gcc/ada/
	* gcc-interface/decl.c (gnat_to_gnu_entity) <discrete_type>: Fix
	thinko in latest change.

gcc/ChangeLog:

2021-08-18  Jan Hubicka  <hubicka@ucw.cz>

	* tree-ssa-uninit.c (maybe_warn_pass_by_reference): Check also
	EAF_NOREAD.

... to document the current behavior.

	gcc/
	* hash-map-tests.c (test_map_of_type_with_ctor_and_dtor): Extend.
	(test_map_of_type_with_ctor_and_dtor_expand): Add function.
	(hash_map_tests_c_tests): Call it.

... to make the meaning more explicit to the reader of the code.

Follow-up to recent commit 0edf2e81
"Turn global 'ggc_force_collect' variable into 'force_collect' parameter to
'ggc_collect'".

	gcc/
	* ggc.h (enum ggc_collect): New.
	(ggc_collect): Use it.
	* ggc-page.c: Adjust.
	* ggc-common.c: Likewise.
	* ggc-tests.c: Likewise.
	* read-rtl-function.c: Likewise.
	* selftest-run-tests.c: Likewise.
	* doc/gty.texi (Invoking the garbage collector): Likewise.

Suggested-by: David Malcolm <dmalcolm@redhat.com>

This patch adds the Fortran interface for omp_alloc/omp_free
and the omp_target_* memory routines, which were added in
OpenMP 5.0 for C/C++ but only OpenMP 5.1 added them for Fortran.

Those functions use BIND(C), i.e. on the libgomp side, the same
interface as for C/C++ is used.

Note: By using BIND(C) in omp_lib.h, files including this file
no longer compiler with -std=f95 but require at least -std=f2003.

libgomp/ChangeLog:

	* omp_lib.f90.in (omp_alloc, omp_free, omp_target_alloc,
	omp_target_free. omp_target_is_present, omp_target_memcpy,
	omp_target_memcpy_rect, omp_target_associate_ptr,
	omp_target_disassociate_ptr): Add interface.
	* omp_lib.h.in (omp_alloc, omp_free, omp_target_alloc,
	omp_target_free. omp_target_is_present, omp_target_memcpy,
	omp_target_memcpy_rect, omp_target_associate_ptr,
	omp_target_disassociate_ptr): Add interface.
	* testsuite/libgomp.fortran/alloc-1.F90: Remove local
	interface block for omp_alloc + omp_free.
	* testsuite/libgomp.fortran/alloc-4.f90: Likewise.
	* testsuite/libgomp.fortran/refcount-1.f90: New test.
	* testsuite/libgomp.fortran/target-12.f90: New test.

As has been clarified, it is intentional that nothing directive is accepted
in substatements of selection and looping statements and after labels and
is handled as if the directive just isn't there, so that
void
foo (int x)
{
  if (x)
    #pragma omp metadirective when (...:nothing) when (...:parallel)
    bar ();
}
behaves consistently; declarative and stand-alone directives aren't allowed
at that point, but constructs are parsed with the following statement as
the construct body and nothing or missing default on metadirective therefore
should handle the following statement as part of the if substatement instead
of having nothing as the substatement and bar done unconditionally after the
if.

2021-08-18  Jakub Jelinek  <jakub@redhat.com>

gcc/c-family/
	* c-pragma.h (enum pragma_kind): Add PRAGMA_OMP_NOTHING.
	* c-pragma.c (omp_pragmas): Add nothing directive.
	* c-omp.c (omp_directives): Uncomment nothing directive entry.
gcc/c/
	* c-parser.c (c_parser_omp_nothing): New function.
	(c_parser_pragma): Handle PRAGMA_OMP_NOTHING.
gcc/cp/
	* parser.c (cp_parser_omp_nothing): New function.
	(cp_parser_pragma): Handle PRAGMA_OMP_NOTHING.
gcc/testsuite/
	* c-c++-common/gomp/nothing-1.c: New test.
	* g++.dg/gomp/attrs-1.C (bar): Add nothing directive test.
	* g++.dg/gomp/attrs-2.C (bar): Likewise.
	* g++.dg/gomp/attrs-9.C: Likewise.
libgomp/
	* testsuite/libgomp.c-c++-common/nothing-1.c: New test.

The argument can be used for addition of Co-Authored-By lines
with --trailer='Co-Authored-By=Mona Lisa Octocat <mona@github.com>'.

contrib/ChangeLog:

	* gcc-git-customization.sh: Wrap $@ in quotes.
	* git-commit-mklog.py: Add new argument --co.
	* mklog.py: Skip the Co-Authored-By lines.

