[Sbcl-devel] Restriction on constant TNs on x86 and x86-64.

[Paul K. <pv...@pv...>]

In emit-ea ($ARCH/insts.lisp), we can find:

        (unless allow-constants
          (error
           "Constant TNs can only be directly used in MOV, PUSH, and CMP."))

I don't think that's still true. As far as I can tell, this used to be true back when gencgc sniffed code objects on relocation (that code could only handle mov, push, cmp and lea). Now that we have a relocation table on x86 and RIP-relative addressing on x86-64, we could allow constants everywhere.

Paul Khuong