diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2018-01-15 10:05:59 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2018-01-15 10:05:59 +0100 |
| commit | 3fccbb9ecec7daa3b6468f72379c0bd1fb5bb8d9 (patch) | |
| tree | 08c17fa7abe77e42e46b0fdf6d49c9bdf48fc9a0 /gcc/tree.h | |
| parent | 2aa89839f557b7467704ddffa4dc43a130e8d027 (diff) | |
re PR middle-end/82694 (Linux kernel miscompiled since r250765)
PR middle-end/82694
* common.opt (fstrict-overflow): No longer an alias.
(fwrapv-pointer): New option.
* tree.h (TYPE_OVERFLOW_WRAPS, TYPE_OVERFLOW_UNDEFINED): Define
also for pointer types based on flag_wrapv_pointer.
* opts.c (common_handle_option) <case OPT_fstrict_overflow>: Set
opts->x_flag_wrap[pv] to !value, clear opts->x_flag_trapv if
opts->x_flag_wrapv got set.
* fold-const.c (fold_comparison, fold_binary_loc): Revert 2017-08-01
changes, just use TYPE_OVERFLOW_UNDEFINED on pointer type instead of
POINTER_TYPE_OVERFLOW_UNDEFINED.
* match.pd: Likewise in address comparison pattern.
* doc/invoke.texi: Document -fwrapv and -fstrict-overflow.
* gcc.dg/no-strict-overflow-7.c: Revert 2017-08-01 changes.
* gcc.dg/tree-ssa/pr81388-1.c: Likewise.
From-SVN: r256686
Diffstat (limited to 'gcc/tree.h')
| -rw-r--r-- | gcc/tree.h | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/gcc/tree.h b/gcc/tree.h index f47e2338d2d..af8a6fb380c 100644 --- a/gcc/tree.h +++ b/gcc/tree.h @@ -829,13 +829,16 @@ extern void omp_clause_range_check_failed (const_tree, const char *, int, /* Same as TYPE_UNSIGNED but converted to SIGNOP. */ #define TYPE_SIGN(NODE) ((signop) TYPE_UNSIGNED (NODE)) -/* True if overflow wraps around for the given integral type. That +/* True if overflow wraps around for the given integral or pointer type. That is, TYPE_MAX + 1 == TYPE_MIN. */ #define TYPE_OVERFLOW_WRAPS(TYPE) \ - (ANY_INTEGRAL_TYPE_CHECK(TYPE)->base.u.bits.unsigned_flag || flag_wrapv) + (POINTER_TYPE_P (TYPE) \ + ? flag_wrapv_pointer \ + : (ANY_INTEGRAL_TYPE_CHECK(TYPE)->base.u.bits.unsigned_flag \ + || flag_wrapv)) -/* True if overflow is undefined for the given integral type. We may - optimize on the assumption that values in the type never overflow. +/* True if overflow is undefined for the given integral or pointer type. + We may optimize on the assumption that values in the type never overflow. IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED must issue a warning based on warn_strict_overflow. In some cases @@ -843,8 +846,10 @@ extern void omp_clause_range_check_failed (const_tree, const char *, int, other cases it will be appropriate to simply set a flag and let the caller decide whether a warning is appropriate or not. */ #define TYPE_OVERFLOW_UNDEFINED(TYPE) \ - (!ANY_INTEGRAL_TYPE_CHECK(TYPE)->base.u.bits.unsigned_flag \ - && !flag_wrapv && !flag_trapv) + (POINTER_TYPE_P (TYPE) \ + ? !flag_wrapv_pointer \ + : (!ANY_INTEGRAL_TYPE_CHECK(TYPE)->base.u.bits.unsigned_flag \ + && !flag_wrapv && !flag_trapv)) /* True if overflow for the given integral type should issue a trap. */ |