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X86-sarx/shlx/shrx

SARX/SHLX/SHRX: Shift without affecting flags.

Signature

(x86-sarx/shlx/shrx proc-mode 
                    start-rip temp-rip prefixes rex-byte 
                    vex-prefixes opcode modr/m sib x86) 
 
  → 
x86

Returns

x86 — Type (x86p x86), given (x86p x86).

Definitions and Theorems

Function: x86-sarx/shlx/shrx

(defun x86-sarx/shlx/shrx
       (proc-mode start-rip temp-rip prefixes rex-byte
                  vex-prefixes 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 24) vex-prefixes)
          (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)
                             (vex-prefixes-byte0-p vex-prefixes))))
 (let ((__function__ 'x86-sarx/shlx/shrx))
  (declare (ignorable __function__))
  (b* ((?ctx 'x86-sarx/shlx/shrx)
       (?r/m (the (unsigned-byte 3)
                  (modr/m->r/m modr/m)))
       (?mod (the (unsigned-byte 2)
                  (modr/m->mod modr/m)))
       (?reg (the (unsigned-byte 3)
                  (modr/m->reg modr/m))))
   (b*
    ((p2 (prefixes->seg prefixes))
     (p4? (equal 103 (prefixes->adr prefixes)))
     (seg-reg
         (select-segment-register proc-mode p2 p4? mod r/m sib x86))
     (rex-byte (rex-byte-from-vex-prefixes vex-prefixes))
     ((the (integer 4 8) operand-size)
      (if (and (equal proc-mode 0)
               (equal (vex->w vex-prefixes) 1))
          8
        4))
     (inst-ac? t)
     ((mv flg val-to-shift & & x86)
      (x86-operand-from-modr/m-and-sib-bytes
           proc-mode *gpr-access*
           operand-size inst-ac? nil seg-reg p4?
           temp-rip rex-byte r/m mod sib 0 x86))
     ((when flg)
      (!!ms-fresh :x86-operand-from-modr/m-and-sib-bytes flg))
     (cnt-reg (vex-vvvv-reg-index (vex->vvvv vex-prefixes)))
     (cnt-to-shift (rgfi-size operand-size cnt-reg rex-byte x86))
     (cnt-mask (if (= operand-size 4) 31 63))
     (cnt-to-shift (logand cnt-to-shift cnt-mask))
     (result
          (case (vex->pp vex-prefixes)
            (1 (shlx-spec operand-size val-to-shift cnt-to-shift))
            (2 (sarx-spec operand-size val-to-shift cnt-to-shift))
            (3 (shrx-spec operand-size val-to-shift cnt-to-shift))
            (otherwise 0)))
     (x86 (!rgfi-size operand-size (reg-index reg rex-byte 2)
                      result rex-byte x86))
     (x86 (write-*ip proc-mode temp-rip x86)))
    x86))))

Theorem: x86p-of-x86-sarx/shlx/shrx

(defthm x86p-of-x86-sarx/shlx/shrx
 (implies
   (x86p x86)
   (b*
     ((x86 (x86-sarx/shlx/shrx proc-mode
                               start-rip temp-rip prefixes rex-byte
                               vex-prefixes opcode modr/m sib x86)))
     (x86p x86)))
 :rule-classes :rewrite)