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• Modr/m-decoding

32-bit-mode-0f-3a-three-byte-opcode-modr/m-p

Returns a boolean saying whether, in 32-bit mode, the given opcode in the second three-byte opcode map expects a ModR/M byte.

Signature

(32-bit-mode-0f-3a-three-byte-opcode-modr/m-p 
     mandatory-prefix opcode) 
 
  → 
bool

Arguments

opcode — Third byte of the 3A three-byte opcode.

Returns

bool — Type (booleanp bool), given (n08p opcode).

Definitions and Theorems

Function: 32-bit-mode-0f-3a-three-byte-opcode-modr/m-p

(defun 32-bit-mode-0f-3a-three-byte-opcode-modr/m-p
       (mandatory-prefix opcode)
 (declare (type (unsigned-byte 8)
                mandatory-prefix)
          (type (unsigned-byte 8) opcode))
 (let ((__function__ '32-bit-mode-0f-3a-three-byte-opcode-modr/m-p))
  (declare (ignorable __function__))
  (case mandatory-prefix
    (102 (aref1 '32-bit-mode-0f-3a-three-byte-66-has-modr/m
                *32-bit-mode-0f-3a-three-byte-66-has-modr/m-ar*
                opcode))
    (243 (aref1 '32-bit-mode-0f-3a-three-byte-f3-has-modr/m
                *32-bit-mode-0f-3a-three-byte-f3-has-modr/m-ar*
                opcode))
    (242 (aref1 '32-bit-mode-0f-3a-three-byte-f2-has-modr/m
                *32-bit-mode-0f-3a-three-byte-f2-has-modr/m-ar*
                opcode))
    (t (aref1 '32-bit-mode-0f-3a-three-byte-no-prefix-has-modr/m
              *32-bit-mode-0f-3a-three-byte-no-prefix-has-modr/m-ar*
              opcode)))))

Theorem: booleanp-of-32-bit-mode-0f-3a-three-byte-opcode-modr/m-p

(defthm booleanp-of-32-bit-mode-0f-3a-three-byte-opcode-modr/m-p
  (implies (n08p opcode)
           (b* ((bool (32-bit-mode-0f-3a-three-byte-opcode-modr/m-p
                           mandatory-prefix opcode)))
             (booleanp bool)))
  :rule-classes :rewrite)