2017-01-06  Yannick Moy  <moy@adacore.com>

	* ghost.adb Minor fixing of references to SPARK RM.
	(Check_Ghost_Context): Check whether reference is to a lvalue
	before issuing an error about violation of SPARK RM 6.9(13)
	when declaration has Ghost policy Check and reference has Ghost
	policy Ignore.
	* sem_util.adb Minor indentation.
	* sem_ch10.adb (Analyze_Package_Body_Stub, Analyze_Protected_Body_Stub,
	Analyze_Task_Body_Stub): Set Ekind of the defining identifier.
	* sem_util.ads (Unique_Defining_Entity): Document the result
	for package body stubs.

2017-01-06  Tristan Gingold  <gingold@adacore.com>

	* raise-gcc.c (abort): Macro to call Abort_Propagation.
	* s-tpoben.ads (Protected_Entry_Queue_Max_Access): Make it access
	constant.
	* exp_ch9.adb (Expand_N_Protected_Type_Declaration):
	Do not generate the Entry_Max_Queue_Lengths_Array if all default
	values.
	* exp_util.adb (Corresponding_Runtime_Package): Consider
	Max_Queue_Length pragma.

From-SVN: r244129

2017-01-06  Justin Squirek  <squirek@adacore.com>

	* exp_ch9.adb (Expand_N_Protected_Type_Declaration):
	Remove declaration generation in the case of
	System_Tasking_Protected_Objects_Single_Entry being used,
	and add a warning message when this is detected to occur.
	(Make_Initialize_Protection): Remove reference pass in the case
	of System_Tasking_Protected_Objects_Single_Entry.
	* rtsfind.ads: Remove RE_Protected_Entry_Queue_Max
	* s-tposen.adb (Initialize_Protection_Entry): Remove
	Entry_Queue_Max parameter.
	* s-tposen.ads: Remove the types use to store the entry queue
	maximum.
	* sem_prag.adb (Analyze_Pragma): Remove entry families restriction

2017-01-06  Yannick Moy  <moy@adacore.com>

	* sem_util.adb, sem_util.ads (Get_Enum_Lit_From_Pos): Strengthen
	behavior of function, to also accept out of range positions
	and raise Constraint_Error in such case, and to copy sloc from
	literal if No_Location passed as location.
	* uintp.adb, uintp.ads (UI_To_Int, UI_To_CC): Strengthen behavior
	of functions to raise Constraint_Error in case of value not in
	appropriate range.

2017-01-06  Tristan Gingold  <gingold@adacore.com>

	* sem_util.adb, s-taprop-linux.adb (Finalize_TCB): Remove call to
	Invalidate_Stack_Cache.

2017-01-06  Eric Botcazou  <ebotcazou@adacore.com>

	* s-os_lib.adb: Minor fix to the signature of Readlink.

2017-01-06  Javier Miranda  <miranda@adacore.com>

	* sem_ch6.adb (Conforming_Types): Handle another
	confusion between views in a nested instance with an actual
	private type whose full view is not in scope.

2017-01-06  Arnaud Charlet  <charlet@adacore.com>

	* exp_ch5.adb (Expand_N_If_Statement): Obey existing comment and
	mark a rewritten if statement as explicit (Comes_From_Source).

From-SVN: r244128

2017-01-06  Gary Dismukes  <dismukes@adacore.com>

	* sem_prag.adb, rtsfind.adb, sem_util.adb: Minor typo fixes.

From-SVN: r244127

2017-01-06  Tristan Gingold  <gingold@adacore.com>

	* ada.ads, a-unccon.ads: Add pragma No_Elaboration_Code_All.

2017-01-06  Hristian Kirtchev  <kirtchev@adacore.com>

	* sem_case.adb: Minor reformatting.

