Fix diff_type in expand_oacc_for char iter_type

2017-08-07  Tom de Vries  <tom@codesourcery.com>

	PR middle-end/78266
	* omp-expand.c (expand_oacc_for): Ensure diff_type is large enough.

	* testsuite/libgomp.oacc-c-c++-common/vprop-2.c: New test.
	* testsuite/libgomp.oacc-c-c++-common/vprop.c: Remove xfail.

From-SVN: r250925

gcc/ChangeLog

+2017-08-07  Tom de Vries  <tom@codesourcery.com>
+
+	PR middle-end/78266
+	* omp-expand.c (expand_oacc_for): Ensure diff_type is large enough.
+
 2017-08-07  Martin Liska  <mliska@suse.cz>
 
 	* config/mips/mips.c: Include attribs.h.

gcc/omp-expand.c

@@ -5328,6 +5328,8 @@ expand_oacc_for (struct omp_region *region, struct omp_for_data *fd)
     }
   if (POINTER_TYPE_P (diff_type) || TYPE_UNSIGNED (diff_type))
     diff_type = signed_type_for (diff_type);
+  if (TYPE_PRECISION (diff_type) < TYPE_PRECISION (integer_type_node))
+    diff_type = integer_type_node;
 
   basic_block entry_bb = region->entry; /* BB ending in OMP_FOR */
   basic_block exit_bb = region->exit; /* BB ending in OMP_RETURN */

libgomp/ChangeLog

+2017-08-07  Tom de Vries  <tom@codesourcery.com>
+
+	PR middle-end/78266
+	* testsuite/libgomp.oacc-c-c++-common/vprop-2.c: New test.
+	* testsuite/libgomp.oacc-c-c++-common/vprop.c: Remove xfail.
+
 2017-07-27  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/45784

libgomp/testsuite/libgomp.oacc-c-c++-common/vprop-2.c

+/* { dg-do run } */
+
+#include <assert.h>
+
+#define DO_PRAGMA(x) _Pragma (#x)
+
+#define test(idx,type,ngangs)                           \
+  void                                                  \
+  test_##idx ()                                         \
+  {                                                     \
+    int b[100];                                         \
+                                                        \
+    for (unsigned int i = 0; i < 100; i++)              \
+      b[i] = 0;                                         \
+                                                        \
+    DO_PRAGMA(acc parallel num_gangs (ngangs) copy (b)) \
+      {                                                 \
+        _Pragma("acc loop gang")                        \
+          for (type j = 0; j < 5; j++)                  \
+            {                                           \
+              _Pragma("acc loop vector")                \
+                for (unsigned int i = 0; i < 20; i++)   \
+                  b[j * 20 + i] = -2;                   \
+            }                                           \
+      }                                                 \
+                                                        \
+    for (unsigned int i = 0; i < 100; i++)              \
+      assert (b[i] == -2);                              \
+  }
+
+test (0, signed char, 256)
+test (1, unsigned char, 256)
+test (2, signed short, 65535)
+test (3, unsigned short, 65535)
+
+int
+main ()
+{
+  test_0 ();
+  test_1 ();
+  test_2 ();
+  test_3 ();
+
+  return 0;
+}

libgomp/testsuite/libgomp.oacc-c-c++-common/vprop.c

 /* { dg-do run } */
-/* { dg-xfail-run-if "PR78266" { openacc_nvidia_accel_selected } } */
 
 #include <assert.h>