anchor.diff:      ((= opcode #xf8) (clear-carry-flag))
       ((= opcode #xf9) (set-carry-flag))
       ((= opcode #xeb) (jmp-short))
  +    ((in-paired-byte-block-p opcode #x70) (jmp-short-conditionally opcode (flag-p :of) "o"))
       ((in-paired-byte-block-p opcode #x72) (jmp-short-conditionally opcode (flag-p :cf) "b"))
       ((in-paired-byte-block-p opcode #x74) (jmp-short-conditionally opcode (flag-p :zf) "z"))
       ((in-paired-byte-block-p opcode #x76) (jmp-short-conditionally opcode (or (flag-p :cf) (flag-p :zf)) "be"))
       ((in-paired-byte-block-p opcode #x78) (jmp-short-conditionally opcode (flag-p :sf) "s"))
  +    ((in-paired-byte-block-p opcode #x7c) (jmp-short-conditionally opcode (not (eq (flag-p :of) (flag-p :sf))) "l"))
  +    ((in-paired-byte-block-p opcode #x7e) (jmp-short-conditionally opcode (or (flag-p :zf) (not (eq (flag-p :of) (flag-p :sf)))) "le"))
       ((= opcode #xe8) (call-near))
       ((= opcode #xc3) (ret-from-call))
       ((in-6-byte-block-p opcode #x00) (parse-alu-opcode opcode add-without-carry))
  
positive.code: (defmacro add-without-carry (src dest is-word &optional mod-bits r/m-bits)
    `(disasm-instr (list "add" :src ,src :dest ,dest)
       (with-in-place-mod ,dest ,mod-bits ,r/m-bits
         (set-zf-on-op (set-sf-on-op (set-cf-on-add (incf ,dest ,src)) ,is-word)))))
  
  (defmacro add-with-carry (src dest is-word &optional mod-bits r/m-bits)
    `(disasm-instr (list "adc" :src ,src :dest ,dest)
       (with-in-place-mod ,dest ,mod-bits ,r/m-bits
         (set-zf-on-op (set-sf-on-op (set-cf-on-add (incf ,dest (+ ,src (flag :cf)))) ,is-word)))))
  
  (defmacro sub-without-borrow (src dest is-word &optional mod-bits r/m-bits)
    `(disasm-instr (list "sub" :src ,src :dest ,dest)
       (with-in-place-mod ,dest ,mod-bits ,r/m-bits
         (let ((src-value ,src))
  	 (set-zf-on-op (set-sf-on-op (set-cf-on-sub (+ (decf ,dest src-value) src-value) src-value) ,is-word))))))
  
  (defmacro sub-with-borrow (src dest is-word &optional mod-bits r/m-bits)
    `(disasm-instr (list "sbb" :src ,src :dest ,dest)
       (with-in-place-mod ,dest ,mod-bits ,r/m-bits
         (let ((src-plus-cf (+ ,src (flag :cf))))
  	 (set-zf-on-op (set-sf-on-op (set-cf-on-sub (+ (decf ,dest src-plus-cf) src-plus-cf) src-plus-cf) ,is-word))))))
  
  (defmacro cmp-operation (src dest is-word &optional mod-bits r/m-bits)
    `(disasm-instr (list "cmp" :src ,src :dest ,dest)
       (set-zf-on-op (set-sf-on-op (set-cf-on-sub ,dest ,src) ,is-word))))
  
  (defmacro and-operation (src dest is-word &optional mod-bits r/m-bits)
    `(disasm-instr (list "and" :src ,src :dest ,dest)
       (with-in-place-mod ,dest ,mod-bits ,r/m-bits
         (set-zf-on-op (set-sf-on-op (setf ,dest (logand ,src ,dest)) ,is-word))
         (setf (flag-p :cf) nil))))
  
  (defmacro or-operation (src dest is-word &optional mod-bits r/m-bits)
    `(disasm-instr (list "or" :src ,src :dest ,dest)
       (with-in-place-mod ,dest ,mod-bits ,r/m-bits
         (set-zf-on-op (set-sf-on-op (setf ,dest (logior ,src ,dest)) ,is-word))
         (setf (flag-p :cf) nil))))
  
  (defmacro xor-operation (src dest is-word &optional mod-bits r/m-bits)
    `(disasm-instr (list "xor" :src ,src :dest ,dest)
       (with-in-place-mod ,dest ,mod-bits ,r/m-bits
         (set-zf-on-op (set-sf-on-op (setf ,dest (logxor ,src ,dest)) ,is-word))
         (setf (flag-p :cf) nil))))
  
  (defmacro parse-group1-byte (opcode operation mod-bits r/m-bits)
    `(case (mod ,opcode 4)
  
negative.code:   (+ low (ash high 8)))
  
  (defun negative-p (value is-word)
    (let ((sign-and (if is-word #x8000 #x80)))
      (= (logand sign-and value) sign-and)))
  
  (defun twos-complement (value is-word)
    (if (negative-p value is-word)
  