Intel Itanium 9150M, Manual

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