On Thu, 24 May 2018, Liu Hao wrote:
在 2018/5/24 1:35, Martin Storsjö 写道:
I guess that's doable (I guess you mean __SIZEOF_LONG__ * 8?), although
I'd maybe rather use "sizeof(Mask) * 8" instead.
// Martin
`__*_WIDTH__` macros are documented on
<https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html>
That seems like a very new addition, too new to rely on. Notice how it is
present in the 7.1.0 docs [1] but missing in the 6.1.0 docs [2].
Additionally, clang does seem to define this kind of macros, but not all
of them (it defines e.g. __SIZE_WIDTH__ but not __LONG_WIDTH__).
[1] https://gcc.gnu.org/onlinedocs/gcc-7.1.0/cpp/Common-Predefined-Macros.html
[2] https://gcc.gnu.org/onlinedocs/gcc-6.1.0/cpp/Common-Predefined-Macros.html
// Martin
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