[Bug middle-end/77436] [5/6/7 Regression] Incorrect constant result for summing loop inserted

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77436

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Sep  1 13:38:25 2016
New Revision: 239937

URL: https://gcc.gnu.org/viewcvs?rev=239937&root=gcc&view=rev
Log:
2016-09-01  Richard Biener  <rguenther@suse.de>

        PR middle-end/77436
        * tree-chrec.c (tree_fold_binomial): Use widest_int, properly
        check whether the result fits the desired result type.

        * gcc.dg/torture/pr77436.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr77436.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-chrec.c