Re: Cray style vectors

Michael S <already5chosen@yahoo.com> writes:

As discussed here just recently, there are good reason to avoid
'unsigned' array indices in performance-oriented programs running under
IL32P64 or I32LP64 C environments. Everything else is preferable -
int, ptrdiff_t, size_t.

If Fortran makes unsigned overflow illegal, Fortran compilers can
perform the same shenanigans for unsigned that C compilers do for
signed integers; so if signed int really is preferable because of
these shenanigans, unsigned with the same shenanigans would be
preferable, too.

In general, I think that undersized ints (as in I32LP64 or IL32P64)
are always at a disadvantage; some architectures (particularly ARM
A64) go to extra lengths to compensate for these disadvantages, but I
don't think that these measures eliminates it completely, and the
additional effort in the architectures could have gone to better uses.

- anton
--
'Anyone trying for "industrial quality" ISA should avoid undefined behavior.'
  Mitch Alsup, <c17fcd89-f024-40e7-a594-88a85ac10d20o@googlegroups.com>