[PATCH GCC][2/4]Remove interface initialize_root in predcom

[Bin Cheng]

Hi,
This simple patch removes interface initialize_root.  It's simple enough and 
called only once.
Bootstrap(O2/O3) in patch series on x86_64 and AArch64.  Is it OK?

Thanks,
bin
2017-06-21  Bin Cheng  <bin.ch...@arm.com>

        * tree-predcom.c (initialize_root): Delete.
        (execute_pred_commoning_chain): Initialize root vars and replace
        reference of non-combined chain directly, rather than call above
        function.
From 5670159613b9582437d3713aa69578e1a6b2cf0c Mon Sep 17 00:00:00 2001
From: Bin Cheng <binch...@e108451-lin.cambridge.arm.com>
Date: Tue, 20 Jun 2017 16:31:43 +0100
Subject: [PATCH 4/6] remove-initialize_root-20170620.txt

---
 gcc/tree-predcom.c | 30 +++++++++---------------------
 1 file changed, 9 insertions(+), 21 deletions(-)

diff --git a/gcc/tree-predcom.c b/gcc/tree-predcom.c
index 0238e87..1c5944d 100644
--- a/gcc/tree-predcom.c
+++ b/gcc/tree-predcom.c
@@ -1536,23 +1536,6 @@ initialize_root_vars (struct loop *loop, chain_p chain, 
bitmap tmp_vars)
     }
 }
 
-/* Create the variables and initialization statement for root of chain
-   CHAIN.  Uids of the newly created temporary variables are marked
-   in TMP_VARS.  */
-
-static void
-initialize_root (struct loop *loop, chain_p chain, bitmap tmp_vars)
-{
-  dref root = get_chain_root (chain);
-  bool in_lhs = (chain->type == CT_STORE_LOAD
-                || chain->type == CT_COMBINATION);
-
-  initialize_root_vars (loop, chain, tmp_vars);
-  replace_ref_with (root->stmt,
-                   chain->vars[chain->length],
-                   true, in_lhs);
-}
-
 /* Initializes a variable for load motion for ROOT and prepares phi nodes and
    initialization on entry to LOOP if necessary.  The ssa name for the variable
    is stored in VARS.  If WRITTEN is true, also a phi node to copy its value
@@ -1749,6 +1732,7 @@ execute_pred_commoning_chain (struct loop *loop, chain_p 
chain,
   unsigned i;
   dref a;
   tree var;
+  bool in_lhs;
 
   if (chain->combined)
     {
@@ -1758,10 +1742,14 @@ execute_pred_commoning_chain (struct loop *loop, 
chain_p chain,
     }
   else
     {
-      /* For non-combined chains, set up the variables that hold its value,
-        and replace the uses of the original references by these
-        variables.  */
-      initialize_root (loop, chain, tmp_vars);
+      /* For non-combined chains, set up the variables that hold its value.  */
+      initialize_root_vars (loop, chain, tmp_vars);
+      a = get_chain_root (chain);
+      in_lhs = (chain->type == CT_STORE_LOAD
+               || chain->type == CT_COMBINATION);
+      replace_ref_with (a->stmt, chain->vars[chain->length], true, in_lhs);
+
+      /* Replace the uses of the original references by these variables.  */
       for (i = 1; chain->refs.iterate (i, &a); i++)
        {
          var = chain->vars[chain->length - a->distance];
-- 
1.9.1