Reimplement how prologue and epilogue is emitted to accomodate
enter/leave instructions, as well as improving the size of the
existing techinques.

The following modifications are added:

- millicode thunk calls can be now selected regardless of the
  optimization level. However they are enabled for size optimizations
  by default.  Also, the millicode optimization is turned off when we
  compile for long jumps.

- the compiler is able to use enter/leave instructions for prologue
  and epilogue. As these instructions are not ABI compatible we gurad
  them under a switch (i.e., -mcode-density-frame). When this option
  is on, the compiler will try emitting enter/leave instructions, if
  not, then millicode thunk calls (if enabled), and latter the regular
  push/pop instructions.

- The prologue/epilogue is now optimized to use pointer walks, hence
  improving the chance to have push_s/pop_s instructions emitted. It
  also tries to combine the stack adjustments with load/store
  operations.

gcc/
xxxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

        * common/config/arc/arc-common.c (arc_option_optimization_table):
        Millicode optimization is default on for size optimizations.
        * config/arc/arc-protos.h (arc_check_multi): New function.
        * config/arc/arc.c (RTX_OK_FOR_OFFSET_P): Rearange.
        (ENTER_LEAVE_START_REG): Define.
        (ENTER_LEAVE_END_REG): Likewise.
        (arc_override_options): Disable millicode when long calls option
        is on.
        (arc_frame_info): Change it from int to bool.
        (arc_compute_frame_size): Clean up.
        (arc_save_restore): Remove.
        (frame_save_reg): New function.
        (frame_restore_reg): Likewise.
        (arc_enter_leave_p): Likewise.
        (arc_save_callee_saves): Likewise.
        (arc_restore_callee_saves): Likewise.
        (arc_save_callee_enter): Likewise.
        (arc_restore_callee_leave): Likewise.
        (arc_save_callee_milli): Likewise.
        (arc_restore_callee_milli): Likewise.
        (arc_expand_prologue): Reimplement to emit enter/leave
        instructions.
        (arc_expand_epilogue): Likewise.
        (arc_check_multi): New function.
        * config/arc/arc.md (push_multi_fp): New pattern.
        (push_multi_fp_blink): Likewise.
        (pop_multi_fp): Likewise.
        (pop_multi_fp_blink): Likewise.
        (pop_multi_fp_ret): Likewise.
        (pop_multi_fp_blink_ret): Likewise.
        * config/arc/arc.opt (mmillicode): Update option.
        (mcode-density-frame): New option.
        * config/arc/predicates.md (push_multi_operand): New predicate.
        (pop_multi_operand): Likewise.
        * doc/invoke.texi (ARC): Update ARC options information.

gcc/testsuite
xxxxx-xx-xx  Claudiu Zissulescu  <claziss@synopsys.com>

        * gcc.target/arc/firq-1.c: Update test.
        * gcc.target/arc/firq-3.c: Likewise.
        * gcc.target/arc/firq-4.c: Likewise.
        * gcc.target/arc/interrupt-6.c: Likewise.

From-SVN: r266065

Simple peephole rules which combines multiple ld/st instructions into
64-bit load/store instructions. It only works for architectures which
are having double load/store option on.

gcc/
	Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc-protos.h (gen_operands_ldd_std): Add.
	* config/arc/arc.c (operands_ok_ldd_std): New function.
	(mem_ok_for_ldd_std): Likewise.
	(gen_operands_ldd_std): Likewise.
	* config/arc/arc.md: Add peephole2 rules for std/ldd.

From-SVN: r266064

	* toplev.c (output_stack_usage): Turn test on flag_stack_usage into
	test on stack_usage_file.
	(lang_dependent_init): Do not open the .su file if generating LTO.

From-SVN: r266063

re PR rtl-optimization/87918 (ICE in simplify_binary_operation, at simplify-rtx.c:2153 since r264688)

	PR rtl-optimization/87918
	* simplify-rtx.c (simplify_merge_mask): For COMPARISON_P, use
	simplify_gen_relational rather than simplify_gen_binary.

	* gcc.target/i386/pr87918.c: New test.

