Daily bump.

From-SVN: r259307

re PR c++/70808 (Spurious -Wzero-as-null-pointer-constant for nullptr_t)

/cp
2018-04-10  Paolo Carlini  <paolo.carlini@oracle.com>

PR c++/70808
* init.c (build_zero_init_1): Handle NULLPTR_TYPE_P being true of
the type like TYPE_PTR_OR_PTRMEM_P.

/testsuite
2018-04-10  Paolo Carlini  <paolo.carlini@oracle.com>

PR c++/70808
* g++.dg/warn/Wzero-as-null-pointer-constant-7.C: New.

From-SVN: r259303

re PR target/85321 (Missing documentation and option misc for ppc64le)

2018-04-10  Aaron Sawdey  <acsawdey@linux.ibm.com>

PR target/85321
* doc/invoke.texi (RS/6000 and PowerPC Options): Document options
-mblock-compare-inline-limit, -mblock-compare-inline-loop-limit,
and -mstring-compare-inline-limit.

From-SVN: r259302

MAINTAINERS: Update my email address.

2018-04-10  Aaron Sawdey  <acsawdey@linux.ibm.com>

* MAINTAINERS: Update my email address.

From-SVN: r259301

forgot the PR marker in the changelog

From-SVN: r259300

rs6000: Fix stack clash for big residuals (PR85287)

The stack clash protection code had a logic error in how it decided
whether to put the final update size in a register, or to emit it
directly in an insn.  This fixes it.  It also tidies some surrounding
code.

PR target/85287
* gcc/config/rs6000/rs6000.md (allocate_stack): Put the residual size
for stack clash protection in a register whenever we need it to be in
a register.

From-SVN: r259299

rs6000: Enable -fasynchronous-unwind-tables by default

To find out where on-entry register values live at any point in a
program, GDB currently tries to parse to parse the executable code.
This does not work very well, for example it gets confused if some
accesses to the stack use the frame pointer (r31) and some use the
stack pointer (r1).  A symptom is that backtraces can be cut short.

This patch enables -fasynchronous-unwind-tables by default for rs6000,
which causes us to emit DWARF unwind tables for all functions, solving
these problems.

This not do anything for sub-targets without DWARF, and only for ELF
sub-targets for now.

It increases executable size, but only modestly, and does not change
memory use, only the disk image.

* common/config/rs6000/rs6000-common.c (rs6000_option_init_struct):
Enable -fasynchronous-unwind-tables by default if OBJECT_FORMAT_ELF.

gcc/testsuite/
* gcc.target/powerpc/dfmode_off.c: Add -fno-asynchronous-unwind-tables.
* gcc.target/powerpc/dimode_off.c: Ditto.
* gcc.target/powerpc/tfmode_off.c: Ditto.
* gcc.target/powerpc/timode_off.c: Ditto.

From-SVN: r259298

rs6000: Improve --help=target (PR85321)

This updates the help text for some options to mention the allowed
values for -mXX=XX.

PR target/85321
* config/rs6000/rs6000.opt (mtraceback=): Show the allowed values in
the help text.
(mlong-double-): Ditto.
* config/rs6000/sysv4.opt (msdata=): Ditto.
(mtls-size=): Ditto.

From-SVN: r259296

rs6000-c.c (altivec_overloaded_builtins): Remove erroneous entries for "vector int vec_ldl (int...

gcc/ChangeLog:

2018-04-10  Kelvin Nilsen  <kelvin@gcc.gnu.org>

* config/rs6000/rs6000-c.c (altivec_overloaded_builtins): Remove
erroneous entries for
"vector int vec_ldl (int, long int *)", and
"vector unsigned int vec_ldl (int, unsigned long int *)".
Add comments and entries for
"vector bool char vec_ldl (int, bool char *)",
"vector bool short vec_ldl (int, bool short *)",
"vector bool int vec_ldl (int, bool int *)",
"vector bool long long vec_ldl (int, bool long long *)",
"vector pixel vec_ldl (int, pixel *)",
"vector long long vec_ldl (int, long long *)",
"vector unsigned long long vec_ldl (int, unsigned long long *)".
* config/rs6000/rs6000.c (rs6000_init_builtins): Initialize new
type tree bool_long_long_type_node and correct definition of
bool_V2DI_type_node to make reference to this new type tree.
(rs6000_mangle_type): Replace erroneous reference to
bool_long_type_node with bool_long_long_type_node.
* config/rs6000/rs6000.h (enum rs6000_builtin_type_index): Add
comments to emphasize sign distinctions for char and int types and
replace RS6000_BTI_bool_long constant with
RS6000_BTI_bool_long_long constant.  Also add comment to restrict
use of RS6000_BTI_pixel.
(bool_long_type_node): Remove this macro definition.
(bool_long_long_type_node): New macro definition

gcc/testsuite/ChangeLog:

2018-04-10  Kelvin Nilsen  <kelvin@gcc.gnu.org>

* gcc.target/powerpc/vec-ldl-1.c: New test.
* gcc.dg/vmx/ops-long-1.c: Correct test programs to reflect
corrections to ABI implementation.

From-SVN: r259294

PR debug/65821 - wrong location for main().

* call.c (clear_location_r, convert_default_arg): Revert.
* tree.c (break_out_target_exprs): Add clear_location parm.
(struct bot_data): New.
(bot_manip): Clear location if requested.
* init.c (get_nsdmi): Pass clear_location.

From-SVN: r259291

[PR target/85056] Address -Wmaybe-uninitialized diagnostic

gcc/testsuite/
* gcc.target/nvptx/pr85056.c (main): Initialize "sum".

From-SVN: r259288

cppopts.texi: Use "side effect" instead of side-effect.

gcc/ChangeLog:

* doc/cppopts.texi: Use "side effect" instead of side-effect.
* doc/extend.texi: Same.
* doc/generic.texi: Same.
* doc/implement-c.texi: Same.
* doc/invoke.texi: Same.
* doc/md.texi: Same.
* doc/rtl.texi: Same.
* doc/tree-ssa.texi: Same.

From-SVN: r259287

Update links to archived copy of SGI STL docs

* doc/xml/faq.xml: Update links to archived copy of SGI STL docs.
* doc/xml/manual/backwards_compatibility.xml: Likewise.
* doc/xml/manual/containers.xml: Likewise.
* doc/xml/manual/debug_mode.xml: Likewise.
* doc/xml/manual/extensions.xml: Likewise.
* doc/xml/manual/policy_data_structures_biblio.xml: Likewise.
* doc/xml/manual/using.xml: Likewise.
* doc/xml/manual/utilities.xml: Likewise.