2017-01-06  Thomas Quinot  <quinot@adacore.com>

	* g-socthi-mingw.adb: Remove now extraneous USE TYPE clause

2017-01-06  Justin Squirek  <squirek@adacore.com>

	* aspects.adb: Register aspect in Canonical_Aspect.
	* aspects.ads: Associate qualities of Aspect_Max_Queue_Length
	into respective tables.
	* einfo.ads, einfo.adb: Add a new attribute for
	handling the parameters for Pragma_Max_Entry_Queue
	(Entry_Max_Queue_Lengths_Array) in E_Protected_Type. Subprograms
	for accessing and setting were added as well.
	* par-prag.adb (Prag): Register Pramga_Max_Entry_Queue.
	* exp_ch9.adb (Expand_N_Protected_Type_Declaration): Emit
	declaration for pramga arguments and store them in the protected
	type node.
	(Make_Initialize_Protection): Pass a reference to
	the Entry_Max_Queue_Lengths_Array in the protected type node to
	the runtime.
	* rtsfind.adb: Minor grammar fix.
	* rtsfind.ads: Register new types taken from the
	runtime libraries RE_Protected_Entry_Queue_Max and
	RE_Protected_Entry_Queue_Max_Array
	* s-tposen.adb, s-tpoben.adb
	(Initialize_Protection_Entry/Initialize_Protection_Entries):
	Add extra parameter and add assignment to local object.
	* s-tposen.ads, s-tpoben.ads: Add new types to
	store entry queue maximums and a field to the entry object record.
	* sem_ch13.adb (Analyze_Aspect_Specifications): Add case statement
	for Aspect_Max_Queue_Length.
	(Check_Aspect_At_Freeze_Point):
	Add aspect to list of aspects that don't require delayed analysis.
	* sem_prag.adb (Analyze_Pragma): Add case statement for
	Pragma_Max_Queue_Length, check semantics, and register arugments
	in the respective entry nodes.
	* sem_util.adb, sem_util.ads Add functions Get_Max_Queue_Length
	and Has_Max_Queue_Length
	* snames.ads-tmpl: Add constant for the new aspect-name
	Name_Max_Queue_Length and corrasponding pragma.

2017-01-06  Hristian Kirtchev  <kirtchev@adacore.com>

	* exp_util.adb (Is_Controlled_Function_Call):
	Reimplemented. Consider any node which has an entity as the
	function call may appear in various ways.

From-SVN: r244126

2017-01-06  Hristian Kirtchev  <kirtchev@adacore.com>

	* exp_attr.adb (Rewrite_Stream_Proc_Call): Use
	an unchecked type conversion when performing a view conversion
	to/from a private type. In all other cases use a regular type
	conversion to ensure that any relevant checks are properly
	installed.

2017-01-06  Hristian Kirtchev  <kirtchev@adacore.com>

	* sem_prag.adb, sem_ch8.adb: Minor reformatting.

2017-01-06  Ed Schonberg  <schonberg@adacore.com>

	* sem_case.adb (Explain_Non_Static_Bound): Suppress cascaded
	error on case expression that is an entity, when coverage is
	incomplete and entity has a static value obtained by local
	propagation.
	(Handle_Static_Predicate): New procedure, subsidiary of
	Check_Choices, to handle case alternatives that are either
	subtype names or subtype indications involving subtypes that
	have static predicates.

2017-01-06  Thomas Quinot  <quinot@adacore.com>

	* s-oscons-tmplt.c, g-socket.adb, g-socket.ads, g-sothco.ads:
	(GNAT.Socket): Add support for Busy_Polling and Generic_Option

2017-01-06  Bob Duff  <duff@adacore.com>

	* sem_elab.adb (Activate_Elaborate_All_Desirable): Don't add
	Elaborate_All(P) to P itself. That could happen in obscure cases,
	and always introduced a cycle (P body must be elaborated before
	P body).
	* lib-writ.ads: Comment clarification.
	* ali-util.ads: Minor comment fix.
	* ali.adb: Minor reformatting.

2017-01-06  Tristan Gingold  <gingold@adacore.com>

	* a-exexpr-gcc.adb: Improve comment.

