doc : Fix build error from r11-4972.

Some tex tools don't allow the @r{} command to be split across
lines.  Fixed by making the change occupy a long line.

gcc/ChangeLog:

* doc/extend.texi: Don't try to line-wrap an @r command.

tree-optimization/97812 - fix range query in VRP assert discovery

This makes sure to properly extend the input range before seeing
whether it fits the target.

2020-11-13  Richard Biener  <rguenther@suse.de>

PR tree-optimization/97812
* tree-vrp.c (register_edge_assert_for_2): Extend the range
according to its sign before seeing whether it fits.

* gcc.dg/torture/pr97812.c: New testcase.

aarch64: Make use of RTL predicates

2020-11-10  Andrea Corallo  <andrea.corallo@arm.com>

* config/aarch64/aarch64.c (tls_symbolic_operand_type)
(aarch64_load_symref_appropriately, aarch64_mov128_immediate)
(aarch64_expand_mov_immediate)
(aarch64_maybe_expand_sve_subreg_move)
(aarch64_tls_referenced_p, aarch64_cannot_force_const_mem)
(aarch64_base_register_rtx_p, aarch64_classify_index)
(aarch64_classify_address, aarch64_symbolic_address_p)
(aarch64_reinterpret_float_as_int, aarch64_float_const_rtx_p)
(aarch64_can_const_movi_rtx_p, aarch64_select_cc_mode)
(aarch64_print_operand, aarch64_label_mentioned_p)
(aarch64_secondary_reload, aarch64_preferred_reload_class)
(aarch64_address_cost, aarch64_tls_symbol_p)
(aarch64_classify_symbol, aarch64_legitimate_pic_operand_p)
(aarch64_legitimate_constant_p)
(aarch64_sve_float_arith_immediate_p)
(aarch64_sve_float_mul_immediate_p, aarch64_mov_operand_p)
(fusion_load_store): Use RTL operands where possible.

libstdc++: Add -pthread options to std::future polling test

For linux targets this test doesn't need -lpthread because it only uses
atomics, but for all other targets std::call_once still needs pthreads.
Add the necessary test directives to make that work.

The timings in this test might be too fragile or too target-specific, so
it might need to be adjusted in future, or restricted to only run on
specific targets. For now I've increased the allowed ratio between
wait_for calls before and after the future is made ready, because it was
failing with -O3 -march=native sometimes.

libstdc++-v3/ChangeLog:

* testsuite/30_threads/future/members/poll.cc: Require gthreads
and add -pthread for targets that require it. Relax required
ratio of wait_for calls before/after the future is ready.

aarch64: Add backend support for expanding __builtin_memset

This patch implements aarch64 backend expansion for __builtin_memset. Most of
the implementation is based on the expansion of __builtin_memcpy. We change the
values of SET_RATIO and MOVE_RATIO for cases where we do not have to strictly
align and where we can benefit from NEON instructions in the backend.

gcc/ChangeLog:

* config/aarch64/aarch64-protos.h (aarch64_expand_setmem): New
declaration.
* config/aarch64/aarch64.c (aarch64_gen_store_pair): Add case for
E_V16QImode.
(aarch64_set_one_block_and_progress_pointer): New helper for
aarch64_expand_setmem.
(aarch64_expand_setmem): Define the expansion for memset.
* config/aarch64/aarch64.h (CLEAR_RATIO): Tweak to favor
aarch64_expand_setmem when allowed and profitable.
(SET_RATIO): Likewise.
* config/aarch64/aarch64.md: Define pattern for setmemdi.

gcc/testsuite/ChangeLog:

* g++.dg/tree-ssa/pr90883.C: Remove xfail for aarch64.
* gcc.dg/tree-prof/stringop-2.c: Add xfail for aarch64.
* gcc.target/aarch64/memset-corner-cases.c: New test.
* gcc.target/aarch64/memset-q-reg.c: New test.

C-Family, Objective-C : Implement Objective-C nullability Part 1[PR90707].

This part of the implementation covers property nullability attributes
and includes the changes to common code. Follow-on changes will be needed
to cover Objective-C method definitions, but those are expected to be
local to the Objective-C front end.

The basis of the implementation is to translate the Objective-C-specific
keywords into an attribute (objc_nullability) which has the required
states to carry the attribute markup.

We introduce the keywords, and these are parsed and validated in the same
manner as other property attributes.  The resulting value is attached to
the property as an objc_nullability attribute.

gcc/c-family/ChangeLog:

PR objc/90707
* c-common.c (c_common_reswords): null_unspecified, nullable,
nonnull, null_resettable: New keywords.
* c-common.h (enum rid): RID_NULL_UNSPECIFIED, RID_NULLABLE,
RID_NONNULL, RID_NULL_RESETTABLE: New.
(OBJC_IS_PATTR_KEYWORD): Include nullability keywords in the
ranges accepted for property attributes.
* c-attribs.c (handle_objc_nullability_attribute): New.
* c-objc.h (enum objc_property_attribute_group): Add
OBJC_PROPATTR_GROUP_NULLABLE.
(enum objc_property_attribute_kind):Add
OBJC_PROPERTY_ATTR_NULL_UNSPECIFIED, OBJC_PROPERTY_ATTR_NULLABLE,
OBJC_PROPERTY_ATTR_NONNULL, OBJC_PROPERTY_ATTR_NULL_RESETTABLE.

gcc/objc/ChangeLog:

PR objc/90707
* objc-act.c (objc_prop_attr_kind_for_rid): Handle nullability.
(objc_add_property_declaration): Handle nullability attributes.
Check that these are applicable to the property type.
* objc-act.h (enum objc_property_nullability): New.

gcc/testsuite/ChangeLog:

PR objc/90707
* obj-c++.dg/property/at-property-4.mm: Add basic nullability
tests.
* objc.dg/property/at-property-4.m: Likewise.
* obj-c++.dg/attributes/nullability-00.mm: New test.
* obj-c++.dg/property/nullability-00.mm: New test.
* objc.dg/attributes/nullability-00.m: New test.
* objc.dg/property/nullability-00.m: New test.

gcc/ChangeLog:

PR objc/90707
* doc/extend.texi: Document the objc_nullability attribute.

Objective-C [3/3] : Implement Wobjc-root-class [PR77404].

Add Wno-objc-root-class where needed to the objective-c++
tests.

gcc/testsuite/ChangeLog:

PR objc/77404
* obj-c++.dg/attributes/class-attribute-1.mm:
Add Wno-objc-root-class.
* obj-c++.dg/attributes/class-attribute-2.mm: Likewise.
* obj-c++.dg/attributes/class-attribute-3.mm: Likewise.
* obj-c++.dg/attributes/method-deprecated-1.mm: Likewise.
* obj-c++.dg/attributes/method-deprecated-2.mm: Likewise.
* obj-c++.dg/attributes/method-deprecated-3.mm: Likewise.
* obj-c++.dg/attributes/method-format-1.mm: Likewise.
* obj-c++.dg/attributes/method-nonnull-1.mm: Likewise.
* obj-c++.dg/attributes/method-noreturn-1.mm: Likewise.
* obj-c++.dg/attributes/method-sentinel-1.mm: Likewise.
* obj-c++.dg/attributes/nsobject-01.mm: Likewise.
* obj-c++.dg/attributes/parameter-attribute-1.mm: Likewise.
* obj-c++.dg/attributes/parameter-attribute-2.mm: Likewise.
* obj-c++.dg/attributes/proto-attribute-1.mm: Likewise.
* obj-c++.dg/attributes/proto-attribute-3.mm: Likewise.
* obj-c++.dg/attributes/proto-attribute-4.mm: Likewise.
* obj-c++.dg/attributes/unused-parameter-1.mm: Likewise.
* obj-c++.dg/bad-receiver-type.mm: Likewise.
* obj-c++.dg/bitfield-3.mm: Likewise.
* obj-c++.dg/bitfield-5.mm: Likewise.
* obj-c++.dg/class-extension-1.mm: Likewise.
* obj-c++.dg/class-extension-2.mm: Likewise.
* obj-c++.dg/class-extension-3.mm: Likewise.
* obj-c++.dg/class-extension-4.mm: Likewise.
* obj-c++.dg/class-protocol-1.mm: Likewise.
* obj-c++.dg/comp-types-1.mm: Likewise.
* obj-c++.dg/comp-types-10.mm: Likewise.
* obj-c++.dg/comp-types-2.mm: Likewise.
* obj-c++.dg/comp-types-3.mm: Likewise.
* obj-c++.dg/comp-types-5.mm: Likewise.
* obj-c++.dg/comp-types-6.mm: Likewise.
* obj-c++.dg/comp-types-7.mm: Likewise.
* obj-c++.dg/comp-types-8.mm: Likewise.
* obj-c++.dg/demangle-2.mm: Likewise.
* obj-c++.dg/demangle-3.mm: Likewise.
* obj-c++.dg/duplicate-class-1.mm: Likewise.
* obj-c++.dg/encode-1-next.mm: Likewise.
* obj-c++.dg/encode-1.mm: Likewise.
* obj-c++.dg/enhanced-proto-2.mm: Likewise.
* obj-c++.dg/exceptions-1.mm: Likewise.
* obj-c++.dg/exceptions-3.mm: Likewise.
* obj-c++.dg/exceptions-4.mm: Likewise.
* obj-c++.dg/exceptions-5.mm: Likewise.
* obj-c++.dg/extern-c-1.mm: Likewise.
* obj-c++.dg/fobjc-std-1.mm: Likewise.
* obj-c++.dg/gnu-api-2-class-meta.mm: Likewise.
* obj-c++.dg/gnu-api-2-class.mm: Likewise.
* obj-c++.dg/gnu-api-2-ivar.mm: Likewise.
* obj-c++.dg/gnu-api-2-method.mm: Likewise.
* obj-c++.dg/gnu-api-2-objc.mm: Likewise.
* obj-c++.dg/gnu-api-2-objc_msg_lookup.mm: Likewise.
* obj-c++.dg/gnu-api-2-object.mm: Likewise.
* obj-c++.dg/gnu-api-2-property.mm: Likewise.
* obj-c++.dg/gnu-api-2-protocol.mm: Likewise.
* obj-c++.dg/gnu-api-2-resolve-method.mm: Likewise.
* obj-c++.dg/gnu-api-2-sel.mm: Likewise.
* obj-c++.dg/invalid-method-2.mm: Likewise.
* obj-c++.dg/ivar-invalid-type-1.mm: Likewise.
* obj-c++.dg/ivar-problem-1.mm: Likewise.
* obj-c++.dg/lto/lto.exp: Likewise.
* obj-c++.dg/lto/trivial-1_0.mm: Likewise.
* obj-c++.dg/method-1.mm: Likewise.
* obj-c++.dg/method-12.mm: Likewise.
* obj-c++.dg/method-18.mm: Likewise.
* obj-c++.dg/method-19.mm: Likewise.
* obj-c++.dg/method-20.mm: Likewise.
* obj-c++.dg/method-3.mm: Likewise.
* obj-c++.dg/method-4.mm: Likewise.
* obj-c++.dg/method-5.mm: Likewise.
* obj-c++.dg/method-8.mm: Likewise.
* obj-c++.dg/method-9.mm: Likewise.
* obj-c++.dg/method-namespace-1.mm: Likewise.
* obj-c++.dg/plugin/diagnostic-test-expressions-1.mm:
Likewise.
* obj-c++.dg/pr23709.mm: Likewise.
* obj-c++.dg/pragma-2.mm: Likewise.
* obj-c++.dg/private-1.mm: Likewise.
* obj-c++.dg/private-2.mm: Likewise.
* obj-c++.dg/property/property.exp: Likewise.
* obj-c++.dg/proto-lossage-1.mm: Likewise.
* obj-c++.dg/proto-lossage-5.mm: Likewise.
* obj-c++.dg/proto-qual-1.mm: Likewise.
* obj-c++.dg/protocol-inheritance-1.mm: Likewise.
* obj-c++.dg/protocol-inheritance-2.mm: Likewise.
* obj-c++.dg/protocol-optional-1.mm: Likewise.
* obj-c++.dg/selector-1.mm: Likewise.
* obj-c++.dg/selector-2.mm: Likewise.
* obj-c++.dg/selector-3.mm: Likewise.
* obj-c++.dg/selector-4.mm: Likewise.
* obj-c++.dg/strings/strings.exp: Likewise.
* obj-c++.dg/stubify-1.mm: Likewise.
* obj-c++.dg/stubify-2.mm: Likewise.
* obj-c++.dg/super-dealloc-1.mm: Likewise.
* obj-c++.dg/super-dealloc-2.mm: Likewise.
* obj-c++.dg/sync-3.mm: Likewise.
* obj-c++.dg/syntax-error-2.mm: Likewise.
* obj-c++.dg/syntax-error-4.mm: Likewise.
* obj-c++.dg/syntax-error-7.mm: Likewise.
* obj-c++.dg/syntax-error-9.mm: Likewise.
* obj-c++.dg/template-4.mm: Likewise.
* obj-c++.dg/template-7.mm: Likewise.
* obj-c++.dg/template-8.mm: Likewise.
* obj-c++.dg/threedotthree-abi-1.mm: Likewise.
* obj-c++.dg/torture/dg-torture.exp: Likewise.
* obj-c++.dg/torture/strings/strings.exp: Likewise.
* obj-c++.dg/try-catch-12.mm: Likewise.
* obj-c++.dg/try-catch-13.mm: Likewise.

Objective-C [2/3] : Implement Wobjc-root-class [PR77404].

