[Bug tree-optimization/67815] Optimize const1 * copysign (const2, y) into copysign (const1 * const2, y) if const1 > 0 or -copysign (const1 * const2, y) if const1 < 0

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67815

--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Wed Oct 14 12:54:03 2015
New Revision: 228809

URL: https://gcc.gnu.org/viewcvs?rev=228809&root=gcc&view=rev
Log:
        PR tree-optimization/67815
        * tree-ssa-reassoc.c (attempt_builtin_copysign): New function.
        (reassociate_bb): Call it.

        * gcc.dg/tree-ssa/reassoc-39.c: New test.
        * gcc.dg/tree-ssa/reassoc-40.c: New test.
        * gcc.dg/tree-ssa/reassoc-41.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/reassoc-39.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/reassoc-40.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/reassoc-41.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-reassoc.c