Remove variables only used with .DEFERRED_INIT

In PR109087 it was noticed that we rely on DSE to remove .DEFERRED_INIT
when it is the only remaining use of a variable.  Since DSE is imperfect
and even if it were not would be limited by the amount of statements to
walk the following enhances the unused var removal pass to handle
.DEFERRED_INIT like CLOBBERs, thus we do not keep local variables just
because they are deferred initialized.

	* tree-ssa-live.cc (remove_unused_locals): Do not treat
	the .DEFERRED_INIT of a variable as use, instead remove
	that if it is the only use.

	* gcc.dg/auto-init-unused-1.c: New testcase.

2 files changed, 36 insertions, 1 deletions

diff --git a/gcc/testsuite/gcc.dg/auto-init-unused-1.c b/gcc/testsuite/gcc.dg/auto-init-unused-1.c
new file mode 100644
index 0000000..b7d44e6
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/auto-init-unused-1.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O -ftrivial-auto-var-init=zero -fdump-tree-ssa" } */
+
+int a;
+int foo (void);
+int bar (void);
+
+void
+baz (void)
+{
+  int *b[6];
+  if (foo ())
+    a |= bar ();
+}
+
+/* { dg-final { scan-tree-dump-not "DEFERRED_INIT" "ssa" } } */
diff --git a/gcc/tree-ssa-live.cc b/gcc/tree-ssa-live.cc
index c179444..9118e82 100644
--- a/gcc/tree-ssa-live.cc
+++ b/gcc/tree-ssa-live.cc
@@ -813,6 +813,12 @@ remove_unused_locals (void)
 	      continue;
 	    }
 
+	  if (gimple_call_internal_p (stmt, IFN_DEFERRED_INIT))
+	    {
+	      have_local_clobbers = true;
+	      continue;
+	    }
+
 	  if (b)
 	    TREE_USED (b) = true;
 
@@ -856,7 +862,7 @@ remove_unused_locals (void)
      to remove them if they are the only references to a local variable,
      but we want to retain them when there's any other.  So the first pass
      ignores them, and the second pass (if there were any) tries to remove
-     them.  */
+     them.  We do the same for .DEFERRED_INIT.  */
   if (have_local_clobbers)
     FOR_EACH_BB_FN (bb, cfun)
       {
@@ -888,6 +894,19 @@ remove_unused_locals (void)
 		if (b)
 		  TREE_USED (b) = true;
 	      }
+	    else if (gimple_call_internal_p (stmt, IFN_DEFERRED_INIT))
+	      {
+		tree lhs = gimple_call_lhs (stmt);
+		if (DECL_P (lhs) && !is_used_p (lhs))
+		  {
+		    unlink_stmt_vdef (stmt);
+		    gsi_remove (&gsi, true);
+		    release_defs (stmt);
+		    continue;
+		  }
+		if (b)
+		  TREE_USED (b) = true;
+	      }
 	    else if (gimple_debug_bind_p (stmt))
 	      {
 		tree var = gimple_debug_bind_get_var (stmt);