From-SVN: r259286

re PR rtl-optimization/85300 (ICE in exact_int_to_float_conversion_p, at simplify-rtx.c:895)

PR rtl-optimization/85300
* combine.c (subst): Handle subst of CONST_SCALAR_INT_P new_rtx also
into FLOAT and UNSIGNED_FLOAT like ZERO_EXTEND, return a CLOBBER if
simplify_unary_operation fails.

* gcc.dg/pr85300.c: New test.

From-SVN: r259285

gdbhooks: Add new pretty-printers for: varpool_node, symtab_node, cgraph_edge and ipa_ref.

2018-04-10  Martin Liska  <mliska@suse.cz>

* gdbhooks.py: Add pretty-printers for varpool_node, symtab_node,
cgraph_edge and ipa_ref.

From-SVN: r259283

Show pertinent parameter (PR c++/85110)

gcc/cp/ChangeLog:
PR c++/85110
* call.c (get_fndecl_argument_location): Make non-static.
* cp-tree.h (get_fndecl_argument_location): New decl.
* typeck.c (convert_for_assignment): When complaining due to
conversions for an argument, show the location of the parameter
within the decl.

gcc/testsuite/ChangeLog:
PR c++/85110
* g++.dg/cpp1z/direct-enum-init1.C: Update for the cases
where we now show the pertinent parameter.
* g++.dg/diagnostic/aka2.C: Likewise.
* g++.dg/diagnostic/param-type-mismatch-2.C: Likewise.

From-SVN: r259282

PR libstdc++/85222 allow catching iostream errors as gcc4-compatible ios::failure

Define a new exception type derived from std::ios::failure[abi:cxx11]
which also aggregates an object of the gcc4-compatible ios::failure
type. Make __throw_ios_failure throw this new type for iostream errors
that raise exceptions. Provide custom type info for the new type so that
it can be caught by handlers for the gcc4-compatible ios::failure type
as well as handlers for ios::failure[abi:cxx11] and its bases.

PR libstdc++/85222
* src/c++11/Makefile.am [ENABLE_DUAL_ABI]: Add special rules for
cxx11-ios_failure.cc to rewrite type info for __ios_failure.
* src/c++11/Makefile.in: Regenerate.
* src/c++11/cxx11-ios_failure.cc (__ios_failure, __iosfail_type_info):
New types.
[_GLIBCXX_USE_DUAL_ABI] (__throw_ios_failure): Define here.
* src/c++11/ios.cc (__throw_ios_failure): Remove definition.
* src/c++98/ios_failure.cc (__construct_ios_failure)
(__destroy_ios_failure, is_ios_failure_handler): New functions.
[!_GLIBCXX_USE_DUAL_ABI] (__throw_ios_failure): Define here.
* testsuite/27_io/ios_base/failure/dual_abi.cc: New.
* testsuite/27_io/basic_ios/copyfmt/char/1.cc: Revert changes to
handler types, to always catch std::ios_base::failure.
* testsuite/27_io/basic_ios/exceptions/char/1.cc: Likewise.
* testsuite/27_io/basic_istream/extractors_arithmetic/char/
exceptions_failbit.cc: Likewise.
* testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/
exceptions_failbit.cc: Likewise.
* testsuite/27_io/basic_istream/extractors_other/char/
exceptions_null.cc: Likewise.
* testsuite/27_io/basic_istream/extractors_other/wchar_t/
exceptions_null.cc: Likewise.
* testsuite/27_io/basic_istream/sentry/char/12297.cc: Likewise.
* testsuite/27_io/basic_istream/sentry/wchar_t/12297.cc: Likewise.
* testsuite/27_io/basic_ostream/inserters_other/char/
exceptions_null.cc: Likewise.
* testsuite/27_io/basic_ostream/inserters_other/wchar_t/
exceptions_null.cc: Likewise.
* testsuite/27_io/ios_base/storage/2.cc: Likewise.

From-SVN: r259281

PR c++/85312 - P0962 cleanup

PR c++/85312 - P0962 cleanup
* parser.c (cp_parser_perform_range_for_lookup): Remove unreachable
diagnostics.

From-SVN: r259279

PR debug/65821 - wrong location for main().

* call.c (clear_location_r): New.
(convert_default_arg): Use it.
* tree.c (bot_manip): Remove builtin_LINE/FILE handling.

From-SVN: r259278

PR c++/85285 - ICE with flexible array after substitution.

* pt.c (instantiate_class_template_1): Check for flexible array in
union.

From-SVN: r259277

* parser.c (cp_parser_check_template_parameters): Improve comment.

From-SVN: r259276

re PR fortran/85313 (gcc/fortran/openmp.c: 2 * confused logic ?)

PR fortran/85313
* openmp.c (resolve_omp_do): Remove bogus if (j < i) break;.
(resolve_oacc_nested_loops): Likewise.  Formatting fix.

* gfortran.dg/gomp/pr85313.f90: New test.

From-SVN: r259275

Fix obvious error in handling of error attribute (PR lto/85248).

2018-04-10  Martin Liska  <mliska@suse.cz>

PR lto/85248
* lto-symtab.c (lto_symtab_merge_p): Do not check for
TREE_VALUES of error attributes.

From-SVN: r259274

re PR c++/24314 (Extra "template<>" in partial specialization is compiled successfuly.)

2018-04-10  Paolo Carlini  <paolo.carlini@oracle.com>

PR c++/24314
* g++.dg/parse/template29.C: New.

From-SVN: r259273

re PR testsuite/85190 (gcc.dg/vect/pr81196.c FAILs)

gcc/testsuite
PR testsuite/85190
* gcc.dg/vect/pr81196.c: Adjust pointer for aligned access.

From-SVN: r259272

re PR target/85177 (wrong code with -O -fno-tree-ccp -fno-tree-sra -mavx512f)

PR target/85177
PR target/85255
* config/i386/sse.md
(<extract_type>_vinsert<shuffletype><extract_suf>_mask): Fix
computation of the VEC_MERGE selector from mask.
(<extract_type>_vinsert<shuffletype><extract_suf>_1<mask_name>):
Fix decoding of the VEC_MERGE selector into mask.

* gcc.target/i386/avx512f-pr85177.c: New test.
* gcc.target/i386/avx512f-pr85255.c: New test.

From-SVN: r259269

Add missing cases to vect_get_smallest_scalar_type (PR 85286)

In this PR we used WIDEN_SUM_EXPR to vectorise:

  short i, y;
  int sum;
  [...]
  for (i = x; i > 0; i--)
    sum += y;

with 4 ints and 8 shorts per vector.  The problem was that we set
the VF based only on the ints, then calculated the number of vector
copies based on the shorts, giving 4/8.  Previously that led to
ncopies==0, but after r249897 we pick it up as an ICE.

