Manuel, On Tue, Sep 8, 2015 at 11:31 PM, Manuel López-Ibáñez <lopezibanez@xxxxxxxxx> wrote: > On 08/09/15 22:05, Mathieu Malaterre wrote: >> >> >> Ok, I think I understand now. -O0 did produce code that is compatible >> with -ffloat-store. However I am still required to use -ffloat-store >> (explicitly) for any other optimization (at least required with -O2 in >> my case). > > > You are not required to use -ffloat-store, neither is -ffloat-store > guaranteed to work. Please read https://gcc.gnu.org/wiki/FAQ#PR323 > > (If there is something that is not explained there, it would be better to > expand the answer rather than reply here with bits of info.) Thanks for the link. However -in my case- the compile option `-fexcess-precision=standard` does produce the same code as `-ffloat-store`. At least for [...] double div; /* OPJ_FLOAT64 */ div = dd / dr; if (div >= thresh) [...] Is there a longer description for `-fexcess-precision=standard` which explains case of failures ? Thanks again,
