From-SVN: r273467

2019-07-15  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	PR target/90723
	* recog.h (temporary_volatile_ok): New class.
	* config/aarch64/aarch64.c (aarch64_emit_sve_pred_move): Set
	volatile_ok temporarily to true using temporary_volatile_ok.
	* expr.c (emit_block_move_via_cpymem): Likewise.
	* optabs.c (maybe_legitimize_operand): Likewise.

From-SVN: r273466

re PR c/91149 (GCC 9 and later incorrectly rejects OpenMP task reduction-modifier on target parallel combined construct)

	PR c/91149
	* c-omp.c (c_omp_split_clauses): Fix a pasto in
	OMP_CLAUSE_REDUCTION_TASK handling.

	* c-c++-common/gomp/reduction-task-3.c: New test.

From-SVN: r273465

	* gimplify.c (struct gimplify_omp_ctx): Add order_concurrent member.
	(omp_notice_threadprivate_variable): Diagnose threadprivate variable
	uses inside of order(concurrent) constructs.
	(gimplify_scan_omp_clauses): Set ctx->order_concurrent if
	OMP_CLAUSE_ORDER is seen.
	* omp-low.c (struct omp_context): Add order_concurrent member.
	(scan_sharing_clauses): Set ctx->order_concurrent if
	OMP_CLAUSE_ORDER is seen.
	(check_omp_nesting_restrictions): Diagnose ordered or atomic inside
	of simd order(concurrent).  Diagnose constructs not allowed inside of
	for order(concurrent).
	(setjmp_or_longjmp_p): Add a context and TREE_PUBLIC check to avoid
	complaining about static double setjmp (double); or class static
	methods or non-global namespace setjmps.
	(omp_runtime_api_call): New function.
	(scan_omp_1_stmt): Diagnose OpenMP runtime API calls inside of
	order(concurrent) loops.

	* c-c++-common/gomp/order-3.c: New test.
	* c-c++-common/gomp/order-4.c: New test.

From-SVN: r273464

From-SVN: r273463

The test case has a typo in the big endian section that reversed two digits.

Fix committed as obvious.


2019-07-12  Bill Seurer  <seurer@linux.vnet.ibm.com>

	* gcc.dg/tree-ssa/vector-7.c: Fix typo.

From-SVN: r273459

During GCC-9, the codegen for unreachable switch case statements changed
such that the (undefined) behaviour of reaching such statements is directed
to one of the existing switch cases.  This means that the testcase which
deals with the old behaviour can no longer work (and there is nothing to test
with it).  The [Darwin-specific] test is now redundant and can be removed.

gcc/testsuite/

2019-07-12  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.dg/pr57438-2.c: Remove.

From-SVN: r273457

gcc/ChangeLog:

	* doc/invoke.texi (ssa-name-def-chain-limit): Document new --param.
	* params.def (PARAM_SSA_NAME_DEF_CHAIN_LIMIT): Add new --param.
	* tree-vrp.c (vrp_prop::check_mem_ref): Use
	PARAM_SSA_NAME_DEF_CHAIN_LIMIT.

gcc/testsuite/ChangeLog:

	* gcc.dg/Warray-bounds-43.c: New test.

From-SVN: r273454

	* tree-ssa-alias.c (same_tmr_indexing_p): Break out from ...
	(indirect_refs_may_alias_p): ... here.
	(nonoverlapping_component_refs_since_match_p): Support also non-trivial
	mem refs in the access paths.

	* gcc.dg/tree-ssa/alias-access-path-9.c: New testcase.

From-SVN: r273451

2019-07-12  Jiangning Liu  <jiangning.liu@amperecomputing.com>

	PR tree-optimization/89430
	* tree-ssa-phiopt.c (cond_store_replacement): Support conditional
	store elimination for local variable without address escape.

	PR tree-optimization/89430
	* gcc.dg/tree-ssa/pr89430-1.c: New test.
	* gcc.dg/tree-ssa/pr89430-2.c: New test.
	* gcc.dg/tree-ssa/pr89430-3.c: New test.
	* gcc.dg/tree-ssa/pr89430-4.c: New test.
	* gcc.dg/tree-ssa/pr89430-5.c: New test.
	* gcc.dg/tree-ssa/pr89430-6.c: New test.