In this particular case we could vectorise the reduction by setting
ncopies based on the output type rather than the input type, but it
doesn't seem worth adding a special "optimisation" for such a
pathological case.  I think it's really an instance of the more general
problem that we can't vectorise using combinations of (say) 64-bit and
128-bit vectors on targets that support both.

2018-04-10  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
PR tree-optimization/85286
* tree-vect-data-refs.c (vect_get_smallest_scalar_type):

gcc/testsuite/
PR tree-optimization/85286
* gcc.dg/vect/pr85286.c: New test.

From-SVN: r259268

Set insn_last_address in final_1

final_1 already sets insn_current_address for each instruction, making
it possible to use some of the address functions in final.c during
assembly generation.  This patch also sets insn_last_address, since
as the comment says, we can treat final as a shorten_branches pass that
does nothing.  It's then possible to use insn_current_reference_address
during final as well.

This is needed for the aarch64.md definitions of far_branch to work:

   (set (attr "far_branch")
(if_then_else (and (ge (minus (match_dup 2) (pc)) (const_int -1048576))
   (lt (minus (match_dup 2) (pc)) (const_int 1048572)))
      (const_int 0)
      (const_int 1)))]

This value (tested only during final) uses the difference between
the INSN_ADDRESSES of operand 2 and insn_current_reference_address
to calculate a conservatively-correct estimate of the branch distance.
It takes into account the worst-case gap due to alignment, whereas
a direct comparison of INSN_ADDRESSES would give an unreliable,
optimistic result.

2018-04-10  Richard Sandiford  <richard.sandiford@linaro.org>

gcc/
* final.c (final_1): Set insn_last_address as well as
insn_current_address.

From-SVN: r259267

[explow] PR target/85173: validize memory before passing it on to target probe_stack

In this PR the expansion code emits an invalid memory address for the stack probe, which the backend fails to recognise.
The address is created explicitly in anti_adjust_stack_and_probe_stack_clash in explow.c and passed down to gen_probe_stack
without any validation in emit_stack_probe.

This patch fixes the ICE by calling validize_mem on the memory location before passing it down to the target.
Jakub pointed out that we also want to create valid addresses for the probe_stack_address case, so this patch
creates an expand operand and legitimizes it before passing it down to the probe_stack_address expander.

This patch passes bootstrap and testing on arm-none-linux-gnueabihf and aarch64-none-linux-gnu
and ppc64le-redhat-linux on gcc112 in the compile farm.

PR target/85173
* explow.c (emit_stack_probe): Call validize_mem on memory location
before passing it to gen_probe_stack.  Create address operand and
legitimize it for the probe_stack_address case.

* gcc.target/arm/pr85173.c: New test.

From-SVN: r259266

Be more carefull about DECL merging in LTO (PR lto/85248).

2018-04-10  Richard Biener  <rguenther@suse.de>
    Martin Liska  <mliska@suse.cz>

PR lto/85248
* lto-symtab.c (lto_symtab_merge_p): Handle noreturn attribute.
2018-04-10  Jakub Jelinek  <jakub@redhat.com>

PR lto/85248
* gcc.dg/lto/pr85248_0.c: New test.
* gcc.dg/lto/pr85248_1.c: New test.

From-SVN: r259265

re PR lto/85078 (LTO ICE: tree check: expected tree that contains 'decl minimal' structure, have 'identifier_node' in decl_mangling_context, at cp/mangle.c:878)

PR lto/85078
* ipa-devirt.c (rebuild_type_inheritance-hash): New.
* ipa-utils.h (rebuild_type_inheritance-hash): Declare.
* tree.c (free_lang_data_in_type): Fix handling of binfos;
walk basetypes.
(free_lang_data): Rebuild type inheritance graph.
* g++.dg/torture/pr85078.C: New.

From-SVN: r259264

Daily bump.

From-SVN: r259263

re PR c++/85227 (ICE with structured binding of a forward declared variable)

/cp
2018-04-09  Paolo Carlini  <paolo.carlini@oracle.com>

PR c++/85227
* decl.c (cp_finish_decomp): In a template, if the type is incomplete
issue a pedwarn and defer trying to do bindings.

/testsuite
2018-04-09  Paolo Carlini  <paolo.carlini@oracle.com>

PR c++/85227
* g++.dg/cpp1z/decomp44.C: New.
* g++.dg/cpp1z/decomp45.C: Likewise.

From-SVN: r259259

re PR fortran/83064 (DO CONCURRENT and auto-parallelization)

2018-04-09  Thomas Koenig  <tkoenig@gcc.gnu.org>

PR fortran/83064
* trans-stmt.c (gfc_trans_forall_loop): Remove annotation for
parallell processing of DO CONCURRENT -ftree-parallelize-loops
is set.

2018-04-09  Thomas Koenig  <tkoenig@gcc.gnu.org>

PR fortran/83064
* gfortran.dg/do_concurrent_5.f90: New test.
* gfortran.dg/vect/vect-do-concurrent-1.f90: Adjust dg-bogus
message.

From-SVN: r259258

PR c++/85279 - dump_expr doesn't understand decltype.

* error.c (dump_expr): Handle DECLTYPE_TYPE.

From-SVN: r259257

re PR fortran/51260 (PARAMETER array with constructor initializer: Compile-time simplify single element access)

2018-04-09  Thomas Koenig  <tkoenig@gcc.gnu.org>

PR fortran/51260
* resolve.c (resolve_variable): Simplify cases where access to a
parameter array results in a single constant.

2018-04-09  Thomas Koenig  <tkoenig@gcc.gnu.org>

PR fortran/51260
* gfortran.dg/parameter_array_element_3.f90: New test.

From-SVN: r259256

PR c++/85262 - ICE with redundant qualification on constructor.

* call.c (build_new_method_call_1): Move make_args_non_dependent
after A::A() handling.

From-SVN: r259255

PR c++/85277 - ICE with invalid offsetof.

* semantics.c (finish_offsetof): Avoid passing non-DECL to %qD.
Adjust -Winvalid-offsetof diagnostic to say conditionally supported.

From-SVN: r259254

PR c++/85264 - ICE with excess template-parameter-list.

* parser.c (cp_parser_check_template_parameters): Add template_id_p
parameter.  Don't allow an extra template header if true.
(cp_parser_class_head): Pass template_id_p.
(cp_parser_elaborated_type_specifier): Likewise.
(cp_parser_alias_declaration): Likewise.
(cp_parser_check_declarator_template_parameters): Likewise.

From-SVN: r259253

re PR c++/85194 (ICE with structured binding in broken for-loop)

PR c++/85194
* parser.c (cp_parser_simple_declaration): For structured bindings,
if *maybe_range_for_decl is NULL after parsing it, set it to
error_mark_node.

