SV* new_sv_from_float_buffer(void* buffer, int i) {
    return newSVnv( (double)(((float*)buffer)[i]) );
}

...

{
    SV* (*new_sv_from_buffer)(void*, int);
    if ( fmt == 3 && bps == 32 ) {
        new_sv_from_buffer = &new_sv_from_float_buffer;
    }
    ...

    ... Call new_sv_from_buffer repeatedly ...
}