assimp.assimp/contrib/draco/cmake/draco_cpu_detection.cmake

# Copyright 2021 The Draco Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.

if(DRACO_CMAKE_DRACO_CPU_DETECTION_CMAKE_)
  return()
endif() # DRACO_CMAKE_DRACO_CPU_DETECTION_CMAKE_
set(DRACO_CMAKE_DRACO_CPU_DETECTION_CMAKE_ 1)

# Detect optimizations available for the current target CPU.
macro(draco_optimization_detect)
  if(DRACO_ENABLE_OPTIMIZATIONS)
    string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" cpu_lowercase)
    if(cpu_lowercase MATCHES "^arm|^aarch64")
      set(draco_have_neon ON)
    elseif(cpu_lowercase MATCHES "^x86|amd64")
      set(draco_have_sse4 ON)
    endif()
  endif()

  if(draco_have_neon AND DRACO_ENABLE_NEON)
    list(APPEND draco_defines "DRACO_ENABLE_NEON=1")
  else()
    list(APPEND draco_defines "DRACO_ENABLE_NEON=0")
  endif()

  if(draco_have_sse4 AND DRACO_ENABLE_SSE4_1)
    list(APPEND draco_defines "DRACO_ENABLE_SSE4_1=1")
  else()
    list(APPEND draco_defines "DRACO_ENABLE_SSE4_1=0")
  endif()
endmacro()