From-SVN: r244125

From-SVN: r244124

simplify_transformation_to_array had the nested loop unrolled 7 times,
which is reasonable given that it iterates over arrays of size
GFC_MAX_DIMENSIONS == 7.

The problem is that the last iteration increments the index, tests
that it's less than result->rank, and then accesses the arrays with
the incremented index.

We did not optimize out that part in the 7th iteration, so VRP flagged
the unreachable code as accessing arrays past the end.

It couldn't possibly know that we'd never reach that part, since the
test was on result->rank, and it's not obvious (for the compiler) that
result->rank <= GFC_MAX_DIMENSIONS.

Even an assert to that effect before the enclosing loop didn't avoid
the warning turned to error, though; I suppose there might be some
aliasing at play, because moving the assert into the loop does.  An
assert on the index itself would also work, even more efficiently, but
we're just silencing the warning instead.

for  gcc/fortran/ChangeLog

	* simplify.c (simplify_transformation_to_array): Silence
	array bounds warning.  Fix whitespace.

From-SVN: r244122

In stage2 of bootstrap-O1, the code that warns if sprintf might
overflow its output buffer cannot tell that an unsigned value narrowed
to 16 bits will fit in 4 bytes with %4x.

Converting the value to 'unsigned short' makes it obvious that it
fits, at least on machines with 16-bit shorts.

for  gcc/c-family/ChangeLog

	* c-pretty-print.c (pp_c_tree_decl_identifier): Convert 16-bit
	value to unsigned short to fit in 4 hex digits without
	warnings.

From-SVN: r244121

From-SVN: r244119

gcc/ChangeLog:

	PR tree-optimization/78910
	* gimple-ssa-sprintf.c (tree_digits): Add an argument.
	(format_integer): Correct off-by-one error in the handling
	of precision with negative numbers in signed conversions..

gcc/testsuite/ChangeLog:

	PR tree-optimization/78910
	* gcc.dg/tree-ssa/builtin-sprintf-warn-7.c: Adjust text of expected
	diagnostics.
	* gcc.dg/tree-ssa/builtin-sprintf.c: Add test cases.
	* gcc.dg/tree-ssa/pr78910.c: New test.

From-SVN: r244116

        * doc/invoke.texi (C Dialect Options): Document it.
c-family/
        * c.opt (fsso-struct): Add 'native' value.

From-SVN: r244115

	PR tree-optimization/71016
	* tree-ssa-phiopt.c (tree_ssa_phiopt_worker): Pass cond_stmt to
	factor_out_conditional_conversion.  Formatting fix.
	(factor_out_conditional_conversion): Add cond_stmt argument.
	If arg1 is INTEGER_CST, punt if new_arg0 is not any operand of
	cond_stmt and if arg0_def_stmt is not the only stmt in its bb.
	Formatting fix.

	* gcc.target/i386/pr71016.c: New test.
	* gcc.target/aarch64/pr71016.c: New test.
	* gcc.dg/tree-ssa/pr66726-3.c: New test.

From-SVN: r244114

	PR c++/78931
	* decl.c (cp_finish_decomp): Remove probe variable, if tt is
	REFERENCE_REF_P, set tt to its operand.

	* g++.dg/cpp1z/decomp19.C: New test.

From-SVN: r244113

	PR c++/78890
	* class.c (check_field_decls): Diagnose REFERENCE_TYPE fields in
	unions even for C++11 and later.

	* g++.dg/init/ref14.C: Expect error even in C++11 and later.
	* g++.dg/init/union1.C: Likewise.
	* g++.dg/cpp0x/union6.C: Expect errors.
	* g++.dg/cpp0x/union8.C: New test.
	* g++.dg/cpp0x/pr78890-1.C: New test.
	* g++.dg/cpp0x/pr78890-2.C: New test.

From-SVN: r244112

        * gcc.target/powerpc/pr71670.c: Require p9vector.
        * gcc.target/powerpc/p9-novsx.c: Same.