Add "Wno-objc-root-class" to tests in the Objective-C suite where
needed.

gcc/testsuite/ChangeLog:

PR objc/77404
* objc.dg/anon-1.m: Add Wno-objc-root-class.
* objc.dg/attributes/class-attribute-1.m: Likewise.
* objc.dg/attributes/class-attribute-2.m: Likewise.
* objc.dg/attributes/class-attribute-3.m: Likewise.
* objc.dg/attributes/method-deprecated-1.m: Likewise.
* objc.dg/attributes/method-deprecated-2.m: Likewise.
* objc.dg/attributes/method-deprecated-3.m: Likewise.
* objc.dg/attributes/method-format-1.m: Likewise.
* objc.dg/attributes/method-nonnull-1.m: Likewise.
* objc.dg/attributes/method-noreturn-1.m: Likewise.
* objc.dg/attributes/method-sentinel-1.m: Likewise.
* objc.dg/attributes/nsobject-01.m: Likewise.
* objc.dg/attributes/objc-exception-1.m: Likewise.
* objc.dg/attributes/parameter-attribute-1.m: Likewise.
* objc.dg/attributes/parameter-attribute-2.m: Likewise.
* objc.dg/attributes/proto-attribute-1.m: Likewise.
* objc.dg/attributes/proto-attribute-2.m: Likewise.
* objc.dg/attributes/proto-attribute-3.m: Likewise.
* objc.dg/attributes/proto-attribute-4.m: Likewise.
* objc.dg/bitfield-2.m: Likewise.
* objc.dg/break-in-ifstmt.m: Likewise.
* objc.dg/class-1.m: Likewise.
* objc.dg/class-extension-1.m: Likewise.
* objc.dg/class-extension-2.m: Likewise.
* objc.dg/class-extension-3.m: Likewise.
* objc.dg/class-extension-4.m: Likewise.
* objc.dg/class-protocol-1.m: Likewise.
* objc.dg/comp-types-7.m: Likewise.
* objc.dg/demangle-1.m: Likewise.
* objc.dg/duplicate-class-1.m: Likewise.
* objc.dg/encode-6-next.m: Likewise.
* objc.dg/encode-6.m: Likewise.
* objc.dg/enhanced-proto-2.m: Likewise.
* objc.dg/exceptions-1.m: Likewise.
* objc.dg/exceptions-3.m: Likewise.
* objc.dg/exceptions-4.m: Likewise.
* objc.dg/exceptions-5.m: Likewise.
* objc.dg/fobjc-std-1.m: Likewise.
* objc.dg/foreach-2.m: Likewise.
* objc.dg/foreach-4.m: Likewise.
* objc.dg/foreach-5.m: Likewise.
* objc.dg/fsyntax-only.m: Likewise.
* objc.dg/gnu-api-2-class-meta.m: Likewise.
* objc.dg/gnu-api-2-class.m: Likewise.
* objc.dg/gnu-api-2-ivar.m: Likewise.
* objc.dg/gnu-api-2-method.m: Likewise.
* objc.dg/gnu-api-2-objc.m: Likewise.
* objc.dg/gnu-api-2-objc_msg_lookup.m: Likewise.
* objc.dg/gnu-api-2-object.m: Likewise.
* objc.dg/gnu-api-2-property.m: Likewise.
* objc.dg/gnu-api-2-protocol.m: Likewise.
* objc.dg/gnu-api-2-resolve-method.m: Likewise.
* objc.dg/gnu-api-2-sel.m: Likewise.
* objc.dg/incomplete-type-1.m: Likewise.
* objc.dg/instancetype-0.m: Likewise.
* objc.dg/invalid-method-2.m: Likewise.
* objc.dg/ivar-invalid-type-1.m: Likewise.
* objc.dg/ivar-problem-1.m: Likewise.
* objc.dg/ivar-scope-1.m: Likewise.
* objc.dg/ivar-scope-2.m: Likewise.
* objc.dg/ivar-scope-4.m: Likewise.
* objc.dg/ivar-visibility-1.m: Likewise.
* objc.dg/ivar-visibility-2.m: Likewise.
* objc.dg/ivar-visibility-3.m: Likewise.
* objc.dg/ivar-visibility-4.m: Likewise.
* objc.dg/local-decl-1.m: Likewise.
* objc.dg/lto/lto.exp: Likewise.
* objc.dg/lto/trivial-1_0.m: Likewise.
* objc.dg/method-1.m: Likewise.
* objc.dg/method-12.m: Likewise.
* objc.dg/method-13.m: Likewise.
* objc.dg/method-14.m: Likewise.
* objc.dg/missing-proto-3.m: Likewise.
* objc.dg/next-runtime-1.m: Likewise.
* objc.dg/objc-foreach-1.m: Likewise.
* objc.dg/objc-foreach-2.m: Likewise.
* objc.dg/objc-foreach-3.m: Likewise.
* objc.dg/objc-nofilename-1.m: Likewise.
* objc.dg/param-1.m: Likewise.
* objc.dg/pch/pch.exp: Likewise.
* objc.dg/plugin/diagnostic-test-expressions-1.m: Likewise.
* objc.dg/pr23709.m: Likewise.
* objc.dg/private-1.m: Likewise.
* objc.dg/private-2.m: Likewise.
* objc.dg/property/property.exp: Likewise.
* objc.dg/proto-hier-1.m: Likewise.
* objc.dg/proto-hier-2.m: Likewise.
* objc.dg/proto-lossage-1.m: Likewise.
* objc.dg/proto-lossage-5.m: Likewise.
* objc.dg/proto-qual-1.m: Likewise.
* objc.dg/protocol-inheritance-1.m: Likewise.
* objc.dg/protocol-inheritance-2.m: Likewise.
* objc.dg/protocol-optional-1.m: Likewise.
* objc.dg/selector-1.m: Likewise.
* objc.dg/selector-2.m: Likewise.
* objc.dg/selector-3.m: Likewise.
* objc.dg/selector-4.m: Likewise.
* objc.dg/shadow-1.m: Likewise.
* objc.dg/shadow-2.m: Likewise.
* objc.dg/special/load-category-1.m: Likewise.
* objc.dg/special/load-category-2.m: Likewise.
* objc.dg/special/load-category-3.m: Likewise.
* objc.dg/special/special.exp: Likewise.
* objc.dg/special/unclaimed-category-1.h: Likewise.
* objc.dg/special/unclaimed-category-1.m: Likewise.
* objc.dg/stabs-1.m: Likewise.
* objc.dg/strings/strings.exp: Likewise.
* objc.dg/stubify-1.m: Likewise.
* objc.dg/stubify-2.m: Likewise.
* objc.dg/super-class-2.m: Likewise.
* objc.dg/super-dealloc-1.m: Likewise.
* objc.dg/super-dealloc-2.m: Likewise.
* objc.dg/sync-3.m: Likewise.
* objc.dg/threedotthree-abi-1.m: Likewise.
* objc.dg/torture/dg-torture.exp: Likewise.
* objc.dg/torture/strings/strings.exp: Likewise.
* objc.dg/try-catch-11.m: Likewise.
* objc.dg/try-catch-12.m: Likewise.
* objc.dg/type-size-2.m: Likewise.
* objc.dg/type-size-3.m: Likewise.
* objc.dg/type-size-4.m: Likewise.
* objc.dg/type-size-5.m: Likewise.
* objc.dg/undeclared-selector.m: Likewise.
* objc.dg/volatile-1.m: Likewise.

C-family, Objective-C [1/3] : Implement Wobjc-root-class [PR77404].

This warning catches the case that the user has left the
superclass specification from a class interface.  Root
classes are, of course, permitted and an attribute is added
to mark these so that the diagnostic is suppressed.

The warning and attribute spellings have been kept in sync
with the language reference implementation (clang).

The diagnostic location information present in the objective-c
interface and class definitions is relatively poor.  This patch
adds a location for the class name to the interface and makes use
of it in existing warnings.

Part 1 is the changes to code and added tests.

Many entries in the testsuite make use of root classes so
there are a large number of mechanical changes there adding
"-Wno-objc-root-class" to the options.

The test changes are parts 2 (objective-c) and 3 (objective-c++)
in the patch series.

gcc/c-family/ChangeLog:

PR objc/77404
* c-attribs.c (handle_objc_root_class_attribute): New
* c-objc.h (objc_start_class_interface): Add a location
value for the position of the class name.
* c.opt: Add Wobjc-root-class.
* stub-objc.c (objc_start_class_interface): Add a location
value for the position of the class name.

gcc/c/ChangeLog:

PR objc/77404
* c-parser.c (c_parser_objc_class_definition): Pass the
location of the class name to the interface declaration.

gcc/cp/ChangeLog:

PR objc/77404
* parser.c (cp_parser_objc_class_interface): Pass the
location of the class name to the interface declaration.

gcc/objc/ChangeLog:

PR objc/77404
* objc-act.c (objc_start_class_interface): Accept the location
of the class name, use it in existing diagnostic.
(start_class): Accept obj_root_class type attributes.  Warn when
the interface for an implementation does not contain a super
class (unless the diagnostic is suppressed by the the command
line flag or the objc_root_class type attribute).

gcc/testsuite/ChangeLog:

PR objc/77404
* objc.dg/attributes/root-class-01.m: New test.
* objc.dg/root-class-00.m: New test.
* obj-c++.dg/attributes/root-class-01.mm: New test.
* obj-c++.dg/root-class-00.mm: New test.

gcc/ChangeLog:

PR objc/77404
* doc/extend.texi: Document the objc_root_class attribute.
* doc/invoke.texi: Document -Wobjc-root-class.

remove almost all users of gimple_expr_code

This replaces the old-school gimple_expr_code with more selective
functions throughout the compiler, in all cases making the code
shorter or more clear.

2020-11-13  Richard Biener  <rguenther@suse.de>

* cfgexpand.c (gimple_assign_rhs_to_tree): Use
gimple_assign_rhs_class.
(expand_gimple_stmt_1): Likewise.
* gimplify-me.c (gimple_regimplify_operands): Use
gimple_assign_single_p.
* ipa-icf-gimple.c (func_checker::compare_gimple_assign):
Remove redundant compare.
(func_checker::compare_gimple_cond): Use gimple_cond_code.
* tree-ssa-tail-merge.c (gimple_equal_p): Likewise.
* predict.c (predict_loops): Use gimple_assign_rhs_code.

Inline delegators in vrp_folder.

gcc/ChangeLog:

* tree-vrp.c (class vrp_folder): Make visit_stmt, visit_phi,
and m_vr_values private.
(vrp_folder::vrp_evaluate_conditional): Remove.
(vrp_folder::vrp_simplify_stmt_using_ranges): Remove.
(vrp_folder::fold_predicate_in): Inline
vrp_evaluate_conditional and vrp_simplify_stmt_using_ranges.
(vrp_folder::fold_stmt): Same.

Move vr_values out of vrp_prop into execute_vrp so it can be shared.

vr_values is being shared among the propagator and the folder and
passed around.  I've pulled it out from the propagator so it can be
passed around to each, instead of being publicly accessible from the
propagator.

gcc/ChangeLog:

* tree-vrp.c (class vrp_prop): Rename vr_values to m_vr_values.
(vrp_prop::vrp_prop): New.
(vrp_prop::initialize): Rename vr_values to m_vr_values.
(vrp_prop::visit_stmt): Same.
(vrp_prop::visit_phi): Same.
(vrp_prop::finalize): Same.
(execute_vrp): Instantiate vrp_vr_values and pass it to folder
and propagator.

Move vrp_prop before vrp_folder.

gcc/ChangeLog:

* tree-vrp.c (class vrp_prop): Move entire class...
(class vrp_folder): ...before here.

Refactor VRP threading code into vrp_jump_threader class.

gcc/ChangeLog:

* tree-vrp.c (identify_jump_threads): Refactor to..
(vrp_jump_threader::vrp_jump_threader): ...here
(vrp_jump_threader::~vrp_jump_threader): ...and here.
(vrp_jump_threader::after_dom_children): Rename vr_values to
m_vr_values.
(execute_vrp): Use vrp_jump_threader.

Group tree-vrp.c by functionality.

Earlier in this cycle there was some work by Giuliano Belinassi and
myself to refactor tree-vrp.c.  A lot of functions and globals were
moved into independent classes, but the haphazard layout remained.
Assertion methods were indispersed with the propagation code, and with
the jump threading code, etc etc.

This series of patches moves things around so that common
functionality is geographically close.  There is no change in
behavior.

I know this is all slated to go in the next release, but finding
things in the current code base, even if just to compare with the
ranger, is difficult.

Since I keep getting bit by aarch64 regressions, I've tested the whole
set of patches on aarch64, as well as individually on x86-64 Linux.

gcc/ChangeLog:

* tree-vrp.c (struct assert_locus): Move.
(class vrp_insert): Rename to vrp_asserts.
(vrp_insert::build_assert_expr_for): Move to vrp_asserts.
(fp_predicate): Same.
(vrp_insert::dump): Same.
(vrp_insert::register_new_assert_for): Same.
(extract_code_and_val_from_cond_with_ops): Move.
(vrp_insert::finish_register_edge_assert_for): Move to vrp_asserts.
(maybe_set_nonzero_bits): Move.
(vrp_insert::find_conditional_asserts): Move to vrp_asserts.
(stmt_interesting_for_vrp): Move.
(struct case_info): Move.
(compare_case_labels): Move.
(lhs_of_dominating_assert): Move.
(find_case_label_index): Move.
(find_case_label_range): Move.
(class vrp_asserts): New.
(vrp_asserts::build_assert_expr_for): Rename from vrp_insert.
(vrp_asserts::dump): Same.
(vrp_asserts::register_new_assert_for): Same.
(vrp_asserts::finish_register_edge_assert_for): Same.
(vrp_asserts::find_conditional_asserts): Same.
(vrp_asserts::compare_case_labels): Same.
(vrp_asserts::find_switch_asserts): Same.
(vrp_asserts::find_assert_locations_in_bb): Same.
(vrp_asserts::find_assert_locations): Same.
(vrp_asserts::process_assert_insertions_for): Same.
(vrp_asserts::compare_assert_loc): Same.
(vrp_asserts::process_assert_insertions): Same.
(vrp_asserts::insert_range_assertions): Same.
(vrp_asserts::all_imm_uses_in_stmt_or_feed_cond): Same.
(vrp_asserts::remove_range_assertions): Same.
(class vrp_prop): Move.
(all_imm_uses_in_stmt_or_feed_cond): Move.
(vrp_prop::vrp_initialize): Move.
(class vrp_folder): Move.
(vrp_folder::fold_predicate_in): Move.
(vrp_folder::fold_stmt): Move.
(vrp_prop::initialize): Move.
(vrp_prop::visit_stmt): Move.
(enum ssa_prop_result): Move.
(vrp_prop::visit_phi): Move.
(vrp_prop::finalize): Move.
(class vrp_dom_walker): Rename to...
(class vrp_jump_threader): ...this.
(vrp_jump_threader::before_dom_children): Rename from
vrp_dom_walker.
(simplify_stmt_for_jump_threading): Rename to...
(vrp_jump_threader::simplify_stmt): ...here.
(vrp_jump_threader::after_dom_children): Same.
(identify_jump_threads): Move.
(vrp_prop::vrp_finalize): Move array bounds setup code to...
(execute_vrp): ...here.

