438f9134cf
Mirco-optimizations to reduce register spills and reloads observed on CLANG and GCC.
2015-02-09 06:48:29 -06:00
8249282622
Minor code clean up.
2015-02-04 08:37:02 -08:00
06bb1226d1
Issue 23359: Reduce size of code in set_lookkey. Only do linear probes when there is no wrap-around.
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Nice simplification contributed by Serhiy Storchaka :-)
2015-02-03 08:15:30 -08:00
c658d85487
Issue 23359: Tighten inner search loop for sets (don't and-mask every entry lookup).
2015-02-02 08:35:00 -08:00
59ecabd12a
Keep the definition of i consistent between set_lookkey() and set_insert_clean().
2015-01-31 02:45:12 -08:00
9edd753229
Minor tweak to improve code clarity.
2015-01-30 20:09:23 -08:00
06a1c8dfa0
Fix typo in a comment.
2015-01-30 18:02:15 -08:00
f8d1a31e70
Revert unintended part of the commit (the key==dummy test wasn't supposed to change).
2015-01-26 22:06:43 -08:00
a5ebbf6295
Remove unneeded dummy test from the set search loop (when the hashes match we know the key is not a dummy).
2015-01-26 21:54:35 -08:00
3037e84ad1
Issue #23269 : Tighten search_loop in set_insert_clean()
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Instead of masking and shifting every loopup, move the wrap-around
test outside of the inner-loop.
2015-01-26 21:33:48 -08:00
b335dfe7fa
Set the hash values of dummy entries to -1. Improves quality of entry->hash == hash tests.
2015-01-25 16:38:52 -08:00
4d45c1069b
Update out-of-date comments.
2015-01-25 16:27:40 -08:00
93035c44fd
Issue #23119 : Simplify setobject by inlining the special case for unicode equality testing.
2015-01-25 16:12:49 -08:00
ed741d4ff0
A hybrid of and-masking and a conditional-set-to-zero produce even faster search loop.
2015-01-18 21:25:15 -08:00
bd9b200b87
Update copyright for 2015 updates.
2015-01-18 16:10:30 -08:00
9cd6a789c6
Clean-up, simplify, and slightly speed-up bounds logic in set_pop().
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Elsewhere in the setobject.c code we do a bitwise-and with the mask
instead of using a conditional to reset to zero on wrap-around.
Using that same technique here use gives cleaner, faster, and more
consistent code.
2015-01-18 16:06:18 -08:00
1202a4733e
Issue 23261: Clean-up the hack to store the set.pop() search finger in a hash field instead of the setobject.
2015-01-18 13:12:42 -08:00
8edf27c134
Small clean-up. Factor-out common code for add, contains, and discard function pairs.
2014-12-26 23:08:58 -08:00
08e3dc0ad6
Issue #23107 : Tighten-up loops in setobject.c
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* Move the test for an exact key match to after a hash match
* Use "used" as a loop counter instead of "fill"
* Minor improvements to variable names and code consistency
2014-12-26 20:14:00 -08:00
12174a5dca
Issue #22156 : Fix "comparison between signed and unsigned integers" compiler
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warnings in the Objects/ subdirectory.
PyType_FromSpecWithBases() and PyType_FromSpec() now reject explicitly negative
slot identifiers.
2014-08-15 23:17:38 +02:00
426d9958a2
Add development comments to setobject.c
2014-05-18 21:40:20 +01:00
6ba5665fc7
Fix typo in comment.
2014-01-14 08:15:03 -05:00
74fc8c47f6
Add comments to frozenset_hash().
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Also, provide a minor hint to the compiler on how to group the xors.
2014-01-05 12:00:31 -08:00
e259f13874
Minor code clean-up. Keep the C-API all in one section.
2013-12-15 11:56:14 -08:00
710a67edfc
Note that LINEAR_PROBES can be set to zero.
2013-09-21 20:17:31 -07:00
4ef0528b97
Minor beautification. Put updates and declarations in a more logical order.
2013-09-21 15:39:49 -07:00
0ce1953bf7
When LINEAR_PROBES=0, let the compiler remove the dead code on its own.