From-SVN: r266062

2018-11-13  Richard Biener  <rguenther@suse.de>

	* tree-ssanames.h (set_range_info): Use value_range_base.
	(get_range_info): Likewise.
	* tree-ssanames.c (set_range_info): Likewise.
	(get_range_info): Likewise.
	* tree-vrp.c (value_range_base::union_helper): Split
	out common parts of value_range[_base]::union_.
	(value_range_base::union_): Update.
	(value_range::union_): Likewise.
	(determine_value_range_1): Use value_range_base.
	(determine_value_range): Likewise.
	* tree-vrp.h (value_range_base::union_helper): Move ...
	(value_range::union_helper): ... from here.

From-SVN: r266061

2018-11-13  Xianmiao Qu  <xianmiao_qu@c-sky.com>

	libgcc/
	* config/csky/linux-unwind.h (_sig_ucontext_t): Remove.
	(csky_fallback_frame_state): Modify the check of the 
	instructions to adapt to changes in the kernel

From-SVN: r266060

	* gcc-interface/misc.c (gnat_init_gcc_eh): Set -fnon-call-exceptions
	for the runtime on platforms where System.Machine_Overflow is true.

From-SVN: r266057

When lambdas were added in C++11 they were banned from unevaluated contexts
as a way to avoid needing to deal with them in mangling or SFINAE.  This
proposal avoids that with a more narrow proposal: lambdas never compare as
equivalent (so we don't need to mangle them), and substitution failures
within a lambda are hard errors.  Lambdas appearing in places that types
couldn't previously have been declared introduces various complications; in
particular, it seems likely to mean types with no linkage being used more
broadly, risking ODR violations.  I want to follow up this patch with some
related diagnostics.

	* decl2.c (min_vis_expr_r): Handle LAMBDA_EXPR.
	* mangle.c (write_expression): Handle LAMBDA_EXPR.
	* parser.c (cp_parser_lambda_expression): Allow lambdas in
	unevaluated context.  Start the tentative firewall sooner.
	(cp_parser_lambda_body): Use cp_evaluated.
	* pt.c (iterative_hash_template_arg): Handle LAMBDA_EXPR.
	(tsubst_function_decl): Substitute a lambda even if it isn't
	dependent.
	(tsubst_lambda_expr): Use cp_evaluated.  Always complain.
	(tsubst_copy_and_build) [LAMBDA_EXPR]: Do nothing if tf_partial.
	* semantics.c (begin_class_definition): Allow in template parm list.
	* tree.c (strip_typedefs_expr): Pass through LAMBDA_EXPR.
	(cp_tree_equal): Handle LAMBDA_EXPR.

From-SVN: r266056

Previously, when we got a function template with explicit arguments for all
of the template parameters, we still did "deduction", which of course
couldn't deduce anything, but did other deduction-time checking of
non-dependent conversions and such.  This broke down with the unevaluated
lambdas patch (to follow): substituting into the lambda multiple times, once
to get the function type for deduction and then again to generate the actual
decl, doesn't work, since different substitutions of a lambda produce
different types.  I believe that skipping the initial substitution when we
have all the arguments is still conformant, and produces better diagnostics
for some testcases.

	* pt.c (fn_type_unification): If we have a full set of explicit
	arguments, go straight to substitution.

From-SVN: r266055

	* decl2.c (min_vis_expr_r, expr_visibility): New.

We weren't properly constraining visibility based on names that appear in
the mangled representation of expressions.  This was made more obvious
by the upcoming unevaluated lambdas patch.

	(min_vis_r): Call expr_visibility.
	(constrain_visibility_for_template): Likewise.

From-SVN: r266054

A destroying operator delete takes responsibility for calling the destructor
for the object it is deleting; this is intended to be useful for sized
delete of a class allocated with a trailing buffer, where the compiler can't
know the size of the allocation, and so would pass the wrong size to the
non-destroying sized operator delete.

gcc/c-family/
	* c-cppbuiltin.c (c_cpp_builtins): Define
	__cpp_impl_destroying_delete.
gcc/cp/
	* call.c (std_destroying_delete_t_p, destroying_delete_p): New.
	(aligned_deallocation_fn_p, usual_deallocation_fn_p): Use
	destroying_delete_p.
	(build_op_delete_call): Handle destroying delete.
	* decl2.c (coerce_delete_type): Handle destroying delete.
	* init.c (build_delete): Don't call dtor with destroying delete.
	* optimize.c (build_delete_destructor_body): Likewise.
libstdc++-v3/
	* libsupc++/new (std::destroying_delete_t): New.

