https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117805
--- Comment #7 from kargls at comcast dot net --- (In reply to Richard Biener from comment #3) > You can get the desired behavior with -fno-signed-zeros I think - it might > be reasonable to add an additional -fcx-* flag specifying that just for > _Complex > operations signed zeros can be ignored (IIRC non-complex REAL have specified > behavior wrt signed zeros, so a -fno-signed-zeros default for Fortran would > be wrong). > > So, -fcx-no-signed-zeros or maybe simply alter -fcx-fortran-rules to cover > signed zeros? It my opinion that -fcx-fortran-rules should be removed. It's exist does match anything specified in the Fortran standard. But that's for another PR. It is more than just adding a new option. program testprogram implicit none real, parameter :: rc = sign(0., -1.) complex, parameter :: zc = nzero * (0, 1) real r complex z print *, rc, zc r = sign(0., -1.) z = r * (0, 1) print *, r, z end program % gfcx -o z -O a.f90 && ./z -0.00000000 (-0.00000000,0.00000000) -0.00000000 (-0.00000000,0.00000000) % gfcx -o z -Ofast a.f90 && ./z -0.00000000 (-0.00000000,0.00000000) -0.00000000 (-0.00000000,-0.00000000)
