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| author | Raymond Hettinger <python@rcn.com> | 2008-11-18 00:07:10 +0000 |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2008-11-18 00:07:10 +0000 |
| commit | 84714d0fec486b98a08c02213ea65d183b525be3 (patch) | |
| tree | 685de3330abaeeede9b78735e8b0cf6af19568af /Python/peephole.c | |
| parent | 2597510dc5f825a80d6e4198d4b6acc331332054 (diff) | |
| download | cpython-84714d0fec486b98a08c02213ea65d183b525be3.tar.gz | |
Issue 2260: Small peephole optimization -- eliminate unnecessary POP_TOP /JUMP_FORWARD 1 pairs.
Diffstat (limited to 'Python/peephole.c')
| -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 b9b26fc0a7..d31c89b86e 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. |