Unlike the C++ FE, the C FE ignored pragmas (as if they weren't there) in
pragma_stmt contexts if c*_parser_pragma returns false only when after labels,
not inside of substatements of selection or loop statements.
After making just that change, several gomp/goacc testcases started failing,
because extra diagnostics has been emitted (in C, in C++ it was emitted
already before).  Say
void
foo (int x)
{
  if (x)
    #pragma omp barrier
}
used to in C emit just an error that the pragma is not allowed in such
contexts, but in C++ emitted both that and a parsing error that
  if (x)
}
is invalid.  So, the rest of this patch is mostly about returning true
after we report that that certain pragma is not allowed in pragma_stmt
contexts, because for error-recovery it seems better to treat the
pragma in that case as something that is the substatement of such if etc.
c*_parser_pragma return value is only ever used for pragma_stmt context,
in which false means act as if the pragma isn't there (e.g. has been handled
already by preprocessor etc.), and true which means it was there.

2021-08-18  Jakub Jelinek  <jakub@redhat.com>

gcc/c/
	* c-parser.c (c_parser_statement_after_labels): Add restart label
	near the start of the function.  If c_parser_pragma returns false,
	goto restart.
	(c_parser_pragma): For PRAGMA_OMP_CANCELLATION_POINT return what
	c_parser_omp_cancellation_point returned.  For PRAGMA_OMP_DECLARE
	return what c_parser_omp_declare returned.  Return true instead of
	false after emitting errors that the directive is not allowed in
	pragma_stmt context.
	(c_parser_omp_ordered): Return true instead of
	false after emitting errors that the directive is not allowed in
	pragma_stmt context.
	(c_parser_omp_target_update): Likewise.
	(c_parser_omp_target_enter_data, c_parser_omp_target_exit_data):
	Change return type from tree to bool, return false if the
	directive should be ignored in pragma_stmt contexts.
	(c_parser_omp_target): Adjust callers of c_parser_omp_target_*_data,
	return their result directly.
	(c_parser_omp_cancellation_point): Change return type from void to
	bool, return false if the directive should be ignored in pragma_stmt
	contexts.
	(c_parser_omp_declare): Likewise.
gcc/cp/
	* parser.c (cp_parser_omp_ordered): Return true instead of
	false after emitting errors that the directive is not allowed in
	pragma_stmt context.
	(cp_parser_omp_target_update): Likewise.
	(cp_parser_omp_cancellation_point): Change return type from void to
	bool, return false if the directive should be ignored in pragma_stmt
	contexts.
	(cp_parser_omp_target_enter_data, cp_parser_omp_target_exit_data):
	Change return type from tree to bool, return false if the
	directive should be ignored in pragma_stmt contexts.
	(cp_parser_omp_target): Adjust callers of cp_parser_omp_target_*_data,
	return their result directly.
	(cp_parser_pragma): For PRAGMA_OMP_CANCELLATION_POINT return what
	cp_parser_omp_cancellation_point returned.  Return true instead of
	false after emitting errors that the directive is not allowed in
	pragma_stmt context.
gcc/testsuite/
	* c-c++-common/gomp/pr63326.c: Don't expect extra "before" errors
	in C++.
	* g++.dg/gomp/attrs-7.C: Don't expect one extra error.
	* g++.dg/gomp/barrier-2.C: Likewise.
	* gcc.dg/gomp/declare-simd-5.c: Likewise.
	* gcc.dg/gomp/barrier-2.c: Likewise.
	* gcc.dg/gomp/declare-variant-2.c: Likewise.

The tune is disabled by default.

gcc/ChangeLog:

	PR target/97147
	* config/i386/i386.h (TARGET_V2DF_REDUCTION_PREFER_HADDPD):
	New macro.
	* config/i386/sse.md (*sse3_haddv2df3_low): Add
	TARGET_V2DF_REDUCTION_PREFER_HADDPD.
	(*sse3_hsubv2df3_low): Ditto.
	* config/i386/x86-tune.def
	(X86_TUNE_V2DF_REDUCTION_PREFER_HADDPD): New tune.

gcc/testsuite/ChangeLog:

	PR target/97147
	* gcc.target/i386/pr54400.c: Adjust testcase.
	* gcc.target/i386/pr94147.c: New test.

Debugging range-ops and gori unwinding needed some help.

