Speed-up dictionary constructor by about 10%.
New opcode, STORE_MAP saves the compiler from awkward stack manipulations
and specializes for dicts using PyDict_SetItem instead of PyObject_SetItem.
Old disassembly:
0 BUILD_MAP 0
3 DUP_TOP
4 LOAD_CONST 1 (1)
7 ROT_TWO
8 LOAD_CONST 2 ('x')
11 STORE_SUBSCR
12 DUP_TOP
13 LOAD_CONST 3 (2)
16 ROT_TWO
17 LOAD_CONST 4 ('y')
20 STORE_SUBSCR
New disassembly:
0 BUILD_MAP 0
3 LOAD_CONST 1 (1)
6 LOAD_CONST 2 ('x')
9 STORE_MAP
10 LOAD_CONST 3 (2)
13 LOAD_CONST 4 ('y')
16 STORE_MAP
diff --git a/Include/opcode.h b/Include/opcode.h
index 2816369..9f20b56 100644
--- a/Include/opcode.h
+++ b/Include/opcode.h
@@ -45,6 +45,7 @@
#define DELETE_SLICE 50
/* Also uses 51-53 */
+#define STORE_MAP 54
#define INPLACE_ADD 55
#define INPLACE_SUBTRACT 56
#define INPLACE_MULTIPLY 57