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.
diff --git a/Lib/opcode.py b/Lib/opcode.py
index e8cccc3..9833b6c 100644
--- a/Lib/opcode.py
+++ b/Lib/opcode.py
@@ -48,7 +48,7 @@
def_op('ROT_TWO', 2)
def_op('ROT_THREE', 3)
def_op('DUP_TOP', 4)
-def_op('ROT_FOUR', 5)
+def_op('DUP_TOP_TWO', 5)
def_op('NOP', 9)
def_op('UNARY_POSITIVE', 10)
@@ -116,7 +116,6 @@
name_op('DELETE_ATTR', 96) # ""
name_op('STORE_GLOBAL', 97) # ""
name_op('DELETE_GLOBAL', 98) # ""
-def_op('DUP_TOPX', 99) # number of items to duplicate
def_op('LOAD_CONST', 100) # Index in const list
hasconst.append(100)
name_op('LOAD_NAME', 101) # Index in name list