I mistyped the PR number in the actual fix commit
r10-7682-g0666767e.

The expansions for await expressions were specific to particular
cases, this revises it to be more generic.

a: Revise co_await statement walkers.

We want to process the co_awaits one statement at a time.
We also want to be able to determine the insertion points for
new bind scopes needed to cater for temporaries that are
captured by reference and have lifetimes that need extension
to the end of the full expression.  Likewise, the handling of
captured references in the evaluation of conditions might
result in the need to make a frame copy.

This reorganises the statement walking code to make it easier to
extend for these purposes.

b: Factor reference-captured temp code.

We want to be able to use the code that writes a new bind expr
with vars (and their initializers) from several places, so split
that out of the maybe_promote_captured_temps() function into a
new replace_statement_captures ().  Update some comments.

c: Generalize await statement expansion.

This revises the expansion to avoid the need to expand conditionally
on the tree type.  It resolves PR 94528.

gcc/cp/ChangeLog:

2020-04-10  Iain Sandoe  <iain@sandoe.co.uk>

	PR c++/94538
	* coroutines.cc (co_await_expander): Remove.
	(expand_one_await_expression): New.
	(process_one_statement): New.
	(await_statement_expander): New.
	(build_actor_fn): Revise to use per-statement expander.
	(struct susp_frame_data): Reorder and comment.
	(register_awaits): Factor code.
	(replace_statement_captures): New, factored from...
	(maybe_promote_captured_temps):.. here.
	(await_statement_walker): Revise to process per statement.
	(morph_fn_to_coro): Use revised susp_frame_data layout.

gcc/testsuite/ChangeLog:

2020-04-10  Iain Sandoe  <iain@sandoe.co.uk>

	PR c++/94538
	* g++.dg/coroutines/pr94528.C: New test.

In C++20 this is well-formed:

  using T = int[2];
  T t(1, 2);

which means that std::is_constructible_v<int[2], int, int> should be true.
But constructible_expr immediately returned the error_mark_node when it
saw a list with more than one element.  To give accurate results in
C++20, we have to try initializing the aggregate from a parenthesized list of
values.

To not repeat the same mistake as in c++/93790, if there's only one
element, I'm trying {} only when () didn't succeed.  is_constructible5.C
verifies this.

In paren-init24.C std::is_nothrow_constructible_v doesn't work due to
 error: invalid 'static_cast' from type 'int' to type 'int [1]'
and
 error: functional cast to array type 'int [2]'

This needs to be fixed in libstdc++.

	PR c++/94149
	* method.c (constructible_expr): In C++20, try using parenthesized
	initialization of aggregates to determine the result of
	__is_constructible.

	* g++.dg/cpp2a/paren-init24.C: New test.
	* g++.dg/cpp2a/paren-init25.C: New test.
	* g++.dg/ext/is_constructible5.C: New test.

2020-04-10  Fritz Reese  <foreese@gcc.gnu.org>

	* gfortran.dg/asynchronous_5.f03: Fix typo in testcase and add
	IMPLICIT NONE.

gcc/testsuite/ChangeLog:

2020-04-10  Fritz Reese  <foreese@gcc.gnu.org>

	* gfortran.dg/asynchronous_5.f03: Add -fdump-tree-original and fix
	patterns for scan-tree-dump.

	libgomp/
	PR libgomp/92843
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-1-lib.c:
	New file.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-1.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-2-lib.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-2.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-3-lib.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-3.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-4-lib.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-4.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-5-lib.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-5.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-6-lib.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-6.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-7-lib.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-7.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-8-lib.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/static-dynamic-lifetimes-8.c:
	Likewise.

Fix-up for commit 689418b9 "libgomp – fix
handling of 'target enter data'".

	libgomp/
	* testsuite/libgomp.fortran/target-enter-data-1.f90: Add 'dg-do
	run'.

... which as of PR89433 commit b48f44bf causes
an ICE.  Not sure if this is actually supposed to be valid or invalid code.
Until the interactions between OpenACC and OpenMP 'target' get defined
properly, make this a compile-time error.

	gcc/
	PR middle-end/89433
	PR middle-end/93465
	* omp-general.c (oacc_verify_routine_clauses): Diagnose if
	"#pragma omp declare target" has also been applied.
	gcc/testsuite/
	PR middle-end/89433
	PR middle-end/93465
	* c-c++-common/goacc-gomp/pr93465-1.c: New file.

As a prerequesite for PR94304, it becomes easier to manage selectively
compiling sublibraries when there's only one library to link to.

So a druntime convenience library is built to be part of phobos, however
separate druntime library is still built and installed, to allow linking
only to the core runtime explicitly, rather than pulling in the entire
standard library with it.

