Cray CRAY-1 - Elements) to VI Elements; 170 Ijk Floating Sums of (Sj) and (Vk Elements) to; VI Elements; 172 Ijk Floating Differences of (Sj) and (Vk Elements) to

170ijk
171ijk
172ijk
173ijk
Floating
sums of (Sj) and (Vk elements) to Vi
elements
Floating
sums of (Vj elements) and (Vk elements) to
Vi elements
Floating differences of (Sj)
and (Vk elements) to
Vi elements
Floating differences of
(Vj elements) and (Vk
elements) to Vi elements
1----------------------------------------------------------------------
These instructions are executed by the floating point add unit.
Instructions 170 and 171 perform floating point addition; instructions
172 and 173 perform floating point subtraction. The number of additions
or subtractions performed
by an instruction 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 Vi. The results are normalized
even if the operands are unnormalized.
Instructions
170 and 172 deliver (Sj) to the functional unit for each
operation as
one of the operands. The other operand is an element of
Vk. For instructions 171 and 173, both operands are obtained from V
registers.
Out of range conditions are described in Section 3.
Hold issue conditions
034 - 037 in process
Exchange in process
Vi or Vk reserved
170 - 173 in process, unit busy (VL) + 4 CPs
For 170, 172:
Sj reserved
For 171, 173:
Vj reserved
2240004
4-66
E