Implement -fprofile-prefix-map.

PR gcov-profile/96092

gcc/ChangeLog:

* common.opt: New option.
* coverage.c (coverage_begin_function): Emit filename with
remap_profile_filename.
* doc/invoke.texi: Document the new option.
* file-prefix-map.c (add_profile_prefix_map): New.
(remap_profile_filename): Likewise.
* file-prefix-map.h (add_profile_prefix_map): Likewise.
(remap_profile_filename): Likewise.
* lto-opts.c (lto_write_options): Handle
OPT_fprofile_prefix_map_.
* opts-global.c (handle_common_deferred_options): Likewise.
* opts.c (common_handle_option): Likewise.
(gen_command_line_string): Likewise.
* profile.c (output_location): Emit filename with
remap_profile_filename.

c++: ICE with unnamed tparm and concept [PR103408]

Here we crash when issuing the "constraint C has type T, not bool"
error, because pp_cxx_parameter_mapping wasn't prepared to see an
anonymous template parameter.  With this patch we print

error: constraint 'auto(<lambda>) [with <unnamed> = 0]' has type '<lambda()>', not 'bool'

The "<unnamed>" is what this patch adds.

PR c++/103408

gcc/cp/ChangeLog:

* cxx-pretty-print.c (pp_cxx_parameter_mapping): Print "<unnamed>"
rather than crash on an unnamed template parameter.

gcc/testsuite/ChangeLog:

* g++.dg/cpp23/concepts-err1.C: New test.

middle-end/103271 - avoid VLA init of register

This avoids using VLA types to initalize a register with
-ftrivial-auto-var-init in some cases.

2021-12-02  Richard Biener  <rguenther@suse.de>

PR middle-end/103271
* internal-fn.c (expand_DEFERRED_INIT): When the base
of the LHS is a decl with matching constant size use
that as the initialization target instead of an
eventual VLA typed one.

tree-optimization/103527 - always use thruth type forgather mask

This makes sure to always use a truth type to build the gather
mask argument even when the target builtin prototype in the end
wants a float vector.

2021-12-02  Richard Biener  <rguenther@suse.de>

PR tree-optimization/103527
* tree-vect-stmts.c (vect_build_gather_load_calls): Always
use a truth type for building the vector mask.

fix spelling of -linker-output-auto-nolto-rel

The transposition nolto -> notlo is confusing and it makes the long
name even harder to read than it already is - I kept reading it as
"not lo" until I realized it was a simple typo.

Fixes: 5269b24605b1 (Silence warning in LTO mode on VxWorks)
lto-plugin/
* lto-plugin.c: Fix -linker-output-auto-notlo-rel ->
-linker-output-auto-nolto-rel typo.
(process_option): Adjust accordingly, accepting both old and
new spelling.

gcc/
* config/vxworks.h (LTO_PLUGIN_SPEC): Adapt to corrected
spelling of -linker-output-auto-nolto-rel.

fortran: OpenMP/OpenACC array mapping alignment fix (PR90030)

Fix issue with the Fortran front-end when mapping arrays: when creating the
data MEM_REF for the map clause, there was a convention of casting the
referencing pointer to 'c_char *' by
fold_convert (build_pointer_type (char_type_node), ptr).

This causes the alignment passed to the libgomp runtime for array data
hardwared to '1', and causes alignment errors on the offload target.

This patch fixes this by removing the char_type_node pointer converts, and
adding gcc_asserts to ensure POINTER_TYPE_P (TREE_TYPE (ptr)).

PR fortran/90030

gcc/fortran/ChangeLog:

* trans-openmp.c (gfc_omp_finish_clause): Remove fold_convert to pointer
to char_type_node, add gcc_assert of POINTER_TYPE_P.
(gfc_trans_omp_array_section): Likewise.
(gfc_trans_omp_clauses): Likewise.

gcc/testsuite/ChangeLog:

* gfortran.dg/goacc/finalize-1.f: Adjust scan test.
* gfortran.dg/gomp/affinity-clause-1.f90: Likewise.
* gfortran.dg/gomp/affinity-clause-5.f90: Likewise.
* gfortran.dg/gomp/defaultmap-4.f90: Likewise.
* gfortran.dg/gomp/defaultmap-5.f90: Likewise.
* gfortran.dg/gomp/defaultmap-6.f90: Likewise.
* gfortran.dg/gomp/map-3.f90: Likewise.
* gfortran.dg/gomp/pr78260-2.f90: Likewise.
* gfortran.dg/gomp/pr78260-3.f90: Likewise.

libgomp/ChangeLog:

* testsuite/libgomp.oacc-fortran/pr90030.f90: New test.
* testsuite/libgomp.fortran/pr90030.f90: New test.

libphobos: Add missing ControlState variable for AArch64

Fixes a typo that occurred during the splitting of the std.math module
into a package.

libphobos/ChangeLog:

* src/std/math/hardware.d (FloatingPointControl.getControlState): Add
missing ControlState variable for AArch64.

d: Disable the D runtime garbage collector after initializing (PR103520)

Not all targets that support building libdruntime have a stable garbage
collector, so to avoid running into problems where live memory allocated
by the D GC is freed, disable all in-flight collections until a time
when scanning is more reliably implemented everywhere.

PR d/103520

gcc/d/ChangeLog:

* d-frontend.h (gc_disable): Declare.
* d-lang.cc (d_init_options): Disable the D runtime garbage collector
after initializing.

d: Prefix object files from the root package with 'root-'

None of the front-end module names in either the dmd or root package
collide just yet, but that does not mean they won't in the future.

gcc/d/ChangeLog:

* Make-lang.in (D_FRONTEND_OBJS): Prefix object files from the root
package with root-.
(d/root-%.o): New recipe.

Daily bump.

analyzer: fix false leak seen in Juliet 1.3 [PR102471]

Juliet 1.3's CWE415_Double_Free__malloc_free_*_67a.c
were showing leak false positives in non-LTO builds; fixed thusly.

gcc/analyzer/ChangeLog:
PR analyzer/102471
* region-model-reachability.cc (reachable_regions::handle_parm):
Treat all svalues within a compound parm has reachable, and those
wrapped in a cast.

gcc/testsuite/ChangeLog:
PR analyzer/102471
* gcc.dg/analyzer/leak-3.c: New test.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

i386: Improve V8HI and V8HF inserts [PR102811]

Introduce vec_set_0 pattern for V8HI and V8HF modes to implement scalar
element 0 inserts to from a GP register, SSE register or memory.  Also
add V8HI and V8HF AVX2 (x,x,x) alternative to PINSR insn pattern, which is
split after reload to a sequence of PBROADCASTW and PBLENDW.

The V8HF inserts from memory improve from:

-       vpbroadcastw    4(%esp), %xmm1
-       vpblendw        $16, %xmm1, %xmm0, %xmm0
+       vpinsrw $4, 4(%esp), %xmm0, %xmm0

and V8HF inserts from SSE register to element 0 improve from:

        vpxor   %xmm2, %xmm2, %xmm2
-       vpbroadcastw    %xmm0, %xmm0
        vpblendw        $1, %xmm0, %xmm2, %xmm0

Based on the above improvements, the register allocator is able to determine
the optimal instruction (or instruction sequence) based on the register set
of the input value, so there is no need to manually expand V8HI and V8HF
inserts to the sequence of VEC_DUPLICATE and VEC_MERGE RTXes.

2021-12-01  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

PR target/102811
* config/i386/sse.md (VI2F): Remove mode iterator.
(VI2F_256_512): New mode iterator.
(vec_set<V8_128:mode>_0): New insn pattern.
(vec_set<VI2F_256_512:mode>_0>): Rename from vec_set<VI2F:mode>mode.
Use VI2F_256_512 mode iterator instead of VI2F.
(*axv512fp16_movsh): Remove.
(<sse2p4_1>_pinsr<ssemodesuffix>): Add (x,x,x) AVX2 alternative.
Do not disable V8HF mode insn on AVX2 targets.
(pinsrw -> pbroadcast + pblendw peephole2): New peephole.
(pinsrw -> pbroadcast + pblendw splitter): New post-reload splitter.
* config/i386/i386.md (extendhfsf): Call gen_vec_setv8hf_0.
* config/i386/i386-expand.c (ix86_expand_vector_set)
<case E_V8HFmode>: Use vec_merge path for TARGET_AVX2.

gcc/testsuite/ChangeLog:

PR target/102881
* gcc.target/i386/pr102811-1.c: New test.
* gcc.target/i386/avx512fp16-1c.c (dg-final): Update
scan-assembler-times scan strings for ia32 targets.
* gcc.target/i386/pr102327-1.c (dg-final): Ditto.
* gcc.target/i386/pr102811.c: Rename from ...
* gcc.target/i386/avx512vl-vcvtps2ph-pr102811.c: ... this.

Final value replacement improvements for until-wrap loops.

