re PR tree-optimization/84775 (ICE on valid code at -O3: in check_loop_closed_ssa_def, at tree-ssa-loop-manip.c:709)

2018-03-09  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/84775
	* tree-if-conv.c (add_bb_predicate_gimplified_stmts): Delink
	immediate uses of predicate stmts and mark them modified.

	Revert
	PR tree-optimization/84178
	* tree-if-conv.c (combine_blocks): Move insert_gimplified_predicates
	to caller.
	(version_loop_for_if_conversion): Delay update_ssa call.
	(tree_if_conversion): Delay update_ssa until after predicate
	insertion.

	* gcc.dg/torture/pr84775.c: New testcase.

From-SVN: r258387

The compiler builtin will use the hardware instruction cdsg if the
memory operand is properly aligned and will fall back to the
library call otherwise.
In case the compiler for one part is able to detect that the
location is aligned and fails to do so for another usage of the hw
instruction and the sw fall back would be mixed on the same memory
location.  To avoid this the library fall back also has to use the
hardware instruction if possible.

libatomic/ChangeLog:

2018-03-09  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* config/s390/exch_n.c: New file.
	* configure.tgt: Add the config directory for s390.

From-SVN: r258384

https://gcc.gnu.org/ml/gcc-patches/2018-03/msg00425.html
	PR c++/84733
	* name-lookup.c (do_pushdecl_with_scope): Only clear
	current_function_decl when pushing a non-class (i.e. namespace)
	scope.

From-SVN: r258383

re PR debug/84404 (Several "leb128 operand is an undefined symbol" in go testsuite with latest debug improvements)

	PR debug/84404
	* gcc.dg/graphite/pr84404.c: Only compile on pthread effective
	targets.

From-SVN: r258382

	PR target/84763
	* config/i386/winnt.c (i386_pe_seh_cold_init): Use small pre-allocation
	when the function accesses prior frames.

From-SVN: r258381

printers.py (build_libstdcxx_dictionary): Fix std::_Fwd_list_iterator and std::_Fwd_list_const_iterator printers registration.

2018-03-09  François Dumont  <fdumont@gcc.gnu.org>

	* python/libstdcxx/v6/printers.py (build_libstdcxx_dictionary):
	Fix std::_Fwd_list_iterator and std::_Fwd_list_const_iterator printers
	registration.

From-SVN: r258380

	PR libstdc++/84769
	* include/std/variant (get<_Tp, _Types...>, get_if<_Tp, _Types...>):
	Qualify calls to get<_Np, Types...> and get_if<_Np, _Types...>.

From-SVN: r258376

The create_dir helper was calling the throwing form of
filesystem::is_directory instead of passing the error_code argument.
Since std::filesystem::create_directory(const path&, error_code&) is
noexcept, it would call std::terminate if an error occurred in
is_directory.

Passing the error_code also takes care of clearing it in the case where
is_directory returns true.

	src/filesystem/ops.cc (create_dir): Pass error_code to is_directory.
	src/filesystem/std-ops.cc (create_dir): Likewise.

From-SVN: r258375

From-SVN: r258374

	PR debug/84456
	* dwarf2out.c (dw_loc_list): If list && loc_list->first->next, call
	gen_llsym, otherwise call maybe_gen_llsym.

From-SVN: r258371

	PR c++/80598
	* call.c (build_over_call): In templates set TREE_USED (first_fn) when
	not calling mark_used for the benefit of -Wunused-function warning.

	* g++.dg/warn/Wunused-function4.C: New test.

From-SVN: r258370

re PR inline-asm/84742 (internal compiler error: in process_alt_operands, at lra-constraints.c:2112)

	PR inline-asm/84742
	* recog.c (asm_operand_ok): Return 0 if multi-character constraint
	has ',' character inside of it.

	* gcc.target/i386/pr84742-1.c: New test.
	* gcc.target/i386/pr84742-2.c: New test.

From-SVN: r258369

In this wrong-code PR the combine pass ends up moving a CC-using instruction past a *compare_cstore<mode>_insn
insn_and_split. After reload the *compare_cstore<mode>_insn splitter ends up generating a SUBS instruction that
clobbers the condition flags, and things go bad.

The solution is simple, the *compare_cstore<mode>_insn pattern should specify that it clobbers the CC register
so that combine (or any other pass) does not assume that it can move CC-using patterns across it.

This patch does that and fixes the testcase.

The testcase FAILs on GCC 8 only, but the buggy pattern is in GCC 6 onwards, so we should backport this as
a latent bug fix after it's had some time to bake in trunk.

Bootstrapped and tested on aarch64-none-linux-gnu.

	PR target/84748
	* config/aarch64/aarch64.md (*compare_cstore<mode>_insn): Mark pattern
	as clobbering CC_REGNUM.

	* gcc.c-torture/execute/pr84748.c: New test.

