re PR go/92820 (libgo.so.15 has executable stack)

PR go/92820
    runtime: only build go-context for x86 GNU/Linux

    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/210258

From-SVN: r279063

re PR other/29842 ([meta-bug] outstanding patches / issues from STMicroelectronics)

PR go/29842
    runtime: update HURD support for mOS now being embedded

    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/210285

From-SVN: r279062

re PR rtl-optimization/92176 (LRA problem with reloads for subreg operands)

2019-12-06  Andreas Krebbel  <krebbel@linux.ibm.com>
    Vladimir Makarov  <vmakarov@redhat.com>

PR rtl-optimization/92176
* lra.c (simplify_subreg_regno): Don't permit unconditional
changing mode for LRA too.

2019-12-06  Andreas Krebbel  <krebbel@linux.ibm.com>
    Vladimir Makarov  <vmakarov@redhat.com>

PR rtl-optimization/92176
* gcc.target/s390/pr92176.c: New test.

Co-Authored-By: Vladimir Makarov <vmakarov@redhat.com>
From-SVN: r279061

Fix Fortran linker errors on AMD GCN

2019-12-06  Kwok Cheung Yeung  <kcy@codesourcery.com>

libgomp/
* config/accel/proc.c (omp_get_num_procs): Apply ialias macro.

From-SVN: r279060

Avoid -Wincompatible-pointer-types on targets like arm-eabi.

gcc/testsuite/ChangeLog:

* gcc.dg/Wstringop-overflow-23.c: Use the correct argument type.
* gcc.dg/Wstringop-overflow-24.c: Same.

From-SVN: r279059

[C++] Pass type uses through the verify_type_context hook

This patch makes the C++ frontend work with the verify_type_context hook.
We need some new type contexts for features that don't exist in C, but
otherwise the patch is very similar to the C one.

TCTX_CAPTURE_BY_COPY could really be treated as an instance of
TCTX_FIELD, but the error message is better if we split it out.

2019-12-06  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* target.h (TCTX_ALLOCATION, TCTX_DEALLOCATION, TCTX_EXCEPTIONS)
(TCTX_CAPTURE_BY_COPY): New type_context_kinds.
* config/aarch64/aarch64-sve-builtins.cc (verify_type_context):
Handle them.

gcc/cp/
* decl.c (start_decl_1): Use verify_type_context to check whether
the target allows variables of a particular type to have static
or thread-local storage duration.
(check_array_initializer): Use verify_type_context to check whether
the target allows a particular type to be used as an array element.
(create_array_type_for_decl): Likewise.
(cp_finish_decl): Use verify_type_context to check whether
the target allows static member variables of a particular type.
(grokdeclarator): Likewise.  Also use verify_type_context to check
whether the target allows non-static member variables of a particular
type.
* except.c: Include target.h.
(is_admissible_throw_operand_or_catch_parameter): Use
verify_type_context to check whether the target allows particular
types to be thrown and caught.
* typeck2.c (add_exception_specifier): Likewise.
* init.c (build_new_1): Use verify_type_context to check whether
the target allows particular types to be dynamically allocated.
(build_vec_delete_1, build_delete): Use verify_type_context to check
whether the target allows particular types to be deleted.
* lambda.c (add_capture): Use verify_type_context to check
whether the target allows particular types to be captured by copy.
* pt.c: Include target.h.
(instantiate_class_template_1): Use verify_type_context to check
whether the target allows non-static member variables of a particular
type.
* typeck.c (cxx_alignof_expr): Use verify_type_context to check
whether the target allows the alignment of a particular type
to be measured.
(pointer_diff, cp_build_unary_op): Use verify_type_context to check
whether the target allows arithmetic involving pointers to particular
types.

gcc/testsuite/
* g++.dg/ext/sve-sizeless-1.C: New test.
* g++.dg/ext/sve-sizeless-2.C: Likewise.

From-SVN: r279058

Fix unrecognised GCN instruction.

2019-12-06  Andrew Stubbs  <ams@codesourcery.com>

gcc/
* config/gcn/gcn-valu.md (gather<mode>_insn_1offset<exec>): Use %o
in the asm output.

From-SVN: r279055

Enable QI/HImode vector moves

2019-12-06  Andrew Stubbs  <ams@codesourcery.com>

gcc/
* config/gcn/gcn-valu.md (VEC_1REG_MODE): Remove V64QI and V64HI.
(VEC_1REG_ALT): Likewise.
(VEC_ALL1REG_MODE): New mode iterator.
(VEC_1REG_INT_MODE): Remove V64QI and V64HI.
(VEC_1REG_INT_ALT): Likewise.
(VEC_ALL1REG_INT_MODE): New mode interator.
(VEC_ALL1REG_INT_ALT): Likewise.
(VEC_REG_MODE): Remove V64QI and V64HI.
(VEC_ALLREG_MODE): New mode interator.
(vec_merge): Change to VEC_ALLREG_MODE.
(vec_merge_with_clobber): Likewise.
(vec_merge_with_vcc): Likewise.
(mov<mode>): Likewise.
(mov<mode>_unspec): Likewise.
(*mov<mode>): Change to VEC_ALL1REG_MODE.
(mov<mode>_exec): Likewise.
(*mov<mode>_exec_match): Likewise.
(mov<mode>_sgprbase): Likewise.
(reload_in<mode>): Change to VEC_ALLREG_MODE.
(reload_out<mode>): Likewise.
(scalar address splits): Likewise.
(*vec_set<mode>): Change to VEC_ALL1REG_MODE.
(vec_set<mode>): Change to VEC_ALLREG_MODE.
(*vec_set<mode>_1): Change to VEC_ALL1REG_MODE.
(vec_duplicate<mode><exec>): Likewise.
(vec_extract<mode><scalar_mode>): Likewise.
(vec_init<mode><scalar_mode>): Change to VEC_ALLREG_MODE.
(gather_load<mode>): Likewise.
(gather<mode>_exec): Likewise.
(gather<mode>_expr<exec>): Likewise.
(gather<mode>_insn_1offset<exec>): Likewise.
(gather<mode>_insn_1offset_ds<exec>): Likewise.
(gather<mode>_insn_2offsets<exec>): Likewise.
(ds_bpermute<mode>): Change to VEC_ALL1REG_MODE.
(VEC_INT_MODE): Remove V64QI and V64HI.
(vcond_mask_<mode>di): Change to VEC_ALLREG_MODE.
(vcond<VEC_1REG_MODE:mode><VEC_1REG_ALT:mode>): Change to
VEC_ALL1REG_MODE.
(vcond<VEC_1REG_MODE:mode><VEC_1REG_ALT:mode>_exec): Likewise.
(vcondu<VEC_1REG_MODE:mode><VEC_1REG_INT_ALT:mode>): Likewise.
(vcondu<VEC_1REG_MODE:mode><VEC_1REG_INT_ALT:mode>_exec): Likewise.
(maskload<mode>di): Change to VEC_ALL1REG_MODE.
(maskstore<mode>di): Likewise.
(mask_gather_load<mode>): Likewise.
(mov_from_lane63_<mode>): Likewise.
* config/gcn/gcn.c (gcn_vector_mode_supported_p): Renable V64QImode
and V64HImode vectorization.
(gcn_related_vector_mode): New function.
(TARGET_VECTORIZE_RELATED_MODE): New define.

From-SVN: r279053

re PR fortran/92775 (Incorrect expression in DW_AT_byte_stride on an array)

PR fortran/92775
* trans.h (struct lang_type, struct lang_decl): Remove span member.
(GFC_DECL_SPAN, GFC_TYPE_ARRAY_SPAN): Remove macros.
* trans-array.h (gfc_get_descriptor_offsets_for_info): Add another
argument.
* trans-array.c (gfc_get_descriptor_offsets_for_info): Add SPAN_OFF
argument and initialize *SPAN_OFF to the offset of span field.
* trans-types.c (gfc_get_array_descr_info): Adjust
gfc_get_descriptor_offsets_for_info caller.  Compute elem_size
as base->span instead of TYPE_SIZE_UNIT (etype) constant.