From-SVN: r266053

Mostly this was straightforward; the tricky bit was finding, in the
instantiation, the set of capture proxies built when instantiating the
init-capture.  The comment in lookup_init_capture_pack goes into detail.

	* parser.c (cp_parser_lambda_introducer): Parse pack init-capture.
	* pt.c (tsubst_pack_expansion): Handle init-capture packs.
	(lookup_init_capture_pack): New.
	(tsubst_expr) [DECL_EXPR]: Use it.
	(tsubst_lambda_expr): Remember field pack expansions for
	init-captures.

From-SVN: r266052

	* cp-tree.h (struct cp_evaluated): New.

This patch simplifies the saving/clearing/restoring of
cp_unevaluated_operand and c_inhibit_evaluation_warnings in the presence of
mid-block returns.

	* init.c (get_nsdmi): Use it.
	* parser.c (cp_parser_enclosed_template_argument_list): Use it.
	* pt.c (coerce_template_parms, tsubst_aggr_type): Use it.

From-SVN: r266051

People objected to the old macro name as unclear, so it was changed.

	* c-cppbuiltin.c (c_cpp_builtins): Change __cpp_explicit_bool to
	__cpp_conditional_explicit.

From-SVN: r266050

This patch removes a call only necessary when using reload.  It also
corrects a PRE_DEC address offset.

	* config/rs6000/rs6000.c (rs6000_secondary_reload_inner): Negate
	offset for PRE_DEC.
	(rs6000_secondary_reload_gpr): Don't call find_replacement.

From-SVN: r266049

re PR middle-end/59634 (Documentation (info/man page): lack of information for cache size parameters (--param))

2018-11-13  Sandra Loosemore  <sandra@codesourcery.com>

	PR middle-end/59634

	gcc/
	* doc/invoke.texi (Optimize Options): Clarify that the
	l1-cache-line-size, l1-cache-size, and l2-cache-size parameters
	apply to data cache size.

From-SVN: r266048

	* config/rs6000/rs6000.c (rs6000_emit_prologue): Comment fix.

From-SVN: r266047

The testcase exercises one of the rotate patterns.

gcc/
	* config/rs6000/predicates.md (logical_const_operand),
	(logical_operand): Correct comment.
gcc/testsuite/
	* gcc.target/powerpc/rotmask.c: New.

From-SVN: r266046

	* config/rs6000/rs6000.md (addsi3_high): Prefix with '*'.

From-SVN: r266045

This catches a few places where move insn patterns don't slightly
disparage CTR, LR and VRSAVE regs.  Also fixes the doc for the rs6000
h constraint, and removes an r->cl alternative covered by r->h.

	* gcc/doc/md.texi (Machine Constraints): Correct rs6000 h constraint
	description.
	* config/rs6000/rs6000.md (movsi_internal1): Delete MT%0 case
	covered by alternative.
	(movcc_internal1): Ignore h for register preference.
	(mov<mode>_hardfloat64): Likewise.
	(mov<mode>_softfloat): Ignore c, l, h for register preference.

From-SVN: r266044

2018-11-12  Sandra Loosemore  <sandra@codesourcery.com>

	PR preprocessor/47823

	gcc/
	* doc/cpp.texi (Alternatives to Wrapper #ifndef): Move #pragma once
	documentation to...
	(Pragmas): ...here.  
	* doc/extend.texi (Pragmas): Note additional pragmas documented
	in the CPP manual.

