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Occform

Vl-gte-occform

Transform assign lhs = a > b into occurrences.

Signature
(vl-gte-occform x nf mod ialist warnings) → (mv new-warnings new-modules new-modinsts new-assigns new-nf)
Arguments: x — Guard (vl-assign-p x).; nf — Guard (vl-namefactory-p nf).; mod — Guard (vl-module-p mod).; ialist — Guard (equal ialist (vl-make-moditem-alist mod)).; warnings — Guard (vl-warninglist-p warnings).
Returns: new-warnings — Type (vl-warninglist-p new-warnings).; new-modules — Type (vl-modulelist-p new-modules).; new-modinsts — Type (vl-modinstlist-p new-modinsts).; new-assigns — Type (vl-assignlist-p new-assigns).; new-nf — Type (vl-namefactory-p new-nf).

Definitions and Theorems

Function: vl-gte-occform

(defun vl-gte-occform (x nf mod ialist warnings)
 (declare
    (xargs :guard (and (vl-assign-p x)
                       (vl-namefactory-p nf)
                       (vl-module-p mod)
                       (vl-warninglist-p warnings)
                       (equal ialist (vl-make-moditem-alist mod)))))
 (declare
     (xargs :guard (and (not (vl-atom-p (vl-assign->expr x)))
                        (member (vl-nonatom->op (vl-assign->expr x))
                                '(:vl-binary-gte))
                        t)))
 (let ((__function__ 'vl-gte-occform))
  (declare (ignorable __function__))
  (b* ((x (vl-assign-fix x))
       (warnings (vl-warninglist-fix warnings))
       (nf (vl-namefactory-fix nf)))
   (b*
    (((vl-assign x) x)
     (arg1 (first (vl-nonatom->args x.expr)))
     (arg2 (second (vl-nonatom->args x.expr)))
     (arg1width (vl-expr->finalwidth arg1))
     (arg1type (vl-expr->finaltype arg1))
     ((unless (and (equal (vl-expr->finalwidth x.expr) 1)
                   (equal (vl-expr->finaltype x.expr)
                          :vl-unsigned)
                   (equal (vl-expr->finalwidth x.lvalue) 1)
                   (vl-expr->finaltype x.lvalue)
                   arg1type (posp arg1width)
                   (equal arg1type (vl-expr->finaltype arg2))
                   (equal arg1width (vl-expr->finalwidth arg2))))
      (occform-return
       :assigns (list x)
       :warnings
       (fatal
         :type :vl-programming-error
         :msg "~a0: bad widths/types in assignment of >= operation."
         :args (list x))))
     (warnings
      (if (eq arg1type :vl-unsigned)
          warnings
       (warn
        :type :vl-warn-signed-comparison
        :msg
        "~a0: found a signed comparison expression.  This is ~
                       dangerous because whereas NCVerilog properly carries ~
                       out a comparison between 2's complement numbers, ~
                       Verilog-XL incorrectly uses an unsigned comparison.  ~
                       We follow the Verilog-2005 standard and mimick ~
                       NCVerilog, but to ensure compatibility across Verilog ~
                       implementations, you should probably not use signed ~
                       comparisons.  Some typical causes of signedness are ~
                       plain decimal numbers like 17, and the use of integer ~
                       variables instead of regs."
        :args (list x))))
     ((mv warnings arg1)
      (vl-occform-argfix arg1 mod ialist warnings))
     ((mv warnings arg2)
      (vl-occform-argfix arg2 mod ialist warnings))
     ((mv instname nf)
      (vl-namefactory-indexed-name "vl_gte" nf))
     (mods (if (eq arg1type :vl-unsigned)
               (vl-make-n-bit-unsigned-gte arg1width)
             (vl-make-n-bit-signed-gte arg1width)))
     (modinst
          (vl-simple-instantiate (car mods)
                                 instname (list x.lvalue arg1 arg2)
                                 :loc x.loc)))
    (occform-return :mods mods
                    :modinsts (list modinst))))))

Theorem: vl-warninglist-p-of-vl-gte-occform.new-warnings

(defthm vl-warninglist-p-of-vl-gte-occform.new-warnings
  (b* (((mv ?new-warnings ?new-modules
            ?new-modinsts ?new-assigns ?new-nf)
        (vl-gte-occform x nf mod ialist warnings)))
    (vl-warninglist-p new-warnings))
  :rule-classes :rewrite)

Theorem: vl-modulelist-p-of-vl-gte-occform.new-modules

(defthm vl-modulelist-p-of-vl-gte-occform.new-modules
  (b* (((mv ?new-warnings ?new-modules
            ?new-modinsts ?new-assigns ?new-nf)
        (vl-gte-occform x nf mod ialist warnings)))
    (vl-modulelist-p new-modules))
  :rule-classes :rewrite)

