Build option to disable fast math (#2822)

* Added build option to disable fast math

* Change option name

CMakeLists.txt

@@ -178,6 +178,7 @@ option(NGRAPH_LIB_VERSIONING_ENABLE "Enable shared library versioning" FALSE)
 option(NGRAPH_PYTHON_BUILD_ENABLE "Enable build nGraph python package wheel" FALSE)
 option(NGRAPH_PLAIDML_ENABLE "Enable the PlaidML backend" ${PLAIDML_FOUND})
 option(NGRAPH_DISTRIBUTED_ENABLE "Enable distributed training using MLSL/OpenMPI" OFF)
+option(NGRAPH_FAST_MATH_ENABLE "Enable fast math" ON)
 option(NGRAPH_JSON_ENABLE "Enable JSON based serialization and tracing features" TRUE)
 option(NGRAPH_STATIC_LIB_ENABLE "Enable build nGraph static library" FALSE)
 

src/ngraph/runtime/cpu/CMakeLists.txt

@@ -171,6 +171,10 @@ if (NGRAPH_CPU_ENABLE)
         add_dependencies(cpu_backend ext_halide)
     endif()
 
+    if(NOT NGRAPH_FAST_MATH_ENABLE)
+        target_compile_definitions(cpu_backend PRIVATE EIGEN_FAST_MATH=0)
+    endif()
+
     if(OPENMP_FOUND)
         target_compile_options(cpu_backend PRIVATE "${OpenMP_CXX_FLAGS}")
         if (NOT WIN32)