Cray CRAY-1 - Page 123

The 050 instruction is intended for merging portions of 64-bit words
into a composite word. Bits of Si are cleared when the corresponding
bits of Sk are one if the j designator is zero and the k designator is
nonzero. The sign bit of (Sj) replaces the sign bit of Si if the j
designator
is nonzero and the k designator is zero. The sign bit of
Si is cleared if the j and k designators are both zero.
The 051 instruction forms the logical sum (inclusive OR) of (Sj) and
(Sk) and enters the result into Si. Bits of Si are set when one of
the corresponding
bits of (Sj) and (Sk) is set as in the following example:
(Sj) = 1 1 0 0
(Sk) = 1 0 1 0
(Si) = 1 1 1 0
(Sj)
is transmitted to Si if the j and k designators have the same
nonzero value. (Sk) is transmitted to Si if the j designator is zero
and the k designator is nonzero. (Sj) with the sign bit set to one
is transmitted to Si if the j designator is nonzero and the k designator
is zero. A ones mask consisting of only the sign bit is entered into
Si if the j and k designators are both zero.
Hold issue conditions
034 - 037 in process
Exchange in process
S register access conflict
Si, Sj, and Sk reserved
Execution
time
Si ready 1 CP
Instruction issue 1 CP
Special cases
(Sj) = 0 if j = 0
(Sk) = 2
63
if k = 0
2240004
4-37
E