Merge pull request #1666 from gangliao/sse_def

Add simd check and set SSE3 as default compilation

Author: gangliao

paddle/utils/CpuId.h

@@ -12,6 +12,7 @@ limitations under the License. */
 #pragma once
 
 #include "Common.h"
+#include "Error.h"
 
 namespace paddle {
 
@@ -97,4 +98,37 @@ class SIMDFlags final {
 #define HAS_AVX512  HAS_SIMD(SIMD_AVX512)
 // clang-format on
 
+/**
+ * Invoke checkCPUFeature() before Paddle initialization to
+ * check target machine whether support compiled instructions.
+ * If not, simply throw out an error.
+ */
+inline Error __must_check checkCPUFeature() {
+  Error err;
+#ifndef __AVX__
+  if (HAS_AVX) {
+    LOG(WARNING) << "PaddlePaddle wasn't compiled to use avx instructions, "
+                 << "but these are available on your machine and could "
+                 << "speed up CPU computations via CMAKE .. -DWITH_AVX=ON";
+  }
+#else
+  if (!HAS_AVX) {
+    err = Error(
+        "PaddlePaddle was compiled to use avx instructions, "
+        "but these aren't available on your machine, please "
+        "disable it via CMAKE .. -DWITH_AVX=OFF");
+  }
+#endif  // __AVX__
+#ifdef __SSE3__
+  if (!HAS_SSE3) {
+    err = Error(
+        "PaddlePaddle was compiled to use sse3 instructions, "
+        "which is the minimum requirement of PaddlePaddle. "
+        "But these aren't available on your current machine.");
+  }
+#endif  // __SSE3__
+
+  return err;
+}
+
 }  // namespace paddle

paddle/utils/Util.cpp

@@ -26,6 +26,7 @@ limitations under the License. */
 
 #include <gflags/gflags.h>
 
+#include "CpuId.h"
 #include "CustomStackTrace.h"
 #include "Logging.h"
 #include "StringUtil.h"
@@ -185,6 +186,7 @@ void initMain(int argc, char** argv) {
   }
 
   version::printVersion();
+  checkCPUFeature().check();
   runInitFunctions();
 }