Huoke opened a new issue, #2489:
URL: https://github.com/apache/brpc/issues/2489
**Describe the bug (描述bug)**
```c++
inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr, Atomic32
increment)
{
Atomic32 temp = increment;
__asm__ __volatile__("lock; xaddl %0,%1"
: "+r" (temp), "+m" (*ptr)
: : "memory");
// temp now holds the old value of *ptr
if (AtomicOps_Internalx86CPUFeatures.has_amd_lock_mb_bug) {
__asm__ __volatile__("lfence" : : : "memory");
}
return temp + increment;
}
```
上面的代码中内联汇编原子交换和相加，temp保存的是旧的*ptr中的值，那么*ptr中保存的是不是相加后的值？
内联汇编这里的输出操作数这里看不懂，求解惑
**To Reproduce (复现方法)**
null
**Expected behavior (期望行为)**
**Versions (各种版本)**
OS:
Compiler:
brpc: 1.0.0-rc02
protobuf:
**Additional context/screenshots (更多上下文/截图)**
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