From-SVN: r244111

This is the combination of these patches:
- [8a/9] Introduce class function_reader (v8)
- Add ASSERT_RTX_PTR_EQ
- [8b/9] Add target-independent selftests of RTL function reader (v2)
- [8c/9] Add aarch64-specific selftests for RTL function reader (v2)
- [8d/9] Add x86_64-specific selftests for RTL function reader (v2)

gcc/ChangeLog:
	* Makefile.in (OBJS): Add read-md.o, read-rtl.o,
	read-rtl-function.o, and selftest-rtl.o.
	* config/aarch64/aarch64.c: Include selftest.h and
	selftest-rtl.h.
	(selftest::aarch64_test_loading_full_dump): New function.
	(selftest::aarch64_run_selftests): New function.
	(TARGET_RUN_TARGET_SELFTESTS): Wire it up to
	selftest::aarch64_run_selftests.
	* config/i386/i386.c
	(selftest::ix86_test_loading_dump_fragment_1): New function.
	(selftest::ix86_test_loading_call_insn): New function.
	(selftest::ix86_test_loading_full_dump): New function.
	(selftest::ix86_test_loading_unspec): New function.
	(selftest::ix86_run_selftests): Call the new functions.
	* emit-rtl.c (maybe_set_max_label_num): New function.
	* emit-rtl.h (maybe_set_max_label_num): New decl.
	* function.c (instantiate_decls): Guard call to
	instantiate_decls_1 with if (DECL_INITIAL (fndecl)).
	* function-tests.c (selftest::verify_three_block_rtl_cfg): Remove
	"static".
	* gensupport.c (gen_reader::gen_reader): Pass "false"
	for new "compact" param of rtx_reader.
	* print-rtl.c (rtx_writer::print_rtx_operand): Print "(nil)"
	rather than an empty string for NULL strings.
	* read-md.c: Potentially include config.h rather than bconfig.h.
	Wrap include of errors.h with #ifdef GENERATOR_FILE.
	(have_error): New global, copied from errors.c.
	(md_reader::read_name): Rename to...
	(md_reader::read_name_1): ...this, adding "out_loc" param,
	and converting "missing name or number" to returning false, rather
	than failing.
	(md_reader::read_name): Reimplement in terms of read_name_1.
	(md_reader::read_name_or_nil): New function.
	(md_reader::read_string): Handle "(nil)" by returning NULL.
	(md_reader::md_reader): Add new param "compact".
	(md_reader::read_md_files): Wrap with #ifdef GENERATOR_FILE.
	(md_reader::read_file): New method.
	* read-md.h (md_reader::md_reader): Add new param "compact".
	(md_reader::read_file): New method.
	(md_reader::is_compact): New accessor.
	(md_reader::read_name): Convert return type from void to
	file_location.
	(md_reader::read_name_or_nil): New decl.
	(md_reader::read_name_1): New decl.
	(md_reader::m_compact): New field.
	(noop_reader::noop_reader): Pass "false" for new "compact" param
	of rtx_reader.
	(rtx_reader::rtx_reader): Add new "compact" param.
	(rtx_reader::read_rtx_operand): Make virtual and convert return
	type from void to rtx.
	(rtx_reader::read_until): New decl.
	(rtx_reader::handle_any_trailing_information): New virtual
	function.
