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/Python/compile.c b/Python/compile.c
index aae0339..6963a15 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -680,8 +680,8 @@
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 @@
return -1;
case DELETE_GLOBAL:
return 0;
- case DUP_TOPX:
- return oparg;
case LOAD_CONST:
return 1;
case LOAD_NAME:
@@ -3404,7 +3402,7 @@
return 0;
}
if (ctx == AugLoad) {
- ADDOP_I(c, DUP_TOPX, 2);
+ ADDOP(c, DUP_TOP_TWO);
}
else if (ctx == AugStore) {
ADDOP(c, ROT_THREE);