MAINTAINERS: add myself for write after approval

ChangeLog:

2020-11-13  Haochen Gui  <guihaoc@gcc.gnu.org>

* MAINTAINERS (Write After Approval): add myself

Change range_handler, was  Re: Fix gimple_expr_code?

Adjust the range_handler to not use gimple_expr_code/type.

* gimple-range.h (gimple_range_handler): Use gimple_assign and
gimple_cond routines to get type and code.
* range-op.cc (range_op_handler): Check for integral types.

Daily bump.

c++: Don't form a templated TARGET_EXPR in finish_compound_literal

The atom_cache in normalize_atom relies on the assumption that two
equivalent (templated) trees (in the sense of cp_tree_equal) must use
the same template parameters (according to find_template_parameters).

This assumption unfortunately doesn't always hold for TARGET_EXPRs,
because cp_tree_equal ignores an artificial target of a TARGET_EXPR, but
find_template_parameters walks this target (and its DECL_CONTEXT).

Hence two TARGET_EXPRs built by force_target_expr with the same
initializer and under different settings of current_function_decl will
compare equal according to cp_tree_equal, but find_template_parameters
may return a different set of template parameters for them.  This breaks
the below testcase because during normalization we build two such
TARGET_EXPRs (one under current_function_decl=f and another under =g),
and then share the same ATOMIC_CONSTR for the two corresponding atoms,
leading to a crash during satisfaction of g's associated constraints.

This patch works around this issue by removing the source of these
templated TARGET_EXPRs.  The relevant call to get_target_expr_sfinae was
added in r9-6043, and it seems it's no longer necessary (according to
https://gcc.gnu.org/pipermail/gcc-patches/2019-February/517323.html, the
call was added in order to avoid regressing on initlist109.C at the time).

gcc/cp/ChangeLog:

* semantics.c (finish_compound_literal): Don't wrap the original
compound literal in a TARGET_EXPR when inside a template.

gcc/testsuite/ChangeLog:

* g++.dg/cpp2a/concepts-decltype3.C: New test.

libstdc++: Optimise std::future::wait_for and fix futex polling

To poll a std::future to see if it's ready you have to call one of the
timed waiting functions. The most obvious way is wait_for(0s) but this
was previously very inefficient because it would turn the relative
timeout to an absolute one by calling system_clock::now(). When the
relative timeout is zero (or less) we're obviously going to get a time
that has already passed, but the overhead of obtaining the current time
can be dozens of microseconds. The alternative is to call wait_until
with an absolute timeout that is in the past. If you know the clock's
epoch is in the past you can use a default constructed time_point.
Alternatively, using some_clock::time_point::min() gives the earliest
time point supported by the clock, which should be safe to assume is in
the past. However, using a futex wait with an absolute timeout before
the UNIX epoch fails and sets errno=EINVAL. The new code using futex
waits with absolute timeouts was not checking for this case, which could
result in hangs (or killing the process if the libray is built with
assertions enabled).

This patch checks for times before the epoch before attempting to wait
on a futex with an absolute timeout, which fixes the hangs or crashes.
It also makes it very fast to poll using an absolute timeout before the
epoch (because we skip the futex syscall).

It also makes future::wait_for avoid waiting at all when the relative
timeout is zero or less, to avoid the unnecessary overhead of getting
the current time. This makes polling with wait_for(0s) take only a few
cycles instead of dozens of milliseconds.

libstdc++-v3/ChangeLog:

* include/std/future (future::wait_for): Do not wait for
durations less than or equal to zero.
* src/c++11/futex.cc (_M_futex_wait_until)
(_M_futex_wait_until_steady): Do not wait for timeouts before
the epoch.
* testsuite/30_threads/future/members/poll.cc: New test.

jit: add support for inline asm [PR87291]

This patch adds various entrypoints to libgccjit for directly embedding
asm statements into a compile, analogous to inline asm in the C frontend:
  gcc_jit_block_add_extended_asm
  gcc_jit_block_end_with_extended_asm_goto
  gcc_jit_extended_asm_as_object
  gcc_jit_extended_asm_set_volatile_flag
  gcc_jit_extended_asm_set_inline_flag
  gcc_jit_extended_asm_add_output_operand
  gcc_jit_extended_asm_add_input_operand
  gcc_jit_extended_asm_add_clobber
  gcc_jit_context_add_top_level_asm

gcc/jit/ChangeLog:
PR jit/87291
* docs/cp/topics/asm.rst: New file.
* docs/cp/topics/index.rst (Topic Reference): Add it.
* docs/topics/asm.rst: New file.
* docs/topics/compatibility.rst (LIBGCCJIT_ABI_15): New.
* docs/topics/functions.rst (Statements): Add link to extended
asm.
* docs/topics/index.rst (Topic Reference): Add asm.rst.
* docs/topics/objects.rst: Add gcc_jit_extended_asm to ASCII art.
* docs/_build/texinfo/Makefile: Regenerate.
* docs/_build/texinfo/libgccjit.texi: Regenerate.
* jit-common.h (gcc::jit::recording::extended_asm): New forward
decl.
(gcc::jit::recording::top_level_asm): Likewise.
* jit-playback.c: Include "stmt.h".
(build_string): New.
(gcc::jit::playback::context::new_string_literal): Disambiguate
build_string call.
(gcc::jit::playback::context::add_top_level_asm): New.
(build_operand_chain): New.
(build_clobbers): New.
(build_goto_operands): New.
(gcc::jit::playback::block::add_extended_asm): New.
* jit-playback.h (gcc::jit::playback::context::add_top_level_asm):
New decl.
(struct gcc::jit::playback::asm_operand): New struct.
(gcc::jit::playback::block::add_extended_asm): New decl.
* jit-recording.c (gcc::jit::recording::context::dump_to_file):
Dump top-level asms.
(gcc::jit::recording::context::add_top_level_asm): New.
(gcc::jit::recording::block::add_extended_asm): New.
(gcc::jit::recording::block::end_with_extended_asm_goto): New.
(gcc::jit::recording::asm_operand::asm_operand): New.
(gcc::jit::recording::asm_operand::print): New.
(gcc::jit::recording::asm_operand::make_debug_string): New.
(gcc::jit::recording::output_asm_operand::write_reproducer): New.
(gcc::jit::recording::output_asm_operand::print): New.
(gcc::jit::recording::input_asm_operand::write_reproducer): New.
(gcc::jit::recording::input_asm_operand::print): New.
(gcc::jit::recording::extended_asm::add_output_operand): New.
(gcc::jit::recording::extended_asm::add_input_operand): New.
(gcc::jit::recording::extended_asm::add_clobber): New.
(gcc::jit::recording::extended_asm::replay_into): New.
(gcc::jit::recording::extended_asm::make_debug_string): New.
(gcc::jit::recording::extended_asm::write_flags): New.
(gcc::jit::recording::extended_asm::write_clobbers): New.
(gcc::jit::recording::extended_asm_simple::write_reproducer): New.
(gcc::jit::recording::extended_asm::maybe_populate_playback_blocks):
New.
(gcc::jit::recording::extended_asm_goto::extended_asm_goto): New.
(gcc::jit::recording::extended_asm_goto::replay_into): New.
(gcc::jit::recording::extended_asm_goto::write_reproducer): New.
(gcc::jit::recording::extended_asm_goto::get_successor_blocks):
New.
(gcc::jit::recording::extended_asm_goto::maybe_print_gotos): New.
(gcc::jit::recording::extended_asm_goto::maybe_populate_playback_blocks):
New.
(gcc::jit::recording::top_level_asm::top_level_asm): New.
(gcc::jit::recording::top_level_asm::replay_into): New.
(gcc::jit::recording::top_level_asm::make_debug_string): New.
(gcc::jit::recording::top_level_asm::write_to_dump): New.
(gcc::jit::recording::top_level_asm::write_reproducer): New.
* jit-recording.h
(gcc::jit::recording::context::add_top_level_asm): New decl.
(gcc::jit::recording::context::m_top_level_asms): New field.
(gcc::jit::recording::block::add_extended_asm): New decl.
(gcc::jit::recording::block::end_with_extended_asm_goto): New
decl.
(gcc::jit::recording::asm_operand): New class.
(gcc::jit::recording::output_asm_operand): New class.
(gcc::jit::recording::input_asm_operand): New class.
(gcc::jit::recording::extended_asm): New class.
(gcc::jit::recording::extended_asm_simple): New class.
(gcc::jit::recording::extended_asm_goto): New class.
(gcc::jit::recording::top_level_asm): New class.
* libgccjit++.h (gccjit::extended_asm): New forward decl.
(gccjit::context::add_top_level_asm): New.
(gccjit::block::add_extended_asm): New.
(gccjit::block::end_with_extended_asm_goto): New.
(gccjit::extended_asm): New class.
(gccjit::extended_asm::extended_asm): New ctors.
(gccjit::extended_asm::set_volatile_flag): New.
(gccjit::extended_asm::set_inline_flag): New.
(gccjit::extended_asm::add_output_operand): New.
(gccjit::extended_asm::add_input_operand): New.
(gccjit::extended_asm::add_clobber): New.
(gccjit::extended_asm::get_inner_extended_asm): New.
* libgccjit.c (struct gcc_jit_extended_asm): New.
(jit_error): Make "loc" param take a gcc::jit::recording::location *
rather than a gcc_jit_location *.
(gcc_jit_block_add_extended_asm): New entrypoint.
(gcc_jit_block_end_with_extended_asm_goto): New entrypoint.
(gcc_jit_extended_asm_as_object): New entrypoint.
(gcc_jit_extended_asm_set_volatile_flag): New entrypoint.
(gcc_jit_extended_asm_set_inline_flag): New entrypoint.
(gcc_jit_extended_asm_add_output_operand): New entrypoint.
(gcc_jit_extended_asm_add_clobber): New entrypoint.
(gcc_jit_context_add_top_level_asm): New entrypoint.
* libgccjit.h: Add gcc_jit_extended_asm to ASCII art.
(gcc_jit_extended_asm): New typedef.
(LIBGCCJIT_HAVE_ASM_STATEMENTS): New define.
(gcc_jit_block_add_extended_asm): New entrypoint.
(gcc_jit_block_end_with_extended_asm_goto): New entrypoint.
(gcc_jit_extended_asm_as_object): New entrypoint.
(gcc_jit_extended_asm_set_volatile_flag): New entrypoint.
(gcc_jit_extended_asm_set_inline_flag): New entrypoint.
(gcc_jit_extended_asm_add_output_operand): New entrypoint.
(gcc_jit_extended_asm_add_input_operand): New entrypoint.
(gcc_jit_extended_asm_add_clobber): New entrypoint.
(gcc_jit_context_add_top_level_asm): New entrypoint.
* libgccjit.map (LIBGCCJIT_ABI_15): New.

gcc/testsuite/ChangeLog:
PR jit/87291
* jit.dg/jit.exp: Load target-supports-dg.exp.
Set dg-do-what-default.
(jit-dg-test): Set dg-do-what and call dg-get-options, skipping
the test if it's not supported on the given target.
* jit.dg/test-asm.c: New test.
* jit.dg/test-asm.cc: New test.

jit: fix string escaping

This patch fixes a bug in recording::string::make_debug_string in which
'\t' and '\n' were "escaped" by simply prepending a '\', thus emitting
'\' then '\n', rather than '\' then 'n'.  It also removes a hack that
determined if a string is to be escaped by checking for a leading '"',
by instead adding a flag.

gcc/jit/ChangeLog:
* jit-recording.c (recording::context::new_string): Add "escaped"
param and use it when creating the new recording::string instance.
(recording::string::string): Add "escaped" param and use it to
initialize m_escaped.
(recording::string::make_debug_string): Replace check that first
char is double-quote with use of m_escaped.  Fix escaping of
'\t' and '\n'.  Set "escaped" on the result.
* jit-recording.h (recording::context::new_string): Add "escaped"
param.
(recording::string::string): Add "escaped" param.
(recording::string::m_escaped): New field.

gcc/testsuite/ChangeLog:
* jit.dg/test-debug-strings.c (create_code): Add tests of
string literal escaping.

libgccjit.h: fix typo in comment

gcc/jit/ChangeLog:
* libgccjit.h: Fix typo in comment.

RISC-V: Enable ifunc if it was supported in the binutils for linux toolchain.

gcc/
* configure: Regenerated.
* configure.ac: If ifunc was supported in the binutils for
linux toolchain, then set enable_gnu_indirect_function to yes.

c: C2x __has_c_attribute

C2x adds the __has_c_attribute preprocessor operator, similar to C++
__has_cpp_attribute.

GCC implements __has_cpp_attribute as exactly equivalent to
__has_attribute.  (The documentation says they differ regarding the
values returned for standard attributes, but that's actually only a
matter of the particular nonzero value returned not being specified in
the documentation for __has_attribute; the implementation makes no
distinction between the two.)

I don't think having them exactly equivalent is actually correct,
either for __has_cpp_attribute or for __has_c_attribute.
Specifically, I think it is only correct for __has_cpp_attribute or
__has_c_attribute to return nonzero if the given attribute is
supported, with the particular pp-tokens passed to __has_cpp_attribute
or __has_c_attribute, with [[]] syntax, not if it's only accepted in
__attribute__ or with gnu:: added in [[]].  For example, they should
return nonzero for gnu::packed, but zero for plain packed, because
[[gnu::packed]] is accepted but [[packed]] is ignored as not a
standard attribute.

