I just installed Tensorflow 1.0.0 using pip. When running, I get warnings like the one shown below.
W tensorflow/core/platform/cpu_feature_guard.cc:45] The Ten
Those are simply warnings. They are just informing you if you build TensorFlow from source it can be faster on your machine.
Those instructions are not enabled by default on the builds available I think to be compatible with more CPUs as possible.