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.(EAX=7, ECX=0):EDX.TSXLDTRK[bit 16] = 0.
If the LOCK prefix is used.

This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be incomplete or broken in various obvious or non-obvious ways. Refer to Intel® 64 and IA-32 Architectures Software Developer’s Manual for anything serious.