Re: Cray style vectors

Thomas Koenig wrote:

Anton Ertl <anton@mips.complang.tuwien.ac.at> schrieb:

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.

One problem is that, without 2^n modulo, something like a
multiplicative hash would be illegal.

In HW we can reverse the bit order of the fields at zero cost making
hashes that "whiten" the data better.

People would do it anyway, ignoring the prohibition, because it
is so useful, and subsequent hilarity will ensue.