26/2017 11:36 AM, Daniel Glöckner wrote:
Forgive me the brevity of my reply, but I should be asleep right now.
On Mon, Sep 25, 2017 at 09:16:12PM -0400, Charles Lohr wrote:
To do this, I need to port TCC to xtensa specifically lx6 with no floating
point.
It won't be easy to support floating point without floating point
registers. TinyCC is not prepared to keep floating point values in
integer registers. And you will need a soft float library like libgcc
that probably can't be built with TinyCC unless you also implement an
assembler.
Not a problem, the aforementioned ESP8266 is a hobbyist IoT
favourite. Standard toolchain is gcc and newlib.
For a C app in firmware, most things can be done without floating
point. Most old skool embedded coders will be doing fixed-point
calculations. However, there are a few scripting platforms for
ESP8266 (and more coming up), and platforms want to offer the most
convenient scripting environment for possibly first-time coders
who just want to get down to writing their app. So floats can be
desirable or critical, depending on your target app demographic.
For NodeMCU on ESP8266, they should switch to Lua 5.3 and so avoid
floats by using integers as much as possible while possibly
retaining convenient float capability with a library such as
Berkeley SoftFloat. For MicroPython, last I checked they didn't
seem to be in a hurry to implement floats.
One advantage of tcc on ESP8266 would be that even the current tcc
code quality will be much faster than Python or Lua scripts
running on a VM.
References for convenience:
https://en.wikipedia.org/wiki/ESP8266
https://github.com/esp8266/esp8266-wiki/wiki/Toolchain
https://github.com/pfalcon/esp-open-sdk
https://docs.micropython.org/en/latest/esp8266/esp8266/general.html
https://en.wikipedia.org/wiki/MicroPython
https://en.wikipedia.org/wiki/NodeMCU
https://github.com/nodemcu/nodemcu-firmware
--
Cheers,
Kein-Hong Man (esq.)
Selangor, Malaysia
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