From-SVN: r276655

From-SVN: r276654

has one sub-range.

From-SVN: r276653

From-SVN: r276651

IRA's make_early_clobber_and_input_conflicts checks for cases in
which an output operand is likely to be an earlyclobber and an input
operand is unlikely to be tieable with it.  If so, the allocno for
the output conflicts with the allocno for the input.  This seems
to work well.

However, a similar situation arises if an output operand is likely
to be tied to one of a set of input operands X and if another input
operand has a different value from all of the operands in X.
E.g. if we have:

  0: "=r, r"
  1: "0, r"
  2: "r, 0"
  3: "r, r"

operand 0 will always be tied to operand 1 or operand 2, so if operand 3
is different from them both, operand 0 acts like an earlyclobber as far
as operand 3 (only) is concerned.  The same is true for operand 2 in:

  0: "=r"
  1: "0"
  2: "r"

In the second example, we'd normally have a copy between operand 1 and
operand 0 if operand 1 dies in the instruction, and so there's rarely
a problem.  But if operand 1 doesn't die in the instruction, operand 0
still acts as an earlyclobber for operand 2 (if different from operand 1),
since in that case LRA must copy operand 1 to operand 0 before the
instruction.

As the existing comment says:

    Avoid introducing unnecessary conflicts by checking classes of the
    constraints and pseudos because otherwise significant code
    degradation is possible for some targets.

I think that's doubly true here.  E.g. it's perfectly reasonable to have
constraints like:

  0: "=r, r"
  1: "0, r"
  2: "r, r"

on targets like s390 that have shorter instructions for tied operands,
but that don't want the size difference to influence RA too much.
We shouldn't treat operand 0 as earlyclobber wrt operand 2 in that case.

This patch therefore treats a normal tied non-earlyclobber output as
being effectively earlyclobber wrt to an input if it is so for *all*
preferred alternatives.

2019-10-07  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* ira-lives.c (check_and_make_def_conflict): Handle cases in which
	DEF is not a true earlyclobber but is tied to a specific input
	operand, and so is effectively earlyclobber wrt inputs that have
	different values.
	(make_early_clobber_and_input_conflicts): Pass this case to the above.

From-SVN: r276650

This patch adds CONSTEXPR to constructors and operators in machmode.h,
excluding the controversial constexpr-resistant "() {}" constructors,
which would become "= default" if we required C++11.

Some of the other routines could potentially be constexpr too,
but that can be done on an as-needed basis.

2019-10-07  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* machmode.h (opt_mode): Mark constructors with CONSTEXPR.
	(pod_mode): Mark operators likewise.
	(scalar_int_mode): Mark non-default constructors and
	operators with CONSTEXPR.
	(scalar_float_mode, scalar_mode, complex_mode): Likewise.
	(fixed_size_mode): Likewise.

From-SVN: r276649

The problem in this PR was that vzeroupper has an effect on register
contents, but those effects weren't modelled in the rtl pattern,
which was just an unspec_volatile.

This patch fixes that by running a subpass after vzeroupper insertion
to add SETs and CLOBBERs as appropriate.  See the comments in the patch
for more details.

2019-10-07  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	PR target/91994
	* config/i386/sse.md (avx_vzeroupper): Turn into a define_expand
	and wrap the unspec_volatile in a parallel.
	(*avx_vzeroupper): New define_insn.  Use a match_parallel around
	the unspec_volatile.
	* config/i386/predicates.md (vzeroupper_pattern): Expect the
	unspec_volatile to be wrapped in a parallel.
	* config/i386/i386-features.c (ix86_add_reg_usage_to_vzeroupper)
	(ix86_add_reg_usage_to_vzerouppers): New functions.
	(rest_of_handle_insert_vzeroupper): Use them to add register
	usage information to the vzeroupper instructions.

gcc/testsuite/
	PR target/91994
	* gcc.target/i386/pr91994.c: New test.

