Okay, so I'm trying to figure out what category this bug falls into. The user provided some information about an illegal instruction happening when running a test case on QEMU using AArch64. They mentioned specific intrinsics like vqmovunh_s16 and others that are being compiled into SQXTUN instructions with different data sizes (B, H, S). The problem is that these instructions aren't supported by QEMU, leading to an illegal instruction error when the test runs. I remember that in QEMU, if it doesn't recognize certain instructions, it throws an error because those instructions aren't implemented yet. Looking at the categories given: instruction, syscall, runtime. Since the issue arises from specific ARMv8 instructions not being handled by QEMU, this seems to be related to how QEMU processes these particular instructions. It's not a problem with system calls or something that happens during normal runtime operations beyond handling instructions. So, it must fall under the 'instruction' category because it's about QEMU not supporting certain ARMv8 instructions, which leads to an illegal instruction error. The issue pertains to specific ARMv8 instructions (SQXTUN) not being supported by QEMU, causing an illegal instruction error. This is directly related to how QEMU handles these instructions. instruction