The gdc driver no longer generates an '-lgdruntime' option, and the
inclusion of the libdruntime library path has been removed from the
testsuite.

gcc/d/ChangeLog:

	* d-spec.cc (LIBDRUNTIME): Remove.
	(LIBDRUNTIME_PROFILE): Remove.
	(lang_specific_driver): Don't link in libgdruntime.

gcc/testsuite/ChangeLog:

	* lib/gdc.exp (gdc_link_flags): Remove libdruntime library path.

libphobos/ChangeLog:

	* d_rules.am (libdgruntime_la_LINK): Move to libdruntime/Makefile.am.
	(libgphobos_la_LINK): Move to src/Makefile.am
	* libdruntime/Makefile.am: Add libgdruntime_convenience library.
	* libdruntime/Makefile.in: Regenerate.
	* src/Makefile.am (libgphobos_la_LIBADD): Add libgdruntime_convenience
	library.
	(libgphobos_la_DEPENDENCIES): Likewise.
	* src/Makefile.in: Regenerate.
	* testsuite/lib/libphobos.exp: Remove libdruntime library paths.
	* testsuite/testsuite_flags.in: Likewise.

gcc/cp
2020-04-10  Bin Cheng  <bin.cheng@linux.alibaba.com>

    * coroutines.cc (co_await_expander): Simplify.

gcc/testsuite
2020-04-10  Bin Cheng  <bin.cheng@linux.alibaba.com>

    * g++.dg/coroutines/co-await-syntax-10.C: New test.
    * g++.dg/coroutines/co-await-syntax-11.C: New test.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/227551

A composite literal key may not have a global definition, so
Gogo::define_global_names may not see it.  In order to correctly
handle the case in which a predeclared identifier is used as a
composite literal key, do an explicit check of the global namespace.

Test case is https://golang.org/cl/227783.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/227784

2020-04-06  Fritz Reese  <foreese@gcc.gnu.org>

This patch reorganizes I/O checking code. Checks which were done in the
matching phase which do not affect the match result are moved to the
resolution phase. Checks which were duplicated in both the matching phase
and resolution phase have been reduced to one check in the resolution phase.

Another section of code which used a global async_io_dt flag to check for
and assign the asynchronous attribute to variables used in asynchronous I/O
has been simplified.

Furthermore, this patch improves error reporting and expands test coverage
of I/O tags:

 - "TAG must be an initialization expression" reported by io.c
   (check_io_constraints) is replaced with an error from expr.c
   (gfc_reduce_init_expr) indicating _why_ the expression is not a valid
   initialization expression.

 - Several distinct error messages regarding the check for scalar
   + character + default kind have been unified to one message reported by
   resolve_tag or check_*_constraints.

gcc/fortran/ChangeLog:

2020-04-09  Fritz Reese  <foreese@gcc.gnu.org>

	PR fortran/87923
	* gfortran.h (gfc_resolve_open, gfc_resolve_close): Add
	locus parameter.
	(gfc_resolve_dt): Add code parameter.
	* io.c (async_io_dt, check_char_variable, is_char_type): Removed.
	(resolve_tag_format): Add locus to error message regarding
	zero-sized array in FORMAT tag.
	(check_open_constraints, check_close_constraints): New functions
	called at resolution time.
	(gfc_match_open, gfc_match_close, match_io): Move checks which don't
	affect the match result to new functions check_open_constraints,
	check_close_constraints, check_io_constraints.
	(gfc_resolve_open, gfc_resolve_close): Call new functions
	check_open_constraints, check_close_constraints after all tags have
	been independently resolved.  Remove duplicate constraints which are
	already verified by resolve_tag. Explicitly pass locus to all error
	reports.
	(compare_to_allowed_values): Add locus parameter and provide
	explicit locus all error reports.
	(match_open_element, match_close_element, match_file_element,
	match_dt_element, match_inquire_element): Remove redundant special
	cases for ASYNCHRONOUS and IOMSG tags.
	(gfc_resolve_dt): Remove redundant special case for format
	expression.  Call check_io_constraints, forwarding an I/O list as
	the io_code parameter if present.
	(check_io_constraints): Change return type to bool. Pass explicit
	locus to error reports. Move generic checks after tag-specific
	checks, since errors are no longer buffered.  Move simplification of
	format string to match_io.  Remove redundant checks which are
	verified by resolve_tag.  Remove usage of async_io_dt flag and
	explicitly mark symbols used in asynchronous I/O with the
	asynchronous attribute.
	* resolve.c (resolve_transfer, resolve_fl_namelist): Remove checks
	for async_io_dt flag. This is now done in io.c
	(check_io_constraints).
	(gfc_resolve_code): Pass code locus to gfc_resolve_open,
	gfc_resolve_close, gfc_resolve_dt.

gcc/testsuite/ChangeLog:

2020-04-09  Fritz Reese  <foreese@gcc.gnu.org>

	PR fortran/87923
	* gfortran.dg/f2003_io_8.f03: Fix expected error messages.
	* gfortran.dg/io_constraints_8.f90: Likewise.
	* gfortran.dg/iomsg_2.f90: Likewise.
	* gfortran.dg/pr66725.f90: Likewise.
	* gfortran.dg/pr88205.f90: Likewise.
	* gfortran.dg/write_check4.f90: Likewise.
	* gfortran.dg/asynchronous_5.f03: New test.
	* gfortran.dg/io_constraints_15.f90: Likewise.
	* gfortran.dg/io_constraints_16.f90: Likewise.
	* gfortran.dg/io_constraints_17.f90: Likewise.
	* gfortran.dg/io_constraints_18.f90: Likewise.
	* gfortran.dg/io_tags_1.f90: Likewise.
	* gfortran.dg/io_tags_10.f90: Likewise.
	* gfortran.dg/io_tags_2.f90: Likewise.
	* gfortran.dg/io_tags_3.f90: Likewise.
	* gfortran.dg/io_tags_4.f90: Likewise.
	* gfortran.dg/io_tags_5.f90: Likewise.
	* gfortran.dg/io_tags_6.f90: Likewise.
	* gfortran.dg/io_tags_7.f90: Likewise.
	* gfortran.dg/io_tags_8.f90: Likewise.
	* gfortran.dg/io_tags_9.f90: Likewise.
	* gfortran.dg/write_check5.f90: Likewise.

