SERIALIZE

SERIALIZE — Serialize Instruction Execution

Opcode/ Instruction	Op/ En	64/32 bit Mode Support	CPUID Feature Flag	Description
NP 0F 01 E8 SERIALIZE	ZO	V/V	SERIALIZE	Serialize instruction fetch and execution.

Instruction Operand Encoding

Op/En	Tuple	Operand 1	Operand 2	Operand 3	Operand 4
ZO	N/A	N/A	N/A	N/A	N/A

Description

Serializes instruction execution. Before the next instruction is fetched and executed, the SERIALIZE instruction ensures that all modifications to flags, registers, and memory by previous instructions are completed, draining all buffered writes to memory. This instruction is also a serializing instruction as defined in the section “Serializing ® Instructions” in Chapter 11 of the Intel 64 and IA-32 Architectures Software Developer’s Manual, Volume 3A.

SERIALIZE does not modify registers, arithmetic flags, or memory.

Operation

Wait_On_Fetch_And_Execution_Of_Next_Instruction_Until(preceding_instructions_complete_and_preceding_stores_globally_visible);

Intel C/C++ Compiler Intrinsic Equivalent

SERIALIZE void _serialize(void);

SIMD Floating-Point Exceptions

None.

Other Exceptions

#UD If the LOCK prefix is used. If CPUID.07H.00H:EDX.SERIALIZE[14] = 0.

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Source: Intel® 64 and IA-32 Architectures Software Developer's Manual, Combined Volumes (Order Number 325462-091US, March 2026)
Generated: 7-6-2026