[testsuite] Fix guality/pr45882.c for flto

Atm this test in pr45882.c fails:
...
  int d = a[i];  /* { dg-final { gdb-test 16 "d" "112" } } */
...
as follows:
...
FAIL: gcc.dg/guality/pr45882.c   -O2 -flto -fuse-linker-plugin \
      -fno-fat-lto-objects  line 16 d == 112
...

In more detail, gdb fails to print the value of d:
...
Breakpoint 1, foo (i=i@entry=7, j=j@entry=7) at pr45882.c:16
16        ++v;
$1 = <optimized out>
$2 = 112
<optimized out> != 112
...

Variable d is a local variable in function foo, initialized from global array a.
When compiling, first cddce1 removes the initialization of d in foo, given
that d is not used afterwards.  Then ipa marks array a as write-only, and
removes the stores to array a in main.  This invalidates the location
expression for d, which points to a[i], so it is removed, which is why gdb
ends up printing <optimized out> for d.

This patches fixes the fail by adding attribute used to array a, preventing
array a from being marked as write-only.

Tested on x86_64.

2018-06-21  Tom de Vries  <tdevries@suse.de>

* gcc.dg/guality/pr45882.c (a): Add used attribute.

From-SVN: r261845

[tail-merge] Fix side-effect test in stmt_local_def

2018-06-21  Tom de Vries  <tdevries@suse.de>

PR tree-optimization/85859
* tree-ssa-tail-merge.c (stmt_local_def): Copy gimple_is_call
test with comment from bb_no_side_effects_p.

* gcc.dg/pr85859.c: New test.

From-SVN: r261844

re PR tree-optimization/86232 (ICE in record_estimate, at tree-ssa-loop-niter.c:3258)

2018-06-21  Richard Biener  <rguenther@suse.de>

PR tree-optimization/86232
* tree-ssa-loop-niter.c (number_of_iterations_popcount): Adjust
max for constant niter.

* gcc.dg/torture/pr86232.c: New testcase.

From-SVN: r261843

[ARM] Use __ARM_ARCH and __ARM_FEATURE_LDREX instead of __ARM_ARCH__

2018-06-21  Christophe Lyon  <christophe.lyon@linaro.org>

libatomic/
* config/arm/arm-config.h (__ARM_ARCH__): Remove definitions, use
__ARM_ARCH instead. Use __ARM_FEATURE_LDREX to define HAVE_STREX
and HAVE_STREXBHD

libgcc/
* config/arm/lib1funcs.S (__ARM_ARCH__): Remove definitions, use
__ARM_ARCH and __ARM_FEATURE_CLZ instead.
(HAVE_ARM_CLZ): Remove definition, use __ARM_FEATURE_CLZ instead.
* config/arm/ieee754-df.S: Use __ARM_FEATURE_CLZ instead of
__ARM_ARCH__.
* config/arm/ieee754-sf.S: Likewise.
* config/arm/libunwind.S: Use __ARM_ARCH instead of __ARM_ARCH__.

From-SVN: r261841

[ARM] libgcc: Remove unsupported code for __ARM_ARCH__ < 4

2018-06-21  Christophe Lyon  <christophe.lyon@linaro.org>

libgcc/
* config/arm/ieee754-df.S: Remove code for __ARM_ARCH__ < 4, no
longer supported.
* config/arm/ieee754-sf.S: Likewise.

From-SVN: r261840

[AArch64][PATCH 2/2] Combine AES instructions with xor and zero operands

gcc
2018-06-21  Andre Vieira  <andre.simoesdiasvieira@arm.com>

* config/aarch64/aarch64-simd.md
(*aarch64_crypto_aes<aes_op>v16qi_xor_combine): New.

gcc/testsuite
2018-06-21  Andre Vieira  <andre.simoesdiasvieira@arm.com>

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

From-SVN: r261836

[AArch64][PATCH 1/2] Make AES unspecs commutative

gcc
2018-06-21  Andre Vieira  <andre.simoesdiasvieira@arm.com>

* config/aarch64/aarch64-simd.md (aarch64_crypto_aes<aes_op>v16qi):
Make opernads of the unspec commutative.

gcc/testsuite
2018-06-21  Andre Vieira  <andre.simoesdiasvieira@arm.com>

* gcc/gcc.target/aarch64/aes_2.c: New test.

From-SVN: r261835

tree-data-ref.c (dr_step_indicator): Handle NULL DR_STEP.

2018-06-21  Richard Biener  <rguenther@suse.de>

* tree-data-ref.c (dr_step_indicator): Handle NULL DR_STEP.
* tree-vect-data-refs.c (vect_analyze_possibly_independent_ddr):
Avoid calling vect_mark_for_runtime_alias_test with gathers or scatters.
(vect_analyze_data_ref_dependence): Re-order checks to deal with
NULL DR_STEP.
(vect_record_base_alignments): Do not record base alignment
for gathers or scatters.
(vect_compute_data_ref_alignment): Drop return value that is always
true.  Bail out early for gathers or scatters.
(vect_enhance_data_refs_alignment): Bail out early for gathers
or scatters.
(vect_find_same_alignment_drs): Likewise.
(vect_analyze_data_refs_alignment): Remove dead code.
(vect_slp_analyze_and_verify_node_alignment): Likewise.
(vect_analyze_data_refs): For possible gathers or scatters do
not create an alternate DR, just check their possible validity
and mark them.  Adjust DECL_NONALIASED handling to not rely
on DR_BASE_ADDRESS.
* tree-vect-loop-manip.c (vect_update_inits_of_drs): Do not
update inits of gathers or scatters.
* tree-vect-patterns.c (vect_recog_mask_conversion_pattern):
Also copy gather/scatter flag to pattern vinfo.

From-SVN: r261834

re PR other/86198 (Libbacktrace does not properly work with ".note.gnu.build-id" section)

libbacktrace/

2018-06-21 Denis Khalikov <d.khalikov@partner.samsung.com>

PR other/86198
* elf.c (elf_add): Increase ".note.gnu.build-id" section size
checking up to 36 bytes.

From-SVN: r261832

debug.h (_Safe_iterator<>(const _Safe_iterator<_MutableIterator,>& __x)): Compare __x base iterator with a default initialized iterator of the same type.

2018-06-21  François Dumont  <fdumont@gcc.gnu.org>

* include/debug/debug.h
(_Safe_iterator<>(const _Safe_iterator<_MutableIterator,>& __x)):
Compare __x base iterator with a default initialized iterator of the
same type.

From-SVN: r261831

Daily bump.

From-SVN: r261830

re PR libgcc/86213 (-fsplit-stack runtime may clobber SSE input param reg)

libgcc/:
PR libgcc/86213
* generic-morestack.c (allocate_segment): Move calls to getenv and
getpagesize to __morestack_load_mmap.
(__morestack_load_mmap) Initialize static_pagesize and
use_guard_page here so as to avoid clobbering SSE regs during a
__morestack call.
gcc/testsuite/:
* gcc.dg/split-8.c: New.

From-SVN: r261823

rs6000-c.c (altivec_overloaded_builtins): Change behavior of vec_packsu (vector unsigned long long...

gcc/ChangeLog:

2018-06-20  Kelvin Nilsen  <kelvin@gcc.gnu.org>

* config/rs6000/rs6000-c.c (altivec_overloaded_builtins): Change
behavior of vec_packsu (vector unsigned long long, vector unsigned
long long) to match behavior of vec_packs with same signature.

gcc/testsuite/ChangeLog:

2018-06-20  Kelvin Nilsen  <kelvin@gcc.gnu.org>

* gcc.target/powerpc/builtins-1.c: Adjust dg directives to scan
for vpkudus in place of vpksdus.
* gcc.target/powerpc/builtins-3-p8.c: Likewise.

From-SVN: r261819

PR libstdc++/70966 make pmr::new_delete_resource() immortal

Construct the program-wide resource objects using placement new. This
means they have dynamic storage duration and won't be destroyed during
termination.

PR libstdc++/70966
* include/experimental/memory_resource (__resource_adaptor_imp): Add
static assertions to enforce requirements on pointer types.
(__resource_adaptor_imp::get_allocator()): Add noexcept.
(new_delete_resource, null_memory_resource): Return address of an
object with dynamic storage duration.
(__null_memory_resource): Remove.
* testsuite/experimental/memory_resource/70966.cc: New.

From-SVN: r261818

[PR c++/85634] Fix tsubst ICE

https://gcc.gnu.org/ml/gcc-patches/2018-06/msg01274.html
PR c++/85634
* friend.c (add_friend): Keep lookup sets of tempate sets.

PR c++/85634
* g++.dg/lookup/pr85634-2.C: New.

From-SVN: r261817

decl.c (grokfndecl): Add const cp_decl_specifier_seq* parameter...

/cp
2018-06-20  Paolo Carlini  <paolo.carlini@oracle.com>

* decl.c (grokfndecl): Add const cp_decl_specifier_seq* parameter;
tidy handling of a null location_t argument; use proper location
information in a few additional error messages.
(grokdeclarator): Update calls.

/testsuite
2018-06-20  Paolo Carlini  <paolo.carlini@oracle.com>

* g++.dg/template/friend65.C: New.
* g++.dg/cpp0x/main1.C: Likewise.
* g++.dg/other/main2.C: Likewise.
* g++.dg/other/main3.C: Likewise.
* g++.dg/template/friend42.C: Test location too.
* g++.dg/concepts/decl-diagnose.C: Likewise.
* g++.dg/warn/main-2.C: Update.