Here due to my recent change to store_init_value we were expanding the
initializer of aw knowing that we were initializing aw.  When
cxx_eval_call_expression finished the constructor, it wanted to look up the
value of aw to set TREE_READONLY on it, but we haven't set DECL_INITIAL yet,
so decl_constant_value tried to instantiate the initializer again.  And
infinite recursion.  Stopped by optimizing the case of asking for the value
of ctx->object, which is ctx->value.  It also would have worked to look in
the values hash table, so let's move that up before decl_constant_value as
well.

gcc/cp/ChangeLog
2020-04-09  Jason Merrill  <jason@redhat.com>

	PR c++/94523
	* constexpr.c (cxx_eval_constant_expression) [VAR_DECL]: Look at
	ctx->object and ctx->global->values first.

LWG 3324 changed the [cmp.alg] types to use std::compare_three_way
instead of the <=> operator, but we were still using the old
specification. In order to make the existing tests pass the N::X type
needs to be equality comparable, so that three_way_comparable is
satisfied and compare_three_way can be used.

As part of this change I noticed that the compare_three_way call
operator was unconditionally noexcept, which is incorrect.

	* libsupc++/compare (compare_three_way): Fix noexcept-specifier.
	(strong_order, weak_order, partial_order): Replace uses of <=> with
	compare_three_way function object (LWG 3324).
	* testsuite/18_support/comparisons/algorithms/partial_order.cc: Add
	equality operator so that X satisfies three_way_comparable.
	* testsuite/18_support/comparisons/algorithms/strong_order.cc:
	Likewise.
	* testsuite/18_support/comparisons/algorithms/weak_order.cc: Likewise.

Some more C++20 changes from P1614R2, "The Mothership has Landed".

This includes the proposed resolution for LWG 3426 to fix the three-way
comparison with nullptr_t.

The existing tests for unique_ptr comparisons don't actually check the
results, only that the expressions compile and are convertible to bool.
This also adds a test for the results of those comparisons for C++11 and
up.

	* include/bits/unique_ptr.h (operator<=>): Define for C++20.
	* 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/comparison/compare.cc: New test.
	* testsuite/20_util/unique_ptr/comparison/compare_c++20.cc: New test.

This fixes an ICE in rtl_verify_fallthru, at cfgrtl.c:2970
gcc.c-torture/execute/20071210-1.c for -mcpu=msp430 at -O2
and above.

The epilogue_helper insn was treated as a regular insn which will
fallthru, so when a barrier is emitted after it, RTL verification failed
as rtl_verify_fallthru.

gcc/ChangeLog:

2020-04-09  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	* config/msp430/msp430.c (msp430_expand_epilogue): Use emit_jump_insn
	when to emit the epilogue_helper insn.
	* config/msp430/msp430.md (epilogue_helper): Add a return insn to the
	RTL pattern.

On the https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94495#c5
testcase GCC emits worse debug info after the PR92264 cselib.c
changes.
The difference at -O2 -g -dA in the assembly is (when ignoring debug info):
        # DEBUG g => [argp]
        # DEBUG k => [argp+0x20]
        # DEBUG j => [argp+0x18]
        # DEBUG a => di
        # DEBUG b => si
        # DEBUG c => dx
        # DEBUG d => cx
        # DEBUG h => [argp+0x8]
        # DEBUG e => r8
        # DEBUG i => [argp+0x10]
        # DEBUG f => r9
...
 .LVL4:
+       # DEBUG h => [sp+0x10]
+       # DEBUG i => [sp+0x18]
+       # DEBUG j => [sp+0x20]
+       # DEBUG k => [sp+0x28]
        # DEBUG c => entry_value
 # SUCC: EXIT [always]  count:1073741824 (estimated locally)
        ret
 .LVL5:
+       # DEBUG k => [argp+0x20]
        # DEBUG a => bx
        # DEBUG b => si
        # DEBUG c => dx
        # DEBUG d => cx
        # DEBUG e => r8
        # DEBUG f => r9
+       # DEBUG h => [argp+0x8]
+       # DEBUG i => [argp+0x10]
+       # DEBUG j => [argp+0x18]
This means that before the changes, h, i, j, k could be all expressed
in DW_AT_location directly with DW_OP_fbreg <some_offset>, but now we need
to use a location list, where in the first part of the function and last
part of the function (everything except the ret instruction) we use that
DW_OP_fbreg <some_offset>, but for the single ret instruction we instead
say those values live in something pointed by stack pointer + offset.
It is true, but only because stack pointer + offset is equal to DW_OP_fbreg
<some_offset> at that point.

