I don't think any C or C++ compiler can help here, because (according
to a Web search just), the definition of % in the 98 standard is
"(a/b)*b + a%b == a" instead of what we want "floor(a/b)*b + a%b ==
a".
I would be in favor of a Faust-emitted incompatible operator
overloading of % for floats and doubles "float operator%(const float&,
const float&)" etc.
On Tue, Jan 1, 2019 at 3:34 AM Mykle Hansen wrote:
>
> Thanks Julius, I see what you mean. It's just a bit tricky to do,
> because this code is generated by the Faust compiler as part
> of the faust2caqt script. It’s pretty awkward to fix the source code
> and restart the script halfway through, tho I suppose it’s possible.
>
> I wonder if this is an issue with my compiler version.
> I’m trying to use Apple LLVM version 7.3.0, on OS X 10.11.6.
>
> Are there C++ compilers that know to promote % to fmod() when float arguments
> are present?
> What’s the current recommended compiler for compiling Faust-generated source?
>
> Thanks,
> -mykle-
>
> >
> > On Dec 31, 2018, at 7:17 PM, Julius Smith wrote:
> >
> > Hi Mykle,
> >
> > I think the compiler means to convert % to fmod() for floating-point
> > args. I suggest using fmod() explicitly in place of "%" in your
> > source for now as a workaround.
>
> > - Julius
> >
> > On Mon, Dec 31, 2018 at 7:36 AM Mykle James Hansen wrote:
> >>
> >> Hi, can I ask some advice?
> >>
> >> I’m trying to compile a 60-line Faust program into a standalone app,
> >> but Faust is generating some code that won’t compile on my system.
> >> The code tries to use a float as the argument to the modulo
> >> operator (%), yielding the error message in the subject line.
> >> Anybody seen this before?
> >>
> >> I’m experiencing this when I try to run faust2caqt — it dies with
> >> a compiler error:
> >>
> >>> looper3.cpp:16736:56: error: invalid operands to binary expression
> >>> ('float' and 'float')
> >>>fRec4[0] = ((float(iSlow3) * (fRec1[0] +
> >>> fRec4[1])) % fTemp2);
> >>>
> >>> ~~~ ^ ~~
> >>> looper3.cpp:16737:42: error: invalid operands to binary expression
> >>> ('float' and 'float')
> >>>ftbl0[int((iTemp1?((fRec4[0] + -1.0f) %
> >>> fTemp2):131071.0f))] = fRec0[1];
> >>> ~~ ^ ~~
> >>>
> >>
> >> But the problem's not just faust2caqt. Running just ‘faust looper3.dsp’
> >> also generates those lines.
> >>
> >> OTOH, I am able to run this same Faust program in FaustLive no
> >> problem, and I can also run it in the online editor.
> >>
> >> I just pulled and built the latest Faust compiler (master branch) to see if
> >> that would help, but that didn’t seem to make a change.
> >> Any advice would be most appreciated.
> >>
> >> Yrs stumpedly,
> >> -mykle-
> >>
> >> ___
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> >> Faudiostream-users@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/faudiostream-users
> >
> >
> >
> > --
> >
> > Julius O. Smith III
> > Professor of Music and, by courtesy, Electrical Engineering
> > CCRMA, Stanford University
> > http://ccrma.stanford.edu/~jos/
>
>
>
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--
Julius O. Smith III
Professor of Music and, by courtesy, Electrical Engineering
CCRMA, Stanford University
http://ccrma.stanford.edu/~jos/
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