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Representation-of-integer-operations

Shr-ulong-ullong

Right shift of a value of type unsigned long and a value of type unsigned long long [C17:6.5.7].

Definitions and Theorems

Function: shr-ulong-ullong

(defun shr-ulong-ullong (x y)
  (declare (xargs :guard (and (ulongp x)
                              (ullongp y)
                              (shr-ulong-ullong-okp x y))))
  (shr-ulong x (integer-from-ullong y)))

Theorem: ulongp-of-shr-ulong-ullong

(defthm ulongp-of-shr-ulong-ullong
  (ulongp (shr-ulong-ullong x y)))

Theorem: shr-ulong-ullong-of-ulong-fix-x

(defthm shr-ulong-ullong-of-ulong-fix-x
  (equal (shr-ulong-ullong (ulong-fix x) y)
         (shr-ulong-ullong x y)))

Theorem: shr-ulong-ullong-ulong-equiv-congruence-on-x

(defthm shr-ulong-ullong-ulong-equiv-congruence-on-x
  (implies (ulong-equiv x x-equiv)
           (equal (shr-ulong-ullong x y)
                  (shr-ulong-ullong x-equiv y)))
  :rule-classes :congruence)

Theorem: shr-ulong-ullong-of-ullong-fix-y

(defthm shr-ulong-ullong-of-ullong-fix-y
  (equal (shr-ulong-ullong x (ullong-fix y))
         (shr-ulong-ullong x y)))

Theorem: shr-ulong-ullong-ullong-equiv-congruence-on-y

(defthm shr-ulong-ullong-ullong-equiv-congruence-on-y
  (implies (ullong-equiv y y-equiv)
           (equal (shr-ulong-ullong x y)
                  (shr-ulong-ullong x y-equiv)))
  :rule-classes :congruence)