68d6852006
Backport r69961 to trunk, replacing JUMP_IF_{TRUE,FALSE} with
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POP_JUMP_IF_{TRUE,FALSE} and JUMP_IF_{TRUE,FALSE}_OR_POP. This avoids executing
a POP_TOP on each conditional and sometimes allows the peephole optimizer to
skip a JUMP_ABSOLUTE entirely. It speeds up list comprehensions significantly.
2009-02-28 19:03:21 +00:00
20e1199fbe
Fix embarrassing typo and fix constantification of None
2007-03-02 19:20:46 +00:00
cbeb687c68
Update the peephole optimizer to remove more dead code (jumps after returns)
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and inline jumps to returns.
2006-10-14 21:33:38 +00:00
afd842f5b2
Teach the peepholer to fold unary operations on constants.
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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
64d904b715
Remove set conversion optimization test (backed out of Python/compile.c in rev.
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2.344).
2005-02-10 20:40:29 +00:00
7fcb7869ba
Adopt Skip's idea to optimize lists of constants in the context
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of a "in" or "not in" test.
2005-02-07 19:32:38 +00:00
a164574937
Transform "x in (1,2,3)" to "x in frozenset([1,2,3])".
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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
9feb267caf
Do not fold a constant if a large sequence will result.
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Saves space in the presence of code like: (None,)*10000
2005-01-26 12:50:05 +00:00
922b3e2098
Remove test for BINARY_DIVIDE.
2005-01-07 18:34:56 +00:00
c34f8673a1
Teach the peephole optimizer to fold simple constant expressions.
2005-01-02 06:17:33 +00:00
5dec096e6a
Maintain peepholer's cumlc invariant by updating the running total
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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
23109ef11e
SF bug #1053819 : Segfault in tuple_of_constants
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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
2c31a058eb
SF patch #1031667 : Fold tuples of constants into a single constant
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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
66cb018c96
Whitespace normalization.
2004-08-26 05:23:19 +00:00
fd2d1f7870
SF Patch #1013667 : Cleanup Peepholer Output
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* 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
Jeffrey Yasskin
Raymond Hettinger
Neal Norwitz
Brett Cannon
Tim Peters