re PR middle-end/41930 (cc1 SEGV compiling maxval_r16.c)

	PR middle-end/41930
	* simplify-rtx.c (simplify_replace_fn_rtx) <case 'e'>: Skip
	processing if XEXP (x, i) is NULL.

From-SVN: r154116

gcc/ChangeLog

+2009-11-12 Uros Bizjak <ubizjak@gmail.com>
+
+	PR middle-end/41930
+	* simplify-rtx.c (simplify_replace_fn_rtx) <case 'e'>: Skip
+	processing if XEXP (x, i) is NULL.
+
 2009-11-12  Jan Hubicka  <jh@suse.cz>
 
 	* ipa.c (function_and_variable_visibility): Verify that WEAK || COMMON
@@ -43,17 +49,15 @@
 
 2009-11-11  Kai Tietz  <kai.tietz@onevision.com>
 
-	* config/i386/cygming.h (HANDLE_PRAGMA_PUSH_POP_MACRO):
-	Removed.
+	* config/i386/cygming.h (HANDLE_PRAGMA_PUSH_POP_MACRO): Removed.
 	* c-pragma.c (def_pragma_macro_value): Likewise.
 	(def_pragma_macro): Likewise.
 	(pushed_macro_table): Likewise.
-	(HANDLE_PRAGMA_PUSH_POP_MACRO): Remove guarded
-	code.
-	* doc/tm.texi (HANDLE_PRAGMA_PUSH_POP_MACRO):
-	Removed.
+	(HANDLE_PRAGMA_PUSH_POP_MACRO): Remove guarded code.
+	* doc/tm.texi (HANDLE_PRAGMA_PUSH_POP_MACRO): Removed.
 
 2009-11-11  Basile Starynkevitch  <basile@starynkevitch.net>
+
 	* doc/plugins.texi (Registering custom attributes): section
 	renamed as (Registering custom attributes or pragmas).
 	Mentions custom attributes & pragmas, and c_register_pragma, with
@@ -677,7 +681,7 @@
 	(xop_pmadcsswd): Ditto.
 	(xop_pmadcswd): Ditto.
 	(xop_pcmov_<mode>): Ditto.
-	(xop_pcmov_<mode>)256: Ditto.
+	(xop_pcmov_<mode>256): Ditto.
 	(xop_phaddbw): Ditto.
 	(xop_phaddbd): Ditto.
 	(xop_phaddbq): Ditto.
@@ -996,7 +1000,7 @@
 	* config/frv/frv.c (frv_function_value, frv_libcall_value,
 	frv_function_value_regno_p): New functions.
 	(TARGET_FUNCTION_VALUE, TARGET_LIBCALL_VALUE): Declare.
-	* config/frv/frv.h: (FUNCTION_VALUE, LIBCALL_VALUE): Remove.
+	* config/frv/frv.h (FUNCTION_VALUE, LIBCALL_VALUE): Remove.
 	(FUNCTION_VALUE_REGNO_P): Redefine, use frv_function_value_regno_p.
 	* config/frv/frv-protos.h (frv_function_value_regno_p): Declare.
 
@@ -1006,7 +1010,7 @@
 	new 'outgoing' argument.
 	(mn10300_libcall_value, mn10300_function_value_regno_p): New functions.
 	(TARGET_FUNCTION_VALUE, TARGET_LIBCALL_VALUE): Declare.
-	* config/mn10300/mn10300.h: (FUNCTION_VALUE, FUNCTION_OUTGOING_VALUE,
+	* config/mn10300/mn10300.h (FUNCTION_VALUE, FUNCTION_OUTGOING_VALUE,
 	LIBCALL_VALUE): Remove.
 	(FUNCTION_VALUE_REGNO_P): Redefine, use mn10300_function_value_regno_p.
 	* config/mn10300/mn10300-protos.h (mn10300_function_value): Remove.

gcc/simplify-rtx.c

@@ -489,6 +489,8 @@ simplify_replace_fn_rtx (rtx x, const_rtx old_rtx,
 	break;
 
       case 'e':
+	if (XEXP (x, i))
+	  {
 	    op = simplify_replace_fn_rtx (XEXP (x, i), old_rtx, fn, data);
 	    if (op != XEXP (x, i))
 	      {
@@ -496,6 +498,7 @@ simplify_replace_fn_rtx (rtx x, const_rtx old_rtx,
 		  newx = shallow_copy_rtx (x);
 		XEXP (newx, i) = op;
 	      }
+	  }
 	break;
       }
   return newx;