Cray CRAY-1 - Page 155

Special cases
(Vi element) is meaningless if (Vj element) is not normalized;
the
unit assumes that bit 247 of (Vj element) is one; no test
of this bit is made.
Arithmetic error allows a minimum of 21 CP + 2 parcels and
a maximum of (VL) + 20 CP + 2 parcels to issue before
interrupt occurs if f.p. error flag set.
If the Vector Population Instructions Option is installed, the k
field becomes relevant and allows recognition of the 174ij1 and
174ij2 instructions. When this option is installed, the k field
must be 0 for the floating point reciprocal approximation instruc-
tion.
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E