		Search-engine friendly clone of the ACL2 documentation.

Structures

Vex3-byte2

An 8-bit unsigned bitstruct type.

This is a bitstruct type introduced by defbitstruct, represented as a unsigned 8-bit integer.

Fields

pp — 2bits: Opcode extension providing equivalent functionality of a SIMD prefix
#b00: None
#b01: #x66
#b10: #xF3
#b11: #xF2
l — bit: Vector Length
0: scalar or 128-bit vector
1: 256-bit vector
vvvv — 4bits: A register specifier (in 1's complement form) or 1111 if unused.
w — bit: Opcode specific (use like REX.W, or used for opcode extension, or ignored, depending on the opcode byte.

Definitions and Theorems

Function: vex3-byte2-p$inline

(defun vex3-byte2-p$inline (x)
  (declare (xargs :guard t))
  (mbe :logic (unsigned-byte-p 8 x)
       :exec (and (natp x) (< x 256))))

Theorem: vex3-byte2-p-when-unsigned-byte-p

(defthm vex3-byte2-p-when-unsigned-byte-p
  (implies (unsigned-byte-p 8 x)
           (vex3-byte2-p x)))

Theorem: unsigned-byte-p-when-vex3-byte2-p

(defthm unsigned-byte-p-when-vex3-byte2-p
  (implies (vex3-byte2-p x)
           (unsigned-byte-p 8 x)))

Theorem: vex3-byte2-p-compound-recognizer

(defthm vex3-byte2-p-compound-recognizer
  (implies (vex3-byte2-p x) (natp x))
  :rule-classes :compound-recognizer)

Function: vex3-byte2-fix$inline

(defun vex3-byte2-fix$inline (x)
  (declare (xargs :guard (vex3-byte2-p x)))
  (mbe :logic (loghead 8 x) :exec x))

Theorem: vex3-byte2-p-of-vex3-byte2-fix

(defthm vex3-byte2-p-of-vex3-byte2-fix
  (b* ((fty::fixed (vex3-byte2-fix$inline x)))
    (vex3-byte2-p fty::fixed))
  :rule-classes :rewrite)

Theorem: vex3-byte2-fix-when-vex3-byte2-p

(defthm vex3-byte2-fix-when-vex3-byte2-p
  (implies (vex3-byte2-p x)
           (equal (vex3-byte2-fix x) x)))

Function: vex3-byte2-equiv$inline

(defun vex3-byte2-equiv$inline (x y)
  (declare (xargs :guard (and (vex3-byte2-p x)
                              (vex3-byte2-p y))))
  (equal (vex3-byte2-fix x)
         (vex3-byte2-fix y)))

Theorem: vex3-byte2-equiv-is-an-equivalence

(defthm vex3-byte2-equiv-is-an-equivalence
  (and (booleanp (vex3-byte2-equiv x y))
       (vex3-byte2-equiv x x)
       (implies (vex3-byte2-equiv x y)
                (vex3-byte2-equiv y x))
       (implies (and (vex3-byte2-equiv x y)
                     (vex3-byte2-equiv y z))
                (vex3-byte2-equiv x z)))
  :rule-classes (:equivalence))

Theorem: vex3-byte2-equiv-implies-equal-vex3-byte2-fix-1

(defthm vex3-byte2-equiv-implies-equal-vex3-byte2-fix-1
  (implies (vex3-byte2-equiv x x-equiv)
           (equal (vex3-byte2-fix x)
                  (vex3-byte2-fix x-equiv)))
  :rule-classes (:congruence))

Theorem: vex3-byte2-fix-under-vex3-byte2-equiv

(defthm vex3-byte2-fix-under-vex3-byte2-equiv
  (vex3-byte2-equiv (vex3-byte2-fix x) x)
  :rule-classes (:rewrite :rewrite-quoted-constant))

Function: vex3-byte2$inline

(defun vex3-byte2$inline (pp l vvvv w)
  (declare (xargs :guard (and (2bits-p pp)
                              (bitp l)
                              (4bits-p vvvv)
                              (bitp w))))
  (b* ((pp (mbe :logic (2bits-fix pp) :exec pp))
       (l (mbe :logic (bfix l) :exec l))
       (vvvv (mbe :logic (4bits-fix vvvv)
                  :exec vvvv))
       (w (mbe :logic (bfix w) :exec w)))
    (logapp 2 pp (logapp 1 l (logapp 4 vvvv w)))))