From-SVN: r276648

re PR tree-optimization/91975 (worse code for small array copy using pointer arithmetic than array indexing)

2019-10-07  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91975
	* tree-ssa-loop-ivcanon.c (constant_after_peeling): Consistently
	handle invariants.

	* g++.dg/tree-ssa/ivopts-3.C: Adjust.
	* gcc.dg/vect/vect-profile-1.c: Disable cunrolli.
	* gcc.dg/vect/vect-double-reduc-6.c: Disable unrolling of
	the innermost loop.
	* gcc.dg/vect/vect-93.c: Likewise.
	* gcc.dg/vect/vect-105.c: Likewise.
	* gcc.dg/vect/pr79920.c: Likewise.
	* gcc.dg/vect/no-vfa-vect-102.c: Likewise.
	* gcc.dg/vect/no-vfa-vect-101.c: Likewise.
	* gcc.dg/vect/pr83202-1.c: Operate on a larger array.
	* gfortran.dg/vect/vect-8.f90: Likewise.
	* gcc.dg/tree-ssa/cunroll-2.c: Scan early unrolling dump instead
	of late one.

From-SVN: r276645

From-SVN: r276644

	Commit this missing part which had been rejected.

From-SVN: r276640

As Maxim pointed out, r276309 broke -O3 bootstrap for aarch64-linux-gnu.
It turns out that EXECUTE_IF_SET_IN_HARD_REG_SET isn't safe to use for
temporary objects because their lifetimes don't extend to the end of
the loop.  This patch therefore uses an explicit temporary instead.

Other patches in the series already used this style (but for
full_reg_and_partial_clobbers rather than full_reg_clobbers),
so AFAICT this is the only place that needs fixing.

2019-10-06  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* var-tracking.c (dataflow_set_clear_at_call): Hoist temporary
	function result outside of EXECUTE_IF_SET_IN_HARD_REG_SET.

From-SVN: r276639

	* include/bits/stl_algo.h
	(__copy_n_a(_IIte, _Size, _OIte)): New.
	(__copy_n_a(istreambuf_iterator<>, _Size, _CharT*)): New declaration.
	(__copy_n(_IIte, _Size, _OIte, input_iterator_tag)): Adapt to use
	latter.
	* include/bits/streambuf_iterator.h (istreambuf_iterator<>): Declare
	std::__copy_n_a friend.
	(__copy_n_a(istreambuf_iterator<>, _Size, _CharT*)): New.
	* testsuite/25_algorithms/copy_n/istreambuf_iterator/1.cc: New.
	* testsuite/25_algorithms/copy_n/istreambuf_iterator/1_neg.cc: New.
	* testsuite/25_algorithms/copy_n/istreambuf_iterator/2_neg.cc: New.

From-SVN: r276638

	* include/bits/stl_iterator_base_types.h (__iterator_category_t): Define
	for C++11.
	(_RequireInputIte): Likewise and use __enable_if_t.
	* include/std/numeric
	(__is_random_access_iter): Use __iterator_category_t.

From-SVN: r276637

	* include/bits/stl_algo.h (copy_n): Add __glibcxx_requires_can_increment
	debug checks.
	* testsuite/25_algorithms/copy_n/debug/1_neg.cc: New.
	* testsuite/25_algorithms/copy_n/debug/2_neg.cc: New.

From-SVN: r276636

This fixes two error messages to avoid punctuation and contracted
negations.

gcc/ChangeLog:

2019-10-06  Iain Sandoe  <iain@sandoe.co.uk>

	* config/darwin.c (darwin_override_options): Adjust objective-c
	ABI version error messages to avoid punctuation and contracted
	negations.

From-SVN: r276635

From-SVN: r276634

	In my previous commit, I managed to include a duplicate copy
	of the ChangeLog file.  This commit removes the duplicate
	portion.

From-SVN: r276630

	* ipa-inline.c: Fix type; compute size rather than self_size
	for size of caller function.

From-SVN: r276629

re PR fortran/47054 (Compilation error when cray pointers are declared in both host and internal subroutines)

2019-10-05  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/47045
	* decl.c (variable_decl): Do not search parent namespace for symbol.