From-SVN: r261816

Update OpenACC data clause semantics to the 2.5 behavior

gcc/c-family/
* c-pragma.h (enum pragma_omp_clause): Add
PRAGMA_OACC_CLAUSE_{FINALIZE,IF_PRESENT}. Remove
PRAGMA_OACC_CLAUSE_PRESENT_OR_{COPY,COPYIN,COPYOUT,CREATE}.

gcc/c/
* c-parser.c (c_parser_omp_clause_name): Add support for finalize
and if_present. Make present_or_{copy,copyin,copyout,create} aliases
to their non-present_or_* counterparts. Make 'self' an alias to
PRAGMA_OACC_CLAUSE_HOST.
(c_parser_oacc_data_clause): Update GOMP mappings for
PRAGMA_OACC_CLAUSE_{COPY,COPYIN,COPYOUT,CREATE,DELETE}. Remove
PRAGMA_OACC_CLAUSE_{SELF,PRESENT_OR_*}.
(c_parser_oacc_all_clauses): Handle finalize and if_present clauses.
Remove support for present_or_* clauses.
(OACC_KERNELS_CLAUSE_MASK): Remove PRESENT_OR_* clauses.
(OACC_PARALLEL_CLAUSE_MASK): Likewise.
(OACC_DECLARE_CLAUSE_MASK): Likewise.
(OACC_DATA_CLAUSE_MASK): Likewise.
(OACC_ENTER_DATA_CLAUSE_MASK): Remove PRESENT_OR_* clauses.
(OACC_EXIT_DATA_CLAUSE_MASK): Add FINALIZE clause.
(OACC_UPDATE_CLAUSE_MASK): Remove SELF, add IF_PRESENT.
(c_parser_oacc_declare): Remove PRESENT_OR_* clauses.
* c-typeck.c (c_finish_omp_clauses): Handle IF_PRESENT and FINALIZE.

gcc/cp/
* parser.c (cp_parser_omp_clause_name): Add support for finalize
and if_present. Make present_or_{copy,copyin,copyout,create} aliases
to their non-present_or_* counterparts. Make 'self' an alias to
PRAGMA_OACC_CLAUSE_HOST.
(cp_parser_oacc_data_clause): Update GOMP mappings for
PRAGMA_OACC_CLAUSE_{COPY,COPYIN,COPYOUT,CREATE,DELETE}. Remove
PRAGMA_OACC_CLAUSE_{SELF,PRESENT_OR_*}.
(cp_parser_oacc_all_clauses): Handle finalize and if_present clauses.
Remove support for present_or_* clauses.
(OACC_KERNELS_CLAUSE_MASK): Remove PRESENT_OR_* clauses.
(OACC_PARALLEL_CLAUSE_MASK): Likewise.
(OACC_DECLARE_CLAUSE_MASK): Likewise.
(OACC_DATA_CLAUSE_MASK): Likewise.
(OACC_ENTER_DATA_CLAUSE_MASK): Remove PRESENT_OR_* clauses.
(OACC_EXIT_DATA_CLAUSE_MASK): Add FINALIZE clause.
(OACC_UPDATE_CLAUSE_MASK): Remove SELF, add IF_PRESENT.
(cp_parser_oacc_declare): Remove PRESENT_OR_* clauses.
* pt.c (tsubst_omp_clauses): Handle IF_PRESENT and FINALIZE.
* semantics.c (finish_omp_clauses): Handle IF_PRESENT and FINALIZE.

gcc/fortran/
* gfortran.h (gfc_omp_clauses): Add unsigned if_present, finalize
bitfields.
* openmp.c (enum omp_mask2): Remove OMP_CLAUSE_PRESENT_OR_*. Add
OMP_CLAUSE_{IF_PRESENT,FINALIZE}.
(gfc_match_omp_clauses): Update handling of copy, copyin, copyout,
create, deviceptr, present_of_*. Add support for finalize and
if_present.
(OACC_PARALLEL_CLAUSES): Remove PRESENT_OR_* clauses.
(OACC_KERNELS_CLAUSES): Likewise.
(OACC_DATA_CLAUSES): Likewise.
(OACC_DECLARE_CLAUSES): Likewise.
(OACC_UPDATE_CLAUSES): Add IF_PRESENT clause.
(OACC_ENTER_DATA_CLAUSES): Remove PRESENT_OR_* clauses.
(OACC_EXIT_DATA_CLAUSES): Add FINALIZE clause.
(gfc_match_oacc_declare): Update to OpenACC 2.5 semantics.
* trans-openmp.c (gfc_trans_omp_clauses): Add support for IF_PRESENT
and FINALIZE.

gcc/
* gimplify.c (gimplify_scan_omp_clauses): Add support for
OMP_CLAUSE_{IF_PRESENT,FINALIZE}.
(gimplify_adjust_omp_clauses): Likewise.
(gimplify_oacc_declare_1): Add support for GOMP_MAP_RELEASE, remove
support for GOMP_MAP_FORCE_{ALLOC,TO,FROM,TOFROM}.
(gimplify_omp_target_update): Update handling of acc update and
enter/exit data.
* omp-low.c (install_var_field): Remove unused parameter
base_pointers_restrict.
(scan_sharing_clauses): Remove base_pointers_restrict parameter.
Update call to install_var_field. Handle OMP_CLAUSE_{IF_PRESENT,
FINALIZE}
(omp_target_base_pointers_restrict_p): Delete.
(scan_omp_target): Update call to scan_sharing_clauses.
* tree-core.h (enum omp_clause_code): Add OMP_CLAUSE_{IF_PRESENT,
FINALIZE}.
* tree-nested.c (convert_nonlocal_omp_clauses): Handle
OMP_CLAUSE_{IF_PRESENT,FINALIZE}.
(convert_local_omp_clauses): Likewise.
* tree-pretty-print.c (dump_omp_clause): Likewise.
* tree.c (omp_clause_num_ops): Add entries for  OMP_CLAUSE_{IF_PRESENT,
FINALIZE}.
(omp_clause_code_name): Likewise.

gcc/testsuite/
* c-c++-common/goacc/declare-1.c: Update test case to utilize OpenACC
2.5 data clause semantics.
* c-c++-common/goacc/declare-2.c: Likewise.
* c-c++-common/goacc/default-4.c: Likewise.
* c-c++-common/goacc/finalize-1.c: New test.
* c-c++-common/goacc/kernels-alias-2.c: Update test case to utilize
OpenACC 2.5 data clause semantics.
* c-c++-common/goacc/kernels-alias.c: Likewise.
* c-c++-common/goacc/routine-5.c: Likewise.
* c-c++-common/goacc/update-if_present-1.c: New test.
* c-c++-common/goacc/update-if_present-2.c: New test.
* g++.dg/goacc/template.C: Update test case to utilize OpenACC
2.5 data clause semantics.
* gfortran.dg/goacc/combined-directives.f90: Likewise.
* gfortran.dg/goacc/data-tree.f95: Likewise.
* gfortran.dg/goacc/declare-2.f95: Likewise.
* gfortran.dg/goacc/default-4.f: Likewise.
* gfortran.dg/goacc/enter-exit-data.f95: Likewise.
* gfortran.dg/goacc/finalize-1.f: New test.
* gfortran.dg/goacc/kernels-alias-2.f95: Update test case to utilize
OpenACC 2.5 data clause semantics.
* gfortran.dg/goacc/kernels-alias.f95: Likewise.
* gfortran.dg/goacc/kernels-tree.f95: Likewise.
* gfortran.dg/goacc/nested-function-1.f90: Likewise.
* gfortran.dg/goacc/parallel-tree.f95: Likewise.
* gfortran.dg/goacc/reduction-promotions.f90: Likewise.
* gfortran.dg/goacc/update-if_present-1.f90: New test.
* gfortran.dg/goacc/update-if_present-2.f90: New test.

libgomp/
* libgomp.h (struct splay_tree_key_s): Add dynamic_refcount member.
(gomp_acc_remove_pointer): Update declaration.
(gomp_acc_declare_allocate): Declare.
(gomp_remove_var): Declare.
* libgomp.map (OACC_2.5): Define.
* oacc-mem.c (acc_map_data): Update refcount.
(acc_unmap_data): Likewise.
(present_create_copy): Likewise.
(acc_create): Add FLAG_PRESENT when calling present_create_copy.
(acc_copyin): Likewise.
(FLAG_FINALIZE): Define.
(delete_copyout): Update dynamic refcounts, add support for FINALIZE.
(acc_delete_finalize): New function.
(acc_delete_finalize_async): New function.
(acc_copyout_finalize): New function.
(acc_copyout_finalize_async): New function.
(gomp_acc_insert_pointer): Update refcounts.
(gomp_acc_remove_pointer): Return if data is not present on the
accelerator.
* oacc-parallel.c (find_pset): Rename to find_pointer.
(find_pointer): Add support for GOMP_MAP_POINTER.
(handle_ftn_pointers): New function.
(GOACC_parallel_keyed): Update refcounts of variables.
(GOACC_enter_exit_data): Add support for finalized data mappings.
Add support for GOMP_MAP_{TO,ALLOC,RELESE,FROM}. Update handling
of fortran arrays.
(GOACC_update): Add support for GOMP_MAP_{ALWAYS_POINTER,TO,FROM}.
(GOACC_declare): Add support for GOMP_MAP_RELEASE, remove support
for GOMP_MAP_FORCE_FROM.
* openacc.f90 (module openacc_internal): Add
acc_copyout_finalize_{32_h,64_h,array_h,_l}, and
acc_delete_finalize_{32_h,64_h,array_h,_l}. Add interfaces for
acc_copyout_finalize and acc_delete_finalize.
(acc_copyout_finalize_32_h): New subroutine.
(acc_copyout_finalize_64_h): New subroutine.
(acc_copyout_finalize_array_h): New subroutine.
(acc_delete_finalize_32_h): New subroutine.
(acc_delete_finalize_64_h): New subroutine.
(acc_delete_finalize_array_h): New subroutine.
* openacc.h (acc_copyout_finalize): Declare.
(acc_copyout_finalize_async): Declare.
(acc_delete_finalize): Declare.
(acc_delete_finalize_async): Declare.
* openacc_lib.h (acc_copyout_finalize): New interface.
(acc_delete_finalize): New interface.
* target.c (gomp_map_vars): Update dynamic_refcount.
(gomp_remove_var): New function.
(gomp_unmap_vars): Use it.
(gomp_unload_image_from_device): Likewise.
* testsuite/libgomp.oacc-c-c++-common/data-already-1.c: Update test
case to utilize OpenACC 2.5 data clause semantics.
* testsuite/libgomp.oacc-c-c++-common/data-already-2.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/data-already-3.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/data-already-4.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/data-already-5.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/data-already-6.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/data-already-7.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/data-already-8.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/lib-16.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/lib-25.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/lib-32.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/lib-83.c: Likewise.
* testsuite/libgomp.oacc-fortran/data-5.f90: New test.
* testsuite/libgomp.oacc-fortran/data-already-1.f: Update test case to
utilize OpenACC 2.5 data clause semantics.
* testsuite/libgomp.oacc-fortran/data-already-2.f: Likewise.
* testsuite/libgomp.oacc-fortran/data-already-3.f: Likewise.
* testsuite/libgomp.oacc-fortran/data-already-4.f: Likewise.
* testsuite/libgomp.oacc-fortran/data-already-5.f: Likewise.
* testsuite/libgomp.oacc-fortran/data-already-6.f: Likewise.
* testsuite/libgomp.oacc-fortran/data-already-7.f: Likewise.
* testsuite/libgomp.oacc-fortran/data-already-8.f: Likewise.
* testsuite/libgomp.oacc-fortran/lib-32-1.f: Likewise.
* testsuite/libgomp.oacc-fortran/lib-32-2.f: Likewise.

Co-Authored-By: Cesar Philippidis <cesar@codesourcery.com>
Co-Authored-By: Thomas Schwinge <thomas@codesourcery.com>
From-SVN: r261813

re PR c++/86210 (Missing -Wnonnull warning for function defined in the same TU)

PR c++/86210
* c-common.c (check_nonnull_arg): Use fold_for_warn.  Adjust obsolete
comment.

* g++.dg/warn/Wnonnull4.C: New test.

From-SVN: r261811

Add testcase accidentally not committed earlier

* testsuite/20_util/duration/arithmetic/dr3050.cc: Add new test
missed from recent commit.

From-SVN: r261810

re PR c++/86240 (ice: unexpected expression absu_expr)

PR c++/86240
* constexpr.c (cxx_eval_constant_expression): Handle ABSU_EXPR.
(fold_simple_1): Likewise.
* error.c (dump_expr): Likewise.

* g++.dg/pr86240.C: New test.

From-SVN: r261809

re PR debug/86194 (ICE: SIGSEGV in avoid_constant_pool_reference (simplify-rtx.c:215) with -O -g -mavx512bw)

PR debug/86194
* var-tracking.c (use_narrower_mode_test): Check if shift amount can
be narrowed.

* gcc.target/i386/pr86194.c: New test.

From-SVN: r261807

re PR tree-optimization/86231 (vrp_meet causes wrong-code)

PR tree-optimization/86231
* tree-vrp.c (union_ranges): For (  [  )  ] or (   )[   ] range and
anti-range don't overwrite *vr0min before using it to compute *vr0max.

* gcc.dg/tree-ssa/vrp119.c: New test.
* gcc.c-torture/execute/pr86231.c: New test.

From-SVN: r261805

Generate correctly typed compare in canonicalize_loop_ivs

2018-06-20  Tom de Vries  <tdevries@suse.de>

PR tree-optimization/86097
* tree-ssa-loop-manip.c (canonicalize_loop_ivs): Also convert *nit to
iv type if signedness of iv type is not the same as that of *nit.

* gcc.dg/autopar/pr86097.c: New test.

From-SVN: r261804

cfgrtl.c (rtl_verify_edges): Formatting fix.

* cfgrtl.c (rtl_verify_edges): Formatting fix.  If bb->preds has any
EDGE_EH edges, verify they are all EDGE_EH.

From-SVN: r261803

[PR c++/85634] Fix tsubst ICE

https://gcc.gnu.org/ml/gcc-patches/2018-06/msg01237.html
PR c++/85634
* cp-tree.h (lookup_keep): Drop KEEP parm.
(lookup_list_keep): Delete.
(maybe_get_fns): Declare.
* parser.c (cp_parser_primary_expression): Call lookup_keep here.
(cp_parser_template_id): Not here ...
* decl.c (cp_finish_decl): ... nor here ...
* init.c (build_raw_new_expr): ... nor here ...
* pt.c (process_template_parm): ... nor here ...
* semantics.c (perform_koenig_lookup): Call lookup_keep.
(finish_call_expr): Not here.
* tree.c (ovl_cache): Delete.
(ovl_make, ovl_copy): No cache.
(lookup_keep): Always keep.
(lookup_list_keep): Delete.
(maybe_get_fns): New, broken out of ...
(get_fns): ... here.  Call it.
(built_min_nt_loc, build_min, build_min_non_dep): Drop lookup_keep.
(build_min_nt_call_vec): Likewise.

PR c++/85634
* g++.dg/lookup/pr85634.C: New.

From-SVN: r261802

Remove not longer valid FIXME comment.

2018-06-20  Martin Liska  <mliska@suse.cz>

* lto-symtab.c (lto_symtab_merge_p): Remove not valid
        FIXME comment.

From-SVN: r261798

* ginclude/stddef.h: Limit #include <machine/ansi.h> to NetBSD.

From-SVN: r261797

[AArch64] Support for LDP/STP of Q-registers

This patch adds support for generating LDPs and STPs of Q-registers.
This allows for more compact code generation and makes better use of the ISA.

It's implemented in a straightforward way by allowing 16-byte modes in the
sched-fusion machinery and adding appropriate peepholes in aarch64-ldpstp.md
as well as the patterns themselves in aarch64-simd.md.

It adds a new no_ldp_stp_qregs tuning flag.
I use it to restrict the peepholes in aarch64-ldpstp.md from merging the
operations together into PARALLELs. I also use it to restrict the sched fusion
check that brings such loads and stores together. This is enough to avoid
forming the pairs when the tuning flag is set.

I didn't see any non-noise performance effect on SPEC2017 on Cortex-A72 and Cortex-A53.

        * config/aarch64/aarch64-tuning-flags.def (no_ldp_stp_qregs): New.
        * config/aarch64/aarch64.c (xgene1_tunings): Add
        AARCH64_EXTRA_TUNE_NO_LDP_STP_QREGS to tune_flags.
        (aarch64_mode_valid_for_sched_fusion_p):
        Allow 16-byte modes.
        (aarch64_classify_address): Allow 16-byte modes for load_store_pair_p.
        * config/aarch64/aarch64-ldpstp.md: Add peepholes for LDP STP of
        128-bit modes.
        * config/aarch64/aarch64-simd.md (load_pair<VQ:mode><VQ2:mode>):
        New pattern.
        (vec_store_pair<VQ:mode><VQ2:mode>): Likewise.
        * config/aarch64/iterators.md (VQ2): New mode iterator.

        * gcc.target/aarch64/ldp_stp_q.c: New test.
        * gcc.target/aarch64/stp_vec_128_1.c: Likewise.
        * gcc.target/aarch64/ldp_stp_q_disable.c: Likewise.

From-SVN: r261796

Change default for jump_table expansion ratio to 8.

2018-06-20  Martin Liska  <mliska@suse.cz>

* tree-switch-conversion.c (jump_table_cluster::can_be_handled):
        Change default ratio from 10 to 8.

From-SVN: r261795

Enable clustering for switch statements.

2018-06-20  Martin Liska  <mliska@suse.cz>

* tree-switch-conversion.c (jump_table_cluster::find_jump_tables):
        New.
(bit_test_cluster::find_bit_tests): Likewise.
(switch_decision_tree::analyze_switch_statement): Find clusters.
* tree-switch-conversion.h (struct jump_table_cluster): Document
        hierarchy.

From-SVN: r261794

Switch other switch expansion methods into classes.