	(rtx_reader::postprocess): New virtual function.
	(rtx_reader::finalize_string): New virtual function.
	(rtx_reader::m_in_call_function_usage): New field.
	(rtx_reader::m_reuse_rtx_by_id): New field.
	* read-rtl-function.c: New file.
	* selftest-rtl.c (selftest::assert_rtx_ptr_eq_at): New function.
	* selftest-rtl.h (ASSERT_RTX_PTR_EQ): New macro.
	(selftest::verify_three_block_rtl_cfg): New decl.
	* read-rtl-function.h: New file.
	* read-rtl.c: Potentially include config.h rather than bconfig.h.
	For host, include function.h, memmodel.h, and emit-rtl.h.
	(one_time_initialization): New function.
	(struct compact_insn_name): New struct.
	(compact_insn_names): New array.
	(find_code): Handle insn codes in compact dumps.
	(apply_subst_iterator): Wrap with #ifdef GENERATOR_FILE.
	(bind_subst_iter_and_attr): Likewise.
	(add_condition_to_string): Likewise.
	(add_condition_to_rtx): Likewise.
	(apply_attribute_uses): Likewise.
	(add_current_iterators): Likewise.
	(apply_iterators): Likewise.
	(initialize_iterators): Guard usage of apply_subst_iterator with
	#ifdef GENERATOR_FILE.
	(read_conditions): Wrap with #ifdef GENERATOR_FILE.
	(md_reader::read_mapping): Likewise.
	(add_define_attr_for_define_subst): Likewise.
	(add_define_subst_attr): Likewise.
	(read_subst_mapping): Likewise.
	(check_code_iterator): Likewise.
	(rtx_reader::read_rtx): Likewise.  Move one-time initialization
	logic to...
	(one_time_initialization): New function.
	(rtx_reader::read_until): New method.
	(read_flags): New function.
	(parse_reg_note_name): New function.
	(rtx_reader::read_rtx_code): Initialize "iterator" to NULL.
	Handle reuse_rtx ids.
	Wrap iterator lookup within #ifdef GENERATOR_FILE.
	Add parsing support for RTL dumps, mirroring the special-cases in
	print_rtx, by calling read_flags, reading REG_NOTE names, INSN_UID
	values, and calling handle_any_trailing_information.
	(rtx_reader::read_rtx_operand): Convert return type from void
	to rtx, returning return_rtx.  Handle case 'e'.  Call
	finalize_string on XSTR and XTMPL fields.
	(rtx_reader::read_nested_rtx):  Handle dumps in which trailing
	 "(nil)" values were omitted.  Call the postprocess vfunc on the
	return_rtx.
	(rtx_reader::rtx_reader): Add new "compact" param and pass to base
	class ctor.  Initialize m_in_call_function_usage.  Call
	one_time_initialization.
	* rtl-tests.c (selftest::test_uncond_jump): Call
	set_new_first_and_last_insn.
	* rtl.h (read_rtx): Wrap decl with #ifdef GENERATOR_FILE.
	* selftest-rtl.c: New file.
	* selftest-rtl.h (class selftest::rtl_dump_test): New class.
	(selftest::get_insn_by_uid): New decl.
	* selftest-run-tests.c (selftest::run_tests): Call
	read_rtl_function_c_tests.
	* selftest.h  (selftest::read_rtl_function_c_tests): New decl.
	* tree-dfa.c (ssa_default_def): Return NULL_TREE for rtl function
	dumps.