This patch implements that for __has_c_attribute, leaving any changes
to __has_cpp_attribute for the C++ maintainers.  A new
BT_HAS_STD_ATTRIBUTE is added for __has_c_attribute (which I think,
based on the above, would actually be correct to use for
__has_cpp_attribute as well).  The code in c_common_has_attribute that
deals with scopes has its C++ conditional removed; instead, whether
the language is C or C++ is used only to determine the numeric values
returned for standard attributes (and which standard attributes are
handled there at all).  A new argument is passed to
c_common_has_attribute to distinguish BT_HAS_STD_ATTRIBUTE from
BT_HAS_ATTRIBUTE, and that argument is used to stop attributes with no
scope specified from being accepted with __has_c_attribute unless they
are one of the known standard attributes and so handled specially.

Although the standard specify constants ending with 'L' as the values
for the standard attributes, there is no correctness issue with the
lack of code in GCC to add that 'L' to the expansion:
__has_c_attribute and __has_cpp_attribute are expanded in #if after
other macro expansion has occurred, with no semantics being specified
if they occur outside #if, so there is no way for a conforming program
to inspect the exact text of the expansion of those macros, only to
use the resulting pp-number in a #if expression, where long and int
have the same set of values.

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

gcc/
2020-11-12  Joseph Myers  <joseph@codesourcery.com>

* doc/cpp.texi (__has_attribute): Document when scopes are allowed
for C.
(__has_c_attribute): New.

gcc/c-family/
2020-11-12  Joseph Myers  <joseph@codesourcery.com>

* c-lex.c (c_common_has_attribute): Take argument std_syntax.
Allow scope for C.  Handle standard attributes for C.  Do not
accept unscoped attributes if std_syntax and not handled as
standard attributes.
* c-common.h (c_common_has_attribute): Update prototype.

gcc/testsuite/
2020-11-12  Joseph Myers  <joseph@codesourcery.com>

* gcc.dg/c2x-has-c-attribute-1.c, gcc.dg/c2x-has-c-attribute-2.c,
gcc.dg/c2x-has-c-attribute-3.c, gcc.dg/c2x-has-c-attribute-4.c:
New tests.

libcpp/
2020-11-12  Joseph Myers  <joseph@codesourcery.com>

* include/cpplib.h (struct cpp_callbacks): Add bool argument to
has_attribute.
(enum cpp_builtin_type): Add BT_HAS_STD_ATTRIBUTE.
* init.c (builtin_array): Add __has_c_attribute.
(cpp_init_special_builtins): Handle BT_HAS_STD_ATTRIBUTE.
* macro.c (_cpp_builtin_macro_text): Handle BT_HAS_STD_ATTRIBUTE.
Update call to has_attribute for BT_HAS_ATTRIBUTE.
* traditional.c (fun_like_macro): Handle BT_HAS_STD_ATTRIBUTE.

openmp: Implement allocate clause in omp lowering.

For now, task/taskloop constructs aren't handled and C/C++ array reductions
and reductions with task or inscan modifiers need further work.
Instead of calling omp_alloc/omp_free (where the former doesn't have
alignment argument and omp_aligned_alloc is 5.1 only feature), this calls
GOMP_alloc/GOMP_free, so that the library can fail if it would fall back
into NULL (exception is zero length allocations).

2020-11-12  Jakub Jelinek  <jakub@redhat.com>

gcc/
* builtin-types.def (BT_FN_PTR_SIZE_SIZE_PTRMODE): New function type.
* omp-builtins.def (BUILT_IN_GOACC_DECLARE): Move earlier.
(BUILT_IN_GOMP_ALLOC, BUILT_IN_GOMP_FREE): New builtins.
* gimplify.c (gimplify_scan_omp_clauses): Force allocator into a
decl if it is not NULL, INTEGER_CST or decl.
(gimplify_adjust_omp_clauses): Clear GOVD_EXPLICIT on explicit clauses
which are being removed.  Remove allocate clauses for variables not seen
if they are private, firstprivate or linear too.  Call
omp_notice_variable on the allocator otherwise.
(gimplify_omp_for): Handle iterator vars mentioned in allocate clauses
similarly to non-is_gimple_reg iterators.
* omp-low.c (struct omp_context): Add allocate_map field.
(delete_omp_context): Delete it.
(scan_sharing_clauses): Fill it from allocate clauses.  Remove it
if mentioned also in shared clause.
(lower_private_allocate): New function.
(lower_rec_input_clauses): Handle allocate clause for privatized
variables, except for task/taskloop, C/C++ array reductions for now
and task/inscan variables.
(lower_send_shared_vars): Don't consider variables in allocate_map
as shared.
* omp-expand.c (expand_omp_for_generic, expand_omp_for_static_nochunk,
expand_omp_for_static_chunk): Use expand_omp_build_assign instead of
gimple_build_assign + gsi_insert_after.
* builtins.c (builtin_fnspec): Handle BUILTIN_GOMP_ALLOC and
BUILTIN_GOMP_FREE.
* tree-ssa-ccp.c (evaluate_stmt): Handle BUILTIN_GOMP_ALLOC.
* tree-ssa-dce.c (mark_stmt_if_obviously_necessary): Handle
BUILTIN_GOMP_ALLOC.
(mark_all_reaching_defs_necessary_1): Handle BUILTIN_GOMP_ALLOC
and BUILTIN_GOMP_FREE.
(propagate_necessity): Likewise.
gcc/fortran/
* f95-lang.c (ATTR_ALLOC_WARN_UNUSED_RESULT_SIZE_2_NOTHROW_LIST):
Define.
(gfc_init_builtin_functions): Add alloc_size and warn_unused_result
attributes to __builtin_GOMP_alloc.
* types.def (BT_PTRMODE): New primitive type.
(BT_FN_VOID_PTR_PTRMODE, BT_FN_PTR_SIZE_SIZE_PTRMODE): New function
types.
libgomp/
* libgomp.map (GOMP_alloc, GOMP_free): Export at GOMP_5.0.1.
* omp.h.in (omp_alloc): Add malloc and alloc_size attributes.
* libgomp_g.h (GOMP_alloc, GOMP_free): Declare.
* allocator.c (omp_aligned_alloc): New for now static function,
add alignment argument and handle it.
(omp_alloc): Reimplement using omp_aligned_alloc.
(GOMP_alloc, GOMP_free): New functions.
(omp_free): Add ialias.
* testsuite/libgomp.c-c++-common/allocate-1.c: New test.
* testsuite/libgomp.c++/allocate-1.C: New test.

Adjust 'libgomp.oacc-fortran/attach-descriptor-1.f90' for improved location information

Fix-up for commit b71ff8c15f5a7d6b1cc1524b4d27843f0d88dbda "Fortran: improve
location data for OpenACC/OpenMP directives [PR97782]".

libgomp/
PR fortran/97782
* testsuite/libgomp.oacc-fortran/attach-descriptor-1.f90: Adjust.

cgraph: Avoid segfault when attempting to dump NULL clone_info

cgraph_node::materialize_clone segfaulted when I tried compiling
Tramp3D with -fdump-ipa-all because there was no clone_info - IPA-CP
created a clone only for an aggregate constant, adding a note to its
transformation summary but not creating any tree_map nor
param_adjustements.

Fixed with the following obvious extra checks which has passed
bootstrap and testing on x86_64-linux.

gcc/ChangeLog:

2020-11-12  Martin Jambor  <mjambor@suse.cz>

* cgraphclones.c (cgraph_node::materialize_clone): Check that clone
info is not NULL before attempting to dump it.

ipa-cp: Work with time benefits and frequencies in sreals

This patch converts the variables that hold time benefits and
frequencies in IPA-CP from plain integers to sreals, avoiding the need
to cap them to avoid overflows and also fixing a potential underflows.

Size costs corresponding to individual constants are left as ints so
that they do not take up too much space.  Care must be taken that
adding it up does not overflow, especially in the case of
prop_size_cost, because in cases of extremely long chains of lattice
dependencies it can overflow (e.g. in testsuite/gcc.dg/ipa/pr50744.c).
The overall size is already tracked in long ints.

gcc/ChangeLog:

2020-11-11  Martin Jambor  <mjambor@suse.cz>

* ipa-cp.c (class ipcp_value_base): Change the type of
local_time_benefit and prop_time_benefit to sreal.  Adjust the
constructor initializer.
(ipcp_lattice::print): Dump sreals.
(struct caller_statistics): Change the type of freq_sum to sreal.
(gather_caller_stats): Work with sreal freq_sum.
(incorporate_penalties): Work with sreal evaluation.
(good_cloning_opportunity_p): Adjusted for sreal sreal time_benefit
and freq_sum.  Bail out if size_cost is INT_MAX.
(perform_estimation_of_a_value): Work with sreal time_benefit.  Avoid
unnecessary capping.
(estimate_local_effects): Pass sreal time benefit to
good_cloning_opportunity_p without capping it.  Adjust dumping.
(safe_add): If there can be overflow, return INT_MAX.
(propagate_effects): Work with sreal times.
(get_info_about_necessary_edges): Work with sreal frequencies.
(decide_about_value): Likewise and with sreal time benefits.

system: Add WARN_UNUSED_RESULT

I'd like to have the option of marking functions with
__attribute__ ((__warn_unused_result__)), so this patch adds a macro.
And use it for maybe_wrap_with_location, it's always a bug if the
return value is not used, which happened to me and got me confused.

gcc/ChangeLog:

* system.h (WARN_UNUSED_RESULT): Define for GCC >= 3.4.
* tree.h (maybe_wrap_with_location): Add WARN_UNUSED_RESULT.

Compare field offsets in operand_equal_p and OEP_ADDRESS_OF

* fold-const.c (operand_compare::operand_equal_p): Compare field
offsets in operand_equal_p and OEP_ADDRESS_OF.
(operand_compare::hash_operand): Update.

libstdc++: Simplify __numeric_traits definition

This changes the __numeric_traits primary template to assume its
argument is an integer type. For the three floating point types that are
supported by __numeric_traits_floating an explicit specialization of
__numeric_traits chooses the right base class.

This improves the failure mode for using __numeric_traits with an
unsupported type. Previously it would use __numeric_traits_floating as
the base class, and give somewhat obscure errors for trying to access
the static data members. Now it will use __numeric_traits_integer which
has a static_assert to check for supported types.

As a side effect of this change there is no need to instantiate
__conditional_type to decide which base class to use.

libstdc++-v3/ChangeLog:

* include/ext/numeric_traits.h (__numeric_traits): Change
primary template to always derive from __numeric_traits_integer.
(__numeric_traits<float>, __numeric_traits<double>)
(__numeric_traits<long double>): Add explicit specializations.

More PRE compile-time optimizations

This fixes a bug in bitmap_list_view which could end up with
a NULL head->current which makes followup searches fail.  Oops.

It also further optimizes the PRE DFS walk by removing useless
stuff and special-casing bitmaps with just one element for
EXECUTE_IF_AND_IN_BITMAP which makes a quite big difference.

2020-11-12  Richard Biener  <rguenther@suse.de>

* bitmap.c (bitmap_list_view): Restore head->current.
* tree-ssa-pre.c (pre_expr_DFS): Elide expr_visited bitmap.
Special-case value expression bitmaps with one element.
(bitmap_find_leader): Likewise.
(sorted_array_from_bitmap_set): Elide expr_visited bitmap.

Specify reason of -Winvalid-pch warning

gcc/c-family
PR pch/86674
* c-pch.c (c_common_valid_pch): Use cpp_warning with CPP_W_INVALID_PCH
reason to fix -Werror=invalid-pch and -Wno-error=invalid-pch switches.

libcpp
PR pch/86674
* files.c (_cpp_find_file): Use CPP_DL_NOTE not CPP_DL_ERROR in call to
cpp_error.

Add support for copy specifiers in fnspec

* attr-fnspec.h: Update topleve comment.
(attr_fnspec::arg_direct_p): Accept 1...9.
(attr_fnspec::arg_maybe_written_p): Reject 1...9.
(attr_fnspec::arg_copied_to_arg_p): New member function.
* builtins.c (builtin_fnspec): Update fnspec of block copy.
* tree-ssa-alias.c (attr_fnspec::verify): Update.

Fortran: improve location data for OpenACC/OpenMP directives [PR97782]

gcc/fortran/ChangeLog:

PR fortran/97782
* trans-openmp.c (gfc_trans_oacc_construct, gfc_trans_omp_parallel_do,
gfc_trans_omp_parallel_do_simd, gfc_trans_omp_parallel_sections,
gfc_trans_omp_parallel_workshare, gfc_trans_omp_sections
gfc_trans_omp_single, gfc_trans_omp_task, gfc_trans_omp_teams
gfc_trans_omp_target, gfc_trans_omp_target_data,
gfc_trans_omp_workshare): Use code->loc instead of input_location
when building the OMP_/OACC_ construct.

gcc/testsuite/ChangeLog:

PR fortran/97782
* gfortran.dg/goacc/classify-kernels-unparallelized.f95: Move dg-message
one line up.
* gfortran.dg/goacc/classify-kernels.f95: Likewise.

libstdc++: Fix __numeric_traits_integer<__int20> [PR 97798]

The expression used to calculate the maximum value for an integer type
assumes that the number of bits in the value representation is always
sizeof(T) * CHAR_BIT. This is not true for the __int20 type on msp430,
which has only 20 bits in the value representation but 32 bits in the
object representation. This causes an integer overflow in a constant
expression, which is ill-formed.

This problem was already solved by DJ for std::numeric_limits<__int20>
by generalizing the helper macros to use a specified number of bits
instead of assuming sizeof(T) * CHAR_BIT. Then the INT_N_n types can
specify the number of bits using the __GLIBCXX_BITSIZE_INT_N_n macros
that the compiler defines.

I'm using a slightly different approach here. I've replaced the helper
macros entirely, and just expanded the calculations in the initializers
for the static data members. By reordering the data members we can reuse
__is_signed and __digits in the other initializers. This removes the
repetition of expanding __glibcxx_signed(T) and __glibcxx_digits(T)
multiple times in each initializer.

The __is_integer_nonstrict trait now defines a new constant, __width,
which is sizeof(T) * CHAR_BIT by default (defined as an enumerator so
that no storage is needed for a static data member). By specializing
__is_integer_nonstrict for the INT_N types that have padding bits, we
can provide the correct width via the __GLIBCXX_BITSIZE_INT_N_n macros.

libstdc++-v3/ChangeLog:

PR libstdc++/97798
* include/ext/numeric_traits.h (__glibcxx_signed)
(__glibcxx_digits, __glibcxx_min, __glibcxx_max): Remove
macros.
(__is_integer_nonstrict::__width): Define new constant.
(__numeric_traits_integer): Define constants in terms of each
other and __is_integer_nonstrict::__width, rather than the
removed macros.
(_GLIBCXX_INT_N_TRAITS): Macro to define explicit
specializations for non-standard integer types.

Add test case for PR 97799.

gcc/testsuite/ChangeLog:

* gfortran.dg/entry_23.f: New test.

Avoid PRE insert iteration when possible

The following make sure to only iterate PRE insertion when
necessary - which is when AVAIL_OUT of a predecessor of a
block we already visited changed (that's backedge destinations).

To not regress this also makes sure to locally iterate insertion
since even topological sort of expressions isn't enough to
guarantee we get all opportunities of a block in one iteration.
This avoids costly re-compute of the topologically sorted expression
array (more micro-optimization is possible here).

2020-11-12  Richard Biener  <rguenther@suse.de>

* tree-ssa-pre.c (bitmap_value_replace_in_set): Return
whether we have changed anything.
(do_pre_regular_insertion): Get topologically sorted array
of expressions from caller.
(do_pre_partial_partial_insertion): Likewise.
(insert): Compute topologically sorted arrays of expressions
here and locally iterate actual insertion.  Iterate only
when AVAIL_OUT of an already visited block source changed.

aarch64: Fix SVE2 BCAX pattern [PR97730]

This patch adds a missing not to the SVE2 BCAX (Bitwise clear and
exclusive or) pattern, fixing the PR. Since SVE doesn't have an
unpredicated not instruction, we need to use a (vacuously) predicated
not here.

To ensure that the predicate is instantiated correctly (to all 1s) for
the intrinsics, we pull out a separate expander from the define_insn.

From the ISA reference [1]:
> Bitwise AND elements of the second source vector with the
> corresponding inverted elements of the third source vector, then
> exclusive OR the results with corresponding elements of the first
> source vector.

[1] : https://developer.arm.com/docs/ddi0602/g/a64-sve-instructions-alphabetic-order/bcax-bitwise-clear-and-exclusive-or

gcc/ChangeLog:

PR target/97730
* config/aarch64/aarch64-sve2.md (@aarch64_sve2_bcax<mode>):
Change to define_expand, add missing (trivially-predicated) not
rtx to fix wrong code bug.
(*aarch64_sve2_bcax<mode>): New.

gcc/testsuite/ChangeLog:

PR target/97730
* gcc.target/aarch64/sve2/bcax_1.c (OP): Add missing bitwise not
to match correct bcax semantics.
* gcc.dg/vect/pr97730.c: New test.

tree-optimization/97806 - fix PRE expression post order

This fixes the postorder compute for the case of multiple
expression leaders for a value.

2020-11-12  Richard Biener  <rguenther@suse.de>

PR tree-optimization/97806
* tree-ssa-pre.c (pre_expr_DFS): New overload for visiting
values, visiting all leaders for a value.  Use a bitmap
for visited values.
(sorted_array_from_bitmap_set): Walk over values and adjust.

* gcc.dg/pr97806.c: New testcase.

c++: Fix up constexpr CLEANUP_POINT_EXPR and TRY_FINALLY_EXPR handling [PR97790]

As the testcase shows, CLEANUP_POINT_EXPR (and I think TRY_FINALLY_EXPR too)
suffer from the same problem that I was trying to fix in
r10-3597-g1006c9d4395a939820df76f37c7b085a4a1a003f
for CLEANUP_STMT, namely that if in the middle of the body expression of
those stmts is e.g. return stmt, goto, break or continue (something that
changes *jump_target and makes it start skipping stmts), we then skip the
cleanups too, which is not appropriate - the cleanups were either queued up
during the non-skipping execution of the body (for CLEANUP_POINT_EXPR), or
for TRY_FINALLY_EXPR are relevant already after entering the body block.

> Would it make sense to always use a NULL jump_target when evaluating
> cleanups?

I was afraid of that, especially for TRY_FINALLY_EXPR, but it seems that
during constexpr evaluation the cleanups will most often be just very simple
destructor calls (or calls to cleanup attribute functions).
Furthermore, for neither of these 3 tree codes we'll reach that code if
jump_target && *jump_target initially (there is a return NULL_TREE much
earlier for those except for trees that could embed labels etc. in it and
clearly these 3 don't count in that).

2020-11-12  Jakub Jelinek  <jakub@redhat.com>

PR c++/97790
* constexpr.c (cxx_eval_constant_expression) <case CLEANUP_POINT_EXPR,
case TRY_FINALLY_EXPR, case CLEANUP_STMT>: Don't pass jump_target to
cxx_eval_constant_expression when evaluating the cleanups.

* g++.dg/cpp2a/constexpr-dtor9.C: New test.

IBM Z: Fix PR97326: Enable fp compares in vec_cmp

gcc/ChangeLog:

PR target/97326
* config/s390/vector.md: Support vector floating point modes in
vec_cmp.

IBM Z: Rename mode attr tointvec to TOINTVEC

Just a preparation to add a lower-case tointvec.

gcc/ChangeLog:

* config/s390/vector.md: Rename tointvec to TOINTVEC.
* config/s390/vx-builtins.md: Likewise.

dwarf2: Set DW_AT_declaration for undefined fns [PR97060]

If DECL_INITIAL isn't set, we can't emit anything about the body of the
function, so add the declaration attribute.

gcc/ChangeLog:

PR debug/97060
* dwarf2out.c (gen_subprogram_die): It's a declaration
if DECL_INITIAL isn't set.

gcc/testsuite/ChangeLog:

PR debug/97060
* gcc.dg/debug/dwarf2/pr97060.c: New test.

testsuite: Adjust pr96789.c by disabling loop vect

New test gcc.dg/tree-ssa/pr96789.c fails on
arm-none-linux-gnueabihf since loop vectorizer is able to optimize
the two loops which operate on array tmp with load_lanes feature
support, it make dse3 fail to find expected inputs.

As Richard suggested, this patch is to replace option
-ftree-vectorize to -ftree-slp-vectorize -fno-tree-loop-vectorize.

gcc/testsuite/ChangeLog:

* gcc.dg/tree-ssa/pr96789.c: Adjusted by disabling loop
vectorization.

analyzer: precision-of-wording for -Wanalyzer-stale-setjmp-buffer

This patch adds a custom event to paths emitted by
-Wanalyzer-stale-setjmp-buffer highlighting the place where the
pertinent stack frame is popped, and updates the final event in
the path to reference this.

gcc/analyzer/ChangeLog:
* checker-path.h (checker_event::get_id_ptr): New.
* diagnostic-manager.cc (path_builder::path_builder): Add "sd"
param and use it to initialize new field "m_sd".
(path_builder::get_pending_diagnostic): New.
(path_builder::m_sd): New field.
(diagnostic_manager::emit_saved_diagnostic): Pass sd to
path_builder ctor.
(diagnostic_manager::add_events_for_superedge): Call new
maybe_add_custom_events_for_superedge vfunc.
* engine.cc (stale_jmp_buf::stale_jmp_buf): Add "setjmp_point"
param and use it to initialize new field "m_setjmp_point".
Initialize new field "m_stack_pop_event".
(stale_jmp_buf::maybe_add_custom_events_for_superedge): New vfunc
implementation.
(stale_jmp_buf::describe_final_event): New vfunc implementation.
(stale_jmp_buf::m_setjmp_point): New field.
(stale_jmp_buf::m_stack_pop_event): New field.
(exploded_node::on_longjmp): Pass setjmp_point to stale_jmp_buf
ctor.
* pending-diagnostic.h
(pending_diagnostic::maybe_add_custom_events_for_superedge): New
vfunc.

gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/setjmp-5.c: Update expected path output to show
an event where the pertinent stack frame is popped.  Update
expected message from final event to reference this event.

analyzer: warn on invalid shift counts [PR97424]

This patch implements -Wanalyzer-shift-count-negative
and -Wanalyzer-shift-count-overflow, analogous to the C/C++
warnings -Wshift-count-negative and -Wshift-count-overflow, but
implemented via interprocedural path analysis rather than via parsing
in a front end, and thus capable of detecting interprocedural cases that the
warnings implemented in the front ends can miss.

gcc/analyzer/ChangeLog:
PR tree-optimization/97424
* analyzer.opt (Wanalyzer-shift-count-negative): New.
(Wanalyzer-shift-count-overflow): New.
* region-model.cc (class shift_count_negative_diagnostic): New.
(class shift_count_overflow_diagnostic): New.
(region_model::get_gassign_result): Complain about shift counts that
are negative or are >= the operand's type's width.

gcc/ChangeLog:
PR tree-optimization/97424
* doc/invoke.texi (Static Analyzer Options): Add
-Wno-analyzer-shift-count-negative and
-Wno-analyzer-shift-count-overflow.
(-Wno-analyzer-shift-count-negative): New.
(-Wno-analyzer-shift-count-overflow): New.

gcc/testsuite/ChangeLog:
PR tree-optimization/97424
* gcc.dg/analyzer/invalid-shift-1.c: New test.

Daily bump.

CFI-handling : Add a hook to allow target-specific Personality and LSDA indirections.

At present, the output of .cfi_personality and .cfi_lsda assumes
ELF semantics for indirections.  This isn't suitable for all targets
and is one blocker to moving Darwin to use .cfi_xxxx.

The patch adds a target hook that allows non-ELF targets to use
indirections appropriate to their needs.

gcc/ChangeLog:

* config/darwin-protos.h (darwin_make_eh_symbol_indirect): New.
* config/darwin.c (darwin_make_eh_symbol_indirect): New. Use
Mach-O semantics for personality and ldsa indirections.
* config/darwin.h (TARGET_ASM_MAKE_EH_SYMBOL_INDIRECT): New.
* doc/tm.texi: Regenerate.
* doc/tm.texi.in: Add TARGET_ASM_MAKE_EH_SYMBOL_INDIRECT hook.
* dwarf2out.c (dwarf2out_do_cfi_startproc): If the target defines
a hook for indirecting personality and ldsa references, use that
otherwise default to ELF semantics.
* target.def (make_eh_symbol_indirect): New target hook.

Objective-C++ : Allow prefix attrs on linkage specs.

For Objective-C++, this combines prefix attributes from before and
after top level linkage specs.  The "reference implementation" for
Objective-C++ allows this, and system headers depend on it.

e.g.

__attribute__((__deprecated__))
extern "C" __attribute__((__visibility__("default")))
@interface MyClass
...
@end

Would consider the list of prefix attributes to the interface for
MyClass to include both the visibility and deprecated ones.

When we are compiling regular C++, this emits a warning and discards
any prefix attributes before a linkage spec.

gcc/cp/ChangeLog:

* parser.c (cp_parser_declaration): Unless we are compiling for
Ojective-C++, warn about and discard any attributes that prefix
a linkage specification.

c++: Change the mangling of __alignof__ [PR88115]

This patch changes the mangling of __alignof__ to v111__alignof__,
making its mangling distinct from that of alignof(type) and
alignof(expr).

How we mangle ALIGNOF_EXPR now depends on its ALIGNOF_EXPR_STD_P flag,
which after the previous patch gets consistently set for alignof(type)
as well as alignof(expr).

gcc/c-family/ChangeLog:

PR c++/88115
* c-opts.c (c_common_post_options): Update latest_abi_version.

gcc/ChangeLog:

PR c++/88115
* common.opt (-fabi-version): Document =15.
* doc/invoke.texi (C++ Dialect Options): Likewise.

gcc/cp/ChangeLog:

PR c++/88115
* mangle.c (write_expression): Mangle __alignof_ differently
from alignof when the ABI version is at least 15.

libiberty/ChangeLog:

PR c++/88115
* cp-demangle.c (d_print_comp_inner)
<case DEMANGLE_COMPONENT_EXTENDED_OPERATOR>: Don't print the
"operator " prefix for __alignof__.
<case DEMANGLE_COMPONENT_UNARY>: Always print parens around the
operand of __alignof__.
* testsuite/demangle-expected: Test demangling for __alignof__.

gcc/testsuite/ChangeLog:

PR c++/88115
* g++.dg/abi/macro0.C: Adjust.
* g++.dg/cpp0x/alignof7.C: New test.
* g++.dg/cpp0x/alignof8.C: New test.

c++: Correct the handling of alignof(expr) [PR88115]

We're currently neglecting to set the ALIGNOF_EXPR_STD_P flag on an
ALIGNOF_EXPR when its operand is an expression.  This leads to us
handling alignof(expr) as if it were written __alignof__(expr), and
returning the preferred alignment instead of the ABI alignment.  In the
testcase below, this causes the first and third static_assert to fail on
x86.

gcc/cp/ChangeLog:

PR c++/88115
* cp-tree.h (cxx_sizeof_or_alignof_expr): Add bool parameter.
* decl.c (fold_sizeof_expr): Pass false to
cxx_sizeof_or_alignof_expr.
* parser.c (cp_parser_unary_expression): Pass std_alignof to
cxx_sizeof_or_alignof_expr.
* pt.c (tsubst_copy): Pass false to cxx_sizeof_or_alignof_expr.
(tsubst_copy_and_build): Pass std_alignof to
cxx_sizeof_or_alignof_expr.
* typeck.c (cxx_alignof_expr): Add std_alignof bool parameter
and pass it to cxx_sizeof_or_alignof_type.  Set ALIGNOF_EXPR_STD_P
appropriately.
(cxx_sizeof_or_alignof_expr): Add std_alignof bool parameter
and pass it to cxx_alignof_expr.  Assert op is either
SIZEOF_EXPR or ALIGNOF_EXPR.

libcc1/ChangeLog:

PR c++/88115
* libcp1plugin.cc (plugin_build_unary_expr): Pass true to
cxx_sizeof_or_alignof_expr.

gcc/testsuite/ChangeLog:

PR c++/88115
* g++.dg/cpp0x/alignof6.C: New test.

c++: Tweak tsubst_qualified_id location.

