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| author | Raymond Hettinger <python@rcn.com> | 2003-03-16 03:11:04 +0000 |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2003-03-16 03:11:04 +0000 |
| commit | f606f87b31186e7614cbae8e5b8ef05700f6267e (patch) | |
| tree | 66c3ae468afb4b6ae4684a904d01d9a332a825b8 /Python/codecs.c | |
| parent | 0070f007f4b30a31e7f59ec798ae6f555bcb0c08 (diff) | |
| download | cpython-git-f606f87b31186e7614cbae8e5b8ef05700f6267e.tar.gz | |
Introduced macros for a simple opcode prediction protocol.
Applied to common cases:
COMPARE_OP is often followed by a JUMP_IF.
JUMP_IF is usually followed by POP_TOP.
Shows improved timings on PyStone, PyBench, and specific tests
using timeit.py:
python timeit.py -s "x=1" "if x==1: pass"
python timeit.py -s "x=1" "if x==2: pass"
python timeit.py -s "x=1" "if x: pass"
python timeit.py -s "x=100" "while x!=1: x-=1"
Potential future candidates:
GET_ITER predicts FOR_ITER
FOR_ITER predicts STORE_FAST or UNPACK_SEQUENCE
Also, applied missing goto fast_next_opcode to DUP_TOPX.
Diffstat (limited to 'Python/codecs.c')
0 files changed, 0 insertions, 0 deletions