Adjust two_valued_val_range_p for irange API.

gcc/ChangeLog:

* vr-values.c (simplify_using_ranges::two_valued_val_range_p):
Use irange API.

Adjust simplify_conversion_using_ranges for irange API.

gcc/ChangeLog:

* vr-values.c (simplify_conversion_using_ranges): Convert to irange API.

Use irange API in test_for_singularity.

gcc/ChangeLog:

* vr-values.c (test_for_singularity): Use irange API.
(simplify_using_ranges::simplify_cond_using_ranges_1): Do not
special case VR_RANGE.

Adjust vrp_evaluate_conditional for irange API.

gcc/ChangeLog:

* vr-values.c (simplify_using_ranges::vrp_evaluate_conditional): Adjust
for irange API.

Adjust op_with_boolean_value_range_p for irange API.

gcc/ChangeLog:

* vr-values.c (simplify_using_ranges::op_with_boolean_value_range_p): Adjust
for irange API.

Adjust get_range_info to use the base irange class.

gcc/ChangeLog:

* tree-ssanames.c (get_range_info): Use irange instead of value_range.
* tree-ssanames.h (get_range_info): Same.

Adjust expr_not_equal_to to use irange API.

gcc/ChangeLog:

* fold-const.c (expr_not_equal_to): Adjust for irange API.

Remove ad-hoc range canonicalization from determine_block_size.

Anti ranges of ~[MIN,X] are automatically canonicalized to [X+1,MAX],
at creation time.  There is no need to handle them specially.

Tested by adding a gcc_unreachable and bootstrapping/testing.

gcc/ChangeLog:

* builtins.c (determine_block_size): Remove ad-hoc range canonicalization.

dse: Remove partial load after full store for high part access[PR71309]

v5 update as comments:
1. Move const_rhs out of loop;
2. Iterate from int size for read_mode.

This patch could optimize(works for char/short/int/void*):

6: r119:TI=[r118:DI+0x10]
7: [r118:DI]=r119:TI
8: r121:DI=[r118:DI+0x8]

=>

6: r119:TI=[r118:DI+0x10]
16: r122:DI=r119:TI#8

Final ASM will be as below without partial load after full store(stxv+ld):
  ld 10,16(3)
  mr 9,3
  ld 3,24(3)
  std 10,0(9)
  std 3,8(9)
  blr

It could achieve ~25% performance improvement for typical cases on
Power9.  Bootstrap and regression tested on Power9-LE.

For AArch64, one ldr is replaced by mov with this patch:

ldp     x2, x3, [x0, 16]
stp     x2, x3, [x0]
ldr     x0, [x0, 8]

=>

mov     x1, x0
ldp     x2, x0, [x0, 16]
stp     x2, x0, [x1]

gcc/ChangeLog:

2020-08-04  Xionghu Luo  <luoxhu@linux.ibm.com>

PR rtl-optimization/71309
* dse.c (find_shift_sequence): Use subreg of shifted from high part
register to avoid loading from address.

gcc/testsuite/ChangeLog:

2020-08-04  Xionghu Luo  <luoxhu@linux.ibm.com>

PR rtl-optimization/71309
* gcc.target/powerpc/pr71309.c: New test.

Daily bump.

c++: Remove unused declaration.

gcc/cp/ChangeLog:

* cp-tree.h (after_nsdmi_defaulted_late_checks): Remove.

libgcc: increase required stack space for x86_64 -fsplit-stack

This accomodates increased space required by use of the xsavec
instruction in the dynamic linker trampoline.

libgcc/ChangeLog:

* config/i386/morestack.S (BACKOFF) [x86_64]: Add 2048 bytes.

rs6000: Fix vector_float.c testcase for -m32

It should be skipped then.

2020-08-03  Segher Boessenkool  <segher@kernel.crashing.org>

gcc/testsuite/
* gcc.target/powerpc/vector_float.c: Skip if not lp64.

c++: Variable template and template parameter pack [PR96218]

This is DR 2032 which says that the restrictions regarding template
parameter packs and default arguments apply to variable templates as
well, but we weren't detecting that.

gcc/cp/ChangeLog:

DR 2032
PR c++/96218
* pt.c (check_default_tmpl_args): Also consider variable
templates.

gcc/testsuite/ChangeLog:

DR 2032
PR c++/96218
* g++.dg/cpp1y/var-templ67.C: New test.

aarch64: Fix up __aarch64_cas16_acq_rel fallback

As mentioned in the PR, the fallback path when LSE is unavailable writes
incorrect registers to the memory if the previous content compares equal
to x0, x1 - it writes copy of x0, x1 from the start of function, but it
should write x2, x3.

2020-08-03  Jakub Jelinek  <jakub@redhat.com>

PR target/96402
* config/aarch64/lse.S (__aarch64_cas16_acq_rel): Use x2, x3 instead
of x(tmp0), x(tmp1) in STXP arguments.

* gcc.target/aarch64/pr96402.c: New test.

cpp: Do not use @dots for ... tokens in code examples

This prevents a ... token in code examples from being turned into a
single HORIZONTAL ELLIPSIS glyph (e.g. via the HTML &hellip; entity).

gcc/ChangeLog:

* doc/cpp.texi (Variadic Macros): Use the exact ... token in
code examples.

Refer to C++20

I noticed a bunch of references to c++2a.

gcc/
* doc/invoke.texi: Refer to c++20

openacc: No attach/detach present/release mappings for array descriptors

Standalone attach and detach clauses should not create present/release
mappings for Fortran array descriptors (e.g. used when we have a pointer
to an array), both because it is unnecessary and because those mappings
will be incorrectly subject to reference counting. Simply omitting the
mappings means we just use GOMP_MAP_TO_PSET and GOMP_MAP_{ATTACH,DETACH}
mappings for array descriptors.

That requires a tweak in gimplify.c, since we may now see GOMP_MAP_TO_PSET
without a preceding data-movement mapping.

2020-08-03  Julian Brown  <julian@codesourcery.com>
    Thomas Schwinge  <thomas@codesourcery.com>

gcc/fortran/
* trans-openmp.c (gfc_trans_omp_clauses): Don't create present/release
mappings for array descriptors.

gcc/
* gimplify.c (gimplify_omp_target_update): Allow GOMP_MAP_TO_PSET
without a preceding data-movement mapping.

gcc/testsuite/
* gfortran.dg/goacc/attach-descriptor.f90: Update pattern output. Add
scanning of gimplify dump.

libgomp/
* testsuite/libgomp.oacc-fortran/attach-descriptor-1.f90: Don't run for
shared-memory devices.  Extend with further checking.

Co-Authored-By: Thomas Schwinge <thomas@codesourcery.com>

Darwin: Guard two macros in darwin.h.

Work on the Arm64 port shows that these two macros can be declared
ahead of the version in darwin.h which needs to override (for X86
and PPC this wasn't needed).

gcc/ChangeLog:

* config/darwin.h (ASM_DECLARE_FUNCTION_NAME): UNDEF before
use.
(DEF_MIN_OSX_VERSION): Only define if there's no existing
def.

Darwin: Handle poly_int machine_modes.

The common code that selects suitable sections for literals needs
to inspect the machine_mode.  For some sub-targets that might be
represented as a poly-int.

There was a workaround in place that allowed for cases where the poly
int had only one component.  This removes the workaround and handles
the cases where we care about the machine_mode size.

gcc/ChangeLog:

* config/darwin.c (IN_TARGET_CODE): Remove.
(darwin_mergeable_constant_section): Handle poly-int machine modes.
(machopic_select_rtx_section): Likewise.

internal/syscall/unix: correct ia64 syscall numbers

Per Andreas Schwab.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/246264

internal/syscall/unix: define copyFileRangeTrap for all architectures

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/246363

Avoid shifting by amounts larger than target int in irange self-tests.

gcc/ChangeLog:

PR tree-optimization/96430
* range-op.cc (operator_tests): Do not shift by 31 on targets with
integer's smaller than 32 bits.

Removal of HSA offloading from gcc and libgomp

This patch removes the generation of HSAIL from the compiler, the HSA
offloading plugin from libgomp and the associated testsuite tests and
infrastructure bits from the respective testsuites.

Apart from removal of the obvious files, I removed bits that I found
by searching for HSA related terms and by re-tracing my steps and
looking at the patches that introduced HSA in the first place.  I did
not remove everything these patches brought in, for example:

  - the mechanism to pass offload-target specific info from the application to
    the offloading plugin - but the same mechanism is also used to
    communicate number of teams and the thread limit to all offload targets.

  - run_func hook in gomp_device_descr stays too, although now it is
    not used.  If some future offload target would like the ability to
    refuse to offload some functions, it can use it.  It is easy to
    remove as a follow-up if it is considered clutter, though.

  - configure options --with-hsa-runtime=PATH, -with-hsa-runtime-include=PATH
    and --with-hsa-runtime-lib=PATH rmeain because GCN uses them too.

  - Surprisingly, GOMP_TARGET_ARG_HSA_KERNEL_ATTRIBUTES (a constant
    from gomp-constants.h) appears in the source of the amdgcn libgomp
    plugin, although I tend to think that code path is not ever used
    and this patch certainly removes it from the compiler.
    Nevertheless, it seems it has potential value beyond HSAIL and so
    I've kept it, it can of course always be easily removed in the
    future of GCN folk abandon it too.

  - I assume constants OFFLOAD_TARGET_TYPE_HSA and GOMP_DEVICE_HSA
    need to stay indefinitely too just so that no future offload
    target picks that number.

  - I have kept dg-require-effective-target
    offload_device_nonshared_as requirement of thests which have it.

It is quite probable I missed some small HSA artifacts but those
should be easy to remove later as we find them.

include/ChangeLog:

2020-07-24  Martin Jambor  <mjambor@suse.cz>

* gomp-constants.h (GOMP_VERSION_HSA): Remove.

gcc/ChangeLog:

