[backport proposed and approved but not yet applied patch for PR57980,
 depends on build_minus_one_cst backport <mikpe@it.uu.se>]

List-Archive: <http://gcc.gnu.org/ml/gcc-patches/>
Date: Fri, 9 Aug 2013 16:35:18 +0200
From: Marek Polacek <polacek at redhat dot com>
Subject: [PATCH] Fix PR57980

In this PR the problem was that when dealing with the gimple assign in
the tailcall optimization, we, when the rhs operand is of a vector
type, need to create -1 also of a vector type, but build_int_cst
doesn't create vectors (ICEs).  Instead, we should use build_minus_one_cst
because that can create even the VECTOR_TYPE constant (and, it can
create even REAL_TYPE/COMPLEX_TYPE), as suggested by Marc.

Regtested/bootstrapped on x86_64-linux, ok for trunk and 4.8?

2013-08-09  Marek Polacek  <polacek@redhat.com>
	    Marc Glisse  <marc.glisse@inria.fr>

	PR tree-optimization/57980
	* tree-tailcall.c (process_assignment): Call build_minus_one_cst
	when creating -1 constant.

	* gcc.dg/pr57980.c: New test.

--- gcc-4.7.3/gcc/testsuite/gcc.dg/pr57980.c.~1~	1970-01-01 01:00:00.000000000 +0100
+++ gcc-4.7.3/gcc/testsuite/gcc.dg/pr57980.c	2013-08-10 12:42:04.410899371 +0200
@@ -0,0 +1,19 @@
+/* PR tree-optimization/57980 */
+/* { dg-do compile } */
+/* { dg-options "-O -foptimize-sibling-calls" } */
+
+typedef int V __attribute__ ((vector_size (sizeof (int))));
+extern V f (void);
+
+V
+bar (void)
+{
+  return -f ();
+}
+
+V
+foo (void)
+{
+  V v = { };
+  return v - f ();
+}
--- gcc-4.7.3/gcc/tree-tailcall.c.~1~	2013-04-03 10:22:12.000000000 +0200
+++ gcc-4.7.3/gcc/tree-tailcall.c	2013-08-10 12:42:04.410899371 +0200
@@ -327,11 +327,7 @@ process_assignment (gimple stmt, gimple_
       return true;
 
     case NEGATE_EXPR:
-      if (FLOAT_TYPE_P (TREE_TYPE (op0)))
-        *m = build_real (TREE_TYPE (op0), dconstm1);
-      else
-        *m = build_int_cst (TREE_TYPE (op0), -1);
-
+      *m = build_minus_one_cst (TREE_TYPE (op0));
       *ass_var = dest;
       return true;
 
@@ -340,11 +336,7 @@ process_assignment (gimple stmt, gimple_
         *a = fold_build1 (NEGATE_EXPR, TREE_TYPE (non_ass_var), non_ass_var);
       else
         {
-          if (FLOAT_TYPE_P (TREE_TYPE (non_ass_var)))
-            *m = build_real (TREE_TYPE (non_ass_var), dconstm1);
-          else
-            *m = build_int_cst (TREE_TYPE (non_ass_var), -1);
-
+	  *m = build_minus_one_cst (TREE_TYPE (non_ass_var));
           *a = fold_build1 (NEGATE_EXPR, TREE_TYPE (non_ass_var), non_ass_var);
         }