2018-06-20  Martin Liska  <mliska@suse.cz>

* tree-switch-conversion.c (switch_conversion::collect):
        Record m_uniq property.
(switch_conversion::expand): Bail out for special conditions.
(group_cluster::~group_cluster): New.
(group_cluster::group_cluster): Likewise.
(group_cluster::dump): Likewise.
(jump_table_cluster::emit): New.
(switch_decision_tree::fix_phi_operands_for_edges): New.
(struct case_node): Remove struct.
(jump_table_cluster::can_be_handled): New.
(case_values_threshold): Moved to header.
(reset_out_edges_aux): Likewise.
(jump_table_cluster::is_beneficial): New.
(bit_test_cluster::can_be_handled): Likewise.
(add_case_node): Remove.
(bit_test_cluster::is_beneficial): New.
(case_bit_test::cmp): New.
(bit_test_cluster::emit): New.
(expand_switch_as_decision_tree_p): Remove.
(bit_test_cluster::hoist_edge_and_branch_if_true): New.
(fix_phi_operands_for_edge): Likewise.
(switch_decision_tree::analyze_switch_statement): New.
(compute_cases_per_edge): Move ...
(switch_decision_tree::compute_cases_per_edge): ... here.
(try_switch_expansion): Likewise.
(switch_decision_tree::try_switch_expansion): Likewise.
(record_phi_operand_mapping): Likewise.
(switch_decision_tree::record_phi_operand_mapping): Likewise.
(emit_case_decision_tree): Likewise.
(switch_decision_tree::emit): Likewise.
(balance_case_nodes): Likewise.
(switch_decision_tree::balance_case_nodes): Likewise.
(dump_case_nodes): Likewise.
(switch_decision_tree::dump_case_nodes): Likewise.
(emit_jump): Likewise.
(switch_decision_tree::emit_jump): Likewise.
(emit_cmp_and_jump_insns): Likewise.
(switch_decision_tree::emit_cmp_and_jump_insns): Likewise.
(emit_case_nodes): Likewise.
(switch_decision_tree::emit_case_nodes): Likewise.
(conditional_probability): Remove.
* tree-switch-conversion.h (enum cluster_type): New.
(PRINT_CASE): New.
(struct cluster): Likewise.
(cluster::cluster): Likewise.
(struct simple_cluster): Likewise.
(simple_cluster::simple_cluster): Likewise.
(struct group_cluster): Likewise.
(struct jump_table_cluster): Likewise.
(struct bit_test_cluster): Likewise.
(struct min_cluster_item): Likewise.
(struct case_tree_node): Likewise.
(case_tree_node::case_tree_node): Likewise.
(jump_table_cluster::case_values_threshold): Likewise.
(struct case_bit_test): Likewise.
(struct switch_decision_tree): Likewise.
(struct switch_conversion): Likewise.
(switch_decision_tree::reset_out_edges_aux): Likewise.
2018-06-20  Martin Liska  <mliska@suse.cz>

* gcc.dg/tree-ssa/vrp104.c: Grep just for GIMPLE IL.

From-SVN: r261793

Transform switch_conversion into a class.

2018-06-20  Martin Liska  <mliska@suse.cz>

* tree-switch-conversion.c (MAX_CASE_BIT_TESTS): Remove.
(hoist_edge_and_branch_if_true): Likewise.
(expand_switch_using_bit_tests_p): Likewise.
(struct case_bit_test): Likewise.
(case_bit_test_cmp): Likewise.
(emit_case_bit_tests): Likewise.
(switch_conversion::switch_conversion): New class.
(struct switch_conv_info): Remove old struct.
(collect_switch_conv_info): More to ...
(switch_conversion::collect): ... this.
(check_range): Likewise.
(switch_conversion::check_range): Likewise.
(check_all_empty_except_final): Likewise.
(switch_conversion::check_all_empty_except_final): Likewise.
(check_final_bb): Likewise.
(switch_conversion::check_final_bb): Likewise.
(create_temp_arrays): Likewise.
(switch_conversion::create_temp_arrays): Likewise.
(free_temp_arrays): Likewise.
(gather_default_values): Likewise.
(switch_conversion::gather_default_values): Likewise.
(build_constructors): Likewise.
(switch_conversion::build_constructors): Likewise.
(constructor_contains_same_values_p): Likewise.
(switch_conversion::contains_same_values_p): Likewise.
(array_value_type): Likewise.
(switch_conversion::array_value_type): Likewise.
(build_one_array): Likewise.
(switch_conversion::build_one_array): Likewise.
(build_arrays): Likewise.
(switch_conversion::build_arrays): Likewise.
(gen_def_assigns): Likewise.
(switch_conversion::gen_def_assigns): Likewise.
(prune_bbs): Likewise.
(switch_conversion::prune_bbs): Likewise.
(fix_phi_nodes): Likewise.
(switch_conversion::fix_phi_nodes): Likewise.
(gen_inbound_check): Likewise.
(switch_conversion::gen_inbound_check): Likewise.
(process_switch): Use the newly created class.
(switch_conversion::expand): New.
(switch_conversion::~switch_conversion): New.
* tree-switch-conversion.h: New file.

From-SVN: r261792

[8/n] PR85694: Make patterns check for target support

This patch makes pattern recognisers do their own checking for vector
types and target support.  Previously some recognisers did this
themselves and some left it to vect_pattern_recog_1.

Doing this means we can get rid of the type_in argument, which was
ignored if the recogniser did its own checking.  It also means
we create fewer junk statements.

2018-06-20  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-vectorizer.h (NUM_PATTERNS, vect_recog_func_ptr): Move to
tree-vect-patterns.c.
* tree-vect-patterns.c (vect_supportable_direct_optab_p): New function.
(vect_recog_dot_prod_pattern): Use it.  Remove the type_in argument.
(vect_recog_sad_pattern): Likewise.
(vect_recog_widen_sum_pattern): Likewise.
(vect_recog_pow_pattern): Likewise.  Check for a null vectype.
(vect_recog_widen_shift_pattern): Remove the type_in argument.
(vect_recog_rotate_pattern): Likewise.
(vect_recog_mult_pattern): Likewise.
(vect_recog_vector_vector_shift_pattern): Likewise.
(vect_recog_divmod_pattern): Likewise.
(vect_recog_mixed_size_cond_pattern): Likewise.
(vect_recog_bool_pattern): Likewise.
(vect_recog_mask_conversion_pattern): Likewise.
(vect_try_gather_scatter_pattern): Likewise.
(vect_recog_widen_mult_pattern): Likewise.  Check for a null vectype.
(vect_recog_over_widening_pattern): Likewise.
(vect_recog_gather_scatter_pattern): Likewise.
(vect_recog_func_ptr): Move from tree-vectorizer.h
(vect_vect_recog_func_ptrs): Move further down the file.
(vect_recog_func): Likewise.  Remove the third argument.
(NUM_PATTERNS): Define based on vect_vect_recog_func_ptrs.
(vect_pattern_recog_1): Expect the pattern function to do any
necessary target tests.  Also expect it to provide a vector type.
Remove the type_in handling.

From-SVN: r261791

[7/n] PR85694: Add a vect_pattern_detected helper

This message is a long write-up for a patch that simply adds a common
routine for printing the "vector_foo_pattern: detected:" messages.

The reason for doing this is that some routines check for target support
themselves and some leave it to vect_pattern_recog_1.  Those that leave
it to vect_pattern_recog_1 currently print these "detected:" messages if
the statements have the right form, even if the pattern is eventually
discarded.  IMO that's useful, and a lot of existing scan tests rely on it.

However, a later patch makes patterns do their own testing, and stops
them creating pattern statements until the tests have passed.  This means
(a) they need to print the "detected:" message earlier and (b) the pattern
statement won't be around to print.

The patch therefore makes all routines print the original statement
rather than the pattern one.  That information isn't obvious otherwise,
whereas vect_pattern_recog_1 already prints the pattern statement
in the case of a successful match.  This also avoids the previous
situation in which a routine could print "detected:" and then
silently bail out before saying what had been detected.

2018-06-20  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-vect-patterns.c (vect_pattern_detected): New function.
(vect_recog_dot_prod_patternm, vect_recog_sad_pattern)
(vect_recog_widen_mult_pattern, vect_recog_widen_sum_pattern)
(vect_recog_over_widening_pattern, vect_recog_widen_shift_pattern
(vect_recog_rotate_pattern, vect_recog_vector_vector_shift_pattern)
(vect_recog_mult_pattern, vect_recog_divmod_pattern)
(vect_recog_mixed_size_cond_pattern, vect_recog_bool_pattern)
(vect_recog_mask_conversion_pattern)
(vect_try_gather_scatter_pattern): Likewise.

From-SVN: r261790

[6/n] PR85694: Add a vect_get_internal_def helper

This patch adds a helper for pattern code that wants to find an
internal (vectorisable) definition of an SSA name.

A later patch will make more use of this, and alter the definition.

2018-06-20  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-vect-patterns.c (vect_get_internal_def): New function.
(vect_recog_dot_prod_pattern, vect_recog_sad_pattern)
(vect_recog_vector_vector_shift_pattern, check_bool_pattern)
(search_type_for_mask_1): Use it.

From-SVN: r261789

[5/n] PR85694: Remove dead WIDEN_SUM handling

vect_recog_dot_prod_pattern and vect_recog_sad_pattern both checked
whether the statement passed in had already been recognised as a
WIDEN_SUM_EXPR pattern.  That isn't possible (any more?), since the
first recognised pattern wins, and since vect_recog_widen_sum_pattern
never matches a later statement than the one it's given.

2018-06-20  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-vect-patterns.c (vect_recog_dot_prod_pattern): Remove
redundant WIDEN_SUM_EXPR handling.
(vect_recog_sad_pattern): Likewise.

