PowerPC: Adjust float128/ibm128 warnings.

This patch ccombines two patches:

1) If GLIBC is 2.32 or newer, and the language is C or C++, allow the user to
   change the long double type without having to use -Wno-psabi.

2) Adjust the warnings for intermixing __float128 and __ibm128 to accomidate
   the future change to allow long double to use the IEEE 128-bit format.

gcc/
2020-10-29  Michael Meissner  <meissner@linux.ibm.com>

* config/rs6000/rs6000.c (rs6000_option_override_internal): Allow
long double type to be changed for C/C++ if glibc 2.32 or newer.
(rs6000_invalid_binary_op): Update error messages about mixing IBM
long double and IEEE 128-bit.

gcc/testsuite/
2020-10-27  Michael Meissner  <meissner@linux.ibm.com>

* gcc.target/powerpc/float128-mix-2.c: New test.
* gcc.target/powerpc/float128-mix-3.c: New test.
* gcc.target/powerpc/float128-mix.c: Update failure messages.

libstdc++: AIX xfail for_overwrite.cc testcase

The 20_util/unique_ptr/creation/for_overwrite.cc testcase relies on
operator new, which requires special features on AIX.  This patch
disables the testcase.

libstdc++-v3/ChangeLog:

* testsuite/20_util/unique_ptr/creation/for_overwrite.cc: XFAIL on AIX.

Daily bump.

libstdc++: Fix linker script to remove conflicting patterns

This should fix a bootstrap error on Solaris, due to some of the new
symbols matching old patterns as well as new ones.

libstdc++-v3/ChangeLog:

* config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Tighten patterns
for old <sstream> symbols some more.

libstdc++: Avoid narrowing conversion in subrange constructor

libstdc++-v3/ChangeLog:

* include/bits/ranges_util.h (subrange::subrange(R&&)): Use
direct-initialization instead of list-initialization, so a
potential narrowing conversion from ranges::size(r) to the
stored size isn't ill-formed.

libstdc++: Fix some warnings in headers

These are usually suppressed in system headers, but should be fixed
anyway.

libstdc++-v3/ChangeLog:

* include/bits/parse_numbers.h (_Select_int_base): Avoid
narrowing conversion in constant expression.
* include/experimental/buffer (buffer_copy): Avoid narrowing
conversion.
* include/experimental/internet (hash<>::operator()): Do not
use deprecated 'argument_type' member.
* include/std/variant (variant::emplace): Use cast instead
of implicit conversion from size_t to narrower unsigned type.

libstdc++: Prevent deprecation warnings from <tr1/shared_ptr>

libstdc++-v3/ChangeLog:

* include/tr1/shared_ptr.h (__shared_count, __shared_ptr)
(shared_ptr): Add diagnostic pragmas around uses of auto_ptr.
* testsuite/tr1/2_general_utilities/shared_ptr/cons/43820_neg.cc:
Adust dg-error line numbers.

libstdc++: Avoid warnings in tests

This fixes some warnings emitted when testing with warning flags added.
Some of these are only necessary when testing with -Wsystem-headers, but
either way it cleans up the tests to be less noisy under non-default
flags.

libstdc++-v3/ChangeLog:

* testsuite/18_support/96817.cc: Avoid -Wunused warnings.
* testsuite/20_util/any/assign/2.cc: Likewise.
* testsuite/20_util/any/cons/2.cc: Likewise.
* testsuite/20_util/align/1.cc: Avoid -Wsign-compare warning.
* testsuite/20_util/function/65760.cc: Avoid -Wunused warning.
* testsuite/20_util/function/1.cc: Avoid -Wcatch-value warning.
* testsuite/20_util/function/cons/move_target.cc: Avoid -Wunused
warning.
* testsuite/20_util/headers/memory/synopsis.cc: Add exception
specification.
* testsuite/20_util/monotonic_buffer_resource/allocate.cc: Avoid
-Wsign-compare warning.
* testsuite/20_util/tuple/cons/deduction.cc: Avoid -Wunused
warning.
* testsuite/20_util/specialized_algorithms/uninitialized_copy/808590-cxx11.cc:
Avoid -Wdeprecated-copy warning.
* testsuite/21_strings/basic_string/56166.cc: Avoid
-Wcatch-value warning.
* testsuite/21_strings/basic_string/numeric_conversions/char/stod.cc:
Avoid -Wcatch-value warnings.
* testsuite/21_strings/basic_string/numeric_conversions/char/stof.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/char/stoi.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/char/stol.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/char/stold.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/char/stoll.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/char/stoul.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/char/stoull.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stod.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stof.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoi.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stol.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stold.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoll.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoul.cc:
Likewise.
* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoull.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/compare/char/nonnull.cc:
Prune additional diagnostics.
* testsuite/21_strings/basic_string_view/operations/find/char/nonnull.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/rfind/char/nonnull.cc:
Likewise.
* testsuite/21_strings/headers/string/synopsis.cc: Add exception
specifications.
* testsuite/22_locale/locale/cons/12352.cc: Define sized
delete operators to avoid warnings.
* testsuite/23_containers/deque/modifiers/swap/1.cc: Add
exception specification.
* testsuite/23_containers/forward_list/cons/11.cc: Avoid
-Wdeprecated-copy warning.
* testsuite/23_containers/headers/bitset/synopsis.cc: Add
exception specification.
* testsuite/23_containers/headers/deque/synopsis.cc: Likewise.
* testsuite/23_containers/headers/forward_list/synopsis.cc:
Likewise.
* testsuite/23_containers/headers/list/synopsis.cc: Likewise.
* testsuite/23_containers/headers/map/synopsis.cc: Likewise.
* testsuite/23_containers/headers/queue/synopsis.cc: Likewise.
* testsuite/23_containers/headers/set/synopsis.cc: Likewise.
* testsuite/23_containers/headers/vector/synopsis.cc: Likewise.
* testsuite/23_containers/list/modifiers/swap/1.cc: Likewise.
* testsuite/23_containers/map/modifiers/swap/1.cc: Likewise.
* testsuite/23_containers/multimap/modifiers/swap/1.cc:
Likewise.
* testsuite/23_containers/multiset/modifiers/swap/1.cc:
Likewise.
* testsuite/23_containers/set/modifiers/swap/1.cc: Likewise.
* testsuite/23_containers/unordered_set/56267-2.cc: Avoid
-Wdeprecated-copy warning.
* testsuite/23_containers/vector/bool/23632.cc: Avoid
-Wempty-body warning.
* testsuite/23_containers/vector/modifiers/swap/1.cc: Add
exception specification.
* testsuite/25_algorithms/heap/moveable2.cc: Fix misplaced
parentheses around arguments.
* testsuite/25_algorithms/sample/1.cc: Use return value.
* testsuite/25_algorithms/search/searcher.cc: Avoid -Wunused
warnings.
* testsuite/27_io/basic_ostream/exceptions/char/9561.cc:
Likewise.
* testsuite/27_io/basic_ostream/exceptions/wchar_t/9561.cc:
Likewise.
* testsuite/27_io/filesystem/operations/remove_all.cc: Avoid
-Wsign-compare warning.
* testsuite/experimental/any/assign/2.cc: Avoid -Wunused warnings.
* testsuite/experimental/any/cons/2.cc: Likewise.
* testsuite/experimental/filesystem/operations/remove_all.cc:
Avoid -Wign-compare warning.
* testsuite/experimental/memory/observer_ptr/cons/cons.cc:
Likewise.
* testsuite/experimental/memory_resource/null_memory_resource.cc:
Likewise.
* testsuite/experimental/source_location/1.cc: Avoid -Waddress
warning.
* testsuite/ext/pod_char_traits.cc: Avoid -Wunused warning.
* testsuite/ext/vstring/modifiers/clear/56166.cc: Avoid
-Wcatch-value.
* testsuite/std/concepts/concepts.lang/concept.swappable/swap.cc:
Avoid -Wunused warning.
* testsuite/std/concepts/concepts.lang/concept.swappable/swappable.cc:
Likewise.
* testsuite/tr1/2_general_utilities/shared_ptr/cons/43820_neg.cc:
Prune additional warnings.
* testsuite/tr1/3_function_objects/function/1.cc: Avoid
-Wcatch-value warning.
* testsuite/util/replacement_memory_operators.h: Define sized
delete to avoid warnings.
* testsuite/util/testsuite_api.h (_NonDefaultConstructible): Add
user-declared assignment operator to stop -Wdeprecated-copy
warnings.
* testsuite/util/testsuite_containers.h: Avoid -Wunused warning.
* testsuite/util/testsuite_iterators.h: Avoid -Wsign-compare
warnings.
* testsuite/util/testsuite_new_operators.h: Define sized deleted.

c++: Implement CWG 625: Use of auto as template-arg [PR97479]

This patch implements CWG 625 which prohibits using auto in a template
argument.  A few tests used this construction.  Since this usage was
allowed by the Concepts TS, we only give an error in C++20.

gcc/cp/ChangeLog:

DR 625
PR c++/97479
* parser.c (cp_parser_type_id_1): Reject using auto as
a template-argument in C++20.

gcc/testsuite/ChangeLog:

DR 625
PR c++/97479
* g++.dg/cpp0x/auto3.C: Update dg-error.
* g++.dg/cpp0x/auto9.C: Likewise.
* g++.dg/cpp2a/concepts-pr84979-2.C: Likewise.
* g++.dg/cpp2a/concepts-pr84979-3.C: Likewise.
* g++.dg/cpp2a/concepts-pr84979.C: Likewise.
* g++.dg/DRs/dr625.C: New test.

Replace free with XDELETE.

gcc/c/ChangeLog:

* c-typeck.c (free_all_tagged_tu_seen_up_to): Replace free
with XDELETE.
(finish_init): Likewise.
(pop_init_level): Likewise.

c++: Deducing type from initializer_list<auto> [PR93107]

In this testcase we weren't able to deduce b's type:

  template<typename T> void Task() { }
  auto b = { &Task<int> };

because resolve_nondeduced_context doesn't iterate on the {}'s elements.
So make sure to look into {} too.  We don't need to handle nested {}
here.

We could either tweak resolve_nondeduced_context to handle CONSTRUCTORs
or add a _ctor version, but then resolve_nondeduced_context_or_error
would need some changes too -- it'd have to check the result of a call
to r_n_c for each element.

gcc/cp/ChangeLog:

PR c++/93107
* pt.c (do_auto_deduction): Call resolve_nondeduced_context for
the elements of a { } list.

gcc/testsuite/ChangeLog:

PR c++/93107
* g++.dg/cpp0x/initlist-deduce3.C: New test.

c++: Reject float <=> enum.

As [depr.arith.conv.enum] says, these are ill-formed.

gcc/cp/ChangeLog:

* typeck.c (do_warn_enum_conversions): Don't warn for SPACESHIP_EXPR.
(cp_build_binary_op): Reject float <=> enum or enum <=> float.  Use
CP_INTEGRAL_TYPE_P instead of INTEGRAL_OR_ENUMERATION_TYPE_P.

gcc/testsuite/ChangeLog:

* g++.dg/cpp2a/enum-conv1.C: Remove unused code.
* g++.dg/cpp2a/spaceship-err5.C: New test.

c++: Simplify constraint normalization routines

Many of the high-level constraint normalization routines allow the
caller to supply the initial template arguments for normalization, but
in practice all of the callers supply something equivalent to the
identity mapping(*).