* g++.dg/cpp1z/decomp43.C: New test.

From-SVN: r259252

invoke.texi (-finline-small-functions): Mention other optimization options.

gcc/doc/ChangeLog:

* invoke.texi (-finline-small-functions): Mention other optimization
options.
(-findirect-inlining, -fpartial-inlining): Same.
(-finline-functions-called-once): Same.
(-freorder-blocks-and-partition): Same.

From-SVN: r259250

re PR rtl-optimization/80463 (ICE with -fselective-scheduling2 and -fvar-tracking-assignments)

PR rtl-optimization/80463
* g++.dg/pr80463.C: Add -w to dg-options.

From-SVN: r259249

re PR rtl-optimization/84058 (RTl partitioning fixup should drag very small blocks back to hot partition)

PR rtl/84058
* cfgcleanup.c (try_forward_edges): Do not give up on crossing
jumps; choose last target that matches the criteria (i.e.
no partition changes for non-crossing jumps).
* cfgrtl.c (cfg_layout_redirect_edge_and_branch): Add basic
support for redirecting crossing jumps to non-crossing.

From-SVN: r259244

PR c++/85256 - ICE capturing pointer to VLA.

* lambda.c (add_capture): Distinguish between variable-size and
variably-modified types.

From-SVN: r259240

* g++.dg/opt/pr85196.C: Fix for -std=c++17.

From-SVN: r259239

[ARC] Fix stack usage info for naked functions.

gcc/
2018-04-09  Alexey Brodkin <abrodkin@synopsys.com>

* config/arc/arc.c (arc_expand_prologue): Set stack usage info
also for naked functions.

From-SVN: r259238

[ARC] Add/update combiner patterns.

gcc/
2018-01-26  Claudiu Zissulescu  <claziss@synopsys.com>

* config/arc/arc.md (add_shift): New pattern.
(add_shift2): Likewise.
(sub_shift): Likewise.
(sub_shift_cmp0_noout): Likewise.
(compare_si_ashiftsi): Likewise.
(xbfu_cmp0_noout): New combine pattern.
(xbfu_cmp0"): Likewise.
(movsi_set_cc_insn): Place the predicable variant first.
(commutative_binary_cmp0_noout): Remove clobber.
(commutative_binary_cmp0): New pattern.
(noncommutative_binary_cmp0): Likewise.
(noncommutative_binary_cmp0_noout): Likewise.
(noncommutative_binary_comparison_result_used): Removed.
(rsub_cmp0): New pattern.
(rsub_cmp0_noout): Likewise.
(extzvsi): Changed, keep only meaningful variants.
(SQH, SEZ): New iterators.
(SQH_postfix): New mode attribute.
(SEZ_prefix): New code attribute.
(<SEZ_prefix>xt<SQH_postfix>_cmp0_noout): New instruction pattern.
(<SEZ_prefix>xt<SQH_postfix>_cmp0): Likewise.
* config/arc/predicates.md (cc_set_register): Use CC_REG instead
of numerical value.
(noncommutative_operator): Check the availability of barrel
shifter option.

From-SVN: r259237

re PR tree-optimization/85284 (Loop miscompilation starting with r238367)

2018-04-09  Richard Biener  <rguenther@suse.de>

PR tree-optimization/85284
* tree-ssa-loop-niter.c (number_of_iterations_exit_assumptions):
Only use the niter constraining form of simple_iv when the exit
is always executed.

* gcc.dg/torture/pr85284.c: New testcase.

From-SVN: r259234

[nvptx] Add memory_barrier insn

2018-04-09  Tom de Vries  <tom@codesourcery.com>

PR target/84041
* config/nvptx/nvptx.md (define_c_enum "unspecv"): Add UNSPECV_MEMBAR.
(define_expand "*memory_barrier"): New define_expand.
(define_insn "memory_barrier"): New insn.

From-SVN: r259233

re PR rtl-optimization/80463 (ICE with -fselective-scheduling2 and -fvar-tracking-assignments)

       PR rtl-optimization/80463
       PR rtl-optimization/83972
       PR rtl-optimization/83480

       * sel-sched-ir.c (has_dependence_note_mem_dep): Take into account the
       correct producer for the insn.
       (tidy_control_flow): Fixup seqnos in case of debug insns.

       * gcc.dg/pr80463.c: New test.
       * g++.dg/pr80463.C: Likewise.
       * gcc.dg/pr83972.c: Likewise.

From-SVN: r259231

re PR rtl-optimization/83913 (Compile time and memory hog w/ selective scheduling)

       PR rtl-optimization/83913

       * sel-sched-ir.c (merge_expr_data): Choose the middle between two
       different sched-times when merging exprs.

       * gcc.dg/pr83913.c: New test.

From-SVN: r259230

re PR rtl-optimization/83962 (ICE: verify_flow_info failed (too many outgoing branch edges from bb 8))

       PR rtl-optimization/83962

       * sel-sched-ir.c (tidy_control_flow): Correct the order in which we call
       tidy_fallthru_edge and tidy_control_flow.

       * gcc.dg/pr83962.c: New test.

From-SVN: r259229

re PR rtl-optimization/83530 (ICE in reset_sched_cycles_in_current_ebb, at sel-sched.c:7150)

       PR rtl-optimization/83530

       * sel-sched.c (force_next_insn): New global variable.
       (remove_insn_for_debug): When force_next_insn is true, also leave only
       next insn in the ready list.
       (sel_sched_region): When the region wasn't scheduled, make another pass
       over it with force_next_insn set to 1.

       * gcc.dg/pr83530.c: New test.

From-SVN: r259228

Daily bump.

From-SVN: r259227

invoke.texi (-Wrestrict, [...]): Tweak text.

gcc/ChangeLog:

* invoke.texi (-Wrestrict, -fprintf-return-value): Tweak text.

From-SVN: r259224

[NDS32] Add intrinsic functions for interrupt control.

gcc/
* config.gcc (nds32le-*-*, nds32be-*-*): Add nds32/nds32_intrinsic.h
into tm_file.
* config/nds32/constants.md (unspec_volatile_element): Add enum values
for interrupt control.
* config/nds32/nds32-intrinsic.c: Implementation of intrinsic
functions for interrupt control.
* config/nds32/nds32-intrinsic.md: Likewise.
* config/nds32/nds32_intrinsic.h: Likewise.
* config/nds32/nds32.h (nds32_builtins): Likewise.

From-SVN: r259223

[NDS32] Add strict_aligned_p to machine_function and implement TARGET_EXPAND_TO_RTL_HOOK.

gcc/
* config/nds32/nds32.c (nds32_init_machine_status,
nds32_legitimate_index_p, nds32_legitimate_address_p): Consider
strict_aligned_p field.
(nds32_expand_to_rtl_hook): New function.
(TARGET_EXPAND_TO_RTL_HOOK): Define.
* config/nds32/nds32.h (machine_function): Add strict_aligned_p field.

