[Bug middle-end/68046] -ftrapv doesn't catch leaq-based overflows on x86-64

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68046

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Oct 22 11:44:11 2015
New Revision: 229170

URL: https://gcc.gnu.org/viewcvs?rev=229170&root=gcc&view=rev
Log:
2015-10-22  Richard Biener  <rguent...@suse.de>

        PR middle-end/68046
        PR middle-end/61893
        * optabs.c (emit_libcall_block_1): Allow a NULL_RTX equiv.
        (expand_binop): For -ftrapv optabs do not record an REG_EQUAL note.
        (expand_unop): Likewise.

        * gcc.dg/torture/ftrapv-2.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/ftrapv-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/optabs.c
    trunk/gcc/testsuite/ChangeLog