This patch hard-codes this prevalent choice of initial template
arguments by making get_normalized_constraints always pass NULL_TREE as
the args to normalize_expression.  This admits some simplifications in
the high-level routines, such as removing their 'args' parameter and
consolidating the two versions of normalize_constraint_expression.

(*): In particular, a set of generic template arguments or NULL_TREE.
In the case of the two-parm version of normalize_constraint_expression,
we were suspiciously using the template arguments of a concept-id when
normalizing the concept-id as a constraint-expression.

gcc/cp/ChangeLog:

* constraint.cc (get_normalized_constraints): Remove 'args'
parameter.  Pass NULL_TREE as the initial template arguments to
normalize_expression.
(get_normalized_constraints_from_info): Remove 'args' parameter
and adjust the call to get_normalized_constraints.
(get_normalized_constraints_from_decl): Remove 'args' local
variable and adjust call to get_normalized_constraints_from_info.
(normalize_concept_definition): Remove 'args' local variable
and adjust call to get_normalized_constraints.
(normalize_constraint_expression): Remove the two-parameter
overload.  Remove 'args' parameter from the three-parameter
overload and update function comment accordingly.  Remove
default argument from 'diag' parameter.  Adjust call to
get_normalized_constraints.
(finish_nested_requirement): Adjust call to
normalize_constraint_expression.
(strictly_subsumes): Remove 'args' parameter.  Adjust call to
get_normalized_constraints_from_info.
(weakly_subsumes): Likewise.
* cp-tree.h (strictly_subsumes): Remove 'args' parameter.
(weakly_subsumes): Likewise.
* pt.c (process_partial_specialization): Adjust call to
strictly_subsumes.
(is_compatible_template_arg): Adjust call to weakly_subsumes.

c++: Tolerate empty initial args during normalization [PR97412]

When normalizing the constraint-expression of a nested-requirement, we
pass NULL_TREE as the initial template arguments for normalization, but
tsubst_argument_pack is not prepared to handle a NULL_TREE args vector.
This causes us to ICE when normalizing a variadic concept as part of a
nested-requirement.

This patch fixes the ICE by guarding the call to tsubst_template_args in
normalize_concept_check appropriately.  This will also enable us to
simplify many of the normalization routines to just pass NULL_TREE
(instead of a set of generic template arguments) as the initial template
arguments.

gcc/cp/ChangeLog:

PR c++/97412
* constraint.cc (normalize_concept_check): Don't call
tsubst_template_args when 'args' is NULL.

gcc/testsuite/ChangeLog:

PR c++/97412
* g++.dg/cpp2a/concepts-variadic2.C: New test.

Fix some memleaks

This fixes some memleaks, one older, one recently introduced.

2020-10-29  Richard Biener  <rguenther@suse.de>

* tree-ssa-pre.c (compute_avail): Free operands consistently.
* tree-vect-loop.c (vectorizable_phi): Make sure all operand
defs vectors are released.

c++: Fix constexpr cleanup error handling.

In this testcase, the primary evaluation successfully produces 'true', and
then running one of the cleanups hits a double delete, making the whole
thing not a valid constant expression.  So we were returning 'true' wrapped
in a NOP_EXPR to indicate its non-constancy, but evaluating that again is a
perfectly acceptable constant expression, so we weren't getting the verbose
diagnostic we were looking for.

So if non_constant_p gets set other than for overflow, go back to the
original expression.

With this change, we should never hit the manifestly_const_eval test, and
the is-constant-evaluated1.C test passes without it.

gcc/cp/ChangeLog:

PR c++/97388
* constexpr.c (cxx_eval_outermost_constant_expr): Revert to
original expression if evaluation sets non_constant_p.

gcc/testsuite/ChangeLog:

PR c++/97388
* g++.dg/cpp2a/constexpr-dtor8.C: New test.

c++: Fix constexpr dtors vs invisible ref [PR97388]

For arguments passed by invisible reference, in the IL until genericization
we have the source types on the callee side and while on the caller side
we already pass references to the actual argument slot in the caller, we
undo that in cxx_bind_parameters_in_call's
      if (TREE_ADDRESSABLE (type))
        /* Undo convert_for_arg_passing work here.  */
        x = convert_from_reference (x);
This works fine most of the time, except when the type also has constexpr
destructor; in that case the destructor is invoked in the caller and thus
the unsharing we do to make sure that the callee doesn't modify caller's
values is in that case undesirable, it prevents the changes done in the
callee propagating to the caller which should see them for the constexpr
dtor evaluation.

The following patch fixes that.  While it could be perhaps done for all
TREE_ADDRESSABLE types, I don't see the need to change the behavior
if there is no constexpr non-trivial dtor.

Jason: And we need to avoid memoizing the call, because a later equivalent
call also needs to modify its argument.  And we don't need to unshare
constructors when we aren't memoizing the call, because we already unshared
them when evaluating the TARGET_EXPR representing the copy-initialization of
the argument.

2020-10-20  Jakub Jelinek  <jakub@redhat.com>
    Jason Merrill  <jason@redhat.com>

PR c++/97388
* constexpr.c (cxx_bind_parameters_in_call): Set non_constant_args
if the parameter type has a non-trivial destructor.
(cxx_eval_call_expression): Only unshare arguments if we're
memoizing this evaluation.

* g++.dg/cpp2a/constexpr-dtor5.C: New test.
* g++.dg/cpp2a/constexpr-dtor6.C: New test.
* g++.dg/cpp2a/constexpr-dtor7.C: New test.

Annotate vec::copy better for mem stats

* vec.h (vec<T, va_heap, vl_ptr>::copy): Pass mem stat info.

Avoid typeless storage in wide-int

* wide-int.h (trailing_wide_ints <N>): Turn len to array of structures
so it does not imply typeless storage.
(trailing_wide_ints <N>::operator): update
(trailing_wide_ints <N>::operator []): Update.

c++: Diagnose constexpr delete [] new int; and delete new int[N]; [PR95808]

This patch diagnoses delete [] new int; and delete new int[1]; in constexpr
contexts by remembering
IDENTIFIER_OVL_OP_FLAGS (DECL_NAME (fun)) & OVL_OP_FLAG_VEC
from the operator new and checking it at operator delete time.

2020-10-29  Jakub Jelinek  <jakub@redhat.com>

PR c++/95808
* cp-tree.h (enum cp_tree_index): Add CPTI_HEAP_VEC_UNINIT_IDENTIFIER
and CPTI_HEAP_VEC_IDENTIFIER.
(heap_vec_uninit_identifier, heap_vec_identifier): Define.
* decl.c (initialize_predefined_identifiers): Initialize those
identifiers.
* constexpr.c (cxx_eval_call_expression): Reject array allocations
deallocated with non-array deallocation or non-array allocations
deallocated with array deallocation.
(non_const_var_error): Handle heap_vec_uninit_identifier and
heap_vec_identifier too.
(cxx_eval_constant_expression): Handle also heap_vec_uninit_identifier
and in that case during initialization replace it with
heap_vec_identifier.
(find_heap_var_refs): Handle heap_vec_uninit_identifier and
heap_vec_identifier too.

* g++.dg/cpp2a/constexpr-new15.C: New test.

stdbool.h: Update true and false expansions for C2x

C2x has changed the expansions of the true and false macros in
<stdbool.h> so that they have type _Bool (including in #if conditions,
i.e. an unsigned type in that context).  Use the new expansions in
GCC's <stdbool.h> for C2x.

See bug 82272 for related discussion (but this patch does *not*
implement the warning discussed there).

Note that it's possible there may be a further change to make bool,
true and false keywords (there was support in principle for that at
the April WG14 meeting).  But currently these expansions of type _Bool
are what C2x requires and there isn't actually a paper before WG14 at
present that would introduce the new keywords.

Bootstrapped with no regressions on x86_64-pc-linux-gnu.

gcc/
2020-10-29  Joseph Myers  <joseph@codesourcery.com>

* ginclude/stdbool.h [__STDC_VERSION__ > 201710L] (true, false):
Define with type _Bool.

gcc/testsuite/
2020-10-29  Joseph Myers  <joseph@codesourcery.com>

* gcc.dg/c11-bool-1.c, gcc.dg/c2x-bool-1.c, gcc.dg/c99-bool-4.c:
New tests.

libstdc++: Improve tests for constexpr algorithms

These tests just return true without checking that the results of the
algorithms. Although it should be safe to assume that the algorithms
behave the same at compile-time as at run-time, we can use these tests
to verify it.

This replaces each 'return true' statement with a condition that depends
on the basic functionality of the algorithm, such as returning an
iterator to the right position.

libstdc++-v3/ChangeLog:

* testsuite/25_algorithms/all_of/constexpr.cc: Check result of
the algorithm.
* testsuite/25_algorithms/any_of/constexpr.cc: Likewise.
* testsuite/25_algorithms/binary_search/constexpr.cc: Likewise.
* testsuite/25_algorithms/copy_backward/constexpr.cc: Likewise.
* testsuite/25_algorithms/count/constexpr.cc: Likewise.
* testsuite/25_algorithms/equal/constexpr.cc: Likewise.
* testsuite/25_algorithms/equal_range/constexpr.cc: Likewise.
* testsuite/25_algorithms/fill/constexpr.cc: Likewise.
* testsuite/25_algorithms/find_end/constexpr.cc: Likewise.
* testsuite/25_algorithms/find_if/constexpr.cc: Likewise.
* testsuite/25_algorithms/is_partitioned/constexpr.cc: Likewise.
* testsuite/25_algorithms/is_permutation/constexpr.cc: Likewise.
* testsuite/25_algorithms/is_sorted_until/constexpr.cc:
Likewise.
* testsuite/25_algorithms/lexicographical_compare/constexpr.cc:
Likewise.
* testsuite/25_algorithms/lower_bound/constexpr.cc: Likewise.
* testsuite/25_algorithms/merge/constexpr.cc: Likewise.
* testsuite/25_algorithms/mismatch/constexpr.cc: Likewise.
* testsuite/25_algorithms/none_of/constexpr.cc: Likewise.
* testsuite/25_algorithms/partition_copy/constexpr.cc: Likewise.
* testsuite/25_algorithms/remove_copy/constexpr.cc: Likewise.
* testsuite/25_algorithms/remove_copy_if/constexpr.cc: Likewise.
* testsuite/25_algorithms/remove_if/constexpr.cc: Likewise.
* testsuite/25_algorithms/replace_if/constexpr.cc: Likewise.
* testsuite/25_algorithms/reverse/constexpr.cc: Likewise.
* testsuite/25_algorithms/reverse_copy/constexpr.cc: Likewise.
* testsuite/25_algorithms/rotate_copy/constexpr.cc: Likewise.
* testsuite/25_algorithms/search/constexpr.cc: Likewise.
* testsuite/25_algorithms/set_difference/constexpr.cc: Likewise.
* testsuite/25_algorithms/set_intersection/constexpr.cc:
Likewise.
* testsuite/25_algorithms/set_symmetric_difference/constexpr.cc:
Likewise.
* testsuite/25_algorithms/set_union/constexpr.cc: Likewise.
* testsuite/25_algorithms/unique_copy/constexpr.cc: Likewise.
* testsuite/25_algorithms/upper_bound/constexpr.cc: Likewise.

libstdc++: Allow Lemire's algorithm to be used in more cases

This extends the fast path to also work when the URBG's range of
possible values is not the entire range of its result_type. Previously,
the slow path would be used for engines with a uint_fast32_t result type
if that type is actually a typedef for uint64_t rather than uint32_t.
After this change, the generator's result_type is not important, only
the range of possible value that generator can produce. If the
generator's range is exactly UINT64_MAX then the calculation will be
done using 128-bit and 64-bit integers, and if the range is UINT32_MAX
it will be done using 64-bit and 32-bit integers.

