Ok so they are not outright banned but not recommended unless you can prove there are not any code size penalties? I'm now very interested in testing this on MIPS and will be querying our compiler engineers if there is a difference. I wonder if the fact that volatile acts as a compiler memory barrier that the compiled code is larger?
Neil On 27 Oct 2016 14:11, "Hauke Petersen" <[email protected]> wrote: > Sorry, saw Olegs mail only after I send mine... > > Cheers, > Hauke > > On 27.10.2016 15:06, Martine Lenders wrote: > >> Hi, >> >> 2016-10-27 15:01 GMT+02:00 Oleg Hahm <[email protected] <mailto: >> [email protected]>>: >> >> Hi Martine! >> >> On Thu, Oct 27, 2016 at 01:35:21PM +0200, Martine Lenders wrote: >> > >> As example I was able to save several 100 bytes of ROM when >> removing the >> > >> named bitfield use from the samr21s peripheral drivers. >> > > >> > > >> > I don't know about your specific code, but I was able to show, >> that a >> > bitfield actually *saves* ROM [1]. >> >> In your example the variables were not volatile. >> >> >> Right. That might be a factor ^^". >> >> Cheers, >> Martine >> >> >> _______________________________________________ >> devel mailing list >> [email protected] >> https://lists.riot-os.org/mailman/listinfo/devel >> > > _______________________________________________ > devel mailing list > [email protected] > https://lists.riot-os.org/mailman/listinfo/devel >
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