re PR target/48344 (powerpc ICE with -fstack-limit-register=r2)

[gcc]

2016-02-16  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	PR Target/48344
	* opts-global.c (handle_common_deferred_options): Introduce and
	initialize two global variables to remember command-line options
	specifying a stack-limiting register.
	* opts.h: Add extern declarations of the two new global variables. 
	* emit-rtl.c (init_emit_once): Initialize the stack_limit_rtx
	variable based on the values of the two new global variables.

[gcc/testsuite]

2016-02-16  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	PR Target/48344
	* gcc.target/powerpc/pr48344-1.c: New test.

From-SVN: r233477

gcc/ChangeLog

+2016-02-16  Kelvin Nilsen  <kelvin@gcc.gnu.org>
+
+	PR Target/48344
+	* opts-global.c (handle_common_deferred_options): Introduce and
+	initialize two global variables to remember command-line options
+	specifying a stack-limiting register.
+	* opts.h: Add extern declarations of the two new global variables. 
+	* emit-rtl.c (init_emit_once): Initialize the stack_limit_rtx
+	variable based on the values of the two new global variables.
+
 2016-02-16  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/69835

gcc/emit-rtl.c

@@ -57,6 +57,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "builtins.h"
 #include "rtl-iter.h"
 #include "stor-layout.h"
+#include "opts.h"
 
 struct target_rtl default_target_rtl;
 #if SWITCHABLE_TARGET
@@ -5895,6 +5896,13 @@ init_emit_once (void)
 
   /* Create the unique rtx's for certain rtx codes and operand values.  */
 
+  /* Process stack-limiting command-line options.  */
+  if (opt_fstack_limit_symbol_arg != NULL)
+    stack_limit_rtx 
+      = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (opt_fstack_limit_symbol_arg));
+  if (opt_fstack_limit_register_no >= 0)
+    stack_limit_rtx = gen_rtx_REG (Pmode, opt_fstack_limit_register_no);
+
   /* Don't use gen_rtx_CONST_INT here since gen_rtx_CONST_INT in this case
      tries to use these variables.  */
   for (i = - MAX_SAVED_CONST_INT; i <= MAX_SAVED_CONST_INT; i++)

gcc/opts-global.c

@@ -310,6 +310,10 @@ decode_options (struct gcc_options *opts, struct gcc_options *opts_set,
   finish_options (opts, opts_set, loc);
 }
 
+/* Hold command-line options associated with stack limitation.  */
+const char *opt_fstack_limit_symbol_arg = NULL;
+int opt_fstack_limit_register_no = -1;
+
 /* Process common options that have been deferred until after the
    handlers have been called for all options.  */
 
@@ -417,12 +421,18 @@ handle_common_deferred_options (void)
 	    if (reg < 0)
 	      error ("unrecognized register name %qs", opt->arg);
 	    else
-	      stack_limit_rtx = gen_rtx_REG (Pmode, reg);
+	      {
+		/* Deactivate previous OPT_fstack_limit_symbol_ options.  */
+		opt_fstack_limit_symbol_arg = NULL;
+		opt_fstack_limit_register_no = reg;
+	      }
 	  }
 	  break;
 
 	case OPT_fstack_limit_symbol_:
-	  stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (opt->arg));
+	  /* Deactivate previous OPT_fstack_limit_register_ options.  */
+	  opt_fstack_limit_register_no = -1;
+	  opt_fstack_limit_symbol_arg = opt->arg;
 	  break;
 
 	case OPT_fasan_shadow_offset_:

gcc/opts.h

@@ -296,6 +296,10 @@ struct cl_option_handlers
   struct cl_option_handler_func handlers[3];
 };
 
+/* Hold command-line options associated with stack limitation.  */
+extern const char *opt_fstack_limit_symbol_arg;
+extern int opt_fstack_limit_register_no;
+
 /* Input file names.  */
 
 extern const char **in_fnames;

gcc/testsuite/ChangeLog

+2016-02-16  Kelvin Nilsen  <kelvin@gcc.gnu.org>
+
+	PR Target/48344
+	* gcc.target/powerpc/pr48344-1.c: New test.
+
 2015-02-16  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/69742

gcc/testsuite/gcc.target/powerpc/pr48344-1.c

+/* { dg-do compile } */
+/* { dg-options "-fstack-limit-register=r2" } */
+void foo ()
+{
+  int N = 2;
+  int slots[N];
+
+}