Compile time conditions of enabling prefetch instruction now includes defined(COMPILER_GCC3).

tensorflower-gardener · tensorflower-gardener · commit 18218f04e2e2 · 2017-02-22T09:53:35.000-08:00
Change: 148228903
diff --git a/tensorflow/core/platform/prefetch.h b/tensorflow/core/platform/prefetch.h
@@ -44,7 +44,9 @@ void prefetch(const void* x);
 // ---------------------------------------------------------------------------
 template <PrefetchHint hint>
 inline void prefetch(const void* x) {
-#if defined(__llvm__) || defined(COMPILER_GCC)
+// Check of COMPILER_GCC macro below is kept only for backward-compatibility
+// reasons. COMPILER_GCC3 is the macro that actually enables prefetch.
+#if defined(__llvm__) || defined(COMPILER_GCC) || defined(COMPILER_GCC3)
   __builtin_prefetch(x, 0, hint);
 #else
 // You get no effect.  Feel free to add more sections above.
