Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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BSWAP Instruction
 Detail Key                               Up Contents Index Back
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  Title:    Byte Swap                             Flags: O D I T S Z A P C
            80486 Only                                   ═════════════════
                                                              -none-
  Syntax:   BSWAP register
 
  See also: .486
 
  Description:
 
     Takes a single 32-bit register as operand and exchanges the first
     byte with the fourth and the second byte with the third.
 
     This instruction does not alter any bit values within the bytes.
     Use BSWAP to translate quickly between 8086-family byte storage
     and storage schemes in which the high byte is stored first.
                                    -♦-