From-SVN: r266043

From-SVN: r266042

gcc/ChangeLog:

2018-11-13  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/86677
	PR middle-end/87528
	* tree-scalar-evolution.c (expression_expensive_p): Make BUILTIN POPCOUNT
	as expensive when backend does not define it.

gcc/testsuite/ChangeLog:

2018-11-13  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR middle-end/86677
	PR middle-end/87528
	* g++.dg/tree-ssa/pr86544.C: Run only for target supporting popcount
	pattern.
	* gcc.dg/tree-ssa/popcount.c: Likewise.
	* gcc.dg/tree-ssa/popcount2.c: Likewise.
	* gcc.dg/tree-ssa/popcount3.c: Likewise.
	* gcc.target/aarch64/popcount4.c: New test.
	* lib/target-supports.exp (check_effective_target_popcountl): New.

From-SVN: r266039

The Linux kernel requires and emulates LL and SC for the R5900 too.  The
special --without-llsc default for the R5900 is therefore not applicable
in that case.

Reviewed-by: Maciej W. Rozycki <macro@linux-mips.org>

2018-11-12  Fredrik Noring  <noring@nocrew.org>

	gcc/
	* config.gcc: Update with-llsc defaults for MIPS r5900.

From-SVN: r266038

2018-11-12  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/87442
	* common.opt: Add -fprofile-filter-files and -fprofile-exclude-files
	options.
	* doc/invoke.texi: Document them.
	* tree-profile.c (parse_profile_filter): New.
	(parse_profile_file_filtering): Likewise.
	(release_profile_file_filtering): Likewise.
	(include_source_file_for_profile): Likewise.
	(tree_profiling): Filter source files based on the
	newly added options.
2018-11-12  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/87442
	* gcc.dg/profile-filtering-1.c: New test.
	* gcc.dg/profile-filtering-2.c: New test.

From-SVN: r266037

2018-11-12  Martin Liska  <mliska@suse.cz>

	PR target/87903
	* doc/extend.texi: Add missing values for __builtin_cpu_is and
	__builtin_cpu_supports for x86 target.

From-SVN: r266036

2018-11-12  Sandra Loosemore  <sandra@codesourcery.com>

	PR middle-end/21110

	gcc/
	* doc/rtl.texi (Constants): Clarify that mode of "high" doesn't
	have to be Pmode.
	(Arithmetic): Likewise for "lo_sum".

From-SVN: r266035

gcc/testsuite/ChangeLog:
	* gcc.dg/Wattribute-alias.c: Require ifunc support.

From-SVN: r266034

[PR87815]Don't generate shift sequence for load replacement in DSE when the mode size is not compile-time constant

The patch adds a check if the gap is compile-time constant.

This happens when dse decides to replace the load with previous store value.
The problem is that, shift sequence could not accept compile-time non-constant
mode operand.

gcc/

2018-11-12  Renlin Li  <renlin.li@arm.com>

	PR target/87815
	* dse.c (get_stored_val): Add check for compile-time
	constantness of gap.

gcc/testsuite/

2018-11-12  Renlin Li  <renlin.li@arm.com>

	PR target/87815
	* gcc.target/aarch64/sve/pr87815.c: New.

From-SVN: r266033

	PR libstdc++/87963
	* src/c++17/memory_resource.cc (chunk::_M_bytes): Change type from
	unsigned to uint32_t.
	(chunk): Fix static assertion for 64-bit targets that aren't LP64.
	(bigblock::all_ones): Fix undefined shift.

From-SVN: r266032

This patch adds -march=armv8.5-a to the Arm backend.
Armv8.5-A also adds two new security features:
- Speculation Barrier instruction
- Execution and Data Prediction Restriction Instructions
These are made optional to all older Armv8-A versions. Thus we are adding two
new options "+sb" and "+predres" to all older Armv8-A. These are passed on to
the assembler and have no code generation effects and have already gone in the
trunk of binutils.

*** gcc/ChangeLog ***

2018-11-12  Sudakshina Das  <sudi.das@arm.com>

	* config/arm/arm-cpus.in (armv8_5, sb, predres): New features.
	(ARMv8_5a): New fgroup.
	(armv8.5-a): New arch.
	(armv8-a, armv8.1-a, armv8.2-a, armv8.3-a, armv8.4-a): New options
	sb and predres.
	* config/arm/arm-tables.opt: Regenerate.
	* config/arm/t-aprofile: Add matching rules for -march=armv8.5-a
	* config/arm/t-arm-elf (all_v8_archs): Add armv8.5-a.
	* config/arm/t-multilib (v8_5_a_simd_variants): New variable.
	Add matching rules for -march=armv8.5-a and extensions.
	* doc/invoke.texi (ARM options): Document -march=armv8.5-a.
	Add sb and predres to all armv8-a except armv8.5-a.

