[Bug middle-end/52134] Does not fold (x * 4) & -4

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52134

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-13 
13:47:43 UTC ---
Author: rguenth
Date: Tue Mar 13 13:47:35 2012
New Revision: 185334

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185334
Log:
2012-03-13  Richard Guenther  <rguent...@suse.de>

    PR middle-end/52134
    * fold-const.c (fold_binary_loc): Fold (X * Y) & -(1 << CST) to X * Y
    if Y is a constant multiple of 1 << CST.

    * gcc.dg/pr52134.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/pr52134.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog