Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1218

Table 4-25.
Opcode
Bits
40:37
0
4.3.4.1 Nop/Hint (I-Unit)
I-unit nop and hint instructions are encoded within major opcode 0 using a 3-bit opcode
extension field in bits 35:33 (x
a 1-bit opcode extension field in bit 26 (y), as shown in
Table 4-26.
Opcode
Bits 40:37
0
40
I18
Instruction
i
nop.i
hint.i
Volume 3: Instruction Formats
Misc I-Unit 6-bit Opcode Extensions
x
3
Bits
Bits
35:33
30:27
0
0 break.i
1 1-bit Ext (Table
2
3
4
5
6
7
0
8
9
A mov.i to ar – imm
B
C
D
E
F
Misc I-Unit 1-bit Opcode Extensions
x
3
Bits 35:33 Bits 32:27
0
37 36 35 33 32
0 i x x
3 6
4 1 3 6
Operands
imm
21
x
6
Bits 32:31
1
I19 zxt1 I29
4-26) zxt2 I29
zxt4 I29
sxt1 I29
sxt2 I29
sxt4 I29
czx1.l I29
czx2.l I29
I27
8
czx1.r I29
czx2.r I29
), a 6-bit opcode extension field in bits 32:27 (x
3
x y
6
Bit 26
0
01
1
27 26 25
y imm
1
Opcode
0
2
mov from ip
mov from b
mov.i from ar
mov from pr
mov.i to ar I26
Table 4-26.
nop.i
hint.i
6 5
20a
20
Extension
x x y
3 6
0
0 01
1
3
I25
I22
I28
I25
), and
6
0
qp
6
3:319