From-SVN: r273449

	* testsuite/29_atomics/atomic_float/1.cc: Fix comment.

From-SVN: r273448

	* config/c6x/c6x.c (c6x_section_type): Clear SECTION_NOTYPE
	for the ".far" section.

From-SVN: r273447

re PR tree-optimization/91145 (ICE: in vect_build_slp_tree_2, at tree-vect-slp.c:1143 with -march=skylake-avx512 -O3)

2019-07-12  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91145
	* tree-vect-slp.c (vect_build_slp_tree_2): Fix reduction
	chain check.

	* gcc.dg/torture/pr91145.c: New testcase.

From-SVN: r273445

The only preexisting use of GIMPLE_EH_ELSE, for transactional memory
commits, did not allow exceptions to escape from the ELSE path.  The
trick it uses to allow the ELSE path to see the propagating exception
does not work very well if the exception cleanup raises further
exceptions: the ELSE block is configured to handle exceptions in
itself.  This confuses the heck out of CFG and EH cleanups.

Basing the lowering context for the ELSE block on outer_state, rather
than this_state, gets us the expected enclosing handler.


for  gcc/ChangeLog

	* tree-eh.c (honor_protect_cleanup_actions): Use outer_
	rather than this_state as the lowering context for the ELSE
	seq in a GIMPLE_EH_ELSE.

for  gcc/testsuite/ChangeLog

	* gcc.dg/gimplefe-44.c: New.

From-SVN: r273444

for  gcc/c/ChangeLog

	* gimple-parser.c (c_parser_gimple_try_stmt): New.
	(c_parser_compound_statement): Call it.

for  gcc/testsuite/ChangeLog

	* gcc.dg/gimplefe-43.c: New.

From-SVN: r273443

This defines the equivalent of C++2a's std::type_identity_t alias but
for use in C++11 and later. This can be used to replace __detail::__idt
in the string_view headers, which previously used common_type_t because
the one argument specialization of common_type_t was simply the identity
transform (which is no longer true).

	* include/experimental/string_view (__detail::__idt): Remove.
	(operator==, operator!=, operator<, operator>, operator<=, operator>=):
	Use __type_identity_t instead of __detail::__idt;
	* include/std/string_view (__detail::__idt): Remove.
	(operator==, operator!=, operator<, operator>, operator<=, operator>=):
	Use __type_identity_t instead of __detail::__idt;
	* include/std/type_traits (__type_identity_t): New alias template.

From-SVN: r273442

	* doc/xml/manual/status_cxx2020.xml: Update status for atomic_ref
	and floating point atomics.

From-SVN: r273441

I'd made it a precondition of vector_builder::elt that the encoding
must have been fully populated and that all implicit elements are
therefore defined.  But for one of the AArch64 patches I'm working on,
it'd be convenient to be able to look back at previous elements while
building up the encoding.  This patch therefore makes the assert
specific to implicit elements only.

2019-07-12  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* vector-builder.h (vector_builder::elt): Allow already-supplied
	elements to be read back before building is complete.

From-SVN: r273440

re PR rtl-optimization/91136 (incorrect move of instruction to delay slot causes application crash in exception handling)

	PR rtl-optimization/91136
	* df-core.c (ACCESSING REFS): Fix typos in comment.
	* resource.c (mark_target_live_reg): Add artificial defs that occur at
	the beginning of the block to the initial set of live registers.

From-SVN: r273436

2019-07-12  Richard Biener  <rguenther@suse.de>

	* fold-const.h (get_array_ctor_element_at_index): Adjust.
	* fold-const.c (get_array_ctor_element_at_index): Add
	ctor_idx output parameter informing the caller where in
	the constructor the element was (not) found.  Add early exit
	for when the ctor is sorted.
	* gimple-fold.c (fold_array_ctor_reference): Support constant
	folding across multiple array elements.

	* gcc.dg/tree-ssa/vector-7.c: New testcase.

From-SVN: r273435

	* cfgexpand.c (expand_gimple_stmt_1) <GIMPLE_RETURN>: If the statement
	doesn't have location, set the current location to the function's end

From-SVN: r273434

This patch is part of a series that fixes ambiguous attribute
uses in .md files, i.e. cases in which attributes didn't use
<ITER:ATTR> to specify an iterator, and in which <ATTR> could
have different values depending on the iterator chosen.

