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• Expression-optimization

Vl-assign-optimize

Optimize expressions throughout a vl-assign-p.

Signature

(vl-assign-optimize x ss) → (mv changedp new-x)

Arguments

x — Guard (vl-assign-p x).

ss — Guard (vl-scopestack-p ss).

Returns

changedp — Type (booleanp changedp).

new-x — Type (vl-assign-p new-x).

Definitions and Theorems

Function: vl-assign-optimize

(defun vl-assign-optimize (x ss)
  (declare (xargs :guard (and (vl-assign-p x)
                              (vl-scopestack-p ss))))
  (let ((__function__ 'vl-assign-optimize))
    (declare (ignorable __function__))
    (b* ((x (vl-assign-fix x)))
      (b* (((mv lvalue-changedp lvalue-prime)
            (vl-expr-optimize (vl-assign->lvalue x)
                              ss))
           ((mv expr-changedp expr-prime)
            (vl-expr-optimize (vl-assign->expr x)
                              ss))
           ((when (or lvalue-changedp expr-changedp))
            (mv t
                (change-vl-assign x
                                  :lvalue lvalue-prime
                                  :expr expr-prime))))
        (mv nil x)))))

Theorem: booleanp-of-vl-assign-optimize.changedp

(defthm booleanp-of-vl-assign-optimize.changedp
  (b* (((mv ?changedp ?new-x)
        (vl-assign-optimize x ss)))
    (booleanp changedp))
  :rule-classes :type-prescription)

Theorem: vl-assign-p-of-vl-assign-optimize.new-x

(defthm vl-assign-p-of-vl-assign-optimize.new-x
  (b* (((mv ?changedp ?new-x)
        (vl-assign-optimize x ss)))
    (vl-assign-p new-x))
  :rule-classes :rewrite)

Theorem: vl-assign-optimize-of-vl-assign-fix-x

(defthm vl-assign-optimize-of-vl-assign-fix-x
  (equal (vl-assign-optimize (vl-assign-fix x)
                             ss)
         (vl-assign-optimize x ss)))

Theorem: vl-assign-optimize-vl-assign-equiv-congruence-on-x

(defthm vl-assign-optimize-vl-assign-equiv-congruence-on-x
  (implies (vl-assign-equiv x x-equiv)
           (equal (vl-assign-optimize x ss)
                  (vl-assign-optimize x-equiv ss)))
  :rule-classes :congruence)

Theorem: vl-assign-optimize-of-vl-scopestack-fix-ss

(defthm vl-assign-optimize-of-vl-scopestack-fix-ss
  (equal (vl-assign-optimize x (vl-scopestack-fix ss))
         (vl-assign-optimize x ss)))

Theorem: vl-assign-optimize-vl-scopestack-equiv-congruence-on-ss

(defthm vl-assign-optimize-vl-scopestack-equiv-congruence-on-ss
  (implies (vl-scopestack-equiv ss ss-equiv)
           (equal (vl-assign-optimize x ss)
                  (vl-assign-optimize x ss-equiv)))
  :rule-classes :congruence)