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 FLDENV mem     │ fldenv [bp+10]          │  87 (35-45)+EA
 FLDENVW mem*   │                         │ 287 35-45
 FLDENVD mem*   │                         │ 387 71
                │                         │ 486 44,pm=34
────────────────┼─────────────────────────┼─────────────────────────────────
 FSTENV mem     │ fstenv [bp-14]          │  87 (40-50)+EA
 FSTENVW mem*   │                         │ 287 40-50
 FSTENVD mem*   │                         │ 387 103-104
 FNSTENV mem    │                         │ 486 67,pm=56
 FNSTENVW mem*  │                         │
 FNSTENVD mem*  │                         │
────────────────┴─────────────────────────┴─────────────────────────────────
  * 80387/486 only.
 
  NOTE: The timings reflect the no-wait versions of FSTENV. The wait
        versions may take additional clock cycles.
                                    -♦-