In practice, this benefits most of the engines and engine adaptors
defined in [rand.predef] on x86_64-linux and other 64-bit targets. This
is because std::minstd_rand0 and std::mt19937 and others use
uint_fast32_t, which is a typedef for uint64_t.

The code now makes use of the recently-clarified requirement that the
generator's min() and max() functions are usable in constant
expressions (see LWG 2154).

libstdc++-v3/ChangeLog:

* include/bits/uniform_int_dist.h (_Power_of_two): Add
constexpr.
(uniform_int_distribution::_S_nd): Add static_assert to ensure
the wider type is twice as wide as the result type.
(uniform_int_distribution::__generate_impl): Add static_assert
and declare variables as constexpr where appropriate.
(uniform_int_distribution:operator()): Likewise. Only consider
the uniform random bit generator's range of possible results
when deciding whether _S_nd can be used, not the __uctype type.

libstdc++: Do not use volatile for __gnu_cxx::rope reference counting

The rope extension uses a volatile variable for its reference count.
This is not only unnecessary for correctness (volatile provides neither
atomicity nor memory visibility, and the variable is only modified while
a lock is held) but it now causes deprecated warnings with
-Wsystem-headers due to the use of ++ and -- operators.

It would be possible to use __gnu_cxx::__exchange_and_add in _M_incr and
_M_decr when __atomic_is_lock_free(sizeof(_RC_t), &_M_ref_count) is
true, rather than locking a mutex. That would probably be a significant
improvement for multi-threaded and single-threaded code (because
__exchange_and_add will use non-atomic ops when possible, and even in MT
code it should be faster than the mutex lock/unlock pair). However,
mixing objects compiled with the old and new code would result in
inconsistent synchronization being used for the reference count.

libstdc++-v3/ChangeLog:

* include/ext/rope (_Refcount_Base::_M_ref_count): Remove
volatile qualifier.
(_Refcount_Base::_M_decr()): Likewise.

libstdc++: Make std::function work better with -fno-rtti

This change allows std::function::target<F>() to work even without RTTI,
using the same approach as std::any. Because we know what the manager
function would be for a given type, we can check if the stored pointer
has the expected address. If it does, we don't need to use RTTI. If it
isn't equal, we still need to do the RTTI check (when RTTI is enabled)
to handle the case where the same function has different addresses in
different shared objects.

This also changes the implementation of the manager function to return a
null pointer result when asked for the type_info of the target object.
This not only avoids a warning with -Wswitch -Wsystem-headers, but also
avoids prevents std::function::target_type() from dereferencing an
uninitialized pointer when the linker keeps an instantiation of the
manager function that was compiled without RTTI.

Finally, this fixes a bug in the non-const overload of function::target
where calling it with a function type F was ill-formed, due to
attempting to use const_cast<F*>(ptr). The standard only allows
const_cast<T*> when T is an object type.  The solution is to use
*const_cast<F**>(&ptr) instead, because F* is an object type even if F
isn't. I've also used _GLIBCXX17_CONSTEXPR in function::target so that
it doesn't bother instantiating anything for types that can never be a
valid target.

libstdc++-v3/ChangeLog:

* include/bits/std_function.h (_Function_handler<void, void>):
Define explicit specialization used for invalid target types.
(_Base_manager::_M_manager) [!__cpp_rtti]: Return null.
(function::target_type()): Check for null pointer.
(function::target()): Define unconditionall. Fix bug with
const_cast of function pointer type.
(function::target() const): Define unconditionally, but
only use RTTI if enabled.
* testsuite/20_util/function/target_no_rtti.cc: New test.

Selectively trap if ranger and vr-values disagree on range builtins.

The UBSAN builtins degrade into PLUS/MINUS/MULT and call
extract_range_from_binary_expr, which as the PR shows, can special
case some symbolics which the ranger doesn't currently handle.

Looking at vr_values::extract_range_builtin(), I see that every single
place where we ask for a range, we bail on non-integers (symbolics,
etc).  That is, with the exception of the UBSAN builtins.

Since this seems to be particular to UBSAN, we could still go with the
original plan of removing the duplicity in ranger vs vr-values, but
leave in the UBSAN builtin handling.  This isn't ideal, as we'd like
to remove all the common code, but I'd be willing to put up with UBSAN
duplication for the time being.

This patch disables the assert on the UBSAN builtins, while still
trapping if any other differences are found between the vr_values and
the ranger versions of builtin range handling.

As a follow-up, once Fedora can test this approach, I'll remove all
the builtin code from extract_range_builtin, with the exception of the
UBSAN stuff (renaming it to extract_range_ubsan_builtin).

Since the builtin code has proven fickle across architectures, I've
tested this with {-m32,-m64,-fsanitize=signed-integer-overflow} on
x86, ppc64le, and aarch64.  I think this should be enough.  If it
isn't, we can revert the patch, and leave the duplicate code until
the next release cycle when hopefully vr_values, evrp, and friends
will all be overhauled.

gcc/ChangeLog:

PR tree-optimization/97505
* vr-values.c (vr_values::extract_range_basic): Enable
trap again for everything except UBSAN builtins.

* gcc.dg/pr97596.c: Require int128 effective target.

Add testcase for PR97596

Add testcase

gcc/testsuite
* gcc.dg/pr97596.c: New.

c++: Stop (most) function-scope entities having a template header

Currently push_template_decl (mostly) decides whether to add a
template header to an entity by seeing if it has DECL_LANG_SPECIFIC.
That might have been a useful predicate at one time, but basing
semantic implications on how we've decided to represent decls is bound
to be brittle.  And indeed it is, as more decls grow a use for
lang-specific.  In particular I discovered that function-scope
VAR_DECLs couild grow lang-specific, and thereby get a template
header.  There's no need for that, and it breaks an invariant modules
was expected.

This patch changes that, and bases the descision on the properties of
the decl.  In particular the only function-scope decl that gets a
template header is an implicit-typedef.

I also cleaned up the behaviour of it building a template-info only to
ignore it.

gcc/cp/
* pt.c (push_template_decl): Do not give function-scope entities
other than implicit typedefs a template header. Do not readd
template info to a redeclared template.

libstdc++: Fix memory issue in ranges::lexicographical_compare testcase

libstdc++-v3/ChangeLog:

* testsuite/25_algorithms/lexicographical_compare/constrained.cc:
(test03): Fix initializing the vector vy with the array y of size 4.

vect: Fix load costs for SLP permutes

For the following test case (compiled with load/store lanes
disabled locally):

  void
  f (uint32_t *restrict x, uint8_t *restrict y, int n)
  {
    for (int i = 0; i < n; ++i)
      {
x[i * 2] = x[i * 2] + y[i * 2];
x[i * 2 + 1] = x[i * 2 + 1] + y[i * 2];
      }
  }

we have a redundant no-op permute on the x[] load node:

   node 0x4472350 (max_nunits=8, refcnt=2)
          stmt 0 _5 = *_4;
          stmt 1 _13 = *_12;
          load permutation { 0 1 }

Then, when costing it, we pick a cost of 1, even though we need 4 copies
of the x[] load to match a single y[] load:

   ==> examining statement: _5 = *_4;
   Vectorizing an unaligned access.
   vect_model_load_cost: unaligned supported by hardware.
   vect_model_load_cost: inside_cost = 1, prologue_cost = 0 .

The problem is that the code only considers the permutation for
the first scalar iteration, rather than for all VF iterations.

This patch tries to fix that by making vect_transform_slp_perm_load
calculate the value instead.

gcc/
* tree-vectorizer.h (vect_transform_slp_perm_load): Take an
optional extra parameter.
* tree-vect-slp.c (vect_transform_slp_perm_load): Calculate
the number of loads as well as the number of permutes, taking
the counting loop from...
* tree-vect-stmts.c (vect_model_load_cost): ...here.  Use the
value computed by vect_transform_slp_perm_load for ncopies.

LTO: get_section: add new argument

gcc/ChangeLog:

PR lto/97508
* langhooks.c (lhd_begin_section): Call get_section with
not_existing = true.
* output.h (get_section): Add new argument.
* varasm.c (get_section): Fail when NOT_EXISTING is true
and a section already exists.
* ipa-cp.c (ipcp_write_summary): Remove.
(ipcp_read_summary): Likewise.
* ipa-fnsummary.c (ipa_fn_summary_read): Always read jump
functions summary.
(ipa_fn_summary_write): Always stream it.

libstdc++: Correct PR number in ChangeLog entry

Consistently pass the vector type for scalar SLP cost compute

This avoids randomly (based on whether the stmt is
SLP_TREE_REPRESENTATIVE and not a pattern stmt) passing a vector
type or NULL to the add_stmt_cost hook for scalar code cost
compute.  For example the x86 backend uses only the vector type to
decide on the scalar computation mode which makes costing off.

So the following explicitely passes the vector type and uses
SLP_TREE_VECTYPE for this purpose.

2020-10-29  Richard Biener  <rguenther@suse.de>

* tree-vect-slp.c (vect_bb_slp_scalar_cost): Pass
SLP_TREE_VECTYPE to record_stmt_cost.

libstdc++: Fix some warnings in headers

These are usually suppressed without -Wsystem-headers.

libstdc++-v3/ChangeLog:

* include/bits/hashtable_policy.h (_Local_iterator_base): Cast
value to avoid -Wsign-compare warnings.
* include/bits/regex.h (sub_match::_M_str): Avoid narrowing
conversion.
* include/bits/regex_compiler.tcc (_Compiler::_M_quantifier):
Initialize variable to avoid -Wmaybe-uninitialized warning.
* include/bits/shared_ptr_base.h (_Sp_counted_deleter::_Impl):
Reorder mem-initializer-list to avoid -Wreorder warning.
* include/bits/stl_tree.h (_Rb_tree_impl): Explicitly
initialize base class in copy constructor.
* include/debug/safe_iterator.h (_Safe_iterator): Likewise.
* include/ext/debug_allocator.h: Reorder mem-initializer-list
to avoid -Wreorder warning.
* include/ext/throw_allocator.h (throw_allocator_limit)
(throw_allocator_random): Add user-declared assignment operators
to avoid -Wdeprecated-copy warnings.

Fix the logic conditioning VX_ENTER/LEAVE_TLS_DTOR

Fix a basic #if/#ifdef confusion which leads to improper
choices in some configurations.

2020-10-28  Olivier Hainque  <hainque@adacore.com>

libgcc/
* config/gthr-vxworks-tls.c: Fix preprocessor logic
controlling the definition of VX_ENTER_TLS_DTOR and
VX_LEAVE_TLS_DTOR based on a version major check.

Fix conditional inclusion guard in gthr-vxworks-thread.c

This fixes the name of the macro used to condition the
inclusion of an actual implementation of some of the gthread
support services for VxWorks, to agree with the side
defining that macro based on tests against the targetted
VxWorks version major.

