runtime: copy lfstack code from Go 1.7 runtime

    Note that lfstack_64bit.go was modified for Solaris support in a
    different, and better, way than the superseded lfstack.goc code.

    Reviewed-on: https://go-review.googlesource.com/31673

From-SVN: r241427

re PR c++/77656 (64-bit integral template parameter gets incorrectly sized as 32-bits)

PR c++/77656
* pt.c (convert_template_argument): Call convert_nontype_argument
on value-dependent but not type-dependent arguments.
(convert_nontype_argument): Handle value-dependent arguments.
(canonicalize_expr_argument): New.
(deducible_expression, unify): Skip CONVERT_EXPR.
* error.c (dump_template_argument): Likewise.
* mangle.c (write_expression): Likewise.

From-SVN: r241425

* ptree.c (cxx_print_xnode) [TEMPLATE_PARM_INDEX]: Dump the decl.

From-SVN: r241424

re PR libfortran/78055 (Many new gfortran test failures)

2016-10-21  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

PR libfortran/78055
* io/io.h (st_parameter_dt): Restore GFC_IO_INT to maintain
alignment.

From-SVN: r241422

Really add the test this time...

    testsuite/
* gcc.target/aarch64/test_frame_17.c: New test.

From-SVN: r241421

Improve stack adjustment by reusing a temporary move immediate from the epilog...

Improve stack adjustment by reusing a temporary move immediate from the epilog
if the register is still valid in the epilog.  This generates smaller code for
leaf functions with a stack size of more then 4KB.

gcc/
* config/aarch64/aarch64.c (aarch64_add_constant_internal):
Add extra argument to allow emitting the move immediate.
Use add/sub with positive immediate.
(aarch64_add_constant): Add inline function.
(aarch64_add_sp): Likewise.
(aarch64_sub_sp): Likewise.
(aarch64_expand_prologue): Call aarch64_sub_sp.
(aarch64_expand_epilogue): Call aarch64_add_sp.
Decide when to leave out move.
(aarch64_output_mi_thunk): Call aarch64_add_constant.

testsuite/
* gcc.target/aarch64/test_frame_17.c: New test.

From-SVN: r241420

If the number of integer callee-saves is odd, any FP callee-saves use 8-byte aligned LDP/STP.

If the number of integer callee-saves is odd, any FP callee-saves use 8-byte
aligned LDP/STP.  Since 16-byte alignment may be faster on some CPUs, align
the FP callee-saves to 16 bytes and use the alignment gap for the last FP
callee-save when possible.

    gcc/
        * config/aarch64/aarch64.c (aarch64_layout_frame):
        Align FP callee-saves.

From-SVN: r241419

LWG2720 implement filesystem::perms::symlink_nofollow

* include/experimental/bits/fs_fwd.h (perms::resolve_symlinks):
Replace with symlink_nofollow (LWG 2720).
* src/filesystem/ops.cc (permissions(const path&, perms, error_code&)):
Handle symlink_nofollow.
* testsuite/experimental/filesystem/operations/create_symlink.cc: New
test.
* testsuite/experimental/filesystem/operations/permissions.cc: Test
overload taking error_code.

From-SVN: r241418

LWG2725 Fix error reporting for filesystem::exists

* include/experimental/bits/fs_ops.h
(exists(const path&, error_code&)): Clear error if status is known
(LWG 2725).
(status(const path&, error_code&)): Handle EOVERFLOW.
* testsuite/experimental/filesystem/operations/exists.cc: Test
overload taking an error_code.

From-SVN: r241417

LWG2707 init filesystem::path from string_type&&

* include/experimental/bits/fs_path.h (path::path(string_type&&))
(path::operator=(string&&), path::assign(string_type&&)): Define
construction and assignment from string_type rvalues (LWG 2707).

From-SVN: r241416

re PR preprocessor/71681 (header.gcc file lookup is broken for -remap)

2016-10-21  Andris Pavenis  <andris.pavenis@iki.fi>

PR preprocessor/71681
* gcc.dg/cpp/pr71681-1.c: New testcase
* gcc.dg/cpp/pr71681-2.c: Likewise
* gcc.dg/cpp/remap/header.gcc: File for added test-cases
* gcc.dg/cpp/remap/a/header.gcc: Likewise
* gcc.dg/cpp/remap/a/t_1.h: Likewise
* gcc.dg/cpp/remap/a/t_2.h: Likewise

From-SVN: r241415

Optimize RNG use in std::sample selection sampling

2016-10-21  Eelis van der Weegen  <eelis@eelis.net>

* include/bits/stl_algo.h (__gen_two_uniform_ints): Move logic out
of shuffle into new function.
(shuffle): Call __gen_two_uniform_ints.
(__sample<ForwardIterator, OutputIterator, Cat, Size, URBG>): Use
__gen_two_uniform_ints and perform two samples at a time.

From-SVN: r241414

re PR preprocessor/71681 (header.gcc file lookup is broken for -remap)

2016-10-21  Andris Pavenis  <andris.pavenis@iki.fi>

PR preprocessor/71681
* files.c (remap_filename): Fix handling -remap in subdirectories.

From-SVN: r241413

adxintrin.h (_subborrow_u32, [...]): Formatting fixes.

* config/i386/adxintrin.h (_subborrow_u32, _addcarry_u32,
_addcarryx_u32, _subborrow_u64, _addcarry_u64, _addcarryx_u64):
Formatting fixes.
* config/i386/rdseedintrin.h (_rdseed16_step, _rdseed32_step,
_rdseed64_step): Likewise.
* config/i386/tbmintrin.h (__bextri_u32): Likewise.

From-SVN: r241412

re PR target/78057 (FAIL: gcc.target/i386/bmi-{4,5,6}.c)

PR target/78057
* config/i386/i386.c: Include fold-const-call.h, tree-vrp.h
and tree-ssanames.h.
(ix86_fold_builtin): Fold IX86_BUILTIN_[LT]ZCNT{16,32,64}
with INTEGER_CST argument.
(ix86_gimple_fold_builtin): New function.
(TARGET_GIMPLE_FOLD_BUILTIN): Define.

* gcc.target/i386/pr78057.c: New test.

From-SVN: r241411

Split <functional> into smaller pieces

* include/Makefile.am: Add <bits/refwrap.h> and <bits/std_function.h>.
Order alphabetically.
* include/Makefile.in: Regenerate.
* include/bits/refwrap.h: New header.
(_Maybe_get_result_type,_Weak_result_type_impl, _Weak_result_type)
(_Reference_wrapper_base_impl, _Reference_wrapper_base)
(reference_wrapper, ref, cref): Move here from <functional>.
* include/bits/shared_ptr_base.h: Include <bits/refwrap.h> and
<bits/stl_function.h> instead of <functional>.
* include/bits/std_function.h: New header.
(_Maybe_unary_or_binary_function, bad_function_call)
(__is_location_invariant, _Nocopy_types, _Any_data)
(_Simple_type_wrapper, _Function_base, _Function_handler, function):
Move here from <functional>.
* include/bits/unique_ptr.h: Include <bits/stl_function.h>.
* include/std/functional: Include new headers and move components to
them.
* include/std/future: Include <bits/std_function.h> instead of
<functional>.
* include/std/mutex: Likewise.
* include/std/regex: Likewise.
* src/c++11/compatibility-thread-c++0x.cc: Include <functional>.
* testsuite/20_util/default_delete/48631_neg.cc: Adjust dg-error line.
* testsuite/20_util/default_delete/void_neg.cc: Likewise.
* testsuite/20_util/unique_ptr/assign/48635_neg.cc: Adjust dg-error
lines.
* testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc: Likewise.
* testsuite/30_threads/packaged_task/49668.cc: Include <functional>.

From-SVN: r241410

dwarf2out.c (ranges_table): Change into vec<dw_ranges, va_gc> *.

* dwarf2out.c (ranges_table): Change into vec<dw_ranges, va_gc> *.
(ranges_by_label): Change into vec<dw_ranges_by_label, va_gc> *.
(ranges_table_allocated, ranges_table_in_use,
ranges_by_label_allocated, ranges_by_label_in_use,
RANGES_TABLE_INCREMENT): Removed.
(add_ranges_num): Use vec_safe_push into ranges_table.
(add_ranges_by_labels): Use vec_safe_push into ranges_by_label.
(output_ranges): Adjust for ranges_table and ranges_by_label
conversion from arrays to vec.
(add_high_low_attributes, dwarf2out_finish): Adjust for range_table
conversion from arrays to vec.
(dwarf2out_c_finalize): Don't clear ranges_table_allocated,
ranges_table_in_use, ranges_by_label_allocated and
ranges_by_label_in_use.  Set ranges_by_label to NULL instead of 0.

From-SVN: r241409

dwarf2out.c (gen_variable_die): Emit DW_AT_const_expr attribute if needed.

