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-semantic: 0.974
-instruction: 0.931
-other: 0.732
-mistranslation: 0.299
-
-x86 SSE/SSE2/SSE3 instruction semantic bugs with NaN
-
-Description of problem
-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.
-
-Steps to reproduce
-
-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");
-}
-
-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 information
-This bug is discovered by research conducted by KAIST SoftSec.