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One-byte-opcodes

X86-cwd/cdq/cqo

Signature
(x86-cwd/cdq/cqo proc-mode start-rip temp-rip prefixes rex-byte opcode modr/m sib x86) → x86
Returns: x86 — Type (x86p x86), given (x86p x86).

Definitions and Theorems

Function: x86-cwd/cdq/cqo

(defun x86-cwd/cdq/cqo
       (proc-mode start-rip temp-rip
                  prefixes rex-byte opcode modr/m sib x86)
 (declare (xargs :stobjs (x86)))
 (declare (type (integer 0 4) proc-mode)
          (type (signed-byte 48) start-rip)
          (type (signed-byte 48) temp-rip)
          (type (unsigned-byte 52) prefixes)
          (type (unsigned-byte 8) rex-byte)
          (type (unsigned-byte 8) opcode)
          (type (unsigned-byte 8) modr/m)
          (type (unsigned-byte 8) sib))
 (declare (ignorable proc-mode start-rip temp-rip
                     prefixes rex-byte opcode modr/m sib))
 (declare (xargs :guard (and (prefixes-p prefixes)
                             (modr/m-p modr/m)
                             (sib-p sib)
                             (rip-guard-okp proc-mode temp-rip))))
 (let ((__function__ 'x86-cwd/cdq/cqo))
  (declare (ignorable __function__))
  (b* ((?ctx 'x86-cwd/cdq/cqo))
    (b*
      (((the (integer 1 8) src-size)
        (select-operand-size proc-mode nil
                             rex-byte nil prefixes nil nil nil x86))
       (src (rgfi-size src-size *rax* rex-byte x86))
       (rdx (if (logbitp (1- (ash src-size 3)) src)
                (trunc src-size -1)
              0))
       (x86 (!rgfi-size src-size *rdx* rdx rex-byte x86))
       (x86 (write-*ip proc-mode temp-rip x86)))
      x86))))

Theorem: x86p-of-x86-cwd/cdq/cqo

(defthm x86p-of-x86-cwd/cdq/cqo
 (implies
    (x86p x86)
    (b* ((x86 (x86-cwd/cdq/cqo proc-mode start-rip temp-rip prefixes
                               rex-byte opcode modr/m sib x86)))
      (x86p x86)))
 :rule-classes :rewrite)