* dwarf2out.c (gen_variable_die): Emit DW_AT_const_expr attribute
if needed.  Re-add origin_die variable and its initialization.
cp/
* cp-objcp-common.c (cp_decl_dwarf_attribute): Handle
DW_AT_const_expr.
testsuite/
* g++.dg/debug/dwarf2/constexpr-var-1.C: New test.

From-SVN: r241408

gimplify.c (gimplify_bind_expr): Handle oacc_declare_returns even for -fstack-reuse=none, or for volatile vars etc.

* gimplify.c (gimplify_bind_expr): Handle oacc_declare_returns
even for -fstack-reuse=none, or for volatile vars etc.

From-SVN: r241407

Start adding selftests for print_rtx

gcc/ChangeLog:
* print-rtl-function.c (flag_compact): Move extern decl to...
* print-rtl.h (flag_compact): ...here.
* rtl-tests.c (selftests::assert_rtl_dump_eq): New function.
(ASSERT_RTL_DUMP_EQ): New macro.
(selftest::test_dumping_regs): New function.
(selftest::test_dumping_insns): New function.
(selftest::test_uncond_jump): Add uses of ASSERT_RTL_DUMP_EQ on
the insns.
(selftest::rtl_tests_c_tests): Call the new test functions.

From-SVN: r241405

Use global operator new in std::make_exception_ptr

* libsupc++/exception_ptr.h (make_exception_ptr): Qualify new.
* testsuite/18_support/exception_ptr/make_exception_ptr_2.cc: New
test.

From-SVN: r241404

re PR fortran/69566 ([OOP] Failure of SELECT TYPE with unlimited polymorphic function result)

2016-10-21  Paul Thomas  <pault@gcc.gnu.org>

PR fortran/69566
* resolve.c (fixup_array_ref): New function.
(resolve_select_type): Gather up the rank and array reference,
if any, from the selector. Fix up the 'associate name' and the
'associate entities' as necessary.
* trans-expr.c (gfc_conv_class_to_class): If the symbol backend
decl is a FUNCTION_DECL, use the 'fake_result_decl' instead.

2016-10-21  Paul Thomas  <pault@gcc.gnu.org>

PR fortran/69566
* gfortran.dg/select_type_37.f03: New test.

From-SVN: r241403

make tablejump_p return the label as a rtx_insn *

gcc/ChangeLog:

2016-10-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

* cfgcleanup.c (merge_blocks_move_successor_nojumps): Adjust.
(outgoing_edges_match): Likewise.
(try_crossjump_to_edge): Likewise.
* cfgrtl.c (try_redirect_by_replacing_jump): Likewise.
(rtl_tidy_fallthru_edge): Likewise.
* rtl.h (tablejump_p): Adjust prototype.
* rtlanal.c (tablejump_p): Return the label as a rtx_insn *.

From-SVN: r241402

make LABEL_REF_LABEL a rtx_insn *

While changing LABEL_REF_LABEL it might as well become an inline
function, so that its clearer what types are involved.  Unfortunately
because it is still possible to use XEXP and related macros on a
LABEL_REF rtx you can still set the field to be a non insn rtx.  The
other unfortunate thing is that the generators actually create LABEL_REF
rtx that refer to MATCH_x rtx, so there we actually need to use XEXP to
bypass the checking this patch adds.

gcc/ChangeLog:

2016-10-21  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

* rtl.h (label_ref_label): New function.
(set_label_ref_label): New function.
(LABEL_REF_LABEL): Delete.
* alias.c (rtx_equal_for_memref_p): Adjust.
* cfgbuild.c (make_edges): Likewise.
(purge_dead_tablejump_edges): Likewise.
* cfgexpand.c (convert_debug_memory_address): Likewise.
* cfgrtl.c (patch_jump_insn): Likewise.
* combine.c (distribute_notes): Likewise.
* cse.c (hash_rtx_cb): Likewise.
(exp_equiv_p): Likewise.
(fold_rtx): Likewise.
(check_for_label_ref): Likewise.
* cselib.c (rtx_equal_for_cselib_1): Likewise.
(cselib_hash_rtx): Likewise.
* emit-rtl.c (mark_label_nuses): Likewise.
* explow.c (convert_memory_address_addr_space_1): Likewise.
* final.c (output_asm_label): Likewise.
(output_addr_const): Likewise.
* gcse.c (add_label_notes): Likewise.
* genconfig.c (walk_insn_part): Likewise.
* genrecog.c (validate_pattern): Likewise.
* ifcvt.c (cond_exec_get_condition): Likewise.
(noce_emit_store_flag): Likewise.
(noce_get_alt_condition): Likewise.
(noce_get_condition): Likewise.
* jump.c (maybe_propagate_label_ref): Likewise.
(mark_jump_label_1): Likewise.
(redirect_exp_1): Likewise.
(rtx_renumbered_equal_p): Likewise.
* lra-constraints.c (operands_match_p): Likewise.
* print-rtl.c (print_value): Likewise.
* reload.c (find_reloads): Likewise.
* reload1.c (set_label_offsets): Likewise.
* reorg.c (get_branch_condition): Likewise.
* rtl-tests.c (test_uncond_jump): Likewise.
* rtl.c (rtx_equal_p_cb): Likewise.
(rtx_equal_p): Likewise.
* rtlanal.c (reg_mentioned_p): Likewise.
(rtx_referenced_p): Likewise.
(get_condition): Likewise.
* varasm.c (const_hash_1): Likewise.
(compare_constant): Likewise.
(const_rtx_hash_1): Likewise.
(output_constant_pool_1): Likewise.

From-SVN: r241401

Fix PR 71627 - unable to find a register to spill

Tweak find_valid_class_1 to consider a reg class if atleast one regno in
that class is ok.

Previously, even if no regno was in_hard_reg_set_p, the code goes ahead and
considers rclass as valid. bad was set only if a regno was in the reg
class *and* HARD_REGNO_MODE_OK was false - if both were false, bad wasn't
set and the reload got a wrong rclass. If that happened to be the best
one, this eventually lead to find_reg running out of registers to
spill, because the chosen rclass wouldn't have enough regs.

Also, it expected every regno in rclass to be valid for mode
i.e., if any regno fails HARD_REGNO_MODE_OK, it rejected the rclass. The
comments in the original commit for find_valid_class_1 say atleast one
regno is ok. This was updated to say "class which contains only
registers" when in_hard_reg_set_p was introduced in place of just
TEST_HARD_REG_BIT.

This commit fixes both of the above problems by not breaking out of the loop
on first unavailable regno. Instead, it computes the rclass size consisting
of all regnos in that class valid for the current mode.

If that computed size is zero, the rclass would be skipped, as it won't
beat best_size. Otherwise, the computed size is used to choose the best
rclass, instead of the static size from reg_class_size.

gcc/

2016-10-21  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>

PR target/71627
* reload.c (find_valid_class_1): Allow regclass if atleast one
regno in regclass is ok. Compute and use rclass size based on
actually available regnos for mode in rclass.

gcc/testsuite/

2016-10-21  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>

PR target/71627
* gcc.target/avr/pr71627.c: New test

From-SVN: r241400

MAINTAINERS: Update email address

* MAINTAINERS: Update email address

Co-Authored-By: Ulrich Weigand <uweigand@de.ibm.com>
From-SVN: r241399

tree-ssa-loop-split.c: Remove trailing spaces.

* tree-ssa-loop-split.c: Remove trailing spaces.
* match.pd: Likewise.

From-SVN: r241398

sparc-modes.def (CCV): New.

* config/sparc/sparc-modes.def (CCV): New.
(CCXV): Likewise.
* config/sparc/predicates.md (v_comparison_operator): New.
(icc_comparison_operator): Add support for CCV/CCXV.
(xcc_comparison_operator): Likewise.
* config/sparc/sparc.c (output_cbranch): Likewise.
(sparc_print_operand): Likewise.
* config/sparc/sparc.md (UNSPEC_{ADD,SUB,NEG}V): New constants.
(uaddvdi4): New expander.
(addvdi4): Likewise.
(uaddvdi4_sp32): New instruction.
(addvdi4_sp32): Likewise.
(uaddvsi4): New expander.
(addvsi4): Likewise.
(cmp_ccc_plus_sltu_set): New instruction.
(cmp_ccv_plus): Likewise.
(cmp_ccxv_plus): Likewise.
(cmp_ccv_plus_set): Likewise.
(cmp_ccxv_plus_set): Likewise.
(cmp_ccv_plus_sltu_set): Likewise.
(uaddvdi4): New expander.
(subvdi4): Likewise.
(usubdi4_sp32): New instruction.
(subvdi4_sp32): Likewise.
(usubvsi4): New expander.
(subvsi4): Likewise.
(cmpsi_minus_sltu_set): New instruction.
(cmp_ccv_minus): Likewise.
(cmp_ccxv_minus): Likewise.
(cmp_ccv_minus_set): Likewise.
(cmp_ccxv_minus_set): Likewise.
(cmp_ccv_minus_sltu_set): Likewise.
(unegvdi3): New expander.
(negvdi3): Likewise.
(unegdi3_sp32): New instruction.
(negvdi3_sp32): Likewise.
(unegvsi3): New expander.
(negvsi3): Likewise.
(cmp_ccc_neg_sltu_set): New instruction.
(cmp_ccv_neg): Likewise.
(cmp_ccxv_neg): Likewise.
(cmp_ccv_neg_set): Likewise.
(cmp_ccxv_neg_set): Likewise.
(cmp_ccv_neg_sltu_set): Likewise.