No behavioural change except for dropping the unused SVE
divide permutations.

2019-07-12  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/aarch64.md (*compare_condjump<mode>)
	(loadwb_pair<GPI:mode>_<P:mode>, loadwb_pair<GPF:mode>_<P:mode>)
	(storewb_pair<GPI:mode>_<P:mode>, storewb_pair<GPF:mode>_<P:mode>)
	(*ands<mode>_compare0): Fix ambiguous uses of .md attributes.
	* config/aarch64/aarch64-simd.md
	(*aarch64_get_lane_extend<GPI:mode><VDQQH:mode>): Likewise.
	(*aarch64_get_lane_zero_extend<GPI:mode><VDQQH:mode>): Likewise.
	* config/aarch64/aarch64-sve.md
	(while_ult<GPI:mode><PRED_ALL:mode>): Likewise.
	(*cond_<optab><mode>_any): Fix SVE_I/SVE_SDI typo.

From-SVN: r273433

This patch extends the support for "@..." pattern names so that
the patterns can have different numbers of operands.  This allows
things like binary and ternary operations to be handled in a
consistent way, a bit like optabs.  The generators assert that
the number of operands passed is correct for the underlying
instruction.

Also, replace_operands_with_dups iterated over the old rtx format
even after having decided to do a replacement, which broke with
match_operator.

2019-07-12  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* doc/md.texi: Document that @ patterns can have different
	numbers of operands.
	* genemit.c (handle_overloaded_gen): Handle this case.
	* genopinit.c (handle_overloaded_gen): Likewise.
	* gensupport.c (replace_operands_with_dups): Iterate over
	the new rtx's format rather than the old one's.

From-SVN: r273432

	* tree-core.h (enum omp_clause_code): Add OMP_CLAUSE_ORDER.
	* tree.c (omp_clause_num_ops, omp_clause_code_name): Add
	order clause entries.
	(walk_tree_1): Handle OMP_CLAUSE_ORDER.
	* tree-pretty-print.c (dump_omp_clause): Likewise.
	* gimplify.c (gimplify_scan_omp_clauses, gimplify_adjust_omp_clauses):
	Likewise.
	* omp-low.c (scan_sharing_clauses): Likewise.
	* tree-nested.c (convert_nonlocal_omp_clauses,
	convert_local_omp_clauses): Likewise.
c-family/
	* c-pragma.h (enum pragma_omp_clause): Add PRAGMA_OMP_CLAUSE_ORDER.
	* c-omp.c (c_omp_split_clauses): Handle splitting of OMP_CLAUSE_ORDER.
c/
	* c-parser.c (c_parser_omp_clause_name): Handle order clause.
	(c_parser_omp_clause_order): New function.
	(c_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_ORDER.
	(OMP_SIMD_CLAUSE_MASK, OMP_FOR_CLAUSE_MASK): Add
	PRAGMA_OMP_CLAUSE_ORDER.
	* c-typeck.c (c_finish_omp_clauses): Handle OMP_CLAUSE_ORDER.
cp/
	* parser.c (cp_parser_omp_clause_name): Handle order clause.
	(cp_parser_omp_clause_order): New function.
	(cp_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_ORDER.
	(OMP_SIMD_CLAUSE_MASK, OMP_FOR_CLAUSE_MASK): Add
	PRAGMA_OMP_CLAUSE_ORDER.
	* semantics.c (finish_omp_clauses): Handle OMP_CLAUSE_ORDER.
	* pt.c (tsubst_omp_clauses): Likewise.
testsuite/
	* c-c++-common/gomp/order-1.c: New test.
	* c-c++-common/gomp/order-2.c: New test.

From-SVN: r273431

placed closely next.

2019-07-12  Kewen Lin  <linkw@gcc.gnu.org>

    * gcc/cfgrtl.c (print_rtl_with_bb): Emit a hint if the
    fallthrough target of current basic block isn't the placed
    right next.

From-SVN: r273430

From-SVN: r273429

    
    The type hash and equality functions are generated after the
    order_evaluations pass. They may contain shortcut operators and
    Set_and_use_temporary_expressions (e.g. from lowering a
    Binary_exprssion) that need to be ordered. Run order_evaluations
    and remove_shortcuts on these functions. (The hash functions
    may be fine, but to be on the safe side we run on them anyway.
    We do need to run on the equality functions.)
    