From-SVN: r261788

[4/n] PR85694: Remove redundant calls to types_compatible_p

tree-vect-patterns.c checked that operands to primitive arithmetic ops
are compatible with each other and with the result.  The checks date
back years and have long been redundant with verify_gimple_stmt.

2018-06-20  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-vect-patterns.c (vect_recog_dot_prod_pattern): Remove
redundant check that the types of a PLUS_EXPR or MULT_EXPR agree.
(vect_recog_sad_pattern): Likewise PLUS_EXPR, ABS_EXPR and MINUS_EXPR.
(vect_recog_widen_mult_pattern): Likewise MULT_EXPR.
(vect_recog_widen_sum_pattern): Likewise PLUS_EXPR.

From-SVN: r261787

[3/n] PR85694: Fix dummy assignment handling in vectorizable_call

vectorizable_call stubs out the original scalar statement with
a dummy assignment to the same lhs, so that we don't leave any bogus
scalar calls around.  If the call is actually a pattern statement,
the code rightly took the lhs of the original bb statement:

  if (is_pattern_stmt_p (stmt_info))
    lhs = gimple_call_lhs (STMT_VINFO_RELATED_STMT (stmt_info));
  else
    lhs = gimple_call_lhs (stmt);

But it then associated the new statement with the stmt_vec_info of the
pattern statement rather than the bb statement, which meant we had two
stmt_vec_infos assigning to the same lhs.  This seems to be latent at
the moment but caused problems further into the series.

2018-06-20  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-vect-stmts.c (vectorizable_call): Make sure that we
use the stmt_vec_info of the original bb statement for the
new zero assignment, even if the call is part of a pattern.

From-SVN: r261786

[2/n] PR85694: Attach a DEF_SEQ only to the original statement

A pattern's PATTERN_DEF_SEQ was attached to both the original statement
and the main pattern statement, which made it harder to update later.
This patch attaches it to just the original statement.  In practice,
anything that cared had ready access to both.

2018-06-20  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-vectorizer.h (_stmt_vec_info): Note above pattern_def_seq
that the sequence is attached to the original statement rather
than the pattern statement.
* tree-vect-loop.c (vect_determine_vf_for_stmt): Take the
PATTERN_DEF_SEQ from the original statement rather than
the main pattern statement.
* tree-vect-stmts.c (free_stmt_vec_info): Likewise.
* tree-vect-patterns.c (vect_recog_dot_prod_pattern): Likewise.
(vect_mark_pattern_stmts): Don't copy the PATTERN_DEF_SEQ.

From-SVN: r261785

[1/n] PR85694: Allow pattern definition statements to be reused

This patch is the first part of a series to fix to PR85694.
Later patches can make the pattern for a statement S2 reuse the
results of a PATTERN_DEF_SEQ statement attached to an earlier
statement S1.  Although vect_mark_stmts_to_be_vectorized handled
this fine, vect_analyze_stmt and vect_transform_loop both skipped the
PATTERN_DEF_SEQ for S1 if S1's main pattern wasn't live or relevant.

I couldn't wrap my head around the flow in vect_transform_loop,
so ended up moving the per-statement handling into a subroutine.
That makes the patch look bigger than it actually is.

2018-06-20  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
* tree-vect-stmts.c (vect_analyze_stmt): Move the handling of pattern
definition statements before the early exit for statements that aren't
live or relevant.
* tree-vect-loop.c (vect_transform_loop_stmt): New function,
split out from...
(vect_transform_loop): ...here.  Process pattern definition
statements without first checking whether the main pattern
statement is live or relevant.

From-SVN: r261784

Daily bump.

From-SVN: r261779

Wrap is_static with COLLECT_EXPORT_LIST

From-SVN: r261775

PR middle-end/85602 - -Warray-bounds fails to detect the out of bound array access

gcc/testsuite/ChangeLog:
  * c-c++-common/attr-nonstring-8.c: Adjust text of expected warning
  to also match C++.

From-SVN: r261774

tree-cfgcleanup.c (tree_forwarder_block_p): Do not return false at -O0 if the locus represent UNKNOWN_LOCATION but have...

* tree-cfgcleanup.c (tree_forwarder_block_p): Do not return false at
-O0 if the locus represent UNKNOWN_LOCATION but have different values.

From-SVN: r261770

rs6000-string.c (select_block_compare_mode): Check TARGET_EFFICIENT_OVERLAPPING_UNALIGNED here instead of in caller.

2018-06-19  Aaron Sawdey  <acsawdey@linux.ibm.com>

* config/rs6000/rs6000-string.c (select_block_compare_mode): Check
TARGET_EFFICIENT_OVERLAPPING_UNALIGNED here instead of in caller.
(do_and3, do_and3_mask, do_compb3, do_rotl3): New functions.
(expand_block_compare): Change select_block_compare_mode call.
(expand_strncmp_align_check): Use new functions, fix comment.
(emit_final_str_compare_gpr): New function.
(expand_strn_compare): Refactor and clean up code.
* config/rs6000/vsx.md (vsx_mov<mode>_64bit): Remove *.

From-SVN: r261769

collect2.c (static_obj): New variable.

2018-06-19  Tony Reix  <tony.reix@atos.com>
            Damien Bergamini  <damien.bergamini@atos.com>
            David Edelsohn  <dje.gcc@gmail.com>

        * collect2.c (static_obj): New variable.
        (static_libs): New variable.
        (is_in_list): Uncomment declaration.
        (main): Track AIX libraries linked statically.
        (is_in_list): Uncomment definition.
        (scan_prog_file): Don't add AIX shared libraries initializer
        to constructor list if linking statically.

Co-Authored-By: Damien Bergamini <damien.bergamini@atos.com>
Co-Authored-By: David Edelsohn <dje.gcc@gmail.com>
From-SVN: r261759

cp-tree.h (CONSTRUCTOR_NO_IMPLICIT_ZERO): Remove.

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

* constexpr.c: Use CONSTRUCTOR_NO_CLEARING instead.

From-SVN: r261758

PR c++/86192 - ICE with anonymous union passed to template.

* pt.c (tsubst_expr) [DECL_EXPR]: Handle an anonymous union type
used to declare a named variable.

From-SVN: r261757

xtensa: fix PR target/65416

The issue is caused by reordering of stack pointer update after stack
space allocation with instructions that write to the allocated stack
space. In windowed ABI register spill area for the previous call frame
is located just below the stack pointer and may be reloaded back into
the register file on movsp.
Implement allocate_stack pattern for windowed ABI configuration and
insert an instruction that prevents reordering of frame memory access
and stack pointer update.

gcc/
2018-06-19  Max Filippov  <jcmvbkbc@gmail.com>

* config/xtensa/xtensa.md (UNSPEC_FRAME_BLOCKAGE): New unspec
constant.
(allocate_stack, frame_blockage, *frame_blockage): New patterns.

From-SVN: r261755

re PR middle-end/85602 (-Wsizeof-pointer-memaccess for strncat with size of source)

gcc/testsuite/ChangeLog:

PR middle-end/85602
* c-c++-common/attr-nonstring-8.c: Adjust text of expected warning
to also match C++.

From-SVN: r261751

Remove unused <exception> header from <utility>

This header was needed for the declaration of std::terminate but the
calls to it were removed in r242401.

* include/std/utility: Remove unused <exception> header.

From-SVN: r261749

tree.c (find_decls_types_r): Remove all non-VAR_DECLs from blocks.

* tree.c (find_decls_types_r): Remove all non-VAR_DECLs from
blocks.
* g++.dg/lto/pr84805_0.C: Update template.
* g++.dg/lto/pr84805_1.C: Update template.

From-SVN: r261748

* es.po: Update.

From-SVN: r261745

Clean-up usage of ipa_fn_summary and ipa_call_summary summaries.

2018-06-19  Martin Liska  <mliska@suse.cz>

* config/i386/i386.c (ix86_can_inline_p): Do not use
        ipa_fn_summaries::get_create.
* ipa-cp.c (ipcp_cloning_candidate_p): Replace get_create with
        get.
(devirtualization_time_bonus): Likewise.
(ipcp_propagate_stage): Likewise.
* ipa-fnsummary.c (redirect_to_unreachable): Likewise.
(edge_set_predicate): Likewise.
(evaluate_conditions_for_known_args): Likewise.
(evaluate_properties_for_edge): Likewise.
(ipa_call_summary::reset): Tranform to ...
(ipa_call_summary::~ipa_call_summary): ... this.
(ipa_fn_summary::reset): Transform to ...
(ipa_fn_summary::~ipa_fn_summary): ... this.
(ipa_fn_summary_t::remove): Rename to ...
(ipa_fn_summary_t::remove_callees): ... this.
(ipa_fn_summary_t::duplicate): Use placement new
        instead of memory copy.
(ipa_call_summary_t::duplicate): Likewise.
(ipa_call_summary_t::remove): Remove.
(dump_ipa_call_summary): Change get_create to get.
(ipa_dump_fn_summary): Dump only when summary exists.
(analyze_function_body): Use symbol_summary::get instead
        of get_create.
(compute_fn_summary): Likewise.
(estimate_edge_devirt_benefit): Likewise.
(estimate_edge_size_and_time): Likewise.
(inline_update_callee_summaries): Likewise.
(remap_edge_change_prob): Likewise.
(remap_edge_summaries): Likewise.
(ipa_merge_fn_summary_after_inlining): Likewise.
(write_ipa_call_summary): Likewise.
(ipa_fn_summary_write): Likewise.
(ipa_free_fn_summary): Likewise.
* ipa-fnsummary.h (struct GTY): Add new ctor and copy ctor.
(struct ipa_call_summary): Likewise.
* ipa-icf.c (sem_function::merge): Use symbol_summary::get instead
        of get_create.
* ipa-inline-analysis.c (do_estimate_edge_time): Likewise.
(estimate_size_after_inlining): Likewise.
(estimate_growth): Likewise.
(growth_likely_positive): Likewise.
* ipa-inline-transform.c (clone_inlined_nodes): Likewise.
(inline_call): Likewise.
* ipa-inline.c (caller_growth_limits): Likewise.
(can_inline_edge_p): Likewise.
(can_inline_edge_by_limits_p): Likewise.
(compute_uninlined_call_time): Likewise.
(compute_inlined_call_time): Likewise.
(want_inline_small_function_p): Likewise.
(edge_badness): Likewise.
(update_caller_keys): Likewise.
(update_callee_keys): Likewise.
(inline_small_functions): Likewise.
(inline_to_all_callers_1): Likewise.
(dump_overall_stats): Likewise.
(early_inline_small_functions): Likewise.
(early_inliner): Likewise.
* ipa-profile.c (ipa_propagate_frequency_1): Likewise.
* ipa-prop.c (ipa_make_edge_direct_to_target): Likewise.
* ipa-pure-const.c (malloc_candidate_p): Likewise.
* ipa-split.c (execute_split_functions): Likewise.
* symbol-summary.h: Likewise.
* tree-sra.c (ipa_sra_preliminary_function_checks): Likewise.
2018-06-19  Martin Liska  <mliska@suse.cz>

