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| author | Raymond Hettinger <python@rcn.com> | 2008-11-18 00:07:10 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2008-11-18 00:07:10 (GMT) |
| commit | e56131b60e6c2e63bcb6ecc2a6b7964d74ab847d (patch) | |
| tree | f4a7a81fd451ece001a74109abe037068c71c85a | |
| parent | a2a08fb932793ffca1e42314c924e0590c6a1038 (diff) | |
| download | cpython-e56131b60e6c2e63bcb6ecc2a6b7964d74ab847d.zip cpython-e56131b60e6c2e63bcb6ecc2a6b7964d74ab847d.tar.gz cpython-e56131b60e6c2e63bcb6ecc2a6b7964d74ab847d.tar.bz2 | |
Issue 2260: Small peephole optimization -- eliminate unnecessary POP_TOP /JUMP_FORWARD 1 pairs.
| -rw-r--r-- | Python/peephole.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Python/peephole.c b/Python/peephole.c index b9b26fc..d31c89b 100644 --- a/Python/peephole.c +++ b/Python/peephole.c @@ -430,6 +430,16 @@ PyCode_Optimize(PyObject *code, PyObject* consts, PyObject *names, cumlc = 0; break; + /* Replace POP_TOP JUMP_FORWARD 1 POP_TOP + with NOP NOP NOP NOP POP_TOP. */ + case POP_TOP: + if (UNCONDITIONAL_JUMP(codestr[i+1]) && + GETJUMPTGT(codestr, i+1) == i+5 && + codestr[i+4] == POP_TOP && + ISBASICBLOCK(blocks,i,4)) + memset(codestr+i, NOP, 4); + break; + /* Try to fold tuples of constants (includes a case for lists which are only used for "in" and "not in" tests). Skip over BUILD_SEQN 1 UNPACK_SEQN 1. |