image/svg+xml XEND — Transactional End Instruction Operand Encoding Description The instruction marks the end of an RTM code region. If this corresponds to the outermost scope (that is, including this XEND instruction, the number of XBEGIN instructions is the same as number of XEND instructions), the logical processor will attempt to commit the logical processor state atomically. If the commit fails, the logical processor will rollback all architectural register and memory updates performed during the RTM execution. The logical processor will resume execution at the fallback address computed from the outermost XBEGIN instruction. The EAX register is updated to reflect RTM abort information. XEND executed outside a transactional region will cause a #GP (General Protection Fault). Operation XEND IF (RTM_ACTIVE = 0) THEN SIGNAL #GP ELSE RTM_NEST_COUNT-- IF (RTM_NEST_COUNT = 0) THEN Try to commit transaction IF fail to commit transactional execution THEN GOTO RTM_ABORT_PROCESSING; ELSE (* commit success *) RTM_ACTIVE := 0 FI; FI; FI; (* For any RTM abort condition encountered during RTM execution *) RTM_ABORT_PROCESSING: Restore architectural register state Discard memory updates performed in transaction Update EAX with status RTM_NEST_COUNT := 0 RTM_ACTIVE := 0 IF 64-bit Mode THEN RIP := fallbackRIP ELSE EIP := fallbackEIP FI; END Opcode/InstructionOp/ En 64/32bit Mode Support CPUID Feature Flag Description NP 0F 01 D5 XEND AV/VRTMSpecifies the end of an RTM code region. Op/EnOperand 1Operand2Operand3Operand4 ANANANANA image/svg+xml Flags Affected None Intel C/C++ Compiler Intrinsic Equivalent XEND:void _xend( void ); SIMD Floating-Point Exceptions None Other Exceptions #UDCPUID.(EAX=7, ECX=0):EBX.RTM[bit 11] = 0. If LOCK prefix is used. #GP(0)If RTM_ACTIVE = 0. This UNOFFICIAL reference was generated from the official Intel® 64 and IA-32 Architectures Software Developer’s Manual by a dumb script. There is no guarantee that some parts aren't mangled or broken and is distributed WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE .