re PR debug/46258 (gcc.dg/tree-ssa/pr23820.c: -fcompare-debug failure with -O3 -ffloa...

PR debug/46258
* tree-cfg.c (replace_uses_by): Don't mark BBs as altered on
debug stmts.

From-SVN: r167264

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 04141207db21a9c2d18bd2a4b5cc3d6a663e28aa..edf5d3f24bedb167898bdbad066c9511525c3cd0 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-11-29  Alexandre Oliva  <aoliva@redhat.com>
+
+       PR debug/46258
+       * tree-cfg.c (replace_uses_by): Don't mark BBs as altered on
+       debug stmts.
+
 2010-11-22  Uros Bizjak  <ubizjak@gmail.com>
 
        PR middle-end/43057

diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c
index 300a8bca985fe8e25fa8c2dca46974a6cfdb2556..45e542cb14ea5f43912854cb54fb97db99538bd4 100644 (file)
--- a/gcc/tree-cfg.c
+++ b/gcc/tree-cfg.c
@@ -1526,7 +1526,7 @@ replace_uses_by (tree name, tree val)
          size_t i;
 
          fold_stmt_inplace (stmt);
-         if (cfgcleanup_altered_bbs)
+         if (cfgcleanup_altered_bbs && !is_gimple_debug (stmt))
            bitmap_set_bit (cfgcleanup_altered_bbs, gimple_bb (stmt)->index);
 
          /* FIXME.  This should go in update_stmt.  */