2020-10-28  Olivier Hainque  <hainque@adacore.com>

libgcc/
* config/gthr-vxworks-thread.c: Fix name of macro used
to condition the inclusion of an actual implementation.

opts: Sanity check for param names.

gcc/ChangeLog:

* optc-gen.awk: Check that params start with -param=.
* params.opt: Fix ipa-jump-function-lookups.

CSE conversions within sincos

On platforms in which Aux_[Real_Type] involves non-NOP conversions
(e.g., between single- and double-precision, or between short float
and float), the conversions before the calls are CSEd too late for
sincos to combine calls.

This patch enables the sincos pass to CSE type casts used as arguments
to eligible calls before looking for other calls using the same
operand.

for  gcc/ChangeLog

* tree-ssa-math-opts.c (sincos_stats): Add conv_removed.
(execute_cse_conv_1): New.
(execute_cse_sincos_1): Call it.  Fix return within
FOR_EACH_IMM_USE_STMT.
(pass_cse_sincos::execute): Report conv_inserted.

for  gcc/testsuite/ChangeLog

* gnat.dg/sin_cos.ads: New.
* gnat.dg/sin_cos.adb: New.
* gcc.dg/sin_cos.c: New.

libstdc++: Rename _UniformRandomNumberGenerator parameters

The paper P0346R1 renamed uniform random number generators to
uniform random bit generators, to describe their purpose more
accurately. This makes that same change in one of the relevant
files (but not the others).

libstdc++-v3/ChangeLog:

* include/bits/uniform_int_dist.h (uniform_int_distribution):
Rename _UniformRandomNumberGenerator template parameters to
_UniformRandomBitGenerator, as per P0346R1.

Enable GCC to support Intel Key Locker ISA

gcc/ChangeLog

2018-12-15  Xuepeng Guo  <xuepeng.guo@intel.com>
    Hongyu Wang  <hongyu.wang@intel.com>
    Hongtao Liu  <hongtao.liu@intel.com>

* common/config/i386/cpuinfo.h (get_available_features):
Detect KL, AESKLE and WIDEKL features.
* common/config/i386/i386-common.c
(OPTION_MASK_ISA_KL_SET): New.
(OPTION_MASK_ISA_WIDEKL_SET): Likewise.
(OPTION_MASK_ISA_KL_UNSET): Likewise.
(OPTION_MASK_ISA_WIDEKL_UNSET): Likewise.
(OPTION_MASK_ISA2_AVX2_UNSET): Likewise.
(OPTION_MASK_ISA2_AVX_UNSET): Likewise.
(OPTION_MASK_ISA2_SSE4_2_UNSET): Likewise.
(OPTION_MASK_ISA2_SSE4_1_UNSET): Likewise.
(OPTION_MASK_ISA2_SSE4_UNSET): Likewise.
(OPTION_MASK_ISA2_SSSE3_UNSET): Likewise.
(OPTION_MASK_ISA2_SSE3_UNSET): Likewise.
(OPTION_MASK_ISA2_SSE2_UNSET): Likewise.
(OPTION_MASK_ISA2_SSE_UNSET): Likewise.
(ix86_handle_option): Handle kl and widekl, add dependency chain
for KL and SSE2.
* common/config/i386/i386-cpuinfo.h (enum processor_features):
(FEATURE_KL, FEATURE_AESKLE, FEATURE_WIDEKL): New.
* common/config/i386/i386-isas.h: Add ISA_NAMES_TABLE_ENTRY
for KL, AESKLE and WIDEKL.
* config.gcc: Add keylockerintrin.h.
* doc/invoke.texi: Document new option -mkl and -mwidekl.
* doc/extend.texi: Document kl and widekl.
* config/i386/cpuid.h (bit_KL, bit_AESKLE, bit_WIDEKL): New.
* config/i386/i386-builtin-types.def ((UINT, UINT, V2DI, V2DI, PVOID),
(UINT, UINT, V2DI, PVOID), (VOID, V2DI, V2DI, V2DI, UINT),
(UINT8, PV2DI, V2DI, PCVOID), (UINT8, PV2DI, PCV2DI, PCVOID)): New
function types.
* config/i386/i386-builtin.def: Add
__builtin_ia32_loadiwkey,
__builtin_ia32_aesdec128kl_u8,
__builtin_ia32_aesdec256kl_u8,
__builtin_ia32_aesenc128kl_u8,
__builtin_ia32_aesenc256kl_u8,
__builtin_ia32_aesdecwide128kl_u8,
__builtin_ia32_aesdecwide256kl_u8,
__builtin_ia32_aesencwide128kl_u8,
__builtin_ia32_aesencwide256kl_u8,
__builtin_ia32_encodekey128_u32,
__builtin_ia32_encodekey256_u32.
* config/i386/i386-c.c (ix86_target_macros_internal): Handle
kl and widekl.
* config/i386/i386-options.c (isa2_opts): Add -mkl and -mwidekl.
(ix86_option_override_internal): Handle KL and WIDEKL.
(ix86_valid_target_attribute_inner_p): Add attribute for kl and widekl.
* config/i386/i386-expand.c
(ix86_expand_builtin): Expand Keylocker Builtins.
* config/i386/i386.h (TARGET_KL): New.
(TARGET_KL_P): Likewise.
(TARGET_WIDEKL): Likewise.
(TARGET_WIDEKL_P): Likewise.
(PTA_KL): Likewise.
(PTA_WIDEKL): Likewise.
(PTA_TIGERLAKE): Add PTA_KL, PTA_WIDEKL.
(PTA_ALDERLAKE): Likewise.
* config/i386/i386.opt: Add new option mkl and mwidekl.
* config/i386/keylockerintrin.h: New header file for Keylocker.
* config/i386/immintrin.h: Include keylockerintrin.h.
* config/i386/predicates.md (encodekey128_operation): New
predicate.
(encodekey256_operation): Likewise.
(aeswidekl_operation): Likewise.
* config/i386/sse.md (UNSPECV_LOADIWKEY): New.
(UNSPECV_AESDEC128KLU8): Likewise.
(UNSPECV_AESENC128KLU8): Likewise.
(UNSPECV_AESDEC256KLU8): Likewise.
(UNSPECV_AESENC256KLU8): Likewise.
(UNSPECV_AESDECWIDE128KLU8): Likewise.
(UNSPECV_AESENCWIDE128KLU8): Likewise.
(UNSPECV_AESDECWIDE256KLU8): Likewise.
(UNSPECV_AESENCWIDE256KLU8): Likewise.
(UNSPECV_ENCODEKEY128U32): Likewise.
(UNSPECV_ENCODEKEY256U32): Likewise.
(encodekey128u32): New expander.
(encodekey256u32): Likewise.
(aes<aeswideklvariant>u8): Likewise.
(loadiwkey): New insn pattern.
(*encodekey128u32): Likewise.
(*encodekey256u32): Likewise.
(aes<aesklvariant>u8): Likewise.
(*aes<aeswideklvariant>u8): Likewise.

gcc/testsuite/ChangeLog

* gcc.target/i386/keylocker-aesdec128kl.c: New test.
* gcc.target/i386/keylocker-aesdec256kl.c: Likewise.
* gcc.target/i386/keylocker-aesdecwide128kl.c: Likewise.
* gcc.target/i386/keylocker-aesdecwide256kl.c: Likewise.
* gcc.target/i386/keylocker-aesenc128kl.c: Likewise.
* gcc.target/i386/keylocker-aesencwide128kl.c: Likewise.
* gcc.target/i386/keylocker-aesencwide256kl.c: Likewise.
* gcc.target/i386/keylocker-encodekey128.c: Likewise.
* gcc.target/i386/keylocker-encodekey256.c: Likewise.
* gcc.target/i386/keylocker-loadiwkey.c: Likewise.
* g++.dg/other/i386-2.C: Add -mkl and -mwidekl.
* g++.dg/other/i386-3.C: Likewise.
* gcc.target/i386/sse-12.c: Likewise.
* gcc.target/i386/sse-13.c: Likewise.
* gcc.target/i386/sse-14.c: Likewise.
* gcc.target/i386/sse-22.c: Add kl and widekl.
* gcc.target/i386/sse-23.c: Likewise.
* gcc.target/i386/funcspec-56.inc: Add new target attribute test.

More BB vectorization tweaks

This tweaks the op build from splats to allow loads marked as not
vectorizable.  It also amends some dump prints with the address of
the SLP node or the instance to better be able to debug things.

2020-10-29  Richard Biener  <rguenther@suse.de>

* tree-vect-slp.c (vect_build_slp_tree_2): Allow splatting
not vectorizable loads.
(vect_build_slp_instance): Amend dumping with address.
(vect_slp_convert_to_external): Likewise.

* gcc.dg/vect/bb-slp-pr65935.c: Adjust.

Call infer_non_null() directly when checking for non-null.

Simply call infer_non_null directly and avoid uneccessary checks of
the statement being modified.

gcc/
PR tree-optimization/97609
* gimple-range-cache.cc (non_null_ref::process_name): Call
infer_nonnull_range directly instead of infer_value_range.
gcc/testsuite/
* g++.dg/pr97609.C: New.

libstdc++: Fix new basic_stringbuf constructor

libstdc++-v3/ChangeLog:

* include/std/sstream (basic_stringbuf(__string_type&&, openmode)):
Call _M_init_syncbuf to set up get/put areas. Also qualify
std::move.

libgo: handle linking to NetBSD's versioned symbols

On NetBSD, for backwards compatibility, various libc symbols are
renamed to a symbol with a version suffix. For example, this is the
(abbreviated) definition of sigaction:

    int sigaction(...) __asm__ ("__sigaction14")

This poses a challenge for libgo, which attempts to link sigaction by
way of an "//extern" comment:

    //extern sigaction
    func sigaction(...)

This results in a reference to the deprecated compatibility symbol
"sigaction", rather than the desired "__sigaction14" symbol.

This patch introduces a new "//extern-sysinfo" comment to handle this
situation. The new mklinknames.awk script scans a package for these
comments and outputs a "//go:linkname" directive that links the wrapper
to the correct versioned symbol, as determined by parsing the __asm__
annotation on the function's declaration in gen-sysinfo.go.

For now, only the following packages are scanned by mklinknames.awk:

    os
    os/user
    runtime
    syscall

gotools/:
* Makefile.am (check-runtime): Add runtime_linknames.go to
--extrafiles.
* Makefile.in: Regenerate.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/265125

Daily bump.

analyzer: more non-determinism fixes

gcc/analyzer/ChangeLog:
* program-state.cc (sm_state_map::on_liveness_change): Sort the
leaking svalues before calling on_state_leak.
(program_state::detect_leaks): Likewise when calling
on_svalue_leak.
* region-model-reachability.cc
(reachable_regions::mark_escaped_clusters): Likewise when
calling on_escaped_function.

analyzer: fix false leak diagnostic on offsets from malloc [PR97608]

gcc/analyzer/ChangeLog:
PR analyzer/97608
* region-model-reachability.cc (reachable_regions::handle_sval):
Operands of reachable reversible operations are reachable.

gcc/testsuite/ChangeLog:
PR analyzer/97608
* gcc.dg/analyzer/malloc-1.c (test_42d): New.
* gcc.dg/analyzer/pr97608.c: New test.

analyzer: move svalue and region decls to their own header files

gcc/ChangeLog:
* Makefile.in (ANALYZER_OBJS): Add analyzer/complexity.o.

gcc/analyzer/ChangeLog:
* analyzer.h (class state_machine): New forward decl.
(class logger): Likewise.
(class visitor): Likewise.
* complexity.cc: New file, taken from svalue.cc.
* complexity.h: New file, taken from region-model.h.
* region-model.h: Include "analyzer/svalue.h" and
"analyzer/region.h".  Move struct complexity to complexity.h.
Move svalue, its subclasses and supporting decls to svalue.h.
Move region, its subclasses and supporting decls to region.h.
* region.cc: Include "analyzer/region.h".
(symbolic_region::symbolic_region): Move here from region-model.h.
* region.h: New file, based on material from region-model.h.
* svalue.cc: Include "analyzer/svalue.h".
(complexity::complexity): Move to complexity.cc.
(complexity::from_pair): Likewise.
* svalue.h: New file, based on material from region-model.h.

analyzer: fix more pointer-printing in logs

gcc/analyzer/ChangeLog:
* program-state.cc (sm_state_map::print): Guard the printing of
the origin pointer with !flag_dump_noaddr.
* region.cc (string_region::dump_to_pp): Likewise for
m_string_cst.

libstdc++: Fix linker script

libstdc++-v3/ChangeLog:

* config/abi/pre/gnu.ver (GLIBCXX_3.4.29): Remove duplicate
patterns.
(CXXABI_1.3.13): Restore missing piece.

[RS6000] Don't be too clever with dg-do run and dg-do compile

Otherwise some versions of dejagnu go ahead and run the vsx tests
below when they should not.  To best cope with older dejagnu, put
"run" before "compile", the idea being that if the second dg-do always
wins then that won't cause fails.

The altivec tests also need -save-temps for the scan-assembler test to
occur when vms_hw.

* gcc.target/powerpc/vsx-load-element-extend-char.c: Put "dg-do run"
before "dg-do compile", and make them mutually exclusive.
* gcc.target/powerpc/vsx-load-element-extend-int.c: Likewise.
* gcc.target/powerpc/vsx-load-element-extend-longlong.c: Likewise.
* gcc.target/powerpc/vsx-load-element-extend-short.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-char.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-int.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-longlong.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-short.c: Likewise.
* gcc.target/powerpc/altivec-consts.c: Likewise, add -save-temps.
* gcc.target/powerpc/le-altivec-consts.c: Likewise.

[RS6000] float128-type-2.c unsupported

I noticed this test is unsupported on power10 when looking through
test logs.  There seems no reason why that should be the case, ie.
the target test was meant to be powerpc64*-*-linux*.  And that
simplifies down further.

* gcc.target/powerpc/float128-type-1.c: Simplify target test.
* gcc.target/powerpc/float128-type-2.c: Likewise.

Re: testsuite: Enable and adjust powerpc fold-vec-extract/insert testcases

git commit badeac77f552 changed expected number of addi instructions,
causing these fails on powerpc-linux.

gcc.target/powerpc/fold-vec-insert-int-p9.c: \\maddi\\M found 12 times
FAIL: gcc.target/powerpc/fold-vec-insert-int-p9.c scan-assembler-times \\maddi\\M 8
gcc.target/powerpc/fold-vec-extract-char.p9.c: addi found 6 times
FAIL: gcc.target/powerpc/fold-vec-extract-char.p9.c scan-assembler-times addi 3
gcc.target/powerpc/fold-vec-extract-int.p9.c: \\maddi\\M found 6 times
FAIL: gcc.target/powerpc/fold-vec-extract-int.p9.c scan-assembler-times \\maddi\\M 3
gcc.target/powerpc/fold-vec-extract-longlong.p7.c: \\maddi\\M found 6 times
FAIL: gcc.target/powerpc/fold-vec-extract-longlong.p7.c scan-assembler-times \\maddi\\M 4
gcc.target/powerpc/fold-vec-extract-longlong.p8.c: \\maddi\\M found 6 times
FAIL: gcc.target/powerpc/fold-vec-extract-longlong.p8.c scan-assembler-times \\maddi\\M 4
changed by badeac77f552

I'm not at all sure why we are counting addi.  On linux I see
eight in fold-vec-insert-int-p9.c tearing down the stack frame in
function epilogues, and four in
        addi 9,1,16
        lvewx 0,0,9
For aix you have the above four but with a -16 offset.  There are no
stack frames, and you have four addressing stack red-zone as
        addi 9,1,-64

fold-vec-extract-char.p9.c on linux just has epilogue addi, aix has
red-zone addressing.  The same for fold-vec-extract-int.p9.c,
fold-vec-extract-longlong.p7.c and fold-vec-extract-longlong.p8.c.

It seems silly to count addi in a function epilogue, and fragile to
count them in code.  So remove the ilp32 addi checks.

* gcc.target/powerpc/fold-vec-extract-char.p9.c: Don't check addi
count for ilp32.
* gcc.target/powerpc/fold-vec-extract-int.p9.c: Likewise.
* gcc.target/powerpc/fold-vec-extract-longlong.p7.c: Likewise.
* gcc.target/powerpc/fold-vec-extract-longlong.p8.c: Likewise.
* gcc.target/powerpc/fold-vec-insert-int-p9.c: Likewise.

c++: Improve the MVP -Wparentheses diagnostic.

I noticed that declarator->parenthesized is, for this warning, only set
to the opening paren.  But we can easily make it a range and generate
a nicer diagnostic.  Moreover, we can then offer a fix-it hint.

TL;DR: This patch changes

mvp3.C:8:7: warning: unnecessary parentheses in declaration of ‘i’ [-Wparentheses]
    8 |   int (i);
      |       ^

to

mvp3.C:8:7: warning: unnecessary parentheses in declaration of ‘i’ [-Wparentheses]
    8 |   int (i);
      |       ^~~
mvp3.C:8:7: note: remove parentheses
    8 |   int (i);
      |       ^~~
      |       - -

Tested by using -fdiagnostics-generate-patch and verifying that the
generated patch DTRT.

gcc/cp/ChangeLog:

* decl.c (grokdeclarator): Offer a fix-it hint for the "unnecessary
parentheses in declaration" warning.
* parser.c (cp_parser_direct_declarator): When setting
declarator->parenthesized, use a location range.

gcc/testsuite/ChangeLog:

* g++.dg/warn/mvp3.C: New test.

c++: Deprecate arithmetic convs on different enums [PR97573]

I noticed that C++20 P1120R0 deprecated certain arithmetic conversions
as outlined in [depr.arith.conv.enum], but we don't warn about them.  In
particular, "If one operand is of enumeration type and the other operand
is of a different enumeration type or a floating-point type, this
behavior is deprecated."  These will likely become ill-formed in C++23,
so we should warn by default in C++20.  To this effect, this patch adds
two new warnings (like clang++): -Wdeprecated-enum-enum-conversion and
-Wdeprecated-enum-float-conversion.  They are enabled by default in
C++20.  In older dialects, to enable these warnings you can now use
-Wenum-conversion which I made available in C++ too.  Note that unlike
C, in C++ it is not enabled by -Wextra, because that breaks bootstrap.

We already warn about comparisons of two different enumeration types via
-Wenum-compare, the rest is handled in this patch: we're performing the
usual arithmetic conversions in these contexts:
  - an arithmetic operation,
  - a bitwise operation,
  - a comparison,
  - a conditional operator,
  - a compound assign operator.

Using the spaceship operator as enum <=> real_type is ill-formed but we
don't reject it yet.  We should also address [depr.array.comp] too, but
it's not handled in this patch.

gcc/c-family/ChangeLog:

PR c++/97573
* c-opts.c (c_common_post_options): In C++20, turn on
-Wdeprecated-enum-enum-conversion and
-Wdeprecated-enum-float-conversion.
* c.opt (Wdeprecated-enum-enum-conversion,
Wdeprecated-enum-float-conversion): New options.
(Wenum-conversion): Allow for C++ too.

gcc/cp/ChangeLog:

PR c++/97573
* call.c (build_conditional_expr_1): Warn about the deprecated
enum/real type conversion in C++20.  Also warn about a non-enumerated
and enumerated type in ?: when -Wenum-conversion is on.
* typeck.c (do_warn_enum_conversions): New function.
(cp_build_binary_op): Call it.

gcc/ChangeLog:

PR c++/97573
* doc/invoke.texi: Document -Wdeprecated-enum-enum-conversion
and -Wdeprecated-enum-float-conversion.  -Wenum-conversion is
no longer C/ObjC only.

gcc/testsuite/ChangeLog:

PR c++/97573
* g++.dg/cpp0x/linkage2.C: Add dg-warning.
* g++.dg/parse/attr3.C: Likewise.
* g++.dg/cpp2a/enum-conv1.C: New test.
* g++.dg/cpp2a/enum-conv2.C: New test.
* g++.dg/cpp2a/enum-conv3.C: New test.

c++: Prevent warnings for value-dependent exprs [PR96742]

Here, in r11-155, I changed the call to uses_template_parms to
type_dependent_expression_p_push to avoid a crash in C++98 in
value_dependent_expression_p on a non-constant expression.  But that
prompted a host of complaints that we now warn for value-dependent
expressions in templates.  Those warnings are technically valid, but
people still don't want them because they're awkward to avoid.  This
patch uses value_dependent_expression_p or type_dependent_expression_p.
But make sure that we don't ICE in value_dependent_expression_p by
checking potential_constant_expression first.

gcc/cp/ChangeLog:

PR c++/96675
PR c++/96742
* pt.c (tsubst_copy_and_build): Call value_dependent_expression_p or
type_dependent_expression_p instead of type_dependent_expression_p_push.
But only call value_dependent_expression_p for expressions that are
potential_constant_expression.

gcc/testsuite/ChangeLog:

PR c++/96675
PR c++/96742
* g++.dg/warn/Wdiv-by-zero-3.C: Turn dg-warning into dg-bogus.
* g++.dg/warn/Wtautological-compare3.C: New test.
* g++.dg/warn/Wtype-limits5.C: New test.
* g++.old-deja/g++.pt/crash10.C: Remove dg-warning.

testsuite: Adjust target requirements for sad-vectorize and signbit.

More testcases with incorrect target selectors.

gcc/testsuite/ChangeLog:

* gcc.target/powerpc/sad-vectorize-1.c: Remove AIX skip.
* gcc.target/powerpc/sad-vectorize-2.c: Remove AIX skip.
* gcc.target/powerpc/sad-vectorize-3.c: Remove target.
Require p9vector_hw.
* gcc.target/powerpc/sad-vectorize-4.c: Remove target.
Require p9vector_hw.
* gcc.target/powerpc/signbit-1.c: Remove target.
Require ppc_float128_sw.
* gcc.target/powerpc/signbit-2.c: Remove target.
Require ppc_float128_sw.
* gcc.target/powerpc/signbit-3.c: Remove target.
Require ppc_float128_sw.

c++: Member template function lookup failure [PR94799]

My earlier patch for this PR, r11-86, broke pybind11.  That patch
changed cp_parser_class_name to also consider the object expression
scope (parser->context->object_type) to fix parsing of

  p->template A<T>::foo(); // consider p's scope too

Here we reject

  b.operator typename B<T>::type();

because 'typename_p' in cp_parser_class_name uses 'scope', which means
that 'typename_p' will be true for the example above.  Then we create
a TYPENAME_TYPE via make_typename_type, which fails when tsubsting it;
the code basically created 'typename B::B' and then we complain that there
is no member named 'B' in 'A<int>'.  So, when deciding if we should
create a TYPENAME_TYPE, don't consider the object_type scope, like we
did pre-r11-86.

gcc/cp/ChangeLog:

PR c++/94799
* parser.c (cp_parser_class_name): Use parser->scope when
setting typename_p.

gcc/testsuite/ChangeLog:

PR c++/94799
* g++.dg/template/lookup16.C: New test.

c++: GCC accepts junk before fold-expression [PR86773]

Here we accept a bogus expression before a left fold:

Recall that a fold expression looks like:

 fold-expression:
    ( cast-expression fold-operator ... )
    ( ... fold-operator cast-expression )
    ( cast-expression fold-operator ... fold-operator cast-expression )

but here we have

    ( cast-expression ... fold-operator cast-expression )

The best fix seems to just return error_mark_node when we know this code
is invalid, and let the subsequent code report that a ) was expected.

gcc/cp/ChangeLog:

PR c++/86773
* parser.c (cp_parser_fold_expression): Return error_mark_node
if a left fold is preceded by an expression.

gcc/testsuite/ChangeLog:

PR c++/86773
* g++.dg/cpp1z/fold12.C: New test.

syscall: don't build libcall_bsd.go on solaris

This new file was based on master sources that are built for *BSD
but not Solaris

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/266017

AArch64: Skip test for pr97535 on ILP32 since it can't express the range.

