On Wed, Dec 17, 2025 at 07:50:17PM +0000, Jonathan Wakely wrote:
> On 32-bit x86 the default -fexcess-precision=fast setting used by
> -std=gnu++20 results in unpredictable rounding which alters the number
> of times that std::generate_canonical produces exactly 1.0f, which
> means that the URBG is invoked a different number of times.
>
> To ensure that the behaviour is consistent and the expected number of
> calls happens, use -fexcess-precision=standard.
>
> libstdc++-v3/ChangeLog:
>
> *
> testsuite/26_numerics/random/uniform_real_distribution/operators/64351.cc:
> Add -fexcess-precision=standard to options.
> *
> testsuite/26_numerics/random/uniform_real_distribution/operators/gencanon.cc:
> Likewise.
LGTM.
Jakub
