If we don't HONOR_NANS we should not try to use any unordered
comparison results.  Best case those will just be optimized away;
realistically, they ICE.  For example, the rs6000 backend has some
code that specifically checks we never do this.


	PR tree-optimization/88055
	* tree-call-cdce.c (comparison_code_if_no_nans): New function.
	(gen_one_condition): Use it if !HONOR_NANS.

From-SVN: r270460

/cp
2019-04-19  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/89900
	* pt.c (fn_type_unification): When handling null explicit
	arguments do not special case non-parameter packs.

/testsuite
2019-04-19  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/89900
	* g++.dg/cpp0x/pr89900-1.C: New.
	* g++.dg/cpp0x/pr89900-2.C: Likewise.
	* g++.dg/cpp0x/pr89900-3.C: Likewise.
	* g++.dg/cpp0x/pr89900-4.C: Likewise.

From-SVN: r270459

    
    This patch is required in order to build golang.org/x/net. The
    corresponding Go Toolchain patch is CL 170537.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/172898

From-SVN: r270458

	PR middle-end/90139
	* tree-outof-ssa.c (get_temp_reg): If reg_mode is BLKmode, return
	assign_temp instead of gen_reg_rtx.

	* gcc.c-torture/compile/pr90139.c: New test.

From-SVN: r270457

	PR c++/90138
	* pt.c (process_template_parm): Set decl to pushdecl result.  If
	!is_non_type, also set parm to that.

	* g++.dg/template/pr90138.C: New test.

From-SVN: r270456

re PR c/89888 (When switch controlling expression is promoted from type narrower than int, GCC does not diagnose identical cases)

	PR c/89888
	* c-common.h (c_add_case_label): Remove orig_type and outside_range_p
	arguments.
	(c_do_switch_warnings): Remove outside_range_p argument.
	* c-common.c (check_case_bounds): Removed.
	(c_add_case_label): Remove orig_type and outside_range_p arguments.
	Don't call check_case_bounds.  Fold low_value as well as high_value.
	* c-warn.c (c_do_switch_warnings): Remove outside_range_p argument.
	Check for case labels outside of range of original type here and
	adjust them.
c/
	* c-typeck.c (struct c_switch): Remove outside_range_p member.
	(c_start_case): Don't clear it.
	(do_case): Adjust c_add_case_label caller.
	(c_finish_case): Adjust c_do_switch_warnings caller.
cp/
	* decl.c (struct cp_switch): Remove outside_range_p member.
	(push_switch): Don't clear it.
	(pop_switch): Adjust c_do_switch_warnings caller.
	(finish_case_label): Adjust c_add_case_label caller.
testsuite/
	* c-c++-common/pr89888.c: New test.
	* g++.dg/torture/pr40335.C: Change dg-bogus into dg-warning.
	Don't expect -Wswitch-unreachable warning.

From-SVN: r270455

2019-04-19  Christophe Lyon  <christophe.lyon@linaro.org>

	PR translation/90118

	contrib/
	* check-internal-format-escaping.py: Check that %< is not next to
	a word.

	gcc/
	* config/aarch64/aarch64.c (aarch64_override_options_internal):
	Add missing space before %<.

From-SVN: r270454

	PR c++/90108
	* c-decl.c (merge_decls): If remove is main variant and
	DECL_ORIGINAL_TYPE is some other type, remove a DECL_ORIGINAL_TYPE
	variant that has newdecl as TYPE_NAME if any.

	* decl.c (duplicate_decls): If remove is main variant and
	DECL_ORIGINAL_TYPE is some other type, remove a DECL_ORIGINAL_TYPE
	variant that has newdecl as TYPE_NAME if any.

	* c-c++-common/pr90108.c: New test.

From-SVN: r270453

From-SVN: r270451

	PR rtl-optimization/87871
	* ira-lives.c (make_object_dead): Don't add conflicts to
	TOTAL_CONFLICT_HARD_REGS for register ignore_reg_for_conflicts.

From-SVN: r270448

gcc/ChangeLog:
	* tree.h (TYPE_VECTOR_SUBPARTS): Use HOST_WIDE_INT_1U.
	* config/aarch64/aarch64.c (aarch64_simd_vector_alignment): Avoid
	assuming type size fits in SHWI.

From-SVN: r270447

	PR ipa/85051
	* ipa-inline.c (flatten_function): New parameter UPDATE.
	(ipa_inline, early_inliner): Use it.

From-SVN: r270446

The removed code ended up setting DECL_INITIAL to the INIT_EXPR returned by
split_nonconstant_init, which makes no sense.  This code was added back in
1996, so any rationale is long lost.

	* decl.c (cp_finish_decl): Don't set DECL_INITIAL of external vars.

From-SVN: r270445

From-SVN: r270444

When testing PR 85164, the baseline bootstrap-ubsan results had
a lot of failures from int_const_binop.  This is because with the
new overflow handling we can sometimes do:

      poly_res = res;

on an uninitialised res.

