title: where can i find builtin gcc memcpy?
body: <p>In my program i use memcpy. Gcc generate code, that use __builtin___memcpy_chk. I  have downloaded gcc source code <a href="https://github.com/gcc-mirror/gcc" rel="nofollow noreferrer">https://github.com/gcc-mirror/gcc</a> and do grep -A 10 -R "__builtin___memcpy_chk" . but i can't find implementation __builtin___memcpy_chk. Where can i find implementation for this function? </p>