This middle-end patch is inspired by the Richard Beiner's until-wrap
loop example in PR tree-optimization/101145.

unsigned foo(unsigned val, unsigned start)
{
  unsigned cnt = 0;
  for (unsigned i = start; i > val; ++i)
    cnt++;
  return cnt;
}

For this loop, the tree optimizers currently generate:

unsigned int foo (unsigned int val, unsigned int start)
{
  unsigned int cnt;
  unsigned int _1;
  unsigned int _5;

  <bb 2> [local count: 118111600]:
  if (start_3(D) > val_4(D))
    goto <bb 3>; [89.00%]
  else
    goto <bb 4>; [11.00%]

  <bb 3> [local count: 105119324]:
  _1 = start_3(D) + 1;
  _5 = -start_3(D);
  cnt_2 = _1 > val_4(D) ? _5 : 1;

  <bb 4> [local count: 118111600]:
  # cnt_11 = PHI <cnt_2(3), 0(2)>
  return cnt_11;
}

or perhaps slightly easier to read:

  if (start > val) {
    cnt = (start+1) > val ? -start : 1;
  } else cnt = 0;

In this snippet, if we know start > val, then (start+1) > val
unless start+1 overflows, i.e. (start+1) == 0 and start == ~0.
We can use this (loop header) context to simplify the ternary
expression to "(start != -1) ? -start : 1", which with a little
help from match.pd can be folded to -start.  Hence the optimal
final value replacement should be:

  cnt = (start > val) ? -start : 0;

Or as now generated by this patch:

unsigned int foo (unsigned int val, unsigned int start)
{
  unsigned int cnt;

  <bb 2> [local count: 118111600]:
  if (start_3(D) > val_4(D))
    goto <bb 3>; [89.00%]
  else
    goto <bb 4>; [11.00%]

  <bb 3> [local count: 105119324]:
  cnt_2 = -start_3(D);

  <bb 4> [local count: 118111600]:
  # cnt_11 = PHI <cnt_2(3), 0(2)>
  return cnt_11;
}

We can also improve until-wrap loops that don't have a (suitable) loop
header, as determined by simplify_using_initial_conditions.

unsigned bar(unsigned val, unsigned start)
{
  unsigned cnt = 0;
  unsigned i = start;
  do {
    cnt++;
    i++;
  } while (i > val);
  return cnt;
}

which is currently optimized to:

unsigned int foo (unsigned int val, unsigned int start)
{
  unsigned int cnt;
  unsigned int _9;
  unsigned int _10;

  <bb 2> [local count: 118111600]:
  _9 = start_4(D) + 1;
  _10 = -start_4(D);
  cnt_3 = val_7(D) < _9 ? _10 : 1;
  return cnt_3;
}

Here we have "val < (start+1) ? -start : 1", which again with the
help of match.pd can be slightly simplified to "val <= start ? -start : 1"
when dealing with unsigned types, because at the complicating value where
start == ~0, we fortunately have -start == 1, hence it doesn't matter
whether the second or third operand of the ternary operator is returned.

To summarize, this patch (in addition to tweaking may_be_zero in
number_of_iterations_until_wrap) adds three new constant folding
transforms to match.pd.

X != C1 ? -X : C2 simplifies to -X when -C1 == C2.
which is the generalized form of the simplification above.

X != C1 ? ~X : C2 simplifies to ~X when ~C1 == C2.
which is the BIT_NOT_EXPR analog of the NEGATE_EXPR case.

and the "until-wrap final value replacement without context":

(X + 1) > Y ? -X : 1 simplifies to X >= Y ? -X : 1 when
X is unsigned, as when X + 1 overflows, X is -1, so -X == 1.

2021-12-01  Roger Sayle  <roger@nextmovesoftware.com>
    Richard Biener  <rguenther@suse.de>

gcc/ChangeLog
* tree-ssa-loop-niter.c (number_of_iterations_until_wrap):
Check if simplify_using_initial_conditions allows us to
simplify the expression for may_be_zero.
* match.pd (X != C ? -X : -C -> -X): New transform.
(X != C ? ~X : ~C -> ~X): Likewise.
((X+1) > Y ? -X : 1 -> X >= Y ? -X : 1): Likewise.

gcc/testsuite/ChangeLog
* gcc.dg/fold-condneg-1.c: New test case.
* gcc.dg/fold-condneg-2.c: New test case.
* gcc.dg/fold-condnot-1.c: New test case.
* gcc.dg/pr101145-1.c: New test case.
* gcc.dg/pr101145-2.c: New test case.

middle-end: Skip initialization of opaque type variables [PR103127]

For -ftrivial-auto-var-init=*, skip initializing the variable if it is an
opaque type, because CONST0_RTX(mode) is not defined for opaque modes.

2021-12-01  Peter Bergner  <bergner@linux.ibm.com>

gcc/
PR middle-end/103127
* gimplify.c (is_var_need_auto_init): Handle opaque types.

gcc/testsuite/
PR middle-end/103127
* gcc.target/powerpc/pr103127.c: New test.

darwin, d: Support outfile substitution for libphobos

In the gdc driver, this takes the previous fix for the Darwin D
bootstrap, and extends it to the -static-libphobos option as well.
Rather than pushing the -static-libphobos option back onto the command
line, the setting of SKIPOPT is instead conditionally removed.  The same
change has been repeated for -static-libstdc++ so there is now no need
to call generate_option to re-add it.

In the gcc driver, -static-libphobos has been added as a common option,
validated, and a new outfile substition added to config/darwin.h to
correctly replace -lgphobos with libgphobos.a.

gcc/ChangeLog:

* common.opt (static-libphobos): Add option.
* config/darwin.h (LINK_SPEC): Substitute -lgphobos with libgphobos.a
when linking statically.
* gcc.c (driver_handle_option): Set -static-libphobos as always valid.

gcc/d/ChangeLog:

* d-spec.cc (lang_specific_driver): Set SKIPOPT on -static-libstdc++
and -static-libphobos only when target supports LD_STATIC_DYNAMIC.
Remove generate_option to re-add -static-libstdc++.

libphobos/ChangeLog:

* testsuite/testsuite_flags.in: Add libphobos library directory as
search path to --gdcldflags.

c++: constexpr, fold, weak redecl, fp/0 [PR103310]

For PR61825, honza changed tree_single_nonzero_warnv_p to prevent a later
declaration from marking a function as weak after we've determined that it
wasn't weak before.  But we shouldn't do that for speculative folding; we
should only do it when we actually need a constant value.  In C++, such a
context is called "manifestly constant-evaluated".  In fold, this seems to
correspond to the folding_initializer flag, since in C this situation only
occurs in static initializers.

This change makes nonzero-1.c well-formed; I've added a nonzero-1a.c to
verify that we delete the null check eventually if there is no weak
redeclaration.

The varasm.c change is so that if we do get the weak redeclaration error, we
get it at the position of the weak declaration rather than the previous
declaration.

Using the FOLD_INIT paths also affects floating point arithmetic: notably,
this makes floating point division by zero in a manifestly
constant-evaluated context constant, as in a C static initializer.  I've had
some success convincing CWG that this is the right direction; C++ should
follow C's floating point semantics more than we have been doing, and Joseph
says that the C policy is that Annex F overrides other parts of the standard
that say that some operations are undefined.  But since we're in stage 3,
I'm only making this change with the new flag -fconstexpr-fp-except.  It may
turn on by default in a future release.

I think this distinction is only relevant for binary operations; arithmetic
for the floating point case, comparison for possibly non-zero addresses.

PR c++/103310

gcc/ChangeLog:

* fold-const.c (maybe_nonzero_address): Use get_create or get
depending on folding_initializer.
(fold_binary_initializer_loc): New.
* fold-const.h (fold_binary_initializer_loc): Declare.
* varasm.c (mark_weak): Don't use the decl location.
* doc/invoke.texi: Document -fconstexpr-fp-except.

gcc/c-family/ChangeLog:

* c.opt: Add -fconstexpr-fp-except.

gcc/cp/ChangeLog:

* constexpr.c (cxx_eval_binary_expression): Use
fold_binary_initializer_loc if manifestly cxeval.

gcc/testsuite/ChangeLog:

* g++.dg/cpp0x/constexpr-fp-except1.C: New test.
* g++.dg/cpp1z/constexpr-if36.C: New test.
* gcc.dg/tree-ssa/nonzero-1.c: Now well-formed.
* gcc.dg/tree-ssa/nonzero-1a.c: New test.

rs6000: Mirror fix for PR102347 in new builtins support

Recently Kewen fixed a problem in the old builtins support where
rs6000_builtin_decl prematurely indicated that a target builtin is
unavailable.  This also needs to be done for the new builtins support, but in
this case we have to ensure the error message is still produced from the
overload support in rs6000-c.c.  Unfortunately, this is less straightforward
than it could be, because header file includes need to be adjusted to make this
happen.  Someday we'll consolidate all the builtin code in one file and this
won't have to be so ugly.

2021-12-01  Bill Schmidt  <wschmidt@linux.ibm.com>

gcc/
PR target/102347
* config/rs6000/rs6000-c.c (rs6000-builtins.h): Stop including.
(rs6000-internal.h): Include.
(altivec_resolve_new_overloaded_builtin): Move call to
rs6000_invalid_new_builtin here from rs6000_new_builtin_decl.
* config/rs6000/rs6000-call.c (rs6000-builtins.h): Stop including.
(rs6000_invalid_new_builtin): Remove static qualifier.
(rs6000_new_builtin_decl): Remove test for supported builtin.
* config/rs6000/rs6000-internal.h (rs6000-builtins.h): Include.
(rs6000_invalid_new_builtin): Declare.
* config/rs6000/rs6000.c (rs6000-builtins.h): Don't include.

path solver: Use only one ssa_global_cache.

We're using a temporary range cache while computing ranges for PHIs to
make sure the real cache doesn't get set until all PHIs are computed.
With the ltrans beast in LTO mode this causes undue overhead.

Since we already have a bitmap to indicate whether there's a cache
entry, we can avoid the extra cache object by clearing it while PHIs
are being calculated.

gcc/ChangeLog:

PR tree-optimization/103409
* gimple-range-path.cc (path_range_query::compute_ranges_in_phis):
Do all the work with just one ssa_global_cache.
* gimple-range-path.h: Remove m_tmp_phi_cache.

libstdc++: Clear RB tree after moving elements [PR103501]

If the allocator-extended move constructor move-constructs each element
into the new container, the contents of the old container are left in
moved-from states. We cannot know if those states preserve the
container's ordering and uniqueness guarantees, so just erase all
moved-from elements.

libstdc++-v3/ChangeLog:

PR libstdc++/103501
* include/bits/stl_tree.h (_Rb_tree(_Rb_tree&&, false_type)):
Clear container if elements have been moved-from.
* testsuite/23_containers/map/allocator/move_cons.cc: Expect
moved-from container to be empty.
* testsuite/23_containers/multimap/allocator/move_cons.cc:
Likewise.
* testsuite/23_containers/multiset/allocator/103501.cc: New test.
* testsuite/23_containers/set/allocator/103501.cc: New test.

libstdc++: Define std::__is_constant_evaluated() for internal use

This adds std::__is_constant_evaluated() as a C++11 wrapper for
__builtin_is_constant_evaluated, but just returning false if the
built-in isn't supported by the compiler. This allows us to use it
throughout the library without checking __has_builtin every time.

