Re: [Tinycc-devel] -__inf__ and -__nan__ are not constant

[grischka]

On 23.07.2023 16:11, wizzwizz4 via Tinycc-devel wrote:
> I tried compiling QuickJS with tcc.
> After setting `-DEMSCRIPTEN -DCONFIG_VERSION=""`, I get:
>
> quickjs.c:2664: warning: function might return no value: 'JS_AtomGetKind'
> quickjs.c:39834: error: initializer element is not constant
>
> I'm guessing the error has something to do with this:

See tccgen.c:2491:

        /* NOTE: we only do constant propagation if finite number (not
           NaN or infinity) (ANSI spec) */

Not necessarily saying that this is what tcc is actually doing and/or
should do....

-- gr


> $ tcc -run -
> a = { 1e1000 };
> b = { -1e54 };
> c = { __inf__ };
> d = { +__inf__ };
> e = { -1.0 / 0.0 };
> f = { -__inf__ };
> -:6: error: initializer element is not constant
>
> For some reason, -__inf__ isn't considered a constexpr.
> Neither is -1e320, or -__nan__.
> Negating other float values, or not negating these ones, is fine.
>
> (Reader note: __inf__ and __nan__ are TCC implementation details;
>   in real programs, INFINITY and NAN from <math.h> should be used
>   instead.)
>
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