From-SVN: r259222

[NDS32] Implement n7 pipeline.

gcc/
* config.gcc (nds32*-*-*): Check that n7 is valid to --with-cpu.
* config/nds32/nds32-n7.md: New file.
* config/nds32/nds32-opts.h (nds32_cpu_type): Add CPU_N7.
* config/nds32/nds32-pipelines-auxiliary.c: Implementation for n7
pipeline.
* config/nds32/nds32-protos.h: More declarations for n7 pipeline.
* config/nds32/nds32.md (pipeline_model): Add n7.
* config/nds32/nds32.opt (mcpu): Support n7 pipeline cpus.
* config/nds32/pipelines.md: Include n7 settings.

Co-Authored-By: Chung-Ju Wu <jasonwucj@gmail.com>
From-SVN: r259221

[NDS32] Implement e8 pipeline.

gcc/
* config.gcc (nds32*-*-*): Check that e8 is valid to --with-cpu.
* config/nds32/nds32-e8.md: New file.
* config/nds32/nds32-opts.h (nds32-cpu_type): Add CPU_E8.
* config/nds32/nds32-pipelines-auxiliary.c: Implementation for e8
pipeline.
* config/nds32/nds32-protos.h: More declarations for e8 pipeline.
* config/nds32/nds32.md (pipeline_model): Add e8.
* config/nds32/nds32.opt (mcpu): Support e8 pipeline cpus.
* config/nds32/pipelines.md: Include e8 settings.

Co-Authored-By: Chung-Ju Wu <jasonwucj@gmail.com>
From-SVN: r259220

[NDS32] Implement n8 pipeline.

gcc/
* config.gcc (nds32*-*-*): Check that n6/n8/s8 are valid to --with-cpu.
* config/nds32/nds32-n8.md: New file.
* config/nds32/nds32-opts.h (nds32_cpu_type): Add CPU_N6 and CPU_N8.
* config/nds32/nds32-pipelines-auxiliary.c: Implementation for n8
pipeline.
* config/nds32/nds32-protos.h: More declarations for n8 pipeline.
* config/nds32/nds32-utils.c: More implementations for n8 pipeline.
* config/nds32/nds32.md (pipeline_model): Add n8.
* config/nds32/nds32.opt (mcpu): Support n8 pipeline cpus.
* config/nds32/pipelines.md: Include n8 settings.

Co-Authored-By: Chung-Ju Wu <jasonwucj@gmail.com>
From-SVN: r259219

[NDS32] Implment n9 pipeline.

gcc/
* config.gcc (nds32*): Add nds32-utils.o into extra_objs.
* config/nds32/nds32-n9-2r1w.md: New file.
* config/nds32/nds32-n9-3r2w.md: New file.
* config/nds32/nds32-opts.h (nds32_cpu_type, nds32_mul_type,
nds32_register_ports): New or modify for cpu n9.
* config/nds32/nds32-pipelines-auxiliary.c: Implementation for n9
pipeline.
* config/nds32/nds32-protos.h: More declarations for n9 pipeline.
* config/nds32/nds32-utils.c: New file.
* config/nds32/nds32.h (TARGET_PIPELINE_N9, TARGET_PIPELINE_SIMPLE,
TARGET_MUL_SLOW): Define.
* config/nds32/nds32.md (pipeline_model): New attribute.
* config/nds32/nds32.opt (mcpu, mconfig-mul, mconfig-register-ports):
New options that support cpu n9.
* config/nds32/pipelines.md: Include n9 settings.
* config/nds32/t-nds32 (nds32-utils.o): Add dependency.

Co-Authored-By: Chung-Ju Wu <jasonwucj@gmail.com>
From-SVN: r259218

[NDS32] New option -malways-align and -malign-functions.

gcc/
* config/nds32/nds32-md-auxiliary.c (output_cond_branch): Output align
information if necessary.
(output_cond_branch_compare_zero): Likewise.
* config/nds32/nds32.c (nds32_adjust_insn_length): Consider align case.
(nds32_target_alignment): Refine for alignment.
* config/nds32/nds32.h (NDS32_ALIGN_P): Define.
(FUNCTION_BOUNDARY): Modify.
* config/nds32/nds32.md (call_internal, call_value_internal): Consider
align case.
* config/nds32/nds32.opt (malways-align, malign-functions): New.

From-SVN: r259217

[NDS32] Add intrinsic functions for TLB operation and data prefech.

gcc/
* config/nds32/constants.md (unspec_volatile_element): Add values for
TLB operation and data prefetch.
* config/nds32/nds32-intrinsic.c: Implementation of intrinsic
functions for TLB operation and data prefetch.
* config/nds32/nds32-intrinsic.md: Likewise.
* config/nds32/nds32_intrinsic.h: Likewise.
* config/nds32/nds32.c (nds32_dpref_names): Likewise.
(nds32_print_operand): Likewise.
* config/nds32/nds32.h (nds32_builtins): Likewise.

From-SVN: r259216

Daily bump.

From-SVN: r259215

re PR middle-end/82976 (Error: non-trivial conversion at assignment since r254526)

2018-04-07  Thomas Koenig  <tkoenig@gcc.gnu.org>
Andrew Pinski <pinsika@gcc.gnu.org>

PR middle-end/82976
* match.pd: Use constant_boolean_node of correct type instead of
boolean_true_node or boolean_false_node for simplifying
pointer comparisons to zero.

2018-04-07  Thomas Koenig  <tkoenig@gcc.gnu.org>

PR middle-end/82976
* gfortran.dg/realloc_on_assign_16a.f90: New test.

Co-Authored-By: Andrew Pinski <pinskia@gcc.gnu.org>
From-SVN: r259212

re PR tree-optimization/80021 (untranslateable diagnostic "type variant differs by " #flag ".")

PR tree-optimization/80021
* tree.c (verify_type_variant): Make error call in verify_variant_match
translatable and remove final full stop.

