xsusldtrk

Suspend Tracking Load Addresses

XSUSLDTRK

Suspends tracking of load addresses in a TSX suspend-tracking region (resumed with XRESLDTRK).

Pseudocode Operation

if (in_transaction) {
  TSX_load_tracking_enabled ← !TSX_load_tracking_enabled
}

Encoding

Binary Layout

Format Legacy

Opcode F2 0F 01 E8

Extension TSXLDTRK

Operands

Reference

View in Intel® 64 and IA-32 Architectures SDM ↗ Intel® SDM

Instruction Forms

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

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

Intel C/C++ Compiler Intrinsic Equivalent

XSUSLDTRK void _xsusldtrk(void);

Flags Affected

None.

Exceptions

SIMD Floating-Point Exceptions