浮点

• Either expression is a floating - point data type
  每个表达式都是浮点数据类型（
• Pushes a 32 - bit floating point number onto the stack
  将一个32位浮点数推入堆栈中。
• Value a single - precision floating point number to a
  值（单精度浮点数）转换为
• Pushes a 64 - bit floating point number onto the stack
  将一个64位浮点数推入堆栈中。
• Floating - point expressions do not compare as equal
  比较浮点表达式时不能获得等值结果
• Then a floating - point equality test is performed
  ，则执行浮点数相等测试。
• Do not use upper 96 floating - point registers
  不使用上面的96个浮点寄存器。
• Floating - point values are rounded from their native size type
  将浮点值从其本机大小（
• Adds a double - precision floating - point value into the
  存储区中添加一个双精度浮点值。
• Adds a single - precision floating - point value into the
  存储区中添加一个单精度浮点值。