Re: [C++] Don't fold __builtin_constant_p prematurely

[Marc Glisse <marc dot glisse at inria dot fr>]

Ping

On Tue, 16 Jul 2019, Marc Glisse wrote:

> Adding a C++ maintainer in Cc:
> https://gcc.gnu.org/ml/gcc-patches/2019-07/msg00808.html
>
> On Wed, 10 Jul 2019, Marc Glisse wrote:
>
> > Hello,
> >
> > this avoids folding __builtin_constant_p to 0 early when we are not forced 
> > to do so. Clearly this has an effect, since it uncovered a bug in 
> > wi::lshift, fixed today ;-)
> >
> > I wasn't sure about using |= or just =, the first one seemed more 
> > conservative.
> >
> > Bootstrap+regtest on x86_64-pc-linux-gnu.
> >
> > 2019-07-11  Marc Glisse  <marc.glisse@inria.fr>
> >
> > gcc/cp/
> > 	* constexpr.c (cxx_eval_builtin_function_call): Only set
> > 	force_folding_builtin_constant_p if manifestly_const_eval.
> >
> > gcc/testsuite/
> > 	* g++.dg/pr85746.C: New file.

--
Marc Glisse