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x86 BLSI and BLSR semantic bug
Description of problem:
The result of instruction BLSI and BLSR is different from the CPU. The value of CF is different.
Steps to reproduce:
1. Compile this code
```
void main() {
asm("blsi rax, rbx");
}
```
2. Execute and compare the result with the CPU. The value of `CF` is exactly the opposite. This problem happens with BLSR, too.
Additional information:
This bug is discovered by research conducted by KAIST SoftSec.
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