2020-07-24  Martin Jambor  <mjambor@suse.cz>

* hsa-brig-format.h: Moved to brig/brigfrontend.
* hsa-brig.c: Removed.
* hsa-builtins.def: Likewise.
* hsa-common.c: Likewise.
* hsa-common.h: Likewise.
* hsa-dump.c: Likewise.
* hsa-gen.c: Likewise.
* hsa-regalloc.c: Likewise.
* ipa-hsa.c: Likewise.
* omp-grid.c: Likewise.
* omp-grid.h: Likewise.
* Makefile.in (BUILTINS_DEF): Remove hsa-builtins.def.
(OBJS): Remove hsa-common.o, hsa-gen.o, hsa-regalloc.o, hsa-brig.o,
hsa-dump.o, ipa-hsa.c and omp-grid.o.
(GTFILES): Removed hsa-common.c and omp-expand.c.
* builtins.def: Remove processing of hsa-builtins.def.
(DEF_HSA_BUILTIN): Remove.
* common.opt (flag_disable_hsa): Remove.
(-Whsa): Ignore.
* config.in (ENABLE_HSA): Removed.
* configure.ac: Removed handling configuration for hsa offloading.
(ENABLE_HSA): Removed.
* configure: Regenerated.
* doc/install.texi (--enable-offload-targets): Remove hsa from the
example.
(--with-hsa-runtime): Reword to reference any HSA run-time, not
specifically HSA offloading.
* doc/invoke.texi (Option Summary): Remove -Whsa.
(Warning Options): Likewise.
(Optimize Options): Remove hsa-gen-debug-stores.
* doc/passes.texi (Regular IPA passes): Remove section on IPA HSA
pass.
* gimple-low.c (lower_stmt): Remove GIMPLE_OMP_GRID_BODY case.
* gimple-pretty-print.c (dump_gimple_omp_for): Likewise.
(dump_gimple_omp_block): Likewise.
(pp_gimple_stmt_1): Likewise.
* gimple-walk.c (walk_gimple_stmt): Likewise.
* gimple.c (gimple_build_omp_grid_body): Removed function.
(gimple_copy): Remove GIMPLE_OMP_GRID_BODY case.
* gimple.def (GIMPLE_OMP_GRID_BODY): Removed.
* gimple.h (gf_mask): Removed GF_OMP_PARALLEL_GRID_PHONY,
OMP_FOR_KIND_GRID_LOOP, GF_OMP_FOR_GRID_PHONY,
GF_OMP_FOR_GRID_INTRA_GROUP, GF_OMP_FOR_GRID_GROUP_ITER and
GF_OMP_TEAMS_GRID_PHONY.  Renumbered GF_OMP_FOR_KIND_SIMD and
GF_OMP_TEAMS_HOST.
(gimple_build_omp_grid_body): Removed declaration.
(gimple_has_substatements): Remove GIMPLE_OMP_GRID_BODY case.
(gimple_omp_for_grid_phony): Removed.
(gimple_omp_for_set_grid_phony): Likewise.
(gimple_omp_for_grid_intra_group): Likewise.
(gimple_omp_for_grid_intra_group): Likewise.
(gimple_omp_for_grid_group_iter): Likewise.
(gimple_omp_for_set_grid_group_iter): Likewise.
(gimple_omp_parallel_grid_phony): Likewise.
(gimple_omp_parallel_set_grid_phony): Likewise.
(gimple_omp_teams_grid_phony): Likewise.
(gimple_omp_teams_set_grid_phony): Likewise.
(CASE_GIMPLE_OMP): Remove GIMPLE_OMP_GRID_BODY case.
* lto-section-in.c (lto_section_name): Removed hsa.
* lto-streamer.h (lto_section_type): Removed LTO_section_ipa_hsa.
* lto-wrapper.c (compile_images_for_offload_targets): Remove special
handling of hsa.
* omp-expand.c: Do not include hsa-common.h and gt-omp-expand.h.
(parallel_needs_hsa_kernel_p): Removed.
(grid_launch_attributes_trees): Likewise.
(grid_launch_attributes_trees): Likewise.
(grid_create_kernel_launch_attr_types): Likewise.
(grid_insert_store_range_dim): Likewise.
(grid_get_kernel_launch_attributes): Likewise.
(get_target_arguments): Remove code passing HSA grid sizes.
(grid_expand_omp_for_loop): Remove.
(grid_arg_decl_map): Likewise.
(grid_remap_kernel_arg_accesses): Likewise.
(grid_expand_target_grid_body): Likewise.
(expand_omp): Remove call to grid_expand_target_grid_body.
(omp_make_gimple_edges): Remove GIMPLE_OMP_GRID_BODY case.
* omp-general.c: Do not include hsa-common.h.
(omp_maybe_offloaded): Do not check for HSA offloading.
(omp_context_selector_matches): Likewise.
* omp-low.c: Do not include hsa-common.h and omp-grid.h.
(build_outer_var_ref): Remove handling of GIMPLE_OMP_GRID_BODY.
(scan_sharing_clauses): Remove handling of OMP_CLAUSE__GRIDDIM_.
(scan_omp_parallel): Remove handling of the phoney variant.
(check_omp_nesting_restrictions): Remove handling of
GIMPLE_OMP_GRID_BODY and GF_OMP_FOR_KIND_GRID_LOOP.
(scan_omp_1_stmt): Remove handling of GIMPLE_OMP_GRID_BODY.
(lower_omp_for_lastprivate): Remove handling of gridified loops.
(lower_omp_for): Remove phony loop handling.
(lower_omp_taskreg): Remove phony construct handling.
(lower_omp_teams): Likewise.
(lower_omp_grid_body): Removed.
(lower_omp_1): Remove GIMPLE_OMP_GRID_BODY case.
(execute_lower_omp): Do not call omp_grid_gridify_all_targets.
* opts.c (common_handle_option): Do not handle hsa when processing
OPT_foffload_.
* params.opt (hsa-gen-debug-stores): Remove.
* passes.def: Remove pass_ipa_hsa and pass_gen_hsail.
* timevar.def: Remove TV_IPA_HSA.
* toplev.c: Do not include hsa-common.h.
(compile_file): Do not call hsa_output_brig.
* tree-core.h (enum omp_clause_code): Remove OMP_CLAUSE__GRIDDIM_.
(tree_omp_clause): Remove union field dimension.
* tree-nested.c (convert_nonlocal_omp_clauses): Remove the
OMP_CLAUSE__GRIDDIM_ case.
(convert_local_omp_clauses): Likewise.
* tree-pass.h (make_pass_gen_hsail): Remove declaration.
(make_pass_ipa_hsa): Likewise.
* tree-pretty-print.c (dump_omp_clause): Remove GIMPLE_OMP_GRID_BODY
case.
* tree.c (omp_clause_num_ops): Remove the element corresponding to
OMP_CLAUSE__GRIDDIM_.
(omp_clause_code_name): Likewise.
(walk_tree_1): Remove GIMPLE_OMP_GRID_BODY case.
* tree.h (OMP_CLAUSE__GRIDDIM__DIMENSION): Remove.
(OMP_CLAUSE__GRIDDIM__SIZE): Likewise.
(OMP_CLAUSE__GRIDDIM__GROUP): Likewise.

gcc/fortran/ChangeLog:

2020-07-24  Martin Jambor  <mjambor@suse.cz>

* f95-lang.c (gfc_init_builtin_functions): Remove processing of
hsa-builtins.def.

gcc/brig/ChangeLog:

2020-07-24  Martin Jambor  <mjambor@suse.cz>

* brigfrontend/brig-util.h (hsa_type_packed_p): Declared.
* brigfrontend/brig-util.cc (hsa_type_packed_p): Moved here from
removed gcc/hsa-common.c.

libgomp/ChangeLog:

2020-07-24  Martin Jambor  <mjambor@suse.cz>

* plugin/Makefrag.am: Remove configuration of HSA plugin.
* aclocal.m4: Regenerated.
* Makefile.in: Regenerated.
* config.h.in: Regenerated.
* configure: Regenerated.
* plugin/configfrag.ac: Likewise.
* plugin/hsa_ext_finalize.h: Removed.
* plugin/plugin-hsa.c: Likewise.
* testsuite/Makefile.in: Regenerated.
* testsuite/lib/libgomp.exp
(offload_target_to_openacc_device_type): Remove hsa case.
(check_effective_target_hsa_offloading_selected_nocache): Removed
(check_effective_target_hsa_offloading_selected): Likewise.
(libgomp_init): Do not add -Wno-hsa to additional_flags.
* testsuite/libgomp.hsa.c/alloca-1.c: Removed test.
* testsuite/libgomp.hsa.c/bitfield-1.c: Likewise.
* testsuite/libgomp.hsa.c/bits-insns.c: Likewise.
* testsuite/libgomp.hsa.c/builtins-1.c: Likewise.
* testsuite/libgomp.hsa.c/c.exp: Likewise.
* testsuite/libgomp.hsa.c/complex-1.c: Likewise.
* testsuite/libgomp.hsa.c/complex-align-2.c: Likewise.
* testsuite/libgomp.hsa.c/formal-actual-args-1.c: Likewise.
* testsuite/libgomp.hsa.c/function-call-1.c: Likewise.
* testsuite/libgomp.hsa.c/get-level-1.c: Likewise.
* testsuite/libgomp.hsa.c/gridify-1.c: Likewise.
* testsuite/libgomp.hsa.c/gridify-2.c: Likewise.
* testsuite/libgomp.hsa.c/gridify-3.c: Likewise.
* testsuite/libgomp.hsa.c/gridify-4.c: Likewise.
* testsuite/libgomp.hsa.c/memory-operations-1.c: Likewise.
* testsuite/libgomp.hsa.c/pr69568.c: Likewise.
* testsuite/libgomp.hsa.c/pr82416.c: Likewise.
* testsuite/libgomp.hsa.c/rotate-1.c: Likewise.
* testsuite/libgomp.hsa.c/staticvar.c: Likewise.
* testsuite/libgomp.hsa.c/switch-1.c: Likewise.
* testsuite/libgomp.hsa.c/switch-branch-1.c: Likewise.
* testsuite/libgomp.hsa.c/switch-sbr-2.c: Likewise.
* testsuite/libgomp.hsa.c/tiling-1.c: Likewise.
* testsuite/libgomp.hsa.c/tiling-2.c: Likewise.

gcc/testsuite/ChangeLog:

2020-07-24  Martin Jambor  <mjambor@suse.cz>

* lib/target-supports.exp (check_effective_target_offload_hsa):
Removed.
* c-c++-common/gomp/gridify-1.c: Removed test.
* c-c++-common/gomp/gridify-2.c: Likewise.
* c-c++-common/gomp/gridify-3.c: Likewise.
* c-c++-common/gomp/hsa-indirect-call-1.c: Likewise.
* gfortran.dg/gomp/gridify-1.f90: Likewise.
* gcc.dg/gomp/gomp.exp: Do not pass -Wno-hsa to tests.
* g++.dg/gomp/gomp.exp: Likewise.
* gfortran.dg/gomp/gomp.exp: Likewise.

aarch64: Add support for unpacked sub [PR96366]

The test case bb-slp-20.c in the gcc testsuit will cause an
ICE in the expand pass due to the lack of a pattern for
subtraction of the VNx2SI mode. This patch solve this problem
by adding support for unpacked sub.

gcc/ChangeLog:

* config/aarch64/aarch64-sve.md (sub<mode>3): Add support for
unpacked vectors.

testsuite: Add -Wno-psabi to gcc.dg/pr96377-[12].c

2020-08-03  Richard Sandiford  <richard.sandiford@arm.com>

gcc/testsuite/
* gcc.dg/pr96377-1.c: Add -Wno-psabi.
* gcc.dg/pr96377-2.c: Likewise.

MSP430: Don't pass redundant -md option to the assembler

The MSP430 GAS option "-md" is supposed to indicate that the CRT startup
code should copy data from ROM to RAM at startup. However, this option
has no effect; GAS handles the related behaviour automatically.

gcc/ChangeLog:

* config/msp430/msp430.h (ASM_SPEC): Don't pass on "-md" option.

regrename: Avoid disrupting SMS schedule [PR95696]

SMS is performed before reload, and each insn in SMS schedule uses
pseudo-register.  After reload, regrename pass try to adjust the hard
registers with def/use chain created by build_def_use.  For now, regrename
pass isn't aware of VLIW bundles created by SMS, it may updated a register
which may not be really unused, which will causes invalid VLIW bundles.
Before the final schedule, we recheck the validation of VLIW bundles and
reschedule the conflicted insns to avoid the above issue.  Rescheduling
the conflicted insns will destroy SMS schedule of the kernel loop, which
would be harmful to performance.

2020-08-03  Yunde Zhong  <zhongyunde@huawei.com>

gcc/
PR rtl-optimization/95696
* regrename.c (regrename_analyze): New param include_all_block_p
with default value TRUE.  If set to false, avoid disrupting SMS
schedule.
* regrename.h (regrename_analyze): Adjust prototype.

lto/96385 - avoid unused global UNDEFs in debug objects

Unused global UNDEFs can have side-effects in some circumstances so
the following patch avoids them by treating them the same as other
to be discarded DEFs - make them local.

