Re: [bug-gawk] Stale cache of MPFR formatted+rounded strings

[arnold]

Thanks for the report.  The dev team will think about this.

Thanks,

Arnold

Nethox <address@hidden> wrote:

> Compiled from the tarball on GNU/Linux x86:
> $ gawk -V | head -1
> GNU Awk 4.2.0, API: 2.0 (GNU MPFR 3.1.5, GNU MP 6.1.2)
>
> Minimal reproducible test:
> $ cat mpfrrndeval.min.awk
> BEGIN {
>         pi = 3.1416
>         OFMT = "%.f"
>         print pi  # ROUNDMODE = "N" by default.
>         ROUNDMODE = "U"
>         print pi
> }
> $ gawk -M -f ./mpfrrndeval.min.awk
> 3
> 3
> $ cat mpfrrndeval.min.ok
> 3
> 4
>
> GAWK seems to cache the MPFR formatted+rounded string for each variable
> printed with OFMT or CONVFMT (not printf). However, this cache is not
> discarded when ROUNDMODE is assigned to a different mode, so only the first
> printing is correct for certain.
> Workarounds: reassigning pi=3.1416 or pi=pi+0 before every print
> evaluation; reassigning OFMT/CONVFMT to a different precision before every
> print evaluation; replacing each print lvalue argument with rvalues like
> the literal 3.1416 or pi+0.
> Useless things: --lint, --no-optimize.
>
> I attach a more complete test and results (filenames without .min).
>
> Regards.