🚀 go-pugleaf

In article <31814@ames.arc.nasa.gov> lamaster@ames.arc.nasa.gov (Hugh LaMaster) writes:
>>Along a similar line, the Convex machines cache accesses going to the
>>scalar unit only.  The load/store unit for the vector unit operates
>>directly from main memory to the vector registers.  This is pretty
>
>This is one of the advantages of having
>a vector instruction set, because this is *exactly* what is needed for
>programs of this type.  

What you should have said is: "This is one of the advantages of having
control over whether or not to bypass the cache". A vector instruction
set gives a pretty coarse method of making the choice.

Another point worth noting is that many vector machines only do the
cache bypass if the stride = 1, other strides may go for the cache.
It depends, of course, on how good the memory system is.

pkr