2019-10-05  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/47045
	* gfortran.dg/pr47054_1.f90: New test
	* gfortran.dg/pr47054_2.f90: Ditto.

From-SVN: r276627

2019-10-05  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/91497
	* gfortran.dg/pr91497.f90: Run on i?86-*-* and x86_64-*-* only.

From-SVN: r276626

2019-10-05  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/91926
	* trans-expr.c (gfc_conv_gfc_desc_to_cfi_desc): Correct the
	assignment of the attribute field to account correctly for an
	assumed shape dummy. Assign separately to the gfc and cfi
	descriptors since the atribute can be different. Add btanch to
	correctly handle missing optional dummies.

2019-10-05  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/91926
	* gfortran.dg/ISO_Fortran_binding_13.f90 : New test.
	* gfortran.dg/ISO_Fortran_binding_13.c : Additional source.
	* gfortran.dg/ISO_Fortran_binding_14.f90 : New test.

2019-10-05  Paul Thomas  <pault@gcc.gnu.org>

	PR fortran/91926
	* runtime/ISO_Fortran_binding.c (cfi_desc_to_gfc_desc): Do not
	modify the bounds and offset for CFI_other.

From-SVN: r276624

Darwin's linker doesn't like text section relocations (they require special
enabling).  At least, the Fortran FE seems to generate cases where the
initialiser for a pointer constant can need a relocation.  We can handle
this by special-casing SECCAT_RODATA when the relocation is present by
placing the constant in the .const_data section.

gcc/ChangeLog:

2019-10-05  Iain Sandoe  <iain@sandoe.co.uk>

	PR target/59888
	* config/darwin.c (darwin_rodata_section): Add relocation flag,
	choose const_data section for constants with relocations.
	(machopic_select_section): Pass relocation flag to
	darwin_rodata_section ().

