V4 IR: Store the phi-node parameters directly in the class.

Every time one of the paramets was accessed, the chain of loads was:
	phi->d->incoming->heapdata[i]
Now it is:
	phi[i + offsetof(incoming)]
This also removes at least one malloc (for the Data), and usually two
(when the number of parameters is <= 4, which is most of the cases).

Change-Id: I953e784647148266ae5a49a93a203d0d22cdcb63
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

1 files changed, 4 insertions, 10 deletions

diff --git a/src/qml/compiler/qv4jsir_p.h b/src/qml/compiler/qv4jsir_p.h
index 974e8dfe0d..0189ff4a23 100644
--- a/src/qml/compiler/qv4jsir_p.h
+++ b/src/qml/compiler/qv4jsir_p.h
@@ -753,21 +753,15 @@ struct Ret: Stmt {
 
 struct Phi: Stmt {
     Temp *targetTemp;
-    struct Data {
-        QVector<Expr *> incoming; // used by Phi nodes
-    };
-
-    Data *d;
+    VarLengthArray<Expr *, 4> incoming;
 
-    Phi(int id): Stmt(id), d(0) {}
+    Phi(int id): Stmt(id) {}
 
     virtual void accept(StmtVisitor *v) { v->visitPhi(this); }
     virtual Phi *asPhi() { return this; }
 
-    void destroyData() {
-        delete d;
-        d = 0;
-    }
+    void destroyData()
+    { incoming.~VarLengthArray(); }
 };
 
 struct Q_QML_PRIVATE_EXPORT Module {