Cray CRAY-1 - Page 138

(Sj) or (Vj element) =
1 100
(Vk element)
(Vi element)
= 1 0 1 0
= 1 0 0 C
The 142 and 143 instructions form the logical sums (inclusive OR) of
pairs of operands
and deliver the results to Vi. Bits of an element
of
Vi are set to one when one of the corresponding bits of (Sj) or
(Vj element) and (Vk element) is one as in the following:
(Sj)
or
(Vi
element)
=
1 1
0
C
",I
(Vk
e'1 el11ent)
=
1 0 1 C
(Vi
element)
=
1 1 1 0
The 144 and 145 instructions form the logical differences (exclusive
OP) of pairs of operands and deliver the results to Vi. Bits of an
element are set to one when the corresponding bit of (Sj) or (Vj
element) are different from (Vk,element) as in the following:
(Sj) or
(Vj element) = 1 1 0 0
(Vk element) = 1 0 1 0
(Vi element) = 0 lIe
The 146 and 147 instructions transmit operands to Vi depending on the
contents of the vector
mask register (VM). Bit 0 of the mask
corresponds to element 0 of a V register. Bit 63 corresponds to
element
63. Operand pairs used for the selection depend on the
instruction. For the 146 instructions, the first operand is al~Jays
(Sj), the second operand is (Vk element). For the 147 instruction,
the first operand is (Vj element) and the second operand is (Vk
element). If bit n of the vector mask is one, the first operand is
transwitted; if bit n of the mask is zero, the second operand (Vk
element) is selected.
2240004
4-52
E