https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70687
--- Comment #4 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> --- Author: rsandifo Date: Tue May 3 10:29:55 2016 New Revision: 235811 URL: https://gcc.gnu.org/viewcvs?rev=235811&root=gcc&view=rev Log: PR 70687: Use wide_int in combine.c:change_zero_ext PR 70687 reports a case where combine.c mishandles integer modes wider than unsigned HOST_WIDE_INT. I don't have a testcase since the PR is just pointing out the hole. Also, I think a ZERO_EXTEND of a vector mode could in principle satisfy the subreg condition but wouldn't be equivalent to an AND. E.g.: (zero_extend:V4DI (subreg:V4SI (reg:V4DI R) 0)) Tested on x86_64-linux-gnu. gcc/ PR rtl-optimization/70687 * combine.c (change_zero_ext): Check for scalar modes. Use wide_int instead of unsigned HOST_WIDE_INT. Modified: trunk/gcc/ChangeLog trunk/gcc/combine.c
