From: dberlin <dberlin@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 14 Apr 2005 15:24:53 +0000 (+0000)
Subject: 2005-04-14  Daniel Berlin  <dberlin@dberlin.org>
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d16ec1f336d23b7c189c4a0ba8f2878d7e352770;p=thirdparty%2Fgcc.git

2005-04-14  Daniel Berlin  <dberlin@dberlin.org>

	Fix PR tree-optimization/20963
	* tree-ssa-pre.c (compute_avail): Remove special case for
	TREE_INVARIANT.
	(create_expression_by_pieces): Add value numbers for forced out
	statements.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@98136 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 476c7cd068a3..054ece3d8ef0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2005-04-14  Daniel Berlin  <dberlin@dberlin.org>
+
+	Fix PR tree-optimization/20963
+	* tree-ssa-pre.c (compute_avail): Remove special case for
+	TREE_INVARIANT. 
+	(create_expression_by_pieces): Add value numbers for forced out
+	statements.
+
 2005-04-14  Hans-Peter Nilsson  <hp@axis.com>
 
 	* config/cris/cris.md: Replace references to (reg:SI 16) with
diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c
index 34b759cb8808..409ce8350445 100644
--- a/gcc/tree-ssa-pre.c
+++ b/gcc/tree-ssa-pre.c
@@ -1341,6 +1341,18 @@ create_expression_by_pieces (basic_block block, tree expr, tree stmts)
 	newexpr = force_gimple_operand (folded, &forced_stmts, false, NULL);
 	if (forced_stmts)
 	  {
+	    tsi = tsi_start (forced_stmts);
+	    for (; !tsi_end_p (tsi); tsi_next (&tsi))
+	      {
+		tree stmt = tsi_stmt (tsi);
+		tree forcedname = TREE_OPERAND (stmt, 0);
+		tree forcedexpr = TREE_OPERAND (stmt, 1);
+		tree val = vn_lookup_or_add (forcedexpr, NULL);
+		vn_add (forcedname, val, NULL);		
+		bitmap_value_replace_in_set (NEW_SETS (block), forcedname); 
+		bitmap_value_replace_in_set (AVAIL_OUT (block), forcedname);
+	      }
+
 	    tsi = tsi_last (stmts);
 	    tsi_link_after (&tsi, forced_stmts, TSI_CONTINUE_LINKING);
 	  }
@@ -1371,6 +1383,17 @@ create_expression_by_pieces (basic_block block, tree expr, tree stmts)
 	newexpr = force_gimple_operand (folded, &forced_stmts, false, NULL);
 	if (forced_stmts)
 	  {
+	    tsi = tsi_start (forced_stmts);
+	    for (; !tsi_end_p (tsi); tsi_next (&tsi))
+	      {
+		tree stmt = tsi_stmt (tsi);
+		tree forcedname = TREE_OPERAND (stmt, 0);
+		tree forcedexpr = TREE_OPERAND (stmt, 1);
+		tree val = vn_lookup_or_add (forcedexpr, NULL);
+		vn_add (forcedname, val, NULL);		
+		bitmap_value_replace_in_set (NEW_SETS (block), forcedname); 
+		bitmap_value_replace_in_set (AVAIL_OUT (block), forcedname);
+	      }
 	    tsi = tsi_last (stmts);
 	    tsi_link_after (&tsi, forced_stmts, TSI_CONTINUE_LINKING);
 	  }
@@ -1960,7 +1983,6 @@ compute_avail (void)
 		}
 	      else if (TREE_CODE (rhs) == SSA_NAME
 		       || is_gimple_min_invariant (rhs)
-		       || TREE_INVARIANT (rhs)
 		       || TREE_CODE (rhs) == ADDR_EXPR
 		       || DECL_P (rhs))
 		{