*** gcc/testsuite/ChangeLog ***

2018-11-12  Sudakshina Das  <sudi.das@arm.com>

	* gcc.target/arm/multilib.exp: Add some -march=armv8.5-a
	combination tests.

From-SVN: r266031

	* tree-vrp.h (value_range[_base]::set): Make public.  Provide
	overload for single value.
	(value_range[_base]::set_nonnull): New.
	(value_range[_base]::set_null): Likewise.
	(value_range): Document bitmap copying behavior, mark
	copy constructor and assignment operator deleted.
	(value_range::move): New.
	(value_range::set_and_canonicalize): Default bitmap to zero.
	(set_value_range_to_nonnull): Remove.
	(set_value_range_to_null): Likewise.
	(set_value_range): Likewise.
	(set_value_range_to_value): Likewise.
	(extract_range_from_unary_expr): Work on value_range_base.
	(extract_range_from_binary_expr_1): Likewise.  Rename to...
	(extract_range_from_binary_expr): ... this.
	* tree-vrp.c (value_range::update): Clear equiv bitmap
	if required.
	(value_range::move): New, move equiv bitmap.
	(value_range_base::set_undefined): Avoid assignment.
	(value_range::set_undefined): Likewise.
	(value_range_base::set_varying): Likewise.
	(value_range::set_varying): Likewise.
	(set_value_range): Remove.
	(value_range_base::set): New overload for value.
	(value_range::set): Likewise.
	(set_value_range_to_nonnull): Remove.
	(value_range_base::set_nonnull): New.
	(value_range::set_nonnull): Likewise.
	(set_value_range_to_null): Remove.
	(value_range_base::set_null): New.
	(value_range::set_null): Likewise.
	(range_is_null): Work on value_range_base.
	(range_is_nonnull): Likewise.
	(ranges_from_anti_range): Likewise.
	(extract_range_into_wide_ints): Likewise.
	(extract_range_from_multiplicative_op): Likewise.
	(extract_range_from_binary_expr): Likewise.  Update for API changes.
	(extract_range_from_unary_expr): Likewise.  Remove OBJ_TYPE_REF
	handling.
	(value_range::intersect_helper): Avoid copy and assignment.
	(value_range::union_helper): Likewise.
	(determine_value_range_1): Adjust.
	* gimple-ssa-evrp-analyze.c (evrp_range_analyzer::try_find_new_range):
	Avoid assignment by using move.
	(evrp_range_analyzer::record_ranges_from_stmt): Avoid assignment.
	* tree-ssa-threadedge.c (record_temporary_equivalences_from_phis):
	Likewise.
	* tree-ssanames.c (get_range_info): Likewise.
	* vr-values.h (vr_values::get_vr_for_comparison): Adjust API.
	* vr-values.c (vr_values::get_value_range): Adjust.
	(vr_values::update_value_range): Likewise.
	(symbolic_range_based_on_p): Work on value_range_base.
	(vr_values::extract_range_from_binary_expr): Use value_range_base.
	(vr_values::extract_range_from_unary_expr): Likewise.
	(vr_values::extract_range_from_cond_expr): Avoid assignment.
	(vr_values::extract_range_from_comparison): Adjust.
	(vr_values::check_for_binary_op_overflow): Use value_range_base.
	(vr_values::extract_range_basic): Adjust.
	(vr_values::adjust_range_with_scev): Likewise.
	(vr_values::vrp_visit_assignment_or_call): Likewise.
	(vr_values::get_vr_for_comparison): Change API to avoid
	assignment and copy construction.
	(vr_values::compare_name_with_value): Adjust accordingly.
	(vr_values::compare_names): Likewise.
	(vr_values::extract_range_from_phi_node): Avoid assignment and
	bogus in-place modify of equiv bitmap.
	(vr_values::simplify_bit_ops_using_ranges): Use value_range_base.
	* ipa-prop.c (ipa_compute_jump_functions_for_edge): Adjust
	for extract_range_from_unary_expr API change.
	* ipa-cp.c (ipa_vr_operation_and_type_effects): Likewise.