Theorem: vex3-byte2-p-of-vex3-byte2

(defthm vex3-byte2-p-of-vex3-byte2
  (b* ((vex3-byte2 (vex3-byte2$inline pp l vvvv w)))
    (vex3-byte2-p vex3-byte2))
  :rule-classes :rewrite)

Theorem: vex3-byte2$inline-of-2bits-fix-pp

(defthm vex3-byte2$inline-of-2bits-fix-pp
  (equal (vex3-byte2$inline (2bits-fix pp)
                            l vvvv w)
         (vex3-byte2$inline pp l vvvv w)))

Theorem: vex3-byte2$inline-2bits-equiv-congruence-on-pp

(defthm vex3-byte2$inline-2bits-equiv-congruence-on-pp
  (implies (2bits-equiv pp pp-equiv)
           (equal (vex3-byte2$inline pp l vvvv w)
                  (vex3-byte2$inline pp-equiv l vvvv w)))
  :rule-classes :congruence)

Theorem: vex3-byte2$inline-of-bfix-l

(defthm vex3-byte2$inline-of-bfix-l
  (equal (vex3-byte2$inline pp (bfix l) vvvv w)
         (vex3-byte2$inline pp l vvvv w)))

Theorem: vex3-byte2$inline-bit-equiv-congruence-on-l

(defthm vex3-byte2$inline-bit-equiv-congruence-on-l
  (implies (bit-equiv l l-equiv)
           (equal (vex3-byte2$inline pp l vvvv w)
                  (vex3-byte2$inline pp l-equiv vvvv w)))
  :rule-classes :congruence)

Theorem: vex3-byte2$inline-of-4bits-fix-vvvv

(defthm vex3-byte2$inline-of-4bits-fix-vvvv
  (equal (vex3-byte2$inline pp l (4bits-fix vvvv)
                            w)
         (vex3-byte2$inline pp l vvvv w)))

Theorem: vex3-byte2$inline-4bits-equiv-congruence-on-vvvv

(defthm vex3-byte2$inline-4bits-equiv-congruence-on-vvvv
  (implies (4bits-equiv vvvv vvvv-equiv)
           (equal (vex3-byte2$inline pp l vvvv w)
                  (vex3-byte2$inline pp l vvvv-equiv w)))
  :rule-classes :congruence)

Theorem: vex3-byte2$inline-of-bfix-w

(defthm vex3-byte2$inline-of-bfix-w
  (equal (vex3-byte2$inline pp l vvvv (bfix w))
         (vex3-byte2$inline pp l vvvv w)))

Theorem: vex3-byte2$inline-bit-equiv-congruence-on-w

(defthm vex3-byte2$inline-bit-equiv-congruence-on-w
  (implies (bit-equiv w w-equiv)
           (equal (vex3-byte2$inline pp l vvvv w)
                  (vex3-byte2$inline pp l vvvv w-equiv)))
  :rule-classes :congruence)

Function: vex3-byte2-equiv-under-mask$inline

(defun vex3-byte2-equiv-under-mask$inline (x x1 mask)
  (declare (xargs :guard (and (vex3-byte2-p x)
                              (vex3-byte2-p x1)
                              (integerp mask))))
  (fty::int-equiv-under-mask (vex3-byte2-fix x)
                             (vex3-byte2-fix x1)
                             mask))

Function: vex3-byte2->pp$inline

(defun vex3-byte2->pp$inline (x)
  (declare (xargs :guard (vex3-byte2-p x)))
  (mbe :logic
       (let ((x (vex3-byte2-fix x)))
         (part-select x :low 0 :width 2))
       :exec (the (unsigned-byte 2)
                  (logand (the (unsigned-byte 2) 3)
                          (the (unsigned-byte 8) x)))))

Theorem: 2bits-p-of-vex3-byte2->pp

(defthm 2bits-p-of-vex3-byte2->pp
  (b* ((pp (vex3-byte2->pp$inline x)))
    (2bits-p pp))
  :rule-classes :rewrite)

Theorem: vex3-byte2->pp$inline-of-vex3-byte2-fix-x

(defthm vex3-byte2->pp$inline-of-vex3-byte2-fix-x
  (equal (vex3-byte2->pp$inline (vex3-byte2-fix x))
         (vex3-byte2->pp$inline x)))