2020-08-03  Richard Biener  <rguenther@suse.de>

PR lto/96385
libiberty/
* simple-object-elf.c
(simple_object_elf_copy_lto_debug_sections): Localize global
UNDEFs and reuse the prevailing name.

doc: fix a typo in tm.texi

gcc/
* doc/tm.texi.in (VECTOR_STORE_FLAG_VALUE): Fix a typo.
* doc/tm.texi: Regenerate.

doc: Add missing comma after octeontx2f95mm

gcc/
* doc/invoke.texi: Add missing comma after octeontx2f95mm entry.

aarch64: Add A64FX machine model

This patch add support for Fujitsu A64FX, as the first step of adding
A64FX machine model.

A64FX is used in FUJITSU Supercomputer PRIMEHPC FX1000,
PRIMEHPC FX700, and supercomputer Fugaku.
The official microarchitecture information of A64FX can be read at
https://github.com/fujitsu/A64FX.

2020-08-03  Qian jianhua  <qianjh@cn.fujitsu.com>

gcc/
* config/aarch64/aarch64-cores.def (a64fx): New core.
* config/aarch64/aarch64-tune.md: Regenerated.
* config/aarch64/aarch64.c (a64fx_prefetch_tune, a64fx_tunings): New.
* doc/invoke.texi: Add a64fx to the list.

PR rtl-optimization 61494: Preserve x-0.0 with HONOR_SNANS.

The following patch avoids simplifying x-0.0 to x when -fsignaling-nans
is specified, which resolves PR rtl-optimization 61494.  Indeed, running
the test program attached to that PR now reports no failures.

2020-08-02  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
PR rtl-optimization/61494
* simplify-rtx.c (simplify_binary_operation_1) [MINUS]: Don't
simplify x - 0.0 with -fsignaling-nans.

genmatch: Avoid unused parameter warnings in generated code.

This patch silences a number of unused parameter warnings whilst
compiling both generic-match.c and gimple-match.c.  The problem is
that multiple (polymorphic) functions are generated for generic_simplify
and gimple_simplify, each handling tree codes with a specific number
of children.  Currently, there are no simplifications for tree codes
with four or five children, leading to functions with "empty" bodies
and unused function arguments.  This patch detects those cases, and
generates stub functions (with anonymous arguments) to silence these
warnings.

2020-08-03  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
* genmatch.c (decision_tree::gen): Emit stub functions for
tree code operand counts that have no simplifications.
(main): Correct comment typo.

tree-optimization: Fix typos in comments

The only two changes which aren't obvious are s/dirified/specified/ and
s/edirially/especially/ which appear to be caused by a s/spec/dir/ edit
that went too far.

gcc/ChangeLog:

* gimple-ssa-sprintf.c: Fix typos in comments.

AArch64: Fix hwasan failure in readline.

My previous fix added an unchecked call to fgets in the new function readline.
fgets can fail when there's an error reading the file in which case it returns
NULL.  It also returns NULL when the next character is EOF.

The EOF case is already covered by the existing code but the error case isn't.
This fixes it by returning the empty string on error.

Also I now use strnlen instead of strlen to make sure we never read outside the
buffer.

This was flagged by Matthew Malcomson during his hwasan work.

gcc/ChangeLog:

* config/aarch64/driver-aarch64.c (readline): Check return value fgets.

mark match.pd ! not implemented on GENERIC

This makes us error when the ! operator modifier is encountered
when not targeting GIMPLE.

2020-08-03  Richard Biener  <rguenther@suse.de>

* genmatch.c (parser::gimple): New.
(parser::parser): Initialize gimple flag member.
(parser::parse_expr): Error on ! operator modifier when
not targeting GIMPLE.
(main): Pass down gimple flag to parser ctor.

* doc/match-and-simplify.texi: Amend accordingly.

d: Fix ICE using non-local variable: internal compiler error: Segmentation fault

Moves no frame access error to own function, adding use of it for both
when get_framedecl() cannot find a path to the outer function frame, and
guarding get_decl_tree() from recursively calling itself.

gcc/d/ChangeLog:

PR d/96254
* d-codegen.cc (error_no_frame_access): New.
(get_frame_for_symbol): Use fdparent name in error message.
(get_framedecl): Replace call to assert with error.
* d-tree.h (error_no_frame_access): Declare.
* decl.cc (get_decl_tree): Detect recursion and error.

gcc/testsuite/ChangeLog:

PR d/96254
* gdc.dg/pr96254a.d: New test.
* gdc.dg/pr96254b.d: New test.

libgfortran/caf/single.c: Fix typo.

libgfortran/ChangeLog

* caf/single.c (_gfortran_caf_lock): Fix typo.

Fortran texi: Fix typos

gcc/fortran/ChangeLog

* gfc-internals.texi: Fix typos.
* gfortran.texi: Likewise.
* intrinsic.texi: Likewise.
* invoke.texi: Likewise.

Multi-range implementation for value_range (irange).

Implement class irange, a generic multi-range implementation for
value ranges.  This class is API compatible with value_range, and is meant
to seamlessly coexist with it.

gcc/ChangeLog:

* Makefile.in (GTFILES): Move value-range.h up.
* gengtype-lex.l: Set yylval to handle GTY markers on templates.
* ipa-cp.c (initialize_node_lattices): Call value_range
constructor.
(ipcp_propagate_stage): Use in-place new so value_range construct
is called.
* ipa-fnsummary.c (evaluate_conditions_for_known_args): Use std
vec instead of GCC's vec<>.
(evaluate_properties_for_edge): Adjust for std vec.
(ipa_fn_summary_t::duplicate): Same.
(estimate_ipcp_clone_size_and_time): Same.
* ipa-prop.c (ipa_get_value_range): Use in-place new for
value_range.
* ipa-prop.h (struct GTY): Remove class keyword for m_vr.
* range-op.cc (empty_range_check): Rename to...
(empty_range_varying): ...this and adjust for varying.
(undefined_shift_range_check): Adjust for irange.
(range_operator::wi_fold): Same.
(range_operator::fold_range): Adjust for irange.  Special case
single pairs for performance.
(range_operator::op1_range): Adjust for irange.
(range_operator::op2_range): Same.
(value_range_from_overflowed_bounds): Same.
(value_range_with_overflow): Same.
(create_possibly_reversed_range): Same.
(range_true): Same.
(range_false): Same.
(range_true_and_false): Same.
(get_bool_state):  Adjust for irange and tweak for performance.
(operator_equal::fold_range): Adjust for irange.
(operator_equal::op1_range): Same.
(operator_equal::op2_range): Same.
(operator_not_equal::fold_range): Same.
(operator_not_equal::op1_range): Same.
(operator_not_equal::op2_range): Same.
(build_lt): Same.
(build_le): Same.
(build_gt): Same.
(build_ge): Same.
(operator_lt::fold_range): Same.
(operator_lt::op1_range): Same.
(operator_lt::op2_range): Same.
(operator_le::fold_range): Same.
(operator_le::op1_range): Same.
(operator_le::op2_range): Same.
(operator_gt::fold_range): Same.
(operator_gt::op1_range): Same.
(operator_gt::op2_range): Same.
(operator_ge::fold_range): Same.
(operator_ge::op1_range): Same.
(operator_ge::op2_range): Same.
(operator_plus::wi_fold): Same.
(operator_plus::op1_range): Same.
(operator_plus::op2_range): Same.
(operator_minus::wi_fold): Same.
(operator_minus::op1_range): Same.
(operator_minus::op2_range): Same.
(operator_min::wi_fold): Same.
(operator_max::wi_fold): Same.
(cross_product_operator::wi_cross_product): Same.
(operator_mult::op1_range): New.
(operator_mult::op2_range): New.
(operator_mult::wi_fold): Adjust for irange.
(operator_div::wi_fold): Same.
(operator_exact_divide::op1_range): Same.
(operator_lshift::fold_range): Same.
(operator_lshift::wi_fold): Same.
(operator_lshift::op1_range): New.
(operator_rshift::op1_range): New.
(operator_rshift::fold_range): Adjust for irange.
(operator_rshift::wi_fold): Same.
(operator_cast::truncating_cast_p): Abstract out from
operator_cast::fold_range.
(operator_cast::fold_range): Adjust for irange and tweak for
performance.
(operator_cast::inside_domain_p): Abstract out from fold_range.
(operator_cast::fold_pair): Same.
(operator_cast::op1_range): Use abstracted methods above.  Adjust
for irange and tweak for performance.
(operator_logical_and::fold_range): Adjust for irange.
(operator_logical_and::op1_range): Same.
(operator_logical_and::op2_range): Same.
(unsigned_singleton_p): New.
(operator_bitwise_and::remove_impossible_ranges): New.
(operator_bitwise_and::fold_range): New.
(wi_optimize_and_or):  Adjust for irange.
(operator_bitwise_and::wi_fold): Same.
(set_nonzero_range_from_mask): New.
(operator_bitwise_and::simple_op1_range_solver): New.
(operator_bitwise_and::op1_range): Adjust for irange.
(operator_bitwise_and::op2_range): Same.
(operator_logical_or::fold_range): Same.
(operator_logical_or::op1_range): Same.
(operator_logical_or::op2_range): Same.
(operator_bitwise_or::wi_fold): Same.
(operator_bitwise_or::op1_range): Same.
(operator_bitwise_or::op2_range): Same.
(operator_bitwise_xor::wi_fold): Same.
(operator_bitwise_xor::op1_range): New.
(operator_bitwise_xor::op2_range): New.
(operator_trunc_mod::wi_fold):  Adjust for irange.
(operator_logical_not::fold_range): Same.
(operator_logical_not::op1_range): Same.
(operator_bitwise_not::fold_range): Same.
(operator_bitwise_not::op1_range): Same.
(operator_cst::fold_range): Same.
(operator_identity::fold_range): Same.
(operator_identity::op1_range): Same.
(class operator_unknown): New.
(operator_unknown::fold_range): New.
(class operator_abs): Adjust for irange.
(operator_abs::wi_fold): Same.
(operator_abs::op1_range): Same.
(operator_absu::wi_fold): Same.
(class operator_negate): Same.
(operator_negate::fold_range): Same.
(operator_negate::op1_range): Same.
(operator_addr_expr::fold_range): Same.
(operator_addr_expr::op1_range): Same.
(pointer_plus_operator::wi_fold): Same.
(pointer_min_max_operator::wi_fold): Same.
(pointer_and_operator::wi_fold): Same.
(pointer_or_operator::op1_range): New.
(pointer_or_operator::op2_range): New.
(pointer_or_operator::wi_fold):  Adjust for irange.
(integral_table::integral_table): Add entries for IMAGPART_EXPR
and POINTER_DIFF_EXPR.
(range_cast):  Adjust for irange.
(build_range3): New.
(range3_tests): New.
(widest_irange_tests): New.
(multi_precision_range_tests): New.
(operator_tests): New.
(range_tests): New.
* range-op.h (class range_operator): Adjust for irange.
(range_cast): Same.
* tree-vrp.c (range_fold_binary_symbolics_p): Adjust for irange and
tweak for performance.
(range_fold_binary_expr): Same.
(masked_increment): Change to extern.
* tree-vrp.h (masked_increment): New.
* tree.c (cache_wide_int_in_type_cache): New function abstracted
out from wide_int_to_tree_1.
(wide_int_to_tree_1): Cache 0, 1, and MAX for pointers.
* value-range-equiv.cc (value_range_equiv::deep_copy): Use kind
method.
(value_range_equiv::move): Same.
(value_range_equiv::check): Adjust for irange.
(value_range_equiv::intersect): Same.
(value_range_equiv::union_): Same.
(value_range_equiv::dump): Same.
* value-range.cc (irange::operator=): Same.
(irange::maybe_anti_range): New.
(irange::copy_legacy_range): New.
(irange::set_undefined): Adjust for irange.
(irange::swap_out_of_order_endpoints): Abstract out from set().
(irange::set_varying): Adjust for irange.
(irange::irange_set): New.
(irange::irange_set_anti_range): New.
(irange::set): Adjust for irange.
(value_range::set_nonzero): Move to header file.
(value_range::set_zero): Move to header file.
(value_range::check): Rename to...
(irange::verify_range): ...this.
(value_range::num_pairs): Rename to...
(irange::legacy_num_pairs): ...this, and adjust for irange.
(value_range::lower_bound): Rename to...
(irange::legacy_lower_bound): ...this, and adjust for irange.
(value_range::upper_bound): Rename to...
(irange::legacy_upper_bound): ...this, and adjust for irange.
(value_range::equal_p): Rename to...
(irange::legacy_equal_p): ...this.
(value_range::operator==): Move to header file.
(irange::equal_p): New.
(irange::symbolic_p): Adjust for irange.
(irange::constant_p): Same.
(irange::singleton_p): Same.
(irange::value_inside_range): Same.
(irange::may_contain_p): Same.
(irange::contains_p): Same.
(irange::normalize_addresses): Same.
(irange::normalize_symbolics): Same.
(irange::legacy_intersect): Same.
(irange::legacy_union): Same.
(irange::union_): Same.
(irange::intersect): Same.
(irange::irange_union): New.
(irange::irange_intersect): New.
(subtract_one): New.
(irange::invert): Adjust for irange.
(dump_bound_with_infinite_markers): New.
(irange::dump): Adjust for irange.
(debug): Add irange versions.
(range_has_numeric_bounds_p): Adjust for irange.
(vrp_val_max): Move to header file.
(vrp_val_min): Move to header file.
(DEFINE_INT_RANGE_GC_STUBS): New.
(DEFINE_INT_RANGE_INSTANCE): New.
* value-range.h (class irange): New.
(class int_range): New.
(class value_range): Rename to a instantiation of int_range.
(irange::legacy_mode_p): New.
(value_range::value_range): Remove.
(irange::kind): New.
(irange::num_pairs): Adjust for irange.
(irange::type): Adjust for irange.
(irange::tree_lower_bound): New.
(irange::tree_upper_bound): New.
(irange::type): Adjust for irange.
(irange::min): Same.
(irange::max): Same.
(irange::varying_p): Same.
(irange::undefined_p): Same.
(irange::zero_p): Same.
(irange::nonzero_p): Same.
(irange::supports_type_p): Same.
(range_includes_zero_p): Same.
(gt_ggc_mx): New.
(gt_pch_nx): New.
(irange::irange): New.
(int_range::int_range): New.
(int_range::operator=): New.
(irange::set): Moved from value-range.cc and adjusted for irange.
(irange::set_undefined): Same.
(irange::set_varying): Same.
(irange::operator==): Same.
(irange::lower_bound): Same.
(irange::upper_bound): Same.
(irange::union_): Same.
(irange::intersect): Same.
(irange::set_nonzero): Same.
(irange::set_zero): Same.
(irange::normalize_min_max): New.
(vrp_val_max): Move from value-range.cc.
(vrp_val_min): Same.
* vr-values.c (vr_values::get_lattice_entry): Call value_range
constructor.