From-SVN: r279045

[OpenMP/OpenACC/Fortran] Fix mapping of optional (present|absent) arguments

2019-12-06  Tobias Burnus  <tobias@codesourcery.com>
            Kwok Cheung Yeung <kcy@codesourcery.com>

        gcc/fortran/
        * trans-openmp.c (gfc_build_conditional_assign,
        gfc_build_conditional_assign_expr): New static functions.
        (gfc_omp_finish_clause, gfc_trans_omp_clauses): Handle mapping of
        absent optional arguments and fix mapping of present optional args.

        gcc/
        * omp-low.c (lower_omp_target): For optional arguments, deref once
        more to obtain the type.

        libgomp/
        * oacc-mem.c (update_dev_host, gomp_acc_insert_pointer): Just return
        if input it a NULL pointer.
        * testsuite/libgomp.oacc-c-c++-common/lib-43.c: Remove; dependent on
        diagnostic of NULL pointer.
        * testsuite/libgomp.oacc-c-c++-common/lib-47.c: Ditto.
        * testsuite/libgomp.fortran/optional-map.f90: New.
        * testsuite/libgomp.fortran/use_device_addr-1.f90
        (test_dummy_opt_callee_1_absent): New.
        (test_dummy_opt_call_1): Call it.
        * testsuite/libgomp.fortran/use_device_addr-2.f90: Likewise.
        * testsuite/libgomp.fortran/use_device_addr-3.f90: Likewise.
        * testsuite/libgomp.fortran/use_device_addr-4.f90: Likewise.
        * testsuite/libgomp.oacc-fortran/optional-cache.f95: New.
        * testsuite/libgomp.oacc-fortran/optional-data-copyin-by-value.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-data-copyin.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-data-copyout.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-data-enter-exit.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-declare.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-firstprivate.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-host_data.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-nested-calls.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-private.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-reduction.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-update-device.f90: New.
        * testsuite/libgomp.oacc-fortran/optional-update-host.f90: New.

Co-Authored-By: Kwok Cheung Yeung <kcy@codesourcery.com>
From-SVN: r279043

match.pd (nop_convert): Remove empty match.

2019-12-06  Richard Biener  <rguenther@suse.de>

* match.pd (nop_convert): Remove empty match.  Use nop_convert?
everywhere.

From-SVN: r279040

[testsuite][aarch64] type_redef_11.c: Update expected diagnostics.

After the fix for PR c/36941 and PR c/88827 (r278976), this test emits
a different error message and needs an update.

2019-12-06  Christophe Lyon  <christophe.lyon@linaro.org>

PR c/36941
PR c/88827
* gcc.target/aarch64/sve/acle/general-c/type_redef_11.c: Update
expected diagnostics.

From-SVN: r279039

Avoid quadratic behaviour in prune_runtime_alias_test_list

prune_runtime_alias_test_list used ordered_remove to remove a merged
alias pair, which made the function quadratic when many aliases could
be removed.

I had a testcase in which these memmoves accounted for an impressive
85% of compile time.  The fact that we had so many probably shows
a deeper problem, but still, it's easy to remove as we go.

2019-12-06  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-data-ref.c (prune_runtime_alias_test_list): Exit early
for empty vectors.  Avoid using ordered_remove and instead
shuffle the vector as we go.

From-SVN: r279038

genmatch.c (enum tree_code): Remove CONVERT{0,1,2} and VIEW_CONVERT{0,1,2}.

2019-12-06  Richard Biener  <rguenther@suse.de>

* genmatch.c (enum tree_code): Remove CONVERT{0,1,2} and
VIEW_CONVERT{0,1,2}.
(expr::opt_grp): Add and initialize.
(lower_opt_convert): Rename to ...
(lower_opt): ... and work on opt_grp, simply switching operations
from being optional to being present or not.
(has_opt_convert): Rename to ...
(has_opt): ... and adjust.
(parser::parse_operation): Return the optional opt_grp,
remove special-casing of conditional operations and more generally
parse [digit]'?'.
(parser::parse_expr): Stick on the parsed opt_grp and perform
rough verification.
(parser::parse_for): Remove now unnecessary code.
(main): Likewise.
* doc/match-and-simplify.texi: Mention ? now works on all
unary operations and also match predicates.

From-SVN: r279037

cgraphclones.c (cgraph_node::create_clone): Only localize toplevel functions, not inline clones.

* cgraphclones.c (cgraph_node::create_clone): Only localize toplevel
functions, not inline clones.

From-SVN: r279036

* cfgexpand.c (expand_debug_expr): Do not ICE on SAD_EXPR.

From-SVN: r279035

genmatch.c (c_expr::gen_transform): Emit newlines from line number changes rather than after every semicolon.

2019-12-06  Richard Biener  <rguenther@suse.de>

* genmatch.c (c_expr::gen_transform): Emit newlines from line
number changes rather than after every semicolon.

From-SVN: r279034

re PR tree-optimization/92819 (Worse code generated on avx2 due to simplify_vector_constructor)

2019-12-06  Richard Biener  <rguenther@suse.de>

PR tree-optimization/92819
* match.pd (VEC_PERM_EXPR -> BIT_INSERT_EXPR): Handle inserts
into the last lane.  For two-element vectors try inserting
into the last lane when inserting into the first fails.

* gcc.target/i386/pr92819-1.c: New testcase.
* gcc.target/i386/pr92803.c: Adjust.

From-SVN: r279033

re PR go/92810 (Compiling GCC go for aarch64_be-marvell-linux-gnu fails)

PR go/92810
    libgo: recognize aarch64_be as arm64be

    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/210038

From-SVN: r279032

PR testsuite/92829 - several test case failures starting with r278983

gcc/testsuite/ChangeLog:

* gcc.dg/Warray-bounds-56.c: Rearrange code to avoid powerpc64*
failures.

From-SVN: r279031

common.opt (fprofile-partial-training): Terminate description with full stop.

* common.opt (fprofile-partial-training): Terminate description with
full stop.

From-SVN: r279030

PR middle-end/92622 - FAIL: gcc.dg/Warray-bounds-22.c on ILP32: missing warnings for VLA on lines 67 and 69

gcc/ChangeLog:

PR middle-end/92622
* tree-vrp.c (vrp_prop::check_array_ref): Avoid using a variable
left uninitialized by get_addr_base_and_unit_offset ofn failure.

From-SVN: r279029

Daily bump.

From-SVN: r279028

Do not clear m_vr and bits in ipa_set_jf_unknown.

* ipa-prop.c (ipa_set_jf_unknown): Do not clear bits and m_vr.
(detect_type_change_from_memory_writes): Remoe parameter JFUNC.
(detect_type_change): Likewise.
(detect_type_change_ssa): Likewise.
(ipa_analyze_virtual_call_uses): Update.

From-SVN: r279025

re PR tree-optimization/92768 (Maybe a wrong code for vector constants)

PR tree-optimization/92768
* gcc.dg/pr92768.c: Add -w -Wno-psabi to dg-options.

From-SVN: r279024

Disable --eh-frame-hdr with -pie or -shared on nios2-linux-gnu.

2019-12-05  Sandra Loosemore  <sandra@codesourcery.com>

Disable --eh-frame-hdr with -pie or -shared on nios2-linux-gnu.

The nios2 ABI doesn't have appropriate relocations to support
--eh-frame-hdr with -pie or -shared, so we need to override the
default specs that add that link option.  Otherwise we get linker
warnings about invalid FDE encodings.

gcc/
* config/nios2/linux.h (LINK_EH_SPEC): Define.

gcc/testsuite/
* g++.target/nios2/hello-pie.C: New.
* g++.target/nios2/nios2.exp: New.

From-SVN: r279023

Fix g++.dg/torture/pr59226.C

this patch fixes ICE in g++.dg/torture/pr59226.C which was triggered by
new comdat_local sanity check.  What happens here is that function gets
inlined into its own thunk which makes it !comdat_local_p but the updating
code does not notice since thunk calls comdat local alias of the function
itself and we look at alias target rather than original callee.

This also shows that we miss optimization here.  Currently we will not inline
thunk out of its comdat local group w/o inlining function it is associated with
into it.