From-SVN: r259211

[NDS32] Support dwarf exception handling.

gcc/
* config/nds32/constants.md (unspec_volatile_element): Add
UNSPEC_VOLATILE_EH_RETURN.
* config/nds32/nds32-md-auxiliary.c (nds32_output_stack_push,
nds32_output_stack_pop): Support dwarf exception handling process.
* config/nds32/nds32-protos.h (nds32_dynamic_chain_address): Declare.
* config/nds32/nds32.c (nds32_init_machine_status): Support dwarf
exception handling process.
(nds32_compute_stack_frame): Likewise.
(nds32_return_addr_rtx): Likewise.
(nds32_initial_elimination_offset): Likewise.
(nds32_expand_prologue): Likewise.
(nds32_expand_epilogue): Likewise.
(nds32_dynamic_chain_address): New function.
* config/nds32/nds32.h (machine_function): Add fields for dwarf
exception handling.
(DYNAMIC_CHAIN_ADDRESS): Define.
(EH_RETURN_DATA_REGNO): Define.
(EH_RETURN_STACKADJ_RTX): Define.
* config/nds32/nds32.md (eh_return, nds32_eh_return): Implement
patterns for dwarf exception handling.

From-SVN: r259210

[NDS32] Clean up nds32.h.

gcc/
* config/nds32/nds32.h: Clean up obsolete macros.

From-SVN: r259209

[NDS32] Add intrinsic functions for particular instructions.

gcc/
* config/nds32/constants.md (unspec_element, unspec_volatile_element):
Add enum values for particular instructions.
* config/nds32/nds32-intrinsic.c: Implementation of expanding
particular intrinsic functions.
* config/nds32/nds32-intrinsic.md: Likewise.
* config/nds32/nds32_intrinsic.h: Likewise.
* config/nds32/nds32.h (nds32_builtins): Likewise.
* config/nds32/nds32.md (type): Add pbsad and pbsada.
(btst, ave): New patterns for particular instructions.

From-SVN: r259208

[NDS32] Add intrinsic functions for atomic load/store and memory sync.

gcc/
* config/nds32/constants.md (unspec_element, unspec_volatile_element):
Add enum values for atomic load/store and memory sync.
* config/nds32/nds32-intrinsic.c: Implementation for atomic load/store
and memory sync.
* config/nds32/nds32-intrinsic.md: Likewise.
* config/nds32/nds32_intrinsic.h: Likewise.
* config/nds32/nds32.h (nds32_builtins): Likewise.

From-SVN: r259207

re PR tree-optimization/85257 (wrong code with -O -fno-tree-ccp and reading zeroed vector member)

PR tree-optimization/85257
* fold-const.c (native_encode_vector): If not all elts could fit
and off is -1, return 0 rather than offset.
* tree-ssa-sccvn.c (vn_reference_lookup_3): Pass
(offseti - offset2) / BITS_PER_UNIT as 4th argument to
native_encode_expr.  Verify len * BITS_PER_UNIT >= maxsizei.  Don't
adjust buffer in native_interpret_expr call.

* gcc.dg/pr85257.c: New test.

From-SVN: r259206

[NDS32] Add intrinsic functions for cache control.

gcc/
* config/nds32/constants.md (unspec_volatile_element): Add cache
control enum values.
* config/nds32/nds32-intrinsic.c: Add cache control expand functions.
* config/nds32/nds32-intrinsic.md: Add cache control patterns.
* config/nds32/nds32.c (nds32_cctl_names): New.
(nds32_print_operand): Handle cache control register names.
* config/nds32/nds32.h (nds32_builtins): New enum values.
* config/nds32/nds32_intrinsic.h: Add cache control enum types and
macros.
* config/nds32/nds32.md (type): Add mmu.
* config/nds32/pipelines.md (simple_insn): Add mmu.

From-SVN: r259205

[NDS32] Remove unused insn type: call.

gcc/
* config/nds32/nds32.md (type): Remove call.
* config/nds32/pipelines.md (simple_insn): Likewise.

From-SVN: r259204

[NDS32] Add intrinsic functions for FPU.

gcc/
* config/nds32/constants.md (unspec_volatile_element): Add
UNSPEC_VOLATILE_FMFCSR, UNSPEC_VOLATILE_FMTCSR and
UNSPEC_VOLATILE_FMFCFG.
* config/nds32/nds32-intrinsic.c (bdesc_noarg): New builtin
description for fmfcfg and fmfcsr.
(bdesc_1arg): Add fmtcsr.
(bdesc_2arg): Add fcpynss, fcpyss, fcpynsd and fcpysd.
(nds32_expand_builtin_impl): Deal with FPU intrinsic functions.
* config/nds32/nds32-intrinsic.md (unspec_fcpynsd, unspec_fcpysd,
unspec_fcpynss, unspec_fcpysd, unspec_fcpyss, unspec_fmfcsr,
unspec_fmfcfg): New patterns.
* config/nds32/nds32.h (nds32_builtins): Add NDS32_BUILTIN_FMFCFG,
NDS32_BUILTIN_FMFCSR, NDS32_BUILTIN_FMTCSR, NDS32_BUILTIN_FCPYNSS,
NDS32_BUILTIN_FCPYSS,NDS32_BUILTIN_FCPYNSD and NDS32_BUILTIN_FCPYSD.
* config/nds32/nds32_intrinsic.h (__nds32__fcpynsd, __nds32__fcpynss,
__nds32__fcpysd, __nds32__fcpyss, __nds32__fmfcsr, __nds32__fmtcsr,
__nds32__fmfcfg): Define.

From-SVN: r259203

[NDS32] Add more intrinsic register names.

gcc/
* config/nds32/nds32.c (nds32_intrinsic_register_names): Add more
intrinsic register names.
* config/nds32/nds32_intrinsic.h (nds32_intrinsic_registers): Add more
intrinsic register enum values and macros.

From-SVN: r259202

[NDS32] Support [$ra + $rb << 3] form for load/store address.

gcc/
* config/nds32/nds32.c (nds32_legitimate_index_p): Modify condition
for load/store addressing form.
(nds32_print_operand_address): Likewise.

From-SVN: r259201

Daily bump.

From-SVN: r259200

re PR middle-end/85196 (ICE in extract_insn, at recog.c:2311: unrecognizable insn)

PR target/85196
* config/sparc/sparc.c (sparc_expand_move): Deal with symbolic operands
based on LABEL_REF.  Remove useless assertion.
(pic_address_needs_scratch): Fix formatting.
(sparc_legitimize_pic_address): Minor tweaks.
(sparc_delegitimize_address): Adjust assertion accordingly.
* config/sparc/sparc.md (movsi_pic_label_ref): Change label_ref_operand
into symbolic_operand.
(movsi_high_pic_label_ref): Likewise.
(movsi_lo_sum_pic_label_ref): Likewise.
(movdi_pic_label_ref): Likewise.
(movdi_high_pic_label_ref): Likewise.
(movdi_lo_sum_pic_label_ref): Likewise.

From-SVN: r259194

Fix ChangeLog

From-SVN: r259193

config.gcc (x86_64-*-rtems*): Add rtems.h to tm_file for custom LIB_SPEC setup.

