모두의 코드
XTEST (Intel x86/64 assembly instruction)
XTEST
Test If In Transactional Execution
참고 사항
아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.
Opcode/Instruction | Op/ | 64/32bit | CPUID | Description |
|---|---|---|---|---|
| A | V/V | HLE or RTM | Test if executing in a transactional region |
Instruction Operand Encoding
Op/En | Operand 1 | Operand2 | Operand3 | Operand4 |
|---|---|---|---|---|
A | NA | NA | NA | NA |
Description
The XTEST instruction queries the transactional execution status. If the instruction executes inside a transaction-ally executing RTM region or a transactionally executing HLE region, then the ZF flag is cleared, else it is set.
Operation
XTEST
IF (RTM_ACTIVE = 1 OR HLE_ACTIVE = 1)
THEN
ZF <- 0
ELSE
ZF <- 1
FI;
Flags Affected
The ZF flag is cleared if the instruction is executed transactionally; otherwise it is set to 1. The CF, OF, SF, PF, and AF, flags are cleared.
Intel C/C++ Compiler Intrinsic Equivalent
XTEST : int _xtest(void);
SIMD Floating-Point Exceptions
None
Other Exceptions
#UD CPUID.(EAX=7, ECX=0):HLE[bit 4] = 0 and CPUID.(EAX=7, ECX=0):RTM[bit 11] = 0.
If LOCK or 66H or F2H or F3H prefix is used.
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