[pypy-svn] r77404 - pypy/extradoc/planning

arigo at codespeak.net arigo at codespeak.net
Mon Sep 27 13:43:54 CEST 2010

Author: arigo
Date: Mon Sep 27 13:43:53 2010
New Revision: 77404

Add a comment.

Modified: pypy/extradoc/planning/jit.txt
--- pypy/extradoc/planning/jit.txt	(original)
+++ pypy/extradoc/planning/jit.txt	Mon Sep 27 13:43:53 2010
@@ -92,6 +92,8 @@
 - think out looking into functions or not, based on arguments,
   for example contains__Tuple should be unrolled if tuple is of constant
   length. HARD, blocked by the fact that we don't know constants soon enough
+  Also, an unrolled loop means several copies of the guards, which may
+  fail independently, leading to an exponential number of bridges
 - out-of-line guards (when an external change would invalidate existing
   pieces of assembler)

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