The var-tracking pass has for !frame_pointer_needed functions code to
canonicalize stack pointer uses in the insns before it hands it over
to cselib to cfa_base_rtx + offset depending on the stack depth at each
point.  The problem is that on the last epilogue pop insn (the one right
before ret) the canonicalization is sp = argp - 8 and add_stores records
a MO_VAL_SET operation for that argp - 8 value (which is the
SP_DERIVED_VALUE_P VALUE the cselib changes canonicalize sp based accesses
on) and thus var-tracking from that point onwards tracks that that VALUE
(2:2) now lives in sp.  At the end of function it of course needs to forget
it again (or it would need on any changes to sp).  But when processing
that uop, we note that the VALUE has changed and anything based on it
changed too, so emit changes for everything.  Before that var-tracking
itself doesn't track it in any register, so uses cselib and cselib knows
through the permanent equivs how to compute it using argp (i.e. what
will be DW_OP_fbreg).

The following fix has two parts.  One is it detects if cselib can compute
a certain VALUE using the cfa_base_rtx and for such VALUEs doesn't add
the MO_VAL_SET operation, as it is better to express them using cfa_base_rtx
rather than temporarily through something else.  And the other is make sure
we reuse in !frame_pointer_needed the single SP_DERIVED_VALUE_P VALUE in
other extended basic blocks too (and other VALUEs) too.  This can be done
because we have computed the stack depths at the start of each basic block
in vt_stack_adjustments and while cselib_reset_table is called at the end
of each extended bb, which throws away all hard registers (but the magic
cfa_base_rtx) and so can hint cselib.c at the start of the ebb what VALUE
the sp hard reg has.  That means fewer VALUEs during var-tracking and more
importantly that they will all have the cfa_base_rtx + offset equivalency.

I have performed 4 bootstraps+regtests (x86_64-linux and i686-linux,
each with this patch (that is the new cselib + var-tracking variant) and
once with that patch reverted as well as all other cselib.c changes from
this month; once that bootstrapped, I've reapplied the cselib.c changes and
this patch and rebuilt cc1plus, so that the content is comparable, but built
with the pre-Apr 2 cselib.c+var-tracking.c (that is the old cselib one)).

Below are readelf -WS cc1plus | grep debug_ filtered to only have debug
sections whose size actually changed, followed by dwlocstat results on
cc1plus.  This shows that there was about 3% shrink in those .debug*
sections for 32-bit and 1% shrink for 64-bit, with minor variable coverage
changes one or the other way that are IMHO insignificant.

32-bit old cselib
  [33] .debug_info       PROGBITS        00000000 29139c0 710e5fa 00      0   0  1
  [34] .debug_abbrev     PROGBITS        00000000 9a21fba 21ad6d 00      0   0  1
  [35] .debug_line       PROGBITS        00000000 9c3cd27 1a05e56 00      0   0  1
  [36] .debug_str        PROGBITS        00000000 b642b7d 7cad09 01  MS  0   0  1
  [37] .debug_loc        PROGBITS        00000000 be0d886 5792627 00      0   0  1
  [38] .debug_ranges     PROGBITS        00000000 1159fead e57218 00      0   0  1
sum 263075589B
32-bit new cselib + var-tracking
  [33] .debug_info       PROGBITS        00000000 29129c0 71065d1 00      0   0  1
  [34] .debug_abbrev     PROGBITS        00000000 9a18f91 21af28 00      0   0  1
  [35] .debug_line       PROGBITS        00000000 9c33eb9 195dffc 00      0   0  1
  [36] .debug_str        PROGBITS        00000000 b591eb5 7cace0 01  MS  0   0  1
  [37] .debug_loc        PROGBITS        00000000 bd5cb95 50185bf 00      0   0  1
  [38] .debug_ranges     PROGBITS        00000000 10d75154 e57068 00      0   0  1
sum 254515196B (8560393B smaller)
64-bit old cselib
  [33] .debug_info       PROGBITS        0000000000000000 25e64b0 84d7cc9 00      0   0  1
  [34] .debug_abbrev     PROGBITS        0000000000000000 aabe179 225e2d 00      0   0  1
  [35] .debug_line       PROGBITS        0000000000000000 ace3fa6 19a3505 00      0   0  1
  [37] .debug_loc        PROGBITS        0000000000000000 ce6e960 89707bc 00      0   0  1
  [38] .debug_ranges     PROGBITS        0000000000000000 157df11c 1c59a70 00      0   0  1
sum 342274599B
64-bit new cselib + var-tracking
  [33] .debug_info       PROGBITS        0000000000000000 25e64b0 84d8e86 00      0   0  1
  [34] .debug_abbrev     PROGBITS        0000000000000000 aabf336 225e8d 00      0   0  1
  [35] .debug_line       PROGBITS        0000000000000000 ace51c3 199ded5 00      0   0  1
  [37] .debug_loc        PROGBITS        0000000000000000 ce6a54d 85f62da 00      0   0  1
  [38] .debug_ranges     PROGBITS        0000000000000000 15460827 1c59a20 00      0   0  1
sum 338610402B (3664197B smaller)
32-bit old cselib
cov%	samples	cumul
0..10	1231599/48%	1231599/48%
11..20	31017/1%	1262616/49%
21..30	36495/1%	1299111/51%
31..40	35846/1%	1334957/52%
41..50	47179/1%	1382136/54%
51..60	41203/1%	1423339/56%
61..70	65504/2%	1488843/58%
71..80	59656/2%	1548499/61%
81..90	104399/4%	1652898/65%
91..100	882231/34%	2535129/100%
32-bit new cselib + var-tracking
cov%	samples	cumul
0..10	1230542/48%	1230542/48%
11..20	30385/1%	1260927/49%
21..30	36393/1%	1297320/51%
31..40	36053/1%	1333373/52%
41..50	47670/1%	1381043/54%
51..60	41599/1%	1422642/56%
61..70	65902/2%	1488544/58%
71..80	59911/2%	1548455/61%
81..90	104607/4%	1653062/65%
91..100	882067/34%	2535129/100%
64-bit old cselib
cov%	samples	cumul
0..10	1233211/48%	1233211/48%
11..20	31120/1%	1264331/49%
21..30	39230/1%	1303561/51%
31..40	38887/1%	1342448/52%
41..50	47519/1%	1389967/54%
51..60	45264/1%	1435231/56%
61..70	69431/2%	1504662/59%
71..80	62114/2%	1566776/61%
81..90	104587/4%	1671363/65%
91..100	876085/34%	2547448/100%
64-bit new cselib + var-tracking
cov%	samples	cumul
0..10	1233471/48%	1233471/48%
11..20	31093/1%	1264564/49%
21..30	39217/1%	1303781/51%
31..40	38851/1%	1342632/52%
41..50	47488/1%	1390120/54%
51..60	45224/1%	1435344/56%
61..70	69409/2%	1504753/59%
71..80	62140/2%	1566893/61%
81..90	104616/4%	1671509/65%
91..100	875939/34%	2547448/100%

