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Backport r69961 to trunk, replacing JUMP_IF_{TRUE,FALSE} with

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POP_JUMP_IF_{TRUE,FALSE} and JUMP_IF_{TRUE,FALSE}_OR_POP. This avoids executing
a POP_TOP on each conditional and sometimes allows the peephole optimizer to
skip a JUMP_ABSOLUTE entirely. It speeds up list comprehensions significantly.
This commit is contained in:
Jeffrey Yasskin 2009-02-28 19:03:21 +00:00
parent de28d6841e
commit 68d6852006
11 changed files with 228 additions and 178 deletions
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Python/import.c
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@ -72,9 +72,11 @@ typedef unsigned short mode_t;
Python 2.6a0: 62151 (peephole optimizations and STORE_MAP opcode)
Python 2.6a1: 62161 (WITH_CLEANUP optimization)
Python 2.7a0: 62171 (optimize list comprehensions/change LIST_APPEND)
Python 2.7a0: 62181 (optimize conditional branches:
introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE)
.
*/
#define MAGIC (62171 | ((long)'\r'<<16) | ((long)'\n'<<24))
#define MAGIC (62181 | ((long)'\r'<<16) | ((long)'\n'<<24))
/* Magic word as global; note that _PyImport_Init() can change the
value of this global to accommodate for alterations of how the