On Wed, 24 May 2023 at 06:52, Alexandre Oliva via Libstdc++ <
libstdc++@gcc.gnu.org> wrote:

>
> Just as on aarch64, x86's wider long double experiences loss of
> precision with from_chars implemented in terms of double.  Expect the
> execution fail.
>
> Bootstrapped on x86_64-linux-gnu.  Also tested on ppc- and x86-vx7r2
> with gcc-12.
>

OK for trunk and branches.



>
> for  libstdc++-v3/ChangeLog
>
>         * testsuite/20_util/to_chars/long_double.cc: Expect execution
>         fail on x86-vxworks.
> ---
>  .../testsuite/20_util/to_chars/long_double.cc      |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
> b/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
> index 263144bd42cba..08363d9d04003 100644
> --- a/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
> +++ b/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
> @@ -36,7 +36,7 @@
>
>  // On systems that use double-precision from_chars for long double,
>  // this is expected to fail.
> -// { dg-xfail-run-if "from_chars limited to double-precision" {
> aarch64-*-vxworks* } }
> +// { dg-xfail-run-if "from_chars limited to double-precision" {
> aarch64-*-vxworks* i*86-*-vxworks* } }
>
>  // { dg-require-effective-target ieee_floats }
>  // { dg-require-effective-target size32plus }
>
> --
> Alexandre Oliva, happy hacker                https://FSFLA.org/blogs/lxo/
>    Free Software Activist                       GNU Toolchain Engineer
> Disinformation flourishes because many people care deeply about injustice
> but very few check the facts.  Ask me about <https://stallmansupport.org>
>
>