Re: gcc optimisation breaks guile floating point

[Marius Vollmer]

Han-Wen Nienhuys <address@hidden> writes:

> I think that these double (as in twice) initializations are weird, and
> should go. Why not
> 
>     scm_t_double bla;
>     bla.tag = scm_double_tag
>     bla.pad = 0x0
>     bla.double = z;
>     return scm_double_cell (
>         ((scm_t_double_cell*) &bla) -> car,
>         ((scm_t_double_cell*) &bla) -> cbr,
>         ((scm_t_double_cell*) &bla) -> ccr,
>         ((scm_t_double_cell*) &bla) -> cdr);

This looks wierd as well, don't you think?

> Another option
> 
>   *((unsigned long *) z) = 0;
>   scm_remember ((SCM) z);
>   *((double *) z) = x;
>   return z;

I like this better (with a suitable comment of course).

I guess that the funny aliasing behaviour applies only to pointers to
floating point types, right?

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