I am excluding the test from ILP32 since the goal of the test is to test
truncations of large numbers above INT_MAX.

gcc/testsuite/ChangeLog:

PR target/97535
* gcc.target/aarch64/pr97535.c: Exclude ILP32.

value-range: Give up on POLY_INT_CST ranges [PR97457]

This PR shows another problem with calculating value ranges for
POLY_INT_CSTs.  We have:

  ivtmp_76 = ASSERT_EXPR <ivtmp_60, ivtmp_60 > POLY_INT_CST [9, 4294967294]>

where the VQ coefficient is unsigned but is effectively acting
as a negative number.  We wrongly give the POLY_INT_CST the range:

  [9, INT_MAX]

and things go downhill from there: later iterations of the unrolled
epilogue are wrongly removed as dead.

I guess this is the final nail in the coffin for doing VRP on
POLY_INT_CSTs.  For other similarly exotic testcases we could have
overflow for any coefficient, not just those that could be treated
as contextually negative.

Testing TYPE_OVERFLOW_UNDEFINED doesn't seem like an option because we
couldn't handle warn_strict_overflow properly.  At this stage we're
just recording a range that might or might not lead to strict-overflow
assumptions later.

It still feels like we should be able to do something here, but for
now removing the code seems safest.  It's also telling that there
are no testsuite failures on SVE from doing this.

gcc/
PR tree-optimization/97457
* value-range.cc (irange::set): Don't decay POLY_INT_CST ranges
to integer ranges.

gcc/testsuite/
PR tree-optimization/97457
* gcc.dg/vect/pr97457.c: New test.

c: Allow omitted parameter names for C2x

C2x allows parameter names to be omitted in function definitions, as
in C++; add support for this feature.  As with other features that
only result in previously rejected code being accepted, this feature
is now accepted as an extension for previous standard versions, with a
pedwarn-if-pedantic that is disabled by -Wno-c11-c2x-compat.  The
logic for avoiding unused-parameter warnings for unnamed parameters is
in code shared between C and C++, so no changes are needed there.

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

gcc/c/
2020-10-28  Joseph Myers  <joseph@codesourcery.com>

* c-decl.c (store_parm_decls_newstyle): Use pedwarn_c11 not
error_at for omitted parameter name.

gcc/testsuite/
2020-10-28  Joseph Myers  <joseph@codesourcery.com>

* gcc.dg/c11-parm-omit-1.c, gcc.dg/c11-parm-omit-2.c,
gcc.dg/c11-parm-omit-3.c, gcc.dg/c11-parm-omit-4.c,
gcc.dg/c2x-parm-omit-1.c, gcc.dg/c2x-parm-omit-2.c,
gcc.dg/c2x-parm-omit-3.c, gcc.dg/c2x-parm-omit-4.c: New tests.
* gcc.dg/noncompile/pr79758.c: Do not expect error for omitted
parameter name.

libstdc++: Implement C++20 features for <sstream>

New ctors and ::view() accessor for -
  * basic_stingbuf
  * basic_istringstream
  * basic_ostringstream
  * basic_stringstreamm

New ::get_allocator() accessor for basic_stringbuf.

libstdc++-v3/ChangeLog:
* acinclude.m4 (glibcxx_SUBDIRS): Add src/c++20.
* config/abi/pre/gnu.ver (GLIBCXX_3.4.29): New symbols.
* configure: Regenerate.
* include/std/sstream:
(basic_stringbuf::basic_stringbuf(allocator const&)): New constructor.
(basic_stringbuf::basic_stringbuf(openmode, allocator const&)): Likewise.
(basic_stringbuf::basic_stringbuf(basic_string&&, openmode)): Likewise.
(basic_stringbuf::basic_stringbuf(basic_stringbuf&&, allocator const&)):
Likewise.
(basic_stringbuf::get_allocator()): New method.
(basic_stringbuf::view()): Likewise.
(basic_istringstream::basic_istringstream(basic_string&&, openmode)):
New constructor.
(basic_istringstream::basic_istringstream(openmode, allocator const&)):
Likewise
(basic_istringstream::view()): New method.
(basic_ostringstream::basic_ostringstream(basic_string&&, openmode)):
New constructor.
(basic_ostringstream::basic_ostringstream(openmode, allocator const&)):
Likewise
(basic_ostringstream::view()): New method.
(basic_stringstream::basic_stringstream(basic_string&&, openmode)):
New constructor.
(basic_stringstream::basic_stringstream(openmode, allocator const&)):
Likewise
(basic_stringstream::view()): New method.
* src/Makefile.in: Add c++20 directory.
* src/Makefile.am: Regenerate.
* src/c++20/Makefile.am: Add makefile for new sub-directory.
* src/c++20/Makefile.in: Generate.
* src/c++20/sstream-inst.cc: New file defining explicit
instantiations for basic_stringbuf, basic_istringstream,
basic_ostringstream, and basic_stringstream member functions
added in C++20.
* testsuite/27_io/basic_stringbuf/cons/char/2.cc: New test.
* testsuite/27_io/basic_stringbuf/cons/wchar_t/2.cc: Likewise.
* testsuite/27_io/basic_stringbuf/view/char/1.cc: Likewise.
* testsuite/27_io/basic_stringbuf/view/wchar_t/1.cc: Likewise.
* testsuite/27_io/basic_istringstream/cons/char/1.cc: Likewise.
* testsuite/27_io/basic_istringstream/cons/wchar_t/1.cc: Likewise.
* testsuite/27_io/basic_istringstream/view/char/1.cc: Likewise.
* testsuite/27_io/basic_istringstream/view/wchar_t/1.cc: Likewise.
* testsuite/27_io/basic_ostringstream/cons/char/1.cc: Likewise.
* testsuite/27_io/basic_ostringstream/cons/wchar_t/1.cc: Likewise.
* testsuite/27_io/basic_ostringstream/view/char/1.cc: Likewise.
* testsuite/27_io/basic_ostringstream/view/wchar_t/1.cc: Likewise.
* testsuite/27_io/basic_stringstream/cons/char/1.cc: Likewise.
* testsuite/27_io/basic_stringstream/cons/wchar_t/1.cc: Likewise.
* testsuite/27_io/basic_stringstream/view/char/1.cc: Likewise.
* testsuite/27_io/basic_stringstream/view/wchar_t/1.cc: Likewise.

c++: Make OMP UDR DECL_LOCAL_DECL_P earlier

I discovered that we were pushing an OMP UDR in a template before
setting DECL_LOCAL_DECL.  This caused the template machinery to give
it some template info.  It doesn't need that, and this changes the
parser to set it earlier.  We have to adjust instantiate_body to not
try and access such a function's non-existant template_info.  The
access checks that we're no longer doing are the same as those we did
on the containing function anyway.  So nothing is lost.

gcc/cp/
* parser.c (cp_parser_omp_declare_reduction): Set
DECL_LOCAL_DECL_P before push_template_decl.
* pt.c (instantiate_body): Nested fns do not have template_info.

VSX_EXTRACT fix

2020-10-28  Carl Love  <cel@us.ibm.com>

gcc/

* config/rs6000/vsx.md(xxgenpcvm_<mode>_internal): Remove TARGET_64BIT.

libstdc++: Fix arithmetic bug in year_month_weekday conversion [PR96713]

The conversion function year_month_weekday::operator sys_days computes
the offset in days from the first weekday of the month with:

 days{(index()-1)*7}
      ^~~~~~~~~~~~~  type 'unsigned'

We want the above to yield -7d when index() is 0u, but our 'days' alias
is based on long instead of int, so the conversion from unsigned to the
underlying type of 'days' instead yields a large positive value.

This patch fixes this by casting the result of index() to int so that
the initializer is sign-extended in the conversion to long.

The added testcase also verifies we do the right thing when index() == 5.

libstdc++-v3/ChangeLog:

PR libstdc++/96713
* include/std/chrono (year_month_weekday::operator sys_days):
Cast the result of index() to int so that the initializer for
days{} is sign-extended when it's converted to the underlying
type.
* testsuite/std/time/year_month_weekday/3.cc: New test.

dump when SLP analysis fails due to shared vectype mismatch

This adds another one.

2020-10-28  Richard Biener  <rguenther@suse.de>

* tree-vect-slp.c (vect_slp_analyze_node_operations_1): Dump
when shared vectype update fails.

c++: Check constraints before instantiation from mark_used [PR95132]

This makes mark_used check constraints of a function _before_ calling
maybe_instantiate_decl, so that we don't try instantiating a function
(as part of return type deduction) with unsatisfied constraints.

gcc/cp/ChangeLog:

PR c++/95132
* decl2.c (mark_used): Move up the constraints_satisfied_p check
so that we check constraints before calling maybe_instantiate_decl.

gcc/testsuite/ChangeLog:

PR c++/95132
* g++.dg/cpp2a/concepts-fn7.C: New test.

c++: Refactor push_template_decl

Sadly I need to wander into push_template_decl again.  But here's a
piece of RAII goodness first.

gcc/cp/
* pt.c (push_template_decl): Refactor for some RAII.

testsuite: Correct requirements for vadsdu*, vslv and vsrv testcases.

This patch renmoves extraneous dg-requirement restrictions on the testcases.

gcc/testsuite/ChangeLog:

* gcc.target/powerpc/vadsdu-0.c: Remove target.
* gcc.target/powerpc/vadsdu-1.c: Remove target.
* gcc.target/powerpc/vadsdu-2.c: Remove target.
* gcc.target/powerpc/vadsdu-3.c: Remove target.
* gcc.target/powerpc/vadsdu-4.c: Remove target.
* gcc.target/powerpc/vadsdu-5.c: Remove target.
* gcc.target/powerpc/vadsdub-1.c: Remove target.
* gcc.target/powerpc/vadsdub-2.c: Remove target.
* gcc.target/powerpc/vadsduh-1.c: Remove target.
* gcc.target/powerpc/vadsduh-2.c: Remove target.
* gcc.target/powerpc/vadsduw-1.c: Remove target.
* gcc.target/powerpc/vadsduw-2.c: Remove target.
* gcc.target/powerpc/vslv-0.c: Remove target.
* gcc.target/powerpc/vslv-1.c: Remove target.
* gcc.target/powerpc/vsrv-0.c: Remove target.
* gcc.target/powerpc/vsrv-1.c: Remove target.

