3:356
Volume 3: Instruction Formats
4.5.3.2
Break/Nop/Hint (B-Unit)
4.6
F-Unit Instruction Encodings
The floating-point instructions are encoded in major opcodes 8 – E for floating-point
and fixed-point arithmetic, opcode 4 for floating-point compare, opcode 5 for
floating-point class, and opcodes 0 and 1 for miscellaneous floating-point instructions.
The miscellaneous and reciprocal approximation floating-point instructions are encoded
within major opcodes 0 and 1 using a 1-bit opcode extension field (x) in bit 33 and
either a second 1-bit extension field in bit 36 (q) or a 6-bit opcode extension field (x
6
)
in bits 32:27.
shows the 1-bit x assignments,
shows the
additional 1-bit q assignments for the reciprocal approximation instructions;
summarize the 6-bit x
6
assignments.
vmsw.0
0
18
vmsw.1
19
40
37 36 35
33 32
27 26 25
6 5
0
i
x
6
imm
20a
qp
4
1
3
6
1
20
6
Instruction
Operands
Opcode
Extension
x
6
break.b
imm
21
00
nop.b
hint.b
01
Table 4-59.
Miscellaneous Floating-point 1-bit Opcode Extensions
Opcode
Bits 40:37
x
Bit 33
0
6-bit Ext (
1
Reciprocal Approximation (
0
6-bit Ext (
1
Reciprocal Approximation (
Instruction
Opcode
Extension
x
6
Содержание Itanium 9150M
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Страница 301: ...3 292 Volume 3 Pseudo Code Functions Intel Itanium Architecture Software Developer s Manual Rev 2 3...
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Страница 406: ...3 397 Intel Itanium Architecture Software Developer s Manual Rev 2 3 Index...
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Страница 419: ...INDEX Index 12 Index for Volumes 1 2 3 and 4...
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