    A Set_and_use_temporary_expression is effectively an assignment,
    so it needs to be ordered. Otherwise if we insert a temporary
    statement before it, we may get wrong evaluation order.
    
    A test case is CL 185818.
    
    Fixes golang/go#33062.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/185817

From-SVN: r273425

	* ChangeLog: Fix whitespace.
	* testsuite/ChangeLog: Ditto.

From-SVN: r273424

	* doc/xml/manual/configure.xml: Improve documentation of
	--enable-libstdcxx-time option.

From-SVN: r273421

This adds the new atomic types from C++2a, as proposed by P0019 and
P0020. To reduce duplication the calls to the compiler's atomic
built-ins are wrapped in new functions in the __atomic_impl namespace.
These functions are currently only used by std::atomic<floating-point>
and std::atomic_ref but could also be used for all other specializations
of std::atomic.

	* include/bits/atomic_base.h (__atomic_impl): New namespace for
	wrappers around atomic built-ins.
	(__atomic_float, __atomic_ref): New class templates for use as base
	classes.
	* include/std/atomic (atomic<float>, atomic<double>)
	(atomic<long double>): New explicit specializations.
	(atomic_ref): New class template.
	(__cpp_lib_atomic_ref): Define.
	* include/std/version (__cpp_lib_atomic_ref): Define.
	* testsuite/29_atomics/atomic/60695.cc: Adjust dg-error.
    	* testsuite/29_atomics/atomic_float/1.cc: New test.
    	* testsuite/29_atomics/atomic_float/requirements.cc: New test.
    	* testsuite/29_atomics/atomic_ref/deduction.cc: New test.
    	* testsuite/29_atomics/atomic_ref/float.cc: New test.
    	* testsuite/29_atomics/atomic_ref/generic.cc: New test.
    	* testsuite/29_atomics/atomic_ref/integral.cc: New test.
    	* testsuite/29_atomics/atomic_ref/pointer.cc: New test.
    	* testsuite/29_atomics/atomic_ref/requirements.cc: New test.

From-SVN: r273420

__m512i _mm512_loadu_epi64( void * sa);
void _mm512_storeu_epi64(void * d, __m512i a);
__m512i _mm512_loadu_epi32( void * sa);
void _mm512_storeu_epi32(void * d, __m512i a);
void _mm256_storeu_epi64(void * d, __m256i a);
void _mm_storeu_epi64(void * d, __m128i a);
void _mm256_storeu_epi32(void * d, __m256i a);
void _mm_storeu_epi32(void * d, __m128i a);

Tested on x86-64.

2019-07-11  Sunil K Pandey  <sunil.k.pandey@intel.com>

gcc/

	PR target/90980
	* config/i386/avx512fintrin.h (_mm512_loadu_epi64): New.
	(_mm512_storeu_epi64): Likewise.
	(_mm512_loadu_epi32): Likewise.
	(_mm512_storeu_epi32): Likewise.
	* config/i386/avx512vlintrin.h (_mm256_storeu_epi64): New.
	(_mm_storeu_epi64): Likewise.
	(_mm256_storeu_epi32): Likewise.
	(_mm_storeu_epi32): Likewise.

gcc/testsuite/

	PR target/90980
	* gcc.target/i386/pr90980-1.c: New test.
	* gcc.target/i386/pr90980-2.c: Likewise.
	* gcc.target/i386/pr90980-3.c: Likewise.

From-SVN: r273416

	* config/rs6000/rs6000-logue.c: Add Modula-2 to comment.

From-SVN: r273413

This patch recognises Modula-2 as language for the traceback table,
fixing the problem shown in
https://gcc.gnu.org/ml/gcc-patches/2019-07/msg00848.html .


	* config/rs6000/rs6000-logue.c (rs6000_output_function_epilogue):
	Handle Modula-2.