2020-04-09  Jakub Jelinek  <jakub@redhat.com>

	PR debug/94495
	* cselib.h (cselib_record_sp_cfa_base_equiv,
	cselib_sp_derived_value_p): Declare.
	* cselib.c (cselib_record_sp_cfa_base_equiv,
	cselib_sp_derived_value_p): New functions.
	* var-tracking.c (add_stores): Don't record MO_VAL_SET for
	cselib_sp_derived_value_p values.
	(vt_initialize): Call cselib_record_sp_cfa_base_equiv at the
	start of extended basic blocks other than the first one
	for !frame_pointer_needed functions.

This patch implements the "arm_sve_vector_bits" attribute, which can be
used to create fixed-length versions of an SVE type while maintaining
their "SVEness".  For example, when __ARM_FEATURE_SVE_BITS==256:

typedef svint32_t vec __attribute__((arm_sve_vector_bits(256)));

creates a 256-bit version of svint32_t.

The attribute itself is quite simple.  However, it means that we now
need to implement the full PCS rules for scalable types, whereas
previously we only needed to handle scalable types that were built
directly into the compiler.  See:

  https://github.com/ARM-software/abi-aa/blob/master/aapcs64/aapcs64.rst

for more information about these rules.

2020-04-09  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* doc/sourcebuild.texi (aarch64_sve_hw, aarch64_sve128_hw)
	(aarch64_sve256_hw, aarch64_sve512_hw, aarch64_sve1024_hw)
	(aarch64_sve2048_hw): Document.
	* config/aarch64/aarch64-protos.h
	(aarch64_sve::handle_arm_sve_vector_bits_attribute): Declare.
	* config/aarch64/aarch64-c.c (aarch64_update_cpp_builtins): Define
	__ARM_FEATURE_SVE_VECTOR_OPERATIONS when SVE is enabled.
	* config/aarch64/aarch64-sve-builtins.cc (matches_type_p): New
	function.
	(find_type_suffix_for_scalar_type): Use it instead of comparing
	TYPE_MAIN_VARIANTs.
	(function_resolver::infer_vector_or_tuple_type): Likewise.
	(function_resolver::require_vector_type): Likewise.
	(handle_arm_sve_vector_bits_attribute): New function.
	* config/aarch64/aarch64.c (pure_scalable_type_info): New class.
	(aarch64_attribute_table): Add arm_sve_vector_bits.
	(aarch64_return_in_memory_1):
	(pure_scalable_type_info::piece::get_rtx): New function.
	(pure_scalable_type_info::num_zr): Likewise.
	(pure_scalable_type_info::num_pr): Likewise.
	(pure_scalable_type_info::get_rtx): Likewise.
	(pure_scalable_type_info::analyze): Likewise.
	(pure_scalable_type_info::analyze_registers): Likewise.
	(pure_scalable_type_info::analyze_array): Likewise.
	(pure_scalable_type_info::analyze_record): Likewise.
	(pure_scalable_type_info::add_piece): Likewise.
	(aarch64_some_values_include_pst_objects_p): Likewise.
	(aarch64_returns_value_in_sve_regs_p): Use pure_scalable_type_info
	to analyze whether the type is returned in SVE registers.
	(aarch64_takes_arguments_in_sve_regs_p): Likwise whether the type
	is passed in SVE registers.
	(aarch64_pass_by_reference_1): New function, extracted from...
	(aarch64_pass_by_reference): ...here.  Use pure_scalable_type_info
	to analyze whether the type is a pure scalable type and, if so,
	whether it should be passed by reference.
	(aarch64_return_in_msb): Return false for pure scalable types.
	(aarch64_function_value_1): Fold back into...
	(aarch64_function_value): ...this function.  Use
	pure_scalable_type_info to analyze whether the type is a pure
	scalable type and, if so, which registers it should use.  Handle
	types that include pure scalable types but are not themselves
	pure scalable types.
	(aarch64_return_in_memory_1): New function, split out from...
	(aarch64_return_in_memory): ...here.  Use pure_scalable_type_info
	to analyze whether the type is a pure scalable type and, if so,
	whether it should be returned by reference.
	(aarch64_layout_arg): Remove orig_mode argument.  Use
	pure_scalable_type_info to analyze whether the type is a pure
	scalable type and, if so, which registers it should use.  Handle
	types that include pure scalable types but are not themselves
	pure scalable types.
	(aarch64_function_arg): Update call accordingly.
	(aarch64_function_arg_advance): Likewise.
	(aarch64_pad_reg_upward): On big-endian targets, return false for
	pure scalable types that are smaller than 16 bytes.
	(aarch64_member_type_forces_blk): New function.
	(aapcs_vfp_sub_candidate): Exit early for built-in SVE types.
	(aarch64_short_vector_p): Return false for VECTOR_TYPEs that
	correspond to built-in SVE types.  Do not rely on a vector mode
	if the type includes an pure scalable type.  When returning true,
	assert that the mode is not an SVE mode.
	(aarch64_vfp_is_call_or_return_candidate): Do not check for SVE
	built-in types here.  When returning true, assert that the type
	does not have an SVE mode.
	(aarch64_can_change_mode_class): Don't allow anything to change
	between a predicate mode and a non-predicate mode.  Also don't
	allow changes between SVE vector modes and other modes that
	might be bigger than 128 bits.
	(aarch64_invalid_binary_op): Reject binary operations that mix
	SVE and GNU vector types.
	(TARGET_MEMBER_TYPE_FORCES_BLK): Define.