We should teach inline_call to reoslve edges to aliases while inlining and
relax calls_comdat_local flag.  But this needs bit more work, so I fix the
ICE first.

* ipa-inline-transform.c (inline_call): Fix maintenatnce of comdat_local

From-SVN: r279021

PR c++/91353 - P1331R2: Allow trivial default init in constexpr contexts.

This patch implements C++20 P1331, allowing trivial default initialization in
constexpr contexts.

* c-cppbuiltin.c (c_cpp_builtins): Adjust the value of __cpp_constexpr.

* class.c (trivial_default_constructor_is_constexpr): Return true in
C++20.
* constexpr.c (cx_check_missing_mem_inits): Allow missing field
initializers in C++20.
(cxx_eval_call_expression): Don't clear CONSTRUCTOR_NO_CLEARING for
constexpr constructors in C++20.
(reduced_constant_expression_p): Don't set FIELD for union and array
types.  Skip empty class fields without initializers.
* decl.c (check_for_uninitialized_const_var): Permit trivial default
initialization in constexpr.
(next_initializable_field): Don't skip vptr fields.
* method.c (walk_field_subobs): Still consider a constructor that
doesn't initialize all the members constexpr.

* g++.dg/cpp0x/constexpr-array6.C: Adjust dg-error.
* g++.dg/cpp0x/constexpr-ctor.C: Likewise.
* g++.dg/cpp0x/constexpr-diag3.C: Likewise.
* g++.dg/cpp0x/constexpr-diag4.C: Likewise.
* g++.dg/cpp0x/constexpr-ex3.C: Likewise.
* g++.dg/cpp0x/constexpr-template2.C: Likewise.
* g++.dg/cpp0x/constexpr-union2.C: Likewise.
* g++.dg/cpp0x/lambda/lambda-mangle.C: Rip out a piece of code ...
* g++.dg/cpp0x/lambda/lambda-mangle6.C: ... and put it here.
* g++.dg/cpp0x/pr79118.C: Adjust dg-error.
* g++.dg/cpp1y/constexpr-83921-3.C: Likewise.
* g++.dg/cpp1y/constexpr-neg1.C: Likewise.
* g++.dg/cpp1z/constexpr-lambda12.C: Likewise.
* g++.dg/cpp1z/feat-cxx1z.C: Use -std=c++17.
* g++.dg/cpp2a/constexpr-init1.C: New test.
* g++.dg/cpp2a/constexpr-init2.C: New test.
* g++.dg/cpp2a/constexpr-init3.C: New test.
* g++.dg/cpp2a/constexpr-init4.C: New test.
* g++.dg/cpp2a/constexpr-init5.C: New test.
* g++.dg/cpp2a/constexpr-init6.C: New test.
* g++.dg/cpp2a/constexpr-init7.C: New test.
* g++.dg/cpp2a/constexpr-init8.C: New test.
* g++.dg/cpp2a/constexpr-init9.C: New test.
* g++.dg/cpp2a/constexpr-init10.C: New test.
* g++.dg/cpp2a/constexpr-init11.C: New test.
* g++.dg/cpp2a/constexpr-init12.C: New test.
* g++.dg/cpp2a/constexpr-init13.C: New test.
* g++.dg/cpp2a/constexpr-init14.C: New test.
* g++.dg/cpp2a/constexpr-init15.C: New test.
* g++.dg/cpp2a/constexpr-try5.C: Adjust dg-error.
* g++.dg/cpp2a/feat-cxx2a.C: Test __cpp_constexpr.
* g++.dg/cpp2a/lambda-mangle.C: New test.
* g++.dg/debug/dwarf2/pr44641.C: Skip for c++2a.
* g++.dg/ext/stmtexpr21.C: Adjust dg-error.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
From-SVN: r279019

PR c++/92271 - make __is_same alias for __is_same_as.

Richard Smith proposed adding a synonym for __is_same_as, to accomodate the
convention of exposing std::SOME_TRAIT<A, B>::value as __SOME_TRAIT(A, B).

So add that alias, and also adjust the C++ printer.  I didn't bother changing
the RID_ identifier.

* c-common.c: Add __is_same, an alias for __is_same_as.

* cxx-pretty-print.c (pp_cxx_trait_expression) <case CPTK_IS_SAME_AS>:
Print "__is_same".

* g++.dg/ext/is_same.C: New test.

From-SVN: r279018

cgraphclones.c (localize_profile): New function.

* cgraphclones.c (localize_profile): New function.
(cgraph_node::create_clone): Use it for partial profiles.
* common.opt (fprofile-partial-training): New flag.
* doc/invoke.texi (-fprofile-partial-training): Document.
* ipa-cp.c (update_profiling_info): For partial profiles do not
set function profile to zero.
* profile.c (compute_branch_probabilities): With partial profile
watch if edge count is zero and turn all probabilities to guessed.
(compute_branch_probabilities): For partial profiles do not apply
profile when entry count is zero.
* tree-profile.c (tree_profiling): Only do value_profile_transformations
when profile is read.

From-SVN: r279013

[Patch, GCC] Fix a condition post r278611

gcc/ChangeLog

2019-12-05  Sudakshina Das  <sudi.das@arm.com>

* tree-vect-loop.c (vect_model_reduction_cost): Remove reduction_type
check from if condition.

From-SVN: r279012

re PR go/92820 (libgo.so.15 has executable stack)

PR go/92820
    runtime: always mark assembly file as non-executable stack

    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/210037

From-SVN: r279010

OpenMP] Fix use_device_… with absent optional arg

        gcc/fortran/
        * trans-openmp.c (gfc_omp_is_optional_argument,
        gfc_omp_check_optional_argument): Handle type(c_ptr),value which uses a
        hidden argument for the is-present check.

        gcc/
        * omp-low.c (lower_omp_target): For use_device_ptr/use_derice_addr
        and Fortran's optional arguments, unconditionally add the is-present
        condition before the libgomp call.

        libgomp/
        * testsuite/libgomp.fortran/use_device_ptr-optional-2.f90: Add
        'type(c_ptr), value' test case. Conditionally map the per-value
        passed arguments.

From-SVN: r279004

* cp-gimplify.c: Include memmodel.h.

From-SVN: r279003

Check for bitwise identity when encoding VECTOR_CSTs (PR 92768)

This PR shows that we weren't checking for bitwise-identical values
when trying to encode a VECTOR_CST, so -0.0 was treated the same as
0.0 for -fno-signed-zeros.  The patch adds a new OEP flag to select
that behaviour.

2019-12-05  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
PR middle-end/92768
* tree-core.h (OEP_BITWISE): New flag.
* fold-const.c (operand_compare::operand_equal_p): Handle it.
* tree-vector-builder.h (tree_vector_builder::equal_p): Pass it.

gcc/testsuite/
PR middle-end/92768
* gcc.dg/pr92768.c: New test.

From-SVN: r279002

libstdc++: Fix bug in std::span test

The previous commit fixed the std::span constructors from const arrays,
revealing a bug in this test.

* testsuite/23_containers/span/lwg3255.cc: Fix test. Constructing a
span of non-const elements should not be possible from a const array
or an array of const elements.

From-SVN: r279001

libstdc++: Implement P1872R0 and P1394R0 for std::span

This also fixes a bug in the implementation of LWG 3255, which causes:
FAIL: 23_containers/span/lwg3255.cc (test for excess errors)
That's because the test was wrong and verified the buggy behaviour. That
will be fixed in the following commit.

2019-12-05  JeanHeyd "ThePhD" Meneide  <phdofthehouse@gmail.com>

Implement P1872R0 and P1394R0 for std::span
* include/bits/range_access.h (__adl_begin, __adl_end): Remove.
(sentinel_t, range_value_t, range_reference_t)
(range_rvalue_reference_t, __forwarding_range, disable_sized_range)
(output_range, input_range, forward_range, bidirectional_range)
(random_access_range, contiguous_range, common_range): Move here from
<ranges>, to make this the "ranges lite" internal header.
* include/std/ranges: Move basic aliases and concepts to
<bits/range_access.h>.
* include/std/span: Use concepts and ranges:: calls instead of
enable_if and friends.
* include/std/type_traits: Add __is_array_convertible trait.

From-SVN: r279000

re PR tree-optimization/92818 (Typo in vec_perm -> bit_insert pattern)

2019-12-05  Richard Biener  <rguenther@suse.de>

PR middle-end/92818
* tree-ssa-forwprop.c (simplify_vector_constructor): Improve
heuristics on what don't care element to choose.
* match.pd (VEC_PERM_EXPR -> BIT_INSERT_EXPR): Fix typo.

* gcc.target/i386/pr92818.c: New testcase.

From-SVN: r278998

libstdc++: Define std::lexicographical_compare_three_way for C++20

* include/bits/stl_algobase.h (lexicographical_compare_three_way):
Define for C++20.
* testsuite/25_algorithms/lexicographical_compare_three_way/1.cc: New
test.
* testsuite/25_algorithms/lexicographical_compare_three_way/
constexpr.cc: New test.

From-SVN: r278996

Fix __gcov_exit fn prototype.

2019-12-05  Martin Liska  <mliska@suse.cz>

PR gcov-profile/92817
* coverage.c (build_gcov_exit_decl): Remove superfluous
void_type_node.

From-SVN: r278995

MSP430: Fix postinc addressing mode being used for dst op of CMP insns

2019-12-05  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

* config/msp430/msp430.md (cbranch<mode>4): Use
msp430_general_dst_nonv_operand instead of nonimmediate_operand for
dest operand of CMP instruction.
(cbranchpsi4_real): Likewise.
(cbranchqi4_real): Likewise.
(cbranchhi4_real): Likewise.
(cbranchpsi4_reversed): Likewise.
(cbranchqi4_reversed): Likewise.
(cbranchhi4_reversed): Likewise.

From-SVN: r278994

Skip test gcc/testsuite/gcc.dg/asm-4.c for amdgcn target

2019-12-05  Frederik Harwath  <frederik@codesourcery.com>

gcc/testsuite/
* gcc.dg/asm-4.c: Skip on target amdgcn-*-*.

From-SVN: r278993

re PR target/92055 ([avr] Support 64-bit double)

PR target/92055
* config/avr/t-avrlibc (MULTISUBDIR): Search for double, not double64.

From-SVN: r278992

re PR tree-optimization/92803 (error: type mismatch in 'vec_perm_expr' since r278764)

2019-12-05  Richard Biener  <rguenther@suse.de>

PR tree-optimization/92803
* tree-ssa-forwprop.c (simplify_vector_constructor): Fix
invariant vector construction.

* gcc.target/i386/pr92803.c: New testcase.

From-SVN: r278991

Fix profile name files without -fprofile-dir.

2019-12-05  Martin Liska  <mliska@suse.cz>

PR gcov-profile/91971
* coverage.c (coverage_init): Mangle full path
only when -fprofile-dir is used.

From-SVN: r278990

re PR target/92791 (ICE in extract_insn, at recog.c:2311 since r278645)

PR target/92791
* config/i386/i386.md (movstrict<mode>): Move test for
TARGET_PARTIAL_REG_STALL and not optimizing for size from
expander's condition to the body - FAIL; in that case.

From-SVN: r278989

re PR fortran/92781 (ICE in convert_nonlocal_reference_op, at tree-nested.c:1065)

PR fortran/92781
* trans-decl.c (gfc_get_symbol_decl): If sym->backend_decl is
current_function_decl, add length to current rather than parent
function and expect DECL_CONTEXT (length) to be current_function_decl.

* gfortran.dg/pr92781.f90: New test.

From-SVN: r278988

typeck2.c (build_functional_cast): Add location_t parameter and use it.

/gcc/cp
2019-12-05  Paolo Carlini  <paolo.carlini@oracle.com>

* typeck2.c (build_functional_cast): Add location_t parameter
and use it.
* cp-tree.h: Update declaration.
* parser.c (cp_parser_functional_cast): Adjust call.
* call.c (build_op_delete_call): Likewise.
(build_new_method_call_1): Likewise.
* decl.c (check_initializer): Likewise.
* pt.c (tsubst_copy_and_build): Likewise.
* semantics.c (finish_compound_literal): Likewise.

/libcc1
2019-12-05  Paolo Carlini  <paolo.carlini@oracle.com>

* libcp1plugin.cc (plugin_build_expression_list_expr): Adjust
build_functional_cast call.

/testsuite
2019-12-05  Paolo Carlini  <paolo.carlini@oracle.com>

* g++.dg/diagnostic/functional-cast-to-array-type-1.C: New.
* g++.dg/cpp0x/auto25.C: Check location(s) too.
* g++.dg/cpp0x/auto28.C: Likewise.
* g++.dg/init/reference2.C: Likewise.
* g++.dg/parse/template2.C: Likewise.
* g++.dg/template/error8.C: Likewise.
* g++.old-deja/g++.ns/crash3.C: Likewise.
* g++.old-deja/g++.ns/template7.C: Likewise.
* g++.old-deja/g++.pt/crash8.C: Likewise.

From-SVN: r278987

testsuite/libgomp.oacc-fortran:  Update dg-output to fix GCN

        * testsuite/libgomp.oacc-fortran/error_stop-1.f: Also don't
        expect dg-output of 'Error termination.' for GCN.
        * testsuite/libgomp.oacc-fortran/error_stop-2.f: Likewise.
        * testsuite/libgomp.oacc-fortran/error_stop-3.f: Likewise.

Plus: Fix date of a previous commit in:
        * gcc/fortran/ChangeLog
        * gcc/testsuite/ChangeLog

From-SVN: r278986

* edtest.c (test1): Add noclone attribute.

From-SVN: r278985

libbacktrace: simplify DWARF section handling

This is in preparation for adding DWARF 5 support.

* internal.h (enum dwarf_section): Define.
(struct dwarf_sections): Define.
(backtrace_dwarf_add): Update declaration to replace specific
section parameters with dwarf_sections parameter.
* dwarf.c (struct dwarf_data): Replace specific section fields
with dwarf_sections field.
(read_attribute): Use dwarf_sections with altlink.
(build_address_map): Replace specific section parameters with
dwarf_sections parameter.  Change all callers.
(read_line_info): Use dwarf_sections with ddata.
(read_referenced_name): Likewise.
(add_function_ranges): Likewise.
(read_function_entry): Likewise.
(read_function_info): Likewise.
(build_dwarf_data): Replace specific section parameters with
dwarf_sections parameter.  Change all callers.
(backtrace_dwarf_add): Likewise.
* elf.c (enum debug_section): Remove.
(dwarf_section_names): Remove .zdebug names.
(elf_add): Track zsections separately.  Build dwarf_sections.
* pecoff.c (enum debug_section): Remove.
(struct debug_section_info): Remove data field.
(coff_add): Build dwarf_sections.
* xcoff.c (enum dwarf_section): Remove.  Replace DWSECT_xxx
references with DEBUG_xxx references.
(xcoff_add): Build dwarf_sections.

From-SVN: r278984

PR middle-end/91582 - missing heap overflow detection for strcpy

gcc/ChangeLog:

PR middle-end/91582
* builtins.c (gimple_call_alloc_size): New function.
(compute_objsize): Add argument.  Call gimple_call_alloc_size.
Handle variable offsets and indices.
* builtins.h (gimple_call_alloc_size): Declare.
(compute_objsize): Add argument.
* gcc/gimple-ssa-warn-restrict.c: Remove assertions.
* tree-ssa-strlen.c (handle_store): Handle calls to allocated objects.

gcc/testsuite/ChangeLog:

PR middle-end/91582
* c-c++-common/Wstringop-truncation.c: Remove xfails.
* g++.dg/warn/Wstringop-overflow-4.C: New test.
* g++.dg/ext/attr-alloc_size.C: Suppress -Warray-bounds.
* gcc.dg/Warray-bounds-56.c: New test.
* gcc.dg/Wstringop-overflow-22.c: New test.
* gcc.dg/attr-alloc_size.c: Suppress -Warray-bounds.
* gcc.dg/attr-copy-2.c: Same.
* gcc.dg/builtin-stringop-chk-5.c: Remove xfails.
* gcc.dg/builtin-stringop-chk-8.c: Same.  Correct the text of expected
warnings.
* gcc.target/i386/pr82002-2a.c: Prune expected warning.
* gcc.target/i386/pr82002-2b.c: Same.

From-SVN: r278983

libstdc++: Define pretty printer for comparison categories

* python/libstdcxx/v6/printers.py (StdCmpCatPrinter): New printer.
* testsuite/libstdc++-prettyprinters/cxx20.cc: New test.

From-SVN: r278982

libstdc++: Implement spaceship for std::array (P1614R2)

As done for std::pair, this defines operator<=> as a non-member function
template and does not alter operator==, as expected to be proposed as
the resolution to an unpublished LWG issue.

Instead of calling std::lexicographical_compare_three_way the <=>
overload is implemented by hand to take advantage of the fact the
element types and array sizes are known to be the same.

* include/bits/cpp_type_traits.h (__is_byte<char8_t>): Add
specialization.
* include/std/array (operator<=>): Likewise.
* testsuite/23_containers/array/comparison_operators/constexpr.cc:
Test three-way comparisons and arrays of unsigned char.
* testsuite/23_containers/array/tuple_interface/get_neg.cc: Adjust
dg-error line numbers.

From-SVN: r278981

Daily bump.

From-SVN: r278980

Fix C handling of use of lvalues of incomplete types (PR c/36941, PR c/88827).

Bug 88827 points out that GCC should not be rejecting C code that
dereferences a pointer to an incomplete type in the case that uses &*
to take the address of the resulting lvalue, because no constraint is
violated in that case (other than for C90 when the incomplete type is
unqualified void, which we already handle correctly) and as the lvalue
never gets converted to an rvalue there is no undefined behavior
either.

This means that the diagnostic for such a dereference is bogus and
should be removed; if the lvalue gets converted to an rvalue, there
should be an appropriate error later for the use of the incomplete
type.  In most cases, there is, but bug 36941 points out the lack of a
diagnostic when the incomplete (non-void) type gets cast to void
(where a diagnostic seems appropriate for this undefined behavior as a
matter of quality of implementation).

This patch removes the bogus diagnostic (and C_TYPE_ERROR_REPORTED
which was only used in the code that is removed - only that one, bogus
diagnostic had this duplicate suppression, not any of the other, more
legitimate diagnostics for use of incomplete types) and makes
convert_lvalue_to_rvalue call require_complete_type for arguments not
of void types, so that all relevant code paths (possibly except some
for ObjC) get incomplete types diagnosed.  It's possible that this
makes some other checks for incomplete types obsolete, but no attempt
is made to remove any such checks.

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

PR c/36941
PR c/88827
gcc/c:
* c-typeck.c (convert_lvalue_to_rvalue): Call
require_complete_type for arguments not of void types.
(build_indirect_ref): Do not diagnose dereferencing pointers to
incomplete types.
* c-tree.h (C_TYPE_ERROR_REPORTED): Remove.

gcc/testsuite:
* gcc.dg/lvalue-9.c, gcc.dg/lvalue-10.c: New tests.
* gcc.dg/array-8.c, gcc.dg/enum-incomplete-1.c,
gcc.dg/enum-incomplete-3.c, gcc.dg/noncompile/incomplete-3.c,
gcc.dg/pr48552-1.c, gcc.dg/pr48552-2.c, gcc.dg/pr63543.c,
gcc.dg/pr69796.c: Update expected diagnostics.

From-SVN: r278976

* cp-gimplify.c: Include tm_p.h.

From-SVN: r278975

Use fixed registers for queue ptr sgpr pair

gcc/
* config/gcn/gcn.h (FIXED_REGISTERS): Make s6/s7 fixed registers.

From-SVN: r278974

Do not define builtins that overload disabled builtins.

PR bootstrap/92661
* config/rs6000/rs6000-c.c (struct altivec_builtin_types): Move to
rs6000.h.
(altivec_overloaded_builtins): Move to rs6000-call.c.
* config/rs6000/rs6000.h (struct altivec_builtin_types): Moved from
rs6000-c.c.
* config/rs6000/rs6000-call.c (rs6000_builtin_info): Make static.
(altivec_overloaded_builtins): Moved from rs6000-c.c.
(rs6000_common_init_builtins): Do no define builtins that overload
builtins that have been disabled.

From-SVN: r278973

[ARM] Improve max_cond_insns setting for Cortex cores

To enable cores to use the correct max_cond_insns setting, use the core-specific
tuning when a CPU/tune is selected unless -mrestrict-it is explicitly set.

On Cortex-A57 this gives 1.1% performance gain on SPECINT2006 as well as a
0.4% codesize reduction.

    gcc/
* config/arm/arm.c (arm_option_override_internal):
Use max_cond_insns from CPU tuning unless -mrestrict-it is used.

From-SVN: r278968

Remove stray comma in primary_constraint_error.

* parser.c (enum primary_constraint_error): Remove stray comma.

From-SVN: r278967

[AArch64] Add support for fused compare and branch

Add support for fused compare with branch.  Rename the existing
AARCH64_FUSE_CMP_BRANCH to ALU_BRANCH, and AARCH64_FUSE_ALU_BRANCH
to ALU_CBZ to make it clear what is being fused.

    gcc/
* config/aarch64/aarch64.c
(thunderxt88_tunings): Use AARCH64_FUSE_ALU_BRANCH.
(thunderx_tunings): Likewise.
(tsv110_tunings): Use AARCH64_FUSE_ALU_BRANCH and AARCH64_FUSE_ALU_CBZ.
(thunderx2t99_tunings): Likewise.
(aarch_macro_fusion_pair_p): Add support for AARCH64_FUSE_CMP_BRANCH.
* config/aarch64/aarch64-fusion-pairs.def: Add ALU_CBZ fusion.

From-SVN: r278966

tree-ssa-sccvn.c (vn_reference_lookup_3): Properly guard empty CTOR and memset partial-def registering.

2019-12-04  Richard Biener  <rguenther@suse.de>

* tree-ssa-sccvn.c (vn_reference_lookup_3): Properly guard
empty CTOR and memset partial-def registering.  Take advantage
of fancy offset analysis in memset handling.

From-SVN: r278965

Fix VIEW_CONVERT_EXPRs for VECTOR_BOOLEAN_TYPE_Ps

In r278410 I added code to handle VIEW_CONVERT_EXPRs between
variable-length vectors.  This included support for decoding
a VECTOR_BOOLEAN_TYPE_P with subbyte elements.

However, it turns out that we were already mishandling such bool vectors
for fixed-length vectors: we treated each element as a stand-alone byte
instead of putting multiple elements into the same byte.  I think in
principle this could have been an issue for AVX512 as well.

This patch adds encoding support for boolean vectors and reuses
a version of the new decode support for fixed-length vectors.

2019-12-04  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* fold-const.c (native_encode_vector_part): Handle
VECTOR_BOOLEAN_TYPE_Ps that have subbyte precision.
(native_decode_vector_tree): Delete, moving the bulk of the code to...
(native_interpret_vector_part): ...this new function.  Use a pointer
and length instead of a vec<> and start index.
(native_interpret_vector): Use native_interpret_vector_part.
(fold_view_convert_vector_encoding): Likewise.

gcc/testsuite/
* gcc.target/aarch64/sve/acle/general/whilelt_5.c: New test.

From-SVN: r278964

tree-ssa-sccvn.c (vn_walk_cb_data::push_partial_def): Handle non-constant defs in the most trivial way.

2019-12-04  Richard Biener  <rguenther@suse.de>

* tree-ssa-sccvn.c (vn_walk_cb_data::push_partial_def): Handle
non-constant defs in the most trivial way.
(vn_reference_lookup_3): Also push down SSA partial defs.

* gcc.dg/tree-ssa/ssa-fre-84.c: New testcase.

From-SVN: r278963

Fortran] PR92754 - fix an issue with resolving intrinsic functions

        gcc/fortran/
        PR fortran/92754
        * intrinsic.c (gfc_intrinsic_func_interface): Set
        sym's flavor, intrinsic and function attribute if
        unset.

        gcc/testsuite/
        PR fortran/92754
        gfortran.dg/intrinsic_9.f90: New.

