* [Ada] Reduce compilation time at -O0 (4/n)
@ 2011-08-02 10:37 Arnaud Charlet
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From: Arnaud Charlet @ 2011-08-02 10:37 UTC (permalink / raw)
To: gcc-patches; +Cc: Eric Botcazou
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This patch significantly reduces compilation time at -O0 in typical conditions
by removing useless big local temporaries in Allocate_Initialize_Node.
No functional changes.
Tested on x86_64-pc-linux-gnu, committed on trunk
2011-08-02 Eric Botcazou <ebotcazou@adacore.com>
* atree.adb (Allocate_Initialize_Node): Remove useless temporaries.
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Index: atree.adb
===================================================================
--- atree.adb (revision 177090)
+++ atree.adb (working copy)
@@ -481,34 +481,25 @@
(Src : Node_Id;
With_Extension : Boolean) return Node_Id
is
- New_Id : Node_Id := Src;
- Nod : Node_Record := Default_Node;
- Ext1 : Node_Record := Default_Node_Extension;
- Ext2 : Node_Record := Default_Node_Extension;
- Ext3 : Node_Record := Default_Node_Extension;
- Ext4 : Node_Record := Default_Node_Extension;
+ New_Id : Node_Id;
begin
- if Present (Src) then
- Nod := Nodes.Table (Src);
-
- if Has_Extension (Src) then
- Ext1 := Nodes.Table (Src + 1);
- Ext2 := Nodes.Table (Src + 2);
- Ext3 := Nodes.Table (Src + 3);
- Ext4 := Nodes.Table (Src + 4);
- end if;
- end if;
-
- if not (Present (Src)
- and then not Has_Extension (Src)
- and then With_Extension
- and then Src = Nodes.Last)
+ if Present (Src)
+ and then not Has_Extension (Src)
+ and then With_Extension
+ and then Src = Nodes.Last
then
+ New_Id := Src;
+ else
-- We are allocating a new node, or extending a node
-- other than Nodes.Last.
- Nodes.Append (Nod);
+ if Present (Src) then
+ Nodes.Append (Nodes.Table (Src));
+ else
+ Nodes.Append (Default_Node);
+ end if;
+
New_Id := Nodes.Last;
Orig_Nodes.Append (New_Id);
Node_Count := Node_Count + 1;
@@ -524,10 +515,15 @@
-- Set extension nodes if required
if With_Extension then
- Nodes.Append (Ext1);
- Nodes.Append (Ext2);
- Nodes.Append (Ext3);
- Nodes.Append (Ext4);
+ if Present (Src) and then Has_Extension (Src) then
+ for J in 1 .. 4 loop
+ Nodes.Append (Nodes.Table (Src + Node_Id (J)));
+ end loop;
+ else
+ for J in 1 .. 4 loop
+ Nodes.Append (Default_Node_Extension);
+ end loop;
+ end if;
end if;
Orig_Nodes.Set_Last (Nodes.Last);
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2011-08-02 10:37 [Ada] Reduce compilation time at -O0 (4/n) Arnaud Charlet
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