d: Merge upstream dmd c2274e56a (PR96250).

1. Fixes an ICE in the front-end if a struct symbol were to appear twice
in the compilation unit.

2. Fixes a rejects-valid bug in the front-end where `(symbol)' was being
resolved as a `var' expression, instead of `this.var'.

Reviewed-on: https://github.com/dlang/dmd/pull/11436
     https://github.com/dlang/dmd/pull/11439

gcc/d/ChangeLog:

PR d/96250
* dmd/MERGE: Merge upstream dmd c2274e56a.

Daily bump.

var-tracking: fix uninitialised use of 'in_pending' [PR96404]

r11-2447-g:1212cfad093 ("Improve var-tracking dataflow
iteration order") changed 'in_pending' initialization
from:

    in_pending = sbitmap_alloc (last_basic_block_for_fn (cfun));
    bitmap_ones (in_pending);

to more complex partial bit population algorithm. Due to presence
of uninitialized bits gcc started injecting extra debug entries
in seemigly arbitrary locations and started failing stage2/stage3
bootstrap comparison.

valgrind detected unilitialized bits as:

  Conditional jump or move depends on uninitialised value(s)
     at 0xDBED3B: vt_find_locations() (var-tracking.c:7230)
     by 0xDBF2FB: variable_tracking_main_1() (var-tracking.c:10519)
     ...
   Uninitialised value was created by a heap allocation
     at 0x483779F: malloc (vg_replace_malloc.c:307)
     by 0x14EE80B: xmalloc (xmalloc.c:147)
     by 0x14911F9: sbitmap_alloc(unsigned int) (sbitmap.c:51)
     ...

The fix explicitly initializes 'in_pending' bitmap with zeros.

2020-08-02  Sergei Trofimovich  <siarheit@google.com>

gcc/

PR bootstrap/96404
* var-tracking.c (vt_find_locations): Fully initialize
all 'in_pending' bits.

Update ChangeLogs for PR96320

This patch fixes PR96320. See the explanatory comment in the testcase.

2020-08-01  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
PR target/96320
* interface.c (gfc_check_dummy_characteristics): If a module
procedure arrives with assumed shape in the interface and
deferred shape in the procedure itself, update the latter and
copy the lower bounds.

gcc/testsuite/
PR target/96320
* gfortran.dg/module_procedure_4.f90 : New test.

Update ChangeLogs for PR96325

This patch fixes PR96325. See the explanatory comment in the testcase.

2020-08-02  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
PR fortran/96325
* primary.c (gfc_match_varspec): In the case that a component
reference is added to an intrinsic type component, emit the
error message in this function.

gcc/testsuite/
PR fortran/96325
* gfortran.dg/pr96325.f90: New test.
* gfortran.dg/pr91589.f90: Update error message.

Daily bump.

Move www.stroustrup.com to https

libstdc++-v3/ChangeLog:

2020-08-02  Gerald Pfeifer  <gerald@pfeifer.com>

* doc/xml/manual/using_exceptions.xml: Move www.stroustrup.com to
https.
* doc/html/manual/using_exceptions.html: Regenerate.

libgo: update to go1.15rc1

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/245157

Verify symtab order

* symtab.c (symtab_node::verify_base): Verify order.
(symtab_node::verify_symtab_nodes): Verify order.

Cap frequency of recursive calls by 90%

* predict.c (estimate_bb_frequencies): Cap recursive calls by 90%.

c: Fix bogus vector initialisation error [PR96377]

One of the problems in this PR was that if we had:

  vector_type1 array[] = { vector_value1 };

process_init_element would only treat vector_value1 as initialising
a vector_type1 if they had the same TYPE_MAIN_VARIANT.  This has
several problems:

(1) It gives confusing error messages if the vector types are
    incompatible.  (Tested by gcc.dg/pr96377-1.c.)

(2) It means that we reject code that should be valid with
    -flax-vector-conversions.  (Tested by gcc.dg/pr96377-2.c.)

(3) On arm and aarch64 targets, it means that we reject some
    initializers that mix Advanced SIMD and standard GNU vectors.
    These vectors have traditionally had different TYPE_MAIN_VARIANTs
    because they have different mangling schemes.  (Tested by
    gcc.dg/pr96377-[3-6].c.)

(4) It means that we reject SVE initializers that should be valid.
    (Tested by gcc.target/aarch64/sve/gnu_vectors_[34].c.)

(5) After r11-1741-g:31427b974ed7b7dd54e2 we reject:

      arm_neon_type1 array[] = { k ^ arm_neon_value1 };

    because applying the binary operator to arm_neon_value1 strips
    the "Advanced SIMD type" attributes that were added in that patch.
    Stripping the attributes is problematic for other reasons though,
    so that still needs to be fixed separately.

g++.target/aarch64/sve/gnu_vectors_[34].C already pass.

gcc/c/
PR c/96377
* c-typeck.c (process_init_element): Split test for whether to
recurse into a record, union or array into...
(initialize_elementwise_p): ...this new function.  Don't recurse
into a vector type if the initialization value is also a vector.

gcc/testsuite/
PR c/96377
* gcc.dg/pr96377-1.c: New test.
* gcc.dg/pr96377-2.c: Likewise.
* gcc.dg/pr96377-3.c: Likewise.
* gcc.dg/pr96377-4.c: Likewise.
* gcc.dg/pr96377-5.c: Likewise.
* gcc.dg/pr96377-6.c: Likewise.
* gcc.target/aarch64/pr96377-1.c: Likewise.
* gcc.target/aarch64/sve/acle/general-c/gnu_vectors_3.c: Likewise.
* gcc.target/aarch64/sve/acle/general-c/gnu_vectors_4.c: Likewise.
* g++.target/aarch64/sve/acle/general-c++/gnu_vectors_3.C: Likewise.
* g++.target/aarch64/sve/acle/general-c++/gnu_vectors_4.C: Likewise.

C-SKY: Add -mfloat-abi= option.

gcc/ChangeLog:

* config/csky/csky_opts.h (float_abi_type): New.
* config/csky/csky.h (TARGET_SOFT_FLOAT): New.
(TARGET_HARD_FLOAT): New.
(TARGET_HARD_FLOAT_ABI): New.
(OPTION_DEFAULT_SPECS): Use mfloat-abi.
* config/csky/csky.opt (mfloat-abi): New.
* doc/invoke.texi (C-SKY Options): Document -mfloat-abi=.

C-SKY: Delete big endian CPUs' mutilib for linux gcc.

gcc/

* config/csky/t-csky-linux: Delete big endian CPUs' multilib.

gcc.dg/loop-8.c: Skip for mmix.

This test fails for mmix for (almost) the same reason it would fail
for e.g. mipsel-elf: the end-condition of the loop tests against a
register set to a constant, and that register is (one of) the
"unexpected IV" moved out of the loop "without introducing a new
temporary register" and making the dump contain more than one
"Decided", causing a non-matching loop2 dump.  The test should
probably have been restricted to just the original target for which a
problem was observed to be fixed.

gcc/testsuite:
* gcc.dg/loop-8.c: Skip for mmix.

Daily bump.

RISC-V/libgcc: Reduce the size of RV64 millicode by 6 bytes

Rewrite code sequences throughout the 64-bit RISC-V `__riscv_save_*'
routines replacing `li t1, -48', `li t1, -64', and `li t1, -80',
instructions, which do not have a compressed encoding, respectively with
`li t1, 3', `li t1, 4', and `li t1, 4', which do, and then adjusting the
remaining code accordingly observing that `sub sp, sp, t1' takes the
same amount of space as an `slli t1, t1, 4'/`add sp, sp, t1' instruction
pair does, again due to the use of compressed encodings, saving 6 bytes
total.

This change does increase code size by 4 bytes for RISC-V processors
lacking the compressed instruction set, however their users couldn't
care about the code size or they would have chosen an implementation
that does have the compressed instructions, wouldn't they?

libgcc/
* config/riscv/save-restore.S [__riscv_xlen == 64]
(__riscv_save_10, __riscv_save_8, __riscv_save_6, __riscv_save_4)
(__riscv_save_2): Replace negative immediates used for the final
stack pointer adjustment with positive ones, right-shifted by 4.

libstdc++: ParallelSTL is now part of oneAPI DPC++ Library

libstdc++-v3:
2020-07-31  Gerald Pfeifer  <gerald@pfeifer.com>

* doc/xml/manual/status_cxx2017.xml: ParallelSTL is now part
of oneAPI DPC++ Library on Github.
* doc/html/manual/status.html: Regenerate.

libstdc++: Fix and improve std::vector<bool> implementation.

Do not consider allocator noexcept qualification for vector<bool> move
constructor.
Improve swap performance using TBAA like in main vector implementation. Bypass
_M_initialize_dispatch/_M_assign_dispatch in post-c++11 modes.

libstdc++-v3/ChangeLog:

* include/bits/stl_bvector.h
[_GLIBCXX_INLINE_VERSION](_Bvector_impl_data::_M_start): Define as
_Bit_type*.
(_Bvector_impl_data(const _Bvector_impl_data&)): Default.
(_Bvector_impl_data(_Bvector_impl_data&&)): Delegate to latter.
(_Bvector_impl_data::operator=(const _Bvector_impl_data&)): Default.
(_Bvector_impl_data::_M_move_data(_Bvector_impl_data&&)): Use latter.
(_Bvector_impl_data::_M_reset()): Likewise.
(_Bvector_impl_data::_M_swap_data): New.
(_Bvector_impl::_Bvector_impl(_Bvector_impl&&)): Implement explicitely.
(_Bvector_impl::_Bvector_impl(_Bit_alloc_type&&, _Bvector_impl&&)): New.
(_Bvector_base::_Bvector_base(_Bvector_base&&, const allocator_type&)):
New, use latter.
(vector::vector(vector&&, const allocator_type&, true_type)): New, use
latter.
(vector::vector(vector&&, const allocator_type&, false_type)): New.
(vector::vector(vector&&, const allocator_type&)): Use latters.
(vector::vector(const vector&, const allocator_type&)): Adapt.
[__cplusplus >= 201103](vector::vector(_InputIt, _InputIt,
const allocator_type&)): Use _M_initialize_range.
(vector::operator[](size_type)): Use iterator operator[].
(vector::operator[](size_type) const): Use const_iterator operator[].
(vector::swap(vector&)): Add assertions on allocators. Use _M_swap_data.
[__cplusplus >= 201103](vector::insert(const_iterator, _InputIt,
_InputIt)): Use _M_insert_range.
(vector::_M_initialize(size_type)): Adapt.
[__cplusplus >= 201103](vector::_M_initialize_dispatch): Remove.
[__cplusplus >= 201103](vector::_M_insert_dispatch): Remove.
* python/libstdcxx/v6/printers.py (StdVectorPrinter._iterator): Stop
using start _M_offset.
(StdVectorPrinter.to_string): Likewise.
* testsuite/23_containers/vector/bool/allocator/swap.cc: Adapt.
* testsuite/23_containers/vector/bool/cons/noexcept_move_construct.cc:
Add check.

c++: Use error_at rather than warning_at for missing return in constexpr functions [PR96182]

For C++11 we already emit an error if a constexpr function doesn't contain
a return statement, because in C++11 that is the only thing it needs to
contain, but for C++14 we would normally issue a -Wreturn-type warning.

As mentioned by Jonathan, such constexpr functions are invalid, no
diagnostics required, because there doesn't exist any arguments for
which it would result in valid constant expression.

This raises it to an error in such cases.  The !LAMBDA_TYPE_P case
is to avoid error on g++.dg/pr81194.C where the user didn't write
constexpr anywhere and the operator() is compiler generated.

2020-07-31  Jakub Jelinek  <jakub@redhat.com>

PR c++/96182
* decl.c (finish_function): In constexpr functions use for C++14 and
later error instead of warning if no return statement is present and
diagnose it regardless of warn_return_type.  Move the warn_return_type
diagnostics earlier in the function.

* g++.dg/cpp1y/constexpr-96182.C: New test.
* g++.dg/other/error35.C (S<T>::g()): Add return statement.
* g++.dg/cpp1y/pr63996.C (foo): Likewise.
* g++.dg/cpp1y/constexpr-return2.C (f): Likewise.
* g++.dg/cpp1y/var-templ44.C (make_array): Add throw 1.

libstdc++: Fix tests that fail for C++98

libstdc++-v3/ChangeLog:

* testsuite/27_io/basic_istream/ignore/char/94749.cc: Use 0
instead of nullptr.
* testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc:
Likewise.

libstdc++: Fix test that fails for C++98

Local classes have no linkage so cannot be used as template arguments in
C++98.

libstdc++-v3/ChangeLog:

* testsuite/20_util/specialized_algorithms/uninitialized_fill_n/sizes.cc:
Move struct to namespace scope.

libstdc++: Avoid using __float128 in strict modes

libstdc++-v3/ChangeLog:

* testsuite/26_numerics/numbers/float128.cc: Check
__STRICT_ANSI__ before using __float128.
* testsuite/std/concepts/concepts.lang/concept.arithmetic/floating_point.cc:
Likewise.

libstdc++: Ensure c++NN effective-target present in more tests

Add effective-target keywords to tests that would fail for certain
standard modes without the -std=gnu++NN option.

libstdc++-v3/ChangeLog:

* testsuite/18_support/set_terminate.cc: Require C++11 or
higher.
* testsuite/28_regex/simple_c++11.cc: Likewise.
* testsuite/tr1/headers/c++200x/complex.cc: Likewise.
* testsuite/24_iterators/headers/iterator/synopsis.cc:
Require C++14 or lower.

libstdc++: Add dg-require-effective-target to std::span assert tests

The current dg directives say that the tests can run for any standard
mode, but should fail for C++20. What we want is that they only run for
C++20, and are always expected to fail.

libstdc++-v3/ChangeLog:

* testsuite/23_containers/span/back_assert_neg.cc: Split c++2a
effective-target from xfail selector.
* testsuite/23_containers/span/first_2_assert_neg.cc: Likewise.
* testsuite/23_containers/span/first_assert_neg.cc: Likewise.
* testsuite/23_containers/span/front_assert_neg.cc: Likewise.
* testsuite/23_containers/span/index_op_assert_neg.cc: Likewise.
* testsuite/23_containers/span/last_2_assert_neg.cc: Likewise.
* testsuite/23_containers/span/last_assert_neg.cc: Likewise.
* testsuite/23_containers/span/subspan_2_assert_neg.cc:
Likewise.
* testsuite/23_containers/span/subspan_3_assert_neg.cc:
Likewise.
* testsuite/23_containers/span/subspan_4_assert_neg.cc:
Likewise.
* testsuite/23_containers/span/subspan_5_assert_neg.cc:
Likewise.
* testsuite/23_containers/span/subspan_6_assert_neg.cc:
Likewise.
* testsuite/23_containers/span/subspan_assert_neg.cc: Likewise.

libstdc++: Use c++NN_only effective target to tests

Some tests really are only intended for a specific -std mode, so add a
target selector to make that explicit.

Also reorder the dg-do directives to come after the dg-options ones, so
that the target selector in the dg-do directive is applied after the
dg-options that sets the -std option.

libstdc++-v3/ChangeLog:

* testsuite/20_util/reference_wrapper/83427.cc: Adjust
effective-target to specific language mode only.
* testsuite/24_iterators/headers/iterator/range_access_c++11.cc:
Likewise.
* testsuite/24_iterators/headers/iterator/range_access_c++14.cc:
Likewise.
* testsuite/24_iterators/headers/iterator/synopsis_c++11.cc:
Likewise.
* testsuite/24_iterators/headers/iterator/synopsis_c++14.cc:
Likewise.
* testsuite/26_numerics/valarray/69116.cc:
Likewise.
* testsuite/30_threads/headers/condition_variable/std_c++0x_neg.cc:
Remove whitespace at end of file.
* testsuite/30_threads/headers/future/std_c++0x_neg.cc:
Likewise.

libstdc++: Ensure c++NN effective target present in all C++17 tests

Also reorder some directives so that the dg-options setting -std=gnu++17
comes before the dg-do that requires c++17.

libstdc++-v3/ChangeLog:

