Building tensorflow using Bazel with cpu optimizations

tensorflow_build.sh

# Install bazel
# download tensorflow src
# Checkout tagged version
# ./configure

# Compile
bazel build -c opt --copt=-march=native //tensorflow/tools/pip_package:build_pip_package
#bazel build -c opt --copt=-mavx --copt=-msse4.1 --copt=-msse4.2 //tensorflow/tools/pip_package:build_pip_package

# Build the PIP package
bazel-bin/tensorflow/tools/pip_package/build_pip_package /tmp/tensorflow_pkg

# uninstall previous tensorflow version (if applicable)
# Install PIP package
pip install /tmp/tensorflow_pkg/tensorflow-1.2.0rc2-cp27-cp27m-macosx_10_12_x86_64.whl

# References
# https://www.tensorflow.org/install/install_sources
# https://stackoverflow.com/questions/41293077/how-to-compile-tensorflow-with-sse4-2-and-avx-instructions
# https://en.wikipedia.org/wiki/Advanced_Vector_Extensions#AVX2
# https://en.wikipedia.org/wiki/SSE4
# https://en.wikipedia.org/wiki/FMA_instruction_set
# https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gcc/x86-Options.html#x86-Options
# https://gcc.gnu.org/onlinedocs/gcc-4.5.3/gcc/i386-and-x86_002d64-Options.html