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74 Commits

Author SHA1 Message Date
Raymond Hettinger 77578204d6 Restore the data block size to 62. 
The former block size traded away good fit within cache lines in
order to gain faster division in deque_item().  However, compilers
are getting smarter and can now replace the slow division operation
with a fast integer multiply and right shift.  Accordingly, it makes
sense to go back to a size that lets blocks neatly fill entire
cache-lines.

GCC-4.8 and CLANG 4.0 both compute "x // 62" with something
roughly equivalent to "x * 9520900167075897609 >> 69".
 2013-07-28 02:39:49 -07:00
Raymond Hettinger 3223dd5c22 Assertions key off NDEBUG 2013-07-26 23:14:22 -07:00
Raymond Hettinger b97cc49c3a Minor code simplification by eliminating an unnecessary temporary variable. 2013-07-21 01:51:07 -07:00
Raymond Hettinger 90dea4ce43 Tweak the deque struct by moving the least used fields (maxlen and weakref) to the end. 2013-07-13 22:30:25 -07:00
Raymond Hettinger 840533bf1c Use a do-while loop in the inner loop for rotate (m is always greater than zero). 2013-07-13 17:03:58 -07:00
Raymond Hettinger 3959af9b2a Move the freeblock() call outside the main loop to speed-up and simplify the block re-use logic. 2013-07-13 02:34:08 -07:00
Raymond Hettinger d9c116ca40 Add a spacing saving heuristic to deque's extend methods 2013-07-09 00:13:21 -07:00
Raymond Hettinger b385529ddf Fix #ifdef 2013-07-07 02:07:23 -10:00
Raymond Hettinger 82df925451 Use macros for marking and checking endpoints in the doubly-linked list of blocks. 
* Add comment explaining the endpoint checks
* Only do the checks in a debug build
* Simplify newblock() to only require a length argument
  and leave the link updates to the calling code.
* Also add comment for the freelisting logic.
 2013-07-07 01:43:42 -10:00
Raymond Hettinger f3a67b7e57 Improve variable names in deque_count() 2013-07-06 17:49:06 -10:00
Raymond Hettinger df715ba54d Apply the PyObject_VAR_HEAD and Py_SIZE macros 
to be consistent with practices in other modules.
 2013-07-06 13:01:13 -10:00
Raymond Hettinger 5bfa8671bc Refactor deque_traverse(). 
Hoist conditional expression out of the loop.
Use rightblock as the guard instead of checking for NULL.
 2013-07-06 11:58:09 -10:00
Raymond Hettinger 98054b4c1b Remove unnecessary branches from count() and reverse(). 2013-07-06 09:07:06 -10:00
Raymond Hettinger de68e0cf0e Speed-up deque indexing by changing the deque block length to a power of two. 
The division and modulo calculation in deque_item() can be compiled
to fast bitwise operations when the BLOCKLEN is a power of two.

Timing before:

 ~/cpython $ py -m timeit -r7 -s 'from collections import deque' -s 'd=deque(range(10))' 'd[5]'
10000000 loops, best of 7: 0.0627 usec per loop

Timing after:

~/cpython $ py -m timeit -r7 -s 'from collections import deque' -s 'd=deque(range(10))' 'd[5]'
10000000 loops, best of 7: 0.0581 usec per loop
 2013-07-05 18:05:29 -10:00
Raymond Hettinger 20b0f87e1d Misc improvements to collections.deque() 
* Clarified comment on the impact of BLOCKLEN on deque_index
  (with a power-of-two, the division and modulo
   computations are done with a right-shift and bitwise-and).

* Clarified comment on the overflow check to note that
  it is general and not just applicable the 64-bit builds.

* In deque._rotate(), the "deque->" indirections are
  factored-out of the loop (loop invariant code motion),
  leaving the code cleaner looking and slightly faster.

* In deque._rotate(), replaced the memcpy() with an
  equivalent loop.  That saved the memcpy setup time
  and allowed the pointers to move in their natural
  leftward and rightward directions.