From-SVN: r241397

pure-code.exp: Require arm_cortex_m effective target.

2016-10-21  Andre Vieira  <andre.simoesdiasvieira@arm.com>

* gcc.target/arm/pure-code/pure-code.exp: Require arm_cortex_m
effective target.

From-SVN: r241396

[ree] PR rtl-optimization/78038: Handle global register dataflow definitions in ree

PR rtl-optimization/78038
* ree.c (get_defs): Return NULL if a defining insn for REG cannot
be deduced to set REG through the RTL structure.
(make_defs_and_copies_lists): Return false on a failing get_defs call.

* gcc.target/aarch64/pr78038.c: New test.

From-SVN: r241395

re PR c++/78051 (error: dead STMT in EH table when using -O2)

2016-10-21  Richard Biener  <rguenther@suse.de>

PR tree-optimization/78051
* tree-vrp.c (evrp_dom_walker::before_dom_children): Update stmt
and mark replaced if folding did something.

* g++.dg/torture/pr78051.C: New testcase.

From-SVN: r241394

rs6000.c (rs6000_assemble_visibility): Swap "internal" and "protected" in visibility types.

* config/rs6000/rs6000.c (rs6000_assemble_visibility): Swap "internal"
and "protected" in visibility types.
(rs6000_xcoff_declare_function_name): Fix formatting.
(rs6000_xcoff_declare_object_name): Fix formatting.

From-SVN: r241393

transfer.c (finalize_transfer): Free format data in child procedures.

2016-10-20  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

* io/transfer.c (finalize_transfer): Free format data in child
procedures. (st_read_done, st_write_done): Don't free format
hash table.

From-SVN: r241392

Daily bump.

From-SVN: r241391

array.c (gfc_match_array_constructor): Remove set, but unused variable.

2016-10-20  Steven G. Kargl  <kargl@gcc.gnu.org>

* array.c (gfc_match_array_constructor): Remove set, but unused
variable.

From-SVN: r241388

i386.c (ix86_fold_builtin): Handle IX86_BUILTIN_INFQ and IX86_BUILTIN_HUGE_VALQ here ...

* config/i386/i386.c (ix86_fold_builtin): Handle IX86_BUILTIN_INFQ
and IX86_BUILTIN_HUGE_VALQ here ...
(ix86_expand_builtin): ... not here.

From-SVN: r241387

wdate-time.c: Restored test case.

2016-10-20  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * c-c++-common/wdate-time.c: Restored test case.
        * g++.dg/warn/Wconversion-real.C: Deleted empty file.

From-SVN: r241385

runtime: rewrite interface code into Go

    I started to copy the Go 1.7 interface code, but the gc and gccgo
    representations of interfaces are too different.  So instead I rewrote
    the gccgo interface code from C to Go.  The code is largely the same as
    it was, but the names are more like those used in the gc runtime.

    I also copied over the string comparison functions, and tweaked the
    compiler to use eqstring when comparing strings for equality.

    Reviewed-on: https://go-review.googlesource.com/31591

From-SVN: r241384

* g++.dg/cpp1z/inline-var1.C (w): Initialize to 64 + 2.

From-SVN: r241383

* doc/gty.texi (for_user): Use @item next to @findex.

From-SVN: r241382

re PR target/78037 (Incorrect code generated at optimization level -O2 for tzcnt and binary and)

PR target/78037
* config/i386/bmiintrin.h (__tzcnt_u16): Call __builtin_ia32_tzcnt_u16.
(__tzcnt_u32, _tzcnt_u32): Call __builtin_ia32_tzcnt_u32.
(__tzcnt_u64, _tzcnt_u64): Call __builtin_ia32_tzcnt_u64.
* config/i386/lzcntintrin.h (__lzcnt_u16): Call
__builtin_ia32_lzcnt_u16.
(__lzcnt_u32, _lzcnt_u32): Call __builtin_ia32_lzcnt_u32.
(__lzcnt_u64, _lzcnt_u64): Call __builtin_ia32_lzcnt_u64.
* config/i386/i386.md (UNSPEC_LZCNT, UNSPEC_TZCNT): New unspecs.
(ctz<mode>2, *ctz<mode>2): Use SWI48 mode iterator.
(bmi_tzcnt_<mode>): New expander.
(*bmi_tzcnt_<mode>_falsedep_1): New define_insn_and_split pattern.
(*bmi_tzcnt_<mode>_falsedep, *bmi_tzcnt_<mode>): New insn patterns.
(clz<mode>2_lzcnt, *clz<mode>2_lzcnt): Use SWI48 mode iterator.
(lzcnt_<mode>): New expander.
(*lzcnt_<mode>_falsedep_1): New define_insn_and_split pattern.
(*lzcnt_<mode>_falsedep, *lzcnt_<mode>): New insn patterns.
* config/i386/i386-builtin-types.def (UINT_FTYPE_UINT): New.
(UINT64_FTYPE_UINT64): New.
* config/i386/i386-builtin.def (__builtin_clzs): Remove description.
(__builtin_ia32_lzcnt_u16): New description.
(__builtin_ia32_lzcnt_u32): Ditto.
(__builtin_ia32_lzcnt_u64): Ditto.
(__builtin_ctzs): Remove description.
(__builtin_ia32_tzcnt_u16): New description.
(__builtin_ia32_tzcnt_u32): Ditto.
(__builtin_ia32_tzcnt_u64): Ditto.
* config/i386/i386.c (ix86_expand_args_builtin): Handle
UINT_FTYPE_UINT and UINT64_FTYPE_UINT64.

testsuite/ChangeLog:

PR target/78037
* gcc.target/i386/pr78037.c: New test.

From-SVN: r241381

Do not fixup edges for a thunk in LTRANS (PR lto/78049)

PR lto/78049
* lto-streamer-in.c (fixup_call_stmt_edges_1): Replace value
comparison with STMT_UID_NOT_IN_RANGE.
(fixup_call_stmt_edges): Do not fixup edges of a thunk in
LTRANS.

From-SVN: r241380

compare-elim.c (conforming_compare): Accept UNSPECs.

* compare-elim.c (conforming_compare): Accept UNSPECs.
(find_comparison_dom_walker::before_dom_children): Deal with
instructions both using and killing the flags register.
(equivalent_reg_at_start): New function extracted from...
(try_eliminate_compare): ...here.  Use it and add support for
registers and UNSPECs as second operand of the compare.
* config/visium/visium-modes.def (CCV): New.
* config/visium/predicates.md (visium_v_comparison_operator): New.
(visium_branch_operator): Deal with CCV mode.
* config/visium/visium.c (visium_select_cc_mode): Likewise.
(output_cbranch): Likewise.
* config/visium/visium.md (UNSPEC_{ADD,SUB,NEG}V): New constants.
(uaddv<mode>4): New expander.
(addv<mode>4): Likewise.
(add<mode>3_insn_set_carry): New instruction.
(add<mode>3_insn_set_overflow): Likewise.
(addsi3_insn_set_overflow): Likewise.
(usubv<mode>4): New expander.
(subv<mode>4): Likewise.
(sub<mode>3_insn_set_carry): New instruction.
(sub<mode>3_insn_set_overflow): Likewise.
(subsi3_insn_set_overflow): Likewise.
(unegv<mode>3): New expander.
(negv<mode>3): Likewise.
(neg<mode>2_insn_set_overflow): New instruction.
(addv_tst<mode>): Likewise.
(subv_tst<mode>): Likewise.
(negv_tst<mode>): Likewise.
(cbranch<mode>4_addv_insn): New splitter and instruction.
(cbranch<mode>4_subv_insn): Likewise.
(cbranch<mode>4_negv_insn): Likewise.

From-SVN: r241379

tree-ssa-alias.c (ptrs_compare_unequal): Remove code duplication.

2016-10-20  Richard Biener  <rguenther@suse.de>

* tree-ssa-alias.c (ptrs_compare_unequal): Remove code duplication.
Handle decls possibly not bound.
* tree-ssa-structalias.c (get_constraint_for_ssa_var): Add
nothing_id for decls that might not be bound if we are interested
for the address.
(get_constraint_for_component_ref): Deal with that.

From-SVN: r241378

c-common.c (c_common_truthvalue_conversion): Fix the comment.

