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cf4185c4e3
Add a benchmark that compares codegen-autodiff versus old autodiff on the snavely reprojection error cost function. This creates two new cmake targets: codegen_ba_benchmark codegen_ba_benchark_fast_math The second one is only enabled on Clang and includes all known optimizations. Change-Id: Ibc30dc8b67b4c0fece41142914f9118f16ff1e20