在有多个嵌套测试的 < code> if 内, 我该用什么来覆盖 gcc s
if((x<RADIUS && (forward?v<0:v>0)) || (x+RADIUS>dimensions[d] && (forward?v>0:v<0)))
我已尽我所能包罗万象:
#define likely(x) __builtin_expect((x),1)
#define unlikely(x) __builtin_expect((x),0)
if(unlikely(unlikely(unlikely(x<RADIUS) && likely(likely(forward)?likely(v<0):likely(v>0))) || unlikely(unlikely(x+RADIUS>dimensions[d]) && likely(likely(forward)?likely(v>0):likely(v<0)))))
我希望它只是一个过份的, 因为它几乎是 无法读取。
我不认为这里有错误的答案。 汇编者将使用您的提示来决定每个比较中的“ else” 案例的“ else” 案例; 这不仅是 C 代码, 而是在逻辑的 < em> 和 < em> 和 < em> 中, 信息越多越好 。
为了可以读的代码,我建议把它保留在大的东西上:每次如果声明一次,但是这并没有真正基于任何确凿的证据。
您是否考虑过使用 - fprofile-generate , 使用典型数据的代码运行代码, 然后用 < code>- fprofile- use 重建? 这样, 编译者就可以为所有这些案例建立自己的图片。 这是更便携的( 没有专门针对编译者的注释), 更易读, 以及更多未来的证据 。
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