No. While the compiler can optimize memcpy calls to direct loads/stores for small arguments (when inlining the loads/stores would be smaller than the cost of ca

No. While the compiler can optimize memcpy calls to direct loads/stores for small arguments (when inlining the loads/stores would be smaller than the cost of calling memcpy), for bigger or not statically know sizes it WILL call to memcpy in libc. And in fact it may even emit memcpy calls for things like struct copies.