Microoptimizations

src/runtime/descr.cpp

@@ -298,7 +298,7 @@ Box* BoxedMethodDescriptor::tppCall(Box* _self, CallRewriteArgs* rewrite_args, A
     Box** oargs = NULL;
 
     Box* oargs_array[1];
-    if (paramspec.totalReceived() >= 3) {
+    if (paramspec.totalReceived() > 3) {
         assert((paramspec.totalReceived() - 3) <= sizeof(oargs_array) / sizeof(oargs_array[0]));
         oargs = oargs_array;
     }

src/runtime/int.cpp

@@ -1018,7 +1018,7 @@ template <ExceptionStyle S> Box* intNew(Box* _cls, Box* val, Box* base) noexcept
             return n;
 
         if (S == CAPI) {
-            PyErr_Format(OverflowError, "Python int too large to convert to C long");
+            PyErr_SetString(OverflowError, "Python int too large to convert to C long");
             return NULL;
         } else
             raiseExcHelper(OverflowError, "Python int too large to convert to C long");

src/runtime/objmodel.cpp

@@ -3074,13 +3074,25 @@ void rearrangeArguments(ParamReceiveSpec paramspec, const ParamNames* param_name
     for (int i = 3; i < num_passed_args; i++) {
         assert(gc::isValidGCObject(args[i - 3]) || args[i - 3] == NULL);
     }
-
+    assert((oargs != NULL) == (num_output_args > 3));
     assert((defaults != NULL) == (paramspec.num_defaults != 0));
 
     if (rewrite_args) {
         rewrite_success = false; // default case
     }
 
+    // Super fast path:
+    if (argspec.num_keywords == 0 && !argspec.has_starargs && !paramspec.takes_varargs && !argspec.has_kwargs
+        && argspec.num_args == paramspec.num_args && !paramspec.takes_kwargs) {
+        rewrite_success = true;
+        oarg1 = arg1;
+        oarg2 = arg2;
+        oarg3 = arg3;
+        if (num_output_args > 3)
+            memcpy(oargs, args, sizeof(Box*) * (num_output_args - 3));
+        return;
+    }
+
     // Fast path: if it's a simple-enough call, we don't have to do anything special.  On a simple
     // django-admin test this covers something like 93% of all calls to callFunc.
     if (argspec.num_keywords == 0 && argspec.has_starargs == paramspec.takes_varargs && !argspec.has_kwargs

src/runtime/types.cpp

@@ -877,7 +877,8 @@ static Box* typeCallInner(CallRewriteArgs* rewrite_args, ArgPassSpec argspec, Bo
     } else {
         new_attr = typeLookup(cls, new_str, NULL);
         try {
-            new_attr = processDescriptor(new_attr, None, cls);
+            if (new_attr->cls != function_cls) // optimization
+                new_attr = processDescriptor(new_attr, None, cls);
         } catch (ExcInfo e) {
             if (S == CAPI) {
                 setCAPIException(e);