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doc/go_mem.html
*p += i </pre> <p> If <code>i</code> and <code>*p</code> start equal to 2, the original code does <code>*p = 3</code>, so a racing thread can read only 2 or 3 from <code>*p</code>. The rewritten code does <code>*p = 1</code> and then <code>*p = 3</code>, allowing a racing thread to read 1 as well. </p> <p> Note that all these optimizations are permitted in C/C++ compilers:
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