Retain the location when tsubstituting a qualified-id so that our
static_assert diagnostic can benefit.  Don't create useless location
wrappers for temporary variables.

gcc/ChangeLog:

PR c++/97518
* tree.c (maybe_wrap_with_location): Don't add a location
wrapper around an artificial and ignored decl.

gcc/cp/ChangeLog:

PR c++/97518
* pt.c (tsubst_qualified_id): Use EXPR_LOCATION of the qualified-id.
Use it to maybe_wrap_with_location the final expression.

gcc/testsuite/ChangeLog:

PR c++/97518
* g++.dg/diagnostic/static_assert3.C: New test.

Fix PRE NEW_SETS guarding

Accesses to NEW_SETS should be properly guarded.  Committed
as obvious.

2020-11-11  Richard Biener  <rguenther@suse.de>

PR tree-optimization/97623
* tree-ssa-pre.c (create_expression_by_pieces): Guard
NEW_SETS access.
(insert_into_preds_of_block): Likewise.

libstdc++: Exclude cygwin and mingw from linker relro support

PE format does not have ELF style relro linker support, exclude
from checking. If the host linker supports ELF format, configure
may get confused.

libstdc++-v3/ChangeLog:

* acinclude.m4 (GLIBCXX_CHECK_LINKER_FEATURES): Exclude
cygwin and mingw from relro linker test.
* configure: Regenerate.

Fix PRE topological expression set sorting

This fixes sorted_array_from_bitmap_set to do a topological sort
as required by re-using what PHI-translation does, namely a DFS
walk with the help of bitmap_find_leader.  The proper result
is verified by extra checking in clean () (which would have tripped
before) and for the testcase I'm working at during the last
patches (PR97623) it is neutral in compile-time cost.

2020-11-11  Richard Biener  <rguenther@suse.de>

* tree-ssa-pre.c (pre_expr_DFS): New function.
(sorted_array_from_bitmap_set): Use it to properly
topologically sort the expression set.
(clean): Verify we've cleaned everything we should.

testsuite: Fix up scan-tree-dump-times regexps for 64-bit targets

The added (?:_ull) match on 32-bit targets, but are equivalent to just
adding _ull into the strings, i.e. require the _ull substrings, while
the intent is that they are optional, so we should use (?:_ull)? instead.

2020-11-11  Jakub Jelinek  <jakub@redhat.com>

* gfortran.dg/gomp/workshare-reduction-3.f90: Use (?:_ull)? instead
of (?:_ull) in the scan-tree-dump-times directives.
* gfortran.dg/gomp/workshare-reduction-26.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-27.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-28.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-36.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-37.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-38.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-39.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-40.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-41.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-42.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-43.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-44.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-45.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-46.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-47.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-56.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-57.f90: Likewise.

Remove superfluous call to Base_Type

gcc/ada/ChangeLog:
* gcc-interface/gigi.h: Remove ^L characters throughout.
* gcc-interface/decl.c: Likewise.
* gcc-interface/utils.c: Likewise.
* gcc-interface/utils2.c: Likewise.
* gcc-interface/trans.c (gnat_to_gnu) <N_Allocator>: Do not explicitly
go to the base type for the Has_Constrained_Partial_View flag.

Fix biased integer arithmetic

The Ada compiler uses a biased representation when a size clause reserves
fewer bits than normal either for the lower or for the upper bound.

gcc/ada/ChangeLog:
* gcc-interface/trans.c (build_binary_op_trapv): Convert operands
to the result type before doing generic overflow checking.

gcc/testsuite/ChangeLog:
* gnat.dg/bias2.adb: New test.

Fix segfault on elaboration of empty 1-element array at -O

This is a rather obscure case where the elaboration of an empty array
whose base type is an array type of length at most 1 goes awry when
the code is compiled with optimization.

gcc/ada/ChangeLog:
* gcc-interface/trans.c (can_be_lower_p): Remove.
(Regular_Loop_to_gnu): Add ENTRY_COND unconditionally if
BOTTOM_COND is non-zero.

gcc/testsuite/ChangeLog:
* gnat.dg/opt89.adb: New test.

Fix internal error on chain of constants with -gnatc

gcc/ada/ChangeLog:
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Constant>: In case
the constant is not being defined, get the expression in type
annotation mode only if its type is elementary.

Fix internal error with Shift_Right operator on signed type

This is a regression present on the mainline and 10 branch in the form
of an ICE with a shift operator applied to a variable of a signed type,
and which is caused by a type mismatch.

gcc/ada/ChangeLog:
* gcc-interface/trans.c (gnat_to_gnu) <N_Op_Shift>: Also convert
GNU_MAX_SHIFT if the type of the operation has been changed.
* gcc-interface/utils.c (can_materialize_object_renaming_p): Add
pair of missing parentheses.

gcc/testsuite/ChangeLog:
* gnat.dg/shift1.adb: New test.

testsuite/97797 - adjust GIMPLE tests for sizetype

Tested on x86_64-unknown-linux-gnu, pushed.

2020-11-11  Richard Biener  <rguenther@suse.de>

PR testsuite/97797
* gcc.dg/torture/ssa-fre-5.c: Use __SIZETYPE__ where
appropriate.
* gcc.dg/torture/ssa-fre-6.c: Likewise.

tree-optimization/97623 - Avoid PRE hoist insertion iteration

The recent previous change in this area limited hoist insertion
iteration via a param but the following is IMHO better since
we are not really interested in PRE opportunities exposed by
hoisting but only the other way around.  So this moves hoist
insertion after PRE iteration finished and removes hoist
insertion iteration alltogether.

2020-11-11  Richard Biener  <rguenther@suse.de>

PR tree-optimization/97623
* params.opt (-param=max-pre-hoist-insert-iterations): Remove
again.
* doc/invoke.texi (max-pre-hoist-insert-iterations): Likewise.
* tree-ssa-pre.c (insert): Move hoist insertion after PRE
insertion iteration and do not iterate it.

* gcc.dg/tree-ssa/ssa-hoist-3.c: Adjust.
* gcc.dg/tree-ssa/ssa-hoist-7.c: Likewise.
* gcc.dg/tree-ssa/ssa-pre-30.c: Likewise.

aarch64: Support SVE comparisons for unpacked integers

This patch adds support for comparing unpacked SVE integer vectors,
such as byte elements stored in the bottom bytes of halfword
containers.  It also adds support for selects between unpacked
SVE vectors (both integer and floating-point), since selects and
compares are closely tied via the vcond optab interface.

gcc/
* config/aarch64/aarch64-sve.md (@vcond_mask_<mode><vpred>): Extend
from SVE_FULL to SVE_ALL.
(*vcond_mask_<mode><vpred>): Likewise.
(@aarch64_sel_dup<mode>): Likewise.
(vcond<SVE_FULL:mode><v_int_equiv>): Extend to...
(vcond<SVE_ALL:mode><SVE_I:mode>): ...this, but requiring the
sizes of the container modes to match.
(vcondu<SVE_FULL:mode><v_int_equiv>): Extend to...
(vcondu<SVE_ALL:mode><SVE_I:mode>): ...this.
(vec_cmp<SVE_FULL_I:mode><vpred>): Extend to...
(vec_cmp<SVE_I:mode><vpred>): ...this.
(vec_cmpu<SVE_FULL_I:mode><vpred>): Extend to...
(vec_cmpu<SVE_I:mode><vpred>): ...this.
(@aarch64_pred_cmp<cmp_op><SVE_FULL_I:mode>): Extend to...
(@aarch64_pred_cmp<cmp_op><SVE_I:mode>): ...this.
(*cmp<cmp_op><SVE_FULL_I:mode>_cc): Extend to...
(*cmp<cmp_op><SVE_I:mode>_cc): ...this.
(*cmp<cmp_op><SVE_FULL_I:mode>_ptest): Extend to...
(*cmp<cmp_op><SVE_I:mode>_ptest): ...this.
(*cmp<cmp_op><SVE_FULL_I:mode>_and): Extend to...
(*cmp<cmp_op><SVE_I:mode>_and): ...this.

gcc/testsuite/
* gcc.target/aarch64/sve/cmp_1.c: New test.
* gcc.target/aarch64/sve/cmp_2.c: Likewise.
* gcc.target/aarch64/sve/cond_arith_1.c: Add --param
aarch64-sve-compare-costs=0
* gcc.target/aarch64/sve/cond_arith_1_run.c: Likewise.
* gcc.target/aarch64/sve/cond_arith_3.c: Likewise.
* gcc.target/aarch64/sve/cond_arith_3_run.c: Likewise.
* gcc.target/aarch64/sve/mask_gather_load_7.c: Likewise.
* gcc.target/aarch64/sve/mask_load_slp_1.c: Likewise.
* gcc.target/aarch64/sve/vcond_11.c: Likewise.
* gcc.target/aarch64/sve/vcond_11_run.c: Likewise.

vect: Allow vconds between different vector sizes

The vcond code requires the compared vectors and the selected
vectors to have both the same size and the same number of elements
as each other.  But the operation makes logical sense even for
different vector sizes.  E.g. you could compare two V4SIs and
use the result to select between two V4DIs.

The underlying optab already allows the compared mode and the selected
mode to be specified separately.  Since the vectoriser now also
supports mixed vector sizes, I think we can simply remove the
equal-size check and just keep the equal-lanes check.  It's then
up to the target to decide which (if any) mixtures of sizes it
supports.

gcc/
* optabs-tree.c (expand_vec_cond_expr_p): Allow the compared values
and the selected values to have different mode sizes.
* gimple-isel.cc (gimple_expand_vec_cond_expr): Likewise.

libstdc++: Assigning to a joinable std::jthread calls std::terminate

Move assigning to a std::jthread that represents a thread of execution
needs to send a stop request and join that running thread. Otherwise the
std::thread data member will terminate in its assignment operator.

Co-authored-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:

* include/std/thread (jthread::operator=(jthread&&)): Transfer
any existing state to a temporary that will request a stop and
then join.
* testsuite/30_threads/jthread/jthread.cc: Test move assignment.

libstdc++: Use helper type for checking thread ID

This encapsulates the storing and checking of the thread ID into a class
type, so that the macro _GLIBCXX_HAS_GTHREADS is only checked in one
place. The code doing the checks just calls member functions of the new
type, without caring whether that really does any work or not.

libstdc++-v3/ChangeLog:

* include/std/stop_token (_Stop_state_t::_M_requester): Define
new struct with members to store and check the thread ID.
(_Stop_state_t::_M_request_stop()): Use _M_requester._M_set().
(_Stop_state_t::_M_remove_callback(_Stop_cb*)): Use
_M_requester._M_is_current_thread().

Support Intel AVX VNNI

2020-10-13  Hongtao Liu  <hongtao.liu@intel.com>
    Hongyu Wang  <hongyu.wang@intel.com>

gcc/
* common/config/i386/cpuinfo.h (get_available_features):
Detect AVXVNNI.
* common/config/i386/i386-common.c
(OPTION_MASK_ISA2_AVXVNNI_SET,
OPTION_MASK_ISA2_AVXVNNI_UNSET): New.
(OPTION_MASK_ISA2_AVX2_UNSET): Add AVXVNNI.
(ix86_hanlde_option): Handle -mavxvnni, unset avxvnni when
avx2 is disabled.
* common/config/i386/i386-cpuinfo.h (enum processor_features):
Add FEATURE_AVXVNNI.
* common/config/i386/i386-isas.h: Add ISA_NAMES_TABLE_ENTRY
for avxvnni.
* config.gcc: Add avxvnniintrin.h.
* config/i386/avx512vnnivlintrin.h: Reimplement 128/256 bit non-mask
intrinsics with macros to support unified interface.
* config/i386/avxvnniintrin.h: New header file.
* config/i386/cpuid.h (bit_AVXVNNI): New.
* config/i386/i386-builtins.c (def_builtin): Handle AVXVNNI mask
for unified builtin.
* config/i386/i386-builtin.def (BDESC): Adjust AVX512VNNI
builtins for AVXVNNI.
* config/i386/i386-c.c (ix86_target_macros_internal): Define
__AVXVNNI__.
* config/i386/i386-expand.c (ix86_expand_builtin): Handle bisa
for AVXVNNI to support unified intrinsic name, since there is no
dependency between AVX512VNNI and AVXVNNI.
* config/i386/i386-options.c (isa2_opts): Add -mavxvnni.
(ix86_valid_target_attribute_inner_p): Handle avxnnni.
(ix86_option_override_internal): Ditto.
* config/i386/i386.h (TARGET_AVXVNNI, TARGET_AVXVNNI_P,
TARGET_AVXVNNI_P, PTA_AVXVNNI): New.
(PTA_SAPPHIRERAPIDS): Add AVX_VNNI.
(PTA_ALDERLAKE): Likewise.
* config/i386/i386.md ("isa"): Add avxvnni, avx512vnnivl.
("enabled"): Adjust for avxvnni and avx512vnnivl.
* config/i386/i386.opt: Add option -mavxvnni.
* config/i386/immintrin.h: Include avxvnniintrin.h.
* config/i386/sse.md (vpdpbusd_<mode>): Adjust for AVXVNNI.
(vpdpbusds_<mode>): Likewise.
(vpdpwssd_<mode>): Likewise.
(vpdpwssds_<mode>): Likewise.
(vpdpbusd_v16si): New.
(vpdpbusds_v16si): Likewise.
(vpdpwssd_v16si): Likewise.
(vpdpwssds_v16si): Likewise.
* doc/invoke.texi: Document -mavxvnni.
* doc/extend.texi: Document avxvnni.
* doc/sourcebuild.texi: Document target avxvnni.

gcc/testsuite/

* gcc.target/i386/avx512vl-vnni-1.c: Rename..
* gcc.target/i386/avx512vl-vnni-1a.c: To This.
* gcc.target/i386/avx512vl-vnni-1b.c: New test.
* gcc.target/i386/avx512vl-vnni-2.c: Ditto.
* gcc.target/i386/avx512vl-vnni-3.c: Ditto.
* gcc.target/i386/avx-vnni-1.c: Ditto.
* gcc.target/i386/avx-vnni-2.c: Ditto.
* gcc.target/i386/avx-vnni-3.c: Ditto.
* gcc.target/i386/avx-vnni-4.c: Ditto.
* gcc.target/i386/avx-vnni-5.c: Ditto.
* gcc.target/i386/avx-vnni-6.c: Ditto.
* gcc.target/i386/avx-vpdpbusd-2.c: Ditto.
* gcc.target/i386/avx-vpdpbusds-2.c: Ditto.
* gcc.target/i386/avx-vpdpwssd-2.c: Ditto.
* gcc.target/i386/avx-vpdpwssds-2.c: Ditto.
* gcc.target/i386/vnni_inline_error.c: Ditto.
* gcc.target/i386/avx512vnnivl-builtin.c: Ditto.
* gcc.target/i386/avxvnni-builtin.c: Ditto.
* gcc.target/i386/funcspec-56.inc: Add new target attribute.
* gcc.target/i386/sse-12.c: Add -mavxvnni.
* gcc.target/i386/sse-13.c: Ditto.
* gcc.target/i386/sse-14.c: Ditto.
* gcc.target/i386/sse-22.c: Ditto.
* gcc.target/i386/sse-23.c: Ditto.
* g++.dg/other/i386-2.C: Ditto.
* g++.dg/other/i386-3.C: Ditto.
* lib/target-supports.exp (check_effective_target_avxvnni):
New proc.

