mgorny added a comment. To explain a bit, `PT_SETXMMREGS` exists because originally `PT_SETFPREGS` used FSAVE format on i386, and this format didn't support setting XMM registers. Newer CPUs support FXSAVE instead, and this is exposed via `PT_SETFPREGS` on amd64 and `PT_SETXMMREGS` on i386.
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