From-SVN: r278961

Initialize a BB count in switch lowering.

2019-12-04  Martin Liska  <mliska@suse.cz>

* tree-switch-conversion.c (switch_decision_tree::try_switch_expansion):
Initialize count of newly created BB.

From-SVN: r278959

re PR tree-optimization/92734 (Missing match.pd simplification done by fold_binary_loc on generic)

PR tree-optimization/92734
* match.pd ((A +- B) - A -> +- B, (A +- B) -+ B -> A,
A - (A +- B) -> -+ B, A +- (B -+ A) -> +- B): Handle nop_convert.

* gcc.dg/tree-ssa/pr92734-2.c: New test.

From-SVN: r278958

[C++] Opt out of GNU vector extensions for built-in SVE types

This is the C++ equivalent of r277950.  The changes are very similar
to there.  Perhaps the only noteworthy thing (that I know of) is that
the patch continues to treat !gnu_vector_type_p vector types as literal
types/potential constexprs.  Disabling the GNU vector extensions
shouldn't in itself stop the types from being literal types, since
whatever the target provides instead might be constexpr material.

2019-12-04  Richard Sandiford  <richard.sandiford@arm.com>

gcc/cp/
* cp-tree.h (CP_AGGREGATE_TYPE_P): Check for gnu_vector_type_p
instead of VECTOR_TYPE.
* call.c (build_conditional_expr_1): Restrict vector handling
to vectors that satisfy gnu_vector_type_p.
* cvt.c (ocp_convert): Only allow vectors to be converted
to bool if they satisfy gnu_vector_type_p.
(build_expr_type_conversion): Only allow conversions from
vectors if they satisfy gnu_vector_type_p.
* typeck.c (cp_build_binary_op): Only allow binary operators to be
applied to vectors if they satisfy gnu_vector_type_p.
(cp_build_unary_op): Likewise unary operators.
(build_reinterpret_cast_1):

gcc/testsuite/
* g++.target/aarch64/sve/acle/general-c++/gnu_vectors_1.C: New test.
* g++.target/aarch64/sve/acle/general-c++/gnu_vectors_2.C: New test.

From-SVN: r278957

re PR fortran/92756 (ICE in lower_omp, at omp-low.c:12988)

PR fortran/92756
* trans-openmp.c (gfc_trans_omp_teams): Wrap OMP_TEAMS body into a
BIND_EXPR with a forced BLOCK.

* gfortran.dg/gomp/teams1.f90: New test.

* testsuite/libgomp.fortran/teams1.f90: New test.
* testsuite/libgomp.fortran/teams2.f90: New test.

From-SVN: r278956

[rs6000] Fix PR92760 by checking VECTOR_MEM_NONE_P instead

PR92760 exposed one issue that VECTOR_UNIT_NONE_P (V2DImode) is true on Power7
then we won't return it as preferred_simd_mode but ISA 2.06 (Power7) does
introduce partial support on vector doubleword (very limitted) and more basic
support origins from ISA 2.07 (Power8) though.  To make vectorizer still
leverage those few but available V2DImode related instructions, we need to
claim it's available on VSX (Power7 and up).

gcc/ChangeLog

    PR target/92760
    * gcc/config/rs6000/rs6000.c (rs6000_preferred_simd_mode): Use
    VECTOR_MEM_NONE_P instead of VECTOR_UNIT_NONE_P.

From-SVN: r278955

Daily bump.

From-SVN: r278954

libstdc++: Implement spaceship for std::pair (P1614R2)

This defines operator<=> as a non-member function template and does not
alter operator==. This contradicts the changes made by P1614R2, which
specify both as hidden friends, but that specification of operator<=> is
broken and the subject of a soon-to-be-published LWG issue.

* include/bits/stl_pair.h [__cpp_lib_three_way_comparison]
(operator<=>): Define for C++20.
* libsupc++/compare (__cmp2way_res_t): Rename to __cmp3way_res_t,
move into __detail namespace. Do not turn argument types into lvalues.
(__cmp3way_helper): Rename to __cmp3way_res_impl, move into __detail
namespace. Constrain with concepts instead of using void_t.
(compare_three_way_result): Adjust name of base class.
(compare_three_way_result_t): Use __cmp3way_res_impl directly.
(__detail::__3way_cmp_with): Add workaround for PR 91073.
(compare_three_way): Use workaround.
(__detail::__synth3way, __detail::__synth3way_t): Define new helpers
implementing synth-three-way and synth-three-way-result semantics.
* testsuite/20_util/pair/comparison_operators/constexpr_c++20.cc: New
test.

From-SVN: r278951

libstdc++: Fix Doxygen markup error

* include/bits/stl_pair.h (pair): Remove stray Doxygen closing marker.

From-SVN: r278950

cp-tree.h (enum cp_tree_index): Add CPTI_SOURCE_LOCATION_IMPL.

* cp-tree.h (enum cp_tree_index): Add CPTI_SOURCE_LOCATION_IMPL.
(source_location_impl): Define.
(enum cp_built_in_function): Add CP_BUILT_IN_SOURCE_LOCATION.
(fold_builtin_source_location): Declare.
* cp-gimplify.c: Include output.h, file-prefix-map.h and cgraph.h.
(cp_gimplify_expr, cp_fold): Handle CP_BUILT_IN_SOURCE_LOCATION.
Formatting fix.
(get_source_location_impl_type): New function.
(struct source_location_table_entry,
struct source_location_table_entry_hash): New types.
(source_location_table, source_location_id): New variables.
(fold_builtin_source_location): New function.
* constexpr.c (cxx_eval_builtin_function_call): Handle
CP_BUILT_IN_SOURCE_LOCATION.
* tree.c (builtin_valid_in_constant_expr_p): Likewise.  Formatting
fix.
* decl.c (cxx_init_decl_processing): Register
__builtin_source_location.
* name-lookup.c (get_std_name_hint): Add source_location entry.

* g++.dg/cpp2a/srcloc1.C: New test.
* g++.dg/cpp2a/srcloc2.C: New test.
* g++.dg/cpp2a/srcloc3.C: New test.
* g++.dg/cpp2a/srcloc4.C: New test.
* g++.dg/cpp2a/srcloc5.C: New test.
* g++.dg/cpp2a/srcloc6.C: New test.
* g++.dg/cpp2a/srcloc7.C: New test.
* g++.dg/cpp2a/srcloc8.C: New test.
* g++.dg/cpp2a/srcloc9.C: New test.
* g++.dg/cpp2a/srcloc10.C: New test.
* g++.dg/cpp2a/srcloc11.C: New test.
* g++.dg/cpp2a/srcloc12.C: New test.
* g++.dg/cpp2a/srcloc13.C: New test.
* g++.dg/cpp2a/srcloc14.C: New test.

From-SVN: r278949

re PR bootstrap/92783 (SEGV in field_byte_offset)

PR bootstrap/92783
* gcc-interface/utils.c (rest_of_record_type_compilation): Move down
the guard for the position of fields in the descriptive type.

From-SVN: r278948

typeck.c (cp_build_addr_expr_1): Use the cp_expr_loc_or_input_loc location in a few additional diagnostics; tidy.

/cp
2019-12-03  Paolo Carlini  <paolo.carlini@oracle.com>

* typeck.c (cp_build_addr_expr_1): Use the cp_expr_loc_or_input_loc
location in a few additional diagnostics; tidy.
(check_return_expr): Likewise.

* typeck.c (cp_build_addr_expr_1): Use tree_strip_any_location_wrapper
for the address of main pedwarn.

/testsuite
2019-12-03  Paolo Carlini  <paolo.carlini@oracle.com>

* g++.dg/diagnostic/inconsistent-deduction-1.C: New.
* g++.dg/diagnostic/returning-a-value-1.C: Likewise.
* g++.dg/cpp0x/decltype3.C: Check location(s) too.
* g++.dg/cpp0x/decltype4.C: Likewise.
* g++.dg/cpp0x/lambda/lambda-deduce-ext-neg.C: Likewise.
* g++.dg/cpp2a/consteval13.C: Likewise.
* g++.dg/expr/pmf-1.C: Likewise.
* g++.dg/other/ptrmem2.C: Likewise.
* g++.dg/template/ptrmem17.C: Likewise.
* g++.old-deja/g++.bugs/900213_03.C: Likewise.
* g++.old-deja/g++.other/pmf7.C: Likewise.
* g++.old-deja/g++.other/ptrmem7.C: Likewise.

