2.63 修复 srl-src.c 中参数 k == 0 时的错误 #20
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在 C 语言中 x << s 实际上是 x << ( s%w ) ，其中 w 为 x 的位宽度。 所以，当 k == 0 时， -1 << (w-k) 并没有进行左移。
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在 C 语言中 x << s 实际上是 x << ( s%w ) ，其中 w 为 x 的位宽度。
所以，当 k == 0 时， -1 << (w-k) 并没有进行左移。