Cray CRAY-1 - Page 25

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operands or

one

scalar

and

one

vector

register

as

operands. Exceptions are

vector

shifts,

vector

reciprocal,

and

the load or

store

instructions.

Since

many

vectors exceed

64

elements, a

long

vector

is

processed

as

one

or

more

64-element

segments

and

a possible remainder of less than

64

elements. Generally,

it

is

convenient to

compute

the remainder

and

process

this

short

segment

before processing the remaining

number

of 64-element

segments;

however,

a

programmer

may

choose

to construct the vector

loop

code

in

any

of a

number

of

ways.

The

processing of long vectors in

FORTRAN

is

handled

by

the compiler

and

is

transparent to the

programmer.

2240004

1-7

E

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