DOC ONLY: cmake / ninja build system doc

[vpp.git] / src / cmake / cpu.cmake

diff --git a/src/cmake/cpu.cmake b/src/cmake/cpu.cmake
index 9a0dfdd..1439be1 100644 (file)
--- a/src/cmake/cpu.cmake
+++ b/src/cmake/cpu.cmake
@@ -11,18 +11,53 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+##############################################################################
+# Cache line size detection
+##############################################################################
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
+  file(READ "/proc/cpuinfo" cpuinfo)
+  string(REPLACE "\n" ";" cpuinfo ${cpuinfo})
+  foreach(l ${cpuinfo})
+    string(REPLACE ":" ";" l ${l})
+    list(GET l 0 name)
+    list(GET l 1 value)
+    string(STRIP ${name} name)
+    string(STRIP ${value} value)
+    if(${name} STREQUAL "CPU implementer")
+      set(CPU_IMPLEMENTER ${value})
+     endif()
+    if(${name} STREQUAL "CPU part")
+      set(CPU_PART ${value})
+     endif()
+  endforeach()
+  # Implementer 0x0a1 - Cavium
+  #  Part 0x0a1 - ThunderX
+  if (${CPU_IMPLEMENTER} STREQUAL "0x43" AND ${CPU_PART} STREQUAL "0x0a1")
+    set(VPP_LOG2_CACHE_LINE_SIZE 7)
+  else()
+    set(VPP_LOG2_CACHE_LINE_SIZE 6)
+  endif()
+  math(EXPR VPP_CACHE_LINE_SIZE "1 << ${VPP_LOG2_CACHE_LINE_SIZE}")
+  message(STATUS "ARM AArch64 CPU implementer ${CPU_IMPLEMENTER} part ${CPU_PART} cacheline size ${VPP_CACHE_LINE_SIZE}")
+else()
+  set(VPP_LOG2_CACHE_LINE_SIZE 6)
+endif()
+
+set(VPP_LOG2_CACHE_LINE_SIZE ${VPP_LOG2_CACHE_LINE_SIZE}
+    CACHE STRING "Target CPU cache line size (power of 2)")
+
 ##############################################################################
 # CPU optimizations and multiarch support
 ##############################################################################
 if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
   set(CMAKE_C_FLAGS "-march=corei7 -mtune=corei7-avx ${CMAKE_C_FLAGS}")
   set(VPP_LIB_DIR_NAME lib64)
-  check_c_compiler_flag("-march=core-avx2" AVX2)
-  if(AVX2)
+  check_c_compiler_flag("-march=core-avx2" compiler_flag_march_core_avx2)
+  if(compiler_flag_march_core_avx2)
     list(APPEND MARCH_VARIANTS "avx2\;-march=core-avx2 -mtune=core-avx2")
   endif()
-  check_c_compiler_flag("-march=skylake-avx512" AVX512)
-  if(AVX512)
+  check_c_compiler_flag("-march=skylake-avx512" compiler_flag_march_skylake_avx512)
+  if(compiler_flag_march_skylake_avx512)
     list(APPEND MARCH_VARIANTS "avx512\;-march=skylake-avx512 -mtune=skylake-avx512")
   endif()
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")