CSDB Consumption of Speculative Data Barrier Consumption of Speculative Data Barrier is a memory barrier that controls speculative execution arising from data value prediction. For more information and details of the semantics, see Consumption of Speculative Data Barrier (CSDB). For more information about the CONSTRAINED UNPREDICTABLE behavior, see Architectural Constraints on UNPREDICTABLE behaviors. It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) . != 1111 0 0 1 1 0 0 1 0 0 0 0 0 (1) (1) (1) (1) (0) (0) (0) (0) 0 0 0 1 0 1 0 0 CSDB{<c>}{<q>} if cond != '1110' then UnpredictableProcedure(); end; // CSDB must be encoded with AL condition cond != '1110' 1 1 1 1 0 0 1 1 1 0 1 0 (1) (1) (1) (1) 1 0 (0) 0 (0) 0 0 0 0 0 0 1 0 1 0 0 CSDB{<c>}{<q>} if InITBlock() then UnpredictableProcedure(); end; InITBlock() <c> See Standard assembler syntax fields. <q> See Standard assembler syntax fields. if ConditionPassed() then EncodingSpecificOperations(); ConsumptionOfSpeculativeDataBarrier(); end; 2026-03-26 20:27:25 2026-03_rel