[pypy-commit] pypy default: unroll int_pow if the pow and mod are constant. (based on observing what GCC does)

[alex_gaynor]

Author: Alex Gaynor <alex.gaynor at gmail.com>
Branch: 
Changeset: r47733:b12f33d4cb6b
Date: 2011-09-30 16:47 -0400
http://bitbucket.org/pypy/pypy/changeset/b12f33d4cb6b/

Log:	unroll int_pow if the pow and mod are constant. (based on observing
	what GCC does)

diff --git a/pypy/objspace/std/intobject.py b/pypy/objspace/std/intobject.py
--- a/pypy/objspace/std/intobject.py
+++ b/pypy/objspace/std/intobject.py
@@ -1,12 +1,13 @@
 from pypy.interpreter.error import OperationError
 from pypy.objspace.std import newformat
+from pypy.objspace.std.inttype import wrapint
 from pypy.objspace.std.model import registerimplementation, W_Object
-from pypy.objspace.std.register_all import register_all
 from pypy.objspace.std.multimethod import FailedToImplementArgs
 from pypy.objspace.std.noneobject import W_NoneObject
+from pypy.objspace.std.register_all import register_all
+from pypy.rlib import jit
 from pypy.rlib.rarithmetic import ovfcheck, ovfcheck_lshift, LONG_BIT, r_uint
 from pypy.rlib.rbigint import rbigint
-from pypy.objspace.std.inttype import wrapint
 
 """
 In order to have the same behavior running
@@ -169,7 +170,8 @@
 
 
 # helper for pow()
-def _impl_int_int_pow(space, iv, iw, iz=0):
+ at jit.look_inside_iff(lambda space, iv, iw, iz: jit.isconstant(iw) and jit.isconstant(iz))
+def _impl_int_int_pow(space, iv, iw, iz):
     if iw < 0:
         if iz != 0:
             raise OperationError(space.w_TypeError,
@@ -211,7 +213,7 @@
 def pow__Int_Int_None(space, w_int1, w_int2, w_int3):
     x = w_int1.intval
     y = w_int2.intval
-    return space.wrap(_impl_int_int_pow(space, x, y))
+    return space.wrap(_impl_int_int_pow(space, x, y, 0))
 
 def neg__Int(space, w_int1):
     a = w_int1.intval