anchor.diff:  ;;;
   ;;; Instruction DOUBLE-FLOAT-AREF-INSTRUCTION.
   ;;;
  -;;; This instruction takes a two inputs.  The first input is assumed
  +;;; This instruction takes two inputs.  The first input is assumed
   ;;; to be an array specialized to DOUBLE-FLOAT.  The second is assumed
   ;;; to be a FIXNUM and represents the index in the instance of the
   ;;; element to be read.  This instruction produces a single output,
  
positive.code: ;;;
  ;;; Instruction SHORT-FLOAT-AREF-INSTRUCTION.
  ;;;
  ;;; This instruction takes a two inputs.  The first input is assumed
  ;;; to be an array specialized to SHORT-FLOAT.  The second is assumed
  ;;; to be a FIXNUM and represents the index in the instance of the
  ;;; element to be read.  This instruction produces a single output,
  
negative.code: ;;;
  ;;; Instruction AREF-INSTRUCTION.
  ;;;
  ;;; This instruction takes two inputs.  The first input is assumed
  ;;; to be a general array.  The second is assumed to be a FIXNUM
  ;;; and represents the index in the instance of the element to be read.
  ;;; This instruction produces a single output, the element read.
  