* testsuite/17_intro/headers/c++2017/all_attributes.cc: Add
c++17 effective-target.
* testsuite/17_intro/headers/c++2017/all_no_exceptions.cc:
Likewise.
* testsuite/17_intro/headers/c++2017/all_no_rtti.cc: Likewise.
* testsuite/17_intro/headers/c++2017/all_pedantic_errors.cc:
Likewise.
* testsuite/17_intro/headers/c++2017/operator_names.cc:
Likewise.
* testsuite/17_intro/headers/c++2017/stdc++.cc: Likewise.
* testsuite/17_intro/headers/c++2017/stdc++_multiple_inclusion.cc:
Likewise.
* testsuite/18_support/uncaught_exceptions/uncaught_exceptions.cc:
Likewise.
* testsuite/19_diagnostics/error_code/is_error_code_v.cc:
Likewise.
* testsuite/20_util/any/assign/1.cc: Likewise.
* testsuite/20_util/any/assign/2.cc: Likewise.
* testsuite/20_util/any/assign/emplace.cc: Likewise.
* testsuite/20_util/any/assign/exception.cc: Likewise.
* testsuite/20_util/any/assign/self.cc: Likewise.
* testsuite/20_util/any/cons/1.cc: Likewise.
* testsuite/20_util/any/cons/2.cc: Likewise.
* testsuite/20_util/any/cons/aligned.cc: Likewise.
* testsuite/20_util/any/cons/explicit.cc: Likewise.
* testsuite/20_util/any/cons/in_place.cc: Likewise.
* testsuite/20_util/any/cons/nontrivial.cc: Likewise.
* testsuite/20_util/any/make_any.cc: Likewise.
* testsuite/20_util/any/misc/any_cast.cc: Likewise.
* testsuite/20_util/any/misc/any_cast_no_rtti.cc: Likewise.
* testsuite/20_util/any/misc/swap.cc: Likewise.
* testsuite/20_util/any/modifiers/1.cc: Likewise.
* testsuite/20_util/any/observers/type.cc: Likewise.
* testsuite/20_util/any/requirements.cc: Likewise.
* testsuite/20_util/any/typedefs.cc: Likewise.
* testsuite/20_util/as_const/1.cc: Likewise.
* testsuite/20_util/as_const/rvalue_neg.cc: Likewise.
* testsuite/20_util/bind/is_placeholder_v.cc: Likewise.
* testsuite/20_util/bool_constant/requirements.cc: Likewise.
* testsuite/20_util/duration/requirements/treat_as_floating_point_v.cc:
Likewise.
* testsuite/20_util/duration_cast/rounding.cc: Likewise.
* testsuite/20_util/enable_shared_from_this/members/weak_from_this.cc:
Likewise.
* testsuite/20_util/function_objects/invoke/59768.cc: Likewise.
* testsuite/20_util/function_objects/not_fn/1.cc: Likewise.
* testsuite/20_util/function_objects/searchers.cc: Likewise.
* testsuite/20_util/in_place/requirements.cc: Likewise.
* testsuite/20_util/is_invocable/requirements/explicit_instantiation.cc:
Likewise.
* testsuite/20_util/is_invocable/requirements/typedefs.cc:
Likewise.
* testsuite/20_util/is_invocable/value.cc: Likewise.
* testsuite/20_util/is_nothrow_invocable/requirements/explicit_instantiation.cc:
Likewise.
* testsuite/20_util/is_nothrow_invocable/requirements/typedefs.cc:
Likewise.
* testsuite/20_util/is_nothrow_swappable/requirements/explicit_instantiation.cc:
Likewise.
* testsuite/20_util/is_nothrow_swappable/requirements/typedefs.cc:
Likewise.
* testsuite/20_util/is_nothrow_swappable/value.cc: Likewise.
* testsuite/20_util/is_nothrow_swappable_with/requirements/explicit_instantiation.cc:
Likewise.
* testsuite/20_util/is_nothrow_swappable_with/requirements/typedefs.cc:
Likewise.
* testsuite/20_util/is_nothrow_swappable_with/value.cc:
Likewise.
* testsuite/20_util/is_swappable/requirements/explicit_instantiation.cc:
Likewise.
* testsuite/20_util/is_swappable/requirements/typedefs.cc:
Likewise.
* testsuite/20_util/is_swappable/value.cc: Likewise.
* testsuite/20_util/is_swappable_with/requirements/explicit_instantiation.cc:
Likewise.
* testsuite/20_util/is_swappable_with/requirements/typedefs.cc:
Likewise.
* testsuite/20_util/is_swappable_with/value.cc: Likewise.
* testsuite/20_util/logical_traits/requirements/explicit_instantiation.cc:
Likewise.
* testsuite/20_util/logical_traits/requirements/typedefs.cc:
Likewise.
* testsuite/20_util/logical_traits/value.cc: Likewise.
* testsuite/20_util/optional/constexpr/make_optional.cc: Likewise.
* testsuite/20_util/optional/constexpr/observers/2.cc: Likewise.
* testsuite/20_util/optional/constexpr/observers/3.cc: Likewise.
* testsuite/20_util/optional/hash.cc: Likewise.
* testsuite/20_util/pair/swap_cxx17.cc: Likewise.
* testsuite/20_util/ratio/requirements/ratio_equal_v.cc: Likewise.
* testsuite/20_util/shared_ptr/requirements/weak_type.cc:
Likewise.
* testsuite/20_util/specialized_algorithms/memory_management_tools/1.cc:
Likewise.
* testsuite/20_util/tuple/apply/1.cc: Likewise.
* testsuite/20_util/tuple/make_from_tuple/1.cc: Likewise.
* testsuite/20_util/tuple/swap_cxx17.cc: Likewise.
* testsuite/20_util/tuple/tuple_size_v.cc: Likewise.
* testsuite/20_util/unique_ptr/specialized_algorithms/swap_cxx17.cc:
Likewise.
* testsuite/20_util/uses_allocator/requirements/uses_allocator_v.cc:
Likewise.
* testsuite/20_util/variant/any.cc: Likewise.
* testsuite/20_util/variant/compile.cc: Likewise.
* testsuite/20_util/variant/hash.cc: Likewise.
* testsuite/20_util/variant/index_type.cc: Likewise.
* testsuite/20_util/variant/run.cc: Likewise.
* testsuite/20_util/void_t/1.cc: Likewise.
* testsuite/21_strings/basic_string/79162.cc: Likewise.
* testsuite/21_strings/basic_string/cons/char/7.cc: Likewise.
* testsuite/21_strings/basic_string/cons/wchar_t/7.cc: Likewise.
* testsuite/21_strings/basic_string/lwg2758.cc: Likewise.
* testsuite/21_strings/basic_string/lwg2946.cc: Likewise.
* testsuite/21_strings/basic_string/modifiers/append/char/4.cc:
Likewise.
* testsuite/21_strings/basic_string/modifiers/append/wchar_t/4.cc:
Likewise.
* testsuite/21_strings/basic_string/modifiers/assign/char/4.cc:
Likewise.
* testsuite/21_strings/basic_string/modifiers/assign/wchar_t/4.cc:
Likewise.
* testsuite/21_strings/basic_string/modifiers/insert/char/3.cc:
Likewise.
* testsuite/21_strings/basic_string/modifiers/insert/wchar_t/3.cc:
Likewise.
* testsuite/21_strings/basic_string/modifiers/replace/char/7.cc:
Likewise.
* testsuite/21_strings/basic_string/modifiers/replace/wchar_t/7.cc:
Likewise.
* testsuite/21_strings/basic_string/operations/compare/char/2.cc:
Likewise.
* testsuite/21_strings/basic_string/operations/compare/wchar_t/2.cc:
Likewise.
* testsuite/21_strings/basic_string/operations/data/char/2.cc:
Likewise.
* testsuite/21_strings/basic_string/operations/data/wchar_t/2.cc:
Likewise.
* testsuite/21_strings/basic_string/operations/find/char/5.cc:
Likewise.
* testsuite/21_strings/basic_string/operations/find/wchar_t/5.cc:
Likewise.
* testsuite/21_strings/basic_string/operators/char/5.cc: Likewise.
* testsuite/21_strings/basic_string/operators/wchar_t/5.cc:
Likewise.
* testsuite/21_strings/basic_string_view/capacity/1.cc: Likewise.
* testsuite/21_strings/basic_string_view/cons/char/1.cc: Likewise.
* testsuite/21_strings/basic_string_view/cons/char/2.cc: Likewise.
* testsuite/21_strings/basic_string_view/cons/char/3.cc: Likewise.
* testsuite/21_strings/basic_string_view/cons/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/cons/wchar_t/2.cc:
Likewise.
* testsuite/21_strings/basic_string_view/cons/wchar_t/3.cc:
Likewise.
* testsuite/21_strings/basic_string_view/element_access/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/element_access/char/2.cc:
Likewise.
* testsuite/21_strings/basic_string_view/element_access/char/empty.cc:
Likewise.
* testsuite/21_strings/basic_string_view/element_access/char/front_back.cc:
Likewise.
* testsuite/21_strings/basic_string_view/element_access/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/element_access/wchar_t/2.cc:
Likewise.
* testsuite/21_strings/basic_string_view/element_access/wchar_t/empty.cc:
Likewise.
* testsuite/21_strings/basic_string_view/element_access/wchar_t/front_back.cc:
Likewise.
* testsuite/21_strings/basic_string_view/include.cc: Likewise.
* testsuite/21_strings/basic_string_view/inserters/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/inserters/char/2.cc:
Likewise.
* testsuite/21_strings/basic_string_view/inserters/char/3.cc:
Likewise.
* testsuite/21_strings/basic_string_view/inserters/pod/10081-out.cc:
Likewise.
* testsuite/21_strings/basic_string_view/inserters/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/inserters/wchar_t/2.cc:
Likewise.
* testsuite/21_strings/basic_string_view/inserters/wchar_t/3.cc:
Likewise.
* testsuite/21_strings/basic_string_view/literals/types-char8_t.cc:
Likewise.
* testsuite/21_strings/basic_string_view/literals/types.cc:
Likewise.
* testsuite/21_strings/basic_string_view/literals/values-char8_t.cc:
Likewise.
* testsuite/21_strings/basic_string_view/literals/values.cc:
Likewise.
* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/compare/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/compare/char/13650.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/compare/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/compare/wchar_t/13650.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/copy/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/copy/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/data/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/data/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/find/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/find/char/2.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/find/char/3.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/find/char/4.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/find/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/find/wchar_t/2.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/find/wchar_t/3.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/find/wchar_t/4.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/rfind/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/rfind/char/2.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/rfind/char/3.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/rfind/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/rfind/wchar_t/2.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/rfind/wchar_t/3.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/string_conversion/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/substr/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/operations/substr/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/range_access/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/range_access/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char16_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char32_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char8_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/requirements/typedefs.cc:
Likewise.
* testsuite/21_strings/basic_string_view/typedefs.cc: Likewise.
* testsuite/21_strings/basic_string_view/types/1.cc: Likewise.
* testsuite/23_containers/array/specialized_algorithms/swap_cxx17.cc:
Likewise.
* testsuite/23_containers/map/modifiers/extract.cc: Likewise.
* testsuite/23_containers/map/modifiers/insert_or_assign/1.cc:
Likewise.
* testsuite/23_containers/map/modifiers/merge.cc: Likewise.
* testsuite/23_containers/map/modifiers/try_emplace/1.cc: Likewise.
* testsuite/23_containers/multimap/modifiers/extract.cc: Likewise.
* testsuite/23_containers/multimap/modifiers/merge.cc: Likewise.
* testsuite/23_containers/multiset/modifiers/extract.cc: Likewise.
* testsuite/23_containers/multiset/modifiers/merge.cc: Likewise.
* testsuite/23_containers/set/modifiers/extract.cc: Likewise.
* testsuite/23_containers/set/modifiers/merge.cc: Likewise.
* testsuite/23_containers/unordered_map/modifiers/extract.cc:
Likewise.
* testsuite/23_containers/unordered_map/modifiers/insert_or_assign.cc:
Likewise.
* testsuite/23_containers/unordered_map/modifiers/merge.cc:
Likewise.
* testsuite/23_containers/unordered_map/modifiers/try_emplace.cc:
Likewise.
* testsuite/23_containers/unordered_multimap/modifiers/extract.cc:
Likewise.
* testsuite/23_containers/unordered_multimap/modifiers/merge.cc:
Likewise.
* testsuite/23_containers/unordered_multiset/modifiers/extract.cc:
Likewise.
* testsuite/23_containers/unordered_multiset/modifiers/merge.cc:
Likewise.
* testsuite/23_containers/unordered_set/modifiers/extract.cc:
Likewise.
* testsuite/23_containers/unordered_set/modifiers/merge.cc:
Likewise.
* testsuite/24_iterators/headers/iterator/range_access_c++17.cc:
Likewise.
* testsuite/24_iterators/headers/iterator/synopsis_c++17.cc:
Likewise.
* testsuite/25_algorithms/clamp/1.cc: Likewise.
* testsuite/25_algorithms/clamp/2.cc: Likewise.
* testsuite/25_algorithms/clamp/constexpr.cc: Likewise.
* testsuite/25_algorithms/clamp/requirements/explicit_instantiation/1.cc:
Likewise.
* testsuite/25_algorithms/clamp/requirements/explicit_instantiation/pod.cc:
Likewise.
* testsuite/26_numerics/headers/cmath/functions_std_c++17.cc:
Likewise.
* testsuite/26_numerics/headers/cmath/special_functions_global.cc:
Likewise.
* testsuite/27_io/basic_ostream/inserters_other/char/lwg2221.cc:
Likewise.
* testsuite/29_atomics/atomic/is_always_lock_free.cc: Likewise.
* testsuite/29_atomics/atomic_integral/is_always_lock_free.cc:
Likewise.
* testsuite/30_threads/shared_lock/70766.cc: Likewise.
* testsuite/30_threads/shared_mutex/cons/1.cc: Likewise.
* testsuite/30_threads/shared_mutex/cons/assign_neg.cc:
Likewise.
* testsuite/30_threads/shared_mutex/cons/copy_neg.cc:
Likewise.
* testsuite/30_threads/shared_mutex/requirements/standard_layout.cc:
Likewise.
* testsuite/30_threads/shared_mutex/try_lock/1.cc: Likewise.
* testsuite/30_threads/shared_mutex/try_lock/2.cc: Likewise.
* testsuite/30_threads/shared_mutex/unlock/1.cc: Likewise.

libstdc++: Remove condition around friend declaration (PR 96382)

libstdc++-v3/ChangeLog:

PR libstdc++/96382
* include/bits/stl_iterator.h (reverse_iterator): Friend
declaration should not depend on __cplusplus.

nvptx: Define TARGET_TRULY_NOOP_TRUNCATION to false

Many thanks to Richard Biener for approving the midde-end
patch that cleared the way for this one.  This nvptx patch
defines the target hook TARGET_TRULY_NOOP_TRUNCATION to
false, indicating that integer truncations require explicit
instructions.  nvptx.c already defines TARGET_MODES_TIEABLE_P
and TARGET_CAN_CHANGE_MODE_CLASS to false, and as (previously)
documented that may require TARGET_TRULY_NOOP_TRUNCATION to
be defined likewise.

This patch decreases the number of unexpected failures in
the testsuite by 10, and increases the number of expected
passes by 4, including these previous FAILs/ICEs:
gcc.c-torture/compile/opout.c
gcc.dg/torture/pr79125.c
gcc.dg/tree-ssa/pr92085-1.c

Unfortunately there is one testsuite failure that used to
pass gcc.target/nvptx/v2si-cvt.c, but this isn't an ICE or
incorrect code.  This regression has been filed as PR96403,
and the failing scan-assembler directives have been replaced
by a reference to the PR.

This patch has been tested on nvptx-none hosted on
x86_64-pc-linux-gnu with "make" and "make check" with
fewer ICEs and no wrong code regressions.

