re PR rtl-optimization/49982 (ICE in fixup_args_size_notes, at expr.c:3625)

PR rtl-opt/49982
        * expr.c (fixup_args_size_notes): Look through no-op moves.

Co-Authored-By: Richard Henderson <rth@redhat.com>

From-SVN: r177464

gcc/ChangeLog

+2011-08-05  Kaz Kojima  <kkojima@gcc.gnu.org>
+	    Richard Henderson  <rth@redhat.com>
+
+	PR rtl-opt/49982
+	* expr.c (fixup_args_size_notes): Look through no-op moves.
+
 2011-08-05  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.md (*push<mode>2): Use "o" constraint instead

gcc/expr.c

@@ -3631,6 +3631,10 @@ fixup_args_size_notes (rtx prev, rtx last, int end_args_size)
 	      && XEXP (SET_SRC (set), 0) == stack_pointer_rtx
 	      && CONST_INT_P (XEXP (SET_SRC (set), 1)))
 	    this_delta = INTVAL (XEXP (SET_SRC (set), 1));
+	  /* ??? Reload can generate no-op moves, which will be cleaned
+	     up later.  Recognize it and continue searching.  */
+	  else if (rtx_equal_p (dest, SET_SRC (set)))
+	    this_delta = 0;
 	  else
 	    saw_unknown = true;
 	}