Mirrors/cpython - cpython - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Amaury Forgeot d'Arc	ba117ef7e9	#4617 : Previously it was illegal to delete a name from the local namespace if it occurs as a free variable in a nested block. This limitation of the compiler has been lifted, and a new opcode introduced (DELETE_DEREF). This sample was valid in 2.6, but fails to compile in 3.x without this change:: >>> def f(): ... def print_error(): ... print(e) ... try: ... something ... except Exception as e: ... print_error() ... # implicit "del e" here This sample has always been invalid in Python, and now works:: >>> def outer(x): ... def inner(): ... return x ... inner() ... del x There is no need to bump the PYC magic number: the new opcode is used for code that did not compile before.	16 years ago
Antoine Pitrou	74a69fa662	Issue #9225 : Remove the ROT_FOUR and DUP_TOPX opcode, the latter replaced by the new (and simpler) DUP_TOP_TWO. Performance isn't changed, but our bytecode is a bit simplified. Patch by Demur Rumed.	16 years ago
Antoine Pitrou	7f14f0d8a0	Recorded merge of revisions 81032 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ................ r81032 \| antoine.pitrou \| 2010-05-09 17:52:27 +0200 (dim., 09 mai 2010) \| 9 lines Recorded merge of revisions 81029 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r81029 \| antoine.pitrou \| 2010-05-09 16:46:46 +0200 (dim., 09 mai 2010) \| 3 lines Untabify C files. Will watch buildbots. ........ ................	16 years ago
Antoine Pitrou	f95a1b3c53	Recorded merge of revisions 81029 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r81029 \| antoine.pitrou \| 2010-05-09 16:46:46 +0200 (dim., 09 mai 2010) \| 3 lines Untabify C files. Will watch buildbots. ........	16 years ago
Benjamin Peterson	876b2f286b	Merged revisions 72912,72920,72940 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r72912 \| benjamin.peterson \| 2009-05-25 08:13:44 -0500 (Mon, 25 May 2009) \| 5 lines add a SETUP_WITH opcode It speeds up the with statement and correctly looks up the special methods involved. ........ r72920 \| benjamin.peterson \| 2009-05-25 15:12:57 -0500 (Mon, 25 May 2009) \| 1 line take into account the fact that SETUP_WITH pushes a finally block ........ r72940 \| benjamin.peterson \| 2009-05-26 07:49:59 -0500 (Tue, 26 May 2009) \| 1 line teach the peepholer about SETUP_WITH ........	17 years ago
Jeffrey Yasskin	9de7ec7868	http://bugs.python.org/issue4715 This patch by Antoine Pitrou optimizes the bytecode for conditional branches by merging the following "POP_TOP" instruction into the conditional jump. For example, the list comprehension "[x for x in l if not x]" produced the following bytecode: 1 0 BUILD_LIST 0 3 LOAD_FAST 0 (.0) >> 6 FOR_ITER 23 (to 32) 9 STORE_FAST 1 (x) 12 LOAD_FAST 1 (x) 15 JUMP_IF_TRUE 10 (to 28) 18 POP_TOP 19 LOAD_FAST 1 (x) 22 LIST_APPEND 2 25 JUMP_ABSOLUTE 6 >> 28 POP_TOP 29 JUMP_ABSOLUTE 6 >> 32 RETURN_VALUE but after the patch it produces the following bytecode: 1 0 BUILD_LIST 0 3 LOAD_FAST 0 (.0) >> 6 FOR_ITER 18 (to 27) 9 STORE_FAST 1 (x) 12 LOAD_FAST 1 (x) 15 POP_JUMP_IF_TRUE 6 18 LOAD_FAST 1 (x) 21 LIST_APPEND 2 24 JUMP_ABSOLUTE 6 >> 27 RETURN_VALUE Notice that not only the code is shorter, but the conditional jump (POP_JUMP_IF_TRUE) jumps right to the start of the loop instead of going through the JUMP_ABSOLUTE at the end. "continue" statements are helped similarly. Furthermore, the old jump opcodes (JUMP_IF_FALSE, JUMP_IF_TRUE) have been replaced by two new opcodes: - JUMP_IF_TRUE_OR_POP, which jumps if true and pops otherwise - JUMP_IF_FALSE_OR_POP, which jumps if false and pops otherwise	17 years ago
Antoine Pitrou	b52ec78baf	Issue #4753 : By enabling a configure option named '--with-computed-gotos' on compilers that support it (notably: gcc, SunPro, icc), the bytecode evaluation loop is compiled with a new dispatch mechanism which gives speedups of up to 20%, depending on the system, on various benchmarks.	17 years ago