* zh_CN.po: Update.

[pf3gnuchains/gcc-fork.git] / gcc / passes.c

diff --git a/gcc/passes.c b/gcc/passes.c
index b03eae3..7673c67 100644 (file)
--- a/gcc/passes.c
+++ b/gcc/passes.c
@@ -420,7 +420,25 @@ next_pass_1 (struct tree_opt_pass **list, struct tree_opt_pass *pass)
           
 }
 
-/* Construct the pass tree.  */
+/* Construct the pass tree.  The sequencing of passes is driven by
+   the cgraph routines:
+
+   cgraph_finalize_compilation_unit ()
+       for each node N in the cgraph
+          cgraph_analyze_function (N)
+              cgraph_lower_function (N) -> all_lowering_passes
+
+   If we are optimizing, cgraph_optimize is then invoked:
+
+   cgraph_optimize ()
+       ipa_passes ()                   -> all_ipa_passes
+       cgraph_expand_all_functions ()
+           for each node N in the cgraph
+              cgraph_expand_function (N)
+                  cgraph_lower_function (N)    -> Now a NOP.
+                  lang_hooks.callgraph.expand_function (DECL (N))
+                       tree_rest_of_compilation (DECL (N))  -> all_passes
+*/
 
 void
 init_optimization_passes (void)
@@ -439,9 +457,8 @@ init_optimization_passes (void)
   NEXT_PASS (pass_ipa_type_escape);
   *p = NULL;
 
-  /* All passes needed to lower the function into shape optimizers can operate
-     on.  These passes are performed before interprocedural passes, unlike rest
-     of local passes (all_passes).  */
+  /* All passes needed to lower the function into shape optimizers can
+     operate on.  */
   p = &all_lowering_passes;
   NEXT_PASS (pass_remove_useless_stmts);
   NEXT_PASS (pass_mudflap_1);
@@ -521,6 +538,7 @@ init_optimization_passes (void)
      propagate away the degenerate PHI nodes.  */
   NEXT_PASS (pass_phi_only_copy_prop);
 
+  NEXT_PASS (pass_reassoc);
   NEXT_PASS (pass_dce);
   NEXT_PASS (pass_dse);
   NEXT_PASS (pass_may_alias);
@@ -536,10 +554,10 @@ init_optimization_passes (void)
   NEXT_PASS (pass_may_alias);
   NEXT_PASS (pass_cse_reciprocals);
   NEXT_PASS (pass_split_crit_edges);
-  NEXT_PASS (pass_reassoc);
   NEXT_PASS (pass_pre);
   NEXT_PASS (pass_sink_code);
   NEXT_PASS (pass_tree_loop);
+  NEXT_PASS (pass_reassoc);
   NEXT_PASS (pass_dominator);
 
   /* The only copy propagation opportunities left after DOM
@@ -588,14 +606,14 @@ init_optimization_passes (void)
   /* NEXT_PASS (pass_may_alias) cannot be done again because the
      vectorizer creates alias relations that are not supported by
      pass_may_alias.  */
-  NEXT_PASS (pass_lower_vector_ssa);
   NEXT_PASS (pass_complete_unroll);
   NEXT_PASS (pass_iv_optimize);
   NEXT_PASS (pass_tree_loop_done);
   *p = NULL;
 
   p = &pass_vectorize.sub;
-  NEXT_PASS (pass_dce);
+  NEXT_PASS (pass_lower_vector_ssa);
+  NEXT_PASS (pass_dce_loop);
   *p = NULL;
 
   p = &pass_loop2.sub;