Test for __builtin_prefetch.

From-SVN: r47584

gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-1.c

+/* Test that __builtin_prefetch does no harm.
+
+   Prefetch using all valid combinations of rw and locality values.
+   These must be compile-time constants.  */
+
+#define NO_TEMPORAL_LOCALITY 0
+#define LOW_TEMPORAL_LOCALITY 1
+#define MODERATE_TEMPORAL_LOCALITY 1
+#define HIGH_TEMPORAL_LOCALITY 3
+
+#define WRITE_ACCESS 1
+#define READ_ACCESS 0
+
+enum locality { none, low, moderate, high };
+enum rw { read, write };
+
+int arr[10];
+
+void
+good_const (int *p)
+{
+  __builtin_prefetch (p, 0, 0);
+  __builtin_prefetch (p, 0, 1);
+  __builtin_prefetch (p, 0, 2);
+  __builtin_prefetch (p, READ_ACCESS, 3);
+  __builtin_prefetch (p, 1, NO_TEMPORAL_LOCALITY);
+  __builtin_prefetch (p, 1, LOW_TEMPORAL_LOCALITY);
+  __builtin_prefetch (p, 1, MODERATE_TEMPORAL_LOCALITY);
+  __builtin_prefetch (p, WRITE_ACCESS, HIGH_TEMPORAL_LOCALITY);
+}
+
+void
+good_enum (int *p)
+{
+    __builtin_prefetch (p, read, none);
+    __builtin_prefetch (p, read, low);
+    __builtin_prefetch (p, read, moderate);
+    __builtin_prefetch (p, read, high);
+    __builtin_prefetch (p, write, none);
+    __builtin_prefetch (p, write, low);
+    __builtin_prefetch (p, write, moderate);
+    __builtin_prefetch (p, write, high);
+}
+
+void
+good_expr (int *p)
+{
+  __builtin_prefetch (p, 1 - 1, 6 - (2 * 3));
+  __builtin_prefetch (p, 1 + 0, 1 + 2);
+}
+
+int
+main ()
+{
+  good_const (arr);
+  good_enum (arr);
+  good_expr (arr);
+  exit (0);
+}