Some uses in std::vector and std::string can only be constexpr when the
std::is_constant_evaluated() function actually works, so we might as
well guard them with a relevant macro and call that function directly,
rather than the built-in or std::__is_constant_evaluated().

The remaining checks of the __cpp_lib_is_constant_evaluated macro could
now be replaced by checking __cplusplus >= 202002 instead, but there's
no practical difference. We still need some kind of preprocessor check
there anyway.

libstdc++-v3/ChangeLog:

* doc/doxygen/user.cfg.in (PREDEFINED): Change macro name.
* include/bits/allocator.h (allocate, deallocate): Use
std::__is_constant_evaluated() unconditionally, instead of
checking whether std::is_constant_evaluated() (or the built-in)
can be used.
* include/bits/basic_string.h: Check new macro. call
std::is_constant_evaluated() directly in C++20-only code that is
guarded by a suitable macro.
* include/bits/basic_string.tcc: Likewise.
* include/bits/c++config (__is_constant_evaluated): Define.
(_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED): Replace with ...
(_GLIBCXX_HAVE_IS_CONSTANT_EVALUATED): New macro.
* include/bits/char_traits.h (char_traits): Replace conditional
calls to std::is_constant_evaluated with unconditional calls to
std::__is_constant_evaluated.
* include/bits/cow_string.h: Use new macro.
* include/bits/ranges_algobase.h (__copy_or_move): Replace
conditional calls to std::is_constant_evaluated with unconditional
calls to std::__is_constant_evaluated.
(__copy_or_move_backward, __fill_n_fn): Likewise.
* include/bits/ranges_cmp.h (ranges::less): Likewise.
* include/bits/stl_algobase.h (lexicographical_compare_three_way):
Likewise.
* include/bits/stl_bvector.h: Call std::is_constant_evaluated
directly in C++20-only code that is guarded by a suitable macro.
* include/bits/stl_construct.h (_Construct, _Destroy, _Destroy_n):
Replace is_constant_evaluated with __is_constant_evaluated.
* include/bits/stl_function.h (greater, less, greater_equal)
(less_equal): Replace __builtin_is_constant_evaluated and
__builtin_constant_p with __is_constant_evaluated.
* include/bits/stl_vector.h: Call std::is_constant_evaluated()
in C++20-only code.
* include/debug/helper_functions.h (__check_singular): Use
__is_constant_evaluated instead of built-in, or remove check
entirely.
* include/std/array (operator<=>): Use __is_constant_evaluated
unconditionally.
* include/std/bit (__bit_ceil): Likewise.
* include/std/type_traits (is_constant_evaluated): Define using
'if consteval' if possible.
* include/std/version: Use new macro.
* libsupc++/compare: Use __is_constant_evaluated instead of
__builtin_is_constant_evaluated.
* testsuite/23_containers/array/tuple_interface/get_neg.cc:
Adjust dg-error lines.

libstdc++: Optimize ref-count updates in COW std::string

Most ref-count updates in the COW string are done via the functions in
<ext/atomicity.h>, which will use non-atomic ops when the program is
known to be single-threaded. The _M_is_leaked() and _M_is_shared()
functions use __atomic_load_n directly, because <ext/atomicity.h>
doesn't provide a load operation. Those functions can check the
__is_single_threaded() predicate to avoid using __atomic_load_n when not
needed.

The move constructor for the fully-dynamic-string increments the
ref-count by either 2 or 1, for leaked or non-leaked strings
respectively. That can be changed to use a non-atomic store of 1 for all
non-shared strings. It can be non-atomic because even if the program is
multi-threaded, conflicting access to the rvalue object while it's being
moved from would be data race anyway. It can store 1 directly for all
non-shared strings because it doesn't matter whether the initial
refcount was -1 or 0, it should be 1 after the move constructor creates
a second owner.

libstdc++-v3/ChangeLog:

* include/bits/cow_string.h (basic_string::_M_is_leaked): Use
non-atomic load when __is_single_threaded() is true.
(basic_string::_M_is_shared): Likewise.
(basic_string::(basic_string&&)) [_GLIBCXX_FULLY_DYNAMIC_STRING]:
Use non-atomic store when rvalue is not shared.

libstdc++: Avoid unwanted allocations in filesystem::path

When using COW strings, accessing _M_pathname[0] and similar non-const
accessors can cause the string to "leak", meaning it reallocates itself
if it shares ownership with another string object.

This causes test failures for --enable-fully-dynamic-string builds:
/home/jwakely/src/gcc/libstdc++-v3/testsuite/experimental/filesystem/path/construct/90634.cc:62: void test01(): Assertion 'bytes_allocated == 0' failed.
FAIL: experimental/filesystem/path/construct/90634.cc execution test

This FAIL happens because the fully-dynamic move constructor results in
shared ownership, so for path(std::move(std::string("foo"))) the
_M_pathname member shares ownership with the temporary, and the
non-const accesses in _M_split_cmpts() cause a new copy of the string to
be allocated. This un-sharing is wasteful, and entirely unnecessary when
sharing ownership with an rvalue that is about to release its ownership
anyway. Even for lvalues, sharing ownership is not a problem and
reallocating a unique copy of the string is wasteful.

This removes non-const accesses of _M_pathname in the
path::_M_split_cmpts() members.

libstdc++-v3/ChangeLog:

* src/c++17/fs_path.cc (path::_M_split_cmpts()): Remove
micro-optimization for "/" path.
* src/filesystem/path.cc (path::_M_split_cmpts()): Only access
the contents of _M_pathname using const member functions.

vect: Tighten check for SLP memory groups [PR103517]

When checking for compatible stmts, vect_build_slp_tree_1 did:

       && !(STMT_VINFO_GROUPED_ACCESS (stmt_info)
    && (first_stmt_code == ARRAY_REF
|| first_stmt_code == BIT_FIELD_REF
|| first_stmt_code == INDIRECT_REF
|| first_stmt_code == COMPONENT_REF
|| first_stmt_code == MEM_REF)))

That is, it allowed any rhs_code as long as the first_stmt_code
looked valid.  This had the effect of allowing IFN_MASK_LOAD
to be paired with an earlier non-call code (but didn't allow
the reverse).

This patch makes the check symmetrical.

gcc/
PR tree-optimization/103517
* tree-vect-slp.c (vect_build_slp_tree_1): When allowing two
different component references, check the codes of both them,
rather than just the first.

gcc/testsuite/
PR tree-optimization/103517
* gcc.dg/vect/pr103517.c: New test.

Also pre-process PHIs in range-of-stmt.

PR tree-optimization/103464
* gimple-range.cc (gimple_ranger::prefill_name): Process phis also.
(gimple_ranger::prefill_stmt_dependencies): Ditto.

testsuite: Fix typo in comment in aapcs64 test

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/aapcs64/macro-def.h (PTR): Fix typo in
comment.

doc, d: Add note that D front end now requires GDC installed in order to bootstrap.

gcc/ChangeLog:

* doc/install.texi (Prerequisites): Add note that D front end now
requires GDC installed in order to bootstrap.
(Building): Add D compiler section, referencing prerequisites.

d: Update documentation of new D language options.

Adds documentation for the following:

    - New switch that controls what code is generated on a contract
      failure (throw or abort).
    - New switch that controls mangling of D types in `extern(C++)`
      code, as well as setting the compile-time value of
      `__traits(getTargetInfo "cppStd")`
    - New switches that generate C++ headers from D source files.
    - New switch to save expanded mixins to a file.
    - New switches that now distinguish between D language changes that
      are either (a) an experimental feature or an upcoming breaking
      change, (b) a warning or help on an upcoming change, or (c) revert
      of a change for users who don't want to deal with the breaking
      change for now.

gcc/d/ChangeLog:

* gdc.texi (Runtime Options): Document -fcheckaction=, -fextern-std=,
-fpreview=, -frevert=.
(Code Generation): Document -fdump-c++-spec=, -fdump-c++-spec-verbose,
-fsave-mixins=.
(Warnings): Update list of supported -ftransitions=.

[Ada] Fix incorrect fixed-point computation in expression function

gcc/ada/

* einfo.ads (E_Decimal_Fixed_Point_Subtype): Fix pasto.
* freeze.adb (Freeze_Fixed_Point_Type): Retrieve the underlying type
of the first subtype and do not use a stale value of Small_Value.
* sem_res.adb (Resolve_Real_Literal): In the case of a fixed-point
type, make sure that the base type is frozen and use its Small_Value
to compute the corresponding integer value of the literal.

[Ada] Tune whitespace of the bounded lists Aggregate aspect

gcc/ada/

* libgnat/a-cbdlli.ads (List): Remove extra space in Aggregate
aspect.

[Ada] Allow formal functions to have a default in the form of an expression function

gcc/ada/

* doc/gnat_rm/implementation_defined_pragmas.rst: Add
documentation of the new form of formal subprogram default in
the section on language extensions (pragma Extensions_Allowed).
* gnat_rm.texi: Regenerate.
* gen_il-gen-gen_nodes.adb: Add Expression as a syntactic field
of N_Formal_(Abstract|Concrete)_Subprogram_Declaration nodes.
* par-ch12.adb (P_Formal_Subprogram_Declaration): Add parsing
support for the new default of a parenthesized expression for
formal functions. Issue an error when extensions are not
allowed, suggesting use of -gnatX. Update comment with extended
syntax for SUBPROGRAM_DEFAULT.
* sem_ch12.adb (Analyze_Formal_Subprogram_Declaration): Issue an
error when an expression default is given for an abstract formal
function. When a default expression is present for a formal
function, install the function's formals and preanalyze the
expression.
(Instantiate_Formal_Subprogram): Fix typo in RM paragraph in a
comment.  When a formal function has a default expression,
create a body for the function that will evaluate the expression
and will be called when the default applies in an instantiation.
The implicit function is marked as inlined and as having
convention Intrinsic.

