tree-ssa-live.c (remove_unused_locals): Skip when not optimizing.

[gcc.git] / gcc / tree-ssa-live.c

diff --git a/gcc/tree-ssa-live.c b/gcc/tree-ssa-live.c
index 3c317661388712843d9e2ed6a037c3df96c43490..a02b1c5209f89e789f278d055c3eceb3b817edb5 100644 (file)
--- a/gcc/tree-ssa-live.c
+++ b/gcc/tree-ssa-live.c
@@ -639,6 +639,12 @@ remove_unused_locals (void)
   var_ann_t ann;
   bitmap global_unused_vars = NULL;
 
+  /* Removing declarations from lexical blocks when not optimizing is
+     not only a waste of time, it actually causes differences in stack
+     layout.  */
+  if (!optimize)
+    return;
+
   mark_scope_block_unused (DECL_INITIAL (current_function_decl));
 
   /* Assume all locals are unused.  */
@@ -701,8 +707,7 @@ remove_unused_locals (void)
 
       if (TREE_CODE (var) != FUNCTION_DECL
          && (!(ann = var_ann (var))
-             || !ann->used)
-         && (optimize || DECL_ARTIFICIAL (var)))
+             || !ann->used))
        {
          if (is_global_var (var))
            {
@@ -761,8 +766,7 @@ remove_unused_locals (void)
        && TREE_CODE (t) != PARM_DECL
        && TREE_CODE (t) != RESULT_DECL
        && !(ann = var_ann (t))->used
-       && !TREE_ADDRESSABLE (t)
-       && (optimize || DECL_ARTIFICIAL (t)))
+       && !TREE_ADDRESSABLE (t))
       remove_referenced_var (t);
   remove_unused_scope_block_p (DECL_INITIAL (current_function_decl));
   if (dump_file && (dump_flags & TDF_DETAILS))