gcc/testsuite/ChangeLog:
	* selftests/asr_div1.rtl: New file.
	* selftests/aarch64: New subdirectory.
	* selftests/aarch64/times-two.rtl: New file.
	* selftests/bb-index.rtl: New file.
	* selftests/cfg-test.rtl: New file.
	* selftests/const-int.rtl: New file.
	* selftests/example-labels.rtl: New file.
	* selftests/insn-with-mode.rtl: New file.
	* selftests/jump-to-label-ref.rtl: New file.
	* selftests/jump-to-return.rtl: New file.
	* selftests/jump-to-simple-return.rtl: New file.
	* selftests/mem.rtl: New file.
	* selftests/note-insn-deleted.rtl: New file.
	* selftests/note_insn_basic_block.rtl: New file.
	* selftests/simple-cse.rtl: New file.
	* selftests/symbol-ref.rtl: New file.
	* selftests/x86_64: New subdirectory.
	* selftests/x86_64/call-insn.rtl: New file.
	* selftests/x86_64/copy-hard-reg-into-frame.rtl: New file.
	* selftests/x86_64/times-two.rtl: New file.
	* selftests/x86_64/unspec.rtl: New file.

From-SVN: r244110

From-SVN: r244109

	* config/i386/i386.md (*testqi_ext_3): No need to handle memory
	operands in a special way.  Assert that pos+len <= mode precision.

From-SVN: r244108

	* include/bits/std_function.h (function::_Signature_type): Remove.
	(function::function(_Functor)): Adjust.

From-SVN: r244107

	* common.opt (fvect-cost-model): Remove RejectNegative flag, use
	3 argument Alias with unlimited for the negative form.
	(fno-vect-cost-model): Removed.

From-SVN: r244106

2017-01-05  Martin Liska  <mliska@suse.cz>

	* hsa-gen.c (gen_hsa_divmod): New function.
	(gen_hsa_insn_for_internal_fn_call): Use the function
	for IFN_DIVMOD.

From-SVN: r244104

2017-01-05  Martin Liska  <mliska@suse.cz>

	PR pch/78970
	* c-opts.c (c_common_post_options): Reject '-' filename for a precompiled
	header.
2017-01-05  Martin Liska  <mliska@suse.cz>

	PR pch/78970
	* gcc.c (lookup_compiler): Reject '-' filename for a precompiled
	header.

From-SVN: r244103

From-SVN: r244102

re PR c++/78765 (ICE on invalid C++ code on x86_64-linux-gnu (internal compiler error: in cp_build_addr_expr_1, at cp/typeck.c:5708))

	cp/
	PR c++/78765
	* pt.c (convert_nontype_argument): Don't try and see if integral
	or enum expressions are constants prematurely.

	testsuite/
	PR c++/78765
	* g++.dg/cpp0x/pr78765.C: New.

From-SVN: r244101

These were provided by Dominik to check more of the corner case in our
memset/memcpy inline code.

gcc/testsuite/ChangeLog:

2017-01-05  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	* gcc.target/s390/memcpy-2.c: New test.
	* gcc.target/s390/memset-2.c: New test.

From-SVN: r244099

See the memset unrolling patch.  The very same applies to memcpys with
constant lengths.

2017-01-05  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* config/s390/s390.c (s390_expand_movmem): Unroll MVC loop for
	small constant length operands.

gcc/testsuite/ChangeLog:

2017-01-05  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* gcc.target/s390/memcpy-1.c: New test.

From-SVN: r244098

 lengths.

When expanding a memset we emit a loop of MVCs/XCs instructions dealing
with 256 byte blocks.  This loop used to get unrolled with older GCCs
when using constant length operands.  GCC lost this ability probably
when more of the loop unrolling stuff has been moved to tree level.

With this patch the unrolling is done manually when emitting the RTL
insns.

2017-01-05  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* gcc.target/s390/memset-1.c: New test.

gcc/ChangeLog:

2017-01-05  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* config/s390/s390.c (s390_expand_setmem): Unroll the loop for
	small constant length operands.

From-SVN: r244097

A memset with a value != 0 is currently implemented using the mvc
instruction propagating the first byte through 256 byte blocks.  While
for the first mvc the byte is written with a separate instruction
subsequent MVCs used the last byte of the previous 256 byte block.

Starting with z13 this causes a major performance degradation.  With
this patch we always set the first byte with an mvi or stc in order to
avoid the overlapping of the MVC operands between loop iterations.

On older machines this basically makes no measurable difference so the
patch enables the new behavior for all machine levels in order to make
sure that code built for older machine levels runs well when moved to
a z13.

Bootstrapped and regression tested on s390 and s390x using z900 and z13
as default -march level. No regressions.

gcc/ChangeLog:

2017-01-05  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	* config/s390/s390.c (s390_expand_setmem): Avoid overlapping bytes
	between loop iterations.

From-SVN: r244096

2017-01-05  Martin Liska  <mliska@suse.cz>

	PR sanitizer/78815
	* gimplify.c (gimplify_decl_expr): Compare to
	asan_poisoned_variables instread of checking flags.
	(gimplify_target_expr): Likewise.
	(gimplify_expr): Likewise.
	(gimplify_function_tree): Conditionally initialize
	asan_poisoned_variables.