From-SVN: r276623

	PR c++/91369 - Implement P0784R7: constexpr new
c-family/
	* c-cppbuiltin.c (c_cpp_builtins): Predefine
	__cpp_constexpr_dynamic_alloc=201907 for -std=c++2a.
cp/
	* cp-tree.h (enum cp_tree_index): Add CPTI_HEAP_UNINIT_IDENTIFIER,
	CPTI_HEAP_IDENTIFIER and CPTI_HEAP_DELETED_IDENTIFIER.
	(heap_uninit_identifier, heap_identifier, heap_deleted_identifier):
	Define.
	(type_has_constexpr_destructor, build_new_constexpr_heap_type,
	cxx_constant_dtor): Declare.
	* class.c (type_maybe_constexpr_default_constructor): Make static.
	(type_maybe_constexpr_destructor, type_has_constexpr_destructor): New
	functions.
	(finalize_literal_type_property): For c++2a, don't clear
	CLASSTYPE_LITERAL_P for types without trivial destructors unless they
	have non-constexpr destructors.
	(explain_non_literal_class): For c++2a, complain about non-constexpr
	destructors rather than about non-trivial destructors.
	* constexpr.c: Include stor-layout.h.
	(struct constexpr_global_ctx): New type.
	(struct constexpr_ctx): Add global field, remove values and
	constexpr_ops_count.
	(cxx_replaceable_global_alloc_fn): New inline function.
	(cxx_eval_call_expression): For c++2a allow calls to replaceable
	global allocation functions, for new return address of a heap uninit
	var, for delete record its deletion.  Change ctx->values->{get,put} to
	ctx->global->values.{get,put}.
	(non_const_var_error): Add auto_diagnostic_group sentinel.  Emit
	special diagnostics for heap variables.
	(cxx_eval_store_expression): Change ctx->values->{get,put} to
	ctx->global->values.{get,put}.
	(cxx_eval_loop_expr): Initialize jump_target if NULL.  Change
	new_ctx.values->remove to ctx->global->values.remove.
	(cxx_eval_constant_expression): Change *ctx->constexpr_ops_count
	to ctx->global->constexpr_ops_count.  Change ctx->values->{get,put} to
	ctx->global->values.{get,put}.
	<case NOP_EXPR>: Formatting fix.  On cast of replaceable global
	allocation function to some pointer type, adjust the type of
	the heap variable and change name from heap_uninit_identifier
	to heap_identifier.
	(find_heap_var_refs): New function.
	(cxx_eval_outermost_constant_expr): Add constexpr_dtor argument,
	handle evaluation of constexpr dtors and add tracking of heap
	variables.  Use tf_no_cleanup for get_target_expr_with_sfinae.
	(cxx_constant_value): Adjust cxx_eval_outermost_constant_expr caller.
	(cxx_constant_dtor): New function.
	(maybe_constant_value, fold_non_dependent_expr_template,
	maybe_constant_init_1): Adjust cxx_eval_outermost_constant_expr
	callers.
	(potential_constant_expression_1): Ignore clobbers.  Allow
	COND_EXPR_IS_VEC_DELETE for c++2a.
	* decl.c (initialize_predefined_identifiers): Add heap identifiers.
	(decl_maybe_constant_destruction): New function.
	(cp_finish_decl): Don't clear TREE_READONLY for constexpr variables
	with non-trivial, but constexpr destructors.
	(register_dtor_fn): For constexpr variables with constexpr non-trivial
	destructors call cxx_maybe_build_cleanup instead of adding destructor
	calls at runtime.
	(expand_static_init): For constexpr variables with constexpr
	non-trivial destructors call cxx_maybe_build_cleanup.
	(grokdeclarator): Allow constexpr destructors for c++2a.  Formatting
	fix.
	(cxx_maybe_build_cleanup): For constexpr variables with constexpr
	non-trivial destructors call cxx_constant_dtor instead of adding
	destructor calls at runtime.
	* init.c: Include stor-layout.h.
	(build_new_constexpr_heap_type, maybe_wrap_new_for_constexpr): New
	functions.
	(build_new_1): For c++2a and new[], add cast around the alloc call
	to help constexpr evaluation figure out the type of the heap storage.
	(build_vec_delete_1): Set DECL_INITIAL of tbase and emit a DECL_EXPR
	for it instead of initializing an uninitialized variable.
	* method.c: Include intl.h.
	(SFK_CTOR_P, SFK_DTOR_P, SFK_ASSIGN_P, SFK_COPY_P, SFK_MOVE_P): Move
	definitions earlier.
	(process_subob_fn): Add sfk argument, adjust non-constexpr call
	diagnostics based on it.
	(walk_field_subobs): Formatting fixes.  Adjust process_subob_fn caller.
	(synthesized_method_base_walk): Likewise.
	(synthesized_method_walk): Set *constexpr_p to true for dtors in c++2a.
	Fix up DR number in comment.
	(implicitly_declare_fn): Formatting fix.
	* typeck2.c (store_init_value): Don't call cp_fully_fold_init on
	initializers of automatic non-constexpr variables in constexpr
	functions.
testsuite/
	* g++.dg/cpp0x/constexpr-delete2.C: Adjust expected diagnostics for
	c++2a.
	* g++.dg/cpp0x/locations1.C: Only expect constexpr ~S() diagnostics
	in c++17_down, adjust expected wording.
	* g++.dg/cpp1y/constexpr-new.C: Only expect diagnostics in c++17_down.
	* g++.dg/cpp2a/constexpr-dtor1.C: New test.
	* g++.dg/cpp2a/constexpr-dtor2.C: New test.
	* g++.dg/cpp2a/constexpr-dtor3.C: New test.
	* g++.dg/cpp2a/constexpr-new1.C: New test.
	* g++.dg/cpp2a/constexpr-new2.C: New test.
	* g++.dg/cpp2a/constexpr-new3.C: New test.
	* g++.dg/cpp2a/constexpr-new4.C: New test.
	* g++.dg/cpp2a/feat-cxx2a.C: Add __cpp_constinit and
	__cpp_constexpr_dynamic_alloc tests.  Tweak __cpp_* tests for c++2a
	features to use style like older features, including #ifdef test.
	* g++.dg/ext/is_literal_type3.C: New test.