2016-10-20  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * c-common.c (c_common_truthvalue_conversion): Fix the comment.

From-SVN: r241377

* c-cppbuiltin.c (c_cpp_builtins): Update __cpp_concepts value.

From-SVN: r241376

* g++.dg/cpp1z/aligned-new7.C: Fix for small MAX_STACK_ALIGNMENT targets.

From-SVN: r241375

loop splitting

(approved at https://gcc.gnu.org/ml/gcc-patches/2015-12/msg00648.html )

* common.opt (-fsplit-loops): New flag.
* passes.def (pass_loop_split): Add.
* opts.c (default_options_table): Add OPT_fsplit_loops entry at -O3.
(enable_fdo_optimizations): Add loop splitting.
* timevar.def (TV_LOOP_SPLIT): Add.
* tree-pass.h (make_pass_loop_split): Declare.
* tree-ssa-loop-manip.h (rewrite_into_loop_closed_ssa_1): Declare.
* tree-ssa-loop-unswitch.c: Include tree-ssa-loop-manip.h,
* tree-ssa-loop-split.c: New file.
* Makefile.in (OBJS): Add tree-ssa-loop-split.o.
* doc/invoke.texi (fsplit-loops): Document.
* doc/passes.texi (Loop optimization): Add paragraph about loop
splitting.

testsuite/
* gcc.dg/loop-split.c: New test.
* gcc.dg/tree-ssa/ifc-9.c: Update.
* gcc.dg/tree-ssa/ifc-10.c: Update.

From-SVN: r241374

Prepare shared_ptr for array support

* include/backward/auto_ptr.h (__shared_ptr(auto_ptr&&))
(shared_ptr(auto_ptr&&)): Adjust template parameter lists.
* include/bits/shared_ptr.h (__sp_compatible_with)
(__sp_is_constructible): New helper traits for shared_ptr.
(shared_ptr::_Convertible): Replace with _Constructible.
(shared_ptr::_Constructible, shared_ptr::_Assignable): Forward checks
to base class.
(shared_ptr::shared_ptr, shared_ptr::operator=): Constrain template
with _Constructible and _Assignable.
(shared_ptr::shared_ptr(shared_ptr<_Tp1>, _Tp*)): Use element_type
instead of _Tp.
(operator<): Likewise.
(operator>): Define in terms of operator<.
(static_pointer_cast, const_pointer_cast, dynamic_pointer_cast): Use
element_type instead of _Tp.
(reinterpret_pointer_cast): Define for C++17.
(weak_ptr::_Convertible): Replace with _Constructible.
(weak_ptr::_Constructible, weak_ptr::_Assignable): Forward checks
to base class.
(weak_ptr::weak_ptr, weak_ptr::operator=): Constrain templates
with _Constructible and _Assignable.
* include/bits/shared_ptr_base.h (__shared_ptr::_Convertible): Replace
with _Compatible.
(__shared_ptr::_SafeConv): New constraint for incoming raw pointers.
(__shared_ptr::_Compatible): New constraint for converting from
other types of shared_ptr and weak_ptr.
(__shared_ptr::_Assignable): Define in terms of _Compatible.
(__shared_ptr::_UniqCompatible, __shared_ptr::_UniqAssignable): New
constraints for converting from unique_ptr.
(__shared_ptr::__shared_ptr, __shared_ptr::operator=): Constrain
template with _SaveConf, _Compatible and _Assignable. Remove
__glibcxx_function_requires concept checks. Add static assertion for
deleter expression being well-formed.
(__shared_ptr::__shared_ptr(__shared_ptr<_Tp1>, _Tp*))
(__shared_ptr::operator*, __shared_ptr::operator->)
(__shared_ptr::get, __shared_ptr::_M_ptr): Use element_type instead
of _Tp.
(operator<): Likewise.
(operator>): Define in terms of operator<.
(static_pointer_cast, const_pointer_cast, dynamic_pointer_cast): Use
element_type instead of _Tp.
(reinterpret_pointer_cast): Define for C++17.
(weak_ptr::_Convertible): Replace with _Compatible.
(weak_ptr::_Compatible, weak_ptr::_Assignable): New constraints for
conversions from other types of weak_ptr and shared_ptr.
(__weak_ptr::__weak_ptr, __weak_ptr::operator=): Constrain templates
with _Constructible and _Assignable.
(__weak_ptr::_M_ptr): Use element_type instead of _Tp.
* testsuite/20_util/shared_ptr/assign/auto_ptr_neg.cc: Adjust
dg-error pattern.
* testsuite/20_util/shared_ptr/cons/auto_ptr.cc: Test conversions.
* testsuite/20_util/shared_ptr/cons/unique_ptr.cc: Likewise.
* testsuite/20_util/shared_ptr/cons/void_neg.cc: Likewise.
* testsuite/20_util/shared_ptr/casts/reinterpret.cc: New test.

From-SVN: r241373

Do the operator= SFINAE in the return type for optional,

not in the template parameters.
* include/std/optional (operator=(_Up&&)): Move SFINAE
from template parameters to the return type.
(operator=(const optional<_Up>&)): Likewise.
(operator=(optional<_Up>&&)): Likewise.

From-SVN: r241372

Tweak whitespace in std::allocator files

* include/bits/allocator.h: Remove trailing whitespace, tab-indent.
* include/ext/new_allocator.h: Likewise.

From-SVN: r241371

Makefile (x86-64/Linux): Restore missing pairs.

* gcc-interface/Makefile (x86-64/Linux): Restore missing pairs.
(x86/Darwin): Likewise.

From-SVN: r241369

class.c (gfc_build_class_symbol): Set the kind of _len to gfc_charlen_int_kind to catch changes of the charlen kind.

gcc/fortran/ChangeLog:

2016-10-20  Andre Vehreschild  <vehre@gcc.gnu.org>

* class.c (gfc_build_class_symbol): Set the kind of _len to
gfc_charlen_int_kind to catch changes of the charlen kind.

From-SVN: r241367

pr35356-1.c: Update.

2016-10-20  Richard Biener  <rguenther@suse.de>

* gcc.dg/graphite/pr35356-1.c: Update.

From-SVN: r241366

PR78052 Define std::allocator<void>::{construct,destroy}

PR libstdc++/78052
* include/bits/allocator.h (allocator<void>::construct)
(allocator<void>::destroy): Define.
* testsuite/20_util/allocator/void.cc: New test.

From-SVN: r241365

Add more tests for enable_shared_from_this ambiguities

* testsuite/20_util/enable_shared_from_this/56383.cc: Add tests for
additional ambiguous cases.

From-SVN: r241364

cgraphunit.c (analyze_functions): Set node->definition to false to signal symbol removal to...

2016-10-20  Richard Biener  <rguenther@suse.de>

* cgraphunit.c (analyze_functions): Set node->definition to
false to signal symbol removal to debug_hooks->late_global_decl.
* ipa.c (symbol_table::remove_unreachable_nodes): When not in
WPA signal symbol removal to the debuginfo machinery.
* dwarf2out.c (dwarf2out_late_global_decl): Instead of
using early_finised to guard the we're called for symbol
removal case look at the symtabs definition flag.
(gen_variable_die): Remove redundant check.

From-SVN: r241363

S/390: Add fallthrough comment in md file.

gcc/ChangeLog:

2016-10-20  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

* config/s390/s390.md ("prefetch"): Add fallthrough comment.

From-SVN: r241362

re PR c++/77446 (Suspicious "non-constant condition for static assertion" error)

2016-10-20  Paolo Carlini  <paolo.carlini@oracle.com>

PR c++/77446
* g++.dg/cpp1y/pr77446.C: New.

From-SVN: r241361

re PR tree-optimization/53979 (((a ^ b) | a) not optimized to (a | b))

2016-10-20  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

PR tree-optimization/53979
* match.pd ((a ^ b) | a -> a | b): New pattern.

testsuite/
* gcc.dg/pr53979-1.c: New test-case.
* gcc.dg/pr53979-2.c: Likewise.

From-SVN: r241360

Daily bump.

From-SVN: r241359

pa64-hpux-lib.h: New file.

libgcc/
* config/pa/pa64-hpux-lib.h: New file.
(EH_FRAME_SECTION_NAME): Rename to __LIBGCC_EH_FRAME_SECTION_NAME__.
(DTORS_SECTION_ASM_OP): Rename to __LIBGCC_DTORS_SECTION_ASM_OP__.
* config.host (tm_file): Add pa/pa64-hpux-lib.h to tm_file on
hppa*64*-*-hpux11*.
gcc/
* config/pa/pa64-hpux.h (PA_INIT_FRAME_DUMMY_ASM_OP): Move to
config/pa/pa64-hpux-lib.h.
(PA_CRTBEGIN_HACK): Likewise.
(DTOR_LIST_BEGIN): Likewise.

