Nintendo Ultra64 Programmer's Manual page 288

Operation:

T:
for i in 0...7
endfor
Exceptions:
None
288
if (e = 0000) then /* vector operand */
3...0
j  i
elseif ((e & 1110) = 0010) then /* scalar quarter of vector */
3...0
j  (e
& 0001) + (i & 1110)
3...0
elseif ((e & 1100) = 0100) then /* scalar half of vector */
3...0
j  (e
& 0011) + (i & 1100)
3...0
elseif ((e & 1000) = 1000) then /* scalar whole of vector */
3...0
j  (e
& 0111)
3...0
endif
 VR[vs][i*2]
product
31...0
 product
ACC
47...16 30...0
 ACC
ACC
47...0 47...0
 Clamp_Unsigned(ACC
VR[vd][i*2]
15...0
* VR[vt][j*2]
15...0 15...0
|| 0
15
+ (1 || 0 )
31...16
)