允许前导零，但原始实现从来不会返回前导零。
Leading zeros are allowed, however our original implementation never returns leading zeros.
计算前导零，然后从 31 中减去前导零数量，就可以将产生的掩码转换为索引。
You can translate the resulting mask back into a single index by counting the leading zeroes, and then subtracting that from 31. A possible assembly language instruction sequence to do this would be
映射文件中的全局符号通常有一个或多个前导下划线，因为编译器向变量名添加前导下划线。
Global symbols in a mapfile usually have one or more leading underscores because the compiler adds a leading underscore to variable names.
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