Cray CRAY-1 - Page 113

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1
I
: 030ijk Integer sum of (Aj) and (Ak) to Ai
1
: 031ijk Integer difference (Aj) and (Ak) to Ai 1
1 1
1 ______ ----------------------------------------------- ______________ _
These instructions are executed in the address add unit.
The 030 instruction forms the integer sum of (Aj) and (Ak) and enters
the
result into Ai. No overflow is detected.
The 031 instruction forms the integer difference of (Aj) and (Ak) and
enters the result into Ai. No overflow is detected.
Hold issue conditions
034 - 037 in process
Exchange in process
A
register access conflict
Ai, Aj, or Ak reserved
Execution time
Instruction issue 1
CP
Ai ready 2 CPs
SEecial
cases
For 030:
(Ai)= (Ak)
if j
=
o and
(A i) = 1
if j
=
o and
( Ai) = (,olj) + 1
if j
f
o and
For 031:
(Ai)=-(Ak)
if j
=
o and
(Ai)= -1
if j
=
0
and
( Ai) = (Aj) -1
if j
f
0
and
2240004
k f 0
k = 0
k = 0
k f 0
k = 0
k = 0
4-27
E