2018-04-06  Amaan Cheval  <amaan.cheval@gmail.com>

* config.gcc (x86_64-*-rtems*): Add rtems.h to tm_file for
custom LIB_SPEC setup.

From-SVN: r259192

RISC-V: Support for FreeBSD.

gcc/
* config.gcc (riscv*-*-freebsd*): Add RISC-V FreeBSD support.
* config/riscv/freebsd.h: New.
libgcc/
* config.host (riscv*-*-freebsd*): Add RISC-V FreeBSD support.

From-SVN: r259190

re PR libfortran/85253 (asan detects heap-buffer-overflow in matmul_r4.c)

2018-04-06  Thomas Koenig  <tkoenig@gcc.gnu.org>

PR libfortran/85253
* m4/matmul_internal.m4: If ycount == 1, add one more row to
the internal buffer.
* generated/matmul_c10.c: Regenerated.
* generated/matmul_c16.c: Regenerated.
* generated/matmul_c4.c: Regenerated.
* generated/matmul_c8.c: Regenerated.
* generated/matmul_i1.c: Regenerated.
* generated/matmul_i16.c: Regenerated.
* generated/matmul_i2.c: Regenerated.
* generated/matmul_i4.c: Regenerated.
* generated/matmul_i8.c: Regenerated.
* generated/matmul_r10.c: Regenerated.
* generated/matmul_r16.c: Regenerated.
* generated/matmul_r4.c: Regenerated.
* generated/matmul_r8.c: Regenerated.
* generated/matmulavx128_c10.c: Regenerated.
* generated/matmulavx128_c16.c: Regenerated.
* generated/matmulavx128_c4.c: Regenerated.
* generated/matmulavx128_c8.c: Regenerated.
* generated/matmulavx128_i1.c: Regenerated.
* generated/matmulavx128_i16.c: Regenerated.
* generated/matmulavx128_i2.c: Regenerated.
* generated/matmulavx128_i4.c: Regenerated.
* generated/matmulavx128_i8.c: Regenerated.
* generated/matmulavx128_r10.c: Regenerated.
* generated/matmulavx128_r16.c: Regenerated.
* generated/matmulavx128_r4.c: Regenerated.
* generated/matmulavx128_r8.c: Regenerated.

From-SVN: r259188

[NDS32] Refine ADJUST_INSN_LENGTH implementation.

gcc/
* config/nds32/nds32.c (nds32_adjust_insn_length): Refine.
* config/nds32/nds32.h (ADJUST_INSN_LENGTH): Change the location in
file.

From-SVN: r259187

[NDS32] Refine call and return patterns.

gcc/
* config/nds32/nds32-md-auxiliary.c (nds32_output_return,
nds32_output_call, nds32_symbol_binds_local_p): New functions.
* config/nds32/nds32-protos.h (nds32_output_call,
nds32_output_return): Declare.
* config/nds32/nds32.md: Refine all the call and return patterns.

Co-Authored-By: Kito Cheng <kito.cheng@gmail.com>
From-SVN: r259186

PR c++/85214 - ICE with alias, generic lambda, constexpr if.

Here, since the condition for the constexpr if depends on the type of 'j',
it's still dependent when we are partially instantiating the inner lambda,
so we need to defer instantiating the constexpr if.  When we instantiated
the inner lambda, we tried to substitute into the typename, which failed
because we didn't have a declaration of 'i' available.

Fixed by teaching extract_locals_r to capture local typedefs such as 'ar';
if we have the typedef handy, we don't need to substitute into its
definition.

* pt.c (extract_locals_r): Remember local typedefs.

From-SVN: r259185

C++: more std header hints; filter on C++ dialect (PR c++/84269)

This patch adds more suggestions as per:
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84269#c10
some of which need C++14 and C++17, and some of which use headers that
exist in earlier standards.

For example, <memory> exists in C++98, but if the user attempts to
use std::make_shared with -std=c++98, they are suggested to include
<memory>, even if they've already included it.

This patch adds the missing names, and fixes the nonsensical suggestions
by detecting if the name isn't available yet, based on the user's
dialect, and reporting things more intelligently:

t.cc: In function 'void test_make_shared()':
t.cc:5:8: error: 'make_shared' is not a member of 'std'
   std::make_shared<int>();
        ^~~~~~~~~~~
t.cc:5:8: note: 'std::make_shared' is only available from C++11 onwards

gcc/cp/ChangeLog:
PR c++/84269
* name-lookup.c (struct std_name_hint): Move out of
get_std_name_hint; add field "min_dialect".
(get_std_name_hint): Add min_dialect values to all initializers.
Add <any>, <atomic>, <bitset>, <condition_variable>, <functional>,
<future>, <istream>, <iterator>, <ostream>, <mutex>, <optional>,
<shared_mutex>, <string_view>, <thread>, and <variant>.
Add fstream, ifstream, and ofstream to <fstream>.
Add istringstream, ostringstream, and stringstream to <sstream>.
Add basic_string to <string>.
Add tuple_element and tuple_size to <tuple>.
Add declval to <utility>.
Fix ordering of <queue> and <tuple>.
Return a std_name_hint, rather than a const char *.
(get_cxx_dialect_name): New function.
(maybe_suggest_missing_std_header): Detect names that aren't yet
available in the current dialect, and instead of suggesting a
missing #include, warn about the dialect.

gcc/testsuite/ChangeLog:
PR c++/84269
* g++.dg/lookup/missing-std-include-6.C: Move std::array and
std::tuple here since they need C++11.
* g++.dg/lookup/missing-std-include-8.C: New test.
* g++.dg/lookup/missing-std-include.C: Move std::array and
std::tuple test to missing-std-include-6.C to avoid failures
with C++98.

From-SVN: r259184

re PR debug/85252 (ICE with -g for static zero-length array initialization)

PR debug/85252
* dwarf2out.c (rtl_for_decl_init): For STRING_CST initializer only
build CONST_STRING if TYPE_MAX_VALUE is non-NULL and is INTEGER_CST.

* gcc.dg/debug/pr85252.c: New test.

From-SVN: r259183

re PR rtl-optimization/84872 (ICE in create_preheader, at cfgloopmanip.c:1536)

PR rtl-optimization/84872
* cfgloopmanip.c (create_preheader): Use make_forwarder_block even if
nentry == 1 when CP_FALLTHRU_PREHEADERS and single_entry is
EDGE_CROSSING edge.

* gcc.dg/graphite/pr84872.c: New test.

From-SVN: r259182

re PR c++/85210 (ICE with broken structured binding in template)

PR c++/85210
* pt.c (tsubst_decomp_names): Return error_mark_node and assert
errorcount is set if tsubst doesn't return a VAR_DECL.

* g++.dg/cpp1z/decomp42.C: New test.

