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| author | Raymond Hettinger <python@rcn.com> | 2003-04-22 06:49:11 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2003-04-22 06:49:11 (GMT) |
| commit | 060641d51160f6bf49a049bb677f8412b5a19de3 (patch) | |
| tree | 1ad7d568e797a6387b7f0792f5286f901b8f4f32 /Lib | |
| parent | 0c83348d5c110a6ca706219019e97d5cefe2fddb (diff) | |
| download | cpython-060641d51160f6bf49a049bb677f8412b5a19de3.zip cpython-060641d51160f6bf49a049bb677f8412b5a19de3.tar.gz cpython-060641d51160f6bf49a049bb677f8412b5a19de3.tar.bz2 | |
Improved the bytecode optimizer.
* Can now test for basic blocks.
* Optimize inverted comparisions.
* Optimize unary_not followed by a conditional jump.
* Added a new opcode, NOP, to keep code size constant.
* Applied NOP to previous transformations where appropriate.
Note, the NOP would not be necessary if other functions were
added to re-target jump addresses and update the co_lnotab mapping.
That would yield slightly faster and cleaner bytecode at the
expense of optimizer simplicity and of keeping it decoupled
from the line-numbering structure.
Diffstat (limited to 'Lib')
| -rw-r--r-- | Lib/opcode.py | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/opcode.py b/Lib/opcode.py index cfde5f8..15f92a7 100644 --- a/Lib/opcode.py +++ b/Lib/opcode.py @@ -49,6 +49,8 @@ def_op('ROT_THREE', 3) def_op('DUP_TOP', 4) def_op('ROT_FOUR', 5) +def_op('NOP', 9) + def_op('UNARY_POSITIVE', 10) def_op('UNARY_NEGATIVE', 11) def_op('UNARY_NOT', 12) |