mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-09-03 15:31:08 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 11

Issue #9225: Remove the ROT_FOUR and DUP_TOPX opcode, the latter replaced

Browse source 
by the new (and simpler) DUP_TOP_TWO.  Performance isn't changed, but
our bytecode is a bit simplified.  Patch by Demur Rumed.
This commit is contained in:
Antoine Pitrou 2010-09-04 18:43:52 +00:00
parent ef0e6c3b04
commit 74a69fa662
9 changed files with 31 additions and 62 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Python/compile.c
View file

@ -680,8 +680,8 @@ opcode_stack_effect(int opcode, int oparg)
return 0;
case DUP_TOP:
return 1;
case ROT_FOUR:
return 0;
case DUP_TOP_TWO:
return 2;
case UNARY_POSITIVE:
case UNARY_NEGATIVE:
@ -782,8 +782,6 @@ opcode_stack_effect(int opcode, int oparg)
return -1;
case DELETE_GLOBAL:
return 0;
case DUP_TOPX:
return oparg;
case LOAD_CONST:
return 1;
case LOAD_NAME:
@ -3404,7 +3402,7 @@ compiler_handle_subscr(struct compiler *c, const char *kind,
return 0;
}
if (ctx == AugLoad) {
ADDOP_I(c, DUP_TOPX, 2);
ADDOP(c, DUP_TOP_TWO);
}
else if (ctx == AugStore) {
ADDOP(c, ROT_THREE);