From-SVN: r244095

2017-01-05  Martin Liska  <mliska@suse.cz>

	* vimrc: Update indentation definition.

From-SVN: r244094

re PR rtl-optimization/78812 (Wrong code generation due to hoisting memory load across function call)

	PR tree-optimizatin/78812
	* rtl.h (contains_mem_rtx_p): Prototype.
	* ifcvt.c (containts_mem_rtx_p): Move from here to...
	* rtlanal.c (contains_mem_rtx_p): Here and remvoe static linkage.
	* gcse.c (prune_expressions): Use contains_mem_rtx_p to discover
	and prune MEMs that are not at the toplevel of a SET_SRC rtx.  Look
	through ZERO_EXTEND and SIGN_EXTEND when trying to avoid pruning
	MEMs.

	PR tree-optimization/78812
	* g++.dg/torture/pr78812.C: New test.

From-SVN: r244093

2017-01-05  Tim Shen  <timshen@google.com>

	PR libstdc++/78996
	* include/std/variant (__gen_vtable_impl): rename __unused to
	__dimensions to avoid naming conflict.

From-SVN: r244092

Building with the bootstrap-O3 configuration option fails to compile
input.c due to an AFAICT false-positive warning about an uninitialized
use of a variable.

This patch adds a default initializer to silence it.

for  gcc/ChangeLog

	* input.c (assert_char_at_range): Default-initialize
	actual_range.

From-SVN: r244091

This patch fixes a false-positive warning in df-scan, at bootstrap-O3
failed, and enables GCC to optimize out the code that leads to the
warning.

df_ref_create_structure was inlined into the else part of
df_ref_record.  Due to the condition of the corresponding if, In the
else part, VRP deduced unsigned regno >= FIRST_PSEUDO_REGISTER.

In df_ref_create_structure, there's another regno variable,
initialized with the same expression and value as the caller's.  GCC
can tell as much, but this regno variable is signed.  It is used,
shifted right, to index a hard regset bit array within a path that
tests that this signed regno < FIRST_PSEUDO_REGISTER.

GCC warned about the possible out-of-range indexing into the hard
regset array.  It shouldn't, after all, the same regno can't possibly
be both < FIRST_PSEUDO_REGISTER and >= FIRST_PSEUDO_REGISTER, can it?

Well, the optimizers correctly decide it could, if it was a negative
int that, when converted to unsigned, became larger than
FIRST_PSEUDO_REGISTER.  But GCC doesn't know regno can't be negative,
so the test could not be optimize out.  What's more, given the
constraints, VRP correctly concluded the hard regset array would
always be indexed by a value way outside the array index range.

This patch changes the inlined regno to unsigned, like the caller's,
so that we can now tell the conditions can't both hold, so we optimize
out the path containing the would-be out-of-range array indexing.

for  gcc/ChangeLog

	* df-scan.c (df_ref_create_structure): Make regno unsigned,
	to match the caller.

From-SVN: r244090

A debug insn after the final jump of a basic block may cause the
expander to emit a dummy move where the non-debug compile won't
because it finds the jump insn at the end of the insn stream.

Fix the condition so that, instead of requiring the jump as the last
insn, it also matches a jump followed by debug insns.

This fixes the compilation of libgcc/libgcov-profiler.c with
-fcompare-debug on i686-linux-gnu.

for  gcc/ChangeLog

	* cfgexpand.c (expand_gimple_basic_block): Disregard debug
	insns after final jump in test to emit dummy move.

From-SVN: r244089

Various Ada RTS files failed -fcompare-debug compilation because debug
stmts prevented EH cleanups from taking place.  Adjusting
cleanup_empty_eh to skip them fixes it.

for  gcc/ChangeLog

	* gimple-iterator.h (gsi_one_nondebug_before_end_p): New.
	* tree-eh.c (cleanup_empty_eh): Skip more debug stmts.