[Ada] Do not return freeze nodes for start of early call regions

gcc/ada/

* sem_elab.adb (Previous_Suitable_Construct): New function declared
in the Early_Call_Region_Processor package.
(Find_ECR): Call it to get the previous node at the start.
(Include): Call it to get the previous node during the traversal.

[Ada] Fix crash on pragma Compile_Time_Warning/Error

gcc/ada/

* sem_prag.adb (Process_Compile_Time_Warning_Or_Error): Do not
follow the Corresponding_Spec pointer if Acts_As_Spec is True,
because Corresponding_Spec is Empty in that case, so we would
exit the loop prematurely, and incorrectly think we are not
inside a generic unit when we are.

[Ada] Syntax error on "not null procedure"

gcc/ada/

* par-ch3.adb (P_Access_Type_Definition): If Not_Null_Subtype is
True, give an error in the access-to-subprogram cases.

[Ada] Tidy up freezing code for instantiations (continued)

gcc/ada/

* sem_ch12.adb (Freeze_Package_Instance): Move up.

[Ada] Tidy up freezing code for instantiations

gcc/ada/

* sem_ch12.adb (Freeze_Subprogram_Body): Rename into...
(Freeze_Subprogram_Instance): ...this and change the name of the
first parameter and local variables for the sake of consistency.
(Insert_Freeze_Node_For_Instance): Use local variable Par_Inst.
(Install_Body): Rename into...
(Freeze_Package_Instance): ...this, remove first parameter and
change the name of local variables for the sake of consistency.
Do not deal with the special case of incomplete actual types here
and do not insert the body.
(Instantiate_Package_Body): Deal with the special case of incomplete
actual types here and insert the body.  Call Freeze_Package_Instance
only if expansion is done.
(Instantiate_Subprogram_Body): Minor consistency tweak.

[Ada] Fix typo in comment

gcc/ada/

* sem_aggr.adb (Resolve_Aggregate): Fix typo in comment.

[Ada] Improve support for casing on types with controlled parts

gcc/ada/

* sem_case.adb (Check_Bindings): Provide a second strategy for
implementing bindings and choose which strategy to use for a
given binding. The previous approach was to introduce a new
object and assign the bound value to the object.  The new
approach is to introduce a renaming of a dereference of an
access value that references the appropriate subcomponent, so no
copies are made.  The original strategy is still used if the
type of the object is elementary.  When the renaming approach is
used, the initialization of the access value is not generated
until expansion. Until this missing initialization is added, the
tree looks like a known-at-compile-time dereference of a null
access value: Temp : Some_Access_Type; Obj : Designated_Type
renames Temp.all; This leads to problems, so a bogus initial
value is provided here and then later deleted during expansion.
(Check_Composite_Case_Selector): Disallow a case selector
expression that requires finalization. Note that it is ok if the
selector's type requires finalization, as long as the expression
itself doesn't have any "newly constructed" parts.
* exp_ch5.adb (Pattern_Match): Detect the case where analysis of
a general (i.e., composite selector type) case statement chose
to implement a binding as a renaming rather than by making a
copy. In that case, generate the assignments to initialize the
access-valued object whose designated value is later renamed
(and remove the bogus initial value for that object that was
added during analysis).
* sem_util.ads, sem_util.adb: Add new function
Is_Newly_Constructed corresponding to RM 4.4 term.

[Ada] Fix issues with ignored ghost code and unnesting

gcc/ada/

* frontend.adb (Frontend): Do unnesting after ignored ghost code
has been removed.
* inline.adb (Analyze_Inlined_Bodies): Don't put ignored ghost
entities on inlined subprogram list.

[Ada] Make Timed_Task_Entry_Call's defer_abort nestable

gcc/ada/

* libgnarl/s-tasren.adb (Timed_Task_Entry_Call): Replace
Defer_Abort and Undefer_Abort with Defer_Abort_Nestable and
Undefer_Abort_Nestable.

[Ada] Do not free task for _parent

gcc/ada/

* exp_ch7.adb (Cleanup_Record): Don't process parent.

[Ada] Spurious warning when using 'Type_Key on generic formal

gcc/ada/

* sem_attr.adb (Type_Key): Avoid premature use warnings when the
prefix is a generic actual.

[Ada] Create object file for ignored ghost compilation unit

gcc/ada/

* gnat1drv.adb (Gnat1drv): Force generation of object file if
compilation unit is an ignored ghost.

[Ada] RTEMS: add traceback support for AArch64

gcc/ada/

* tracebak.c: Add AArch64 RTEMS support.

[Ada] Add signal to exception mapping for RTEMS

gcc/ada/

* init.c: Add __gnat_error_handler and __gnat_install_handler
for RTEMS.

[Ada] Fix small discrepancy between -gnatG and -gnatD[G] outputs

gcc/ada/

* sprint.ads (Source_Dump): Fix typo in comment.
* sprint.adb (Source_Dump): Set Dump_Freeze_Null for both -gnatG
and -gnatD.
* switch-c.adb (Scan_Front_End_Switches) <'D'>: Remove obsolete
kludge.

[Ada] Improve error messages for dot notation when -gnatX not used

gcc/ada/

* einfo.ads (Direct_Primitive_Operations): Update the doc to
indicate that this field is used for all types now.
* sem_ch4.adb (Try_Object_Operation): Add parameter
Allow_Extensions set to True to pretend that extensions are
allowed.
* sem_ch4.ads: Same.
* sem_ch6.adb: Do not require Extensions_Allowed.
* sem_ch8.adb (Find_Selected_Component): Remove duplicate
"where" in comment.  Improve the error messages regarding use of
prefixed calls.

[Ada] Add query for extended precision floating-point types

gcc/ada/

* sem_util.adb (Is_Extended_Precision_Floating_Point_Type): New
function.
* sem_util.ads (Is_Extended_Precision_Floating_Point_Type): New
function.

[Ada] Replace low-level detection of subprograms with high-level wrapper

gcc/ada/

* exp_aggr.adb, sem_cat.adb, sem_ch10.adb, sem_ch12.adb,
sem_elim.adb, sem_util.adb: Replace uses of Subprogram_Kind with
Is_Subprogram.

[Ada] Sync whitespace between variants of Indefinite_Holders unit

gcc/ada/

* libgnat/a-coinho.ads: Sync whitespace with
a-coinho__shared.ads.
* libgnat/a-coinho__shared.ads: Sync whitespace with
a-coinho.ads.

[Ada] Sort list of Ada runtime units in Makefile.rtl

gcc/ada/

* Makefile.rtl (GNATRTL_TASKING_OBJS): Sort.
(GNATRTL_NONTASKING_OBJS): Sort.

[Ada] Whitespace cleanup in Makefile.rtl dependency rules

gcc/ada/

* Makefile.rtl: Remove extra whitespace in special compilation
rules.

[Ada] Document System.Atomic_Counters as supported on ARM and AARCH64

gcc/ada/

* doc/gnat_rm/the_gnat_library.rst (System.Atomic_Counters):
Sync description with comment in s-atocou.ads.
* gnat-style.texi, gnat_rm.texi, gnat_ugn.texi: Regenerate.

[Ada] Improve messages on incorrect state refinement in SPARK

gcc/ada/

* sem_ch10.adb (Is_Private_Library_Unit): Move query to
Sem_Util for sharing.
* sem_ch7.adb (Analyze_Package_Body_Helper): Add continuation
message.
* sem_prag.adb (Analyze_Part_Of): Call new function
Is_Private_Library_Unit.
(Check_Valid_Library_Unit_Pragma): Specialize error messages on
misplaced pragmas.
(Analyze_Refined_State_In_Decl_Part): Recognize missing Part_Of
on object in private part.
* sem_util.adb (Check_State_Refinements): Add continuation
message.
(Find_Placement_In_State_Space): Fix detection of placement,
which relied wrongly on queries In_Package_Body/In_Private_Part
which do not provide the right information here for all cases.
(Is_Private_Library_Unit): Move query here for sharing.
* sem_util.ads (Is_Private_Library_Unit): Move query here for
sharing.

[Ada] Storage error on untagged prefixed subprogram calls with -gnatX

gcc/ada/

* sem_ch3.adb (Analyze_Full_Type_Declaration): If the full type
has a primitives list but its base type doesn't, set the base
type's list to the full type's list (covers certain constrained
cases, such as for arrays).
(Analyze_Incomplete_Type_Decl): Unconditionally initialize an
incomplete type's primitives list.
(Analyze_Subtype_Declaration): Unconditionally set a subtype's
primitives list to the base type's list, so the lists are
shared.
(Build_Derived_Private_Type): Unconditionally initialize a
derived private type's list to a new empty list.
(Build_Derived_Record_Type): Unconditionally initialize a
derived record type's list to a new empty list (now a single
call for tagged and untagged cases).
(Derived_Type_Declaration): Unconditionally initialize a derived
type's list to a new empty list in error cases (when Parent_Type
is undefined or illegal).
(Process_Full_View): Unconditionally copy the primitive
operations from the private view to the full view (rather than
conditioning it on whether extensions are enabled).
* sem_ch7.adb (New_Private_Type): Unconditionally initialize an
untagged private type's primitives list to a new empty list.

[Ada] Avoid duplication for Sets functions

gcc/ada/

* libgnat/a-cbhase.adb, libgnat/a-cborse.adb,
libgnat/a-cihase.adb, libgnat/a-ciorse.adb,
libgnat/a-cohase.adb, libgnat/a-coorse.adb
(Constant_Reference,Reference_Preserving_Key): Refactor using
the equivalence stated in the RM.

[Ada] Simplify building of inequality function body

gcc/ada/

* exp_ch3.adb (Make_Eq_Body): Refactor to avoid appending to an
empty list; also, when exiting early we will not create any
list; fix style in comment.

[Ada] Cleanup listing of representation info

gcc/ada/

* repinfo.adb (List_Entities): Simplify detection of entries;
refactor potentially redundant comparison.

i386: Fix up some minor formatting issues and one inconsistency

While looking at a proposed vendor backport, I've noticed some
formatting issues in x86-tune.def.  Also, in all spots m_GENERIC
comes last, except one recently changed, I think it is useful to have
m_GENERIC always last for consistency.