Ignore ignored operands in vect_get_and_check_slp_defs

This passes down skip_args to vect_get_and_check_slp_defs to skip
ignored ops there, too and not fail SLP discovery.  This fixes
gcc.target/aarch64/sve/reduc_strict_5.c

2020-10-28  Richard Biener  <rguenther@suse.de>

* tree-vect-slp.c (vect_get_and_check_slp_defs): For skipped
args just push NULLs and vect_uninitialized_def.
(vect_build_slp_tree_2): Allocate skip_args for all ops
and pass it down to vect_get_and_check_slp_defs.

testsuite: Correct requirements for byte-in-* testcases.

commit 25ffd3d34e means we no longer define an overloaded
__builtin_byte_in_set for -m32, so the more informative
"__builtin_byte_in_set is not supported in this compiler
configuration" is not reported.

This patch changes byte-in-set-2.c to expect an implicit declaration
warning.  It also removes unnecessary target requirement for all
byte-in-*.c tests and no longer skips AIX.

gcc/testsuite/ChangeLog:

2020-10-28  David Edelsohn  <dje.gcc@gmail.com>
    Alan Modra  <amodra@gmail.com>

* gcc.target/powerpc/byte-in-either-range-0.c: Remove target.
* gcc.target/powerpc/byte-in-either-range-1.c: Remove target.
* gcc.target/powerpc/byte-in-range-0.c: Remove target.
* gcc.target/powerpc/byte-in-range-1.c: Remove target.
* gcc.target/powerpc/byte-in-set-0.c: Remove target.
* gcc.target/powerpc/byte-in-set-1.c: Remove target.
* gcc.target/powerpc/byte-in-set-2.c: Remove target. Expect
implicit declaration warning.

Fix gcc.dg/vect/bb-slp-5[89].c

I forgot a vect_double check.

2020-10-28  Richard Biener  <rguenther@suse.de>

* gcc.dg/vect/bb-slp-58.c: Require vect_double.
* gcc.dg/vect/bb-slp-59.c: Likewise.

tree-optimization/97615 - avoid creating externals from patterns

The previous change missed to check for patterns again, the following
corrects that.

2020-10-28  Richard Biener  <rguenther@suse.de>

PR tree-optimization/97615
* tree-vect-slp.c (vect_build_slp_tree_2): Do not build
an external from pattern defs.

* gcc.dg/vect/bb-slp-pr97615.c: New testcase.

Fix iteration over loads in SLP optimize

I've made a typo when refactoring the iteration over all loads in
the SLP graph.  Fixed.

2020-10-28  Richard Biener  <rguenther@suse.de>

* tree-vect-slp.c (vect_optimize_slp): Fix iteration over
all loads.

libstdc++: Add comment to nothrow new explaining catch (...)

The decision to not rethrow a __forced_unwind exception is deliberate,
so add a comment explaining it.

libstdc++-v3/ChangeLog:

* libsupc++/new_opnt.cc (new): Add comment about forced unwind
exceptions.

libstdc++: Override BUFSIZ for Windows targets [PR 94268]

This replaces uses of BUFSIZ with a new _GLIBCXX_BUFSIZ macro that can
be overridden in target-specific config headers.

That allows the mingw and mingw-w64 targets to override it, because
BUFSIZ is apparently defined to 512, resulting in poor performance. The
MSVCRT stdio apparently uses 4096, so we use that too.

libstdc++-v3/ChangeLog:

PR libstdc++/94268
* config/os/mingw32-w64/os_defines.h (_GLIBCXX_BUFSIZ):
Define.
* config/os/mingw32/os_defines.h (_GLIBCXX_BUFSIZ):
Define.
* include/bits/fstream.tcc: Use _GLIBCXX_BUFSIZ instead
of BUFSIZ.
* include/ext/stdio_filebuf.h: Likewise.
* include/std/fstream (_GLIBCXX_BUFSIZ): Define.

Change the way we split stores in BB vectorization

The following fixes missed optimizations due to the strange way we
split stores in BB vectorization.  The solution is to split at
the failure boundary and not re-align that to the initial piece
chosen vector size.  Also re-analyze any larger matching rest.

2020-10-28  Richard Biener  <rguenther@suse.de>

* tree-vect-slp.c (vect_build_slp_instance): Split the store
group at the failure boundary and also re-analyze a large enough
matching rest.

* gcc.dg/vect/bb-slp-68.c: New testcase.

dump reason for throwing away SLP instance

This adds dumping to vect_slp_analyze_node_alignment when it fails
an SLP instance due to shared vector type conflicts.

2020-10-28  Richard Biener  <rguenther@suse.de>

* tree-vect-data-refs.c (vect_slp_analyze_node_alignment):
Dump when vect_update_shared_vectype fails.

libstdc++: Fix name clash with _Cosh in QNX headers [PR 95592]

This replaces unqualified names like _Cosh with struct std::_Cosh to
ensure there is no ambiguity with other entities with the same name.

libstdc++-v3/ChangeLog:

PR libstdc++/95592
* include/bits/valarray_after.h (_DEFINE_EXPR_UNARY_OPERATOR)
(_DEFINE_EXPR_BINARY_OPERATOR, _DEFINE_EXPR_BINARY_FUNCTION):
Use elaborated-type-specifier and qualified-id to avoid
ambiguities with QNX system headers.
* testsuite/26_numerics/valarray/95592.cc: New test.

libstdc++: Make std::span layout-compatible with struct iovec [PR 95609]

This change reorders the data members of std::span so that span<byte> is
layout-compatible with common implementations of struct iovec. This will
allow span<byte> to be used directly in places that use a struct iovec
to do scatter-gather I/O.

It's important to note that POSIX doesn't specify the order of members
in iovec. Also the equivalent type on Windows has members in the other
order, and uses type ULONG (which is always 32-bit whereas size_t is
64-bit for Win64). So this change will only help for certain targets and
an indirection between std::span and I/O system calls will still be
needed for the general case.

libstdc++-v3/ChangeLog:

PR libstdc++/95609
* include/std/span (span): Reorder data members to match common
implementations of struct iovec.
* testsuite/23_containers/span/layout_compat.cc: New test.

aarch64: Add vstN_lane_bf16 + vstNq_lane_bf16 intrinsics

gcc/ChangeLog

2020-10-19  Andrea Corallo  <andrea.corallo@arm.com>

* config/aarch64/arm_neon.h (__ST2_LANE_FUNC, __ST3_LANE_FUNC)
(__ST4_LANE_FUNC): Rename the macro generating the 'q' variants
into __ST2Q_LANE_FUNC, __ST2Q_LANE_FUNC, __ST2Q_LANE_FUNC so they
all can be undefed at the and of the file.
(vst2_lane_bf16, vst2q_lane_bf16, vst3_lane_bf16, vst3q_lane_bf16)
(vst4_lane_bf16, vst4q_lane_bf16): Add new intrinsics.

gcc/testsuite/ChangeLog

2020-10-19  Andrea Corallo  <andrea.corallo@arm.com>

* gcc.target/aarch64/advsimd-intrinsics/arm-neon-ref.h
(hbfloat16_t): Define type.
(CHECK_FP): Make it working for bfloat types.
* gcc.target/aarch64/advsimd-intrinsics/bf16_vstN_lane_1.c: New file.
* gcc.target/aarch64/advsimd-intrinsics/bf16_vstN_lane_2.c: Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vst2_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vst2q_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vst3_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vst3q_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vst4_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vst4q_lane_bf16_indices_1.c:
Likewise.

aarch64: Add bfloat16 vldN_lane_bf16 + vldNq_lane_bf16 intrisics

gcc/ChangeLog

2020-10-15  Andrea Corallo  <andrea.corallo@arm.com>

* config/aarch64/arm_neon.h (__LD2_LANE_FUNC, __LD3_LANE_FUNC)
(__LD4_LANE_FUNC): Rename the macro generating the 'q' variants
into __LD2Q_LANE_FUNC, __LD2Q_LANE_FUNC, __LD2Q_LANE_FUNC so they
all can be undefed at the and of the file.
(vld2_lane_bf16, vld2q_lane_bf16, vld3_lane_bf16, vld3q_lane_bf16)
(vld4_lane_bf16, vld4q_lane_bf16): Add new intrinsics.

gcc/testsuite/ChangeLog

2020-10-15  Andrea Corallo  <andrea.corallo@arm.com>

* gcc.target/aarch64/advsimd-intrinsics/bf16_vldN_lane_1.c: New
testcase.
* gcc.target/aarch64/advsimd-intrinsics/bf16_vldN_lane_2.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vld2_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vld2q_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vld3_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vld3q_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vld4_lane_bf16_indices_1.c:
Likewise.
* gcc.target/aarch64/advsimd-intrinsics/vld4q_lane_bf16_indices_1.c:
Likewise.

[PR97504] riscv needs wraplf for aux_long_long_float too

riscv is another platform on which GNAT maps Long_Long_Float to double
rather than long double, so we have to explicitly avoid the long
double intrinsics.

for  gcc/ada/ChangeLog

PR ada/97504
* Makefile.rtl (LIBGNAT_TARGET_PAIRS> <riscv*-*-*>: Use wraplf
version of Aux_Long_Long_Float.

openmp: Parsing and some semantic analysis of OpenMP allocate clause

This patch adds parsing of OpenMP allocate clause, but still ignores
it during OpenMP lowering where we should for privatized variables
with allocate clause use the corresponding allocators rather than
allocating them on the stack.

2020-10-28  Jakub Jelinek  <jakub@redhat.com>

gcc/
* tree-core.h (enum omp_clause_code): Add OMP_CLAUSE_ALLOCATE.
* tree.h (OMP_CLAUSE_ALLOCATE_ALLOCATOR,
OMP_CLAUSE_ALLOCATE_COMBINED): Define.
* tree.c (omp_clause_num_ops, omp_clause_code_name): Add allocate
clause.
(walk_tree_1): Handle OMP_CLAUSE_ALLOCATE.
* tree-pretty-print.c (dump_omp_clause): Likewise.
* gimplify.c (gimplify_scan_omp_clauses, gimplify_adjust_omp_clauses,
gimplify_omp_for): Likewise.
* tree-nested.c (convert_nonlocal_omp_clauses,
convert_local_omp_clauses): Likewise.
* omp-low.c (scan_sharing_clauses): Likewise.
gcc/c-family/
* c-pragma.h (enum pragma_omp_clause): Add PRAGMA_OMP_CLAUSE_ALLOCATE.
* c-omp.c: Include bitmap.h.
(c_omp_split_clauses): Handle OMP_CLAUSE_ALLOCATE.
gcc/c/
* c-parser.c (c_parser_omp_clause_name): Handle allocate.
(c_parser_omp_clause_allocate): New function.
(c_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_ALLOCATE.
(OMP_FOR_CLAUSE_MASK, OMP_SECTIONS_CLAUSE_MASK,
OMP_PARALLEL_CLAUSE_MASK, OMP_SINGLE_CLAUSE_MASK,
OMP_TASK_CLAUSE_MASK, OMP_TASKGROUP_CLAUSE_MASK,
OMP_DISTRIBUTE_CLAUSE_MASK, OMP_TEAMS_CLAUSE_MASK,
OMP_TARGET_CLAUSE_MASK, OMP_TASKLOOP_CLAUSE_MASK): Add
PRAGMA_OMP_CLAUSE_ALLOCATE.
* c-typeck.c (c_finish_omp_clauses): Handle OMP_CLAUSE_ALLOCATE.
gcc/cp/
* parser.c (cp_parser_omp_clause_name): Handle allocate.
(cp_parser_omp_clause_allocate): New function.
(cp_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_ALLOCATE.
(OMP_FOR_CLAUSE_MASK, OMP_SECTIONS_CLAUSE_MASK,
OMP_PARALLEL_CLAUSE_MASK, OMP_SINGLE_CLAUSE_MASK,
OMP_TASK_CLAUSE_MASK, OMP_TASKGROUP_CLAUSE_MASK,
OMP_DISTRIBUTE_CLAUSE_MASK, OMP_TEAMS_CLAUSE_MASK,
OMP_TARGET_CLAUSE_MASK, OMP_TASKLOOP_CLAUSE_MASK): Add
PRAGMA_OMP_CLAUSE_ALLOCATE.
* semantics.c (finish_omp_clauses): Handle OMP_CLAUSE_ALLOCATE.
* pt.c (tsubst_omp_clauses): Likewise.
gcc/testsuite/
* c-c++-common/gomp/allocate-1.c: New test.
* c-c++-common/gomp/allocate-2.c: New test.
* c-c++-common/gomp/clauses-1.c (omp_allocator_handle_t): New typedef.
(foo, bar, baz): Add allocate clauses where allowed.

openmp: Implicitly discover declare target for variants of declare variant calls

This marks all variants of declare variant also declare target if the base
functions are called directly in target regions or declare target functions.