Theorem: vex3-byte2->pp$inline-vex3-byte2-equiv-congruence-on-x

(defthm vex3-byte2->pp$inline-vex3-byte2-equiv-congruence-on-x
  (implies (vex3-byte2-equiv x x-equiv)
           (equal (vex3-byte2->pp$inline x)
                  (vex3-byte2->pp$inline x-equiv)))
  :rule-classes :congruence)

Theorem: vex3-byte2->pp-of-vex3-byte2

(defthm vex3-byte2->pp-of-vex3-byte2
  (equal (vex3-byte2->pp (vex3-byte2 pp l vvvv w))
         (2bits-fix pp)))

Theorem: vex3-byte2->pp-of-write-with-mask

(defthm vex3-byte2->pp-of-write-with-mask
  (implies (and (fty::bitstruct-read-over-write-hyps
                     x vex3-byte2-equiv-under-mask)
                (vex3-byte2-equiv-under-mask x y fty::mask)
                (equal (logand (lognot fty::mask) 3) 0))
           (equal (vex3-byte2->pp x)
                  (vex3-byte2->pp y))))

Function: vex3-byte2->l$inline

(defun vex3-byte2->l$inline (x)
 (declare (xargs :guard (vex3-byte2-p x)))
 (mbe
     :logic
     (let ((x (vex3-byte2-fix x)))
       (part-select x :low 2 :width 1))
     :exec (the (unsigned-byte 1)
                (logand (the (unsigned-byte 1) 1)
                        (the (unsigned-byte 6)
                             (ash (the (unsigned-byte 8) x) -2))))))

Theorem: bitp-of-vex3-byte2->l

(defthm bitp-of-vex3-byte2->l
  (b* ((l (vex3-byte2->l$inline x)))
    (bitp l))
  :rule-classes :rewrite)

Theorem: vex3-byte2->l$inline-of-vex3-byte2-fix-x

(defthm vex3-byte2->l$inline-of-vex3-byte2-fix-x
  (equal (vex3-byte2->l$inline (vex3-byte2-fix x))
         (vex3-byte2->l$inline x)))

Theorem: vex3-byte2->l$inline-vex3-byte2-equiv-congruence-on-x

(defthm vex3-byte2->l$inline-vex3-byte2-equiv-congruence-on-x
  (implies (vex3-byte2-equiv x x-equiv)
           (equal (vex3-byte2->l$inline x)
                  (vex3-byte2->l$inline x-equiv)))
  :rule-classes :congruence)

Theorem: vex3-byte2->l-of-vex3-byte2

(defthm vex3-byte2->l-of-vex3-byte2
  (equal (vex3-byte2->l (vex3-byte2 pp l vvvv w))
         (bfix l)))

Theorem: vex3-byte2->l-of-write-with-mask

(defthm vex3-byte2->l-of-write-with-mask
  (implies (and (fty::bitstruct-read-over-write-hyps
                     x vex3-byte2-equiv-under-mask)
                (vex3-byte2-equiv-under-mask x y fty::mask)
                (equal (logand (lognot fty::mask) 4) 0))
           (equal (vex3-byte2->l x)
                  (vex3-byte2->l y))))

Function: vex3-byte2->vvvv$inline

(defun vex3-byte2->vvvv$inline (x)
 (declare (xargs :guard (vex3-byte2-p x)))
 (mbe
     :logic
     (let ((x (vex3-byte2-fix x)))
       (part-select x :low 3 :width 4))
     :exec (the (unsigned-byte 4)
                (logand (the (unsigned-byte 4) 15)
                        (the (unsigned-byte 5)
                             (ash (the (unsigned-byte 8) x) -3))))))

Theorem: 4bits-p-of-vex3-byte2->vvvv

(defthm 4bits-p-of-vex3-byte2->vvvv
  (b* ((vvvv (vex3-byte2->vvvv$inline x)))
    (4bits-p vvvv))
  :rule-classes :rewrite)

Theorem: vex3-byte2->vvvv$inline-of-vex3-byte2-fix-x

(defthm vex3-byte2->vvvv$inline-of-vex3-byte2-fix-x
  (equal (vex3-byte2->vvvv$inline (vex3-byte2-fix x))
         (vex3-byte2->vvvv$inline x)))

