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• Mmx-registers-reads-and-writes

Mmx-instruction-updates

We set the FPU tag and TOS field to 00B (valid) and 000B respectively. This function accounts for the effects of all MMX instructions except EMMS.

Signature

(mmx-instruction-updates x86) → x86

Definitions and Theorems

Function: mmx-instruction-updates$inline

(defun mmx-instruction-updates$inline (x86)
  (declare (xargs :stobjs (x86)))
  (declare (xargs :guard t))
  (b* ((x86 (!fp-tag 0 x86))
       (fp-status (fp-status x86))
       (x86 (!fp-status (!fp-statusbits->top 0 fp-status)
                        x86)))
    x86))

Theorem: x86p-mmx-instruction-updates

(defthm x86p-mmx-instruction-updates
  (implies (x86p x86)
           (x86p (mmx-instruction-updates x86))))