re PR target/7044 (vax casesi breakage)

	PR target/7044
	* config/aarch64/aarch64.c
	(aarch64_override_options_after_change_1): When forcing
	flag_omit_frame_pointer to be true, use a special value that can
	be detected if this function is called again, thus preventing
	flag_omit_leaf_frame_pointer from being forced to be false.

	* gcc.target/aarch64/pr70044.c: New test.

From-SVN: r234118

gcc/ChangeLog

+2016-03-10  Nick Clifton  <nickc@redhat.com>
+
+	PR target/7044
+	* config/aarch64/aarch64.c
+	(aarch64_override_options_after_change_1): When forcing
+	flag_omit_frame_pointer to be true, use a special value that can
+	be detected if this function is called again, thus preventing
+	flag_omit_leaf_frame_pointer from being forced to be false.
+
 2016-03-10  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* common/config/aarch64/aarch64-common.c (aarch64_handle_option):

gcc/config/aarch64/aarch64.c

@@ -8110,10 +8110,25 @@ aarch64_parse_override_string (const char* input_string,
 static void
 aarch64_override_options_after_change_1 (struct gcc_options *opts)
 {
+  /* The logic here is that if we are disabling all frame pointer generation
+     then we do not need to disable leaf frame pointer generation as a
+     separate operation.  But if we are *only* disabling leaf frame pointer
+     generation then we set flag_omit_frame_pointer to true, but in
+     aarch64_frame_pointer_required we return false only for leaf functions.
+
+     PR 70044: We have to be careful about being called multiple times for the
+     same function.  Once we have decided to set flag_omit_frame_pointer just
+     so that we can omit leaf frame pointers, we must then not interpret a
+     second call as meaning that all frame pointer generation should be
+     omitted.  We do this by setting flag_omit_frame_pointer to a special,
+     non-zero value.  */
+  if (opts->x_flag_omit_frame_pointer == 2)
+    opts->x_flag_omit_frame_pointer = 0;
+
   if (opts->x_flag_omit_frame_pointer)
     opts->x_flag_omit_leaf_frame_pointer = false;
   else if (opts->x_flag_omit_leaf_frame_pointer)
-    opts->x_flag_omit_frame_pointer = true;
+    opts->x_flag_omit_frame_pointer = 2;
 
   /* If not optimizing for size, set the default
      alignment to what the target wants.  */

gcc/testsuite/ChangeLog

+2016-03-10  Nick Clifton  <nickc@redhat.com>
+
+	PR target/70044
+	* gcc.target/aarch64/pr70044.c: New test.
+
 2016-03-10  Patrick Palka  <ppalka@gcc.gnu.org>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/testsuite/gcc.target/aarch64/pr70044.c

+/* { dg-do link } */
+/* { dg-require-effective-target lto } */
+/* { dg-options "-flto -O --save-temps -fno-omit-frame-pointer" } */
+
+extern int atoi (const char *);
+
+int
+main (int argc, char **argv)
+{
+  return atoi (argv[0]) + 1;
+}
+
+/* Check that the frame pointer really is created.  */
+/* { dg-final { scan-lto-assembler "add	x29, sp," } } */