Intel Itanium 9150M, Manual, Page: 202 / 420

Volume 3: Instruction Reference 3:193
nop
nop — No Operation
Format: (
qp
) nop
imm
21
pseudo-op
(
qp
) nop.i
imm
21
i_unit_form I18
(
qp
) nop.b
imm
21
b_unit_form B9
(
qp
) nop.m
imm
21
m_unit_form M48
(
qp
) nop.f
imm
21
f_unit_form F16
(
qp
) nop.x
imm
62
x_unit_form X5
Description:
No operation is done.
The immediate,
imm
21
or
imm
62
, can be used by software as a marker in program code. It
is ignored by hardware.
For the x_unit_form, the L slot of the bundle contains the upper 41 bits of
imm
62
.
A
nop.i
instruction may be encoded in an MLI-template bundle, in which case the L slot
of the bundle is ignored.
This instruction has five forms, each of which can be executed only on a particular
execution unit type. The pseudo-op can be used if the unit type to execute on is
unimportant.
Operation: if (PR[ qp ]) {
; // no operation
}
Interruptions:
None