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Representation-of-integer-operations

Shl-ushort-ulong-okp

Check if the left shift of a value of type unsigned short by a value of type unsigned long is well-defined.

Definitions and Theorems

Function: shl-ushort-ulong-okp

(defun shl-ushort-ulong-okp (x y)
  (declare (xargs :guard (and (ushortp x) (ulongp y))))
  (shl-ushort-okp x (integer-from-ulong y)))

Theorem: booleanp-of-shl-ushort-ulong-okp

(defthm booleanp-of-shl-ushort-ulong-okp
  (booleanp (shl-ushort-ulong-okp x y)))

Theorem: shl-ushort-ulong-okp-of-ushort-fix-x

(defthm shl-ushort-ulong-okp-of-ushort-fix-x
  (equal (shl-ushort-ulong-okp (ushort-fix x) y)
         (shl-ushort-ulong-okp x y)))

Theorem: shl-ushort-ulong-okp-ushort-equiv-congruence-on-x

(defthm shl-ushort-ulong-okp-ushort-equiv-congruence-on-x
  (implies (ushort-equiv x x-equiv)
           (equal (shl-ushort-ulong-okp x y)
                  (shl-ushort-ulong-okp x-equiv y)))
  :rule-classes :congruence)

Theorem: shl-ushort-ulong-okp-of-ulong-fix-y

(defthm shl-ushort-ulong-okp-of-ulong-fix-y
  (equal (shl-ushort-ulong-okp x (ulong-fix y))
         (shl-ushort-ulong-okp x y)))

Theorem: shl-ushort-ulong-okp-ulong-equiv-congruence-on-y

(defthm shl-ushort-ulong-okp-ulong-equiv-congruence-on-y
  (implies (ulong-equiv y y-equiv)
           (equal (shl-ushort-ulong-okp x y)
                  (shl-ushort-ulong-okp x y-equiv)))
  :rule-classes :congruence)