[Bug c/46076] [4.6 regression] constant propagation and compile-time math no longer happening versus 4.4 and 4.5

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46076

--- Comment #21 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-01-14 
12:39:14 UTC ---
Author: rguenth
Date: Fri Jan 14 12:39:09 2011
New Revision: 168781

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=168781
Log:
2011-01-14  Richard Guenther  <rguent...@suse.de>

    PR middle-end/47281
    Revert
    2011-01-11  Richard Guenther  <rguent...@suse.de>

        PR tree-optimization/46076
        * tree-ssa.c (useless_type_conversion_p): Conversions from
        unprototyped to empty argument list function types are useless.

    * gcc.dg/torture/pr47281.c: New testcase.
    * gcc.dg/tree-ssa/pr46076.c: XFAIL.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr47281.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr46076.c
    trunk/gcc/tree-ssa.c