gcc/testsuite/
	* gcc.target/aarch64/sve/acle/general/attributes_1.c: New test.
	* gcc.target/aarch64/sve/acle/general/attributes_2.c: Likewise.
	* gcc.target/aarch64/sve/acle/general/attributes_3.c: Likewise.
	* gcc.target/aarch64/sve/acle/general/attributes_4.c: Likewise.
	* gcc.target/aarch64/sve/acle/general/attributes_5.c: Likewise.
	* gcc.target/aarch64/sve/acle/general/attributes_6.c: Likewise.
	* gcc.target/aarch64/sve/acle/general/attributes_7.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct.h: New file.
	* gcc.target/aarch64/sve/pcs/struct_1_128.c: New test.
	* gcc.target/aarch64/sve/pcs/struct_1_256.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_1_512.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_1_1024.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_1_2048.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_2_128.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_2_256.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_2_512.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_2_1024.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_2_2048.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_3_128.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_3_256.c: Likewise.
	* gcc.target/aarch64/sve/pcs/struct_3_512.c: Likewise.
	* lib/target-supports.exp (check_effective_target_aarch64_sve128_hw)
	(check_effective_target_aarch64_sve512_hw)
	(check_effective_target_aarch64_sve1024_hw)
	(check_effective_target_aarch64_sve2048_hw): New procedures.

It's more convenient for a later patch if sizelessness is represented
separately from "SVEness".  "SVEness" is an ABI property that carries
forward into gimple and beyond, and continues to matter during LTO.
Sizelessness is just a frontend restriction and can be ignored after
that.

2020-04-09  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* config/aarch64/aarch64.c (aarch64_attribute_table): Add
	"SVE sizeless type".
	* config/aarch64/aarch64-sve-builtins.cc (make_type_sizeless)
	(sizeless_type_p): New functions.
	(register_builtin_types): Apply make_type_sizeless to the type.
	(register_tuple_type): Likewise.
	(verify_type_context): Use sizeless_type_p instead of builin_type_p.

arm_cde.h includes the arm_mve_types.h header, which declares some C++
overloaded functions.

There is a superfluous `extern "C"` statement in arm_cde.h, which
encompasses these functions.  This means that if compiling for C++, the
overloaded functions are declared, but are declared without name
mangling.  Hence all the function names are the same and we have many
conflicting declarations.

Testing Done:
  Regression tested for arm-none-eabi.

gcc/ChangeLog:

2020-04-09  Matthew Malcomson  <matthew.malcomson@arm.com>

	* config/arm/arm_cde.h: Remove `extern "C"` when compiling for
	C++.

gcc/testsuite/ChangeLog:

2020-04-09  Matthew Malcomson  <matthew.malcomson@arm.com>

	* g++.target/arm/cde_mve.C: New test.

This is yet another old option that would have been somewhat useful back
before the D front-end implementation was able to support compiling
without the Druntime library.

