[Bug middle-end/79665] gcc's signed (x*x)/200 is slower than clang's

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79665

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Feb 23 07:49:06 2017
New Revision: 245676

URL: https://gcc.gnu.org/viewcvs?rev=245676&root=gcc&view=rev
Log:
        PR middle-end/79665
        * internal-fn.c (get_range_pos_neg): Moved to ...
        * tree.c (get_range_pos_neg): ... here.  No longer static.
        * tree.h (get_range_pos_neg): New prototype.
        * expr.c (expand_expr_real_2) <case TRUNC_DIV_EXPR>: If both arguments
        are known to be in between 0 and signed maximum inclusive, try to
        expand both unsigned and signed divmod and use the cheaper one from
        those.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/expr.c
    trunk/gcc/internal-fn.c
    trunk/gcc/tree.c
    trunk/gcc/tree.h