		Search-engine friendly clone of the ACL2 documentation.

State-stobj

Write1-xreg-32

Refine write-xreg-32 to use the stobj states.

Definitions and Theorems

Function: write1-xreg-32

(defun write1-xreg-32 (reg val stat feat)
 (declare (xargs :non-executable t))
 (declare
  (xargs :guard (non-exec (and (stat1p stat)
                               (natp reg)
                               (integerp val)
                               (statp (stat-from-stat1 stat))
                               (featp feat)
                               (feat-64p feat)
                               (stat-validp (stat-from-stat1 stat)
                                            feat)
                               (< (lnfix reg) (feat->xnum feat))))))
 (prog2$ (acl2::throw-nonexec-error 'write1-xreg-32
                                    (list reg val stat feat))
         (if (acl2::mbt$ (stat1p stat))
             (write-xreg reg (logext 32 val)
                         (stat-from-stat1 stat)
                         feat)
           0)))

Theorem: write1-xreg-32-to-write-xreg-32

(defthm write1-xreg-32-to-write-xreg-32
  (implies (stat1p stat)
           (equal (write1-xreg-32 reg val stat feat)
                  (write-xreg-32 reg val (stat-from-stat1 stat)
                                 feat)))
  :rule-classes :rewrite)

Theorem: write-xreg-32-to-write1-xreg-32

(defthm write-xreg-32-to-write1-xreg-32
  (implies (statp stat)
           (equal (write-xreg-32 reg val stat feat)
                  (write1-xreg-32 reg val (stat1-from-stat stat)
                                  feat)))
  :rule-classes :rewrite)