	* gimple-range-gori.cc (gori_compute::gori_compute): Enable tracing.
	(gori_compute::compute_operand_range): Add tracing.
	(gori_compute::logical_combine): Ditto.
	(gori_compute::compute_logical_operands): Ditto.
	(gori_compute::compute_operand1_range): Ditto.
	(gori_compute::compute_operand2_range): Ditto.
	(gori_compute::outgoing_edge_range_p): Ditto.
	* gimple-range-gori.h (class gori_compute): Add range_tracer.

Remove tracing in hybrid mode. Add trace/gori/cache tracing options.
tracing options are now  'trace', 'gori', 'cache', or all combined in 'debug'

	* flag-types.h (enum evrp_mode): Adjust evrp-mode values.
	* gimple-range-cache.cc (DEBUG_RANGE_CACHE): Relocate from.
	* gimple-range-trace.h (DEBUG_RANGE_CACHE): Here.
	* params.opt (--param=evrp-mode): Adjust options.

Generalize range tracing into a class and integrae it with gimple_ranger.
Remove the old derived trace_ranger class.

	* Makefile.in (OBJS): Add gimple-range-trace.o.
	* gimple-range-cache.h (enable_new_values): Remove unused prototype.
	* gimple-range-fold.cc: Adjust headers.
	* gimple-range-trace.cc: New.
	* gimple-range-trace.h: New.
	* gimple-range.cc (gimple_ranger::gimple_ranger): Enable tracer.
	(gimple_ranger::range_of_expr): Add tracing.
	(gimple_ranger::range_on_entry): Ditto.
	(gimple_ranger::range_on_exit): Ditto.
	(gimple_ranger::range_on_edge): Ditto.
	(gimple_ranger::fold_range_internal): Ditto.
	(gimple_ranger::dump_bb): Do not calculate edge range twice.
	(trace_ranger::*): Remove.
	(enable_ranger): Never create a trace_ranger.
	(debug_seed_ranger): Move to gimple-range-trace.cc.
	(dump_ranger): Ditto.
	(debug_ranger): Ditto.
	* gimple-range.h: Include gimple-range-trace.h.
	(range_on_entry, range_on_exit): No longer virtual.
	(class trace_ranger): Remove.
	(DEBUG_RANGE_CACHE): Move to gimple-range-trace.h.

Also resolves:
PR middle-end/101854 - Invalid warning -Wstringop-overflow wrong argument

gcc/ChangeLog:

	PR middle-end/101854
	* builtins.c (expand_builtin_alloca): Move warning code to check_alloca
	in gimple-ssa-warn-access.cc.
	* calls.c (alloc_max_size): Move code to check_alloca.
	(get_size_range): Move to pointer-query.cc.
	(maybe_warn_alloc_args_overflow): Move to gimple-ssa-warn-access.cc.
	(get_attr_nonstring_decl): Move to tree.c.
	(fntype_argno_type): Move to gimple-ssa-warn-access.cc.
	(append_attrname): Same.
	(maybe_warn_rdwr_sizes): Same.
	(initialize_argument_information): Move code to
	gimple-ssa-warn-access.cc.
	* calls.h (maybe_warn_alloc_args_overflow): Move to
	gimple-ssa-warn-access.h.
	(get_attr_nonstring_decl): Move to tree.h.
	(maybe_warn_nonstring_arg):  Move to gimple-ssa-warn-access.h.
	(enum size_range_flags): Move to pointer-query.h.
	(get_size_range): Same.
	* gimple-ssa-warn-access.cc (has_location): Remove unused overload
	to avoid Clang -Wunused-function.
	(get_size_range): Declare static.
	(maybe_emit_free_warning): Rename...
	(maybe_check_dealloc_call): ...to this for consistency.
	(class pass_waccess): Add members.
	(pass_waccess::~pass_waccess): Defined.
	(alloc_max_size): Move here from calls.c.
	(maybe_warn_alloc_args_overflow): Same.
	(check_alloca): New function.
	(check_alloc_size_call): New function.
	(check_strncat): Handle another warning flag.
	(pass_waccess::check_builtin): Handle alloca.
	(fntype_argno_type): Move here from calls.c.
	(append_attrname): Same.
	(maybe_warn_rdwr_sizes): Same.
	(pass_waccess::check_call): Define.
	(check_nonstring_args): New function.
	(pass_waccess::check): Call new member functions.
	(pass_waccess::execute): Enable ranger.
	* gimple-ssa-warn-access.h (get_size_range): Move here from calls.h.
	(maybe_warn_nonstring_arg): Same.
	* gimple-ssa-warn-restrict.c: Remove #include.
	* pointer-query.cc (get_size_range): Move here from calls.c.
	* pointer-query.h (enum size_range_flags): Same.
	(get_size_range): Same.
	* tree.c (get_attr_nonstring_decl): Move here from calls.c.
	* tree.h (get_attr_nonstring_decl): Move here from calls.h.

gcc/testsuite/ChangeLog:

	* gcc.dg/attr-alloc_size-5.c: Adjust optimization to -O1.
	* gcc.dg/attr-alloc_size-7.c: Use #pragmas to adjust optimization.
	* gcc.dg/attr-alloc_size-8.c: Adjust optimization to -O1.