From-SVN: r241356

c-common.c (c_common_truthvalue_conversion): Warn only for signed integer shift ops in boolean context.

2016-10-19  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * c-common.c (c_common_truthvalue_conversion): Warn only for signed
        integer shift ops in boolean context.

testsuite:
2016-10-19  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * c-c++-common/Wint-in-bool-context-2.c: New test.

From-SVN: r241354

Make std::enable_shared_from_this cope with ambiguity

* include/backward/auto_ptr.h (__shared_ptr(auto_ptr&&)): Call
_M_enable_shared_from_this_with instead of
__enable_shared_from_this_helper.
* include/bits/shared_ptr.h (__enable_shared_from_this_helper):
Remove overload for std::enable_shared_from_this..
(__enable_shared_from_this_base): Define friend function to select a
std::enable_shared_from_this base class.
* include/bits/shared_ptr_base.h (__enable_shared_from_this_helper):
Remove all overloads.
(__shared_ptr): Change all relevant constructors to call
_M_enable_shared_from_this_with instead of
__enable_shared_from_this_helper.
(__shared_ptr::__efst_base_t, __shared_ptr::__has_efst_base): Helpers
to detect accessible and unambiguous enable_shared_from_this bases.
(__shared_ptr::_M_enable_shared_from_this_with): New function to
replace __enable_shared_from_this_helper overloads.
(__enable_shared_from_this_helper): Remove overload for
std::__enable_shared_from_this.
(__enable_shared_from_this_base): Define friend function to select a
std::__enable_shared_from_this base class.
* include/experimental/bits/shared_ptr.h (experimental::shared_ptr):
Change relevant constructors to call _M_enable_shared_from_this_with.
(experimental::shared_ptr::__efst_base_t)
(experimental::shared_ptr::__has_efst_base): Helpers to detect
accessible and unambiguous enable_shared_from_this bases.
(experimental::shared_ptr::_M_enable_shared_from_this_with): Define.
(experimental::__enable_shared_from_this_helper): Remove overload for
std::experimental::enable_shared_from_this.
(experimental::__expt_enable_shared_from_this_base): Define friend
function to select a std::experimental::enable_shared_from_this base.
* testsuite/experimental/memory/shared_ptr/cons/
enable_shared_from_this.cc: New test.
* testsuite/experimental/memory/shared_ptr/cons/unique_ptr_ctor.cc:
Adjust expected behaviour for shared_ptr<A[]>.

From-SVN: r241353

dtio_17.f90: Fix test.

2016-10-19  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

* gfortran.dg/dtio_17.f90: Fix test.

From-SVN: r241352

Walloca-1.c: Adjust test for !lp64 targets.

* gcc.dg/Walloca-1.c: Adjust test for !lp64 targets.
* gcc.dg/Walloca-2.c: Same.

From-SVN: r241351

Fix copy&paste error in __gnu_debug::vector

* include/debug/vector (__gnu_debug::vector::emplace_back): Fix return
type.

From-SVN: r241350

Fix incorrect comment about std::auto_ptr

* include/backward/auto_ptr.h (dauto_ptr): Correct comment about
conversions from auto_ptr<Derived> rvalues to auto_ptr<Base>.
* testsuite/20_util/auto_ptr/assign_neg.cc: Remove redundant dg-error
directives that only match notes, not errors.

From-SVN: r241349

arm.c (arm_emit_coreregs_64bit_shift): Clear the result register only if "in" and "out" are different registers.

2016-10-19  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * config/arm/arm.c (arm_emit_coreregs_64bit_shift): Clear the result
        register only if "in" and "out" are different registers.

From-SVN: r241348

runtime, syscall: force EPOLLET to be positive

    The C definition is 1U << 31.  Reportedly on some systems GCC's
    -fgo-dump-spec can print this as -2147483648.

    Reviewed-on: https://go-review.googlesource.com/31448

From-SVN: r241347

Wvla-1.c: Rename to...

* gcc.dg/Wvla-1.c: Rename to...
* gcc.dg/Wvla-larger-than-1.c: ...this.
* gcc.dg/Wvla-2.c: Rename to...
* gcc.dg/Wvla-larger-than-2.c: ...this.
* gcc.dg/Wvla-3.c: Rename to...
* gcc.dg/Walloca-11.c.: ...this.
* gcc.dg/wvla-[1-7].c: Rename to:
* gcc.dg/Wvla-[1-7].c: ...this.

From-SVN: r241344

omp-low.c (pass_oacc_device_lower::gate): New method.

* omp-low.c (pass_oacc_device_lower::gate): New method.
(execute): Always call execute_oacc_device_lower.

From-SVN: r241343

re PR tree-optimization/77916 (ICE in verify_gimple_in_cfg: invalid (pointer) operands to plus/minus)

2016-10-19  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

PR tree-optimization/77916
PR tree-optimization/77937
* gimple-ssa-strength-reduction.c (analyze_increments): Remove
stopgap fix.
(insert_initializers): Requirement of initializer for -1 should be
based on pointer-typedness of the candidate basis.

From-SVN: r241342

Test experimental::shared_ptr construction from other smart pointers

* testsuite/experimental/memory/shared_ptr/cons/unique_ptr_ctor.cc:
Add tests for valid and invalid conversions.
* testsuite/experimental/memory/shared_ptr/cons/weak_ptr_ctor.cc:
Likewise.

From-SVN: r241340

re PR tree-optimization/78005 (172.mgrid and 450.soplex miscompare)

PR tree-optimization/78005
* tree-vect-loop-manip.c (vect_gen_prolog_loop_niters): Compute
upper (included) bound for niters of prolog loop.
(vect_gen_scalar_loop_niters): Change parameter VF to VFM1.
Compute niters of scalar loop above which vectorized loop is
preferred, as well as the upper (included) bound for the niters.
(vect_do_peeling): Record niter bound for loops accordingly.

gcc/testsuite
PR tree-optimization/78005
* gcc.dg/vect/pr78005.c: New.
* gcc.target/i386/l_fma_float_1.c: Revise test.
* gcc.target/i386/l_fma_float_2.c: Ditto.
* gcc.target/i386/l_fma_float_3.c: Ditto.
* gcc.target/i386/l_fma_float_4.c: Ditto.
* gcc.target/i386/l_fma_float_5.c: Ditto.
* gcc.target/i386/l_fma_float_6.c: Ditto.
* gcc.target/i386/l_fma_double_1.c: Ditto.
* gcc.target/i386/l_fma_double_2.c: Ditto.
* gcc.target/i386/l_fma_double_3.c: Ditto.
* gcc.target/i386/l_fma_double_4.c: Ditto.
* gcc.target/i386/l_fma_double_5.c: Ditto.
* gcc.target/i386/l_fma_double_6.c: Ditto.

From-SVN: r241339

[PR lto/77458] Avoid ICE in offloading with differing _FloatN, _FloatNx types

gcc/
PR lto/77458
* tree-core.h (enum tree_index): Put the complex types after their
component types.
* tree-streamer.c (verify_common_node_recorded): New function.
(preload_common_nodes) <TREE_CODE (node) == COMPLEX_TYPE>: Use it.

From-SVN: r241338

Replace NULL with false as a return value

* cgraph.h (cgraph_edge::binds_to_current_def_p):
Replace NULL with false as a return value.

From-SVN: r241336

[PR tree-optimization/78024] Clear basic block flags before using BB_VISITED for OpenACC loops processing

gcc/
* omp-low.c (oacc_loop_discovery): Call clear_bb_flags before, and
don't clear BB_VISITED after processing.

gcc/testsuite/
* gcc.dg/goacc/loop-processing-1.c: New file.

From-SVN: r241334

Move negative unique_ptr tests to new file

* testsuite/20_util/unique_ptr/cons/cv_qual.cc: Move negative tests
to new file.
* testsuite/20_util/unique_ptr/cons/cv_qual_neg.cc: New file.  Fix
test for incompatible deleters to not also use incompatible types.
Add tests for incompatible array types.

