XSUSLDTRK

XSUSLDTRK — Suspend Tracking Load Addresses

Opcode/ Instruction	Op/ En	64/32 bit Mode Support	CPUID Feature Flag	Description
F2 0F 01 E8 XSUSLDTRK	ZO	V/V	TSXLDTRK	Specifies the start of an Intel TSX suspend read address tracking region.

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

The instruction marks the start of an Intel TSX (RTM) suspend load address tracking region. If the instruction is used inside a transactional region, subsequent loads are not added to the read set of the transaction. If the instruction is used inside a suspend load address tracking region it will cause transaction abort.

If the instruction is used outside of a transactional region it behaves like a NOP. ® Chapter 16, “Programming with Intel® Transactional Synchronization Extensions‚” in the Intel 64 and IA-32 ® Architectures Software Developer’s Manual, Volume 1 provides additional information on Intel TSX Suspend Load Address Tracking.

Operation

XSUSLDTRK

IF RTM_ACTIVE = 1:
    IF SUSLDTRK_ACTIVE = 0:
        SUSLDTRK_ACTIVE ← 1
    ELSE:
        RTM_ABORT
ELSE:
    NOP

Flags Affected

None.

Intel C/C++ Compiler Intrinsic Equivalent

XSUSLDTRK void _xsusldtrk(void);

SIMD Floating-Point Exceptions

None.

Other Exceptions

#UD If CPUID.07H.00H:EDX.TSXLDTRK[16] = 0. If the LOCK prefix is used.

---

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