	PR middle-end/101854
	* gcc.dg/Wstringop-overflow-72.c: New test.

The following patch implements __is_layout_compatible trait and
__builtin_is_corresponding_member helper function for the
std::is_corresponding_member template function.

As the current definition of layout compatible type has various problems,
which result e.g. in corresponding members in layout compatible types having
different member offsets, the patch anticipates some changes to the C++
standard:
1) class or enumeral types aren't layout compatible if they have different
   alignment or size
2) if two members have different offsets, they can't be corresponding members
   ([[no_unique_address]] with empty types can change that, or alignas
   on the member decls)
3) in unions, bitfields can't correspond to non-unions, or bitfields can't
   correspond to bitfields with different widths, or members with
   [[no_unique_address]] can't correspond to members without that attribute

__builtin_is_corresponding_member for anonymous structs (GCC extension) will
recurse into the anonymous structs.  For anonymous unions it will emit
a sorry if it can't prove such member types can't appear in the
anonymous unions or anonymous aggregates in that union, because
corresponding member is defined only using common initial sequence which is
only defined for std-layout non-union class types and so I have no idea what
to do otherwise in that case.

2021-08-17  Jakub Jelinek  <jakub@redhat.com>

	PR c++/101539
gcc/c-family/
	* c-common.h (enum rid): Add RID_IS_LAYOUT_COMPATIBLE.
	* c-common.c (c_common_reswords): Add __is_layout_compatible.
gcc/cp/
	* cp-tree.h (enum cp_trait_kind): Add CPTK_IS_LAYOUT_COMPATIBLE.
	(enum cp_built_in_function): Add CP_BUILT_IN_IS_CORRESPONDING_MEMBER.
	(fold_builtin_is_corresponding_member, next_common_initial_seqence,
	layout_compatible_type_p): Declare.
	* parser.c (cp_parser_primary_expression): Handle
	RID_IS_LAYOUT_COMPATIBLE.
	(cp_parser_trait_expr): Likewise.
	* cp-objcp-common.c (names_builtin_p): Likewise.
	* constraint.cc (diagnose_trait_expr): Handle
	CPTK_IS_LAYOUT_COMPATIBLE.
	* decl.c (cxx_init_decl_processing): Register
	__builtin_is_corresponding_member builtin.
	* constexpr.c (cxx_eval_builtin_function_call): Handle
	CP_BUILT_IN_IS_CORRESPONDING_MEMBER builtin.
	* semantics.c (is_corresponding_member_union,
	is_corresponding_member_aggr, fold_builtin_is_corresponding_member):
	New functions.
	(trait_expr_value): Handle CPTK_IS_LAYOUT_COMPATIBLE.
	(finish_trait_expr): Likewise.
	* typeck.c (next_common_initial_seqence, layout_compatible_type_p):
	New functions.
	* cp-gimplify.c (cp_gimplify_expr): Fold
	CP_BUILT_IN_IS_CORRESPONDING_MEMBER.
	(cp_fold): Likewise.
	* tree.c (builtin_valid_in_constant_expr_p): Handle
	CP_BUILT_IN_IS_CORRESPONDING_MEMBER.
	* cxx-pretty-print.c (pp_cxx_trait_expression): Handle
	CPTK_IS_LAYOUT_COMPATIBLE.
	* class.c (remove_zero_width_bit_fields): Remove.
	(layout_class_type): Don't call it.
gcc/testsuite/
	* g++.dg/cpp2a/is-corresponding-member1.C: New test.
	* g++.dg/cpp2a/is-corresponding-member2.C: New test.
	* g++.dg/cpp2a/is-corresponding-member3.C: New test.
	* g++.dg/cpp2a/is-corresponding-member4.C: New test.
	* g++.dg/cpp2a/is-corresponding-member5.C: New test.
	* g++.dg/cpp2a/is-corresponding-member6.C: New test.
	* g++.dg/cpp2a/is-corresponding-member7.C: New test.
	* g++.dg/cpp2a/is-corresponding-member8.C: New test.
	* g++.dg/cpp2a/is-layout-compatible1.C: New test.
	* g++.dg/cpp2a/is-layout-compatible2.C: New test.
	* g++.dg/cpp2a/is-layout-compatible3.C: New test.

