SB
Speculation Barrier
Speculation Barrier is a barrier that controls speculation.
For more information and details of the semantics, see
Speculation Barrier (SB).
For more information about the CONSTRAINED UNPREDICTABLE behavior of this instruction, see Architectural Constraints on UNPREDICTABLE behaviors.
It has encodings from the following instruction sets:
A32 (
A1
)
and
T32 (
T1
)
.
1
1
1
1
0
1
0
1
0
1
1
1
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(0)
(0)
(0)
(0)
0
1
1
1
(0)
(0)
(0)
(0)
SB{<q>}
// No additional decoding required
1
1
1
1
0
0
1
1
1
0
1
1
(1)
(1)
(1)
(1)
1
0
(0)
0
(1)
(1)
(1)
(1)
0
1
1
1
(0)
(0)
(0)
(0)
SB{<q>}
if InITBlock() then UnpredictableProcedure(); end;
<q>
See Standard assembler syntax fields.
if ConditionPassed() then
EncodingSpecificOperations();
SpeculationBarrier();
end;
2026-03-26 20:27:25
2026-03_rel