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Rv32im-le-states

Write32-mem-ubyte8

Write an unsigned 8-bit integer to memory.

Signature
(write32-mem-ubyte8 addr val stat) → new-stat
Arguments: addr — Guard (integerp addr).; val — Guard (ubyte8p val).; stat — Guard (stat32p stat).
Returns: new-stat — Type (stat32p new-stat).

The address is any integer, which we turn into a 32-bit unsigned address.

Definitions and Theorems

Function: write32-mem-ubyte8

(defun write32-mem-ubyte8 (addr val stat)
  (declare (xargs :guard (and (integerp addr)
                              (ubyte8p val)
                              (stat32p stat))))
  (change-stat32 stat
                 :memory (update-nth (loghead 32 addr)
                                     (loghead 8 val)
                                     (stat32->memory stat))))

Theorem: stat32p-of-write32-mem-ubyte8

(defthm stat32p-of-write32-mem-ubyte8
  (b* ((new-stat (write32-mem-ubyte8 addr val stat)))
    (stat32p new-stat))
  :rule-classes :rewrite)

Theorem: write32-mem-ubyte8-of-ifix-addr

(defthm write32-mem-ubyte8-of-ifix-addr
  (equal (write32-mem-ubyte8 (ifix addr)
                             val stat)
         (write32-mem-ubyte8 addr val stat)))

Theorem: write32-mem-ubyte8-int-equiv-congruence-on-addr

(defthm write32-mem-ubyte8-int-equiv-congruence-on-addr
  (implies (acl2::int-equiv addr addr-equiv)
           (equal (write32-mem-ubyte8 addr val stat)
                  (write32-mem-ubyte8 addr-equiv val stat)))
  :rule-classes :congruence)

Theorem: write32-mem-ubyte8-of-stat32-fix-stat

(defthm write32-mem-ubyte8-of-stat32-fix-stat
  (equal (write32-mem-ubyte8 addr val (stat32-fix stat))
         (write32-mem-ubyte8 addr val stat)))

Theorem: write32-mem-ubyte8-stat32-equiv-congruence-on-stat

(defthm write32-mem-ubyte8-stat32-equiv-congruence-on-stat
  (implies (stat32-equiv stat stat-equiv)
           (equal (write32-mem-ubyte8 addr val stat)
                  (write32-mem-ubyte8 addr val stat-equiv)))
  :rule-classes :congruence)