Signed-off-by: Matt Jacobson <mhjacobson@me.com>

gcc/c-family/ChangeLog:

	* c-opts.c (c_common_post_options): Default to
	flag_objc_sjlj_exceptions = 1 only when flag_objc_abi < 2.

gcc/objc/ChangeLog:

	* objc-next-runtime-abi-02.c
	(objc_next_runtime_abi_02_init): Warn about and reset
	flag_objc_sjlj_exceptions regardless of flag_objc_exceptions.
	(next_runtime_02_initialize): Use a checking assert that
	flag_objc_sjlj_exceptions is off.

This is a follow-up to commit 697b94cf
"libstdc++: Avoid illegal argument to verbose in dg-test callback".
I'm confirming the original problem, but on one system, it's not
resolved by this change, because instead we get:

    extra_tool_flags are:
    ERROR: tcl error sourcing [...]/libstdc++-v3/testsuite/libstdc++-dg/conformance.exp.
    ERROR: usage: send [args] string
        while executing
    "send_log "$message\n""
        (procedure "verbose" line 48)
        invoked from within
    "verbose -log -- $extra_tool_flags"
        (procedure "libstdc++-dg-test" line 45)
        invoked from within
    "${tool}-dg-test $prog [lindex ${dg-do-what} 0] "$tool_flags ${dg-extra-tool-flags}""
        (procedure "saved-dg-test" line 115)
        invoked from within
    [...]

That's Ubuntu's dejagnu 1.5-3ubuntu1 being so old that it doesn't include
DejaGnu commit 57c22601afe43d2c2b8819df4f2ecacb034516fd "Protect from leading
dash in message".  (I suppose that's what'd make this work, but have not
verified.)

	libstdc++-v3/
	* testsuite/lib/libstdc++.exp: Avoid illegal argument to verbose,
	continued.

The default for building host-side binaries for mdynamic-no-pic
hosts is to enable this.  However, it is not compatible with
dynamic libraries, so must be switched off for libcc1.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

libcc1/ChangeLog:

	* Makefile.am: Switch mdynamic-no-pic to fPIC.
	* Makefile.in: Regenerated.

This simplifies the interface and gets us rid of a global variable.
No change in behavior.

Clean-up for 2004-09-02 CVS commit (Subversion r86974,
Git commit 07724022)
"Better memory statistics, take 2".

	gcc/
	* ggc.h (ggc_collect): Add 'force_collect' parameter.
	* ggc-page.c (ggc_collect): Use that one instead of global
	'ggc_force_collect'.  Adjust all users.
	* doc/gty.texi (Invoking the garbage collector): Update.
	* ggc-internal.h (ggc_force_collect): Remove.
	* ggc-common.c (ggc_force_collect): Likewise.
	* selftest.h (forcibly_ggc_collect): Remove.
	* ggc-tests.c (selftest::forcibly_ggc_collect): Likewise.
	* read-rtl-function.c (test_loading_labels): Adjust.
	* selftest-run-tests.c (run_tests): Likewise.

... after it had gotten disabled in r243681 (Git
commit ecfc21ff)
"Introduce selftest::locate_file".

	gcc/testsuite/
	* gcc.dg/pr78213.c: Restore testing.

For a single use (typical compile) this vector will be reclaimed
as GGC.  For JIT this is not sufficient since it does not reset
the pointer to NULL (and thus we think the the vector is already
allocated when a context is reused).

The clears the vector and sets the pointer to NULL at the end
of object output.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

gcc/ChangeLog:

	* config/darwin.c (darwin_file_end): Reset and reclaim the
	section names table at the end of compile.

Versions of the assembler using clang from XCode 12.5/12.5.1
have a bug which produces different code layout between debug and
non-debug input, leading to a compare fail for default configure
parameters.

This is a workaround fix to disable the optimisation that is
responsible for the bug.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

PR target/100340 - Bootstrap fails with Clang 12.0.5 (XCode 12.5)

	PR target/100340

gcc/ChangeLog:

	* config.in: Regenerate.
	* config/i386/darwin.h (EXTRA_ASM_OPTS): New
	(ASM_SPEC): Pass options to disable branch shortening where
	needed.
	* configure: Regenerate.
	* configure.ac: Detect versions of 'as' that support the
	optimisation which has the bug.

This adds a fallback to the masked_ variants for gather_load
and scatter_store if the latter are not available.

