[Bug tree-optimization/91750] Induction vectorization introduces signed overflows

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91750

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Sep 12 12:48:43 2019
New Revision: 275685

URL: https://gcc.gnu.org/viewcvs?rev=275685&root=gcc&view=rev
Log:
2019-09-12  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/91750
        * tree-vect-loop.c (vectorizable_induction): Compute IV increments
        in the type of the evolution.

        * gcc.dg/vect/pr91750.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/vect/pr91750.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-loop.c