Theorem: vex3-byte2->vvvv$inline-vex3-byte2-equiv-congruence-on-x

(defthm vex3-byte2->vvvv$inline-vex3-byte2-equiv-congruence-on-x
  (implies (vex3-byte2-equiv x x-equiv)
           (equal (vex3-byte2->vvvv$inline x)
                  (vex3-byte2->vvvv$inline x-equiv)))
  :rule-classes :congruence)

Theorem: vex3-byte2->vvvv-of-vex3-byte2

(defthm vex3-byte2->vvvv-of-vex3-byte2
  (equal (vex3-byte2->vvvv (vex3-byte2 pp l vvvv w))
         (4bits-fix vvvv)))

Theorem: vex3-byte2->vvvv-of-write-with-mask

(defthm vex3-byte2->vvvv-of-write-with-mask
  (implies (and (fty::bitstruct-read-over-write-hyps
                     x vex3-byte2-equiv-under-mask)
                (vex3-byte2-equiv-under-mask x y fty::mask)
                (equal (logand (lognot fty::mask) 120)
                       0))
           (equal (vex3-byte2->vvvv x)
                  (vex3-byte2->vvvv y))))

Function: vex3-byte2->w$inline

(defun vex3-byte2->w$inline (x)
 (declare (xargs :guard (vex3-byte2-p x)))
 (mbe
     :logic
     (let ((x (vex3-byte2-fix x)))
       (part-select x :low 7 :width 1))
     :exec (the (unsigned-byte 1)
                (logand (the (unsigned-byte 1) 1)
                        (the (unsigned-byte 1)
                             (ash (the (unsigned-byte 8) x) -7))))))

Theorem: bitp-of-vex3-byte2->w

(defthm bitp-of-vex3-byte2->w
  (b* ((w (vex3-byte2->w$inline x)))
    (bitp w))
  :rule-classes :rewrite)

Theorem: vex3-byte2->w$inline-of-vex3-byte2-fix-x

(defthm vex3-byte2->w$inline-of-vex3-byte2-fix-x
  (equal (vex3-byte2->w$inline (vex3-byte2-fix x))
         (vex3-byte2->w$inline x)))

Theorem: vex3-byte2->w$inline-vex3-byte2-equiv-congruence-on-x

(defthm vex3-byte2->w$inline-vex3-byte2-equiv-congruence-on-x
  (implies (vex3-byte2-equiv x x-equiv)
           (equal (vex3-byte2->w$inline x)
                  (vex3-byte2->w$inline x-equiv)))
  :rule-classes :congruence)

Theorem: vex3-byte2->w-of-vex3-byte2

(defthm vex3-byte2->w-of-vex3-byte2
  (equal (vex3-byte2->w (vex3-byte2 pp l vvvv w))
         (bfix w)))

Theorem: vex3-byte2->w-of-write-with-mask

(defthm vex3-byte2->w-of-write-with-mask
  (implies (and (fty::bitstruct-read-over-write-hyps
                     x vex3-byte2-equiv-under-mask)
                (vex3-byte2-equiv-under-mask x y fty::mask)
                (equal (logand (lognot fty::mask) 128)
                       0))
           (equal (vex3-byte2->w x)
                  (vex3-byte2->w y))))

Theorem: vex3-byte2-fix-in-terms-of-vex3-byte2

(defthm vex3-byte2-fix-in-terms-of-vex3-byte2
  (equal (vex3-byte2-fix x)
         (change-vex3-byte2 x)))

Function: !vex3-byte2->pp$inline

(defun !vex3-byte2->pp$inline (pp x)
  (declare (xargs :guard (and (2bits-p pp) (vex3-byte2-p x))))
  (mbe :logic
       (b* ((pp (mbe :logic (2bits-fix pp) :exec pp))
            (x (vex3-byte2-fix x)))
         (part-install pp x :width 2 :low 0))
       :exec (the (unsigned-byte 8)
                  (logior (the (unsigned-byte 8)
                               (logand (the (unsigned-byte 8) x)
                                       (the (signed-byte 3) -4)))
                          (the (unsigned-byte 2) pp)))))

Theorem: vex3-byte2-p-of-!vex3-byte2->pp

(defthm vex3-byte2-p-of-!vex3-byte2->pp
  (b* ((new-x (!vex3-byte2->pp$inline pp x)))
    (vex3-byte2-p new-x))
  :rule-classes :rewrite)

Theorem: !vex3-byte2->pp$inline-of-2bits-fix-pp

(defthm !vex3-byte2->pp$inline-of-2bits-fix-pp
  (equal (!vex3-byte2->pp$inline (2bits-fix pp)
                                 x)
         (!vex3-byte2->pp$inline pp x)))