From-SVN: r244088

Building with the bootstrap-O3 configuration option fails to compile
fortran/module.c due to an AFAICT false-positive warning about an
uninitialized use of a variable.

This patch adds a dummy initializer to silence it.

for  gcc/fortran/ChangeLog

	* module.c (load_omp_udrs): Initialize name.

From-SVN: r244087

Building with the bootstrap-O1 configuration option fails to compile a
number of files due to AFAICT false-positive warnings about uses of
uninitialized variables.

This patch adds dummy initializers to silence them all.

for  gcc/ChangeLog

	* multiple_target.c (create_dispatcher_calls): Init e_next.
	* tree-ssa-loop-split.c (split_loop): Init border.
	* tree-vect-loop.c (vect_determine_vectorization_factor): Init
	scalar_type.

From-SVN: r244086

From-SVN: r244085

[gcc]
2017-01-04  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/71977
	PR target/70568
	PR target/78823
	* config/rs6000/predicates.md (sf_subreg_operand): New predicate.
	(altivec_register_operand): Do not return true if the operand
	contains a SUBREG mixing SImode and SFmode.
	(vsx_register_operand): Likewise.
	(vsx_reg_sfsubreg_ok): New predicate.
	(vfloat_operand): Do not return true if the operand contains a
	SUBREG mixing SImode and SFmode.
	(vint_operand): Likewise.
	(vlogical_operand): Likewise.
	(gpc_reg_operand): Likewise.
	(int_reg_operand): Likewise.
	* config/rs6000/rs6000-protos.h (valid_sf_si_move): Add
	declaration.
	* config/rs6000/rs6000.c (valid_sf_si_move): New function to
	determine if a MOVSI or MOVSF operation contains SUBREGs that mix
	SImode and SFmode.
	(rs6000_emit_move_si_sf_subreg): New helper function.
	(rs6000_emit_move): Call rs6000_emit_move_si_sf_subreg to possbily
	fixup SUBREGs involving SImode and SFmode.
	* config/rs6000/vsx.md (SFBOOL_*): New constants that are operand
	numbers for the new peephole2 optimization.
	(peephole2 for SFmode unions): New peephole2 to optimize cases in
	the GLIBC math library that do AND/IOR/XOR operations on single
	precision floating point.
	* config/rs6000/rs6000.h (TARGET_NO_SF_SUBREG): New internal
	target macros to say whether we need to avoid SUBREGs mixing
	SImode and SFmode.
	(TARGET_ALLOW_SF_SUBREG): Likewise.
	* config/rs6000/rs6000.md (UNSPEC_SF_FROM_SI): New unspecs.
	(UNSPEC_SI_FROM_SF): Likewise.
	(iorxor): Change spacing.
	(and_ior_xor): New iterator for AND, IOR, and XOR.
	(movsi_from_sf): New insns for SImode/SFmode SUBREG support.
	(movdi_from_sf_zero_ext): Likewise.
	(mov<mode>_hardfloat, FMOVE32 iterator): Use register_operand
	instead of gpc_reg_operand.  Add SImode/SFmode SUBREG support.
	(movsf_from_si): New insn for SImode/SFmode SUBREG support.
	(fma<mode>4): Use gpc_reg_operand instead of register_operand.
	(fms<mode>4): Likewise.
	(fnma<mode>4): Likewise.
	(fnms<mode>4): Likewise.
	(nfma<mode>4): Likewise.
	(nfms<mode>4): Likewise.

[gcc/testsuite]
2017-01-04  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/71977
	PR target/70568
	PR target/78823
	* gcc.target/powerpc/pr71977-1.c: New tests to check whether on
	64-bit VSX systems with direct move, whether we optimize common
	code sequences in the GLIBC math library for float math functions.
	* gcc.target/powerpc/pr71977-2.c: Likewise.

From-SVN: r244084