* g++.dg/diagnostic/main2.C: New.

From-SVN: r278947

ipa-fnsummary.c: Include tree-into-ssa.h.

* ipa-fnsummary.c: Include tree-into-ssa.h.
(compute_fn_summary): Call update_ssa.

From-SVN: r278946

re PR c++/91369 (Implement P0784R7: constexpr new)

PR c++/91369
* constexpr.c (struct constexpr_global_ctx): Add cleanups member,
initialize it in the ctor.
(cxx_eval_constant_expression) <case TARGET_EXPR>: If TARGET_EXPR_SLOT
is already in the values hash_map, don't evaluate it again.  Put
TARGET_EXPR_SLOT into hash_map even if not lval, and push it into
save_exprs too.  If there is TARGET_EXPR_CLEANUP and not
CLEANUP_EH_ONLY, push the cleanup to cleanups vector.
<case CLEANUP_POINT_EXPR>: Save outer cleanups, set cleanups to
local auto_vec, after evaluating the body evaluate cleanups and
restore previous cleanups.
<case TRY_CATCH_EXPR>: Don't crash if the first operand is NULL_TREE.
(cxx_eval_outermost_constant_expr): Set cleanups to local auto_vec,
after evaluating the expression evaluate cleanups.

* g++.dg/cpp2a/constexpr-new8.C: New test.

From-SVN: r278945

Clear calls_comdat_local when comdat group is dissolved

while looking into Firefox inlining dumps I noticed that we often do not
inline because we think function calls comdat local while the comdat group
itself has been dissolved.

* cgraph.c (cgraph_node::verify_node): Check that calls_comdat_local
is set only for symbol in comdat group.
* symtab.c (symtab_node::dissolve_same_comdat_group_1): Clear it.

From-SVN: r278944

Do not update SSA in lto-stremaer-in

* cgraph.c: Include tree-into-ssa.h
(cgraph_node::get_body): Call update_ssa.
* cgraphunit.c (cgraph_node::expand): Likewise.
* lto-streamer-in.c (input_function): Do not call update_ssa.

From-SVN: r278943

Don't install unnecessary ARRAY_REF element sizes

Even EXACT_DIV_EXPR doesn't distribute across addition for wrapping
types, so in general we can't fold EXACT_DIV_EXPRs of POLY_INT_CSTs
at compile time.  This was causing an ICE when trying to gimplify the
element size field in an ARRAY_REF.

If the result of that EXACT_DIV_EXPR is an invariant, we don't bother
recording it in the ARRAY_REF and simply read the element size from the
element type.  This avoids the overhead of doing:

      /* ??? tree_ssa_useless_type_conversion will eliminate casts to
 sizetype from another type of the same width and signedness.  */
      if (TREE_TYPE (aligned_size) != sizetype)
aligned_size = fold_convert_loc (loc, sizetype, aligned_size);
      return size_binop_loc (loc, MULT_EXPR, aligned_size,
     size_int (TYPE_ALIGN_UNIT (elmt_type)));

each time array_ref_element_size is called.

So rather than read array_ref_element_size, do some arithmetic on it,
and only then check whether the result is an invariant, we might as
well check whether the element size is an invariant to start with.
We're then directly testing whether array_ref_element_size gives
a reusable value.

For consistency, the patch makes the same change for the offset field
in a COMPONENT_REF, although I don't think that can trigger yet.

2019-12-03  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* gimplify.c (gimplify_compound_lval): Don't gimplify and install
an array element size if array_element_size is already an invariant.
Similarly don't gimplify and install a field offset if
component_ref_field_offset is already an invariant.

gcc/testsuite/
* gcc.target/aarch64/sve/acle/general-c/struct_1.c: New test.

From-SVN: r278942

Mark constant-sized objects as addressable if they have poly-int accesses

If SVE code is written for a specific vector length, it might load from
or store to fixed-sized objects.  This needs to work even without
-msve-vector-bits=N (which should never be needed for correctness).

There's no way of handling a direct poly-int sized reference to a
fixed-size register; it would have to go via memory.  And in that
case it's more efficient to mark the fixed-size object as
addressable from the outset, like we do for array references
with non-constant indices.

2019-12-03  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* cfgexpand.c (discover_nonconstant_array_refs_r): If an access
with POLY_INT_CST size is made to a fixed-size object, force the
object to live in memory.

gcc/testsuite/
* gcc.target/aarch64/sve/acle/general/deref_1.c: New test.

From-SVN: r278941

Add missing amdgcn vcondu patterns

2019-12-03  Andrew Stubbs  <ams@codesourcery.com>

gcc/
* config/gcn/gcn-valu.md: Change "vcondu" patterns to use VEC_1REG_MODE
for the data mode.

From-SVN: r278940

PR c++/91363 - P0960R3: Parenthesized initialization of aggregates.

This patch implements C++20 P0960R3: Parenthesized initialization of aggregates
(<wg21.link/p0960>; see R0 for more background info).  Essentially, if you have
an aggregate, you can now initialize it by (x, y), similarly to {x, y}.  E.g.

  struct A {
    int x, y;
    // no A(int, int) ctor (see paren-init14.C for = delete; case)
  };
  A a(1, 2);

The difference between ()-init and {}-init is that narrowing conversions are
permitted, designators are not permitted, a temporary object bound to
a reference does not have its lifetime extended, and there is no brace elision.
Further, things like

  int a[](1, 2, 3); // will deduce the array size
  const A& r(1, 2.3, 3); // narrowing is OK
  int (&&rr)[](1, 2, 3);
  int b[3](1, 2); // b[2] will be value-initialized

now work as expected.  Note that

  char f[]("fluff");

has always worked and this patch keeps it that way.  Also note that A a((1, 2))
is not the same as A a{{1,2}}; the inner (1, 2) remains a COMPOUND_EXPR.

The approach I took was to handle (1, 2) similarly to {1, 2} -- conjure up
a CONSTRUCTOR, and introduce LOOKUP_AGGREGATE_PAREN_INIT to distinguish
between the two.  This kind of initialization is only supported in C++20;
I've made no attempt to support it in earlier standards, like we don't
support CTAD pre-C++17, for instance.

* c-cppbuiltin.c (c_cpp_builtins): Predefine
__cpp_aggregate_paren_init=201902 for -std=c++2a.

* call.c (build_new_method_call_1): Handle parenthesized initialization
of aggregates by building up a CONSTRUCTOR.
(extend_ref_init_temps): Do nothing for CONSTRUCTOR_IS_PAREN_INIT.
* cp-tree.h (CONSTRUCTOR_IS_PAREN_INIT, LOOKUP_AGGREGATE_PAREN_INIT):
Define.
* decl.c (grok_reference_init): Handle aggregate initialization from
a parenthesized list of values.
(reshape_init): Do nothing for CONSTRUCTOR_IS_PAREN_INIT.
(check_initializer): Handle initialization of an array from a
parenthesized list of values.  Use NULL_TREE instead of NULL.
* tree.c (build_cplus_new): Handle BRACE_ENCLOSED_INITIALIZER_P.
* typeck2.c (digest_init_r): Set LOOKUP_AGGREGATE_PAREN_INIT if it
receives a CONSTRUCTOR with CONSTRUCTOR_IS_PAREN_INIT set.  Allow
narrowing when LOOKUP_AGGREGATE_PAREN_INIT.
(massage_init_elt): Don't lose LOOKUP_AGGREGATE_PAREN_INIT when passing
flags to digest_init_r.

