Clear branch history
This instruction clears the branch history for the current context to the extent that branch history information created before the CLRBHB instruction cannot be used by code before the CLRBHB instruction to exploitatively control the execution of any indirect branches in code in the current context that appear in program order after the instruction.
Variants: FEAT_CLRBHB (ARMv8.9)
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 |
| CRm | op2 | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CLRBHB
if !IsFeatureImplemented(FEAT_CLRBHB) then EndOfDecode(Decode_NOP);
Hint_CLRBHB();