Now however, -fno-druntime makes the gcstub package redundant, so the
option has been removed, along with the package itself.

libphobos/ChangeLog:

	* configure: Regenerate.
	* libdruntime/Makefile.am (ALL_DRUNTIME_INSTALL_DSOURCES): Remove
	DRUNTIME_DSOURCES_GC and DRUNTIME_DSOURCES_GCSTUB.
	(DRUNTIME_DSOURCES): Add gc/*.d sources.
	(DRUNTIME_DSOURCES_GC): Remove.
	(DRUNTIME_DSOURCES_GCSTUB): Remove.
	* libdruntime/Makefile.in: Regenerate.
	* libdruntime/gcstub/gc.d: Remove.
	* m4/druntime.m4 (DRUNTIME_GC): Remove.

The cmse-15.c testcase fails at -Os because ICF means that we
generate
nonsecure2:
        b       nonsecure0

which is OK, but does not match the currently expected
nonsecure2:
...
        bl      __gnu_cmse_nonsecure_call

(see https://gcc.gnu.org/pipermail/gcc-patches/2020-April/543190.html)

The test has already different expectations for v8-M and v8.1-M.

This patch uses check-function-bodies to account for the
different possibilities:
- v8-M vs v8.1-M via different target selectors where needed
- code generation variants (-0?) via multiple regexps

I've tested that the test now passes with --target-board=-march=armv8-m.main
and --target-board=-march=armv8.1-m.main.

{target { ! a } } does not work because the greedy regexp extracts
"! a }" instead of "target { ! a }".

This patch replaces it with a non-greedy regexp.

2020-04-09  Christophe Lyon  <christophe.lyon@linaro.org>

	* lib/scanasm.exp (check-function-bodies): Use non-greedy regexp
	when extracting the target selector.

We recently rearranged the gdb source tree to move a common library
and gdbserver to the top-level.  This made the build more uniform and
also a bit faster (due to sharing of built objects).

This patch re-syncs these changes the top-level configury back to gcc.

ChangeLog:
	* configure: Rebuild.
	* Makefile.in: Rebuild.
	* Makefile.def (gdbsupport, gdbserver): New host modules.
	(configure-gdb): Depend on all-gdbsupport.
	(all-gdb): Depend on all-gdbsupport, all-libctf.
	* configure.ac (host_tools): Add gdbserver.
	Conditionally build gdbserver and gdbsupport.

when sra_modify_expr is invoked on an expression that modifies only
part of the underlying replacement, such as a BIT_FIELD_REF on a LHS
of an assignment and the SRA replacement's type is not compatible with
what is being replaced (0th operand of the B_F_R in the above
example), it does not work properly, basically throwing away the partd
of the expr that should have stayed intact.

This is fixed in two ways.  For BIT_FIELD_REFs, which operate on the
binary image of the replacement (and so in a way serve as a
VIEW_CONVERT_EXPR) we just do not bother with convertsing.  For
REALPART_EXPRs and IMAGPART_EXPRs, if the replacement is not a
register, we insert a VIEW_CONVERT_EXPR under
the complex partial access expression, which is always OK, for loads
from registers we take the extra step of converting it to a temporary.

This revealed a bug in fwprop which is fixed with the hunk from Richi.

The testcase for handling REALPART_EXPR and IMAGPART_EXPR is a bit
fragile because SRA prefers complex and vector types over anything
else (and in between the two it decides based on TYPE_UID which in my
testing today always preferred complex types) and so I only run it at
-O1 (which is the only level where the the test fails for me).

Bootstrapped and tested on x86_64-linux, i686-linux and aarch64-linux.

2020-04-09  Martin Jambor  <mjambor@suse.cz>
	    Richard Biener  <rguenther@suse.de>

	PR tree-optimization/94482
	* tree-sra.c (create_access_replacement): Dump new replacement with
	TDF_UID.
	(sra_modify_expr): Fix handling of cases when the original EXPR writes
	to only part of the replacement.
	* tree-ssa-forwprop.c (pass_forwprop::execute): Properly verify
	the first operand of combinations into REAL/IMAGPART_EXPR and
	BIT_FIELD_REF.

	testsuite/
	* gcc.dg/torture/pr94482.c: New test.
	* gcc.dg/tree-ssa/pr94482-2.c: Likewise.

This PR points out that we are rejecting valid code in C++20.  The
problem is that we were surreptitiously transforming

  T& t(e)

into

  T& t{e}

which is wrong, because the type of e had a conversion function to T,
while aggregate initialization of t from e doesn't work.  Therefore, I
was violating a design principle of P0960, which says that any existing
meaning of A(b) should not change.  So I think we should only attempt to
aggregate-initialize if the original expression was ill-formed.

Another design principle is that () should work where {} works, so this:

  struct S { int i; };
  const S& s(1);

has to keep working.  Thus the special handling for paren-lists with one
element.  (A paren-list with more than one element would give you "error:
expression list treated as compound expression in initializer" C++17.)

	PR c++/93790
	* call.c (initialize_reference): If the reference binding failed, maybe
	try initializing from { }.
	* decl.c (grok_reference_init): For T& t(e), set
	LOOKUP_AGGREGATE_PAREN_INIT but don't build up a constructor yet.

	* g++.dg/cpp2a/paren-init23.C: New test.
	* g++.dg/init/aggr14.C: New test.

	PR tree-optimization/91322
	* g++.dg/lto/alias-4_0.C: Avoid conflict with va_list on ARM and add
	a template testing that.