From-SVN: r276622

	PR tree-optimization/91734
	* generic-match-head.c: Include fold-const-call.h.
	* match.pd (sqrt(x) cmp c): Check the boundary value and
	in case inexact computation of c*c affects comparison of the boundary,
	turn LT_EXPR into LE_EXPR, GE_EXPR into GT_EXPR, LE_EXPR into LT_EXPR
	or GT_EXPR into GE_EXPR.  Punt for sqrt comparisons against NaN and
	for -frounding-math.  For c2, try the next smaller or larger floating
	point constant depending on comparison code and if it has the same
	sqrt as c2, use it instead of c2.

	* gcc.dg/pr91734.c: New test.

From-SVN: r276621

From-SVN: r276618

C2x adds strftime %OB and %Ob formats, for alternative forms of month
names (for mainly Slavic languages where a month name on its own is
declined differently from a month name together with a date within
that month).  This patch adds corresponding format checking support.
(glibc support for these formats was added in glibc 2.27.)

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

	PR c/82752
gcc/c-family:
	* c-format.c (C_STD_VER): Handle C2x.
	(C_STD_NAME): Likewise.
	(strftime_flag_specs): Add 'O' modifier with 'p' flag.
	(time_char_table): Use separate entry for 'B' and 'b', with 'O'
	modifier allowed and 'p' flag.
	* c-format.h (enum format_std_version): Add STD_C2X.
	(struct format_char_info): Mention 'p' in comment on flags2.

gcc/testsuite:
	* gcc.dg/format/c2x-strftime-1.c: New test.

From-SVN: r276605

gcc/ChangeLog:

	PR middle-end/91977
	* tree-ssa-strlen.c (count_nonzero_bytes): Handle assignments with
	MEM_REF right operand.  Avoid failing for MEM_REF assignments from
	uninitialized objects.

gcc/testsuite/ChangeLog:

	PR middle-end/91977
	* gcc.dg/Wstringop-overflow-18.c: New test.

From-SVN: r276603

gcc/ChangeLog:

	* builtins.c (compute_objsize): Add an argument.
	* tree-object-size.c (addr_object_size): Same.
	(compute_builtin_object_size): Same.
	* tree-object-size.h (compute_builtin_object): Same.

gcc/testsuite/ChangeLog:

	* gcc.dg/Wstringop-overflow-17.c: New test.

From-SVN: r276602

2019-10-04  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran.91959
	* fortran/decl.c (variable_decl): Re-arrange code for matching %FILL.

2019-10-04  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran.91959
	* gfortran.dg/pr91959.f90: New test.

From-SVN: r276601

	* include/debug/forward_list
	(_Sequence_traits<__debug::forward_list<>>::_S_size): Returns __dp_sign
	distance when not empty.
	* include/debug/list (_Sequence_traits<__debug::list<>>::_S_size):
	Likewise.
	* include/debug/helper_functions.h (__dp_sign_max_size): New
	_Distance_precision enum entry.
	(__valid_range_aux(_IIte, _IIte, _Distance_traits<>::__type,
	__false_type)): Adapt.
	* include/debug/safe_iterator.tcc
	(_Safe_iterator<>::_M_get_distance_to(const _Safe_iterator&)): Review
	distance computation.

From-SVN: r276600

From-SVN: r276597

https://gcc.gnu.org/ml/gcc-patches/2019-10/msg00371.html
	PR preprocessor/91991
	* line-map.c (linemap_line_start): Clear max_column_hint if we run
	out of locations.

From-SVN: r276596

        * match.pd (sinh (x) / cosh (x)): New simplification rule.

        * gcc.dg/sinhovercosh-1.c: New test.

From-SVN: r276595

    
    The machinery that collects types referenced by expressions that are
    part of inlinable function bodies was missing the types of local named
    constants in certain cases. This patch updates the
    Collect_export_references::expression() hook to look for references to
    local named constants and include their types in the exported set.
    
