i386: Don't use ix86_tune_ctrl_string in parse_mtune_ctrl_str

There are

static void
parse_mtune_ctrl_str (bool dump)
{
  if (!ix86_tune_ctrl_string)
    return;

parse_mtune_ctrl_str is only called from set_ix86_tune_features, which
is only called from ix86_function_specific_restore and
ix86_option_override_internal.  parse_mtune_ctrl_str shouldn't use
ix86_tune_ctrl_string which is defined with global_options.  Instead,
opts should be passed to parse_mtune_ctrl_str.

	PR target/91399
	* config/i386/i386-options.c (set_ix86_tune_features): Add an
	argument of a pointer to struct gcc_options and pass it to
	parse_mtune_ctrl_str.
	(ix86_function_specific_restore): Pass opts to
	set_ix86_tune_features.
	(ix86_option_override_internal): Likewise.
	(parse_mtune_ctrl_str): Add an argument of a pointer to struct
	gcc_options and use it for x_ix86_tune_ctrl_string.

gcc/ChangeLog

+2020-01-28  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/91399
+	* config/i386/i386-options.c (set_ix86_tune_features): Add an
+	argument of a pointer to struct gcc_options and pass it to
+	parse_mtune_ctrl_str.
+	(ix86_function_specific_restore): Pass opts to
+	set_ix86_tune_features.
+	(ix86_option_override_internal): Likewise.
+	(parse_mtune_ctrl_str): Add an argument of a pointer to struct
+	gcc_options and use it for x_ix86_tune_ctrl_string.
+
 2020-01-28  Richard Sandiford  <richard.sandiford@arm.com>
 
 	PR rtl-optimization/87763

gcc/config/i386/i386-options.c

@@ -741,7 +741,8 @@ ix86_option_override_internal (bool main_args_p,
 			       struct gcc_options *opts,
 			       struct gcc_options *opts_set);
 static void
-set_ix86_tune_features (enum processor_type ix86_tune, bool dump);
+set_ix86_tune_features (struct gcc_options *opts,
+			enum processor_type ix86_tune, bool dump);
 
 /* Restore the current options */
 
@@ -810,7 +811,7 @@ ix86_function_specific_restore (struct gcc_options *opts,
 
   /* Recreate the tune optimization tests */
   if (old_tune != ix86_tune)
-    set_ix86_tune_features (ix86_tune, false);
+    set_ix86_tune_features (opts, ix86_tune, false);
 }
 
 /* Adjust target options after streaming them in.  This is mainly about
@@ -1538,13 +1539,13 @@ ix86_parse_stringop_strategy_string (char *strategy_str, bool is_memset)
    print the features that are explicitly set.  */
 
 static void
-parse_mtune_ctrl_str (bool dump)
+parse_mtune_ctrl_str (struct gcc_options *opts, bool dump)
 {
-  if (!ix86_tune_ctrl_string)
+  if (!opts->x_ix86_tune_ctrl_string)
     return;
 
   char *next_feature_string = NULL;
-  char *curr_feature_string = xstrdup (ix86_tune_ctrl_string);
+  char *curr_feature_string = xstrdup (opts->x_ix86_tune_ctrl_string);
   char *orig = curr_feature_string;
   int i;
   do
@@ -1583,7 +1584,8 @@ parse_mtune_ctrl_str (bool dump)
    processor type.  */
 
 static void
-set_ix86_tune_features (enum processor_type ix86_tune, bool dump)
+set_ix86_tune_features (struct gcc_options *opts,
+			enum processor_type ix86_tune, bool dump)
 {
   unsigned HOST_WIDE_INT ix86_tune_mask = HOST_WIDE_INT_1U << ix86_tune;
   int i;
@@ -1605,7 +1607,7 @@ set_ix86_tune_features (enum processor_type ix86_tune, bool dump)
                  ix86_tune_features[i] ? "on" : "off");
     }
 
-  parse_mtune_ctrl_str (dump);
+  parse_mtune_ctrl_str (opts, dump);
 }
 
 
@@ -2364,7 +2366,7 @@ ix86_option_override_internal (bool main_args_p,
       XDELETEVEC (s);
     }
 
-  set_ix86_tune_features (ix86_tune, opts->x_ix86_dump_tunes);
+  set_ix86_tune_features (opts, ix86_tune, opts->x_ix86_dump_tunes);
 
   ix86_recompute_optlev_based_flags (opts, opts_set);