re PR tree-optimization/52019 (tree-ssa/ipa-split-5.c fails with -fno-tree-sra because of CLOBBERS)

	PR tree-optimization/52019
	* ipa-split.c (find_return_bb, find_retval, visit_bb): Ignore
	CLOBBER stmts.

	* gcc.dg/tree-ssa/ipa-split-6.c: New test.

From-SVN: r184508

gcc/ChangeLog

+2012-02-23  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/52019
+	* ipa-split.c (find_return_bb, find_retval, visit_bb): Ignore
+	CLOBBER stmts.
+
 2012-02-23  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
 
 	* acinclude.m4: Use HAVE_INITFINI_ARRAY_SUPPORT instead of

gcc/ipa-split.c

 /* Function splitting pass
-   Copyright (C) 2010, 2011
+   Copyright (C) 2010, 2011, 2012
    Free Software Foundation, Inc.
    Contributed by Jan Hubicka  <jh@suse.cz>
 
@@ -624,7 +624,9 @@ find_return_bb (void)
   for (bsi = gsi_last_bb (e->src); !gsi_end_p (bsi); gsi_prev (&bsi))
     {
       gimple stmt = gsi_stmt (bsi);
-      if (gimple_code (stmt) == GIMPLE_LABEL || is_gimple_debug (stmt))
+      if (gimple_code (stmt) == GIMPLE_LABEL
+	  || is_gimple_debug (stmt)
+	  || gimple_clobber_p (stmt))
 	;
       else if (gimple_code (stmt) == GIMPLE_ASSIGN
 	       && found_return
@@ -657,7 +659,8 @@ find_retval (basic_block return_bb)
   for (bsi = gsi_start_bb (return_bb); !gsi_end_p (bsi); gsi_next (&bsi))
     if (gimple_code (gsi_stmt (bsi)) == GIMPLE_RETURN)
       return gimple_return_retval (gsi_stmt (bsi));
-    else if (gimple_code (gsi_stmt (bsi)) == GIMPLE_ASSIGN)
+    else if (gimple_code (gsi_stmt (bsi)) == GIMPLE_ASSIGN
+	     && !gimple_clobber_p (gsi_stmt (bsi)))
       return gimple_assign_rhs1 (gsi_stmt (bsi));
   return NULL;
 }
@@ -733,6 +736,9 @@ visit_bb (basic_block bb, basic_block return_bb,
       if (is_gimple_debug (stmt))
 	continue;
 
+      if (gimple_clobber_p (stmt))
+	continue;
+
       /* FIXME: We can split regions containing EH.  We can not however
 	 split RESX, EH_DISPATCH and EH_POINTER referring to same region
 	 into different partitions.  This would require tracking of

gcc/testsuite/ChangeLog

+2012-02-23  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/52019
+	* gcc.dg/tree-ssa/ipa-split-6.c: New test.
+
 2012-02-22  Kai Tietz  <ktietz@redhat.com>
 
 	* g++.dg/opt/devirt2.C: Add rule for *-*-mingw* target.

gcc/testsuite/gcc.dg/tree-ssa/ipa-split-6.c

+/* PR tree-optimization/52019 */
+/* { dg-do compile } */
+/* { dg-options "-O3 -fno-tree-sra -fdump-tree-fnsplit -fdump-tree-optimized" } */
+
+#include "ipa-split-5.c"
+
+/* { dg-final { scan-tree-dump-times "Splitting function" 1 "fnsplit"} } */
+/* { dg-final { cleanup-tree-dump "fnsplit" } } */
+/* { dg-final { scan-tree-dump "part" "optimized"} } */
+/* { dg-final { cleanup-tree-dump "optimized" } } */