2020-07-31  Roger Sayle  <roger@nextmovesoftware.com>
    Tom de Vries  <tdevries@suse.de>

gcc/ChangeLog:

PR target/90928
* config/nvptx/nvptx.c (nvptx_truly_noop_truncation): Implement.
(TARGET_TRULY_NOOP_TRUNCATION): Define.

gcc/testsuite/ChangeLog:

* gcc.target/nvptx/v2si-cvt.c: Simplify source.  Remove
scan-assembler directives.  Mention PR96403.

libstdc++: Remove accidental -std=gnu++17 from test

This was probably copied from a std::filesystem test and the -std option
wasn't removed.

libstdc++-v3/ChangeLog:

* testsuite/experimental/filesystem/filesystem_error/cons.cc:
Remove -std=gnu++17 option.

libstdc++: Adjust tests that give different results in C++20

libstdc++-v3/ChangeLog:

* testsuite/20_util/is_aggregate/value.cc: Adjust for changes to
definition of aggregates in C++20.
* testsuite/20_util/optional/requirements.cc: Adjust for
defaulted comparisons in C++20.

libstdc++: Add -Wno-deprecated for tests that warn in C++20

libstdc++-v3/ChangeLog:

* testsuite/20_util/tuple/78939.cc: Suppress warnings about
deprecation of volatile-qualified structured bindings in C++20.
* testsuite/20_util/variable_templates_for_traits.cc: Likewise
for deprecation of is_pod in C++20

libstdc++: Remove duplicate dg-do directive

Also add an effective target to clarify it should only run for C++17 and
later.

libstdc++-v3/ChangeLog:

* testsuite/20_util/time_point_cast/rounding.cc: Remove
duplicate dg-do directive and add c++17 effective target.

d: Split up the grouped compilable and runnable tests.

The majority of tests in runnable are really compilable/ICE tests, and
have have dg-do adjusted where necessary.  Tests that had a dependency
on Phobos have also been reproduced and reduced with all imports
stripped from the test.

The end result is a collection of tests that only check the compiler bug
that was being fixed, rather than the library, and a reduction in time
spent running all tests.

gcc/testsuite/ChangeLog:

* gdc.dg/compilable.d: Removed.
* gdc.dg/gdc108.d: New test.
* gdc.dg/gdc115.d: New test.
* gdc.dg/gdc121.d: New test.
* gdc.dg/gdc122.d: New test.
* gdc.dg/gdc127.d: New test.
* gdc.dg/gdc131.d: New test.
* gdc.dg/gdc133.d: New test.
* gdc.dg/gdc141.d: New test.
* gdc.dg/gdc142.d: New test.
* gdc.dg/gdc15.d: New test.
* gdc.dg/gdc17.d: New test.
* gdc.dg/gdc170.d: New test.
* gdc.dg/gdc171.d: New test.
* gdc.dg/gdc179.d: New test.
* gdc.dg/gdc183.d: New test.
* gdc.dg/gdc186.d: New test.
* gdc.dg/gdc187.d: New test.
* gdc.dg/gdc19.d: New test.
* gdc.dg/gdc191.d: New test.
* gdc.dg/gdc194.d: New test.
* gdc.dg/gdc196.d: New test.
* gdc.dg/gdc198.d: New test.
* gdc.dg/gdc200.d: New test.
* gdc.dg/gdc204.d: New test.
* gdc.dg/gdc210.d: New test.
* gdc.dg/gdc212.d: New test.
* gdc.dg/gdc213.d: New test.
* gdc.dg/gdc218.d: New test.
* gdc.dg/gdc223.d: New test.
* gdc.dg/gdc231.d: New test.
* gdc.dg/gdc239.d: New test.
* gdc.dg/gdc24.d: New test.
* gdc.dg/gdc240.d: New test.
* gdc.dg/gdc241.d: New test.
* gdc.dg/gdc242a.d: New test.
* gdc.dg/gdc242b.d: New test.
* gdc.dg/gdc248.d: New test.
* gdc.dg/gdc250.d: New test.
* gdc.dg/gdc251.d: New test.
* gdc.dg/gdc253a.d: New test.
* gdc.dg/gdc253b.d: New test.
* gdc.dg/gdc255.d: New test.
* gdc.dg/gdc256.d: New test.
* gdc.dg/gdc261.d: New test.
* gdc.dg/gdc27.d: New test.
* gdc.dg/gdc273.d: New test.
* gdc.dg/gdc280.d: New test.
* gdc.dg/gdc284.d: New test.
* gdc.dg/gdc285.d: New test.
* gdc.dg/gdc286.d: New test.
* gdc.dg/gdc300.d: New test.
* gdc.dg/gdc309.d: New test.
* gdc.dg/gdc31.d: New test.
* gdc.dg/gdc35.d: New test.
* gdc.dg/gdc36.d: New test.
* gdc.dg/gdc37.d: New test.
* gdc.dg/gdc4.d: New test.
* gdc.dg/gdc43.d: New test.
* gdc.dg/gdc47.d: New test.
* gdc.dg/gdc51.d: New test.
* gdc.dg/gdc57.d: New test.
* gdc.dg/gdc66.d: New test.
* gdc.dg/gdc67.d: New test.
* gdc.dg/gdc71.d: New test.
* gdc.dg/gdc77.d: New test.
* gdc.dg/imports/gdc239.d: Remove phobos dependency.
* gdc.dg/imports/gdc241a.d: Updated imports.
* gdc.dg/imports/gdc241b.d: Likewise.
* gdc.dg/imports/gdc251a.d: Likewise.
* gdc.dg/imports/gdc253.d: Rename to...
* gdc.dg/imports/gdc253a.d: ...this.
* gdc.dg/imports/gdc253b.d: New.
* gdc.dg/imports/gdc36.d: New.
* gdc.dg/imports/runnable.d: Removed.
* gdc.dg/link.d: Removed.
* gdc.dg/runnable.d: Removed.
* gdc.dg/runnable2.d: Removed.
* gdc.dg/simd.d: Remove phobos dependency.

d: Fix regression, all 32-bit execution tests FAIL: internal error printing module cycle

For 32-bit btr(), BIT_NOT_EXPR was being generated twice, something that
was not seen with the 64-bit variant.  Removed the second call to fix
the generated code.

gcc/d/ChangeLog:

PR d/96393
* intrinsics.cc (expand_intrinsic_bt): Don't generate BIT_NOT_EXPR for
btr32 intrinsic.

Set and test no-warning bit to avoid -Wnonnull for synthesized expressions.

Resolves:
PR c++/96003 spurious -Wnonnull calling a member on the result of static_cast

gcc/c-family/ChangeLog:

PR c++/96003
* c-common.c (check_function_arguments_recurse): Return early when
no-warning bit is set.

gcc/cp/ChangeLog:

PR c++/96003
* class.c (build_base_path): Set no-warning bit on the synthesized
conditional expression in static_cast.

gcc/testsuite/ChangeLog:

PR c++/96003
* g++.dg/warn/Wnonnull7.C: New test.

libstdc++: Fix use of newlocale in std:::from_chars

libstdc++-v3/ChangeLog:

* src/c++17/floating_from_chars.cc (from_chars_impl): Use
LC_ALL_MASK not LC_ALL.

debug/96383 - emit debug info for used external functions

This makes sure to emit full declaration DIEs including
formal parameters for used external functions.  This helps
debugging when debug information of the external entity is
not available and also helps external tools cross-checking
ABI compatibility which was the bug reporters use case.

For cc1 this affects debug information size as follows:

     VM SIZE                     FILE SIZE
 ++++++++++++++ GROWING       ++++++++++++++
  [ = ]       0 .debug_info   +1.63Mi  +1.3%
  [ = ]       0 .debug_str     +263Ki  +3.4%
  [ = ]       0 .debug_abbrev  +101Ki  +4.9%
  [ = ]       0 .debug_line   +5.71Ki  +0.0%
   +44%     +16 [Unmapped]        +48  +1.2%

 -------------- SHRINKING     --------------
  [ = ]       0 .debug_loc       -213  -0.0%
  -0.0%     -48 .text             -48  -0.0%
  [ = ]       0 .debug_ranges     -16  -0.0%

  -0.0%     -32 TOTAL         +1.99Mi  +0.6%

and DWARF compression via DWZ can only shave off minor bits
here.

Previously we emitted no DIEs for external functions at all
unless they were referenced via DW_TAG_GNU_call_site which
for some GCC revs caused a regular DIE to appear and since
GCC 4.9 only a stub without formal parameters.  This means
at -O0 we did not emit any DIE for external functions
but with optimization we emitted stubs.

2020-07-30  Richard Biener  <rguenther@suse.de>

PR debug/96383
* langhooks-def.h (lhd_finalize_early_debug): Declare.
(LANG_HOOKS_FINALIZE_EARLY_DEBUG): Define.
(LANG_HOOKS_INITIALIZER): Amend.
* langhooks.c: Include cgraph.h and debug.h.
(lhd_finalize_early_debug): Default implementation from
former code in finalize_compilation_unit.
* langhooks.h (lang_hooks::finalize_early_debug): Add.
* cgraphunit.c (symbol_table::finalize_compilation_unit):
Call the finalize_early_debug langhook.

gcc/c-family/
* c-common.h (c_common_finalize_early_debug): Declare.
* c-common.c: Include debug.h.
(c_common_finalize_early_debug): finalize_early_debug langhook
implementation generating debug for extern declarations.

gcc/c/
* c-objc-common.h (LANG_HOOKS_FINALIZE_EARLY_DEBUG):
Define to c_common_finalize_early_debug.

gcc/cp/
* cp-objcp-common.h (LANG_HOOKS_FINALIZE_EARLY_DEBUG):
Define to c_common_finalize_early_debug.

gcc/testsuite/
* gcc.dg/debug/dwarf2/pr96383-1.c: New testcase.
* gcc.dg/debug/dwarf2/pr96383-2.c: Likewise.

libstdc++-v3/
* testsuite/20_util/assume_aligned/3.cc: Use -g0.

Amend match.pd syntax with force-simplified results

This adds a ! marker to result expressions that should simplify
(and if not fail the simplification).  This can for example be
used like

(simplify
  (plus (vec_cond:s @0 @1 @2) @3)
  (vec_cond @0 (plus! @1 @3) (plus! @2 @3)))

to make the simplification only apply in case both plus operations
in the result end up simplified to a simple operand.

2020-07-31  Richard Biener  <rguenther@suse.de>

* genmatch.c (expr::force_leaf): Add and initialize.
(expr::gen_transform): Honor force_leaf by passing
NULL as sequence argument to maybe_push_res_to_seq.
(parser::parse_expr): Allow ! marker on result expression
operations.
* doc/match-and-simplify.texi: Amend.

vect: Don't consider branch costs if no peeled iterations

Currently vectorizer cost modeling counts branch taken costs for
prologue and epilogue if the number of iterations is unknown.
But it isn't sensible if there are no peeled iterations.

This patch is to guard them under peel_iters_prologue > 0 or
peel_iters_epilogue > 0.

Bootstrapped/regtested on powerpc64le-linux-gnu and aarch64-linux-gnu.

gcc/ChangeLog:

* tree-vect-loop.c (vect_get_known_peeling_cost): Don't consider branch
taken costs for prologue and epilogue if they don't exist.
(vect_estimate_min_profitable_iters): Likewise.

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/sve/cost_model_2.c: Adjust due to cost model
change.

libstdc++: Add PR number to ChangeLog entry

Do not allocate huge array in output_in_order.

