Initial ppc64le support

Signed-off-by: mgiessing <[email protected]>

cmake/libs/libfaiss.cmake

@@ -44,6 +44,13 @@ if(__AARCH64)
   target_link_libraries(knowhere_utils PUBLIC glog::glog)
 endif()
 
+# ToDo: Add distances_vsx.cc for powerpc64 SIMD acceleration
+if(__PPC64)
+  set(UTILS_SRC src/simd/hook.cc src/simd/distances_ref.cc)
+  add_library(knowhere_utils STATIC ${UTILS_SRC})
+  target_link_libraries(knowhere_utils PUBLIC glog::glog)
+endif()
+
 if(LINUX)
   set(BLA_VENDOR OpenBLAS)
 endif()
@@ -125,3 +132,27 @@ if(__AARCH64)
                                      ${LAPACK_LIBRARIES} knowhere_utils)
   target_compile_definitions(faiss PRIVATE FINTEGER=int)
 endif()
+
+if(__PPC64)
+  knowhere_file_glob(GLOB FAISS_AVX_SRCS thirdparty/faiss/faiss/impl/*avx.cpp)
+
+  list(REMOVE_ITEM FAISS_SRCS ${FAISS_AVX_SRCS})
+  add_library(faiss STATIC ${FAISS_SRCS})
+
+  target_compile_options(
+    faiss
+    PRIVATE $<$<COMPILE_LANGUAGE:CXX>:
+            -mcpu=native
+            -mvsx
+            -Wno-sign-compare
+            -Wno-unused-variable
+            -Wno-reorder
+            -Wno-unused-local-typedefs
+            -Wno-unused-function
+            -Wno-strict-aliasing>)
+
+  add_dependencies(faiss knowhere_utils)
+  target_link_libraries(faiss PUBLIC OpenMP::OpenMP_CXX ${BLAS_LIBRARIES}
+                                     ${LAPACK_LIBRARIES} knowhere_utils)
+  target_compile_definitions(faiss PRIVATE FINTEGER=int)
+endif()

cmake/utils/platform_check.cmake

@@ -3,9 +3,10 @@ include(CheckSymbolExists)
 macro(detect_target_arch)
   check_symbol_exists(__aarch64__ "" __AARCH64)
   check_symbol_exists(__x86_64__ "" __X86_64)
+  check_symbol_exists(__powerpc64__ "" __PPC64)
 
-  if(NOT __AARCH64 AND NOT __X86_64)
-    message(FATAL "knowhere only support amd64 and arm64.")
+  if(NOT __AARCH64 AND NOT __X86_64 AND NOT __PPC64)
+    message(FATAL "knowhere only support amd64, ppc64 and arm64 architecture.")
   endif()
 endmacro()