Pointer mapping between real and complex arrays

[ivanpribec]

@septc

In the above code, does rr.span = 16 mean that Gfortran represents the array pointer for the real parts as something like a stride-1 array with 8-byte padding between elements? If so, is_contiguous() should be modified as stride == 1 && span == elem_len or similar…?

The descriptor contents can be found here: gcc/libgfortran/libgfortran.h at 70999668a1305571d3b5fc57168fcb060a976418 · gcc-mirror/gcc · GitHub

Looking at the commit message that introduced .span it is a property set only for pointer arrays. Skimming through the source, it looks like the array assignment a => c gets handled by gfc_conv_expr_descriptor which internally calls gfc_get_array_span: gcc/gcc/fortran/trans-array.cc at 70999668a1305571d3b5fc57168fcb060a976418 · gcc-mirror/gcc · GitHub