Fix spelling.

gcc/ChangeLog:

* tree.c (copy_node): Fix spelling.

Drop topological sort for PRE phi-translation

The topological sort sorted_array_from_bitmap_set is supposed to
provide isn't one since quite some time since value_ids are
assigned first to SSA names in the order of SSA_NAME_VERSION
and then to hashtable entries in the order they appear in the
table.  One can even argue that expression-ids provide a closer
approximation of a topological sort since those are assigned
during AVAIL_OUT computation which is done in a dominator walk.

Now - phi-translation is not even depending on topological sorting
but it essentially does a DFS walk, phi-translating expressions
it depends on and relying on phi-translation caching to avoid
doing redundant work.

So this patch drops the use of sorted_array_from_bitmap_set from
phi_translate_set because this function is quite expensive.

2020-11-11  Richard Biener  <rguenther@suse.de>

* tree-ssa-pre.c (phi_translate_set): Do not sort the
expression set topologically.

Early exit on VR_VARYING from irange::set.

gcc/ChangeLog:

* value-range.cc (irange::set): Early exit on VR_VARYING.

AArch64: Add FLAG for arithmetic operation intrinsics [PR94442]

2020-11-11  Zhiheng Xie  <xiezhiheng@huawei.com>
    Nannan Zheng  <zhengnannan@huawei.com>

gcc/ChangeLog:

* config/aarch64/aarch64-simd-builtins.def: Add proper FLAG
for arithmetic operation intrinsics.

gfortran.dg/gomp/workshare-reduction-*.f90: Fix dumps for -m32

gcc/testsuite/ChangeLog:

* gfortran.dg/gomp/workshare-reduction-26.f90: Add (?:_ull) to
scan-tree-dump-times regex for -m32.
* gfortran.dg/gomp/workshare-reduction-27.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-28.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-3.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-36.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-37.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-38.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-39.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-40.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-41.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-42.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-43.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-44.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-45.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-46.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-47.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-56.f90: Likewise.
* gfortran.dg/gomp/workshare-reduction-57.f90: Likewise.

fortran: Fix up gfc_typename CHARACTER length handling [PR97768]

The first testcase below ICEs when f951 is 32-bit (or 64-bit big-endian).
The problem is that ex->ts.u.cl && ex->ts.u.cl->length are both non-NULL,
but ex->ts.u.cl->length->expr_type is not EXPR_CONSTANT, but EXPR_FUNCTION.
value.function.actual and value.function.name are in that case pointers,
but value._mp_alloc and value._mp_size are 4 byte integers no matter what.
So, in 64-bit little-endian the function returns most of the time incorrect
CHARACTER(0) because the most significant 32 bits of the
value.function.actual pointer are likely 0.
Anyway, the following patch is an attempt to get all the cases right.
Uses ex->value.character.length only for ex->expr_type == EXPR_CONSTANT
(i.e. CHARACTER literals), handles the deferred lengths, assumed lengths,
known constant lengths and finally if the length is something other,
just doesn't print it, i.e. prints just CHARACTER (for default kind)
or CHARACTER(KIND=4) (for e.g. kind 4).

2020-11-11  Jakub Jelinek  <jakub@redhat.com>

PR fortran/97768
gcc/fortran/
* misc.c (gfc_typename): Use ex->value.character.length only if
ex->expr_type == EXPR_CONSTANT.  If ex->ts.deferred, print : instead
of length.  If ex->ts.u.cl && ex->ts.u.cl->length == NULL, print *
instead of length.  Otherwise if character length is non-constant,
print just CHARACTER or CHARACTER(KIND=N).
gcc/testsuite/
* gfortran.dg/pr97768_1.f90: New test.
* gfortran.dg/pr97768_2.f90: New test.

Re: Refactor copying decl section names

* go-gcc.cc (Gcc_backend::global_variable_set_init): Cast NULL to
avoid ambiguous overloaded call.

Improve efficiency of copying section from another tree

gcc/
* cgraph.h (symtab_node::set_section_for_node): Declare new
overload.
(symtab_node::set_section_from_string): Rename from set_section.
(symtab_node::set_section_from_node): Declare.
* symtab.c (symtab_node::set_section_for_node): Define new
overload.
(symtab_node::set_section_from_string): Rename from set_section.
(symtab_node::set_section_from_node): Define.
(symtab_node::set_section): Call renamed set_section_from_string.
(symtab_node::set_section): Call new set_section_from_node.

Refactor section name ref counting

gcc/

* symtab.c (symtab_node::set_section_for_node): Extract reference
counting logic into ...
(retain_section_hash_entry): ... here (new function) and ...
(release_section_hash_entry): ... here (new function).

Formatting, there should be a space between PTA_* and (.

gcc/ChangeLog
* config/i386/i386.h (PTA_MOVDIRI, PTA_MOVDIR64B,
PTA_AMX_TILE, PTA_AMX_INT8, PTA_AMX_BF16, PTA_HRESET):
Formatting.

Update MicroBlaze strings test

gcc/testsuite

* gcc.target/microblaze/others/strings1.c: Update
to include $LC label.

testsuite: skip zero-scratch-regs on powerpc.

These tests are unsupported on PowerPC.

gcc/testsuite/ChangeLog:

* c-c++-common/zero-scratch-regs-10.c: Skip on powerpc*-*-*.
* c-c++-common/zero-scratch-regs-11.c: Skip on powerpc*-*-*.
* c-c++-common/zero-scratch-regs-5.c: Skip on powerpc*-*-aix*.
* c-c++-common/zero-scratch-regs-8.c: Skip on powerpc*-*-*.
* c-c++-common/zero-scratch-regs-9.c: Skip on powerpc*-*-*.

libstdc++: Implement std::emit_on_flush etc.

This adds the manipulators for use with basic_osyncstream. In order to
detect when an arbitrary basic_ostream<C,T> is the base class of a
basic_syncbuf<C,T,A> object, introduce a new intermediate base class
that stores the data members. The new base class stores a pointer and
two bools, which wastes (sizeof(void*) - 2) bytes of padding. It would
be possible to use the two least significant bits of the pointer for the
two bools, at least for targets where alignof(basic_streambuf) > 2, but
that's left as a possible change for a future date.

Also define basic_syncbuf::overflow to override the virtual function in
the base class, so that single characters can be inserted into the
stream buffer. Previously the default basic_streambuf::overflow
implementation was used, which drops the character on the floor.

libstdc++-v3/ChangeLog:

* include/std/ostream (__syncbuf_base): New class template.
(emit_on_flush, noemit_on_flush, flush_emit): New manipulators.
* include/std/syncstream (basic_syncbuf): Derive from
__syncbuf_base instead of basic_streambuf.
(basic_syncbuf::operator=): Remove self-assignment check.
(basic_syncbuf::swap): Remove self-swap check.
(basic_syncbuf::emit): Do not skip pubsync() call if sequence
is empty.
(basic_syncbuf::sync): Remove no-op pubsync on stringbuf.
(basic_syncbuf::overflow): Define override.
* testsuite/27_io/basic_syncstream/basic_ops/1.cc: Test
basic_osyncstream::put(char_type).
* testsuite/27_io/basic_ostream/emit/1.cc: New test.

Daily bump.

IBM Z: Fix bootstrap breakage due to HAVE_TF macro

Commit e627cda56865 ("IBM Z: Store long doubles in vector registers
when possible") introduced HAVE_TF macro which expands to a logical
"or" of HAVE_ constants.  Not all of these constants are available in
GENERATOR_FILE context, so a hack was used: simply expand to true in
this case, because the actual value matters only during compiler
runtime and not during generation.

However, one aspect of this value matters during generation after all:
whether or not it's a constant, which in this case it appears to be.
This results in incorrect values in insn-flags.h and broken bootstrap
for some configurations.

Fix by using a dummy value that is not a constant.

gcc/ChangeLog:

2020-11-10  Ilya Leoshkevich  <iii@linux.ibm.com>

* config/s390/s390.h (HAVE_TF): Use opaque value when
GENERATOR_FILE is defined.

libstdc++: Avoid bad_alloc exceptions when changing locales

For the --enable-clocale=generic configuration, the current code can
fail with a bad_alloc exception. This patch uses the nothrow version of
operator new and reports allocation failures by setting failbit in the
iostate variable.

* config/locale/generic/c_locale.cc (__set_C_locale()): New function
to set the "C" locale and return the name of the previous locale.
(__convert_to_v<float>, __convert_to_v<double>)
(__convert_to_v<long double>): Use __set_C_locale and set failbit on
error.

c++: Improve static_assert diagnostic [PR97518]

Currently, when a static_assert fails, we only say "static assertion failed".
It would be more useful if we could also print the expression that
evaluated to false; this is especially useful when the condition uses
template parameters.  Consider the motivating example, in which we have
this line:

  static_assert(is_same<X, Y>::value);

if this fails, the user has to play dirty games to get the compiler to
print the template arguments.  With this patch, we say:

  error: static assertion failed
  note: 'is_same<int*, int>::value' evaluates to false

which I think is much better.  However, always printing the condition that
evaluated to 'false' wouldn't be very useful: e.g. noexcept(fn) is
always parsed to true/false, so we would say "'false' evaluates to false"
which doesn't help.  So I wound up only printing the condition when it was
instantiation-dependent, that is, we called finish_static_assert from
tsubst_expr.

Moreover, this patch also improves the diagnostic when the condition
consists of a logical AND.  Say you have something like this:

  static_assert(fn1() && fn2() && fn3() && fn4() && fn5());

where fn4() evaluates to false and the other ones to true.  Highlighting
the whole thing is not that helpful because it won't say which clause
evaluated to false.  With the find_failing_clause tweak in this patch
we emit:

  error: static assertion failed
    6 | static_assert(fn1() && fn2() && fn3() && fn4() && fn5());
      |                                          ~~~^~

so you know right away what's going on.  Unfortunately, when you combine
both things, that is, have an instantiation-dependent expr and && in
a static_assert, we can't yet quite point to the clause that failed.  It
is because when we tsubstitute something like is_same<X, Y>::value, we
generate a VAR_DECL that doesn't have any location.  It would be awesome
if we could wrap it with a location wrapper, but I didn't see anything
obvious.

In passing, I've cleaned up some things:
* use iloc_sentinel when appropriate,
* it's nicer to call contextual_conv_bool instead of the rather verbose
  perform_implicit_conversion_flags,
* no need to check for INTEGER_CST before calling integer_zerop.

gcc/cp/ChangeLog:

PR c++/97518
* cp-tree.h (finish_static_assert): Adjust declaration.
* parser.c (cp_parser_static_assert): Pass false to
finish_static_assert.
* pt.c (tsubst_expr): Pass true to finish_static_assert.
* semantics.c (find_failing_clause_r): New function.
(find_failing_clause): New function.
(finish_static_assert): Add a bool parameter.  Use
iloc_sentinel.  Call contextual_conv_bool instead of
perform_implicit_conversion_flags.  Don't check for INTEGER_CST before
calling integer_zerop.  Call find_failing_clause and maybe use its
location.  Print the original condition or the failing clause if
SHOW_EXPR_P.

gcc/testsuite/ChangeLog:

PR c++/97518
* g++.dg/diagnostic/pr87386.C: Adjust expected output.
* g++.dg/diagnostic/static_assert1.C: New test.
* g++.dg/diagnostic/static_assert2.C: New test.

libcc1/ChangeLog:

PR c++/97518
* libcp1plugin.cc (plugin_add_static_assert): Pass false to
finish_static_assert.

c++: Add 5 unfixed tests.

