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+id = 1375
+title = "x86 SSE/SSE2/SSE3 instruction semantic bugs with NaN"
+state = "opened"
+created_at = "2022-12-16T07:49:50.158Z"
+closed_at = "n/a"
+labels = ["Softfloat", "accel: TCG", "target: i386", "workflow::Triaged"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1375"
+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 SSE/SSE2/SSE3 instructions with NaN is different from the CPU. From Intel manual Volume 1 Appendix D.4.2.2, they defined the behavior of such instructions with NaN. But I think QEMU did not implement this semantic exactly because the byte result is different."""
+reproduce = """1. Compile this code
+```
+void main() {
+    asm("mov rax, 0x000000007fffffff; push rax; mov rax, 0x00000000ffffffff; push rax; movdqu XMM1, [rsp];");
+    asm("mov rax, 0x2e711de7aa46af1a; push rax; mov rax, 0x7fffffff7fffffff; push rax; movdqu XMM2, [rsp];");
+    asm("addsubps xmm1, xmm2");
+}
+```
+2. Execute and compare the result with the CPU. This problem happens with other SSE/SSE2/SSE3 instructions specified in the manual, Volume 1 Appendix D.4.2.2.
+    - CPU
+        - xmm1[3] = 0xffffffff
+    - QEMU
+        - xmm1[3] = 0x7fffffff"""
+additional = """This bug is discovered by research conducted by KAIST SoftSec."""