Assorted internals tidbits

Compiler backend

VINSN   Virtual instruction (probably akin to SBCL's VOPs)

Assembler

<-    copy register
@     label
@=    label (aligned)
->    jump to label
^     branch
?     register (unwired)
$     register (wired)

!     ?
%     calculate effective address?

(from compiler/X86/X862.lisp)