From-SVN: r273411

	PR target/91124
	* config/i386/sse.md (sse2_cvtpd2dq<mask_name>): Change into ...
	(sse2_cvtpd2dq): ... this.  Remove mask substitution macros.
	(sse2_cvtpd2dq_mask, sse2_cvtpd2dq_mask_1): New define_insns.
	(ufix_notruncv2dfv2si2<mask_name>): Change into ...
	(ufix_notruncv2dfv2si2): ... this.  Remove mask substitution macros.
	(ufix_notruncv2dfv2si2_mask, ufix_notruncv2dfv2si2_mask_1): New
	define_insns.
	(ufix_truncv2dfv2si2<mask_name>): Change into ...
	(ufix_truncv2dfv2si2): ... this.  Remove mask substitution macros.
	(ufix_truncv2dfv2si2_mask, ufix_truncv2dfv2si2_mask_1): New
	define_insns.
	(sse2_cvttpd2dq<mask_name>): Change into ...
	(sse2_cvttpd2dq): ... this.  Remove mask substitution macros.
	(sse2_cvttpd2dq_mask, sse2_cvttpd2dq_mask_1): New define_insns.
	(*sse2_cvtpd2dq<mask_name>): Change into ...
	(*sse2_cvtpd2dq): ... this.  Remove mask substitution macros.
	Add "C" constraint to const0_operand.
	(*sse2_cvtpd2dq_mask, *sse2_cvtpd2dq_mask_1): New define_insns.
	(sse2_cvtpd2ps_mask): Adjust expand to match *sse2_cvtpd2ps_mask
	changes.

From-SVN: r273409

	PR target/91124
	* config/i386/i386-builtin-types.def
	(V32HI_FTYPE_V32HI_V32HI_V32HI_INT,
	V16HI_FTYPE_V16HI_V16HI_V16HI_INT, V8HI_FTYPE_V8HI_V8HI_V8HI_INT,
	V8SI_FTYPE_V8SI_V8SI_V8SI_INT, V4DI_FTYPE_V4DI_V4DI_V4DI_INT,
	V8DI_FTYPE_V8DI_V8DI_V8DI_INT, V16SI_FTYPE_V16SI_V16SI_V16SI_INT,
	V2DI_FTYPE_V2DI_V2DI_V2DI_INT, V4SI_FTYPE_V4SI_V4SI_V4SI_INT): Remove.
	* config/i386/i386-builtin.def (__builtin_ia32_vpshrdv_v32hi_mask,
	__builtin_ia32_vpshrdv_v32hi_maskz, __builtin_ia32_vpshrdv_v16hi_mask,
	__builtin_ia32_vpshrdv_v16hi_maskz, __builtin_ia32_vpshrdv_v8hi_mask,
	__builtin_ia32_vpshrdv_v8hi_maskz, __builtin_ia32_vpshrdv_v16si_mask,
	__builtin_ia32_vpshrdv_v16si_maskz, __builtin_ia32_vpshrdv_v8si_mask,
	__builtin_ia32_vpshrdv_v8si_maskz, __builtin_ia32_vpshrdv_v4si_mask,
	__builtin_ia32_vpshrdv_v4si_maskz, __builtin_ia32_vpshrdv_v8di_mask,
	__builtin_ia32_vpshrdv_v8di_maskz, __builtin_ia32_vpshrdv_v4di_mask,
	__builtin_ia32_vpshrdv_v4di_maskz, __builtin_ia32_vpshrdv_v2di_mask,
	__builtin_ia32_vpshrdv_v2di_maskz, __builtin_ia32_vpshldv_v32hi_mask,
	__builtin_ia32_vpshldv_v32hi_maskz, __builtin_ia32_vpshldv_v16hi_mask,
	__builtin_ia32_vpshldv_v16hi_maskz, __builtin_ia32_vpshldv_v8hi_mask,
	__builtin_ia32_vpshldv_v8hi_maskz, __builtin_ia32_vpshldv_v16si_mask,
	__builtin_ia32_vpshldv_v16si_maskz, __builtin_ia32_vpshldv_v8si_mask,
	__builtin_ia32_vpshldv_v8si_maskz, __builtin_ia32_vpshldv_v4si_mask,
	__builtin_ia32_vpshldv_v4si_maskz, __builtin_ia32_vpshldv_v8di_mask,
	__builtin_ia32_vpshldv_v8di_maskz, __builtin_ia32_vpshldv_v4di_mask,
	__builtin_ia32_vpshldv_v4di_maskz, __builtin_ia32_vpshldv_v2di_mask,
	__builtin_ia32_vpshldv_v2di_maskz, __builtin_ia32_vpdpbusd_v16si_mask,
	__builtin_ia32_vpdpbusd_v16si_maskz, __builtin_ia32_vpdpbusd_v8si_mask,
	__builtin_ia32_vpdpbusd_v8si_maskz, __builtin_ia32_vpdpbusd_v4si_mask,
	__builtin_ia32_vpdpbusd_v4si_maskz,
	__builtin_ia32_vpdpbusds_v16si_mask,
	__builtin_ia32_vpdpbusds_v16si_maskz,
	__builtin_ia32_vpdpbusds_v8si_mask,
	__builtin_ia32_vpdpbusds_v8si_maskz,
	__builtin_ia32_vpdpbusds_v4si_mask,
	__builtin_ia32_vpdpbusds_v4si_maskz,
	__builtin_ia32_vpdpwssd_v16si_mask,
	__builtin_ia32_vpdpwssd_v16si_maskz, __builtin_ia32_vpdpwssd_v8si_mask,
	__builtin_ia32_vpdpwssd_v8si_maskz, __builtin_ia32_vpdpwssd_v4si_mask,
	__builtin_ia32_vpdpwssd_v4si_maskz,
	__builtin_ia32_vpdpwssds_v16si_mask,
	__builtin_ia32_vpdpwssds_v16si_maskz,
	__builtin_ia32_vpdpwssds_v8si_mask,
	__builtin_ia32_vpdpwssds_v8si_maskz,
	__builtin_ia32_vpdpwssds_v4si_mask,
	__builtin_ia32_vpdpwssds_v4si_maskz): Use *_USI, *_UHI or *_UQI
	suffixed types rather than *_INT.
	* config/i386/i386-expand.c (ix86_expand_args_builtin): Don't handle
	V32HI_FTYPE_V32HI_V32HI_V32HI_INT, V16HI_FTYPE_V16HI_V16HI_V16HI_INT,
	V8HI_FTYPE_V8HI_V8HI_V8HI_INT, V8SI_FTYPE_V8SI_V8SI_V8SI_INT,
	V4DI_FTYPE_V4DI_V4DI_V4DI_INT, V8DI_FTYPE_V8DI_V8DI_V8DI_INT,
	V16SI_FTYPE_V16SI_V16SI_V16SI_INT, V2DI_FTYPE_V2DI_V2DI_V2DI_INT
	and V4SI_FTYPE_V4SI_V4SI_V4SI_INT.