See comparative timings at:  http://pastebin.com/p0RJnT5N
 2013-06-23 15:44:33 -07:00
Raymond Hettinger 59cf23ab07 Minor tweaks to varnames, declarations, and comments. 2013-02-07 00:57:19 -05:00
Raymond Hettinger 1f0044c473 Minor variable access clean-ups for deque.rotate(). 2013-02-05 01:30:46 -05:00
Raymond Hettinger a4409c18eb Minor edits: Tighten-up the halflen logic and touch-up the assertions and comments. 2013-02-04 00:08:12 -05:00
Raymond Hettinger 3a9ae7fd98 Issue 16398: One more assertion for good measure. 2013-02-02 12:26:37 -08:00
Raymond Hettinger 231ee4dc9d Issue 16398: Add assertions to show why memcmp is safe. 2013-02-02 11:24:43 -08:00
Raymond Hettinger 21777acd68 Issue 16398: Use memcpy() in deque.rotate(). 2013-02-02 09:56:08 -08:00
Benjamin Peterson fa3965ab76 merge 3.3 2013-01-12 21:22:33 -05:00
Benjamin Peterson 0e5c48a917 make deque_clear void, since it's infallible 2013-01-12 21:22:18 -05:00
Raymond Hettinger 464d89b3ce Issue #16398: Optimize deque.rotate() 2013-01-11 22:29:50 -08:00
Andrew Svetlov 796c443f3d Merge: fix docstring for deque ctor to mark iterable parameter optional 2012-10-31 11:51:13 +02:00
Andrew Svetlov 6a5c7c341a Fix docstring for deque ctor to mark iterable parameter optional 2012-10-31 11:50:40 +02:00
Jesus Cea 1659b75189 MERGE: Closes #15469: Correct __sizeof__ support for deque 2012-08-03 14:52:12 +02:00
Jesus Cea 16e2fca47e Closes #15469: Correct __sizeof__ support for deque 2012-08-03 14:49:42 +02:00
Kristján Valur Jónsson 31668b8f7a Issue #14288: Serialization support for builtin iterators. 2012-04-03 10:49:41 +00:00
Antoine Pitrou 15af7b4a4f Issue #13015: Fix a possible reference leak in defaultdict.__repr__. 
Patch by Suman Saha.
 2012-02-15 02:43:47 +01:00
Antoine Pitrou f5f1fe0cb5 Issue #13015: Fix a possible reference leak in defaultdict.__repr__. 
Patch by Suman Saha.
 2012-02-15 02:42:46 +01:00
Martin v. Löwis bd928fef42 Rename _Py_identifier to _Py_IDENTIFIER. 2011-10-14 10:20:37 +02:00
Martin v. Löwis 1ee1b6fe0d Use identifier API for PyObject_GetAttrString. 2011-10-10 18:11:30 +02:00
Martin v. Löwis afe55bba33 Add API for static strings, primarily good for identifiers. 
Thanks to Konrad Schöbel and Jasper Schulz for helping with the mass-editing.
 2011-10-09 10:38:36 +02:00
Brian Curtin dfc80e3d97 Replace Py_NotImplemented returns with the macro form Py_RETURN_NOTIMPLEMENTED. 
The macro was introduced in #12724.
 2011-08-10 20:28:54 -05:00
Victor Stinner a154b5cea4 Simplify _count_elements() in _collections 
PyIter_Next() cannot return a PyExc_StopIteration: it clears this exception.
 2011-04-20 23:23:52 +02:00
Raymond Hettinger 4974705a02 Issue 11713: clarify docstring for collections.deque() 2011-03-29 17:36:31 -07:00
Raymond Hettinger 512d2cc643 Issue #11004: Repair edge case in deque.count(). 
(Reviewed by Georg Brandl.)

Also made similar changes to deque.reverse() though this wasn't
strictly necessary (the edge case cannot occur with two pointers
moving to meet in the middle).  Making the change in reverse()
was more a matter of future-proofing.
 2011-01-25 21:32:39 +00:00
Raymond Hettinger 426e052a4f Make C helper function more closely match the pure python version, and add tests. 2011-01-03 02:12:02 +00:00
Raymond Hettinger 96f3410ebe Issue 10667: Fast path for collections.Counter 2010-12-15 16:30:37 +00:00
Georg Brandl f038b32d0b Remove more unneeded casts to hashfunc. 2010-10-18 07:35:09 +00:00
Antoine Pitrou 554f33407c Fix <deque iterator>.__length_hint__() under 64-bit Windows. 2010-08-17 18:30:06 +00:00
Antoine Pitrou f95a1b3c53 Recorded merge of revisions 81029 via svnmerge from 
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r81029 | antoine.pitrou | 2010-05-09 16:46:46 +0200 (dim., 09 mai 2010) | 3 lines

  Untabify C files. Will watch buildbots.
........
 2010-05-09 15:52:27 +00:00
Raymond Hettinger 44459debc6 Add count() method to collections.deque(). 2010-04-03 23:20:46 +00:00
Raymond Hettinger 3f9afd816d Fix variants of deque.extend: d.extend(d) d+=d d.extendleft(d) 2009-12-10 03:03:02 +00:00
Raymond Hettinger e5fdedbeda Add a reverse() method to collections.deque(). 2009-12-10 00:47:21 +00:00
Raymond Hettinger 54628fa7c0 Issue 6637: defaultdict.copy() failed with an empty factory. 2009-08-04 19:16:39 +00:00
Raymond Hettinger 5bb0f0e072 For collections.deque() objects, expose the maxlen parameter as a read-only attribute. 2009-03-10 12:56:32 +00:00
Raymond Hettinger 060c7f6bba Small optimization for corner case where maxlen==0. 2009-03-10 09:36:07 +00:00
Mark Dickinson e94c679df0 Issue #1717: rename tp_compare to tp_reserved. I'll change the 
type of tp_compare in a separate commit, for ease of reversion
should things go wrong.
 2009-02-02 20:36:42 +00:00