2020-10-28  Jakub Jelinek  <jakub@redhat.com>

gcc/
* omp-offload.c (omp_declare_target_tgt_fn_r): Handle direct calls to
declare variant base functions.
libgomp/
* testsuite/libgomp.c/target-42.c: New test.

xfail and improve some failing libgomp tests [PR81690]

With the patch I've posted today to fix up declare variant LTO handling,
Tobias reported the patch still doesn't work, and there are two
reasons for that.
One is that when the base function is marked implicitly as declare target,
we don't mark also implicitly the variants.  I'll need to ask on omp-lang
about details for that, but generally the compiler should do it some way.
The other one is that the way base_delay is written, it will always
call the usleep function, which is undesirable for nvptx.  While the
compiler will replace all direct calls to base_delay to nvptx_delay,
the base_delay definition which calls usleep stays.

2020-10-28  Jakub Jelinek  <jakub@redhat.com>
    Tom de Vries  <tdevries@suse.de>

PR testsuite/81690
* testsuite/libgomp.c/usleep.h: New file.
* testsuite/libgomp.c/target-32.c: Include usleep.h.
(main): Use tgt_usleep instead of usleep.
* testsuite/libgomp.c/thread-limit-2.c: Include usleep.h.
(main): Use tgt_usleep instead of usleep.

lto: LTO cgraph support for late declare variant resolution [PR96680]

> I've tried to add the saving/restoring next to ipa refs saving/restoring, as
> the declare variant alt stuff is kind of extension of those, unfortunately
> following doesn't compile, because I need to also write or read a tree there
> (ctx is a portion of DECL_ATTRIBUTES of the base function), but the ipa refs
> write/read back functions don't have arguments that can be used for that.

This patch adds the streaming out and in of those omp_declare_variant_alt
hash table on the side data for the declare_variant_alt cgraph_nodes and
treats for LTO purposes the declare_variant_alt nodes (which have no body)
as if they contained a body that calls all the possible variants.
After IPA all the calls to these magic declare_variant_alt calls are
replaced with call to one of the variant depending on which one has the
highest score in the context.

2020-10-28  Jakub Jelinek  <jakub@redhat.com>

PR lto/96680
gcc/
* lto-streamer.h (omp_lto_output_declare_variant_alt,
omp_lto_input_declare_variant_alt): Declare variant.
* symtab.c (symtab_node::get_partitioning_class): Return
SYMBOL_DUPLICATE for declare_variant_alt nodes.
* passes.c (ipa_write_summaries): Add declare_variant_alt to
partition.
* lto-cgraph.c (output_refs): Call omp_lto_output_declare_variant_alt
on declare_variant_alt nodes.
(input_refs): Call omp_lto_input_declare_variant_alt on
declare_variant_alt nodes.
* lto-streamer-out.c (output_function): Don't call
collect_block_tree_leafs if DECL_INITIAL is error_mark_node.
(lto_output): Call output_function even for declare_variant_alt
nodes.
* omp-general.c (omp_lto_output_declare_variant_alt,
omp_lto_input_declare_variant_alt): New functions.
gcc/lto/
* lto-common.c (lto_fixup_prevailing_decls): Don't use
LTO_NO_PREVAIL on TREE_LIST's TREE_PURPOSE.
* lto-partition.c (lto_balanced_map): Treat declare_variant_alt
nodes like definitions.
libgomp/
* testsuite/libgomp.c/declare-variant-1.c: New test.

wide-int: Fix up set_bit_large

> >> wide_int new_lb = wi::set_bit (r.lower_bound (0), 127)
> >>
> >> and creates the value:
> >>
> >> p new_lb
> >> {<wide_int_storage> = {val = {-65535, -1, 0}, len = 2, precision = 128},
> >> static is_sign_extended = true}
> >
> > This is non-canonical and so invalid, if the low HWI has the MSB set
> > and the high HWI is -1, it should have been just
> > val = {-65535}, len = 1, precision = 128}
> >
> > I guess the bug is that wi::set_bit_large doesn't call canonize.
>
> Yeah, looks like a micro-optimisation gone wrong.

2020-10-28  Jakub Jelinek  <jakub@redhat.com>

* wide-int.cc (wi::set_bit_large): Call canonize unless setting
msb bit and clearing bits above it.

[RS6000] power10 scan-assembler tests

On power10 these are "dg-do run" tests, so need -save-temps for the
assembler scanning.

* gcc.target/powerpc/vsx-load-element-extend-char.c: Add -save-temps.
* gcc.target/powerpc/vsx-load-element-extend-int.c: Likewise.
* gcc.target/powerpc/vsx-load-element-extend-longlong.c: Likewise.
* gcc.target/powerpc/vsx-load-element-extend-short.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-char.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-int.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-longlong.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-short.c: Likewise.

[RS6000] dg-do !compile and scan-assembler

These tests never checked assembly, because .s files were not
produced.  One was looking for the wrong instructions.

A typical error log
PASS: gcc.target/powerpc/vec-permute-ext-runnable.c (test for excess errors)
gcc.target/powerpc/vec-permute-ext-runnable.c output file does not exist
UNRESOLVED: gcc.target/powerpc/vec-permute-ext-runnable.c scan-assembler-times \\mpermx\\M 10

* gcc.target/powerpc/vec-blend-runnable.c: Add save-temps.
* gcc.target/powerpc/vec-insert-word-runnable.c: Likewise.
* gcc.target/powerpc/vec-permute-ext-runnable.c: Likewise.
* gcc.target/powerpc/vec-replace-word-runnable.c: Likewise.
* gcc.target/powerpc/vec-splati-runnable.c: Likewise.
* gcc.target/powerpc/vec-ternarylogic-3.c: Likewise.
* gcc.target/powerpc/vec-ternarylogic-9.c: Likewise.
* gcc.target/powerpc/vsx_mask-count-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-expand-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-extract-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-move-runnable.c: Likewise.
* gcc.target/powerpc/vec-shift-double-runnable.c: Likewise,
and correct assembly match.

Tweaks to ranger API routines.

Remove the gcc_assert wrappers that contain statements that need to be
executed.
Audit routines to ensure range is set to UNDEFINED when false is returned.

* gimple-range-gori.cc (gori_compute_cache::cache_stmt): Accumulate
return values and only set cache when everything returned true.
* gimple-range.cc (get_tree_range): Set the return range to UNDEFINED
when the range isn't supported.
(gimple_ranger::calc_stmt): Return varying if the type is supported,
even if the stmt processing failed.  False otherwise.
(range_of_builtin_ubsan_call): Don't use gcc_assert.
(range_of_builtin_call): Ditto.
(gimple_ranger::range_of_cond_expr): Ditto.
(gimple_ranger::range_of_expr): Ditto
(gimple_ranger::range_on_entry): Ditto.
(gimple_ranger::range_on_exit): Ditto.
(gimple_ranger::range_on_edge): DItto.
(gimple_ranger::range_of_stmt): Don't use gcc_assert, and initialize
return value to UNDEFINED.

Daily bump.

c: Allow duplicate C2x standard attributes

N2557, accepted into C2x at the October WG14 meeting, removes the
requirement that duplicates of standard attributes cannot appear
within an attribute list (so allowing e.g. [[deprecated, deprecated]],
where previously that was disallowed but [[deprecated]] [[deprecated]]
was OK).  Remove the code checking for this (standard attributes
aren't in any released version of the C standard) and update tests
accordingly.

Bootstrapped with no regressions on x86_64-pc-linux-gnu.

gcc/c/
2020-10-27  Joseph Myers  <joseph@codesourcery.com>

* c-parser.c (c_parser_std_attribute_specifier): Allow duplicate
standard attributes.

gcc/testsuite/
2020-10-27  Joseph Myers  <joseph@codesourcery.com>

* gcc.dg/c2x-attr-deprecated-4.c, gcc.dg/c2x-attr-fallthrough-4.c,
gcc.dg/c2x-attr-maybe_unused-4.c: Allow duplicate attributes.

libgo: update to Go 1.15.3 release

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/265717

Fix PR97497

This works around a limitation of gcse with handling of partially
clobbered registers.  With this patch our GOT pointer register r12 is
not marked as partially clobbered anymore for the -m31 -mzarch -fpic
combination. This is correct since all the bits in r12 we actually
care about are in fact preserved.

gcc/ChangeLog:

PR rtl-optimization/97497
* config/s390/s390.c (s390_hard_regno_call_part_clobbered): Do not
return true for r12 when -fpic is used.

gcc/testsuite/ChangeLog:

* gcc.target/s390/pr97497.c: New test.

PR fortran/97491 - Wrong restriction for VALUE arguments of pure procedures

A dummy argument with the VALUE attribute may be redefined in a PURE or
ELEMENTAL procedure.  Adjust the associated purity check.

gcc/fortran/ChangeLog:

* resolve.c (gfc_impure_variable): A dummy argument with the VALUE
attribute may be redefined without making a procedure impure.

gcc/testsuite/ChangeLog:

* gfortran.dg/value_8.f90: New test.

PPC testsuite fixes

2020-10-27  Carl Love  <cel@us.ibm.com>

gcc/testsuite
* gcc.target/powerpc/vec-blend-runnable.c: Change #ifdef
DEBUG to #if DEBUG.
Fix printf line so it is less then 80 characters long.
* gcc.target/powerpc/vec-insert-word-runnable.c: Change
#ifdef DEBUG to #if DEBUG.
* gcc.target/powerpc/vec-permute-ext-runnable.c: Change
#ifdef DEBUG to #if DEBUG.
* gcc.target/powerpc/vec-replace-word-runnable.c: Change
#ifdef DEBUG to #if DEBUG.
Fix printf lines so they are less then 80 characters long.
* gcc.target/powerpc/vec-shift-double-runnable.c: Change
#ifdef DEBUG to #if DEBUG.