2013-09-21 14:07:18 -07:00
c70a2b7bb9
Make the linear probe sequence clearer.
2013-09-21 14:02:55 -07:00
8408dc581e
Issue 18771: Make it possible to set the number linear probes at compile-time.
2013-09-15 14:57:15 -07:00
742d8716ff
Put the defines in the logical section and fix indentation.
2013-09-08 00:25:57 -07:00
583cd03fd1
Minor code beautification.
2013-09-07 22:06:35 -07:00
4ea9080da9
Improve code clarity by removing two unattractive macros.
2013-09-07 21:01:29 -07:00
8f8839e10a
Remove the freelist scheme for setobjects.
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The setobject freelist was consuming memory but not providing much value.
Even when a freelisted setobject was available, most of the setobject
fields still needed to be initialized and the small table still required
a memset(). This meant that the custom freelisting scheme for sets was
providing almost no incremental benefit over the default Python freelist
scheme used by _PyObject_Malloc() in Objects/obmalloc.c.
2013-09-07 20:26:50 -07:00
04fd9dd52b
Small rearrangement to bring together the three functions for probing the hash table.
2013-09-07 17:41:01 -07:00
ae7b00e2d3
Move the overview comment to the top of the file.
2013-09-07 15:05:00 -07:00
c56e0e3980
Minor touchups.
2013-09-02 16:32:27 -07:00
69492dab07
Factor-out the common code for setting a KeyError.
2013-09-02 15:59:26 -07:00
a35adf5b09
Instead of XORed indicies, switch to a hybrid of linear probing and open addressing.
...
Modern processors tend to make consecutive memory accesses cheaper than
random probes into memory.
Small sets can fit into L1 cache, so they get less benefit. But they do
come out ahead because the consecutive probes don't probe the same key
more than once and because the randomization step occurs less frequently
(or not at all).
For the open addressing step, putting the perturb shift before the index
calculation gets the upper bits into play sooner.
2013-09-02 03:23:21 -07:00
6c3c1ccd1b
Update copyright.
2013-08-31 21:34:24 -07:00
95c0d67581
Further reduce the cost of hash collisions by inspecting an additional nearby entry.
2013-08-31 21:27:08 -07:00
afe890923f
Tighten-up the lookkey() logic and beautify the code a bit.
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Use less code by moving many of the steps from the initial
lookup into the main search loop.
Beautify the code but keep the overall logic unchanged.
2013-08-28 20:59:31 -07:00
9d95254bb7
Issue #18772 : fix the gdb plugin after the set implementation changes
2013-08-24 21:07:07 +02:00
bfc1e1a9cd
Add the same dummy type that is used in dictionaries.
2013-08-23 03:22:15 -05:00
fcf3b500ba
Issue 18797: Remove unneeded refcount adjustments for dummy objects.
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It suffices to keep just one reference when the object is created.
2013-08-22 08:20:31 -07:00
5bb1b1dd6f
Hoist the global dummy lookup out of the inner loop for set_merge().
2013-08-21 01:34:18 -07:00
929cbac307
Remove a redundant hash table probe (this was artifact from an earlier draft of the patch).
2013-08-20 23:03:28 -07:00
ae9e616a00
Issue 18772: Restore set dummy object back to unicode and restore the identity checks in lookkey().
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The Gdb prettyprint plugin depended on the dummy object being displayable.
Other solutions besides a unicode object are possible. For now, get it
back up and running.
The identity checks in lookkey() need to be there to prevent the dummy
object from leaking through Py_RichCompareBool() into user code in the
rare circumstance where the dummy's hash value exactly matches the hash
value of the actual key being looked up.
2013-08-20 22:28:24 -07:00
3c0a4f5def
Issue18771: Reduce the cost of hash collisions for set objects.
2013-08-19 07:36:04 -07:00
07351a0449
Remove the else-clause because the conditions are no longer mutually exclusive.
2013-08-17 02:39:46 -07:00
237b34b074
Use a known unique object for the dummy entry.
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This lets us run PyObject_RichCompareBool() without
first needing to check whether the entry is a dummy.
2013-08-17 02:31:53 -07:00
Raymond Hettinger
Victor Stinner
Eric V. Smith
Antoine Pitrou