V4: Only start JITting after a minimum of 3 calls

Change-Id: I748e06041f3085980ce48391ba2d829a9d86a727
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 9 insertions, 9 deletions

diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index c57f39f61c..c97ba38dec 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -168,6 +168,15 @@ ExecutionEngine::ExecutionEngine()
                                              /* writable */ true, /* executable */ false,
                                              /* includesGuardPages */ true);
 
+    {
+        bool ok = false;
+        jitCallCountThreshold = qEnvironmentVariableIntValue("QV4_JIT_CALL_THRESHOLD", &ok);
+        if (!ok)
+            jitCallCountThreshold = 3;
+        if (qEnvironmentVariableIsSet("QV4_FORCE_INTERPRETER"))
+            jitCallCountThreshold = std::numeric_limits<int>::max();
+    }
+
     exceptionValue = jsAlloca(1);
     globalObject = static_cast<Object *>(jsAlloca(1));
     jsObjects = jsAlloca(NJSObjects);
@@ -1545,15 +1554,6 @@ QV4::ReturnedValue ExecutionEngine::metaTypeToJS(int type, const void *data)
     return 0;
 }
 
-bool ExecutionEngine::canJIT()
-{
-#ifdef V4_ENABLE_JIT
-    return true;
-#else
-    return false;
-#endif
-}
-
 // Converts a JS value to a meta-type.
 // data must point to a place that can store a value of the given type.
 // Returns true if conversion succeeded, false otherwise.