Cray CRAY-1 - To VI Elements

154ijk
155ijk
156ijk
157ijk
Integer
sums of (Sj) and (Vk elements) to Vi elements
Integer
sums of (Vj elements) and (Vk elements) to
Vi elements
Integer differences of
(Sj) and (Vk elewents) to
Vi elements
Integer differences of
(Vj elements) and (Vk elements)
to
Vi elements
These instructions are executed by the vector add unit.
Instructions 154 and 156 perform integer addition. Instructions 155
and 157 perform integer subtraction. The number of additions or
subtra~tions performed is determined by the contents of the VL register.
All operations start with element zero of the V registers and increment
the element
number by one for each operation performed. All results
are delivered to elements of Vi. No overflow is detected.
Instructions
154 and 156 deliver (Sj) to the functional unit as one
of the operands for each operation. The other operand is an element
of
Vk. For instructions 155 and 157, both operands are obtained from
V registers.
Hold issue conditions
034 - 037 in process
Exchange in process
Vi or Vk reserved
154 - 157 in process, unit busy (VL) + 4 CPs
For 154 and 156 only, Sj reserved
For 155 and 157 only, Vj reserved
2240004
4-61
E