Commit Graph

13 Commits

Author SHA1 Message Date
Raymond Hettinger d882e36f45 Fix constantification of None. 2007-03-02 19:19:05 +00:00
Raymond Hettinger afd842f5b2 Teach the peepholer to fold unary operations on constants.
Afterwards, -0.5 loads in a single step and no longer requires a runtime
UNARY_NEGATIVE operation.
2005-02-20 12:46:54 +00:00
Brett Cannon 64d904b715 Remove set conversion optimization test (backed out of Python/compile.c in rev.
2.344).
2005-02-10 20:40:29 +00:00
Raymond Hettinger 7fcb7869ba Adopt Skip's idea to optimize lists of constants in the context
of a "in" or "not in" test.
2005-02-07 19:32:38 +00:00
Raymond Hettinger a164574937 Transform "x in (1,2,3)" to "x in frozenset([1,2,3])".
Inspired by Skip's idea to recognize the throw-away nature of sequences
in this context and to transform their type to one with better performance.
2005-02-06 22:05:42 +00:00
Raymond Hettinger 9feb267caf Do not fold a constant if a large sequence will result.
Saves space in the presence of code like: (None,)*10000
2005-01-26 12:50:05 +00:00
Raymond Hettinger 922b3e2098 Remove test for BINARY_DIVIDE. 2005-01-07 18:34:56 +00:00
Raymond Hettinger c34f8673a1 Teach the peephole optimizer to fold simple constant expressions. 2005-01-02 06:17:33 +00:00
Raymond Hettinger 5dec096e6a Maintain peepholer's cumlc invariant by updating the running total
everytime a LOAD_CONSTANT is encountered, created, or overwritten.

Added two tests to cover cases affected by the patch.
2004-11-02 04:20:10 +00:00
Raymond Hettinger 23109ef11e SF bug #1053819: Segfault in tuple_of_constants
Peepholer could be fooled into misidentifying a tuple_of_constants.
Added code to count consecutive occurrences of LOAD_CONST.
Use the count to weed out the misidentified cases.
Added a unittest.
2004-10-26 08:59:14 +00:00
Raymond Hettinger 2c31a058eb SF patch #1031667: Fold tuples of constants into a single constant
Example:
>>> import dis
>>> dis.dis(compile('1,2,3', '', 'eval'))
  0           0 LOAD_CONST               3 ((1, 2, 3))
              3 RETURN_VALUE
2004-09-22 18:44:21 +00:00
Tim Peters 66cb018c96 Whitespace normalization. 2004-08-26 05:23:19 +00:00
Raymond Hettinger fd2d1f7870 SF Patch #1013667: Cleanup Peepholer Output
* Make a pass to eliminate NOPs.  Produce code that is more readable,
  more compact, and a tiny bit faster.  Makes the peepholer more flexible
  in the scope of allowable transformations.

* With Guido's okay, bumped up the magic number so that this patch gets
  widely exercised before the alpha goes out.
2004-08-23 23:37:48 +00:00