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.)
Cheers, Manuel.