Theorem: !vex3-byte2->pp$inline-2bits-equiv-congruence-on-pp

(defthm !vex3-byte2->pp$inline-2bits-equiv-congruence-on-pp
  (implies (2bits-equiv pp pp-equiv)
           (equal (!vex3-byte2->pp$inline pp x)
                  (!vex3-byte2->pp$inline pp-equiv x)))
  :rule-classes :congruence)

Theorem: !vex3-byte2->pp$inline-of-vex3-byte2-fix-x

(defthm !vex3-byte2->pp$inline-of-vex3-byte2-fix-x
  (equal (!vex3-byte2->pp$inline pp (vex3-byte2-fix x))
         (!vex3-byte2->pp$inline pp x)))

Theorem: !vex3-byte2->pp$inline-vex3-byte2-equiv-congruence-on-x

(defthm !vex3-byte2->pp$inline-vex3-byte2-equiv-congruence-on-x
  (implies (vex3-byte2-equiv x x-equiv)
           (equal (!vex3-byte2->pp$inline pp x)
                  (!vex3-byte2->pp$inline pp x-equiv)))
  :rule-classes :congruence)

Theorem: !vex3-byte2->pp-is-vex3-byte2

(defthm !vex3-byte2->pp-is-vex3-byte2
  (equal (!vex3-byte2->pp pp x)
         (change-vex3-byte2 x :pp pp)))

Theorem: vex3-byte2->pp-of-!vex3-byte2->pp

(defthm vex3-byte2->pp-of-!vex3-byte2->pp
  (b* ((?new-x (!vex3-byte2->pp$inline pp x)))
    (equal (vex3-byte2->pp new-x)
           (2bits-fix pp))))

Theorem: !vex3-byte2->pp-equiv-under-mask

(defthm !vex3-byte2->pp-equiv-under-mask
  (b* ((?new-x (!vex3-byte2->pp$inline pp x)))
    (vex3-byte2-equiv-under-mask new-x x -4)))

Function: !vex3-byte2->l$inline

(defun !vex3-byte2->l$inline (l x)
 (declare (xargs :guard (and (bitp l) (vex3-byte2-p x))))
 (mbe :logic
      (b* ((l (mbe :logic (bfix l) :exec l))
           (x (vex3-byte2-fix x)))
        (part-install l x :width 1 :low 2))
      :exec (the (unsigned-byte 8)
                 (logior (the (unsigned-byte 8)
                              (logand (the (unsigned-byte 8) x)
                                      (the (signed-byte 4) -5)))
                         (the (unsigned-byte 3)
                              (ash (the (unsigned-byte 1) l) 2))))))

Theorem: vex3-byte2-p-of-!vex3-byte2->l

(defthm vex3-byte2-p-of-!vex3-byte2->l
  (b* ((new-x (!vex3-byte2->l$inline l x)))
    (vex3-byte2-p new-x))
  :rule-classes :rewrite)

Theorem: !vex3-byte2->l$inline-of-bfix-l

(defthm !vex3-byte2->l$inline-of-bfix-l
  (equal (!vex3-byte2->l$inline (bfix l) x)
         (!vex3-byte2->l$inline l x)))

Theorem: !vex3-byte2->l$inline-bit-equiv-congruence-on-l

(defthm !vex3-byte2->l$inline-bit-equiv-congruence-on-l
  (implies (bit-equiv l l-equiv)
           (equal (!vex3-byte2->l$inline l x)
                  (!vex3-byte2->l$inline l-equiv x)))
  :rule-classes :congruence)

Theorem: !vex3-byte2->l$inline-of-vex3-byte2-fix-x

(defthm !vex3-byte2->l$inline-of-vex3-byte2-fix-x
  (equal (!vex3-byte2->l$inline l (vex3-byte2-fix x))
         (!vex3-byte2->l$inline l x)))

Theorem: !vex3-byte2->l$inline-vex3-byte2-equiv-congruence-on-x

(defthm !vex3-byte2->l$inline-vex3-byte2-equiv-congruence-on-x
  (implies (vex3-byte2-equiv x x-equiv)
           (equal (!vex3-byte2->l$inline l x)
                  (!vex3-byte2->l$inline l x-equiv)))
  :rule-classes :congruence)

