[Bug tree-optimization/49642] constant part of a macro not optimized away as expected due to splitter

[wschmidt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49642

--- Comment #7 from William J. Schmidt <wschmidt at gcc dot gnu.org> 2012-01-09 
21:57:57 UTC ---
I should note that the problem still persists in 4.7 when -fno-tree-fre is
specified.

For 4.6, I am working on a solution along the lines Richi outlined above.  We
may want to consider putting that in 4.7 as well for the -fno-tree-fre case.