2021-08-17  Richard Biener  <rguenther@suse.de>

	* optabs-query.c (supports_vec_gather_load_p): Also check
	for masked optabs.
	(supports_vec_scatter_store_p): Likewise.
	* tree-vect-data-refs.c (vect_gather_scatter_fn_p): Fall
	back to masked variants if non-masked are not supported.
	* tree-vect-patterns.c (vect_recog_gather_scatter_pattern):
	When we need to use masked gather/scatter but do not have
	a mask set up a constant true one.
	* tree-vect-stmts.c (vect_check_scalar_mask): Also allow
	non-SSA_NAME masks.

This fixes an incorrect invocation of gdb on remote targets where
DejaGNU would try to run host's gdb in remote target simulator.
gdb-test skips the testing when target is remote or non native but the
gdb version check function does not.

Suggested-by: Jonathan Wakely <jwakely@redhat.com>
Signed-off-by: Luc Michel <lmichel@kalray.eu>

Co-authored-by: Marc Poulhies <mpoulhies@kalrayinc.com>

libstdc++-v3/ChangeLog:

	* testsuite/lib/gdb-test.exp (gdb_version_check)
	(gdb_version_check_xmethods): Only check the GDB version for
	local native targets.

When std::seed_seq is constructed from random access iterators we can
detect the internal vector size in O(1). Reserving memory for elements
in such cases may avoid multiple memory allocations.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* include/bits/random.tcc (seed_seq::seed_seq): Reserve capacity
	if distance is O(1).
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
	line number.

Co-authored-by: Jonathan Wakely <jwakely@redhat.com>

This patch improves the bit bounds for MINUS_EXPR during tree-ssa's
conditional constant propagation (CCP) pass (and as an added bonus
adds support for POINTER_DIFF_EXPR).

The pessimistic assumptions made by the current algorithm are
demonstrated by considering 1 - (x&1).  Intuitively this should
have possible values 0 and 1, and therefore an unknown mask of 1.
Alas by treating subtraction as a negation followed by addition,
the second operand first becomes 0 or -1, with an unknown mask
of all ones, which results in the addition containing no known bits.

Improved bounds are achieved by using the same approach used for
PLUS_EXPR, determining the result with the minimum number of borrows,
the result from the maximum number of borrows, and examining the bits
they have in common.  One additional benefit of this approach
is that it is applicable to POINTER_DIFF_EXPR, where previously the
negation of a pointer didn't/doesn't make sense.

A more convincing example, where a transformation missed by .032t.cpp
isn't caught a few passes later by .038t.evrp, is the expression
(7 - (x&5)) & 2, which (in the new test case) currently survives the
tree-level optimizers but with this patch is now simplified to the
constant value 2.

2021-08-17  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
	* tree-ssa-ccp.c (bit_value_binop) [MINUS_EXPR]: Use same
	algorithm as PLUS_EXPR to improve subtraction bit bounds.
	[POINTER_DIFF_EXPR]: Treat as synonymous with MINUS_EXPR.

gcc/testsuite/ChangeLog
	* gcc.dg/tree-ssa/ssa-ccp-40.c: New test case.

This patch allows GCC to constant fold (i | (i<<16)) | ((i<<24) | (i<<8)),
where i is an unsigned char, or the equivalent (i*65537) | (i*16777472), to
i*16843009.  The trick is to teach tree_nonzero_bits which bits may be
set in the result of a multiplication by a constant given which bits are
potentially set in the operands.  This allows the optimizations recently
added to match.pd to catch more cases.

The required mask/value pair from a multiplication may be calculated using
a classical shift-and-add algorithm, given we already have implementations
for both addition and shift by constant.  To keep this optimization "cheap",
this functionality is only used if the constant multiplier has a few bits
set (unless flag_expensive_optimizations), and we provide a special case
fast-path implementation for the common case where the (non-constant)
operand has no bits that are guaranteed to be set.  I have no evidence
that this functionality causes performance issues, it's just that sparse
multipliers provide the largest benefit to CCP.

2021-08-17  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
	* tree-ssa-ccp.c (bit_value_mult_const): New helper function to
	calculate the mask-value pair result of a multiplication by an
	unsigned constant.
	(bit_value_binop) [MULT_EXPR]:  Call it from here for
	multiplications by (sparse) non-negative constants.

gcc/testsuite/ChangeLog
	* gcc.dg/fold-ior-5.c: New test case.

