| 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. |
| 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 instruc-tion 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 Archi-tectures 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. |