re PR middle-end/85817 (ICE in expand_call at gcc/calls.c:4291)

2018-05-18  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	PR middle-end/85817
	* ipa-pure-const.c (malloc_candidate_p): Remove the check integer_zerop
	for retval and return false if all args to phi are zero.	

testsuite/
	* gcc.dg/tree-ssa/pr83648.c: Change scan-tree-dump to
	scan-tree-dump-not for h.

From-SVN: r260358

gcc/ChangeLog

+2018-05-18  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+	PR middle-end/85817
+	* ipa-pure-const.c (malloc_candidate_p): Remove the check integer_zerop
+	for retval and return false if all args to phi are zero.	
+
 2018-05-18  Richard Biener  <rguenther@suse.de>
 
 	* gimple-ssa-evrp.c (class evrp_folder): Add simplify_stmt_using_ranges

gcc/ipa-pure-const.c

@@ -940,9 +940,6 @@ malloc_candidate_p (function *fun, bool ipa)
       if (!retval)
 	DUMP_AND_RETURN("No return value.")
 
-      if (integer_zerop (retval))
-	continue;
-
       if (TREE_CODE (retval) != SSA_NAME
 	  || TREE_CODE (TREE_TYPE (retval)) != POINTER_TYPE)
 	DUMP_AND_RETURN("Return value is not SSA_NAME or not a pointer type.")
@@ -972,37 +969,44 @@ malloc_candidate_p (function *fun, bool ipa)
 	}
 
       else if (gphi *phi = dyn_cast<gphi *> (def))
-	for (unsigned i = 0; i < gimple_phi_num_args (phi); ++i)
-	  {
-	    tree arg = gimple_phi_arg_def (phi, i);
-	    if (integer_zerop (arg))
-	      continue;
+	{
+	  bool all_args_zero = true;
+	  for (unsigned i = 0; i < gimple_phi_num_args (phi); ++i)
+	    {
+	      tree arg = gimple_phi_arg_def (phi, i);
+	      if (integer_zerop (arg))
+		continue;
+
+	      all_args_zero = false;
+	      if (TREE_CODE (arg) != SSA_NAME)
+		DUMP_AND_RETURN ("phi arg is not SSA_NAME.");
+	      if (!check_retval_uses (arg, phi))
+		DUMP_AND_RETURN ("phi arg has uses outside phi"
+				 " and comparisons against 0.")
+
+	      gimple *arg_def = SSA_NAME_DEF_STMT (arg);
+	      gcall *call_stmt = dyn_cast<gcall *> (arg_def);
+	      if (!call_stmt)
+		return false;
+	      tree callee_decl = gimple_call_fndecl (call_stmt);
+	      if (!callee_decl)
+		return false;
+	      if (!ipa && !DECL_IS_MALLOC (callee_decl))
+		DUMP_AND_RETURN("callee_decl does not have malloc attribute"
+				" for non-ipa mode.")
+
+	      cgraph_edge *cs = node->get_edge (call_stmt);
+	      if (cs)
+		{
+		  ipa_call_summary *es = ipa_call_summaries->get (cs);
+		  gcc_assert (es);
+		  es->is_return_callee_uncaptured = true;
+		}
+	    }
 
-	    if (TREE_CODE (arg) != SSA_NAME)
-	      DUMP_AND_RETURN ("phi arg is not SSA_NAME.");
-	    if (!check_retval_uses (arg, phi))
-	      DUMP_AND_RETURN ("phi arg has uses outside phi"
-			       " and comparisons against 0.")
-
-	    gimple *arg_def = SSA_NAME_DEF_STMT (arg);
-	    gcall *call_stmt = dyn_cast<gcall *> (arg_def);
-	    if (!call_stmt)
-	      return false;
-	    tree callee_decl = gimple_call_fndecl (call_stmt);
-	    if (!callee_decl)
-	      return false;
-	    if (!ipa && !DECL_IS_MALLOC (callee_decl))
-	      DUMP_AND_RETURN("callee_decl does not have malloc attribute for"
-			      " non-ipa mode.")
-
-	    cgraph_edge *cs = node->get_edge (call_stmt);
-	    if (cs)
-	      {
-		ipa_call_summary *es = ipa_call_summaries->get (cs);
-		gcc_assert (es);
-		es->is_return_callee_uncaptured = true;
-	      }
-	  }
+	  if (all_args_zero)
+	    DUMP_AND_RETURN ("Return value is a phi with all args equal to 0.");
+	}
 
       else
 	DUMP_AND_RETURN("def_stmt of return value is not a call or phi-stmt.")

gcc/testsuite/ChangeLog

+2018-05-18  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+	PR middle-end/85817
+	* gcc.dg/tree-ssa/pr83648.c: Change scan-tree-dump to
+	scan-tree-dump-not for h.
+
 2018-05-18  Richard Biener  <rguenther@suse.de>
 
 	* gcc.dg/tree-ssa/pr21559.c: Adjust.

gcc/testsuite/gcc.dg/tree-ssa/pr83648.c

@@ -12,4 +12,4 @@ void *h()
 }
 
 /* { dg-final { scan-tree-dump "Function found to be malloc: g" "local-pure-const1" } } */
-/* { dg-final { scan-tree-dump "Function found to be malloc: h" "local-pure-const1" } } */
+/* { dg-final { scan-tree-dump-not "Function found to be malloc: h" "local-pure-const1" } } */