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+id = 1370
+title = "x86 BLSI and BLSR semantic bug"
+state = "closed"
+created_at = "2022-12-16T06:35:03.247Z"
+closed_at = "2023-02-16T13:09:22.665Z"
+labels = ["Closed::Fixed", "accel: TCG", "target: i386"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1370"
+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 BLSI and BLSR is different from the CPU. The value of CF is different."""
+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 = """This bug is discovered by research conducted by KAIST SoftSec."""