2019-04-18  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* fold-const.c (int_const_binop): Return early on failure.

From-SVN: r270443

Two fixes for UB when handling very large offsets.  The calculation in
force_int_to_mode would have been correct if signed integers used modulo
arithmetic, so just switch to unsigned types.  The calculation in
rtx_addr_can_trap_p_1 didn't handle overflow properly, so switch to
known_subrange_p instead (which is supposed to handle all cases).

2019-04-18  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	PR middle-end/85164
	* combine.c (force_int_to_mode): Cast the argument rather than
	the result of known_alignment.
	* rtlanal.c (rtx_addr_can_trap_p_1): Use known_subrange_p.

gcc/testsuite/
	PR middle-end/85164
	* gcc.dg/pr85164-1.c, gcc.dg/pr85164-2.c: New tests.

From-SVN: r270442

2019-04-18  Richard Biener  <rguenther@suse.de>

	PR debug/90131
	* tree-cfgcleanup.c (move_debug_stmts_from_forwarder): Split
	out from ...
	(remove_forwarder_block): ... here.
	(remove_forwarder_block_with_phi): Also move debug stmts here.

	* gcc.dg/guality/pr90131.c: New testcase.

From-SVN: r270441

From-SVN: r270439

	PR translation/79183
	* gimple-ssa-sprintf.c (format_directive): Use inform_n instead of
	inform where appropriate.

From-SVN: r270438

2019-04-18  Richard Biener  <rguenther@suse.de>

	* tree.c (get_qualified_type): Put found type variants at the
	head of the variant list.

From-SVN: r270437

2019-04-18  Iain Sandoe  <iain@sandoe.co.uk>

	* MAINTAINERS: Update my email address.

From-SVN: r270436

fix PR89864

      2019-04-18  Erik Schnetter  <schnetter@gmail.com>
	  Jakub Jelinek  <jakub@redhat.com>
	  Iain Sandoe  <iain@sandoe.co.uk>

	PR bootstrap/89864
	* inclhack.def (darwin_ucred__Atomic): New, work around _Atomic keyword
	use in headers included by C++.
	* fixincl.x: Regenerated.


Co-Authored-By: Iain Sandoe <iain@sandoe.co.uk>
Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r270435

	PR go/90110
    compiler: use temporary to avoid early destruction
    
    The code was passing a substr directly to strtol, and then checking
    the *end value returned by strtol.  But the substr could be destroyed
    as soon as strtol returns, making the test of *end invalid.
    
    Also fix an incorrect test of the string index rather than the value.
    
    Fixes https://gcc.gnu.org/PR90110
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/172663

From-SVN: r270434

In order to make alias templates useful for SFINAE we instantiate them under
the prevailing 'complain' argument, so an error encountered while
instantiating during SFINAE context is silent.  The problem in this PR comes
when we later look up the erroneous instantiation and don't give an error at
that point.  Fixed by not adding an erroneous instantiation to the hash
table, so we instantiate it again when needed and get the error.  This
required changes to a number of tests, which previously said "substitution
failed:" with no explanation of what the failure was; now we properly
explain.

	* pt.c (tsubst_decl) [TYPE_DECL]: Don't put an erroneous decl in the
	hash table when we're in SFINAE context.

From-SVN: r270433

From-SVN: r270430

While testing the fix I also discovered that operator== assumes the
elements are comparable with operator!= which is not required.

	PR libstdc++/90105
	* include/bits/forward_list.h (operator==): Do not use operator!= to
	compare elements.
	(forward_list<T, A>::sort(Comp)): When elements are equal take the one
	earlier in the list, so that sort is stable.
	* testsuite/23_containers/forward_list/operations/90105.cc: New test.
	* testsuite/23_containers/forward_list/comparable.cc: Test with
	types that meet the minimum EqualityComparable and LessThanComparable
	requirements. Remove irrelevant comment.

From-SVN: r270427

It is a bit confusing, it looks as if the compiler tried to print
something there.


	* config/rs6000/rs6000.c (rs6000_register_move_cost): Fix typo.

From-SVN: r270426

The standard says the std::variant copy constructor is defined as
deleted unless all alternative types are copy constructible, but we were
making it also depend on move constructible. Fix the condition and
enhance the tests to check the semantics with pathological copy-only
types (i.e. supporting copying but having deleted moves).

The enhanced tests revealed a regression in copy assignment for
non-trivial alternative types, where the assignment would not be
performed because the condition in the _Copy_assign_base visitor is
false: is_same_v<remove_reference_t<T&>, remove_reference_t<const T&>>.

	* include/std/variant (__detail::__variant::_Traits::_S_copy_assign):
	Do not depend on whether all alternative types are move constructible.
	(__detail::__variant::_Copy_assign_base::operator=): Remove cv-quals
	from the operand when deciding whether to perform the assignment.
	* testsuite/20_util/variant/compile.cc (DeletedMoves): Define type
	with deleted move constructor and deleted move assignment operator.
	(default_ctor, copy_ctor, move_ctor, copy_assign, move_assign): Check
	behaviour of variants with DeletedMoves as an alternative.
	* testsuite/20_util/variant/run.cc (DeletedMoves): Define same type.
	(move_ctor, move_assign): Check that moving a variant with a
	DeletedMoves alternative falls back to copying instead of moving.