    Fixes golang/go#34577.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/198017

From-SVN: r276594

2019-10-04  Martin Jambor  <mjambor@suse.cz>

	* tree-ssa-forwprop.c (simplify_builtin_call): Set gimple call
	fntype when switching to calling memcpy instead of memset.

From-SVN: r276593

2019-10-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * hash-table.h (hash_table::empty_slow): Don't assign
        size_t values to int variables.

From-SVN: r276592

2019-10-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * expr.c (convert_mode_scalar): Remove shadowing local var.
        (emit_block_move): Rename local vars.
        (block_move_libcall_safe_for_call_parm): Remove shadowing local var.
        (emit_push_insn): Rename local vars.
        (expand_assignment): Fix wrong mode in assign_stack_temp.  Remove
        shadowing local vars.
        (store_constructor): Remove shadowing local vars.  Rename local var.
        (store_field, expand_cond_expr_using_cmove,
        expand_expr_real_2): Remove shadowing local vars.
        (expand_expr_real_1,
        do_store_flag): Remove shadowing local vars.  Rename local vars.

From-SVN: r276591

2019-10-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * cgraph.h (FOR_EACH_ALIAS): Avoid shadowing the loop variable.

From-SVN: r276590

2019-10-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * genmatch.c (commutate): Rename local var.
        (lower_cond): Reuse local var.
        (dt_node::gen, dt_node::gen_kids, dt_node::gen_kids_1,
        dt_operand::gen, dt_operand::gen_gimple_expr,
        dt_simplify::gen): Add a param.  Rename generated vars.
        (decision_tree::insert_operand,
        (capture_info::walk_match, capture_info::walk_result,
        capture_info::walk_c_expr): Rename local vars.
        (expr::gen_transform): Rename generated vars.
        Use snprintf.  Rename local vars.
        (capture::gen_transform, dt_operand::get_name,
        dt_operand::gen_opname): Rename generated vars.
        (write_predicate): Adjust call to gen_kids.
        (parser::get_internal_capture_id): Rename generated vars.
        (parser::parse_expr): Rename local vars.
        (parser::parse_if): Remove local var.
        (parser::parse_pattern, add_operator): Rename local vars.

From-SVN: r276589

Various built-in functions that GCC has as extensions are now standard
functions in C2x.  This patch adds DEF_C2X_BUILTIN and uses it to mark
them as such.  Some of the so-marked functions were previously
DEF_EXT_LIB_BUILTIN, while some DFP ones were DEF_GCC_BUILTIN
(i.e. __builtin_* only); both sets become DEF_C2X_BUILTIN.  This in
turn requires flag_isoc2x to be defined in various front ends using
builtins.def.

As the semantics of the built-in functions should already be tested,
the tests added only verify that they are declared in C2x mode but not
in C11 mode.  The test of DFP built-in functions being declared for
C2x goes in gcc.dg/dfp/, as while such built-in functions currently
don't depend on whether DFP is supported, that looks like a bug to me
(see bug 91985), so it seems best for the tests not to depend on
exactly how that bug might be fixed.

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

gcc:
	* builtins.def (DEF_C2X_BUILTIN): New macro.
	(exp10, exp10f, exp10l, fabsd32, fabsd64, fabsd128, nand32)
	(nand64, nand128, roundeven, roundevenf, roundevenl, strdup)
	(strndup): Use DEF_C2X_BUILTIN.
	* coretypes.h (enum function_class): Add function_c2x_misc.

gcc/ada:
	* gcc-interface/utils.c (flag_isoc2x): New variable.

gcc/brig:
	* brig-lang.c (flag_isoc2x): New variable.

gcc/lto:
	* lto-lang.c (flag_isoc2x): New variable.

gcc/testsuite:
	* gcc.dg/c11-builtins-1.c, gcc.dg/c2x-builtins-1.c,
	gcc.dg/dfp/c2x-builtins-dfp-1.c: New tests.

From-SVN: r276588