Fortran version to commit e45483c7,
which implemented OpenMP's scope construct for C and C++.
Most testcases are based on the C testcases; it also contains some
testcases which existed previously but had no Fortran equivalent.

gcc/fortran/ChangeLog:

	* dump-parse-tree.c (show_omp_node, show_code_node): Handle
	EXEC_OMP_SCOPE.
	* gfortran.h (enum gfc_statement): Add ST_OMP_(END_)SCOPE.
	(enum gfc_exec_op): Add EXEC_OMP_SCOPE.
	* match.h (gfc_match_omp_scope): New.
	* openmp.c (OMP_SCOPE_CLAUSES): Define
	(gfc_match_omp_scope): New.
	(gfc_match_omp_cancellation_point, gfc_match_omp_end_nowait):
	Improve error diagnostic.
	(omp_code_to_statement): Handle ST_OMP_SCOPE.
	(gfc_resolve_omp_directive): Handle EXEC_OMP_SCOPE.
	* parse.c (decode_omp_directive, next_statement,
	gfc_ascii_statement, parse_omp_structured_block,
	parse_executable): Handle OpenMP's scope construct.
	* resolve.c (gfc_resolve_blocks): Likewise
	* st.c (gfc_free_statement): Likewise
	* trans-openmp.c (gfc_trans_omp_scope): New.
	(gfc_trans_omp_directive): Call it.
	* trans.c (trans_code): handle EXEC_OMP_SCOPE.

libgomp/ChangeLog:

	* testsuite/libgomp.fortran/scope-1.f90: New test.
	* testsuite/libgomp.fortran/task-reduction-16.f90: New test.

gcc/testsuite/ChangeLog:

	* gfortran.dg/gomp/scan-1.f90:
	* gfortran.dg/gomp/cancel-1.f90: New test.
	* gfortran.dg/gomp/cancel-4.f90: New test.
	* gfortran.dg/gomp/loop-4.f90: New test.
	* gfortran.dg/gomp/nesting-1.f90: New test.
	* gfortran.dg/gomp/nesting-2.f90: New test.
	* gfortran.dg/gomp/nesting-3.f90: New test.
	* gfortran.dg/gomp/nowait-1.f90: New test.
	* gfortran.dg/gomp/reduction-task-1.f90: New test.
	* gfortran.dg/gomp/reduction-task-2.f90: New test.
	* gfortran.dg/gomp/reduction-task-2a.f90: New test.
	* gfortran.dg/gomp/reduction-task-3.f90: New test.
	* gfortran.dg/gomp/scope-1.f90: New test.
	* gfortran.dg/gomp/scope-2.f90: New test.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* testsuite/26_numerics/random/seed_seq/cons/range.cc: Check
	construction from input iterators.

The std::error_category printer wasn't meant to be part of the commit
adding std::error_code and std::error_condition printers.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* python/libstdcxx/v6/printers.py (StdErrorCatPrinter): Remove.

PR 101923 points out that the unconditional swap in the std::function
move constructor makes it slower than copying an empty std::function.
The copy constructor has to check for the empty case before doing
anything, and that makes it very fast for the empty case.

Adding the same check to the move constructor avoids copying the
_Any_data POD when we don't need to. We can also inline the effects of
swap, by copying each member and then zeroing the pointer members.

This makes moving an empty object at least as fast as copying an empty
object.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	PR libstdc++/101923
	* include/bits/std_function.h (function(function&&)): Check for
	non-empty parameter before doing any work.

The new contains member of the COW string is defined for non-strict
gnu++20 mode as well as for C++23 modes. I think that was left in the
committed patch unintentionally. It is inconsistent with the SSO string,
and doesn't actually compile because it uses the
basic_string_view::contains member which only defined for C++23.

This makes it only defined for C++23.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* include/bits/cow_string.h (basic_string::contains): Do not
	define for -std=gnu++20.

This is done to match an editorial change in the working draft, to
rename the exposition-only not-same-as helper to different-from.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* include/bits/ranges_util.h (__not_same_as): Rename to
	__different_from.
	* include/std/ranges (__not_same_as): Likewise.

This is not required by the standard, but seems useful.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* include/std/utility (exchange): Add noexcept-specifier.
	* testsuite/20_util/exchange/noexcept.cc: New test.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>

libstdc++-v3/ChangeLog:

	* python/libstdcxx/v6/printers.py (StdErrorCodePrinter): Define.
	(build_libstdcxx_dictionary): Register printer for
	std::error_code and std::error_condition.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Test it.

Commit r12-1328 enabled DT_INIT_ARRAY/DT_FINI_ARRAY for all Linux
targets, but this does not work for arm-none-uclinuxfdpiceabi: it
makes all the execution tests fail.

This patch restores the original behavior for uclinuxfdpiceabi.