From-SVN: r258366

re PR tree-optimization/84552 (Compile time hog w/ -O2 -floop-nest-optimize -fno-tree-copy-prop -fno-tree-fre -fno-tree-loop-ivcanon)

2018-03-08  Richard Biener  <rguenther@suse.de>

	PR middle-end/84552
	* tree-scalar-evolution.c: Include tree-into-ssa.h.
	(follow_copies_to_constant): Do not follow SSA names registered
	for update.

	* gcc.dg/graphite/pr84552.c: New testcase.

From-SVN: r258365

2018-03-08  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/84178
	* tree-if-conv.c (combine_blocks): Move insert_gimplified_predicates
	to caller.
	(version_loop_for_if_conversion): Delay update_ssa call.
	(tree_if_conversion): Delay update_ssa until after predicate
	insertion.

	* gcc.dg/torture/pr84178-2.c: New testcase.

From-SVN: r258364

PR tree-optimization/84178 reports a couple of source files that ICE inside
ifcvt when compiled with -03 -fno-tree-forwprop (trunk and gcc 7).

Both cases involve problems with ifcvt's per-BB gimplified predicates.

Testcase 1 fails this assertion within release_bb_predicate during cleanup:

283	      if (flag_checking)
284		for (gimple_stmt_iterator i = gsi_start (stmts);
285		     !gsi_end_p (i); gsi_next (&i))
286		  gcc_assert (! gimple_use_ops (gsi_stmt (i)));

The testcase contains a division in the loop, which leads to
if_convertible_loop_p returning false (due to gimple_could_trap_p being true
for the division).  This happens *after* the per-BB gimplified predicates
have been created in predicate_bbs (loop).
Hence tree_if_conversion bails out to "cleanup", but the gimplified predicates
exist and make use of SSA names; for example this conjunction for two BB
conditions:

  _4 = h4.1_112 != 0;
  _175 = (signed char) _117;
  _176 = _175 >= 0;
  _174 = _4 & _176;

is using SSA names.

This assertion was added in r236498 (aka c3deca2519d97c55876869c57cf11ae1e5c6cf8b):

    2016-05-20  Richard Biener  <rguenther@suse.de>

        * tree-if-conv.c (add_bb_predicate_gimplified_stmts): Use
        gimple_seq_add_seq_without_update.
        (release_bb_predicate): Assert we have no operands to free.
        (if_convertible_loop_p_1): Calculate post dominators later.
        Do not free BB predicates here.
        (combine_blocks): Do not recompute BB predicates.
        (version_loop_for_if_conversion): Save BB predicates around
        loop versioning.

        * gcc.dg/tree-ssa/ifc-cd.c: Adjust.

The following patch fixes this by adding a call to gimple_seq_discard
to release_bb_predicate.  It also updates the assertion, so that
instead of asserting the stmts have no imm uses, instead assert that
they weren't added to a bb before discarding them (otherwise discarding
them would be a bug).  We know this is the case because
insert_gimplified_predicates has:

	  /* Once the sequence is code generated, set it to NULL.  */
	  set_bb_predicate_gimplified_stmts (bb, NULL);

but asserting it seems appropriate as a double-check.

The patch doesn't address the 2nd issue within PR tree-optimization/84178.

gcc/ChangeLog:
	PR tree-optimization/84178
	* tree-if-conv.c (release_bb_predicate): Remove the
	the assertion that the stmts have NULL use_ops.
	Discard the statements, asserting that they haven't
	yet been added to a BB.

gcc/testsuite/ChangeLog:
	PR tree-optimization/84178
	* gcc.c-torture/compile/pr84178-1.c: New test.

From-SVN: r258363

2018-03-08  Thomas Schwinge  <thomas@codesourcery.com>

	* lib/target-supports.exp: Do not return zero from a ifunc
	function.

From-SVN: r258362

2018-03-08  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/84746
	* tree-ssa-pre.c (find_leader_in_sets): Deal with SET1 being NULL.
	(phi_translate): Pass in destination ANTIC_OUT set.
	(phi_translate_1): Likewise.  For a simplified result lookup
	a leader in ANTIC_OUT and AVAIL_OUT, not the ANTIC_IN sets.
	(phi_translate_set): Adjust.
	(do_pre_regular_insertion): Likewise.
	(do_pre_partial_partial_insertion): Likewise.

	* gcc.dg/torture/pr84746.c: New testcase.

From-SVN: r258361

2018-03-08  Martin Liska  <mliska@suse.cz>

	PR gcov-profile/84735
	* doc/gcov.texi: Document usage of profile files.
	* gcov-io.h: Document changes in the format.

From-SVN: r258360

Location views might be associated with locations that lack line
number information (line number zero), but since we omit .loc
directives that would have been issued with line number zero, we also
omit the symbolic view numbers that would have been issued at such
points.