2021-12-01  Jakub Jelinek  <jakub@redhat.com>

* config/i386/x86-tune.def (X86_TUNE_SCHEDULE,
X86_TUNE_SSE_PARTIAL_REG_FP_CONVERTS_DEPENDENCY,
X86_TUNE_MISALIGNED_MOVE_STRING_PRO_EPILOGUES): Formatting fixes.
(X86_TUNE_USE_GATHER): Put m_GENERIC last for consistency.

libcpp: Enable P1949R7 for C++98 too [PR100977]

On Mon, Nov 29, 2021 at 05:53:58PM -0500, Jason Merrill wrote:
> I'm inclined to go ahead and change C++98 as well; I doubt anyone is relying
> on the particular C++98 extended character set rules, and we already accept
> the union of the different sets when not pedantic.

Ok, here is an incremental patch to do that also for -std={c,gnu}++98.

2021-12-01  Jakub Jelinek  <jakub@redhat.com>

PR c++/100977
* init.c (struct lang_flags): Remove cxx23_identifiers.
(lang_defaults): Remove cxx23_identifiers initializers.
(cpp_set_lang): Don't copy cxx23_identifiers.
* include/cpplib.h (struct cpp_options): Adjust comment about
c11_identifiers.  Remove cxx23_identifiers field.
* lex.c (warn_about_normalization): Use cplusplus instead of
cxx23_identifiers.
* charset.c (ucn_valid_in_identifier): Likewise.

* g++.dg/cpp/ucnid-1.C: Adjust expected diagnostics.
* g++.dg/cpp/ucnid-1-utf8.C: Likewise.

simplify-rtx: Punt on simplify_associative_operation with large operands [PR102356]

Seems simplify_associate_operation is quadratic, which isn't a big deal
for use during combine and other similar RTL passes, because those never
try to combine expressions from more than a few instructions and because
those instructions need to be recognized the machine description also bounds
how many expressions can appear in there.
var-tracking has depth limits only for some cases and unlimited depth
for the vt_expand_loc though:
 /* This is the value used during expansion of locations.  We want it
    to be unbounded, so that variables expanded deep in a recursion
    nest are fully evaluated, so that their values are cached
    correctly.  We avoid recursion cycles through other means, and we
    don't unshare RTL, so excess complexity is not a problem.  */
 #define EXPR_DEPTH (INT_MAX)
 /* We use this to keep too-complex expressions from being emitted as
    location notes, and then to debug information.  Users can trade
    compile time for ridiculously complex expressions, although they're
    seldom useful, and they may often have to be discarded as not
    representable anyway.  */
 #define EXPR_USE_DEPTH (param_max_vartrack_expr_depth)

IMO for very large expressions it isn't worth trying to reassociate though,
in fact e.g. for the new testcase below keeping it as is has bigger chance
of generating smaller debug info which the dwarf2out.c part of the change
tries to achieve - if a binary operation has the same operands, we can
use DW_OP_dup and not bother computing the possibly large operand again.

The patch fixes it by adding a counter to simplify_context and counting
how many times simplify_associative_operation has been called during
a single outermost simplify_* call, and once it reaches some maximum
(currently 64), it stops reassociating.

Another possibility to deal with the power expressions in debug info
would be to introduce some new RTL operation for the pow{,i} (x, n)
case, allow that solely in debug insns and expand those into DWARF
using a loop.  But that seems like quite a lot of work for something rarely
used (especially when powi for larger n is only useful for 0 and 1 inputs
because anything else overflows).

2021-12-01  Jakub Jelinek  <jakub@redhat.com>

PR rtl-optimization/102356
* rtl.h (simplify_context): Add assoc_count member and
max_assoc_count static member.
* simplify-rtx.c (simplify_associative_operation): Don't reassociate
more than max_assoc_count times within one outermost simplify_* call.
* dwarf2out.c (mem_loc_descriptor): Optimize binary operation
with both operands the same using DW_OP_dup.

* gcc.dg/pr102356.c: New test.

libcpp: Fix up #__VA_OPT__ handling [PR103415]

stringify_arg uses pfile->u_buff to create the string literal.
Unfortunately, paste_tokens -> _cpp_lex_direct -> lex_number -> _cpp_unaligned_alloc
can in some cases use pfile->u_buff too, which results in losing everything
prepared for the string literal until the token pasting.

The following patch fixes that by not calling paste_token during the
construction of the string literal, but doing that before.  All the tokens
we are processing have been pushed into a token buffer using
tokens_buff_add_token so it is fine if we paste some of them in that buffer
(successful pasting creates a new token in that buffer), move following
tokens if any to make it contiguous, pop (throw away) the extra tokens at
the end and then do stringify_arg.

Also, paste_tokens now copies over PREV_WHITE and PREV_FALLTHROUGH flags
from the original lhs token to the replacement token.  Copying that way
the PREV_WHITE flag is needed for the #__VA_OPT__ handling and copying
over PREV_FALLTHROUGH fixes the new Wimplicit-fallthrough-38.c test.

2021-12-01  Jakub Jelinek  <jakub@redhat.com>

PR preprocessor/103415
libcpp/
* macro.c (stringify_arg): Remove va_opt argument and va_opt handling.
(paste_tokens): On successful paste or in PREV_WHITE and
PREV_FALLTHROUGH flags from the *plhs token to the new token.
(replace_args): Adjust stringify_arg callers.  For #__VA_OPT__,
perform token pasting in a separate loop before stringify_arg call.
gcc/testsuite/
* c-c++-common/cpp/va-opt-8.c: New test.
* c-c++-common/Wimplicit-fallthrough-38.c: New test.

middle-end: move bitmask match.pd pattern and update tests

Following the previous bugfix this addresses the cosmetic and test issues.

The vector tests are moved to vect and the scalar are left where they are.

gcc/ChangeLog:

* match.pd: Move below pattern that rewrites to EQ, NE.
* tree.c (bitmask_inv_cst_vector_p): Correct do .. while indentation.

gcc/testsuite/ChangeLog:

* gcc.dg/bic-bitmask-10.c: Moved to gcc.dg/vect/vect-bic-bitmask-10.c.
* gcc.dg/bic-bitmask-11.c: Moved to gcc.dg/vect/vect-bic-bitmask-11.c.
* gcc.dg/bic-bitmask-12.c: Moved to gcc.dg/vect/vect-bic-bitmask-12.c.
* gcc.dg/bic-bitmask-3.c: Moved to gcc.dg/vect/vect-bic-bitmask-3.c.
* gcc.dg/bic-bitmask-23.c: Moved to gcc.dg/vect/vect-bic-bitmask-23.c.
* gcc.dg/bic-bitmask-2.c: Moved to gcc.dg/vect/vect-bic-bitmask-2.c.
* gcc.dg/bic-bitmask-4.c: Moved to gcc.dg/vect/vect-bic-bitmask-4.c.
* gcc.dg/bic-bitmask-5.c: Moved to gcc.dg/vect/vect-bic-bitmask-5.c.
* gcc.dg/bic-bitmask-6.c: Moved to gcc.dg/vect/vect-bic-bitmask-6.c.
* gcc.dg/bic-bitmask-8.c: Moved to gcc.dg/vect/vect-bic-bitmask-8.c.
* gcc.dg/bic-bitmask-9.c: Moved to gcc.dg/vect/vect-bic-bitmask-9.c.

tree-optimization/103456 - Record only successes from object_sizes_set

Avoid overwriting osi->changed if object_sizes_set does not update the
size, so that a previous success in the same pass is not overwritten.
This fixes the bootstrap-ubsan build config, which was failing due to
incorrect object size.

gcc/ChangeLog:

PR tree-optimization/103456
* tree-object-size.c (merge_object_sizes): Update osi->changed
only if object_sizes_set succeeded.

gcc/testsuite/ChangeLog:

PR tree-optimization/103456
* gcc.dg/ubsan/pr103456.c: New test.

Co-authored-by: Martin Liška <mliska@suse.cz>
Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org>

Daily bump.

Fix ICE in ix86_attr_length_immediate_default.

ix86_attr_length_immediate_default assume TYPE ishift only have 1
constant operand,
but *x86_64_shld_1/*x86_shld_1/*x86_64_shrd_1/*x86_shrd_1 has 2, with
condition: INTVAL (operands[3]) == 32 - INTVAL (operands[2]) or
INTVAL (operands[3]) == 64 - INTVAL (operands[2]), and hit
gcc_assert.
Explicitly set_attr length_immediate for these patterns.

gcc/ChangeLog:

PR target/103463
PR target/103484
* config/i386/i386.md (*x86_64_shld_1): Set_attr
length_immediate to 1.
(*x86_shld_1): Ditto.
(*x86_64_shrd_1): Ditto.
(*x86_shrd_1): Ditto.

gcc/testsuite/ChangeLog:

* gcc.target/i386/pr103463.c: New test.
* gcc.target/i386/pr103463-2.c: New test.

rs6000: Clarify overloaded builtin diagnostic

When a built-in function required by an overloaded function name is not
currently enabled, the diagnostic message is not as clear as it should be.
Saying that one built-in "requires" another is somewhat misleading.  It is
better to explicitly state that the overloaded builtin is implemented by the
missing builtin.