From-SVN: r273408

2019-07-11  Piotr Trojanek  <trojanek@adacore.com>

gcc/ada/

	* lib-writ.adb (Ensure_System_Dependency,
	Up_To_Date_ALI_File_Exists, Write_ALI): Replace low-level access
	to table with a high-level query.

From-SVN: r273407

2019-07-11  Piotr Trojanek  <trojanek@adacore.com>

gcc/ada/

	* checks.adb: Fix typo in comment.
	* sem.adb (Semantics): Avoid repeated calls to
	In_Extended_Main_Source_Unit by reusing an already-cached
	result.
	* sem_util.adb (First_Global): Fix style.

From-SVN: r273406

In the special GNATprove mode of the frontend, automatic inlining is
performed, which may lead to spurious errors on dimensionality checking.
Avoid performing this checking on inlined code, which has already been
checked for dimensionality errors.

There is no impact on compilation.

2019-07-11  Yannick Moy  <moy@adacore.com>

gcc/ada/

	* sem_res.adb (Resolve_Call): Do not perform dimensionality
	checking on inlined bodies.

From-SVN: r273405

2019-07-11  Yannick Moy  <moy@adacore.com>

gcc/ada/

	* debug.adb: Flip meaning of debug switch -gnatdF.

From-SVN: r273404

When the Loop_Entry attribute is used inside a loop invariant or another
assertion where it is allowed, it may lead to spurious warnings on
conditions that are detected to be always valid. Now fixed.

2019-07-11  Yannick Moy  <moy@adacore.com>

gcc/ada/

	* sem_eval.adb (Is_Same_Value): Add special case for rewritten
	Loop_Entry attribute.

gcc/testsuite/

	* gnat.dg/loop_entry1.adb: New testcase.

From-SVN: r273403