From-SVN: r241332

Fix std::experimental::shared_ptr SFINAE constraints

* include/experimental/bits/shared_ptr.h
(__shared_ptr<__libfund_v1<_Tp, false>, _Lp>::_Compatible): Just use
is_convertible for non-array specialization.
(__shared_ptr<__libfund_v1<_Tp, false>, _Lp>::_UniqCompatible): New
constraint for conversions from unique_ptr.
(__shared_ptr<__libfund_v1<_Tp, false>, _Lp>::__shared_ptr): Constrain.
(__shared_ptr<__libfund_v1<_Tp, false>, _Lp>::reset): Likewise.
(__sp_compatible_v): New variable template for trait.
(__sp_is_constructible): New trait to check shared_ptr constraints.
(__sp_is_constructible_v): New variable template for trait.
(__shared_ptr<__libfund_v1<_Tp, true>, _Lp>::_SafeConv): New
constraint for construction/reset, using __sp_is_constructible_v.
(__shared_ptr<__libfund_v1<_Tp, true>, _Lp>::_UniqCompatible): New
constraint for conversions from unique_ptr.
(__shared_ptr<__libfund_v1<_Tp, true>, _Lp>::__shared_ptr): Constrain.
(__shared_ptr<__libfund_v1<_Tp, true>, _Lp>::reset): Likewise.
(shared_ptr::_SafeConv): Constraint for checking constructors.
(shared_ptr(Tp1*), shared_ptr(_Tp1, _Deleter))
(shared_ptr(_Tp1, _Deleter, _Alloc)): Constrain with _SafeConv.
(shared_ptr(const weak_ptr<_Tp1>&)): Constrain with _Compatible.
(shared_ptr(auto_ptr<_Tp1>&&)): Fix, remove TODO.
* testsuite/experimental/memory/shared_ptr/cons/pointer_ctor.cc:
Remove tests using invalid conversions.
* testsuite/experimental/memory/shared_ptr/cons/pointer_ctor_neg.cc:
New test.
* testsuite/experimental/memory/shared_ptr/cons/torture.cc: New test.
* testsuite/experimental/memory/shared_ptr/modifiers/reset.cc: Remove
tests using invalid conversions.
* testsuite/experimental/memory/shared_ptr/modifiers/reset_neg.cc: New
test.
* testsuite/experimental/memory/shared_ptr/observers/use_count.cc:
Remove tests using invalid conversions.

From-SVN: r241331

PR77990 refactor unique_ptr to encapsulate tuple

PR libstdc++/77990
* include/bits/unique_ptr.h (__uniq_ptr_impl): New type to
encapsulate implementation details.
(unique_ptr::unique_ptr(_Up)): Don't copy deleter object.
(unique_ptr::get, unique_ptr::get_deleter, unique_ptr::release):
Call member functions of implementation object.
(unique_ptr<T[], D>): Likewise.
* python/libstdcxx/v6/printers.py (UniquePointerPrinter): Adjust for
new implementation.
* python/libstdcxx/v6/xmethods.py (UniquePtrGetWorker): Likewise.
* testsuite/20_util/unique_ptr/assign/48635_neg.cc: Adjust dg-error
lines.
* testsuite/20_util/unique_ptr/assign/cv_qual.cc: Likewise.
* testsuite/20_util/unique_ptr/cons/cv_qual.cc: Likewise.
* testsuite/20_util/unique_ptr/cons/77990.cc: New test.

From-SVN: r241330

domwalk.c (dom_walker::walk): Use RPO order.

2016-10-19  Richard Biener  <rguenther@suse.de>

* domwalk.c (dom_walker::walk): Use RPO order.

From-SVN: r241329

system-linux-armel.ads: Rename into...

* system-linux-armel.ads: Rename into...
* system-linux-arm.ads: ...this
* gcc-interface/Makefile.in (ARM/Android): Adjust to above renaming.
(ARM/Linux): Likewise.
(Aarch64/Linux): Likewise.

From-SVN: r241328

tree-vrp.c (evrp_dom_walker::evrp_dom_walker): Initialize stmts_to_remove.

2016-10-19  Richard Biener  <rguenther@suse.de>

* tree-vrp.c (evrp_dom_walker::evrp_dom_walker): Initialize
stmts_to_remove.
(evrp_dom_walker::~evrp_dom_walker): Free it.
(evrp_dom_walker::stmts_to_remove): Add.
(evrp_dom_walker::before_dom_children): Mark PHIs and stmts
whose output we fully propagate for removal.  Propagate
into BB destination PHI arguments.
(execute_early_vrp): Remove queued stmts.  Dump value ranges
before stmt removal.

* gcc.dg/tree-ssa/pr61839_2.c: Fix testcase.

From-SVN: r241327

Daily bump.

From-SVN: r241326

Fix formatting.

From-SVN: r241322

Makefile.in (OBJS): Add gimple-ssa-warn-alloca.o.

* Makefile.in (OBJS): Add gimple-ssa-warn-alloca.o.
* passes.def: Add two instances of pass_walloca.
* tree-pass.h (make_pass_walloca): New.
* gimple-ssa-warn-walloca.c: New file.
* doc/invoke.texi: Document -Walloca, -Walloca-larger-than=, and
-Wvla-larger-than= options.

From-SVN: r241318

Makefile.in (EXTRA_GNATRTL_NONTASKING_OBJS): Define.

* gcc-interface/Makefile.in (EXTRA_GNATRTL_NONTASKING_OBJS): Define.
(EXTRA_GNATRTL_TASKING_OBJS): Likewise.
(ARM/Android): Add atomic support.
(SPARC/Solaris): Simplify.
(x86/Solaris): Likewise.
(x86/Linux): Likewise.
(x86-64/kFreeBDS): Adjust and use system-freebsd-x86.ads
(x86/FreeBSD): Add s-mudido-affinity.adb.
(x86-64/FreeBSD): Likewise and use system-freebsd-x86.ads.
(s390/Linux): Simplify.
(PowerPC/AIX): Likewise.
(Cygwin/Mingw): Likewise.
(MIPSel/Linux): Likewise.
(ARM/Linux): Add atomic support.
(Aarch64/Linux): Use system-linux-armel.ads.
(SPARC/Linux): Simplify.
(IA-64/Linux): Minor tweak.
(IA-64/HP-UX): Likewise.
(Alpha/Linux): Likewise.
(x86-64/Linux): Use system-linux-x86.ads.
(x86/Darwin): Simplify.
(PowerPC/Darwin): Likewise.
(ARM/Darwin): Use system-darwin-arm.ads.
(ADA_EXCLUDE_SRCS): Minor reformatting.
* system-aix.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
(Support_Atomic_Primitives): Set to True.
* system-aix64.ads: Delete.
* system-darwin-arm.ads: New.
* system-darwin-ppc.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
(Support_Atomic_Primitives): Set to True.
* system-darwin-ppc64.ads: New.
* system-darwin-x86.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
* system-darwin-x86_64.ads: Delete.
* system-freebsd-x86.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
* system-freebsd-x86_64.ads: Delete.
* system-linux-alpha.ads (Support_Atomic_Primitives): Set to True.
* system-linux-armeb.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
(Support_Atomic_Primitives): Set to True.
* system-linux-armel.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
(Support_Atomic_Primitives): Set to True.
* system-linux-mips.ads: (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
* system-linux-mipsel.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
* system-linux-s390.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
(Stack_Check_Probes): Set to True.
* system-linux-s390x.ads: Delete.
* system-linux-sparc.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
* system-linux-sparcv9.ads: Delete.
* system-linux-x86.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
* system-linux-x86_64.ads: Delete.
* system-mingw-x86_64.ads: Delete.
* system-mingw.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
* system-solaris-sparc.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
(Support_Atomic_Primitives): Set to True.
* system-solaris-sparcv9.ads: Delete.
* system-solaris-x86.ads (Word_Size): Change to Standard'Word_Size.
(Memory_Size): Change to 2 ** Word_Size.
* system-solaris-x86_64.ads: Delete.

From-SVN: r241316

Use FOR_ALL_BB_FN in a few more places

gcc/
* cfg.c (clear_bb_flags): Use FOR_ALL_BB_FN.
* config/nvptx/nvptx.c (nvptx_find_sese): Likewise.

From-SVN: r241315

vec-all-ne-0.c: New test.

gcc/testsuite/ChangeLog:

2016-10-18  Kelvin Nilsen  <kelvin@gcc.gnu.org>

* gcc.target/powerpc/vsu/vec-all-ne-0.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-1.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-10.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-11.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-12.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-13.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-14.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-2.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-3.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-4.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-5.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-6.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-7.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-8.c: New test.
* gcc.target/powerpc/vsu/vec-all-ne-9.c: New test.
* gcc.target/powerpc/vsu/vec-all-nez-1.c: New test.
* gcc.target/powerpc/vsu/vec-all-nez-2.c: New test.
* gcc.target/powerpc/vsu/vec-all-nez-3.c: New test.
* gcc.target/powerpc/vsu/vec-all-nez-4.c: New test.
* gcc.target/powerpc/vsu/vec-all-nez-5.c: New test.
* gcc.target/powerpc/vsu/vec-all-nez-6.c: New test.
* gcc.target/powerpc/vsu/vec-all-nez-7.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-0.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-1.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-10.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-11.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-12.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-13.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-14.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-2.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-3.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-4.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-5.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-6.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-7.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-8.c: New test.
* gcc.target/powerpc/vsu/vec-any-eq-9.c: New test.
* gcc.target/powerpc/vsu/vec-any-eqz-1.c: New test.
* gcc.target/powerpc/vsu/vec-any-eqz-2.c: New test.
* gcc.target/powerpc/vsu/vec-any-eqz-3.c: New test.
* gcc.target/powerpc/vsu/vec-any-eqz-4.c: New test.
* gcc.target/powerpc/vsu/vec-any-eqz-5.c: New test.
* gcc.target/powerpc/vsu/vec-any-eqz-6.c: New test.
* gcc.target/powerpc/vsu/vec-any-eqz-7.c: New test.
* gcc.target/powerpc/vsu/vec-cmpne-0.c: New test.
* gcc.target/powerpc/vsu/vec-cmpne-1.c: New test.
* gcc.target/powerpc/vsu/vec-cmpne-2.c: New test.
* gcc.target/powerpc/vsu/vec-cmpne-3.c: New test.
* gcc.target/powerpc/vsu/vec-cmpne-4.c: New test.
* gcc.target/powerpc/vsu/vec-cmpne-5.c: New test.
* gcc.target/powerpc/vsu/vec-cmpne-6.c: New test.
* gcc.target/powerpc/vsu/vec-cmpne-8.c: New test.
* gcc.target/powerpc/vsu/vec-cmpne-9.c: New test.
* gcc.target/powerpc/vsu/vec-cmpnez-1.c: New test.
* gcc.target/powerpc/vsu/vec-cmpnez-2.c: New test.
* gcc.target/powerpc/vsu/vec-cmpnez-3.c: New test.
* gcc.target/powerpc/vsu/vec-cmpnez-4.c: New test.
* gcc.target/powerpc/vsu/vec-cmpnez-5.c: New test.
* gcc.target/powerpc/vsu/vec-cmpnez-6.c: New test.
* gcc.target/powerpc/vsu/vec-cmpnez-7.c: New test.
* gcc.target/powerpc/vsu/vec-cntlz-lsbb-0.c: New test.
* gcc.target/powerpc/vsu/vec-cntlz-lsbb-1.c: New test.
* gcc.target/powerpc/vsu/vec-cntlz-lsbb-2.c: New test.
* gcc.target/powerpc/vsu/vec-cnttz-lsbb-0.c: New test.
* gcc.target/powerpc/vsu/vec-cnttz-lsbb-1.c: New test.
* gcc.target/powerpc/vsu/vec-cnttz-lsbb-2.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-0.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-1.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-10.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-11.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-12.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-13.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-2.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-3.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-4.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-5.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-6.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-7.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-8.c: New test.
* gcc.target/powerpc/vsu/vec-xl-len-9.c: New test.
* gcc.target/powerpc/vsu/vec-xlx-0.c: New test.
* gcc.target/powerpc/vsu/vec-xlx-1.c: New test.
* gcc.target/powerpc/vsu/vec-xlx-2.c: New test.
* gcc.target/powerpc/vsu/vec-xlx-3.c: New test.
* gcc.target/powerpc/vsu/vec-xlx-4.c: New test.
* gcc.target/powerpc/vsu/vec-xlx-5.c: New test.
* gcc.target/powerpc/vsu/vec-xlx-6.c: New test.
* gcc.target/powerpc/vsu/vec-xlx-7.c: New test.
* gcc.target/powerpc/vsu/vec-xrx-0.c: New test.
* gcc.target/powerpc/vsu/vec-xrx-1.c: New test.
* gcc.target/powerpc/vsu/vec-xrx-2.c: New test.
* gcc.target/powerpc/vsu/vec-xrx-3.c: New test.
* gcc.target/powerpc/vsu/vec-xrx-4.c: New test.
* gcc.target/powerpc/vsu/vec-xrx-5.c: New test.
* gcc.target/powerpc/vsu/vec-xrx-6.c: New test.
* gcc.target/powerpc/vsu/vec-xrx-7.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-0.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-1.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-10.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-11.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-12.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-13.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-2.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-3.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-4.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-5.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-6.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-7.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-8.c: New test.
* gcc.target/powerpc/vsu/vec-xst-len-9.c: New test.
* gcc.target/powerpc/vsu/vsu.exp: New file.

gcc/ChangeLog:

2016-10-18  Kelvin Nilsen  <kelvin@gcc.gnu.org>

* config/rs6000/altivec.h (vec_xl_len): New macro.
(vec_xst_len): New macro.
(vec_cmpnez): New macro.
(vec_cntlz_lsbb): New macro.
(vec_cnttz_lsbb): New macro.
(vec_xlx): New macro.
(vec_xrx): New macro.
(vec_all_nez): New C++ predicate template.
(vec_any_eqz): New C++ predicate template.
(vec_all_ne): Revised C++ predicate template under _ARCH_PWR9
conditional compilation.
(vec_any_eq): Revised C++ predicate template under _ARCH_PWR9
conditional compilation.
(vec_all_nez): New macro.
(vec_any_eqz): New macro.
(vec_all_ne): Revised macro under _ARCH_PWR9 conditional
compilation.
(vec_any_eq): Revised macro under _ARCH_PWR9 conditional
compilation.
* config/rs6000/vector.md (VI): Moved this mode iterator
definition from altivec.md to vector.md.
(UNSPEC_NEZ_P): New value.
(vector_ne_<mode>_p): New expansion for implementation of
vec_all_ne and vec_any_eq built-in functions.
(vector_nez_<mode>_p): New expansion for implementation of
vec_all_nez and vec_any_eqz built-in functions.
(vector_ne_v2di_p): New expansion for implementation of vec_all_ne
and vec_any_eq built-in function.
(cr6_test_for_zero): New commentary to explain this expansion.
(cr6_test_for_zero_reverse): New commentary to explain this expansion.
(cr6_test_for_lt): New commentary to explain this expansion.
(cr6_test_for_lt_reverse): New commentary to explain this
expansion.
* config/rs6000/rs6000-c.c (altivec_overloaded_builtins): Add
overloaded function prototypes for vec_all_ne, vec_all_nez,
vec_any_eq, vec_any_eqz, vec_cmpnez, vec_cntlz_lsbb,
vec_cnttz_lsbb, vec_xl_len, vec_xst_len, vec_xlx, and vec_xrx
built-in functions.
(altivec_resolve_overloaded_builtin): Modify the handling of
ALTIVEC_BUILTIN_VEC_CMPNE to use the Power9 instructions when
the compiler is configured to support TARGET_P9_VECTOR.
* config/rs6000/rs6000-builtin.def (BU_ALTIVEC_P): Add commentary
to explain the special processing that is given to predicate
built-ins introduced using this macro.
(BU_ALTIVEC_OVERLOAD_P): Add commentary to alert maintainers to
the special processing given to predicate built-ins introduced
using this macro.
(BU_VSX_P): Likewise.
(BU_P8V_AV_P): Likewise.
(BU_P9V_AV_P): Likewise.
(BU_P9V_AV_X): New macro.
(BU_P9V_64BIT_AV_X): New macro.
(BU_P9V_VSX_3): New macro.
(BU_P9V_OVERLOAD_P): New macro.
(LXVL): New BU_P9V_64BIT_VSX_2.
(VEXTUBLX): New BU_P9V_AV_2.
(VEXTUBRX): Likewise.
(VEXTUHLX): Likewise.
(VEXTUHRX): Likewise.
(VEXTUWLX): Likewise.
(VEXTUWRX): Likewise.
(STXVL): New BU_P9V_64BIT_AV_X.
(VCLZLSBB): New BU_P9V_AV_1.
(VCTZLSBB): Likewise.
(CMPNEB): New BU_P9V_AV_2.
(CMPNEH): Likewise.
(CMPNEW): Likewise.
(CMPNEF): Likewise.
(CMPNED): Likewise.
(VCMPNEB_P): New BU_P9V_AV_P.
(VCMPNEH_P): Likewise.
(VCMPNEW_P): Likewise.
(VCMPNED_P): Likewise.
(VCMPNEFP_P): Likewise.
(VCMPNEDP_P): Likewise.
(CMPNEZB): New BU_P9V_AV_2.
(CMPNEZH): Likewise.
(CMPNEZW): Likewise.
(VCMPNEZB_P): New BU_P9V_AV_P.
(VCMPNEZH_P): Likewise.
(VCMPNEZW_P): Likewise.
(LXVL): New BU_P9V_OVERLOAD_2.
(STXVL): New BU_P9V_OVERLOAD_3.
(VEXTULX): New BU_P9V_OVERLOAD_2.
(VEXTURX): Likewise.
(CMPNEZ): Likewise.
(VCMPNEZ_P): New BU_P9V_OVERLOAD_P.
(VCMPNE_P): Likewise.
(VCLZLSBB): New BU_P9V_OVERLOAD_1.
(VCTZLSBB): Likewise.
* config/rs6000/rs6000.c (altivec_expand_predicate_builtin): Add
comment to explain mode used for scratch register.
(altivec_expand_stxvl_builtin): New function.
(altivec_expand_builtin): Add case for new constant P9V_BUILTIN_STXVL.
(altivec_init_builtins): Add initialized variable
void_ftype_v16qi_pvoid_long and use this type to define the
built-in function __builtin_altivec_stxvl.
* config/rs6000/vsx.md (UNSPEC_LXVL): New value.
(UNSPEC_STXVL): New value.
(UNSPEC_VCLZLSBB): New value.
(UNSPEC_VCTZLSBB): New value.
(UNSPEC_VEXTUBLX): New value.
(UNSPEC_VEXTUHLX): New value.
(UNSPEC_VEXTUWLX): New value.
(UNSPEC_VEXTUBRX): New value.
(UNSPEC_VEXTUHRX): New value.
(UNSPEC_VEXTUWRX): New value.
(UNSPEC_VCMPNEB): New value.
(UNSPEC_VCMPNEZB): New value.
(UNSPEC_VCMPNEH): New value.
(UNSPEC_VCMPNEZH): New value.
(UNSPEC_VCMPNEW): New value.
(UNSPEC_VCMPNEZW): New value.
(*vsx_ne_<mode>_p): New insn for vector test all not equal with
vector of integer modes.
(*vsx_ne_<mode>_p): New insn for vector test all not equal with
vector of float or double modes.
(*vector_nez_<mode>_p): New insn for vector test all not equal or
zero.
(lxvl): New expand for load VSX vector with length.
(*lxvl): New insn for load VSX vector with length.
(stxvl): New expand for store VSX vector with length.
(*stxvl): New insn for store VSX vector with length.
(vcmpneb): New insn for vector of byte compare not equal.
(vcmpnezb): New insn for vector of byte compare not equal or zero.
(vcmpneh): New insn for vector of half word compare not equal.
(vcmpnezh): New insn for vector of half word compare not equal or
zero.
(vcmpnew): New insn for vector of word compare not equal.
(vcmpne<VSs>): New insn for vector of float or double compare not
equal.
(vcmpnezw): New insn for vector of word compare not equal or zero.
(vclzlsbb): New insn for vector count leading zero
least-significant bits byte.
(vctzlsbb): New insn for vector count trailing zero least
signficant bits byte.
(vextublx): New insn for vector extract unsigned byte left
indexed.
(vextubrx): New insn for vector extract unsigned byte right
indexed.
(vextuhlx): New insn for vector extract unsigned half word left
indexed.
(vextuhrx): New insn for vector extract unsigned half word right
indexed.
(vextuwlx): New insn for vector extract unsigned word left
indexed.
(vextuwrx): New insn for vector extract unsigned word right
indexed.
* config/rs6000/rs6000.h (RS6000_BTC_CONST): Enhance comment to
clarify intent of this constant.
* config/rs6000/altivec.md (VI): Move this mode iterator to vsx.md.
* doc/extend.texi (PowerPC Altivec Built-in Functions): Add
documentation for vec_all_nez, vec_any_eqz, vec_cmpnez,
vec_cntlz_lsbb, vec_cnttz_lsbb, vec_xl_len, vec_xst_len, vec_xlx,
and vec_xrx functions.

