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引自https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html :
-falign-labels
-falign-labels=n
Align all branch targets to a power-of-two boundary, skipping up to n bytes like -falign-functions. This option can easily make code slower, because it must insert dummy operations for when the branch target is reached in the usual flow of the code.
-fno-align-labels and -falign-labels=1 are equivalent and mean that labels are not aligned.
If -falign-loops or -falign-jumps are applicable and are greater than this value, then their values are used instead.
If n is not specified or is zero, use a machine-dependent default which is very likely to be ‘1’, meaning no alignment.
Enabled at levels -O2, -O3.
更多地考虑这个标志会使它失去更多的意义......引发代码缓存未命中的后果，以及当参数采用数值 (1..) 时甚至启用意味着什么？