| Opcode/Instruction | Op/En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
|---|---|---|---|---|
| F2 0F 01 E9 XRESLDTRK | ZO | V/V | TSXLDTRK | Specifies the end 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 end of an Intel TSX (RTM) suspend load address tracking region. If the instruction is used inside a suspend load address tracking region it will end the suspend region and all following load addresses will be added to the transaction read set. If this instruction is used inside an active transaction but not in a suspend 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
XRESLDTRK
IF RTM_ACTIVE = 1:
IF SUSLDTRK_ACTIVE = 1:
SUSLDTRK_ACTIVE := 0
ELSE:
RTM_ABORT
ELSE:
NOP
Flags Affected
None.
Intel C/C++ Compiler Intrinsic Equivalent
XRESLDTRK void _xresldtrk(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. |