[Bug c++/71537] GCC rejects consetxpr boolean conversions and comparisons on the result of pointer arithmetic.

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71537

--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Dec  6 09:23:51 2016
New Revision: 243285

URL: https://gcc.gnu.org/viewcvs?rev=243285&root=gcc&view=rev
Log:
2016-12-06  Jakub Jelinek  <ja...@redhat.com>

        PR c++/71537
        * fold-const-call.c (fold_const_call_1): Remove memchr handling here.
        (fold_const_call) <case CFN_BUILT_IN_STRNCMP,
        case CFN_BUILT_IN_STRNCASECMP>: Formatting improvements.
        (fold_const_call) <case CFN_BUILT_IN_MEMCMP>: Likewise.  If s2 is 0
        and arguments have no side-effects, return 0.
        (fold_const_call): Handle CFN_BUILT_IN_MEMCHR.

        * g++.dg/cpp0x/constexpr-memchr.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-memchr.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const-call.c
    trunk/gcc/testsuite/ChangeLog