From-SVN: r266030

From-SVN: r266029

2018-11-12  Richard Biener  <rguenther@suse.de>

	* tree-vrp.h (value_range_base::symbolic_p,
	value_range_base::constant_p, value_range_base::zero_p,
	value_range_base::singleton_p): Move from value_range.
	(value_range::dump): Add.
	* gimple-ssa-evrp-analyze.c
	(evrp_range_analyzer::record_ranges_from_phis): Use set_varying.
	* ipa-cp.c (ipcp_vr_lattice::print): Use dump_value_range.
	* tree-ssa-threadedge.c (record_temporary_equivalences_from_phis):
	Use set_varying.
	* tree-vrp.c (value_range::symbolic_p): Move to value_range_base.
	(value_range::constant_p): Likewise.
	(value_range::singleton_p): Likewise.
	(value_range_base::dump): Add.
	(set_value_range_to_undefined): Remove.
	(set_value_range_to_varying): Likewise.
	(range_int_cst_p): Take value_range_base argument.
	(range_int_cst_singleton_p): Likewise.
	(value_range_constant_singleton): Likewise.
	(vrp_set_zero_nonzero_bits): Likewise.
	(extract_range_from_multiplicative_op): Use set_varying.
	(extract_range_from_binary_expr_1): Likewise. Use set_undefined.
	(extract_range_from_unary_expr): Likewise.
	(dump_value_range_base): Change to overload of dump_value_range.
	(vrp_prop::vrp_initialize): Use set_varying and set_undefined.
	(vrp_prop::visit_stmt): Likewise.
	(value_range::intersect_helper): Likewise.
	(value_range::union_helper): Likewise.
	(determine_value_range_1): Likewise.

From-SVN: r266028

2018-11-12  Richard Biener  <rguenther@suse.de>

	* tree-vrp.c (set_value_range_to_nonnull): Clear equiv.
	(set_value_range_to_null): Likewise.
	* vr-values.c (vr_values::extract_range_from_comparison):
	Clear equiv for constant singleton ranges.

From-SVN: r266027

2018-11-12 Wei Xiao <wei3.xiao@intel.com>

        * config/i386/sse.md: Combine VFIXUPIMM* patterns
        (<avx512>_fixupimm<mode>_maskz<round_saeonly_expand_name>): Update.
        (<avx512>_fixupimm<mode><sd_maskz_name><round_saeonly_name>): Update.
        (<avx512>_fixupimm<mode>_mask<round_saeonly_name>): Remove.
        (avx512f_sfixupimm<mode>_maskz<round_saeonly_expand_name>): Update.
        (avx512f_sfixupimm<mode><sd_maskz_name><round_saeonly_name>): Update.
        (avx512f_sfixupimm<mode>_mask<round_saeonly_name>): Remove.

From-SVN: r266026

2018-11-11  Sandra Loosemore  <sandra@codesourcery.com>

	PR c/69502

	gcc/
	* doc/extend.texi (Common Type Attributes): For the align type
	attribute, copy language about decreasing alignment from the
	corresponding variable attribute.

From-SVN: r266025

2018-11-11  Xianmiao Qu  <xianmiao_qu@c-sky.com>

	gcc/
	* config/csky/csky.md (*fpuv2_nmulsf3_1, *fpuv2_nmuldf3_1): Handle
	-frounding-math.

	gcc/testsuite
	* gcc.target/csky/fnmul-1.c: New.
	* gcc.target/csky/fnmul-2.c: New.
	* gcc.target/csky/fnmul-3.c: New.
	* gcc.target/csky/fnmul-4.c: New.

From-SVN: r266024

From-SVN: r266023

2018-11-11  Sandra Loosemore  <sandra@codesourcery.com>

	PR c++/43105

	gcc/
	* doc/invoke.texi (C++ Dialect Options): Add warning about mixing
	-frtti and -fno-rtti code.

From-SVN: r266020