Resetting views at function entry points address some of these issues,
and alleviate the huge chains of symbolic views that have burdened
assemblers since we disabled -ginternal-reset-location-views by
default, but other problems of undefined views remain when it's not
the whole function that lacks line number info, just parts of it.

So, when we encounter a request to output a view that may have been
referenced, but we decide to omit the .loc because the line is zero,
we will now omit the view as well, i.e., we will internally regard
that view as zero-numbered.

for  gcc/ChangeLog

	PR debug/84404
	PR debug/84408
	* dwarf2out.c (struct dw_line_info_table): Update comments for
	view == -1.
	(FORCE_RESET_NEXT_VIEW): New.
	(FORCE_RESETTING_VIEW_P): New.
	(RESETTING_VIEW_P): Check for -1 too.
	(ZERO_VIEW_P): Likewise.
	(new_line_info_table): Force-reset next view.
	(dwarf2out_begin_function): Likewise.
	(dwarf2out_source_line): Simplify zero_view_p initialization.
	Test FORCE_RESETTING_VIEW_P and RESETTING_VIEW_P instead of
	view directly.  Omit view when omitting .loc at line 0.

for  gcc/testsuite/ChangeLog

	PR debug/84404
	PR debug/84408
	* gcc.dg/graphite/pr84404.c: New.

From-SVN: r258355

	PR tree-optimization/84740
	* tree-switch-conversion.c (process_switch): Call build_constructors
	only if info.phi_count is non-zero.

	* gcc.dg/torture/pr84740.c: New test.

From-SVN: r258354

	PR tree-optimization/84739
	* tree-tailcall.c (find_tail_calls): Check call arguments against
	DECL_ARGUMENTS (current_function_decl) rather than
	DECL_ARGUMENTS (func) when checking for tail recursion.

	* gcc.dg/pr84739.c: New test.

From-SVN: r258351

2018-03-08  François Dumont  <fdumont@gcc.gnu.org>

	* python/libstdcxx/v6/printers.py (NodeIteratorPrinter): New.
	(StdListIteratorPrinter): Inherit from latter.
	(StdFwdListIteratorPrinter): New, inherit from latter.
	(StdDebugIteratorPrinter.to_string): Use non-debug iterator printer
	when iterator has no associated container.
	(build_libstdcxx_dictionary): Add __gnu_cxx::_Fwd_list_iterator and
	__gnu_cxx::_Fwd_list_const_iterator printers. Remove __norm namespace
	registrations.
	* testsuite/libstdc++-prettyprinters/debug.cc: Adapt.
	* testsuite/libstdc++-prettyprinters/debug_cxx11.cc: Adapt.

From-SVN: r258350

gcc/testsuite/ChangeLog:

	* gcc.dg/Wrestrict-13.c: New test.

From-SVN: r258348

2018-03-07  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/64124
	PR fortran/70409
	* decl.c (gfc_match_char_spec): Try to reduce a charlen to a constant.

2018-03-07  Steven G. Kargl  <kargl@gcc.gnu.org>

	PR fortran/64124
	PR fortran/70409
	* gfortran.dg/pr64124.f90: New tests.
	* gfortran.dg/pr70409.f90: New tests.

From-SVN: r258347

From-SVN: r258345

	* doc/contrib.texi: Add entries for Martin Liska, David Malcolm,
	Marek Polacek, extend Vladimir Makarov's, Jonathan Wakely's and
	Volker Reichelt's entry and add entries for people that perform
	GCC fuzzy testing and report numerous bugs.

From-SVN: r258342

	* lambda.c (is_capture_proxy_with_ref): Remove.

	* constexpr.c, expr.c, cp-tree.h, semantics.c: Adjust.

From-SVN: r258341

This adds a new option -mreadonly-in-sdata (on by default) that
controls whether readonly data can be put in sdata.  (For EABI this
does nothing, readonly data is put in sdata2 as usual).


	PR target/82411
	* config/rs6000/rs6000.c (rs6000_elf_in_small_data_p): Don't put
	readonly data in sdata, if that is disabled.
	* config/rs6000/sysv4.opt (mreadonly-in-sdata): New option.
	* doc/invoke.texi (RS/6000 and PowerPC Options): Document
	-mreadonly-in-sdata option.

gcc/testsuite/
	PR target/82411
	* gcc.target/powerpc/ppc-sdata-2.c: Skip if -mno-readonly-in-sdata.

From-SVN: r258340

PR tree-optimization/84468 - bogus -Wstringop-truncation despite assignment after conditional strncpy

gcc/ChangeLog:

	PR tree-optimization/84468
	* tree-ssa-strlen.c (maybe_diag_stxncpy_trunc): Consider successor
	basic block when looking for nul assignment.

gcc/testsuite/ChangeLog:

	PR tree-optimization/84468
	* g++.dg/warn/Wstringop-truncation-2.C: New test.
	* gcc.dg/Wstringop-truncation.c: New test.
	* gcc.dg/Wstringop-truncation-2.c: New test.