Theorem: !vex3-byte2->l-is-vex3-byte2

(defthm !vex3-byte2->l-is-vex3-byte2
  (equal (!vex3-byte2->l l x)
         (change-vex3-byte2 x :l l)))

Theorem: vex3-byte2->l-of-!vex3-byte2->l

(defthm vex3-byte2->l-of-!vex3-byte2->l
  (b* ((?new-x (!vex3-byte2->l$inline l x)))
    (equal (vex3-byte2->l new-x) (bfix l))))

Theorem: !vex3-byte2->l-equiv-under-mask

(defthm !vex3-byte2->l-equiv-under-mask
  (b* ((?new-x (!vex3-byte2->l$inline l x)))
    (vex3-byte2-equiv-under-mask new-x x -5)))

Function: !vex3-byte2->vvvv$inline

(defun !vex3-byte2->vvvv$inline (vvvv x)
  (declare (xargs :guard (and (4bits-p vvvv) (vex3-byte2-p x))))
  (mbe :logic
       (b* ((vvvv (mbe :logic (4bits-fix vvvv)
                       :exec vvvv))
            (x (vex3-byte2-fix x)))
         (part-install vvvv x :width 4 :low 3))
       :exec (the (unsigned-byte 8)
                  (logior (the (unsigned-byte 8)
                               (logand (the (unsigned-byte 8) x)
                                       (the (signed-byte 8) -121)))
                          (the (unsigned-byte 7)
                               (ash (the (unsigned-byte 4) vvvv)
                                    3))))))

Theorem: vex3-byte2-p-of-!vex3-byte2->vvvv

(defthm vex3-byte2-p-of-!vex3-byte2->vvvv
  (b* ((new-x (!vex3-byte2->vvvv$inline vvvv x)))
    (vex3-byte2-p new-x))
  :rule-classes :rewrite)

Theorem: !vex3-byte2->vvvv$inline-of-4bits-fix-vvvv

(defthm !vex3-byte2->vvvv$inline-of-4bits-fix-vvvv
  (equal (!vex3-byte2->vvvv$inline (4bits-fix vvvv)
                                   x)
         (!vex3-byte2->vvvv$inline vvvv x)))

Theorem: !vex3-byte2->vvvv$inline-4bits-equiv-congruence-on-vvvv

(defthm !vex3-byte2->vvvv$inline-4bits-equiv-congruence-on-vvvv
  (implies (4bits-equiv vvvv vvvv-equiv)
           (equal (!vex3-byte2->vvvv$inline vvvv x)
                  (!vex3-byte2->vvvv$inline vvvv-equiv x)))
  :rule-classes :congruence)

Theorem: !vex3-byte2->vvvv$inline-of-vex3-byte2-fix-x

(defthm !vex3-byte2->vvvv$inline-of-vex3-byte2-fix-x
  (equal (!vex3-byte2->vvvv$inline vvvv (vex3-byte2-fix x))
         (!vex3-byte2->vvvv$inline vvvv x)))

Theorem: !vex3-byte2->vvvv$inline-vex3-byte2-equiv-congruence-on-x

(defthm !vex3-byte2->vvvv$inline-vex3-byte2-equiv-congruence-on-x
  (implies (vex3-byte2-equiv x x-equiv)
           (equal (!vex3-byte2->vvvv$inline vvvv x)
                  (!vex3-byte2->vvvv$inline vvvv x-equiv)))
  :rule-classes :congruence)

Theorem: !vex3-byte2->vvvv-is-vex3-byte2

(defthm !vex3-byte2->vvvv-is-vex3-byte2
  (equal (!vex3-byte2->vvvv vvvv x)
         (change-vex3-byte2 x :vvvv vvvv)))

Theorem: vex3-byte2->vvvv-of-!vex3-byte2->vvvv

(defthm vex3-byte2->vvvv-of-!vex3-byte2->vvvv
  (b* ((?new-x (!vex3-byte2->vvvv$inline vvvv x)))
    (equal (vex3-byte2->vvvv new-x)
           (4bits-fix vvvv))))

Theorem: !vex3-byte2->vvvv-equiv-under-mask

(defthm !vex3-byte2->vvvv-equiv-under-mask
  (b* ((?new-x (!vex3-byte2->vvvv$inline vvvv x)))
    (vex3-byte2-equiv-under-mask new-x x -121)))

