[Bug tree-optimization/54295] [4.7/4.8 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 #3 from Richard Earnshaw <rearnsha at gcc dot gnu.org> 2012-08-20 
12:49:55 UTC ---
Author: rearnsha
Date: Mon Aug 20 12:49:47 2012
New Revision: 190533

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=190533
Log:
    PR tree-ssa/54295
    * tree-ssa-math-opts.c (widening_mult_conversion_strippable_p):
    New function.
    (is_widening_mult_rhs_p): Use it.

    * gcc.c-torture/execute/20120817-1.c: New test.


Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/20120817-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-math-opts.c