From-SVN: r270425

The string literal is optional in C++17 and all these are empty so add
no value.

	* testsuite/20_util/variant/compile.cc: Remove empty string literals
	from static_assert declarations.

From-SVN: r270424

	* testsuite/20_util/variant/compile.cc (MoveCtorOnly): Fix type to
	actually match its name.
	(MoveCtorAndSwapOnly): Define new type that adds swap to MoveCtorOnly.
	(test_swap()): Fix result for MoveCtorOnly and check
	MoveCtorAndSwapOnly.

From-SVN: r270423

	PR c++/89325
	* g++.dg/ext/attrib58.C: New test.
	* g++.dg/ext/attrib59.C: New test.
	* g++.dg/ext/attrib60.C: New test.

From-SVN: r270422

	PR target/90125
	* config/i386/avx512fintrin.h (_mm_maskz_fmadd_round_sd,
	_mm_maskz_fmadd_round_ss, _mm_maskz_fmsub_round_sd,
	_mm_maskz_fmsub_round_ss, _mm_maskz_fnmadd_round_sd,
	_mm_maskz_fnmadd_round_ss, _mm_maskz_fnmsub_round_sd,
	_mm_maskz_fnmsub_round_ss): Use _maskz builtin instead of _mask3.

	PR target/90125
	* gcc.target/i386/avx512f-vfmsubXXXss-2.c (avx512f_test): Adjust
	constants to ensure precise result even when not using fma.
	* gcc.target/i386/avx512f-vfnmaddXXXss-2.c (avx512f_test): Likewise.
	* gcc.target/i386/avx512f-vfmaddXXXsd-3.c: New test.
	* gcc.target/i386/avx512f-vfmaddXXXss-3.c: New test.
	* gcc.target/i386/avx512f-vfmsubXXXsd-3.c: New test.
	* gcc.target/i386/avx512f-vfmsubXXXss-3.c: New test.
	* gcc.target/i386/avx512f-vfnmaddXXXsd-3.c: New test.
	* gcc.target/i386/avx512f-vfnmaddXXXss-3.c: New test.
	* gcc.target/i386/avx512f-vfnmsubXXXsd-3.c: New test.
	* gcc.target/i386/avx512f-vfnmsubXXXss-3.c: New test.

From-SVN: r270421

ira-conflicts.c (print_allocno_conflicts): Always print something, even for allocno's with no conflicts.

gcc/
	* ira-conflicts.c (print_allocno_conflicts): Always print something,
	even for allocno's with no conflicts.
	(print_conflicts): Print an extra newline.

From-SVN: r270420

When auto-inc-dec creates a new mem to compute the cost of doing some
transform, it forgets to copy over the alignment of the original mem.
This gives wrong costs, for example, for rs6000 a floating point load
or store is hugely expensive if unaligned.  This patch fixes it.


	* auto-inc-dec.c (attempt_change): Set the alignment of the
	temporary memory to that of the original.

From-SVN: r270419

	* typeck.c (build_class_member_access_expr): Check
	cp_unevaluated_operand.

	* g++.dg/cpp0x/decltype70.C: New test.

From-SVN: r270418

targhooks.c (default_print_patchable_function_entry): Emit __patchable_function_entries section with writable flags to allow...

	* targhooks.c (default_print_patchable_function_entry): Emit
	__patchable_function_entries section with writable flags to allow
	relocation resolution.

From-SVN: r270417

From-SVN: r270416

	* dg-extract-results.sh: Only handle WARNING: program timed out
	lines specially in "$MODE" == "sum".  Restore previous behavior
	for "$MODE" != "sum".  Clear has_timeout and timeout_cnt if in
	a different variant or curfile is empty.
	* dg-extract-results.py: Fix a typo.

From-SVN: r270415

	PR middle-end/90095
	* internal-fn.c (expand_mul_overflow): Don't set SUBREG_PROMOTED_VAR_P
	on lowpart SUBREGs.

	* gcc.dg/pr90095-1.c: New test.
	* gcc.dg/pr90095-2.c: New test.

From-SVN: r270410

In C++1z drafts up to N4606 the constexpr keyword was missing from the
detailed description of this function, despite being shown in the class
synopsis.  That was fixed editorially for N4618, but our implementation
was not corrected to match.

	* include/std/optional (optional::value_or(U&&) &&): Add missing
	constexpr specifier.
	* testsuite/20_util/optional/constexpr/observers/4.cc: Check value_or
	for disengaged optionals and rvalue optionals.
	* testsuite/20_util/optional/observers/4.cc: Likewise.

From-SVN: r270409