Function: !vex3-byte2->w$inline

(defun !vex3-byte2->w$inline (w x)
 (declare (xargs :guard (and (bitp w) (vex3-byte2-p x))))
 (mbe :logic
      (b* ((w (mbe :logic (bfix w) :exec w))
           (x (vex3-byte2-fix x)))
        (part-install w x :width 1 :low 7))
      :exec (the (unsigned-byte 8)
                 (logior (the (unsigned-byte 8)
                              (logand (the (unsigned-byte 8) x)
                                      (the (signed-byte 9) -129)))
                         (the (unsigned-byte 8)
                              (ash (the (unsigned-byte 1) w) 7))))))

Theorem: vex3-byte2-p-of-!vex3-byte2->w

(defthm vex3-byte2-p-of-!vex3-byte2->w
  (b* ((new-x (!vex3-byte2->w$inline w x)))
    (vex3-byte2-p new-x))
  :rule-classes :rewrite)

Theorem: !vex3-byte2->w$inline-of-bfix-w

(defthm !vex3-byte2->w$inline-of-bfix-w
  (equal (!vex3-byte2->w$inline (bfix w) x)
         (!vex3-byte2->w$inline w x)))

Theorem: !vex3-byte2->w$inline-bit-equiv-congruence-on-w

(defthm !vex3-byte2->w$inline-bit-equiv-congruence-on-w
  (implies (bit-equiv w w-equiv)
           (equal (!vex3-byte2->w$inline w x)
                  (!vex3-byte2->w$inline w-equiv x)))
  :rule-classes :congruence)

Theorem: !vex3-byte2->w$inline-of-vex3-byte2-fix-x

(defthm !vex3-byte2->w$inline-of-vex3-byte2-fix-x
  (equal (!vex3-byte2->w$inline w (vex3-byte2-fix x))
         (!vex3-byte2->w$inline w x)))

Theorem: !vex3-byte2->w$inline-vex3-byte2-equiv-congruence-on-x

(defthm !vex3-byte2->w$inline-vex3-byte2-equiv-congruence-on-x
  (implies (vex3-byte2-equiv x x-equiv)
           (equal (!vex3-byte2->w$inline w x)
                  (!vex3-byte2->w$inline w x-equiv)))
  :rule-classes :congruence)

Theorem: !vex3-byte2->w-is-vex3-byte2

(defthm !vex3-byte2->w-is-vex3-byte2
  (equal (!vex3-byte2->w w x)
         (change-vex3-byte2 x :w w)))

Theorem: vex3-byte2->w-of-!vex3-byte2->w

(defthm vex3-byte2->w-of-!vex3-byte2->w
  (b* ((?new-x (!vex3-byte2->w$inline w x)))
    (equal (vex3-byte2->w new-x) (bfix w))))

Theorem: !vex3-byte2->w-equiv-under-mask

(defthm !vex3-byte2->w-equiv-under-mask
  (b* ((?new-x (!vex3-byte2->w$inline w x)))
    (vex3-byte2-equiv-under-mask new-x x 127)))

Function: vex3-byte2-debug$inline

(defun vex3-byte2-debug$inline (x)
  (declare (xargs :guard (vex3-byte2-p x)))
  (b* (((vex3-byte2 x)))
    (cons (cons 'pp x.pp)
          (cons (cons 'l x.l)
                (cons (cons 'vvvv x.vvvv)
                      (cons (cons 'w x.w) nil))))))

Subtopics

!vex3-byte2->vvvv: Update the |X86ISA|::|VVVV| field of a vex3-byte2 bit structure.
!vex3-byte2->w: Update the |ACL2|::|W| field of a vex3-byte2 bit structure.
!vex3-byte2->pp: Update the |X86ISA|::|PP| field of a vex3-byte2 bit structure.
!vex3-byte2->l: Update the |ACL2|::|L| field of a vex3-byte2 bit structure.
Vex3-byte2-p: Recognizer for vex3-byte2 bit structures.
Vex3-byte2->vvvv: Access the |X86ISA|::|VVVV| field of a vex3-byte2 bit structure.
Vex3-byte2-fix: Fixing function for vex3-byte2 bit structures.
Vex3-byte2->w: Access the |ACL2|::|W| field of a vex3-byte2 bit structure.
Vex3-byte2->pp: Access the |X86ISA|::|PP| field of a vex3-byte2 bit structure.
Vex3-byte2->l: Access the |ACL2|::|L| field of a vex3-byte2 bit structure.