A couple of dg-ice tests.

gcc/testsuite/ChangeLog:

PR c++/52830
PR c++/88982
PR c++/90799
PR c++/87765
PR c++/89565
* g++.dg/cpp0x/constexpr-52830.C: New test.
* g++.dg/cpp0x/vt-88982.C: New test.
* g++.dg/cpp1z/class-deduction76.C: New test.
* g++.dg/cpp1z/constexpr-lambda26.C: New test.
* g++.dg/cpp2a/nontype-class39.C: New test.

libstdc++: Reorder constructors in <sstream>

This groups all the constructors together, consistent with the synopses
in the C++20 standard.

libstdc++-v3/ChangeLog:

* include/std/sstream (basic_stringbug, basic_istringstream)
(basic_ostringstream, basic_stringstream): Reorder C++20
constructors to be declared next to other constructors.

libstdc++: Add remaining C++20 additions to <sstream> [P0408R7]

This adds the new overloads of basic_stringbuf::str, and the
corresponding overloads to basic_istringstream, basic_ostringstream and
basic_stringstream.

libstdc++-v3/ChangeLog:

* config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Tighten patterns.
(GLIBCXX_3.4.29): Export new symbols.
* include/bits/alloc_traits.h (__allocator_like): New concept.
* include/std/sstream (basic_stringbuf::swap): Add exception
specification.
(basic_stringbuf::str() const): Add ref-qualifier. Use new
_M_high_mark function.
(basic_stringbuf::str(const SAlloc&) const): Define new function.
(basic_stringbuf::str() &&): Likewise.
(basic_stringbuf::str(const basic_string<C,T,SAlloc>&)):
Likewise.
(basic_stringbuf::str(basic_string<C,T,Alloc>&&)): Likewise.
(basic_stringbuf::view() const): Use _M_high_mark.
(basic_istringstream::str, basic_ostringstream::str)
(basic_stringstream::str): Define new overloads.
* src/c++20/sstream-inst.cc (basic_stringbuf::str)
(basic_istringstream::str, basic_ostringstream::str)
(basic_stringstream::str): Explicit instantiation definitions
for new overloads.
* testsuite/27_io/basic_istringstream/view/char/1.cc: Add more
checks.
* testsuite/27_io/basic_istringstream/view/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/view/char/1.cc:
Likewise.
* testsuite/27_io/basic_stringstream/view/wchar_t/1.cc:
Likewise.
* testsuite/27_io/basic_istringstream/str/char/2.cc: New test.
* testsuite/27_io/basic_istringstream/str/wchar_t/2.cc: New test.
* testsuite/27_io/basic_ostringstream/str/char/3.cc: New test.
* testsuite/27_io/basic_ostringstream/str/wchar_t/3.cc: New test.
* testsuite/27_io/basic_stringbuf/str/char/4.cc: New test.
* testsuite/27_io/basic_stringbuf/str/wchar_t/4.cc: New test.
* testsuite/27_io/basic_stringstream/str/char/5.cc: New test.
* testsuite/27_io/basic_stringstream/str/wchar_t/5.cc.cc: New test.

libstdc++: Fix more unspecified comparisons to null pointer [PR 97415]

This adds some more null checks to avoid a relational comparison with a
null pointer, similar to 78198b6021a9695054dab039340202170b88423c.

libstdc++-v3/ChangeLog:

PR libstdc++/97415
* include/std/sstream (basic_stringbuf::_M_update_egptr)
(basic_stringbuf::__xfer_bufptrs::__xfer_bufptrs): Check for
null before comparing pointers.

Refactor copying decl section names

gcc/

* cgraph.h (symtab_node::get_section): Constify.
(symtab_node::set_section): Declare new overload.
* symtab.c (symtab_node::set_section): Define new overload.
(symtab_node::copy_visibility_from): Use new overload of
symtab_node::set_section.
(symtab_node::resolve_alias): Same.
* tree.h (set_decl_section_name): Declare new overload.
* tree.c (set_decl_section_name): Define new overload.
* tree-emutls.c (get_emutls_init_templ_addr): Same.
* cgraphclones.c (cgraph_node::create_virtual_clone): Use new
overload of symtab_node::set_section.
(cgraph_node::create_version_clone_with_body): Same.
* trans-mem.c (ipa_tm_create_version): Same.

gcc/c
* c-decl.c (merge_decls): Use new overload of
set_decl_section_name.

gcc/cp
* decl.c (duplicate_decls): Use new overload of
set_decl_section_name.
* method.c (use_thunk): Same.
* optimize.c (maybe_clone_body): Same.
* coroutines.cc (act_des_fn): Same.

gcc/d
* decl.cc (finish_thunk): Use new overload of
set_decl_section_name

Early exit from irange::set for poly ints.

My previous cleanups to irange::set moved the early exit when
VARYING.  This caused poly int varyings to be created with
incorrect min/max.

We can just set varying and exit for all poly ints.

gcc/ChangeLog:

* value-range.cc (irange::set): Early exit for poly ints.

analyzer: remove dead code

gcc/analyzer/ChangeLog:

* constraint-manager.cc (constraint_manager::merge): Remove
unused code.
* constraint-manager.h: Likewise.
* program-state.cc (sm_state_map::sm_state_map): Likewise.
(program_state::program_state): Likewise.
(test_sm_state_map): Likewise.
* program-state.h: Likewise.
* region-model-reachability.cc (reachable_regions::reachable_regions): Likewise.
* region-model-reachability.h: Likewise.
* region-model.cc (region_model::handle_unrecognized_call): Likewise.
(region_model::get_reachable_svalues): Likewise.
(region_model::can_merge_with_p): Likewise.

Fortran: OpenMP 5.0 (in_,task_)reduction clause extensions

gcc/fortran/ChangeLog:

* dump-parse-tree.c (show_omp_clauses): Handle new reduction enums.
* gfortran.h (OMP_LIST_REDUCTION_INSCAN, OMP_LIST_REDUCTION_TASK,
OMP_LIST_IN_REDUCTION, OMP_LIST_TASK_REDUCTION): Add enums.
* openmp.c (enum omp_mask1): Add OMP_CLAUSE_IN_REDUCTION
and OMP_CLAUSE_TASK_REDUCTION.
(gfc_match_omp_clause_reduction): Extend reduction handling;
moved from ...
(gfc_match_omp_clauses): ... here. Add calls to it.
(OMP_TASK_CLAUSES, OMP_TARGET_CLAUSES, OMP_TASKLOOP_CLAUSES):
Add OMP_CLAUSE_IN_REDUCTION.
(gfc_match_omp_taskgroup): Add task_reduction matching.
(resolve_omp_clauses): Update for new reduction clause changes;
remove removed nonmonotonic-schedule restrictions.
(gfc_resolve_omp_parallel_blocks): Add new enums to switch.
* trans-openmp.c (gfc_omp_clause_default_ctor,
gfc_trans_omp_reduction_list, gfc_trans_omp_clauses,
gfc_split_omp_clauses): Handle updated reduction clause.

gcc/ChangeLog:

* gimplify.c (gimplify_scan_omp_clauses, gimplify_omp_loop): Use 'do'
instead of 'for' in error messages for Fortran.
* omp-low.c (check_omp_nesting_restrictions): Likewise

gcc/testsuite/ChangeLog:

* gfortran.dg/gomp/schedule-modifiers-2.f90: Remove some dg-error.
* gfortran.dg/gomp/reduction4.f90: New test.
* gfortran.dg/gomp/reduction5.f90: New test.
* gfortran.dg/gomp/workshare-reduction-1.f90: New test.
* gfortran.dg/gomp/workshare-reduction-2.f90: New test.
* gfortran.dg/gomp/workshare-reduction-3.f90: New test.
* gfortran.dg/gomp/workshare-reduction-4.f90: New test.
* gfortran.dg/gomp/workshare-reduction-5.f90: New test.
* gfortran.dg/gomp/workshare-reduction-6.f90: New test.
* gfortran.dg/gomp/workshare-reduction-7.f90: New test.
* gfortran.dg/gomp/workshare-reduction-8.f90: New test.
* gfortran.dg/gomp/workshare-reduction-9.f90: New test.
* gfortran.dg/gomp/workshare-reduction-10.f90: New test.
* gfortran.dg/gomp/workshare-reduction-11.f90: New test.
* gfortran.dg/gomp/workshare-reduction-12.f90: New test.
* gfortran.dg/gomp/workshare-reduction-13.f90: New test.
* gfortran.dg/gomp/workshare-reduction-14.f90: New test.
* gfortran.dg/gomp/workshare-reduction-15.f90: New test.
* gfortran.dg/gomp/workshare-reduction-16.f90: New test.
* gfortran.dg/gomp/workshare-reduction-17.f90: New test.
* gfortran.dg/gomp/workshare-reduction-18.f90: New test.
* gfortran.dg/gomp/workshare-reduction-19.f90: New test.
* gfortran.dg/gomp/workshare-reduction-20.f90: New test.
* gfortran.dg/gomp/workshare-reduction-21.f90: New test.
* gfortran.dg/gomp/workshare-reduction-22.f90: New test.
* gfortran.dg/gomp/workshare-reduction-23.f90: New test.
* gfortran.dg/gomp/workshare-reduction-24.f90: New test.
* gfortran.dg/gomp/workshare-reduction-25.f90: New test.
* gfortran.dg/gomp/workshare-reduction-26.f90: New test.
* gfortran.dg/gomp/workshare-reduction-27.f90: New test.
* gfortran.dg/gomp/workshare-reduction-28.f90: New test.
* gfortran.dg/gomp/workshare-reduction-29.f90: New test.
* gfortran.dg/gomp/workshare-reduction-30.f90: New test.
* gfortran.dg/gomp/workshare-reduction-31.f90: New test.
* gfortran.dg/gomp/workshare-reduction-32.f90: New test.
* gfortran.dg/gomp/workshare-reduction-33.f90: New test.
* gfortran.dg/gomp/workshare-reduction-34.f90: New test.
* gfortran.dg/gomp/workshare-reduction-35.f90: New test.
* gfortran.dg/gomp/workshare-reduction-36.f90: New test.
* gfortran.dg/gomp/workshare-reduction-37.f90: New test.
* gfortran.dg/gomp/workshare-reduction-38.f90: New test.
* gfortran.dg/gomp/workshare-reduction-39.f90: New test.
* gfortran.dg/gomp/workshare-reduction-40.f90: New test.
* gfortran.dg/gomp/workshare-reduction-41.f90: New test.
* gfortran.dg/gomp/workshare-reduction-42.f90: New test.
* gfortran.dg/gomp/workshare-reduction-43.f90: New test.
* gfortran.dg/gomp/workshare-reduction-44.f90: New test.
* gfortran.dg/gomp/workshare-reduction-45.f90: New test.
* gfortran.dg/gomp/workshare-reduction-46.f90: New test.
* gfortran.dg/gomp/workshare-reduction-47.f90: New test.
* gfortran.dg/gomp/workshare-reduction-48.f90: New test.
* gfortran.dg/gomp/workshare-reduction-49.f90: New test.
* gfortran.dg/gomp/workshare-reduction-50.f90: New test.
* gfortran.dg/gomp/workshare-reduction-51.f90: New test.
* gfortran.dg/gomp/workshare-reduction-52.f90: New test.
* gfortran.dg/gomp/workshare-reduction-53.f90: New test.
* gfortran.dg/gomp/workshare-reduction-54.f90: New test.
* gfortran.dg/gomp/workshare-reduction-55.f90: New test.
* gfortran.dg/gomp/workshare-reduction-56.f90: New test.
* gfortran.dg/gomp/workshare-reduction-57.f90: New test.
* gfortran.dg/gomp/workshare-reduction-58.f90: New test.

opts: Change `is incompatible with` messages to have standard parametrised form

Hello,

In a recent review for one of the hwasan patches Richard S. noticed there are
quite a few errors of the form "%<someflag%> is incompatible with
<otherflag%>".
https://gcc.gnu.org/pipermail/gcc-patches/2020-October/556137.html

In order to avoid this creating extra work for translators we would like to
change these error messages to use the form "%qs is incompatible with %qs" and
pass the flag as format arguments.

This patch implements that change.
There is only one change in the output the compiler produces from this patch,
an error message of "-fsanitize=address and -fsanitize=kernel-address are
incompatible with -fsanitize=thread" has been changed to "-fsanitize=thread is
incompatible with -fsanitize=address|kernel-address".
This matches the similar error messages for live patching which use the
messages "-f<something> is incompatible with
-flive-patching=inline-only-static|inline-clone".

Ok for trunk?

gcc/ChangeLog:

* opts.c (control_options_for_live_patching): Reform 'is incompatible
with' error messages to use a standard message with differing format
arguments.
(finish_options): Likewise.

gcc/testsuite/ChangeLog:

* c-c++-common/ubsan/sanitize-recover-7.c: Update testcase.

Fix minor whitespace issues

libgcc/

* libgcc2.c: Fix whitespace issues in most recent change.

Improve generated code for various libgcc2.c routines

libgcc/

* libgcc2.c (__addvSI3): Use overflow builtins.
(__addvsi3, __addvDI3 ,__subvSI3, __subvsi3): Likewise.
(__subvDI3 __mulvSI3, __mulvsi3, __negvSI2): Likewise.
(__negvsi2, __negvDI2): Likewise.
(__cmpdi2, __ucmpdi2): Adjust implementation to improve
generated code.
* libgcc2.h (__ucmpdi2): Adjust prototype.

libgo: update to Go 1.15.4 release

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/268177

c, c++: Fix up -Wunused-value on COMPLEX_EXPRs [PR97748]

The -Wunused-value warning in both C and C++ FEs (implemented
significantly differently between the two) sees the COMPLEX_EXPRs created
e.g. for complex pre/post increment and many other expressions as useless
and warns about it.

For the C warning implementation, on e.g.
COMPLEX_EXPR < ++REALPART_EXPR <x>, IMAGPART_EXPR <x>>;
would warn even on the IMAGPART_EXPR <x> there alone etc., so what works
is check if we'd warn about both operands of COMPLEX_EXPR and if yes,
warn on the whole COMPLEX_EXPR, otherwise don't warn.

The C++ warning implementation is significantly different and for that one
the only warn if both would be warned about doesn't really work,
we then miss warnings e.g. about
COMPLEX_EXPR <REALPART_EXPR <SAVE_EXPR <x>> + 1.0e+0, IMAGPART_EXPR <SAVE_EXPR <x>>> >>>>>
The patch replaces the warning_at call with call to the c-family
warn_if_unused_value function.

On the testcase which after the initial new tests contains pretty much
everything from gcc.dg/Wunused-value-1.c both approaches seem to work
nicely.

2020-11-10  Jakub Jelinek  <jakub@redhat.com>

PR c/97748
gcc/c-family/
* c-common.h (warn_if_unused_value): Add quiet argument defaulted
to false.
* c-warn.c (warn_if_unused_value): Likewise.  Pass it down
recursively and just return true instead of warning if it is true.
Handle COMPLEX_EXPR.
gcc/cp/
* cvt.c (convert_to_void): Check (complain & tf_warning) in the outer
if rather than twice times in the inner one.  Use warn_if_unused_value.
Formatting fix.
gcc/testsuite/
* c-c++-common/Wunused-value-1.c: New test.