* lto-partition.c (add_symbol_to_partition_1): Use symbol_summary::get instead
        of get_create.
(undo_partition): Likewise.
(lto_balanced_map): Likewise.

From-SVN: r261744

Improve gimple.vim syntax file.

From-SVN: r261742

Add initial version of rtl.vim syntax file.

2018-06-19  Martin Liska  <mliska@suse.cz>

* gcc-rtl.vim: New file.

From-SVN: r261741

tree-vectorizer.c (try_vectorize_loop_1): Split out of ...

2018-06-19  Richard Biener  <rguenther@suse.de>

* tree-vectorizer.c (try_vectorize_loop_1): Split out of ...
(vectorize_loops): ... here.  Fix dbgcnt handling.
(try_vectorize_loop): Wrap try_vectorize_loop_1.

From-SVN: r261740

Allow building of the zlib component when the building takes place in the source directory.

* zlib/configure.ac: Restore old behaviour of only enabling
multilibs when a target subdirectory is defined.  This allows
building with srcdir == builddir.
* zlib/configure: Regenerate.

From-SVN: r261739

rs6000: Fix vector homogeneous aggregates (PR86197)

The existing code allows only 4 vectors worth of ieee128 homogeneous
aggregates, but it should be 8.  This happens because at one spot it
is mistakenly qualified as being passed in floating point registers.

PR target/86197
* config/rs6000/rs6000.md (rs6000_discover_homogeneous_aggregate): An
ieee128 argument takes up only one (vector) register, not two (floating
point) registers.

From-SVN: r261738

gimplify.c (gimplify_init_constructor): Really never clear for an incomplete constructor if CONSTRUCTOR_NO_CLEARING is set.

* gimplify.c (gimplify_init_constructor): Really never clear for an
incomplete constructor if CONSTRUCTOR_NO_CLEARING is set.

From-SVN: r261735

Remove unused stagestuff in config-lang.in.

2018-06-19  Martin Liska  <mliska@suse.cz>

* config-lang.in: Remove stagestuff.

From-SVN: r261733

re PR tree-optimization/86179 (ice in get_later_stmt, at tree-vectorizer.h:1108)

2018-06-19  Richard Biener  <rguenther@suse.de>

PR tree-optimization/86179
* tree-vect-patterns.c (vect_pattern_recog_1): Clean up
after failed recognition.

* gcc.dg/pr86179.c: New testcase.

From-SVN: r261731

tree.c (cp_expr_location): New.

* tree.c (cp_expr_location): New.

* cp-tree.h (cp_expr_loc_or_loc): New.
* call.c, cvt.c, constexpr.c, constraint.cc, cp-gimplify.c, decl.c,
error.c, init.c, lex.c, parser.c, pt.c, semantics.c, typeck.c,
typeck2.c: Use it instead of EXPR_LOC_OR_LOC.

From-SVN: r261728

Use a range for LAMBDA_EXPR_LOCATION.

* parser.c (cp_parser_lambda_expression): Use a range for
LAMBDA_EXPR_LOCATION.

From-SVN: r261727

PR c++/86200 - ICE with unexpanded pack in lambda parameter.

* pt.c (find_parameter_packs_r) [LAMBDA_EXPR]: Also look into the
function type.

From-SVN: r261726

PR c++/81060 - ICE with unexpanded parameter pack.

* pt.c (check_for_bare_parameter_packs): Add loc parameter.
* decl.c (grokdeclarator): Call it for qualifying_scope.

From-SVN: r261725

Daily bump.

From-SVN: r261724

PR middle-end/85602 - -Wsizeof-pointer-memaccess for strncat with size of source

gcc/c-family/ChangeLog:

PR middle-end/85602
* c-warn.c (sizeof_pointer_memaccess_warning): Check for attribute
nonstring.

gcc/ChangeLog:

PR middle-end/85602
* calls.c (maybe_warn_nonstring_arg): Handle strncat.
* tree-ssa-strlen.c (is_strlen_related_p): Make extern.
Handle integer subtraction.
(maybe_diag_stxncpy_trunc): Handle nonstring source arguments.
* tree-ssa-strlen.h (is_strlen_related_p): Declare.

gcc/testsuite/ChangeLog:

PR middle-end/85602
* gcc.dg/attr-nonstring-2.c: Adjust text of expected warning.
* c-c++-common/attr-nonstring-8.c: New test.

From-SVN: r261718

Makefile.def (fortran): Add check-target-libgomp-fortran.

* Makefile.def (fortran): Add check-target-libgomp-fortran.
* Makefile.tpl (check-target-libgomp-fortran): New phony target.
* Makefile.in: Regenerate.

From-SVN: r261717

LWG 2975 ensure construct(pair<T,U>*, ...) used to construct pairs

* include/std/scoped_allocator (__not_pair): Define SFINAE helper.
(construct(_Tp*, _Args&&...)): Remove from overload set when _Tp is
a specialization of std::pair.
* testsuite/20_util/scoped_allocator/construct_pair.cc: Ensure
pair elements are constructed correctly.

From-SVN: r261716

More rtx to rtx_insn * cleanups

gcc/ChangeLog:
* config/frv/frv-protos.h (frv_ifcvt_modify_insn): Strengthen 3rd
param from rtx to rtx_insn *.
* config/frv/frv.c (frv_ifcvt_add_insn): Likewise for "insn"
param.
(frv_ifcvt_modify_insn): Likwise.
(frv_ifcvt_modify_final): Likwise for local "existing_insn",
adding an as_a <rtx_insn *> cast.  Likewise for local "insn".
* config/mips/mips.c (r10k_insert_cache_barriers): Add an
as_a <rtx_insn *> cast to local "unprotected_region" once
it's been established that it's not NULL or pc_rtx.
* config/nds32/nds32-relax-opt.c (nds32_group_insns): Strengthen
param "sethi" from rtx to rtx_insn *.
(nds32_group_float_insns): Likewise for param "insn".
* config/vax/vax-protos.h (vax_output_int_add): Likewise for 1st
param.
(vax_output_int_subtract): Likewise.
* config/vax/vax.c (vax_output_int_add): Likewise for param
"insn".
(vax_output_int_subtract): Likewise.
* emit-rtl.c (set_insn_deleted): Likewise, removing cast.
(emit_pattern_after): Likewise for param "after".
(emit_insn_after): Likewise.
(emit_jump_insn_after): Likewise.
(emit_call_insn_after): Likewise.
(emit_debug_insn_after): Likewise.
(emit_pattern_before): Likewise for param "before".
(emit_insn_before): Likewise.
(emit_jump_insn_before): Likewise.
* final.c (get_insn_template): Likewise for param "insn", removing
a cast.
* output.h (get_insn_template): Likewise for 2nd param.
* rtl.h (emit_insn_before): Likewise.
(emit_jump_insn_before): Likewise.
(emit_debug_insn_before_noloc): Likewise.
(emit_insn_after): Likewise.
(emit_jump_insn_after): Likewise.
(emit_call_insn_after): Likewise.
(emit_debug_insn_after): Likewise.
(set_insn_deleted): Likewise for param.

