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• Prefix-modrm-sib-decoding

32-bit-compute-mandatory-prefix-for-0f-3a-three-byte-opcode

Signature

(32-bit-compute-mandatory-prefix-for-0f-3a-three-byte-opcode 
     opcode prefixes) 
 
  → 
mandatory-prefix

Arguments

opcode — Relevant opcode byte.

Returns

mandatory-prefix — Type (unsigned-byte-p 8 mandatory-prefix).

Definitions and Theorems

Function: 32-bit-compute-mandatory-prefix-for-0f-3a-three-byte-opcode$inline

(defun
 32-bit-compute-mandatory-prefix-for-0f-3a-three-byte-opcode$inline
 (opcode prefixes)
 (declare (type (unsigned-byte 8) opcode)
          (type (unsigned-byte 52) prefixes))
 (declare (xargs :guard (prefixes-p prefixes)))
 (let
  ((__function__
      '32-bit-compute-mandatory-prefix-for-0f-3a-three-byte-opcode))
  (declare (ignorable __function__))
  (let ((rep-pfx (the (unsigned-byte 8)
                      (prefixes->rep prefixes))))
    (if (not (eql rep-pfx 0))
        (if (or (and (equal rep-pfx 243)
                     (aref1 '32-bit-mode-0f-3a-three-byte-f3-ok
                            *32-bit-mode-0f-3a-three-byte-f3-ok-ar*
                            opcode))
                (and (equal rep-pfx 242)
                     (aref1 '32-bit-mode-0f-3a-three-byte-f2-ok
                            *32-bit-mode-0f-3a-three-byte-f2-ok-ar*
                            opcode)))
            rep-pfx
          0)
      (let ((opr-pfx (the (unsigned-byte 8)
                          (prefixes->opr prefixes))))
        (if (not (eql opr-pfx 0))
            (if (aref1 '32-bit-mode-0f-3a-three-byte-66-ok
                       *32-bit-mode-0f-3a-three-byte-66-ok-ar*
                       opcode)
                opr-pfx
              0)
          0))))))

Theorem: return-type-of-32-bit-compute-mandatory-prefix-for-0f-3a-three-byte-opcode

(defthm
 return-type-of-32-bit-compute-mandatory-prefix-for-0f-3a-three-byte-opcode
 (b* ((mandatory-prefix (32-bit-compute-mandatory-prefix-for-0f-3a-three-byte-opcode$inline
                             opcode prefixes)))
   (unsigned-byte-p 8 mandatory-prefix))
 :rule-classes :rewrite)