Inquiry About PC-Relative Code Generation in QEMU

[Coekjan Yip]

Dear QEMU Community,

I hope this message finds you well.

I recently started studying the QEMU TCG code, and I have noticed that QEMU
seems to support generating PC-Relative Code (`CF_PCREL`), but this feature
seems currently enabled only for System Emulation in version 9.1.0, while it
is not available for User Emulation. Could you please clarify if there are
specific functionality or performance considerations behind this decision?
Additionally, if this feature were to be enabled for User Emulation, could we
consider the code generated by QEMU as Position-Independent Code (PIC)?
Thank you for your assistance.

Best regards,
Yip Coekjan