		Search-engine friendly clone of the ACL2 documentation.

State-stobj

Read1-xreg-signed32

Refine read-xreg-signed32 to use the stobj states.

Definitions and Theorems

Function: read1-xreg-signed32

(defun read1-xreg-signed32 (reg stat feat)
 (declare (xargs :non-executable t))
 (declare
  (xargs :guard (non-exec (and (stat1p stat)
                               (natp reg)
                               (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 'read1-xreg-signed32
                                    (list reg stat feat))
         (if (acl2::mbt$ (stat1p stat))
             (logext 32
                     (read-xreg-unsigned reg (stat-from-stat1 stat)
                                         feat))
           0)))

Theorem: read1-xreg-signed32-to-read-xreg-signed32

(defthm read1-xreg-signed32-to-read-xreg-signed32
  (implies (stat1p stat)
           (equal (read1-xreg-signed32 reg stat feat)
                  (read-xreg-signed32 reg (stat-from-stat1 stat)
                                      feat)))
  :rule-classes :rewrite)

Theorem: read-xreg-signed32-to-read1-xreg-signed32

(defthm read-xreg-signed32-to-read1-xreg-signed32
  (implies (statp stat)
           (equal (read-xreg-signed32 reg stat feat)
                  (read1-xreg-signed32 reg (stat1-from-stat stat)
                                       feat)))
  :rule-classes :rewrite)