Intel Itanium 9150M, Manual

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3:368 Volume 3: Instruction Formats
4.7.3.2 Long Call
X4
4.7.4 Nop/Hint (X-Unit)
X-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 4-73 . These
instructions are executed by an I-unit.
X5
4.8 Immediate Formation
Table 4-74 shows, for each instruction format that has one or more immediates, how
those immediates are formed. In each equation, the symbol to the left of the equals is
the assembly language name for the immediate. The symbols to the right are the field
names in the instruction encoding.
40 37 36 35 34 3332 1312 11 9 8 6 5 0 40 2 1 0
D i d wh imm
20b
p b
1
qp imm
39
4 1 1 2 20 1 3 3 6 39 2
Instruction Operands Opcode
Extension
p wh d
brl.call. bwh . ph . dh
e l
b
1
= target
64
D
See Table 4-51
on page 3:351
See Table 4-52
on page 3:352
See Table 4-54
on page 3:352
Table 4-73. Misc X-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.x
1 hint.x
40 37 36 35 33 32 27 2625 6 5 0 40 0
0 i x
3
x
6
y imm
20a
qp imm
41
4 1 3 6 1 20 6 41
Instruction Operands Opcode
Extension
x
3
x
6
y
nop.x
imm
62
0 0 01
0
hint.x 1
Table 4-74. Immediate Formation
Instruction
Format
Immediate Formation
A2
count
2
= ct
2d
+ 1
A3 A8 I27 M30
imm
8
= sign_ext(s << 7 | imm
7b
, 8)
A4
imm
14
= sign_ext(s << 13 | imm
6d
<< 7 | imm
7b
, 14)
A5
imm
22
= sign_ext(s << 21 | imm
5c
<< 16 | imm
9d
<< 7 | imm
7b
, 22)
A10
count
2
= (ct
2d
> 2) ? reservedQP
a
: ct
2d
+ 1
I1
count
2
= (ct
2d
== 0) ? 0 : (ct
2d
== 1) ? 7 : (ct
2d
== 2) ? 15 : 16