We noticed that when analyzing LTRANS memory peak that happens right
after the start:
https://gist.github.com/marxin/223890df4d8d8e490b6b2918b77dacad

In case of chrome, we have symtab->order == 200M, so we allocate
16B * 200M = 3.2GB.

gcc/ChangeLog:

* cgraph.h: Remove leading empty lines.
* cgraphunit.c (enum cgraph_order_sort_kind): Remove
ORDER_UNDEFINED.
(struct cgraph_order_sort): Add constructors.
(cgraph_order_sort::process): New.
(cgraph_order_cmp): New.
(output_in_order): Simplify and push nodes to vector.

middle-end/96369 - fix missed short-circuiting during range folding

This makes the special case of constant evaluated LHS for a
short-circuiting or/and explicit rather than doing range
merging and eventually exposing a side-effect that shouldn't be
evaluated.

2020-07-31  Richard Biener  <rguenther@suse.de>

PR middle-end/96369
* fold-const.c (fold_range_test): Special-case constant
LHS for short-circuiting operations.

* c-c++-common/pr96369.c: New testcase.

libgcov: support overloaded malloc

gcc/ChangeLog:

* gcov-io.h (GCOV_PREALLOCATED_KVP): New.

libgcc/ChangeLog:

* libgcov-driver.c: Add __gcov_kvp_pool
and __gcov_kvp_pool_index variables.
* libgcov.h (allocate_gcov_kvp): New.
(gcov_topn_add_value): Use it.

gcc/testsuite/ChangeLog:

* gcc.dg/tree-prof/indir-call-prof-malloc.c: New test.

AArch64: Add attributes according to flags in built-in functions [PR94442]

2020-07-31  Zhiheng Xie  <xiezhiheng@huawei.com>

gcc/ChangeLog:

* config/aarch64/aarch64-builtins.c (aarch64_general_add_builtin):
Add new argument ATTRS.
(aarch64_call_properties): New function.
(aarch64_modifies_global_state_p): Likewise.
(aarch64_reads_global_state_p): Likewise.
(aarch64_could_trap_p): Likewise.
(aarch64_add_attribute): Likewise.
(aarch64_get_attributes): Likewise.
(aarch64_init_simd_builtins): Add attributes for each built-in function.

Improve var-tracking dataflow iteration order

This builds upon the rev_post_order_and_mark_dfs_back_seme improvements
and makes vt_find_locations iterate over the dataflow problems for
each toplevel SCC separately, improving memory locality and avoiding
to process nodes after the SCC before the SCC itself stabilized.

On the asan_interceptors.cc testcase this for example reduces the
number of visited blocks from 3751 to 2867.  For stage3-gcc
this reduces the number of visited blocks by ~4%.

2020-07-28  Richard Biener  <rguenther@suse.de>

PR debug/78288
* var-tracking.c (vt_find_locations): Use
rev_post_order_and_mark_dfs_back_seme and separately iterate
over toplevel SCCs.

Compute RPO with adjacent SCC members, expose toplevel SCC extents

This produces a more optimal RPO order for iteration processing
by making sure that SCC exits are processed before SCC members
themselves..  This avoids iterating blocks unrelated to the current
iteration for RPO VN and has the chance to improve code-generation
for the non-iterative mode of RPO VN.  The patch also exposes toplevel
SCCs and gets rid of the ad-hoc max_rpo computation in RPO VN.

For simplicity it also removes the odd reverse ordering of the RPO
array returned from rev_post_order_and_mark_dfs_back_seme.

Overall reduction in the number of visited blocks isn't spectacular
for bootstrap (~2.5%) but single cases see up to a 10% reduction.

The same function can be used to optimize var-tracking iteration order
as seen in the followup.

2020-07-28  Richard Biener  <rguenther@suse.de>

* cfganal.h (rev_post_order_and_mark_dfs_back_seme): Adjust
prototype.
* cfganal.c (rpoamdbs_bb_data): New struct with pre BB data.
(tag_header): New helper.
(cmp_edge_dest_pre): Likewise.
(rev_post_order_and_mark_dfs_back_seme): Compute SCCs,
find SCC exits and perform a DFS walk with extra edges to
compute a RPO with adjacent SCC members when requesting an
iteration optimized order and populate the toplevel SCC array.
* tree-ssa-sccvn.c (do_rpo_vn): Remove ad-hoc computation
of max_rpo and fill it in from SCC extent info instead.

* gcc.dg/torture/20200727-0.c: New testcase.

c++: decl_constant_value and unsharing [PR96197]

In the testcase from the PR we're seeing excessive memory use (> 5GB)
during constexpr evaluation, almost all of which is due to the call to
decl_constant_value in the VAR_DECL/CONST_DECL branch of
cxx_eval_constant_expression.  We reach here every time we evaluate an
ARRAY_REF of a constexpr VAR_DECL, and from there decl_constant_value
makes an unshared copy of the VAR_DECL's initializer.  But unsharing
here is unnecessary because callers of cxx_eval_constant_expression
already unshare its result when necessary.

To fix this excessive unsharing, this patch adds a new defaulted
parameter unshare_p to decl_really_constant_value and
decl_constant_value so that callers can control whether to unshare.

As a simplification, we can also move the call to unshare_expr in
constant_value_1 outside of the loop, since doing unshare_expr on a
DECL_P is a no-op.

Now that we no longer unshare the result of decl_constant_value and
decl_really_constant_value from cxx_eval_constant_expression, memory use
during constexpr evaluation for the testcase from the PR falls from ~5GB
to 15MB according to -ftime-report.

gcc/cp/ChangeLog:

PR c++/96197
* constexpr.c (cxx_eval_constant_expression) <case CONST_DECL>:
Pass false to decl_constant_value and decl_really_constant_value
so that they don't unshare their result.
* cp-tree.h (decl_constant_value): New declaration with an added
bool parameter.
(decl_really_constant_value): Add bool parameter defaulting to
true to existing declaration.
* init.c (constant_value_1): Add bool parameter which controls
whether to unshare the initializer before returning.  Call
unshare_expr at most once.
(scalar_constant_value): Pass true to constant_value_1's new
bool parameter.
(decl_really_constant_value): Add bool parameter and forward it
to constant_value_1.
(decl_constant_value): Likewise, but instead define a new
overload with an added bool parameter.

gcc/testsuite/ChangeLog:

PR c++/96197
* g++.dg/cpp1y/constexpr-array8.C: New test.

Daily bump.

d: Fix associative array literals that don't have alignment holes filled

Associative array literal keys with alignment holes are now filled using
memset() prior to usage, with LTR evaluation of side-effects enforced.

gcc/d/ChangeLog:

PR d/96152
* d-codegen.cc (build_array_from_exprs): New function.
* d-tree.h (build_array_from_exprs): Declare.
* expr.cc (ExprVisitor::visit (AssocArrayLiteralExp *)): Use
build_array_from_exprs to generate key and value arrays.

gcc/testsuite/ChangeLog:

PR d/96152
* gdc.dg/pr96152.d: New test.

d: Add -Wvarargs warning flag to the D front-end

The D front-end has C-style variadic functions and va_start/va_arg, so
it is right to also have warnings for inproper use.

gcc/d/ChangeLog:

PR d/96154
* gdc.texi (Warnings): Document -Wvarargs.
* lang.opt: Add -Wvarargs

gcc/testsuite/ChangeLog:

PR d/96154
* gdc.dg/pr96154a.d: New test.
* gdc.dg/pr96154b.d: New test.

d: Fix ICE in expand_intrinsic_vaarg

Both intrinsics did not handle the case where the va_list object comes
from a ref parameter.

gcc/d/ChangeLog:

PR d/96140
* intrinsics.cc (expand_intrinsic_vaarg): Handle ref parameters as
arguments to va_arg().
(expand_intrinsic_vastart): Handle ref parameters as arguments to
va_start().

gcc/testsuite/ChangeLog:

PR d/96140
* gdc.dg/pr96140.d: New test.

libstdc++: Make COW string use allocator_traits for nested types

When compiled as C++20 the COW std::string fails due to assuming that
the allocator always defines size_type and difference_type. That has
been incorrect since C++11, but we got away with it for specializations
using std::allocator until those members were removed in C++20.

libstdc++-v3/ChangeLog:

* include/bits/basic_string.h (size_type, difference_type):
Use allocator_traits to obtain the allocator's size_type and
difference_type.

libstdc++: Check _GLIBCXX_USE_C99_STDLIB for strtof and strtold

On broken systems we only have strtod, not strtof and strtold. Just use
strtod for all types, even though that will produce incorrect results in
some cases.

Similarly, if _GLIBCXX_USE_C99_MATH is not defined then std::isinf won't
be declared. Just refer to it unqualified, which should find the C
library's isinf macro if that hasn't been #undef'd by <cmath>.

libstdc++-v3/ChangeLog:

* src/c++17/floating_from_chars.cc (from_chars_impl): Use
isinf unqualified.
[!_GLIBCXX_USE_C99_STDLIB]: Use strtod for float and long
double.

libstdc++: Fix tests using wrong allocator type

libstdc++-v3/ChangeLog:

* testsuite/23_containers/unordered_multiset/cons/noexcept_default_construct.cc:
Use allocator with the correct value type.
* testsuite/23_containers/unordered_set/cons/noexcept_default_construct.cc:
Likewise.

[PATCH] RS6000 Add testlsbb by Byte operations

Add support for new instructions to test LSB by Byte.

2020-07-29  Will Schmidt  <will_schmidt@vnet.ibm.com>

gcc/ChangeLog:

* config/rs6000/altivec.h (vec_test_lsbb_all_ones): New define.
(vec_test_lsbb_all_zeros): New define.
* config/rs6000/rs6000-builtin.def (BU_P10_VSX_1): New built-in
handling macro.
(XVTLSBB_ZEROS, XVTLSBB_ONES): New builtin defines.
(xvtlsbb_all_zeros, xvtlsbb_all_ones): New builtin overloads.
* config/rs6000/rs6000-call.c (P10_BUILTIN_VEC_XVTLSBB_ZEROS,
P10_BUILTIN_VEC_XVTLSBB_ONES): New altivec_builtin_types entries.
* config/rs6000/rs6000.md (UNSPEC_XVTLSBB):  New unspec.
* config/rs6000/vsx.md (*xvtlsbb_internal): New instruction define.
(xvtlsbbo, xvtlsbbz): New instruction expands.

gcc/testsuite/ChangeLog:

* gcc.target/powerpc/lsbb-runnable.c: New test.
* gcc.target/powerpc/lsbb.c: New test.

RISC-V: Add support for TLS stack protector canary access

gcc/
* config/riscv/riscv-opts.h (stack_protector_guard): New enum.
* config/riscv/riscv.c (riscv_option_override): Handle
the new options.
* config/riscv/riscv.md (stack_protect_set): New pattern to handle
flexible stack protector guard settings.
(stack_protect_set_<mode>): Ditto.
(stack_protect_test): Ditto.
(stack_protect_test_<mode>): Ditto.
* config/riscv/riscv.opt (mstack-protector-guard=,
mstack-protector-guard-reg=, mstack-protector-guard-offset=): New
options.
* doc/invoke.texi (Option Summary) [RISC-V Options]:
Add -mstack-protector-guard=, -mstack-protector-guard-reg=, and
-mstack-protector-guard-offset=.
(RISC-V Options): Ditto.

Signed-off-by: cooper <cooper.qu@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>

d: Inline bounds checking for simple array assignments.

This optimizes the code generation of simple array assignments, inlining
the array bounds checking code so there is no reliance on the library
routine _d_arraycopy(), which also deals with postblit and copy
constructors for non-trivial arrays.

gcc/d/ChangeLog:

* expr.cc (ExprVisitor::visit (AssignExp *)): Inline bounds checking
for simple array assignments.

gcc/testsuite/ChangeLog:

* gdc.dg/array1.d: New test.