1 files changed, 49 insertions, 0 deletions
diff --git a/cmake/libgav1_cpu_detection.cmake b/cmake/libgav1_cpu_detection.cmake
new file mode 100644
index 0000000..e17e27c
--- /dev/null
+++ b/cmake/libgav1_cpu_detection.cmake
@@ -0,0 +1,49 @@
+# Copyright 2019 The libgav1 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(LIBGAV1_CMAKE_LIBGAV1_CPU_DETECTION_CMAKE_)
+  return()
+endif() # LIBGAV1_CMAKE_LIBGAV1_CPU_DETECTION_CMAKE_
+set(LIBGAV1_CMAKE_LIBGAV1_CPU_DETECTION_CMAKE_ 1)
+
+# Detect optimizations available for the current target CPU.
+macro(libgav1_optimization_detect)
+  if(LIBGAV1_ENABLE_OPTIMIZATIONS)
+    string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" cpu_lowercase)
+    if(cpu_lowercase MATCHES "^arm|^aarch64")
+      set(libgav1_have_neon ON)
+    elseif(cpu_lowercase MATCHES "^x86|amd64")
+      set(libgav1_have_avx2 ON)
+      set(libgav1_have_sse4 ON)
+    endif()
+  endif()
+
+  if(libgav1_have_avx2 AND LIBGAV1_ENABLE_AVX2)
+    list(APPEND libgav1_defines "LIBGAV1_ENABLE_AVX2=1")
+  else()
+    list(APPEND libgav1_defines "LIBGAV1_ENABLE_AVX2=0")
+  endif()
+
+  if(libgav1_have_neon AND LIBGAV1_ENABLE_NEON)
+    list(APPEND libgav1_defines "LIBGAV1_ENABLE_NEON=1")
+  else()
+    list(APPEND libgav1_defines "LIBGAV1_ENABLE_NEON=0")
+  endif()
+
+  if(libgav1_have_sse4 AND LIBGAV1_ENABLE_SSE4_1)
+    list(APPEND libgav1_defines "LIBGAV1_ENABLE_SSE4_1=1")
+  else()
+    list(APPEND libgav1_defines "LIBGAV1_ENABLE_SSE4_1=0")
+  endif()
+endmacro()