sb
Speculation Barrier
SB
Prevents speculative execution across the barrier.
Details
Speculation Barrier. Prevents speculative execution from proceeding past this instruction. Acts as a full serializing barrier for speculative load operations; no younger instruction can execute until all older instructions have completed. Does not affect condition flags. AArch64-only; no privilege requirement.
Pseudocode Operation
SpeculationBarrier()Example
SB
Encoding
Binary Layout
11010101000000110011
0000
1
11
11111
Operands
Reference (Arm A64 ISA)
Instruction Forms
| Encoding | Instruction | ISA | Bit pattern | ||
|---|---|---|---|---|---|
| 0xD50330FF | SB | A64 | 11010101000000110011 | 0000 | 1 | 11 | 11111 |
Description
Speculation Barrier is a barrier that controls speculation. For more information and details of the semantics, see Speculation Barrier (SB).
Operation
SpeculationBarrier();