首先，表示指数的8位应该是从- 128到127，就像带符号的字节一样。
First, eight bits for the exponent should represent -128 to 127, just like a signed byte.
longdoubleIEEE双字节扩展浮点数15位指数，64位带符号小数。
Long double IEEE double extended floating point exponent of 15 bits and signed fraction of 64 bits.
longdoubleIEEE双字节扩展浮点数15位指数，64位带符号小数。
Long double IEEE double extended floating point exponent of 15 bits and signed fraction of 64 bits.
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