------- Comment #32 from rguenth at gcc dot gnu dot org 2008-10-04 00:57
-------
As we PHI-translate k_1 * 4 we are not able to find D.1237_7 * 4 in the
SCCVN tables. So we allocate a new value-id for it. Oops. This is because
once we say its type is unsigned int and once it's unsigned long. And
we require types to be pointer-equal in the hash comparison fn.
I have a patch to fix this which makes this run even more slow. -fno-tree-pre
fixes the speed regression.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[4.2/4.3/4.4 Regression] |[4.2/4.3/4.4 Regression]
|missed load PRE |missed load PRE, PRE makes
| |i?86 suck
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21485