Theorem: vl-modinstlist-p-of-vl-gte-occform.new-modinsts

(defthm vl-modinstlist-p-of-vl-gte-occform.new-modinsts
  (b* (((mv ?new-warnings ?new-modules
            ?new-modinsts ?new-assigns ?new-nf)
        (vl-gte-occform x nf mod ialist warnings)))
    (vl-modinstlist-p new-modinsts))
  :rule-classes :rewrite)

Theorem: vl-assignlist-p-of-vl-gte-occform.new-assigns

(defthm vl-assignlist-p-of-vl-gte-occform.new-assigns
  (b* (((mv ?new-warnings ?new-modules
            ?new-modinsts ?new-assigns ?new-nf)
        (vl-gte-occform x nf mod ialist warnings)))
    (vl-assignlist-p new-assigns))
  :rule-classes :rewrite)

Theorem: vl-namefactory-p-of-vl-gte-occform.new-nf

(defthm vl-namefactory-p-of-vl-gte-occform.new-nf
  (b* (((mv ?new-warnings ?new-modules
            ?new-modinsts ?new-assigns ?new-nf)
        (vl-gte-occform x nf mod ialist warnings)))
    (vl-namefactory-p new-nf))
  :rule-classes :rewrite)

Theorem: vl-gte-occform-mvtypes-1

(defthm vl-gte-occform-mvtypes-1
  (true-listp (mv-nth 1
                      (vl-gte-occform x nf mod ialist warnings)))
  :rule-classes :type-prescription)

Theorem: vl-gte-occform-mvtypes-2

(defthm vl-gte-occform-mvtypes-2
  (true-listp (mv-nth 2
                      (vl-gte-occform x nf mod ialist warnings)))
  :rule-classes :type-prescription)

Theorem: vl-gte-occform-mvtypes-3

(defthm vl-gte-occform-mvtypes-3
  (true-listp (mv-nth 3
                      (vl-gte-occform x nf mod ialist warnings)))
  :rule-classes :type-prescription)

Theorem: vl-gte-occform-of-vl-assign-fix-x

(defthm vl-gte-occform-of-vl-assign-fix-x
  (equal (vl-gte-occform (vl-assign-fix x)
                         nf mod ialist warnings)
         (vl-gte-occform x nf mod ialist warnings)))

Theorem: vl-gte-occform-vl-assign-equiv-congruence-on-x

(defthm vl-gte-occform-vl-assign-equiv-congruence-on-x
  (implies (vl-assign-equiv x x-equiv)
           (equal (vl-gte-occform x nf mod ialist warnings)
                  (vl-gte-occform x-equiv nf mod ialist warnings)))
  :rule-classes :congruence)

Theorem: vl-gte-occform-of-vl-namefactory-fix-nf

(defthm vl-gte-occform-of-vl-namefactory-fix-nf
  (equal (vl-gte-occform x (vl-namefactory-fix nf)
                         mod ialist warnings)
         (vl-gte-occform x nf mod ialist warnings)))

Theorem: vl-gte-occform-vl-namefactory-equiv-congruence-on-nf

(defthm vl-gte-occform-vl-namefactory-equiv-congruence-on-nf
  (implies (vl-namefactory-equiv nf nf-equiv)
           (equal (vl-gte-occform x nf mod ialist warnings)
                  (vl-gte-occform x nf-equiv mod ialist warnings)))
  :rule-classes :congruence)

Theorem: vl-gte-occform-of-vl-module-fix-mod

(defthm vl-gte-occform-of-vl-module-fix-mod
  (equal (vl-gte-occform x nf (vl-module-fix mod)
                         ialist warnings)
         (vl-gte-occform x nf mod ialist warnings)))

Theorem: vl-gte-occform-vl-module-equiv-congruence-on-mod

(defthm vl-gte-occform-vl-module-equiv-congruence-on-mod
  (implies (vl-module-equiv mod mod-equiv)
           (equal (vl-gte-occform x nf mod ialist warnings)
                  (vl-gte-occform x nf mod-equiv ialist warnings)))
  :rule-classes :congruence)

Theorem: vl-gte-occform-of-vl-warninglist-fix-warnings

(defthm vl-gte-occform-of-vl-warninglist-fix-warnings
  (equal (vl-gte-occform x nf mod
                         ialist (vl-warninglist-fix warnings))
         (vl-gte-occform x nf mod ialist warnings)))

Theorem: vl-gte-occform-vl-warninglist-equiv-congruence-on-warnings

(defthm vl-gte-occform-vl-warninglist-equiv-congruence-on-warnings
  (implies (vl-warninglist-equiv warnings warnings-equiv)
           (equal (vl-gte-occform x nf mod ialist warnings)
                  (vl-gte-occform x nf mod ialist warnings-equiv)))
  :rule-classes :congruence)