From-SVN: r241314

xtensa: don't use unwind-dw2-fde-dip with elf targets

Define LIB2ADDEH_XTENSA_UNWIND_DW2_FDE to unwind-dw2-fde.c in
xtensa/t-elf and to unwind-dw2-fde-dip.c in xtensa/t-linux and use
LIB2ADDEH_XTENSA_UNWIND_DW2_FDE in LIB2ADDEH definition.

This fixes build for elf target with windowed xtensa core that currently
breaks with the following error message:

  unwind-dw2-fde-dip.c:36:40: fatal error: elf.h: No such file or directory

2016-10-18  Max Filippov  <jcmvbkbc@gmail.com>
libgcc/
* config/xtensa/t-elf (LIB2ADDEH_XTENSA_UNWIND_DW2_FDE): New
definition.
* config/xtensa/t-linux (LIB2ADDEH_XTENSA_UNWIND_DW2_FDE): New
definition.
* config/xtensa/t-windowed (LIB2ADDEH): Use
LIB2ADDEH_XTENSA_UNWIND_DW2_FDE defined by either xtensa/t-elf
or xtensa/t-linux.

From-SVN: r241313

xtensa: add HW FPU sequences for DIV/SQRT/RECIP/RSQRT

Use new FPU instruction sequences documented in the ISA book to
implement __divsf3, __divdf3, __recipsf2, __recipdf2, __rsqrtsf2,
__rsqrtdf2 and __ieee754_sqrtf and __ieee754_sqrt.

2016-10-18  Ding-Kai Chen  <dkchen@cadence.com>
libgcc/
* config/xtensa/ieee754-df.S (__recipdf2, __rsqrtdf2,
__ieee754_sqrt): New functions.
(__divdf3): Add implementation with new FPU instructions under
#if XCHAL_HAVE_DFP_DIV.
* config/xtensa/ieee754-sf.S (__recipsf2, __rsqrtsf2,
__ieee754_sqrtf): New functions.
(__divsf3): Add implementation with new FPU instructions under
#if XCHAL_HAVE_FP_DIV.
* config/xtensa/t-xtensa (LIB1ASMFUNCS): Add _sqrtf, _recipsf2
_rsqrtsf2, _sqrt, _recipdf2 and _rsqrtdf2.

From-SVN: r241312

Fix indentation of experimental::shared_ptr code

* include/experimental/bits/shared_ptr.h: Fix indentation.

From-SVN: r241311

Fix typos in experimental::shared_ptr

* include/experimental/bits/shared_ptr.h (shared_ptr(shared_ptr&&)):
Remove const from parameter.
(operator<(const shared_ptr<T>&, nullptr_t)): Use correct
specialization of std::less.
* testsuite/experimental/memory/shared_ptr/comparison/comparison.cc:
Test comparison with nullptr and actually call test functions.

From-SVN: r241310

re PR middle-end/65950 (exit in main is causing the path to it to become unlikely.)

2016-10-18  Andrew Pinski  <apinski@cavium.com>

        PR tree-opt/65950
        * predict.c (is_exit_with_zero_arg): New function.
        (tree_bb_level_predictions): Don't consider paths leading to exit(0)
        as nottaken.

From-SVN: r241309

re PR target/77991 (ICE on x32 in plus_constant, at explow.c:87)

PR target/77991
* config/i386/i386.c (legitimize_tls_address)
<case TLS_MODEL_INITIAL_EXEC>: For TARGET_64BIT || TARGET_ANY_GNU_TLS
convert dest to Pmode if different than Pmode.

testsuite/ChangeLog:

PR target/77991
* gcc.target/i386/pr77991.c: New test.

From-SVN: r241308

runtime: copy netpoll code from Go 1.7 runtime

    Reviewed-on: https://go-review.googlesource.com/31325

From-SVN: r241307

Set gcc_force_conventional_output even without LTO linker plugin

gcc/testsuite/

* lib/gcc-dg.exp: Set gcc_force_conventional_output whenever
LTO is used.

Set gcc_force_conventional_output even without LTO linker plugin

From-SVN: r241306

re PR tree-optimization/77916 (ICE in verify_gimple_in_cfg: invalid (pointer) operands to plus/minus)

2016-10-18  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

PR tree-optimization/77916
* gimple-ssa-strength-reduction.c (analyze_increments): Reinstate
stopgap fix, as pointers with -1 increment are still broken.

From-SVN: r241305

runtime: scan caller-saved registers for non-split-stack

    While testing a patch on Solaris, which does not support split-stack, I
    ran across a bug in the handling of caller-saved registers for the
    garbage collector.  For non-split-stack systems, runtime_mcall is
    responsible for saving all caller-saved registers on the stack so that
    the GC stack scan will see them.  It does this by calling
    __builtin_unwind_init and setting the g's gcnextsp field to point to the
    current stack.  The garbage collector then scans the stack from gcnextsp
    to the top of stack.

    Unfortunately, the code was setting gcnextsp to point to runtime_mcall's
    argument, which meant that even though runtime_mcall was careful to
    store all caller-saved registers on the stack, the GC never saw them.
    This is, of course, only a problem if a value lives only in a
    caller-saved register, and not anywhere else on the stack or heap.  And
    it is only a problem if that caller-saved register manages to make it
    all the way down to runtime_mcall without being saved by any function on
    the way.  This is moderately unlikely but it turns out that the recent
    changes to keep values on the stack when compiling the runtime package
    caused it to happen for the local variable `s` in `notifyListWait` in
    runtime/sema.go.  That function calls goparkunlock which is simple
    enough to not require all registers, and itself calls runtime_mcall.  So
    it was possible for `s` to be released by the GC before the goroutine
    returned from goparkunlock, which eventually caused a dangling pointer
    to be passed to releaseSudog.

    This is not a problem on split-stack systems, which use
    __splitstack_get_context, which saves a stack pointer low enough on the
    stack to scan the registers saved by runtime_mcall.

    Reviewed-on: https://go-review.googlesource.com/31323

From-SVN: r241304