> > > In general things don't get optimized across function calls, except in > case of inlinable functions. > > And for compiler attributes it's the opposite,__attribute__((const)) and > __attribute((pure)) can be used to indicate some kind of safety to optimize > across functions. > > https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html > > This is true, but LTO increases the compiler's ability to make these sorts of optimizations across function calls and even C source file boundaries without you needing to explicitly mark functions as such.
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