c - 是否有任何现有的 C 实现在(无)符号整数表示中具有填充位？

Question

根据 C99，signed int 或 unsigned int 表示中可能有填充位。所以我想知道是否还有任何实现具有这种过时的东西？

Answer 1

来自 The New C Standard :

On some Cray processors the type short has 32 bits of precision but is held in 64 bits worth of storage. The Unisys A Series unsigned integer type contains a padding bit that is treated as a sign bit in the signed integer representation.

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The Harris/6 computer represented the type long using two consecutive int types. This meant that the sign bit of one of the ints had to be ignored; it was treated as a padding bit. The value representation of the type int is 24 bits wide, and long had a value representation of 47 bits with one padding bit.