From-SVN: r258339

	PR target/84277
	* except.h (output_function_exception_table): Adjust prototype.
	* except.c (output_function_exception_table): Remove FNNAME parameter
	and add SECTION parameter.  Ouput one part of the table at a time.
	* final.c (final_scan_insn_1) <NOTE_INSN_SWITCH_TEXT_SECTIONS>: Output
	the first part of the exception table and emit unwind directives.
	* config/i386/i386-protos.h (i386_pe_end_cold_function): Declare.
	(i386_pe_seh_cold_init): Likewise.
	* config/i386/cygming.h (ASM_DECLARE_COLD_FUNCTION_NAME): New macro.
	(ASM_DECLARE_COLD_FUNCTION_SIZE): Likewise.
	* config/i386/i386.c (x86_expand_epilogue): Fix wording in comment.
	(ix86_output_call_insn): Emit a nop in one more case for SEH.
	* config/i386/winnt.c: Include except.h.
	(struct seh_frame_state): Add reg_offset, after_prologue and
	in_cold_section fields.
	(i386_pe_seh_end_prologue): Set seh->after_prologue.
	(i386_pe_seh_cold_init): New function.
	(i386_pe_seh_fini): Add COLD parameter and bail out if it is not equal
	to seh->in_cold_section.
	(seh_emit_push): Record the offset of the push.
	(seh_emit_save): Record the offet of the save.
	(i386_pe_seh_unwind_emit): Deal with NOTE_INSN_SWITCH_TEXT_SECTIONS.
	Test seh->after_prologue to disregard the epilogue.
	(i386_pe_end_function): Pass FALSE to i386_pe_seh_fini.
	(i386_pe_end_cold_function): New function.

From-SVN: r258338

    
    Reviewed-on: https://go-review.googlesource.com/99117

From-SVN: r258337

    
    This implements the same choices made in the gc runtime, except that
    for 32-bit x86 we only use the fence instruction if the processor
    supports SSE2.
    
    The code here is hacked up for speed; the gc runtime uses straight
    assembler.
    
    Reviewed-on: https://go-review.googlesource.com/97715

From-SVN: r258336

The $(GNATLIBCFLAGS) are already included in $(GNATLIBCFLAGS_FOR_C).

We must call the C compiler with the right machine flags.  So, add
$(GNATLIBCFLAGS_FOR_C) to $(OSCONS_EXTRACT).  For example, on a bi-arch
compiler supporting 32-bit and 64-bit instruction sets we pick otherwise
only one variant due to a missing -m32 or -m64 flag.

gcc/ada
	* gcc-interface/Makefile.in (OSCONS_CPP): Remove redundant
	$(GNATLIBCFLAGS).
	(OSCONS_EXTRACT): Add $(GNATLIBCFLAGS_FOR_C).

From-SVN: r258334

	PR fortran/84565
	* config/aarch64/predicates.md (aarch64_simd_reg_or_zero): Use
	aarch64_simd_or_scalar_imm_zero rather than aarch64_simd_imm_zero.

	* gfortran.dg/pr84565.f90: New test.

From-SVN: r258333

	PR c++/84704
	* gimple-expr.c (create_tmp_var_raw): Set DECL_NAMELESS flag
	on tmp_var.
	* tree-pretty-print.c (dump_decl_name): For TDF_COMPARE_DEBUG,
	don't print names of DECL_NAMELESS DECL_IGNORED_P decls.

From-SVN: r258317

	PR middle-end/84723
	* multiple_target.c: Include tree-inline.h and intl.h.
	(expand_target_clones): Diagnose and fail if node->definition and
	!tree_versionable_function_p (node->decl).

	* gcc.target/i386/pr84723-1.c: New test.
	* gcc.target/i386/pr84723-2.c: New test.
	* gcc.target/i386/pr84723-3.c: New test.
	* gcc.target/i386/pr84723-4.c: New test.
	* gcc.target/i386/pr84723-5.c: New test.

From-SVN: r258316

From-SVN: r258314

	* config/pa/pa.h (ASM_GENERATE_INTERNAL_LABEL): Revise to use
	sprint_ul.
	(ASM_OUTPUT_ADDR_VEC_ELT): Revise for above change.
	(ASM_OUTPUT_ADDR_DIFF_ELT): Likewise.
	* config/pa/pa64-hpux.h (ASM_GENERATE_INTERNAL_LABEL): Revise as above.

From-SVN: r258312

2018-03-06  Steven G. Kargl  <kargl@gcc.gnu.org>

        PR fortran/64107
        * gfortran.dg/pr64107.f90: New test.

From-SVN: r258311