From-SVN: r261715

re PR target/85358 (PowerPC: Using -mabi=ieeelongdouble -mcpu=power9 breaks __ibm128)

[gcc]
2018-06-18  Michael Meissner  <meissner@linux.ibm.com>

PR target/85358
* config/rs6000/rs6000-modes.def (toplevel): Rework the 128-bit
floating point modes, so that IFmode is numerically greater than
TFmode, which is greater than KFmode using FRACTIONAL_FLOAT_MODE
to declare the ordering.  This prevents IFmode from being
converted to TFmode when long double is IEEE 128-bit on an ISA 3.0
machine.  Include rs6000-modes.h to share the fractional values
between genmodes* and the rest of the compiler.
(IFmode): Likewise.
(KFmode): Likewise.
(TFmode): Likewise.
* config/rs6000/rs6000-modes.h: New file.
* config/rs6000/rs6000.c (rs6000_debug_reg_global): Change the
meaning of rs6000_long_double_size so that 126..128 selects an
appropriate 128-bit floating point type.
(rs6000_option_override_internal): Likewise.
* config/rs6000/rs6000.h (toplevel): Include rs6000-modes.h.
(TARGET_LONG_DOUBLE_128): Change the meaning of
rs6000_long_double_size so that 126..128 selects an appropriate
128-bit floating point type.
(LONG_DOUBLE_TYPE_SIZE): Update comment.
* config/rs6000/rs6000.md (trunciftf2): Correct the modes of the
source and destination to match the standard usage.
(truncifkf2): Likewise.
(copysign<mode>3, IEEE iterator): Rework copysign of float128 on
ISA 2.07 to use an explicit clobber, instead of passing in a
temporary.
(copysign<mode>3_soft): Likewise.

[libgcc]
2018-06-18  Michael Meissner  <meissner@linux.ibm.com>

* config/rs6000/t-float128 (FP128_CFLAGS_SW): Compile float128
support modules with -mno-gnu-attribute.
* config/rs6000/t-float128-hw (FP128_CFLAGS_HW): Likewise.

From-SVN: r261712

LWG 2989 hide path iostream operators from normal lookup

By only defining these operators as friends (with no namespace-scope
declaration) they can only be found by ADL and do not participate in
overload resolution for arguments of types other than path.

LWG 2989 hide path iostream operators from normal lookup
* include/bits/fs_path.h (operator<<, operator>>): Define inline as
friends.
* testsuite/27_io/filesystem/path/io/dr2989.cc: New.

From-SVN: r261711

Introduce DUMP_VECT_SCOPE macro

gcc/ChangeLog:
* tree-vect-data-refs.c (vect_analyze_data_ref_dependences):
Replace dump_printf_loc call with DUMP_VECT_SCOPE.
(vect_slp_analyze_instance_dependence): Likewise.
(vect_enhance_data_refs_alignment): Likewise.
(vect_analyze_data_refs_alignment): Likewise.
(vect_slp_analyze_and_verify_instance_alignment
(vect_analyze_data_ref_accesses): Likewise.
(vect_prune_runtime_alias_test_list): Likewise.
(vect_analyze_data_refs): Likewise.
* tree-vect-loop-manip.c (vect_update_inits_of_drs): Likewise.
* tree-vect-loop.c (vect_determine_vectorization_factor): Likewise.
(vect_analyze_scalar_cycles_1): Likewise.
(vect_get_loop_niters): Likewise.
(vect_analyze_loop_form_1): Likewise.
(vect_update_vf_for_slp): Likewise.
(vect_analyze_loop_operations): Likewise.
(vect_analyze_loop): Likewise.
(vectorizable_induction): Likewise.
(vect_transform_loop): Likewise.
* tree-vect-patterns.c (vect_pattern_recog): Likewise.
* tree-vect-slp.c (vect_analyze_slp): Likewise.
(vect_make_slp_decision): Likewise.
(vect_detect_hybrid_slp): Likewise.
(vect_slp_analyze_operations): Likewise.
(vect_slp_bb): Likewise.
* tree-vect-stmts.c (vect_mark_stmts_to_be_vectorized): Likewise.
(vectorizable_bswap): Likewise.
(vectorizable_call): Likewise.
(vectorizable_simd_clone_call): Likewise.
(vectorizable_conversion): Likewise.
(vectorizable_assignment): Likewise.
(vectorizable_shift): Likewise.
(vectorizable_operation): Likewise.
* tree-vectorizer.h (DUMP_VECT_SCOPE): New macro.

From-SVN: r261710

PR c++/86171 - ICE with recursive alias instantiation.

* pt.c (tsubst_decl): Handle recursive alias instantiation.

From-SVN: r261709

LWG 3050 Fix cv-qualification of convertibility constraints

LWG 3050 Fix cv-qualification of convertibility constraints
* include/std/chrono (duration, operator*, operator/, operator%): Use
const-qualified type as source type in is_convertible constraints.
* testsuite/20_util/duration/arithmetic/dr3050.cc: New.
* testsuite/20_util/duration/cons/dr3050.cc: New.
* testsuite/20_util/duration/literals/range.cc: Rename to...
* testsuite/20_util/duration/literals/range_neg.cc: Here. Adjust
dg-error lineno.

From-SVN: r261708

crossconfig.m4: Handle OpenBSD just like NetBSD.

2018-06-18  Maya Rashish  <coypu@sdf.org>

* crossconfig.m4: Handle OpenBSD just like NetBSD.
* configure: Rebuilt.

* config/alpha/openbsd.h (TARGET_DEFAULT): Define.
(LINK_SPEC, STARTFILE_SPEC, ENDFILE_SPEC): Likewise.
(INTMAX_TYPE, UINTMAX_TYPE, WINT_TYPE): Likewise.

* config/alpha/elf.h (STARTFILE_SPEC, ENDFILE_SPEC): Move from
here to ...
* config/alpha/linux.h (STARTFILE_SPEC, ENDFILE_SPEC): Here.

From-SVN: r261707

P0754R2 <version> header

* include/Makefile.am: Add new header.
* include/Makefile.in: Regenerate.
* include/bits/c++config: Change doxygen comment to suggest <version>
instead of <iosfwd>.
* include/precompiled/stdc++.h: Include <cwchar> and <cwctype>
unconditionally.  Add C++17 and C++20 headers.
* include/std/version: New header.
* testsuite/17_intro/headers/c++2017/all_attributes.cc: New.
* testsuite/17_intro/headers/c++2017/all_no_exceptions.cc: New.
* testsuite/17_intro/headers/c++2017/all_no_rtti.cc: New.
* testsuite/17_intro/headers/c++2017/all_pedantic_errors.cc: New.
* testsuite/17_intro/headers/c++2017/operator_names.cc: New.
* testsuite/17_intro/headers/c++2017/stdc++.cc: New.
* testsuite/17_intro/headers/c++2017/stdc++_multiple_inclusion.cc:
New.
* testsuite/17_intro/headers/c++2020/all_attributes.cc: New.
* testsuite/17_intro/headers/c++2020/all_no_exceptions.cc: New.
* testsuite/17_intro/headers/c++2020/all_no_rtti.cc: New.
* testsuite/17_intro/headers/c++2020/all_pedantic_errors.cc: New.
* testsuite/17_intro/headers/c++2020/operator_names.cc: New.
* testsuite/17_intro/headers/c++2020/stdc++.cc: New.
* testsuite/17_intro/headers/c++2020/stdc++_multiple_inclusion.cc:
New.
* testsuite/18_support/headers/version/macros.cc: New.
* testsuite/18_support/headers/version/macros.cc: New.

From-SVN: r261706

PR tree-optimization/81384 - built-in form of strnlen missing

gcc/ChangeLog:

PR tree-optimization/81384
* builtin-types.def (BT_FN_SIZE_CONST_STRING_SIZE): New.
* builtins.c (expand_builtin_strnlen): New function.
(expand_builtin): Call it.
(fold_builtin_n): Avoid setting TREE_NO_WARNING.
* builtins.def (BUILT_IN_STRNLEN): New.
* calls.c (maybe_warn_nonstring_arg): Handle BUILT_IN_STRNLEN.
Warn for bounds in excess of maximum object size.
* tree-ssa-strlen.c (maybe_set_strlen_range): Return tree representing
single-value ranges.  Handle strnlen.
(handle_builtin_strlen): Handle strnlen.
(strlen_check_and_optimize_stmt): Same.
* doc/extend.texi (Other Builtins): Document strnlen.

gcc/testsuite/ChangeLog:

PR tree-optimization/81384
* gcc.c-torture/execute/builtins/lib/strnlen.c: New test.
* gcc.c-torture/execute/builtins/strnlen-lib.c: New test.
* gcc.c-torture/execute/builtins/strnlen.c: New test.
* gcc.dg/attr-nonstring-2.c: New test.
* gcc.dg/attr-nonstring-3.c: New test.
* gcc.dg/attr-nonstring-4.c: New test.
* gcc.dg/strlenopt-45.c: New test.
* gcc.dg/strlenopt.h (strnlen):  Declare.

From-SVN: r261705

Fix bootstrap failure for bare metal due to autoconf link tests

The AC_CHECK_FUNCS tests cause the build to fail for bare metal cross
compilers, where link tests are not allowed. Replace them with
GCC_TRY_COMPILE_OR_LINK tests instead. Skip all the Filesystem
dependency checks if not building the filesystem library.

* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Only check when
enable_libstdcxx_filesystem_ts = yes. Check for link, readlink and
symlink.
* config.h.in: Regenerate.
* configure: Regenerate.
* configure.ac: Remove AC_CHECK_FUNCS for link, readlink and symlink.

From-SVN: r261704

LWG 3035. std::allocator's constructors should be constexpr

LWG 3035. std::allocator's constructors should be constexpr
* include/bits/allocator.h (allocator): Add constexpr to constructors
for C++2a. Replace dynamic exception specifications with NOTHROW
macro.
(allocator, operator==, operator!=): Replace USE_NOEXCEPT macro with
NOTHROW.
* include/bits/c++config (_GLIBCXX20_CONSTEXPR): Define.
* include/ext/malloc_allocator.h (malloc_allocator): Add constexpr
to constructors for C++2a.
* include/ext/new_allocator.h (new_allocator): Likewise.

