[Bug middle-end/53144] [4.7/4.8 Regression] PPRE infinite loop

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53144

--- Comment #7 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-05-02 
12:17:48 UTC ---
We are repeatedly inserting

Inserted pretmp.34_83 = MEM[(unsigned char *)&uc0];
 in predecessor 2

causing insert iteration.  Reproduces with -fno-tree-partial-pre, too, so a
regular PRE issue.