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| author | Antoine Pitrou <solipsis@pitrou.net> | 2010-09-04 18:43:52 (GMT) |
|---|---|---|
| committer | Antoine Pitrou <solipsis@pitrou.net> | 2010-09-04 18:43:52 (GMT) |
| commit | 74a69fa662fb844ad3c60eb27b09e5fa1e577305 (patch) | |
| tree | 251ba06cc429ab62a204e28bece4f382e179c7bf /Doc/library/dis.rst | |
| parent | ef0e6c3b0485e83444b15c07f9cb1d905203791a (diff) | |
| download | cpython-74a69fa662fb844ad3c60eb27b09e5fa1e577305.zip cpython-74a69fa662fb844ad3c60eb27b09e5fa1e577305.tar.gz cpython-74a69fa662fb844ad3c60eb27b09e5fa1e577305.tar.bz2 | |
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.
Diffstat (limited to 'Doc/library/dis.rst')
| -rw-r--r-- | Doc/library/dis.rst | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst index e5c1c1a..a377fc8 100644 --- a/Doc/library/dis.rst +++ b/Doc/library/dis.rst @@ -184,15 +184,15 @@ The Python compiler currently generates the following bytecode instructions. three. -.. opcode:: ROT_FOUR +.. opcode:: DUP_TOP - Lifts second, third and forth stack item one position up, moves top down to - position four. + Duplicates the reference on top of the stack. -.. opcode:: DUP_TOP +.. opcode:: DUP_TOP_TWO - Duplicates the reference on top of the stack. + Duplicates the two references on top of the stack, leaving them in the + same order. **Unary operations** @@ -531,12 +531,6 @@ the more significant byte last. are put onto the stack right-to-left. -.. opcode:: DUP_TOPX (count) - - Duplicate *count* items, keeping them in the same order. Due to implementation - limits, *count* should be between 1 and 5 inclusive. - - .. opcode:: STORE_ATTR (namei) Implements ``TOS.name = TOS1``, where *namei* is the index of name in |