From-SVN: r261703

decl.c (duplicate_decls): Consistently use DECL_SOURCE_LOCATION in errors about redefined default...

2018-06-18  Paolo Carlini  <paolo.carlini@oracle.com>

* decl.c (duplicate_decls): Consistently use DECL_SOURCE_LOCATION
in errors about redefined default arguments; tidy.

From-SVN: r261702

tree.c (escaped_string::escape): Replace cast to char * by const_cast<char *> (unescaped).

2018-06-18  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

* tree.c (escaped_string::escape): Replace cast to char * by
const_cast<char *> (unescaped).

From-SVN: r261700

[testsuite] Add target pthread to pr86076.c

Add missing target pthread to ensure test doesn't fail on bare-metal
targets. Committed as obvious.

    testsuite/
PR tree-optimization/86076
* gcc.dg/pr86076.c: Add target pthread for bare-metal targets.

From-SVN: r261699

[testsuite] Remove xfail from vect-abs-compile.c

Since PR64946 has been fixed, we can remove the xfail from this test.
Committed as obvious.

    testsuite/
PR tree-optimization/64946
* gcc.target/aarch64/vect-abs-compile.c: Remove xfail.

From-SVN: r261698

Ensure that control characters in user supplied error and warning messages are escaped.

PR 84195
* tree.c (escaped_string): New class.  Converts an unescaped
string into its escaped equivalent.
(warn_deprecated_use): Use the new class to convert the
deprecation message, if present.
(test_escaped_strings): New self test.
(test_c_tests): Add test_escaped_strings.

From-SVN: r261697

tree.c (decl_value_expr_lookup): Revert latest change.

* tree.c (decl_value_expr_lookup): Revert latest change.
(decl_value_expr_insert): Likewise.
fortran/
* trans-decl.c (gfc_get_fake_result_decl): Revert latest change.

From-SVN: r261696

Daily bump.

From-SVN: r261695

Remove superfluous prefix

From-SVN: r261688

gimplify.c (nonlocal_vlas): Delete.

* gimplify.c (nonlocal_vlas): Delete.
(nonlocal_vla_vars): Likewise.
(gimplify_var_or_parm_decl): Do not add debug VAR_DECLs for non-local
referenced VLAs.
(gimplify_body): Do not create and destroy nonlocal_vlas.
* tree-nested.c: Include diagnostic.h.
(use_pointer_in_frame): Tweak.
(lookup_field_for_decl): Add assertion and declare the transformation.
(convert_nonlocal_reference_op) <PARM_DECL>: Rework and issue an
internal error when the reference is in a wrong context.  Do not
create a debug decl by default.
(note_nonlocal_block_vlas): Delete.
(convert_nonlocal_reference_stmt) <GIMPLE_BIND>: Do not call it.
(convert_local_reference_op) <PARM_DECL>: Skip the frame decl.  Do not
create a debug decl by default.
(convert_gimple_call) <GIMPLE_CALL>: Issue an internal error when the
call is in a wrong context.
(fixup_vla_decls): New function.
(finalize_nesting_tree_1): Adjust comment.  Call fixup_vla_decls if no
debug variables were created.
* tree.c (decl_value_expr_lookup): Add checking assertion.
(decl_value_expr_insert): Likewise.
fortran/
* fortran/trans-decl.c (nonlocal_dummy_decl_pset): Delete.
(nonlocal_dummy_decls): Likewise.
(gfc_nonlocal_dummy_array_decl): Likewise.
(gfc_get_symbol_decl): Do not call gfc_nonlocal_dummy_array_decl.
(gfc_get_fake_result_decl): Do not generate a new DECL if simply
reusing the result of a recursive call.
(gfc_generate_function_code): Do not create, insert and destroy
nonlocal_dummy_decls.

From-SVN: r261687

Daily bump.

From-SVN: r261686

re PR middle-end/82479 (missing popcount builtin detection)

gcc/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

PR middle-end/82479
* ipa-fnsummary.c (will_be_nonconstant_expr_predicate): Handle CALL_EXPR.
* tree-scalar-evolution.c (interpret_expr): Likewise.
(expression_expensive_p): Likewise.
* tree-ssa-loop-ivopts.c (contains_abnormal_ssa_name_p): Likewise.
* tree-ssa-loop-niter.c (number_of_iterations_popcount): New.
(number_of_iterations_exit_assumptions): Use number_of_iterations_popcount.
(ssa_defined_by_minus_one_stmt_p): New.

gcc/testsuite/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

PR middle-end/82479
* gcc.dg/tree-ssa/popcount.c: New test.
* gcc.dg/tree-ssa/popcount2.c: New test.

From-SVN: r261682

re PR tree-optimization/64946 ([AArch64] gcc.target/aarch64/vect-abs-compile.c - "abs" vectorization fails for char/short types)

gcc/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

PR middle-end/64946
* cfgexpand.c (expand_debug_expr): Hande ABSU_EXPR.
* config/i386/i386.c (ix86_add_stmt_cost): Likewise.
* dojump.c (do_jump): Likewise.
* expr.c (expand_expr_real_2): Check operand type's sign.
* fold-const.c (const_unop): Handle ABSU_EXPR.
(fold_abs_const): Likewise.
* gimple-pretty-print.c (dump_unary_rhs): Likewise.
* gimple-ssa-backprop.c (backprop::process_assign_use): Likesie.
(strip_sign_op_1): Likesise.
* match.pd: Add new pattern to generate ABSU_EXPR.
* optabs-tree.c (optab_for_tree_code): Handle ABSU_EXPR.
* tree-cfg.c (verify_gimple_assign_unary): Likewise.
* tree-eh.c (operation_could_trap_helper_p): Likewise.
* tree-inline.c (estimate_operator_cost): Likewise.
* tree-pretty-print.c (dump_generic_node): Likewise.
* tree-vect-patterns.c (vect_recog_sad_pattern): Likewise.
* tree.def (ABSU_EXPR): New.

gcc/c-family/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

* c-common.c (c_common_truthvalue_conversion): Handle ABSU_EXPR.

gcc/c/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

* c-typeck.c (build_unary_op): Handle ABSU_EXPR;
* gimple-parser.c (c_parser_gimple_statement): Likewise.
(c_parser_gimple_unary_expression): Likewise.

gcc/cp/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

* constexpr.c (potential_constant_expression_1): Handle ABSU_EXPR.
* cp-gimplify.c (cp_fold): Likewise.

gcc/testsuite/ChangeLog:

2018-06-16  Kugan Vivekanandarajah  <kuganv@linaro.org>

PR middle-end/64946
* gcc.dg/absu.c: New test.
* gcc.dg/gimplefe-29.c: New test.
* gcc.target/aarch64/pr64946.c: New test.

From-SVN: r261681

re PR middle-end/86095 (documentation for -Wunsafe-loop-optimizations references options which have no effect any more)

PR middle-end/86095
* common.opt (Wunsafe-loop-optimizations): Add Ignore, remove Var,
documented as preserved for backward compatibility only.
* doc/invoke.texi: Remove -Wunsafe-loop-optimizations documentation.

From-SVN: r261679

re PR rtl-optimization/86108 (crash during unwinding with -O2)

PR rtl-optimization/86108
* bb-reorder.c (create_forwarder_block): Renamed to ...
(create_eh_forwarder_block): ... this.  Split OLD_BB after labels and
jump from new landing pad to the second part.
(sjlj_fix_up_crossing_landing_pad, dw2_fix_up_crossing_landing_pad):
Adjust callers.

From-SVN: r261678

PR c++/86147 - wrong capture for template argument.

* expr.c (mark_use): Look through NOP_EXPR.

From-SVN: r261676

config.guess: Import latest version.

* config.guess: Import latest version.
* config.sub: Likewise.

From-SVN: r261675

Daily bump.

From-SVN: r261674

LWG 3076 basic_string CTAD ambiguity

When deduction guides are supported by the compiler (i.e. for C++17 and
later) replace two basic_string constructors by constrained function
templates as required by LWG 3075. In order to ensure that the pre-C++17
non-template constructors are still exported from the shared library
define a macro in src/c++11/string-inst.cc to force the non-template
declarations (this isn't strictly needed yet, because the string
instantiations are compiled with -std=gnu++11, but that is likely to
change).

LWG 3076 basic_string CTAD ambiguity
* doc/xml/manual/intro.xml: Document LWG 3076 change.
* include/bits/basic_string.h
[__cpp_deduction_guides && !_GLIBCXX_DEFINING_STRING_INSTANTIATIONS]
(basic_string(const _CharT*, const _Alloc&)): Turn into a function
template constrained by _RequireAllocator.
(basic_string(size_type, _CharT, const _Alloc&)): Likewise.
* src/c++11/string-inst.cc (_GLIBCXX_DEFINING_STRING_INSTANTIATIONS):
Define.
* testsuite/21_strings/basic_string/cons/char/deduction.cc: Test
deduction
* testsuite/21_strings/basic_string/cons/wchar_t/deduction.cc:
Likewise.

From-SVN: r261670

re PR c/86093 (volatile ignored on pointer in C)

PR c/86093
* c-typeck.c (pointer_diff): Cast both pointers to unqualified types
before doing POINTER_DIFF_EXPR.

* c-c++-common/pr86093.c: New test.

From-SVN: r261663