2021-08-12  Christophe Lyon  <christophe.lyon@foss.st.com>

	gcc/
	PR target/100896
	* config.gcc (gcc_cv_initfini_array): Leave undefined for
	uclinuxfdpiceabi targets.

We iterate over debug stmts from the last one in new_bb, and we insert
them before the first post-label stmt in each dest block, without
moving the insertion iterator, so they end up reversed.  Moving the
insertion iterator fixes this.


for  gcc/ChangeLog

	* tree-inline.c (maybe_move_debug_stmts_to_successors): Don't
	reverse debug stmts.

dump_function_to_file takes the function to dump as a parameter, and
parts of it use the local fun variable where cfun would be used
elsewhere.  Others use cfun, presumably in error.  Fixed to use fun
uniformly.  Added a few more tests for non-NULL fun before
dereferencing it.


for  gcc/ChangeLog

	* tree-cfg.c (dump_function_to_file): Use fun, not cfun.

Remove macros for vld4[q]_lane Neon intrinsics. This is a preparatory
step before adding new modes for structures of Advanced SIMD vectors.

gcc/ChangeLog:

2021-08-16  Jonathan Wright  <jonathan.wright@arm.com>

	* config/aarch64/arm_neon.h (__LD4_LANE_FUNC): Delete.
	(__LD4Q_LANE_FUNC): Likewise.
	(vld4_lane_u8): Define without macro.
	(vld4_lane_u16): Likewise.
	(vld4_lane_u32): Likewise.
	(vld4_lane_u64): Likewise.
	(vld4_lane_s8): Likewise.
	(vld4_lane_s16): Likewise.
	(vld4_lane_s32): Likewise.
	(vld4_lane_s64): Likewise.
	(vld4_lane_f16): Likewise.
	(vld4_lane_f32): Likewise.
	(vld4_lane_f64): Likewise.
	(vld4_lane_p8): Likewise.
	(vld4_lane_p16): Likewise.
	(vld4_lane_p64): Likewise.
	(vld4q_lane_u8): Likewise.
	(vld4q_lane_u16): Likewise.
	(vld4q_lane_u32): Likewise.
	(vld4q_lane_u64): Likewise.
	(vld4q_lane_s8): Likewise.
	(vld4q_lane_s16): Likewise.
	(vld4q_lane_s32): Likewise.
	(vld4q_lane_s64): Likewise.
	(vld4q_lane_f16): Likewise.
	(vld4q_lane_f32): Likewise.
	(vld4q_lane_f64): Likewise.
	(vld4q_lane_p8): Likewise.
	(vld4q_lane_p16): Likewise.
	(vld4q_lane_p64): Likewise.
	(vld4_lane_bf16): Likewise.
	(vld4q_lane_bf16): Likewise.

Remove macros for vld3[q]_lane Neon intrinsics. This is a preparatory
step before adding new modes for structures of Advanced SIMD vectors.

gcc/ChangeLog:

2021-08-16  Jonathan Wright  <jonathan.wright@arm.com>

	* config/aarch64/arm_neon.h (__LD3_LANE_FUNC): Delete.
	(__LD3Q_LANE_FUNC): Delete.
	(vld3_lane_u8): Define without macro.
	(vld3_lane_u16): Likewise.
	(vld3_lane_u32): Likewise.
	(vld3_lane_u64): Likewise.
	(vld3_lane_s8): Likewise.
	(vld3_lane_s16): Likewise.
	(vld3_lane_s32): Likewise.
	(vld3_lane_s64): Likewise.
	(vld3_lane_f16): Likewise.
	(vld3_lane_f32): Likewise.
	(vld3_lane_f64): Likewise.
	(vld3_lane_p8): Likewise.
	(vld3_lane_p16): Likewise.
	(vld3_lane_p64): Likewise.
	(vld3q_lane_u8): Likewise.
	(vld3q_lane_u16): Likewise.
	(vld3q_lane_u32): Likewise.
	(vld3q_lane_u64): Likewise.
	(vld3q_lane_s8): Likewise.
	(vld3q_lane_s16): Likewise.
	(vld3q_lane_s32): Likewise.
	(vld3q_lane_s64): Likewise.
	(vld3q_lane_f16): Likewise.
	(vld3q_lane_f32): Likewise.
	(vld3q_lane_f64): Likewise.
	(vld3q_lane_p8): Likewise.
	(vld3q_lane_p16): Likewise.
	(vld3q_lane_p64): Likewise.
	(vld3_lane_bf16): Likewise.
	(vld3q_lane_bf16): Likewise.