[non-normative] Change default build settings

This patch changes the default build settings to disable
both multi-threading and SIMD on the normative branch, as
requested by the AOMedia Codec Working Group.

Change-Id: If7971d3b9d276b8dd5e189dd950697387fddfa72

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12b7cc5..e3c8591 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,6 +18,12 @@
   endif()
 endif()
 
+if(NOT AOM_TARGET_CPU)
+  set(AOM_TARGET_CPU generic)
+  message("Forcing generic build for normative branch; set AOM_TARGET_CPU to "
+          "the target CPU type to allow for an optimized build.")
+endif()
+
 option(ENABLE_CCACHE "Enable ccache support." OFF)
 option(ENABLE_DECODE_PERF_TESTS "Enables decoder performance tests" OFF)
 option(ENABLE_DISTCC "Enable distcc support." OFF)

build/cmake/aom_config_defaults.cmake

diff --git a/build/cmake/aom_config_defaults.cmake b/build/cmake/aom_config_defaults.cmake
index 36ca34e..5113cb3 100644
--- a/build/cmake/aom_config_defaults.cmake
+++ b/build/cmake/aom_config_defaults.cmake
@@ -59,7 +59,7 @@
 set(CONFIG_GPROF 0 CACHE NUMBER "Enable gprof support.")
 set(CONFIG_LIBYUV 1 CACHE NUMBER "Enables libyuv scaling/conversion support.")
 set(CONFIG_MSVS 0 CACHE NUMBER "Building with MS Visual Studio (detected).")
-set(CONFIG_MULTITHREAD 1 CACHE NUMBER "Multithread support.")
+set(CONFIG_MULTITHREAD 0 CACHE NUMBER "No multithread support.")
 set(CONFIG_OS_SUPPORT 0 CACHE NUMBER "Internal flag.")
 set(CONFIG_PIC 0 CACHE NUMBER "Build with PIC enabled.")
 set(CONFIG_RUNTIME_CPU_DETECT 1 CACHE NUMBER "Runtime CPU detection support.")

test/av1_round_shift_array_test.cc

diff --git a/test/av1_round_shift_array_test.cc b/test/av1_round_shift_array_test.cc
index 825d134..67ec12d 100644
--- a/test/av1_round_shift_array_test.cc
+++ b/test/av1_round_shift_array_test.cc
@@ -27,9 +27,9 @@
 
 typedef void (*comp_round_shift_array_func)(int32_t *arr, int size, int bit);
 
-const int kValidBitCheck[] = {
-  -4, -3, -2, -1, 0, 1, 2, 3, 4,
-};
+#if HAVE_SSE4_1 || HAVE_NEON
+  const int kValidBitCheck[] = {-4, -3, -2, -1, 0, 1, 2, 3, 4};
+#endif
 
 typedef ::testing::tuple<comp_round_shift_array_func, BLOCK_SIZE, int>
     CompRoundShiftParam;

test/decode_multithreaded_test.cc

diff --git a/test/decode_multithreaded_test.cc b/test/decode_multithreaded_test.cc
index ed9a9ce..3cefb4b 100644
--- a/test/decode_multithreaded_test.cc
+++ b/test/decode_multithreaded_test.cc
@@ -134,21 +134,25 @@
 // and multi thread. Ensure that the MD5 of the output in both cases
 // is identical. If so, the test passes.
 TEST_P(AV1DecodeMultiThreadedTest, MD5Match) {
+#if CONFIG_MULTITHREAD
   cfg_.large_scale_tile = 0;
   single_thread_dec_->Control(AV1_SET_TILE_MODE, 0);
   for (int i = 0; i < kNumMultiThreadDecoders; ++i)
     multi_thread_dec_[i]->Control(AV1_SET_TILE_MODE, 0);
   DoTest();
+#endif
 }
 
 class AV1DecodeMultiThreadedTestLarge : public AV1DecodeMultiThreadedTest {};
 
 TEST_P(AV1DecodeMultiThreadedTestLarge, MD5Match) {
+#if CONFIG_MULTITHREAD
   cfg_.large_scale_tile = 0;
   single_thread_dec_->Control(AV1_SET_TILE_MODE, 0);
   for (int i = 0; i < kNumMultiThreadDecoders; ++i)
     multi_thread_dec_[i]->Control(AV1_SET_TILE_MODE, 0);
   DoTest();
+#endif
 }
 
 // TODO(ranjit): More tests have to be added using pre-generated MD5.
@@ -163,12 +167,14 @@
 class AV1DecodeMultiThreadedLSTestLarge
     : public AV1DecodeMultiThreadedTestLarge {};
 
-TEST_P(AV1DecodeMultiThreadedLSTestLarge, DISABLED_MD5Match) {
+TEST_P(AV1DecodeMultiThreadedLSTestLarge, MD5Match) {
+#if CONFIG_MULTITHREAD
   cfg_.large_scale_tile = 1;
   single_thread_dec_->Control(AV1_SET_TILE_MODE, 1);
   for (int i = 0; i < kNumMultiThreadDecoders; ++i)
     multi_thread_dec_[i]->Control(AV1_SET_TILE_MODE, 1);
   DoTest();
+#endif
 }
 
 AV1_INSTANTIATE_TEST_CASE(AV1DecodeMultiThreadedLSTestLarge,

test/ethread_test.cc

diff --git a/test/ethread_test.cc b/test/ethread_test.cc
index 3dcc2a7..871d66b 100644
--- a/test/ethread_test.cc
+++ b/test/ethread_test.cc
@@ -160,17 +160,21 @@
 };
 
 TEST_P(AVxEncoderThreadTest, EncoderResultTest) {
+#if CONFIG_MULTITHREAD
   cfg_.large_scale_tile = 0;
   decoder_->Control(AV1_SET_TILE_MODE, 0);
   DoTest();
+#endif
 }
 
 class AVxEncoderThreadTestLarge : public AVxEncoderThreadTest {};
 
 TEST_P(AVxEncoderThreadTestLarge, EncoderResultTest) {
+#if CONFIG_MULTITHREAD
   cfg_.large_scale_tile = 0;
   decoder_->Control(AV1_SET_TILE_MODE, 0);
   DoTest();
+#endif
 }
 
 // For AV1, only test speed 0 to 3.