In g:2171a920 I'd tried to fix
various ILP32 testsuite failures by restricting some tests to LP64.
Unfortunately, I messed up the check-function-bodies syntax and passed
the target selector as the "option" parameter, which had the effect of
disabling the tests for both ILP32 and LP64.

The fix ought to have been to add "" as the option parameter.  However,
check-function-bodies wasn't treating "" in the same way as an omitted
argument.  The easiest fix seemed to be turn the argument into a list of
options, which also makes the interface a bit more general.

Having done that, it seemed a good idea to check for things that look
like target/xfail selectors, so that the mistake isn't silent next time.

2020-04-09  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* doc/sourcebuild.texi (check-function-bodies): Treat the third
	parameter as a list of option regexps and require each regexp
	to match.

gcc/testsuite/
	* lib/scanasm.exp (check-function-bodies): Treat the third
	parameter as a list of option regexps and require each regexp
	to match.  Check for cases in which a target/xfail selector
	was mistakenly passed to the options argument.
	* gcc.target/aarch64/sve/pcs/args_1.c: Add an empty options list
	to the invocation of check-function-bodies.
	* gcc.target/aarch64/sve/pcs/args_2.c: Likewise.
	* gcc.target/aarch64/sve/pcs/args_3.c: Likewise.
	* gcc.target/aarch64/sve/pcs/args_4.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_1.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_1_1024.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_1_128.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_1_2048.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_1_256.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_1_512.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_2.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_3.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_4.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_4_1024.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_4_128.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_4_2048.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_4_256.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_4_512.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_5.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_5_1024.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_5_128.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_5_2048.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_5_256.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_5_512.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_6.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_6_1024.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_6_128.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_6_2048.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_6_256.c: Likewise.
	* gcc.target/aarch64/sve/pcs/return_6_512.c: Likewise.
	* gcc.target/aarch64/sve/pcs/saves_2_be_nowrap.c: Likewise.
	* gcc.target/aarch64/sve/pcs/saves_2_be_wrap.c: Likewise.
	* gcc.target/aarch64/sve/pcs/saves_2_le_nowrap.c: Likewise.
	* gcc.target/aarch64/sve/pcs/saves_2_le_wrap.c: Likewise.
	* gcc.target/aarch64/sve/pcs/saves_3.c: Likewise.
	* gcc.target/aarch64/sve/pcs/saves_4_be.c: Likewise.
	* gcc.target/aarch64/sve/pcs/saves_4_le.c: Likewise.
	* gcc.target/aarch64/sve/pcs/stack_clash_2_128.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_1.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_f16.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_f32.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_f64.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_s16.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_s32.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_s64.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_s8.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_u16.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_u32.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_u64.c: Likewise.
	* gcc.target/aarch64/sve/pcs/varargs_2_u8.c: Likewise.

The testcase contains an ODR violation and thus the observed
link failure is an accepted outcome (it originally was for
an ICE during WPA).  Thus the following adds -shared to the link.

2020-04-09  Richard Biener  <rguenther@suse.de>

	PR testsuite/93369
	* g++.dg/lto/pr64076_0.C: Add -shared -fPIC.
	* g++.dg/lto/pr64076_1.C: Add -fPIC.

gcc/ChangeLog

2020-04-09  Andrea Corallo  <andrea.corallo@arm.com>

	PR target/94530
	* config/aarch64/falkor-tag-collision-avoidance.c
	(valid_src_p): Fix missing rtx type check.

gcc/testsuite/ChangeLog

2020-04-09  Andrea Corallo  <andrea.corallo@arm.com>

	* gcc.target/aarch64/pr94530.c: New test.

Precisely,  for iv_use if it's not integer/pointer type, or non-mode
precision type, add candidate for the corresponding scev in unsigned
type with the same precision, rather than its original type.

gcc/
    PR tree-optimization/93674
    * tree-ssa-loop-ivopts.c (langhooks.h): New include.
    (add_iv_candidate_for_use): For iv_use of non integer or pointer type,
    or non-mode precision type, add candidate in unsigned type with the
    same precision.

gcc/testsuite/
    PR tree-optimization/93674
    * g++.dg/pr93674.C: New test.

When we promote captured temporaries to local variables, we also
remove their initializers from the relevant call expression.  This
means that we should recompute the need for a cleanup expression
once the set of temporaries that remains becomes known.

gcc/cp/ChangeLog:

2020-04-08  Iain Sandoe  <iain@sandoe.co.uk>
	    Jun Ma  <JunMa@linux.alibaba.com>

	* coroutines.cc (maybe_promote_captured_temps): Add a
	cleanup expression, if needed, to any call from which
	we promoted temporaries captured by reference.

2020-04-08  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/testsuite/
	* g++.dg/tree-ssa/pr93940.C: Require pthread target.

This is another vect case which requires special handling with
vect_hw_misalign.  The alignment of the second part requires
misaligned vector access supports.  This patch is to adjust
the related guard condition and comments.

Verified it on ppc64-redhat-linux (Power7 BE).

2020-04-09  Kewen Lin  <linkw@gcc.gnu.org>

gcc/testsuite/ChangeLog

    PR testsuite/94023
    * gfortran.dg/vect/pr83232.f90: Expect 2 rather than 3 times SLP on
    non-vect_hw_misalign targets.