Mercurial > cpython-lru_cache-weakref

diff Python/ceval.c @ 31618:bc006682acb2 legacy-trunk

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SF patch #910929: Optimize list comprehensions Add a new opcode, LIST_APPEND, and apply it to the code generation for list comprehensions. Reduces the per-loop overhead by about a third.
author Raymond Hettinger <python@rcn.com>
date Sun, 07 Mar 2004 07:31:06 +0000
parents fd2103ae6f29
children b4e4dbd24fe7
line wrap: on
line diff
--- a/Python/ceval.c	Fri Mar 05 14:33:21 2004 +0000
+++ b/Python/ceval.c	Sun Mar 07 07:31:06 2004 +0000
@@ -1225,6 +1225,15 @@
 			if (x != NULL) continue;
 			break;
 
+		case LIST_APPEND:
+			w = POP();
+			v = POP();
+			err = PyList_Append(v, w);
+			Py_DECREF(v);
+			Py_DECREF(w);
+			if (err == 0) continue;
+			break;
+
 		case INPLACE_POWER:
 			w = POP();
 			v = TOP();