[Bug tree-optimization/54295] [4.7 regression] Widening multiply-accumulate operation uses wrong value extension

[rearnsha at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54295

--- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> 2012-08-17 
12:50:32 UTC ---
Testing a fix