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+id = 1373
+title = "x86 ADOX and ADCX semantic bug"
+state = "closed"
+created_at = "2022-12-16T06:58:59.266Z"
+closed_at = "2023-02-24T15:06:58.959Z"
+labels = ["Closed::Fixed", "accel: TCG", "target: i386"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1373"
+host-os = "Windows 10 20H2"
+host-arch = "x86"
+qemu-version = "7.1.90 (v7.2.0-rc0)"
+guest-os = "None"
+guest-arch = "x86"
+description = """The result of instruction ADOX and ADCX are different from the CPU. The value of one of EFLAGS is different."""
+reproduce = """1. Compile this code
+```
+void main() {
+    asm("push 512; popfq;");
+    asm("mov rax, 0xffffffff84fdbf24");
+    asm("mov rbx, 0xb197d26043bec15d");
+    asm("adox eax, ebx");
+}
+```
+2. Execute and compare the result with the CPU. This problem happens with ADCX, too (with CF).
+    - CPU
+        - OF = 0
+    - QEMU
+        - OF = 1"""
+additional = """This bug is discovered by research conducted by KAIST SoftSec."""