* g++.dg/cpp0x/constexpr-99.C: Only expect an error in C++17 and
lesser.
* g++.dg/cpp0x/explicit7.C: Likewise.
* g++.dg/cpp0x/initlist12.C: Adjust dg-error.
* g++.dg/cpp0x/pr31437.C: Likewise.
* g++.dg/cpp2a/feat-cxx2a.C: Add __cpp_aggregate_paren_init test.
* g++.dg/cpp2a/paren-init1.C: New test.
* g++.dg/cpp2a/paren-init10.C: New test.
* g++.dg/cpp2a/paren-init11.C: New test.
* g++.dg/cpp2a/paren-init12.C: New test.
* g++.dg/cpp2a/paren-init13.C: New test.
* g++.dg/cpp2a/paren-init14.C: New test.
* g++.dg/cpp2a/paren-init15.C: New test.
* g++.dg/cpp2a/paren-init16.C: New test.
* g++.dg/cpp2a/paren-init17.C: New test.
* g++.dg/cpp2a/paren-init18.C: New test.
* g++.dg/cpp2a/paren-init19.C: New test.
* g++.dg/cpp2a/paren-init2.C: New test.
* g++.dg/cpp2a/paren-init3.C: New test.
* g++.dg/cpp2a/paren-init4.C: New test.
* g++.dg/cpp2a/paren-init5.C: New test.
* g++.dg/cpp2a/paren-init6.C: New test.
* g++.dg/cpp2a/paren-init7.C: New test.
* g++.dg/cpp2a/paren-init8.C: New test.
* g++.dg/cpp2a/paren-init9.C: New test.
* g++.dg/ext/desig10.C: Adjust dg-error.
* g++.dg/template/crash107.C: Likewise.
* g++.dg/template/crash95.C: Likewise.
* g++.old-deja/g++.jason/crash3.C: Likewise.
* g++.old-deja/g++.law/ctors11.C: Likewise.
* g++.old-deja/g++.law/ctors9.C: Likewise.
* g++.old-deja/g++.mike/net22.C: Likewise.
* g++.old-deja/g++.niklas/t128.C: Likewise.

From-SVN: r278939

re PR target/92758 (r278833 breaks gcc.target/powerpc/fold-vec-splat-floatdouble.c)

2019-12-03  Richard Biener  <rguenther@suse.de>

PR tree-optimization/92758
* tree-ssa-forwprop.c (simplify_vector_constructor): Restore
operation on uniform vectors.

From-SVN: r278938

Validate acc_device_t uses

Check that function arguments of type acc_device_t
are valid enumeration values in all publicly visible
functions from oacc-init.c.

2019-12-03  Frederik Harwath  <frederik@codesourcery.com>

libgomp/
* oacc-init.c (acc_known_device_type): Add function.
(unknown_device_type_error): Add function.
  (name_of_acc_device_t): Change to call unknown_device_type_error
on unknown type.
(resolve_device): Use acc_known_device_type.
  (acc_init): Fail if acc_device_t argument is not valid.
  (acc_shutdown): Likewise.
  (acc_get_num_devices): Likewise.
  (acc_set_device_type): Likewise.
(acc_get_device_num): Likewise.
(acc_set_device_num): Likewise.
  (acc_on_device): Add comment that argument validity is not checked.

Reviewed-by: Thomas Schwinge <thomas@codesourcery.com>
From-SVN: r278937

Enable OpenACC GCN testing.

2019-12-03  Andrew Stubbs  <ams@codesourcery.com>

libgomp/
* testsuite/lib/libgomp.exp (offload_target_to_openacc_device_type):
Recognize amdgcn.
(check_effective_target_openacc_amdgcn_accel_present): New proc.
(check_effective_target_openacc_amdgcn_accel_selected): New proc.
* testsuite/libgomp.oacc-c++/c++.exp: Add support for amdgcn.
* testsuite/libgomp.oacc-c/c.exp: Likewise.
* testsuite/libgomp.oacc-fortran/fortran.exp: Likewise.

From-SVN: r278935

re PR tree-optimization/92645 (Hand written vector code is 450 times slower when compiled with GCC compared to Clang)

2019-12-03  Richard Biener  <rguenther@suse.de>

PR tree-optimization/92645
* gimple-fold.c (gimple_fold_builtin_memory_op): Fold memcpy
from or to a properly aligned register variable.

* gcc.target/i386/pr92645-5.c: New testcase.

From-SVN: r278934

Makefile.in (SOURCES): Add doc/lto-dump.1.

2019-12-03  Matthias Klose  <doko@ubuntu.com>

        * Makefile.in (SOURCES): Add doc/lto-dump.1.
        (install-man): Add $(LTO_DUMP_INSTALL_NAME)$(man1ext).
        ($(LTO_DUMP_INSTALL_NAME)$(man1ext): New.

From-SVN: r278933

musl: Fix invalid tls model in libgomp and libitm PR91938

Musl does not support initial-exec tls in dynamically loaded shared
libraries.

libgomp/ChangeLog:

2019-12-03  Szabolcs Nagy  <szabolcs.nagy@arm.com>

PR libgomp/91938
* configure.tgt: Avoid IE tls on *-*-musl*.

libitm/ChangeLog:

2019-12-03  Szabolcs Nagy  <szabolcs.nagy@arm.com>

PR libgomp/91938
* configure.tgt: Avoid IE tls on *-*-musl*.

From-SVN: r278932

re PR tree-optimization/92751 (VN partial def support confused about clobbers)

2019-12-03  Richard Biener  <rguenther@suse.de>

PR tree-optimization/92751
* tree-ssa-sccvn.c (vn_walk_cb_data::push_partial_def): Fail
when a clobber ends up in the partial-def vector.
(vn_reference_lookup_3): Let clobbers be handled by the
assignment from CTOR handling.

* g++.dg/tree-ssa/pr92751.C: New testcase.

From-SVN: r278931

utils.c (potential_alignment_gap): Delete.

* gcc-interface/utils.c (potential_alignment_gap): Delete.
(rest_of_record_type_compilation): Do not call above function.  Use
the alignment of the field instead of that of its type, if need be.
When the original field has variable size, always lower the alignment
of the pointer type.  Reset the bit-field status of the new field if
it does not encode a bit-field.

From-SVN: r278930

utils.c (fold_convert_size): New function.

* gcc-interface/utils.c (fold_convert_size): New function.
(fold_bit_position): Invoke it to do further folding.

From-SVN: r278929

XFAIL loop_versioning_6.f90 for ! lp64

2019-12-03  Richard Sandiford  <richard.sandiford@arm.com>

gcc/testsuite/
* gfortran.dg/loop_versioning_6.f90: XFAIL the scans for ! lp64.

From-SVN: r278928

decl.c (gnat_to_gnu_subprog_type): With the Copy-In/ Copy-Out mechanism...

* gcc-interface/decl.c (gnat_to_gnu_subprog_type): With the Copy-In/
Copy-Out mechanism, do not promote the mode of the return type to an
integral mode if it contains a field on a non-integral type and even
demote it for 64-bit targets.

From-SVN: r278927

libstdc++: Fix copyright date on new test header

The slow_clock type was introduced to the testsuite in 2018 in the
testsuite/30_threads/condition_variable/members/2.cc test, so the new
header should have that date.

* testsuite/util/slow_clock.h: Fix copyright date.

From-SVN: r278926

re PR tree-optimization/92734 (Missing match.pd simplification done by fold_binary_loc on generic)

PR tree-optimization/92734
* match.pd ((CST1 - A) +- CST2 -> CST3 - A,
CST1 - (CST2 - A) -> CST3 + A): Handle nop casts around
inner subtraction.

* gcc.dg/tree-ssa/pr92734.c: New test.

From-SVN: r278925

re PR target/92744 (error: insn does not satisfy its constraints since r278439)

PR target/92744
* config/i386/i386.md (peephole2 for *swap<mode>): Use
general_reg_operand predicates instead of register_operand.

* g++.dg/dfp/pr92744.C: New test.

From-SVN: r278924

re PR c++/92732 (Bit-field of scoped enumeration type cannot be initialized)

PR c++/92732
* typeck2.c (digest_nsdmi_init): For bitfields, use
DECL_BIT_FIELD_TYPE instead of TREE_TYPE.

* g++.dg/cpp2a/bitfield3.C: Don't expect narrowing conversion
warnings.
* g++.dg/cpp2a/bitfield4.C: New test.

From-SVN: r278923