[patch tree-optimization]: Add cleanup code for possible unused statements in binary optimization

[Kai Tietz]

Hello,

this patch adds some statement-cleanup to forward-propagation.

ChangeLog

2011-08-02  Kai Tietz  <kti...@redhat.com>

        * tree-ssa-forwprop.c (simplify_bitwise_binary):
        Remove possible unused statement after optimization.

2011-08-02  Kai Tietz  <kti...@redhat.com>

        * gcc.dg/tree-ssa/forwprop-9.c: Add test for no int casts.

Bootstrapped and regression-tested for all languages (including Ada
and Obj-C++) on host x86_64-pc-linux-gnu.
Ok for apply?

Regards,
Kai

Index: gcc/gcc/tree-ssa-forwprop.c
===================================================================
--- gcc.orig/gcc/tree-ssa-forwprop.c
+++ gcc/gcc/tree-ssa-forwprop.c
@@ -1810,6 +1810,8 @@ simplify_bitwise_binary (gimple_stmt_ite
       gimple_assign_set_rhs_with_ops_1 (gsi, NOP_EXPR,
                                        tem, NULL_TREE, NULL_TREE);
       update_stmt (gsi_stmt (*gsi));
+      if (TREE_CODE (arg1) == SSA_NAME)
+       remove_prop_source_from_use (arg1);
       return true;
     }

@@ -1840,6 +1842,10 @@ simplify_bitwise_binary (gimple_stmt_ite
       gimple_assign_set_rhs_with_ops_1 (gsi, NOP_EXPR,
                                        tem, NULL_TREE, NULL_TREE);
       update_stmt (gsi_stmt (*gsi));
+      if (TREE_CODE (arg1) == SSA_NAME)
+       remove_prop_source_from_use (arg1);
+      if (TREE_CODE (arg2) == SSA_NAME)
+       remove_prop_source_from_use (arg2);
       return true;
     }

@@ -1887,6 +1893,8 @@ simplify_bitwise_binary (gimple_stmt_ite
       gimple_assign_set_rhs1 (stmt, def1_arg1);
       gimple_assign_set_rhs2 (stmt, cst);
       update_stmt (stmt);
+      if (TREE_CODE (arg1) == SSA_NAME)
+       remove_prop_source_from_use (arg1);
       return true;
     }

@@ -1907,6 +1915,10 @@ simplify_bitwise_binary (gimple_stmt_ite
     {
       gimple_assign_set_rhs_from_tree (gsi, res);
       update_stmt (gsi_stmt (*gsi));
+      if (TREE_CODE (arg1) == SSA_NAME)
+       remove_prop_source_from_use (arg1);
+      if (TREE_CODE (arg2) == SSA_NAME)
+       remove_prop_source_from_use (arg2);
       return true;
     }

Index: gcc/gcc/testsuite/gcc.dg/tree-ssa/forwprop-9.c
===================================================================
--- gcc.orig/gcc/testsuite/gcc.dg/tree-ssa/forwprop-9.c
+++ gcc/gcc/testsuite/gcc.dg/tree-ssa/forwprop-9.c
@@ -11,4 +11,5 @@ foo (_Bool a, _Bool b, _Bool c

 /* { dg-final { scan-tree-dump-times " == " 0 "forwprop1" } } */
 /* { dg-final { scan-tree-dump-times " != " 0 "forwprop1" } } */
+/* { dg-final { scan-tree-dump-times "\\\(int\\\)" 0 "forwprop1" } } */
 /* { dg-final { cleanup-tree-dump "forwprop1" } } */