From-SVN: r259181

C++: suggest missing headers for implicit use of "std" (PR c++/85021)

We provide fix-it hints for the most common "std" names when an explicit
"std::" prefix is present, however we don't yet provide fix-it hints for
this implicit case:

  using namespace std;
  void f() {  cout << "test"; }

for which we emit:

  t.cc: In function 'void f()':
  t.cc:2:13: error: 'cout' was not declared in this scope
  void f() {  cout << "test"; }
              ^~~~

This patch detects if a "using namespace std;" directive is present
in the current namespace, and if so, offers a suggestion for
unrecognized names that are in our list of common "std" names:

  t.cc: In function 'void f()':
  t.cc:2:13: error: 'cout' was not declared in this scope
   void f() {  cout << "test"; }
               ^~~~
  t.cc:2:13: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
  +#include <iostream>
   using namespace std;
   void f() {  cout << "test"; }
               ^~~~

gcc/cp/ChangeLog:
PR c++/85021
* name-lookup.c (using_directives_contain_std_p): New function.
(has_using_namespace_std_directive_p): New function.
(suggest_alternatives_for): Simplify if/else logic using early
returns.  If no candidates were found, and there's a
"using namespace std;" directive, call
maybe_suggest_missing_std_header.
(maybe_suggest_missing_header): Split later part of the function
into..
(maybe_suggest_missing_std_header): New.

gcc/testsuite/ChangeLog:
PR c++/85021
* g++.dg/lookup/missing-std-include-7.C: New test.

From-SVN: r259179

PR c++/85242 - ICE with class definition in template parm.

* cp-tree.h (PROCESSING_REAL_TEMPLATE_DECL_P): False if
processing_template_parmlist.

From-SVN: r259178

PR c++/85240 - LTO ICE with using of undeduced auto fn.

* cp-gimplify.c (cp_genericize_r): Discard using of undeduced auto.

From-SVN: r259177

Reverted commit r254862

From-SVN: r259169

re PR tree-optimization/85244 (Bad optimisation with flexible array member (may be related to -ftree-dominator-opts))

2018-04-06  Richard Biener  <rguenther@suse.de>

PR middle-end/85244
* tree-dfa.c (get_ref_base_and_extent): Reset seen_variable_array_ref
after seeing a component reference with an adjacent field.  Treat
refs to arrays at struct end of external decls similar to
refs to unconstrained commons.

* gcc.dg/torture/pr85244-1.c: New testcase.
* gcc.dg/torture/pr85244-2.c: Likewise.

From-SVN: r259168

re PR sanitizer/85213 (-fsanitize=undefined internal compiler error: in fold_convert_loc, at fold-const.c:2402)

PR sanitizer/85213
* fold-const.c (twoval_comparison_p): Remove SAVE_P argument and don't
look through SAVE_EXPRs with non-side-effects argument.  Adjust
recursive calls.
(fold_comparison): Adjust twoval_comparison_p caller, don't handle
save_p here.

* c-c++-common/ubsan/pr85213.c: New test.

From-SVN: r259167

re PR rtl-optimization/85180 (Infinite loop in RTL DSE optimizer)

2018-04-06  Richard Biener  <rguenther@suse.de>

PR middle-end/85180
* alias.c (find_base_term): New wrapper around find_base_term
unwinding CSELIB_VAL_PTR changes.
(find_base_term): Do not restore CSELIB_VAL_PTR during the
recursion.

* gcc.dg/pr85180.c: New testcase.

From-SVN: r259166

IBM Z: Fix vcond-shift testcase.

gcc/testsuite/ChangeLog:

2018-04-06  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

* gcc.target/s390/vector/vcond-shift.c: Use the proper conditions
to trigger the optimization. Do some cleanup and function
renaming.  Add more test functions.

From-SVN: r259165

IBM Z: Use the dedicated NOP instructions for "nop"

We still use lr r0,r0 as a NOP instruction although we have some kind
of dedicated NOP instruction (nopr) which maps to a "branch never".

As a side-effect this fixes testcases scanning for NOPs
e.g. patchable_function_entry-*.

As another side-effect this makes it difficult to distingiush NOPs
generated for hotpatching from NOPs added when using -O0 to attach
location information to it.  Hence I had to make sure that the hotpatch
testcases get skipped when compiling without optimization.

gcc/ChangeLog:

2018-04-06  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

* config/s390/s390.c (s390_z10_optimize_cmp): Expand dedicated NOP
instructions.
* config/s390/s390.md (UNSPECV_NOP_LR_0, UNSPECV_NOP_LR_1): New
constant definitions.
("nop"): lr 0,0 -> nopr r0
("nop_lr0", "nop_lr1"): New insn definitions.

gcc/testsuite/ChangeLog:

2018-04-06  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

* gcc.target/s390/s390.exp: Remove -O0 from list of torture
options.
* gcc.target/s390/hotpatch-1.c: Skip when building without
optimization.
* gcc.target/s390/hotpatch-10.c: Likewise.
* gcc.target/s390/hotpatch-11.c: Likewise.
* gcc.target/s390/hotpatch-12.c: Likewise.
* gcc.target/s390/hotpatch-13.c: Likewise.
* gcc.target/s390/hotpatch-14.c: Likewise.
* gcc.target/s390/hotpatch-15.c: Likewise.
* gcc.target/s390/hotpatch-16.c: Likewise.
* gcc.target/s390/hotpatch-17.c: Likewise.
* gcc.target/s390/hotpatch-18.c: Likewise.
* gcc.target/s390/hotpatch-19.c: Likewise.
* gcc.target/s390/hotpatch-2.c: Likewise.
* gcc.target/s390/hotpatch-3.c: Likewise.
* gcc.target/s390/hotpatch-4.c: Likewise.
* gcc.target/s390/hotpatch-5.c: Likewise.
* gcc.target/s390/hotpatch-6.c: Likewise.
* gcc.target/s390/hotpatch-7.c: Likewise.
* gcc.target/s390/hotpatch-8.c: Likewise.
* gcc.target/s390/hotpatch-9.c: Likewise.

From-SVN: r259164

Wattributes.c testcase: Disable warning check for IBM Z.

On IBM Z we enforce function alignment to 8 bytes.  Hence we get an
error instead of a warning when trying to specify smaller alignments.

gcc/testsuite/ChangeLog:

2018-04-06  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

* c-c++-common/Wattributes.c: Disable warning for s390* target and
check for an error instead.
* gcc.dg/Wattributes-6.c: Likewise.

From-SVN: r259163

[NDS32] Refine condition of stack_push and stack_pop patterns.

gcc/
* config/nds32/nds32.md (*stack_push, *stack_pop): Use
NDS32_V3PUSH_AVAILABLE_P macro.

From-SVN: r259162