ggml : fix ppc64le build error and make cmake detect Power processors (#1284)

* Fix ppc64le build issue

* Added support to detect ppc64* processors

CMakeLists.txt

@@ -359,8 +359,11 @@ elseif (${CMAKE_SYSTEM_PROCESSOR} MATCHES "^(x86_64|i686|AMD64)$")
             add_compile_options(-mavx512vnni)
         endif()
     endif()
+elseif (${CMAKE_SYSTEM_PROCESSOR} MATCHES "ppc64")
+    message(STATUS "PowerPC detected")
+    add_compile_options(-mcpu=native -mtune=native)
+    #TODO: Add  targets for Power8/Power9 (Altivec/VSX) and Power10(MMA) and query for big endian systems (ppc64/le/be)
 else()
-    # TODO: support PowerPC
     message(STATUS "Unknown architecture")
 endif()
 

ggml.c

@@ -826,6 +826,7 @@ static void quantize_row_q4_0(const float * restrict x, void * restrict vy, int
         float max = 0.0f;
         float min = 0.0f;
 
+        vector float asrcv [8];
         vector float srcv [8];
         vector float maxv[8];
         vector float minv[8];