[Bug middle-end/62263] Good codegen for bitwise rotate requires code that is technically undefined behavior

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62263

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sat Oct 14 18:48:38 2017
New Revision: 253761

URL: https://gcc.gnu.org/viewcvs?rev=253761&root=gcc&view=rev
Log:
        PR middle-end/62263
        PR middle-end/82498
        * tree-ssa-phiopt.c (value_replacement): Comment fix.  Handle
        up to 2 preparation statements for ASSIGN in MIDDLE_BB.

        * c-c++-common/rotate-8.c: Expect no PHIs in optimized dump.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/c-c++-common/rotate-8.c
    trunk/gcc/tree-ssa-phiopt.c