Hi,
the following patch tries to fix the LOAD_CONST POP_TOP optimization
lost in 2.5 (bug #1333982).
An example for this is:
def f():
'a' # docstring
'b'
Georg
PS: Hmm. While looking, I see that 2.4 doesn't optimize away other constants
like
def g():
1
Index: Python/compile.c
===================================================================
--- Python/compile.c (Revision 47150)
+++ Python/compile.c (Arbeitskopie)
@@ -775,10 +775,16 @@
}
break;
+ case LOAD_CONST:
+ cumlc = lastlc + 1;
+ /* Skip over LOAD_CONST POP_TOP */
+ if (codestr[i+3] == POP_TOP) {
+ memset(codestr+i, NOP, 4);
+ cumlc = 0;
+ break;
+ }
/* Skip over LOAD_CONST trueconst
JUMP_IF_FALSE xx POP_TOP */
- case LOAD_CONST:
- cumlc = lastlc + 1;
j = GETARG(codestr, i);
if (codestr[i+3] != JUMP_IF_FALSE ||
codestr[i+6] != POP_TOP ||
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