re PR middle-end/17906 (ICE in verify_ssa: PHI argument is not SSA_NAME, or invariant)

	PR tree-optimization/17906
	* tree-tailcall.c (tree_optimize_tail_calls_1): Do not attempt to
	copy non-gimple reg arguments.

From-SVN: r88828

gcc/ChangeLog

+2004-10-09  Zdenek Dvorak  <dvorakz@suse.cz>
+
+	PR tree-optimization/17906
+	* tree-tailcall.c (tree_optimize_tail_calls_1): Do not attempt to
+	copy non-gimple reg arguments.
+
 2004-10-09  Roger Sayle  <roger@eyesopen.com>
 
 	PR rtl-optimization/17853

gcc/testsuite/ChangeLog

+2004-10-09  Zdenek Dvorak  <dvorakz@suse.cz>
+
+	PR tree-optimization/17906
+	* gcc.c-torture/compile/pr17906.c: New.
+
 2004-10-09  Stuart Hastings  <stuart@apple.com>
 	    Roger Sayle  <roger@eyesopen.com>
 

gcc/testsuite/gcc.c-torture/compile/pr17906.c

+struct usc_bigstack_t {};
+
+void
+usc_recressive_func(int cnt, int max, struct usc_bigstack_t bstack)
+{
+  usc_recressive_func(cnt+1, max, bstack);
+}

gcc/tree-tailcall.c

@@ -870,7 +870,8 @@ tree_optimize_tail_calls_1 (bool opt_tailcalls)
 	  for (param = DECL_ARGUMENTS (current_function_decl);
 	       param;
 	       param = TREE_CHAIN (param))
-	    if (var_ann (param)
+	    if (is_gimple_reg (param)
+		&& var_ann (param)
 		/* Also parameters that are only defined but never used need not
 		   be copied.  */
 		&& (var_ann (param)->default_def