2021-11-23  Bill Schmidt  <wschmidt@linux.ibm.com>

gcc/
* config/rs6000/rs6000-c.c (altivec_resolve_overloaded_builtin):
Clarify diagnostic.
(altivec_resolve_new_overloaded_builtin): Likewise.

libstdc++: Fix tests that fail with fully-dynamic-string

Fix some tests that assume that a moved-from string is empty, or that
default constructing a string doesn't allocate.

libstdc++-v3/ChangeLog:

* testsuite/21_strings/basic_string/cons/char/moveable.cc: Allow
moved-from string to be non-empty.
* testsuite/21_strings/basic_string/cons/char/moveable2.cc:
Likewise.
* testsuite/21_strings/basic_string/cons/char/moveable2_c++17.cc:
Likewise.
* testsuite/21_strings/basic_string/cons/wchar_t/moveable.cc:
Likewise.
* testsuite/21_strings/basic_string/cons/wchar_t/moveable2.cc:
Likewise.
* testsuite/21_strings/basic_string/cons/wchar_t/moveable2_c++17.cc:
Likewise.
* testsuite/21_strings/basic_string/modifiers/assign/char/87749.cc:
Construct empty string before setting oom flag.
* testsuite/21_strings/basic_string/modifiers/assign/wchar_t/87749.cc:
Likewise.

libstdc++: Fix fully-dynamic-string build

My last change to the fully-dynamic-string actually broke it. This fixes
the move constructor so it builds, and simplifies it slightly so that
more code is common between the fully-dynamic enabled/disabled cases.

libstdc++-v3/ChangeLog:

* include/bits/cow_string.h (basic_string(basic_string&&)): Fix
mem-initializer for _GLIBCXX_FULLY_DYNAMIC_STRING==0 case.
* testsuite/21_strings/basic_string/cons/char/noexcept_move_construct.cc:
Remove outdated comment.
* testsuite/21_strings/basic_string/cons/wchar_t/noexcept_move_construct.cc:
Likewise.

libstdc++: Ensure C++20 std::stringstream definitions use correct ABI

The definitions of the new C++20 members of std::stringstream etc are
missing when --with-default-libstdcxx-abi=gcc4-compatible is used,
because all the explicit instantiations in src/c++20/sstream-inst.cc are
skipped.

This ensures the contents of that file are compiled with the new ABI, so
the same set of symbols are exported regardless of which ABI is active
by default.

libstdc++-v3/ChangeLog:

* src/c++20/sstream-inst.cc (_GLIBCXX_USE_CXX11_ABI): Define to
select new ABI.

analyzer: add regression test [PR94579]

gcc/testsuite/ChangeLog:
PR analyzer/94579
* gcc.dg/analyzer/pr94579.c: New test.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

analyzer: add regression test [PR99269]

gcc/testsuite/ChangeLog:
PR analyzer/99269
* gcc.dg/analyzer/pr99269.c: New test.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

analyzer: verify that -Wanalyzer-too-complex can be disabled via pragmas [PR100524]

gcc/testsuite/ChangeLog:
PR analyzer/100524
* gcc.dg/analyzer/pragma-2.c: New test.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

Fortran: improve expansion of constant array expressions within constructors

gcc/fortran/ChangeLog:

PR fortran/102787
* array.c (expand_constructor): When encountering a constant array
expression or array section within a constructor, simplify it to
enable better expansion.

gcc/testsuite/ChangeLog:

* gfortran.dg/array_constructor_54.f90: New test.

c++: don't fold away 'if' with constant condition

richi's recent unreachable code warning experiments had trouble with the C++
front end folding away an 'if' with a constant condition.  Let's do less
folding at the statement level.

gcc/cp/ChangeLog:

* cp-gimplify.c (genericize_if_stmt): Always build a COND_EXPR.

libstdc++: Skip tag dispatching for _S_relocate in C++17

In C++17 mode all callers of _S_relocate have already done:

  if constexpr (_S_use_relocate())

so we don't need to repeat that check and use tag dispatching to avoid
ill-formed instantiations.

libstdc++-v3/ChangeLog:

* include/bits/stl_vector.h (vector::_S_do_relocate): Remove
C++20 constexpr specifier.
(vector::_S_relocate) [__cpp_if_constexpr]: Call __relocate_a
directly without tag dispatching.

libstdc++: Make Asan detection work for Clang [PR103453]

Clang doesn't define __SANITIZE_ADDRESS__ so use its __has_feature check
to detect Asan instead.

libstdc++-v3/ChangeLog:

PR libstdc++/103453
* config/allocator/malloc_allocator_base.h
(_GLIBCXX_SANITIZE_STD_ALLOCATOR): Define for Clang.
* config/allocator/new_allocator_base.h
(_GLIBCXX_SANITIZE_STD_ALLOCATOR): Likewise.

Fortran: error recovery when simplifying MINLOC/MAXLOC

gcc/fortran/ChangeLog:

PR fortran/103473
* simplify.c (simplify_minmaxloc_nodim): Avoid NULL pointer
dereference when shape is not set.

gcc/testsuite/ChangeLog:

PR fortran/103473
* gfortran.dg/minmaxloc_15.f90: New test.

Fortran: check type of SUB argument to IMAGE_INDEX

gcc/fortran/ChangeLog:

PR fortran/101565
* check.c (gfc_check_image_index): Verify that SUB argument to
IMAGE_INDEX is of type integer.

gcc/testsuite/ChangeLog:

PR fortran/101565
* gfortran.dg/coarray_49.f90: New test.

Co-authored-by: Steven G. Kargl <kargl@gcc.gnu.org>

ipa-sra: Check also ECF_LOOPING_CONST_OR_PURE when evaluating calls

in PR 103267 Honza found out that IPA-SRA does not look at
ECF_LOOPING_CONST_OR_PURE when evaluating if a call can have side
effects.  Fixed with this patch.  The testcase infinitely loops in a
const function, so it would not make a good addition to the testsuite.

gcc/ChangeLog:

2021-11-29  Martin Jambor  <mjambor@suse.cz>

PR ipa/103267
* ipa-sra.c (scan_function): Also check ECF_LOOPING_CONST_OR_PURE flag.

vect: Fix ncopies calculation for emulated gather/scatter [PR103494]

I was too eager about removing ncopies calculations in g:10833849b55.
When emulating gather/scatter, the offset ncopies can be different from
the data ncopies.  This patch restores the original calculation.

gcc/
PR tree-optimization/103494
* tree-vect-stmts.c (vect_get_gather_scatter_ops): Remove ncopies
argument and calculate ncopies from gs_info->offset_vectype
where necessary.
(vectorizable_store, vectorizable_load): Update accordingly.

gcc/testsuite/
PR tree-optimization/103494
* gcc.dg/vect/pr103494.c: New test.
* g++.dg/vect/pr103494.cc: Likewise.

d: Import dmd b8384668f, druntime e6caaab9, phobos 5ab9ad256 (v2.098.0-beta.1)

The D front-end is now itself written in D, in order to build GDC, you
will need a working GDC compiler (GCC version 9.1 or later).

GCC changes:

    - Add support for bootstrapping the D front-end.

These add the required components in order to have a D front-end written
in D itself.  Because the compiler front-end only depends on the core
runtime modules, only libdruntime is built for the bootstrap stages.

D front-end changes:

    - Import dmd v2.098.0-beta.1.

Druntime changes:

    - Import druntime v2.098.0-beta.1.

Phobos changes:

    - Import phobos v2.098.0-beta.1.

The jump from v2.076.1 to v2.098.0 covers nearly 4 years worth of
development on the D programming language and run-time libraries.

ChangeLog:

* Makefile.def: Add bootstrap to libbacktrace, libphobos, zlib, and
libatomic.
* Makefile.in: Regenerate.
* Makefile.tpl (POSTSTAGE1_HOST_EXPORTS): Fix command for GDC.
(STAGE1_CONFIGURE_FLAGS): Add --with-libphobos-druntime-only if
target-libphobos-bootstrap.
(STAGE2_CONFIGURE_FLAGS): Likewise.
* configure: Regenerate.
* configure.ac: Add support for bootstrapping D front-end.

config/ChangeLog:

* acx.m4 (ACX_PROG_GDC): New m4 function.

gcc/ChangeLog:

* Makefile.in (GDC): New variable.
(GDCFLAGS): New variable.
* configure: Regenerate.
* configure.ac: Add call to ACX_PROG_GDC.  Substitute GDCFLAGS.

gcc/d/ChangeLog:

* dmd/MERGE: Merge upstream dmd b8384668f.
* Make-lang.in (d-warn): Use strict warnings.
(DMD_WARN_CXXFLAGS): Remove.
(DMD_COMPILE): Remove.
(CHECKING_DFLAGS): Define.
(WARN_DFLAGS): Define.
(ALL_DFLAGS): Define.
(DCOMPILE.base): Define.
(DCOMPILE): Define.
(DPOSTCOMPILE): Define.
(DLINKER): Define.
(DLLINKER): Define.
(D_FRONTEND_OBJS): Add new dmd front-end objects.
(D_GENERATED_SRCS): Remove.
(D_GENERATED_OBJS): Remove.
(D_ALL_OBJS): Remove D_GENERATED_OBJS.
(d21$(exeext)): Build using DLLINKER and -static-libphobos.
(d.tags): Remove dmd/*.c and dmd/root/*.c.
(d.mostlyclean): Remove D_GENERATED_SRCS, d/idgen$(build_exeext),
d/impcnvgen$(build_exeext).
(D_INCLUDES): Include $(srcdir)/d/dmd/res.
(CFLAGS-d/id.o): Remove.
(CFLAGS-d/impcnvtab.o): Remove.
(d/%.o): Build using DCOMPILE and DPOSTCOMPILE.  Update dependencies
from d/dmd/%.c to d/dmd/%.d.
(d/idgen$(build_exeext)): Remove.
(d/impcnvgen$(build_exeext)): Remove.
(d/id.c): Remove.
(d/id.h): Remove.
(d/impcnvtab.c): Remove.
(d/%.dmdgen.o): Remove.
(D_SYSTEM_H): Remove.
(d/idgen.dmdgen.o): Remove.
(d/impcnvgen.dmdgen.o): Remove.
* config-lang.in (boot_language): New variable.
* d-attribs.cc: Include dmd/expression.h.
* d-builtins.cc: Include d-frontend.h.
(build_frontend_type): Update for new front-end interface.
(d_eval_constant_expression): Likewise.
(d_build_builtins_module): Likewise.
(maybe_set_builtin_1): Likewise.
(d_build_d_type_nodes): Likewise.
* d-codegen.cc (d_decl_context): Likewise.
(declaration_reference_p): Likewise.
(declaration_type): Likewise.
(parameter_reference_p): Likewise.
(parameter_type): Likewise.
(get_array_length): Likewise.
(build_delegate_cst): Likewise.
(build_typeof_null_value): Likewise.
(identity_compare_p): Likewise.
(lower_struct_comparison): Likewise.
(build_filename_from_loc): Likewise.
(build_assert_call): Remove LIBCALL_SWITCH_ERROR.
(build_bounds_index_condition): Call LIBCALL_ARRAYBOUNDS_INDEXP on
bounds error.
(build_bounds_slice_condition): Call LIBCALL_ARRAYBOUNDS_SLICEP on
bounds error.
(array_bounds_check): Update for new front-end interface.
(checkaction_trap_p): Handle CHECKACTION_context.
(get_function_type): Update for new front-end interface.
(d_build_call): Likewise.
* d-compiler.cc: Remove include of dmd/scope.h.
(Compiler::genCmain): Remove.
(Compiler::paintAsType): Update for new front-end interface.
(Compiler::onParseModule): Likewise.
* d-convert.cc (convert_expr): Remove call to LIBCALL_ARRAYCAST.
(convert_for_rvalue): Update for new front-end interface.
(convert_for_assignment): Likewise.
(convert_for_condition): Likewise.
(d_array_convert): Likewise.
* d-diagnostic.cc (error): Remove.
(errorSupplemental): Remove.
(warning): Remove.
(warningSupplemental): Remove.
(deprecation): Remove.
(deprecationSupplemental): Remove.
(message): Remove.
(vtip): New.
* d-frontend.cc (global): Remove.
(Global::_init): Remove.
(Global::startGagging): Remove.
(Global::endGagging): Remove.
(Global::increaseErrorCount): Remove.
(Loc::Loc): Remove.
(Loc::toChars): Remove.
(Loc::equals): Remove.
(isBuiltin): Update for new front-end interface.
(eval_builtin): Likewise.
(getTypeInfoType): Likewise.
(inlineCopy): Remove.
* d-incpath.cc: Include d-frontend.h.
(add_globalpaths): Call d_gc_malloc to allocate Strings.
(add_filepaths): Likewise.
* d-lang.cc: Include dmd/id.h, dmd/root/file.h, d-frontend.h.  Remove
include of dmd/mars.h, id.h.
(entrypoint_module): Remove.
(entrypoint_root_module): Remove.
(deps_write_string): Update for new front-end interface.
(deps_write): Likewise.
(d_init_options): Call rt_init.  Remove setting global params that are
default initialized by the front-end.
(d_handle_option): Handle OPT_fcheckaction_, OPT_fdump_c___spec_,
OPT_fdump_c___spec_verbose, OPT_fextern_std_, OPT_fpreview,
OPT_revert, OPT_fsave_mixins_, and OPT_ftransition.
(d_post_options): Propagate dip1021 and dip1000 preview flags to
dip25, and flag_diagnostics_show_caret to printErrorContext.
(d_add_entrypoint_module): Remove.
(d_parse_file): Update for new front-end interface.
(d_type_promotes_to): Likewise.
(d_types_compatible_p): Likewise.
* d-longdouble.cc (CTFloat::zero): Remove.
(CTFloat::one): Remove.
(CTFloat::minusone): Remove.
(CTFloat::half): Remove.
* d-system.h (POSIX): Remove.
(realpath): Remove.
(isalpha): Remove.
(isalnum): Remove.
(isdigit): Remove.
(islower): Remove.
(isprint): Remove.
(isspace): Remove.
(isupper): Remove.
(isxdigit): Remove.
(tolower): Remove.
(_mkdir): Remove.
(INT32_MAX): Remove.
(INT32_MIN): Remove.
(INT64_MIN): Remove.
(UINT32_MAX): Remove.
(UINT64_MAX): Remove.
* d-target.cc: Include calls.h.
(target): Remove.
(define_float_constants): Remove initialization of snan.
(Target::_init): Update for new front-end interface.
(Target::isVectorTypeSupported): Likewise.
(Target::isVectorOpSupported): Remove cases for unordered operators.
(TargetCPP::typeMangle): Update for new front-end interface.
(TargetCPP::parameterType): Likewise.
(Target::systemLinkage): Likewise.
(Target::isReturnOnStack): Likewise.
(Target::isCalleeDestroyingArgs): Define.
(Target::preferPassByRef): Define.
* d-tree.h (d_add_entrypoint_module): Remove.
* decl.cc (gcc_attribute_p): Update for new front-end interface.
(apply_pragma_crt): Define.
(DeclVisitor::visit(PragmaDeclaration *)): Handle pragmas
crt_constructor and crt_destructor.
(DeclVisitor::visit(TemplateDeclaration *)): Update for new front-end
interface.
(DeclVisitor::visit): Likewise.
(DeclVisitor::finish_vtable): Likewise.
(get_symbol_decl): Error if template has more than one nesting
context.  Update for new front-end interface.
(make_thunk): Update for new front-end interface.
(get_vtable_decl): Likewise.
* expr.cc (ExprVisitor::visit): Likewise.
(build_return_dtor): Likewise.
* imports.cc (ImportVisitor::visit): Likewise.
* intrinsics.cc: Include dmd/expression.h.  Remove include of
dmd/mangle.h.
(maybe_set_intrinsic): Update for new front-end interface.
* intrinsics.def (INTRINSIC_ROL): Update intrinsic signature.
(INTRINSIC_ROR): Likewise.
(INTRINSIC_ROR_TIARG): Likewise.
(INTRINSIC_TOPREC): Likewise.
(INTRINSIC_TOPRECL): Likewise.
(INTRINSIC_TAN): Update intrinsic module and signature.
(INTRINSIC_ISNAN): Likewise.
(INTRINSIC_ISFINITE): Likewise.
(INTRINSIC_COPYSIGN): Define intrinsic.
(INTRINSIC_COPYSIGNI): Define intrinsic.
(INTRINSIC_EXP): Update intrinsic module.
(INTRINSIC_EXPM1): Likewise.
(INTRINSIC_EXP2): Likewise.
(INTRINSIC_LOG): Likewise.
(INTRINSIC_LOG2): Likewise.
(INTRINSIC_LOG10): Likewise.
(INTRINSIC_POW): Likewise.
(INTRINSIC_ROUND): Likewise.
(INTRINSIC_FLOORF): Likewise.
(INTRINSIC_FLOOR): Likewise.
(INTRINSIC_FLOORL): Likewise.
(INTRINSIC_CEILF): Likewise.
(INTRINSIC_CEIL): Likewise.
(INTRINSIC_CEILL): Likewise.
(INTRINSIC_TRUNC): Likewise.
(INTRINSIC_FMIN): Likewise.
(INTRINSIC_FMAX): Likewise.
(INTRINSIC_FMA): Likewise.
(INTRINSIC_VA_ARG): Update intrinsic signature.
(INTRINSIC_VASTART): Likewise.
* lang.opt (fcheck=): Add alternate aliases for contract switches.
(fcheckaction=): New option.
(check_action): New Enum and EnumValue entries.
(fdump-c++-spec-verbose): New option.
(fdump-c++-spec=): New option.
(fextern-std=): New option.
(extern_stdcpp): New Enum and EnumValue entries
(fpreview=): New options.
(frevert=): New options.
(fsave-mixins): New option.
(ftransition=): Update options.
* modules.cc (get_internal_fn): Replace Prot with Visibility.
(build_internal_fn): Likewise.
(build_dso_cdtor_fn): Likewise.
(build_module_tree): Remove check for __entrypoint module.
* runtime.def (P5): Define.
(ARRAYBOUNDS_SLICEP): Define.
(ARRAYBOUNDS_INDEXP): Define.
(NEWTHROW): Define.
(ADCMP2): Remove.
(ARRAYCAST): Remove.
(SWITCH_STRING): Remove.
(SWITCH_USTRING): Remove.
(SWITCH_DSTRING): Remove.
(SWITCH_ERROR): Remove.
* toir.cc (IRVisitor::visit): Update for new front-end interface.
(IRVisitor::check_previous_goto): Remove checks for case and default
statements.
(IRVisitor::visit(SwitchStatement *)): Remove handling of string
switch conditions.
* typeinfo.cc: Include d-frontend.h.
(get_typeinfo_kind): Update for new front-end interface.
(make_frontend_typeinfo): Likewise.
(TypeInfoVisitor::visit): Likewise.
(builtin_typeinfo_p): Likewise.
(get_typeinfo_decl): Likewise.
(build_typeinfo): Likewise.
* types.cc (valist_array_p): Likewise.
(make_array_type): Likewise.
(merge_aggregate_types): Likewise.
(TypeVisitor::visit(TypeBasic *)): Likewise.
(TypeVisitor::visit(TypeFunction *)): Likewise.
(TypeVisitor::visit(TypeStruct *)): Update comment.
* verstr.h: Removed.
* d-frontend.h: New file.

gcc/po/ChangeLog:

* EXCLUDES: Remove d/dmd sources from list.

gcc/testsuite/ChangeLog:

* gdc.dg/Wcastresult2.d: Update test.
* gdc.dg/asm1.d: Likewise.
* gdc.dg/asm2.d: Likewise.
* gdc.dg/asm3.d: Likewise.
* gdc.dg/gdc282.d: Likewise.
* gdc.dg/imports/gdc170.d: Likewise.
* gdc.dg/intrinsics.d: Likewise.
* gdc.dg/pr101672.d: Likewise.
* gdc.dg/pr90650a.d: Likewise.
* gdc.dg/pr90650b.d: Likewise.
* gdc.dg/pr94777a.d: Likewise.
* gdc.dg/pr95250.d: Likewise.
* gdc.dg/pr96869.d: Likewise.
* gdc.dg/pr98277.d: Likewise.
* gdc.dg/pr98457.d: Likewise.
* gdc.dg/simd1.d: Likewise.
* gdc.dg/simd2a.d: Likewise.
* gdc.dg/simd2b.d: Likewise.
* gdc.dg/simd2c.d: Likewise.
* gdc.dg/simd2d.d: Likewise.
* gdc.dg/simd2e.d: Likewise.
* gdc.dg/simd2f.d: Likewise.
* gdc.dg/simd2g.d: Likewise.
* gdc.dg/simd2h.d: Likewise.
* gdc.dg/simd2i.d: Likewise.
* gdc.dg/simd2j.d: Likewise.
* gdc.dg/simd7951.d: Likewise.
* gdc.dg/torture/gdc309.d: Likewise.
* gdc.dg/torture/pr94424.d: Likewise.
* gdc.dg/torture/pr94777b.d: Likewise.
* lib/gdc-utils.exp (gdc-convert-args): Handle new compiler options.
(gdc-convert-test): Handle CXXFLAGS, EXTRA_OBJC_SOURCES, and ARG_SETS
test directives.
(gdc-do-test): Only import modules in the test run directory.
* gdc.dg/pr94777c.d: New test.
* gdc.dg/pr96156b.d: New test.
* gdc.dg/pr96157c.d: New test.
* gdc.dg/simd_ctfe.d: New test.
* gdc.dg/torture/simd17344.d: New test.
* gdc.dg/torture/simd20052.d: New test.
* gdc.dg/torture/simd6.d: New test.
* gdc.dg/torture/simd7.d: New test.

libphobos/ChangeLog:

* libdruntime/MERGE: Merge upstream druntime e6caaab9.
* libdruntime/Makefile.am (D_EXTRA_FLAGS): Build libdruntime with
-fpreview=dip1000, -fpreview=fieldwise, and -fpreview=dtorfields.
(ALL_DRUNTIME_SOURCES): Add DRUNTIME_DSOURCES_STDCXX.
(DRUNTIME_DSOURCES): Update list of C binding modules.
(DRUNTIME_DSOURCES_STDCXX): Likewise.
(DRUNTIME_DSOURCES_LINUX): Likewise.
(DRUNTIME_DSOURCES_OPENBSD): Likewise.
(DRUNTIME_DISOURCES): Remove __entrypoint.di.
* libdruntime/Makefile.in: Regenerated.
* libdruntime/__entrypoint.di: Removed.
* libdruntime/gcc/deh.d (_d_isbaseof): Update signature.
(_d_createTrace): Likewise.
(__gdc_begin_catch): Remove reference to the exception.
(_d_throw): Increment reference count of thrown object before unwind.
(__gdc_personality): Chain exceptions with  Throwable.chainTogether.
* libdruntime/gcc/emutls.d: Update imports.
* libdruntime/gcc/sections/elf.d: Update imports.
(DSO.moduleGroup): Update signature.
* libdruntime/gcc/sections/macho.d: Update imports.
(DSO.moduleGroup): Update signature.
* libdruntime/gcc/sections/pecoff.d: Update imports.
(DSO.moduleGroup): Update signature.
* src/MERGE: Merge upstream phobos 5ab9ad256.
* src/Makefile.am (D_EXTRA_DFLAGS): Add -fpreview=dip1000 and
-fpreview=dtorfields flags.
(PHOBOS_DSOURCES): Update list of std modules.
* src/Makefile.in: Regenerate.
* testsuite/lib/libphobos.exp (libphobos-dg-test): Handle assembly
compile types.
(dg-test): Override.
(additional_prunes): Define.
(libphobos-dg-prune): Filter any additional_prunes set by tests.
* testsuite/libphobos.aa/test_aa.d: Update test.
* testsuite/libphobos.druntime/druntime.exp (version_flags): Add
-fversion=CoreUnittest.
* testsuite/libphobos.druntime_shared/druntime_shared.exp
(version_flags): Add -fversion=CoreUnittest -fversion=Shared.
* testsuite/libphobos.exceptions/unknown_gc.d: Update test.
* testsuite/libphobos.hash/test_hash.d: Update test.
* testsuite/libphobos.phobos/phobos.exp (version_flags): Add
-fversion=StdUnittest
* testsuite/libphobos.phobos_shared/phobos_shared.exp (version_flags):
Likewise.
* testsuite/libphobos.shared/host.c: Update test.
* testsuite/libphobos.shared/load.d: Update test.
* testsuite/libphobos.shared/load_13414.d: Update test.
* testsuite/libphobos.thread/fiber_guard_page.d: Update test.
* testsuite/libphobos.thread/tlsgc_sections.d: Update test.
* testsuite/testsuite_flags.in: Add -fpreview=dip1000 to --gdcflags.
* testsuite/libphobos.shared/link_mod_collision.d: Removed.
* testsuite/libphobos.shared/load_mod_collision.d: Removed.
* testsuite/libphobos.betterc/betterc.exp: New test.
* testsuite/libphobos.config/config.exp: New test.
* testsuite/libphobos.gc/gc.exp: New test.
* testsuite/libphobos.imports/imports.exp: New test.
* testsuite/libphobos.lifetime/lifetime.exp: New test.
* testsuite/libphobos.unittest/unittest.exp: New test.

ipa-param-manip: Be careful about a reallocating hash_map

PR 103449 revealed that when I was storing result of one hash_map
lookup into another entry in the hash_map, I was still accessing the
entry in the table, which meanwhile could get reallocated, making the
accesses invalid-after-free.

Fixed with the following, which also simplifies the return statement
which must have been true even now.

gcc/ChangeLog:

2021-11-29  Martin Liska  <mliska@suse.cz>
    Martin Jambor  <mjambor@suse.cz>

PR ipa/103449
* ipa-param-manipulation.c
(ipa_param_body_adjustments::prepare_debug_expressions): Be
careful about hash_map reallocating itself.  Simpify a return
which always returns true.

Add comment to indicate tail recursion

My previous change removed an unreachable break; there (an
unreachable continue; would have been more to the point).  The
following re-adds a comment explaining that WALK_SUBEXPR_TAIL
does not fall through but tail recurses.

2021-11-30  Richard Biener  <rguenther@suse.de>

gcc/fortran/
* frontend-passes.c (gfc_expr_walker): Add comment to
indicate tail recursion.

Always track arguments, even when ignoring equiv params.

To "ignore" ranges from equivalences, we should track the range separately,
but still do the other name processing which determiens if there is a single
name or not for equivalence.  Otherwise we mistakently think we can introduce
an equivalences.

gcc/
PR tree-optimization/103440
* gimple-range-fold.cc (fold_using_range::range_of_phi): Continue
normal param processing for equiv params.

gcc/testsuite/
* gcc.dg/pr103440.c: New.

Remove more stray returns and gcc_unreachable ()s

This removes more cases that appear when bootstrap with
-Wunreachable-code-return progresses.

2021-11-29  Richard Biener  <rguenther@suse.de>

* config/i386/i386.c (ix86_shift_rotate_cost): Remove
unreachable return.
* tree-chrec.c (evolution_function_is_invariant_rec_p):
Likewise.
* tree-if-conv.c (if_convertible_stmt_p): Likewise.
* tree-ssa-pre.c (fully_constant_expression): Likewise.
* tree-vrp.c (operand_less_p): Likewise.
* reload.c (reg_overlap_mentioned_for_reload_p): Remove
unreachable gcc_unreachable ().
* sel-sched-ir.h (bb_next_bb): Likewise.
* varasm.c (compare_constant): Likewise.

gcc/cp/
* logic.cc (cnf_size_r): Remove unreachable and inconsistently
placed gcc_unreachable ()s.
* pt.c (iterative_hash_template_arg): Remove unreachable
gcc_unreachable and return.

gcc/fortran/
* target-memory.c (gfc_element_size): Remove unreachable return.

gcc/objc/
* objc-act.c (objc_build_setter_call): Remove unreachable
return.

libcpp/
* charset.c (convert_escape): Remove unreachable break.

tree-optimization/103489 - fix ICE when bool pattern recog fails

bool pattern recog currently does not handle cycles correctly
and when it fails we can ICE later vectorizing PHIs with
mismatched bool and non-bool vector types.  The following avoids
blindly trusting bool pattern recog here and verifies things
more thoroughly in vectorizable_phi.  A bool pattern recog fix
is for GCC 13.

2021-11-30  Richard Biener  <rguenther@suse.de>

PR tree-optimization/103489
* tree-vect-loop.c (vectorizable_phi): Verify argument
vector type compatibility to mitigate bool pattern recog
bug.

* gcc.dg/torture/pr103489.c: New testcase.

Change if-to-switch-conversion test.

PR tree-optimization/103278

gcc/testsuite/ChangeLog:

* gcc.dg/tree-ssa/if-to-switch-5.c: Make the test acceptable by
targets with no jump-tables.

libstdc++: Use gender-agnostic pronoun in docs

libstdc++-v3/ChangeLog:

* doc/xml/manual/debug_mode.xml: Replace "his or her" with "they".
* doc/html/manual/debug_mode_design.html: Regenerate.

libstdc++: Add [[nodiscard]] to std::byteswap

This patch adds [[nodiscard]] to std::byteswap, because the function
template doesn't do anything useful if the result isn't used.

2021-11-30  Jakub Jelinek  <jakub@redhat.com>

* include/std/bit (byteswap): Add [[nodiscard]].

[OpenACC] Remove erroneous "Orphan reductions cannot have gang partitioning" handling

That is:

    -/* Ensure that the middle end does not assign gang level parallelism
    -   to orphan loop containing reductions.  */
    +/* Verify that we diagnose "gang reduction on an orphan loop" for automatically
    +   assigned gang level of parallelism.  */

... to implement what the OpenACC specification actually says.

Fix-up for preceding commit 2b7dac2c0dcb087da9e4018943c023c0678234a3
"Make OpenACC orphan gang reductions errors".

gcc/
* omp-offload.c (oacc_loop_auto_partitions): Remove erroneous
"Orphan reductions cannot have gang partitioning" handling.
gcc/testsuite/
* c-c++-common/goacc/nested-reductions-1-routine.c: Adjust.
* c-c++-common/goacc/nested-reductions-2-routine.c: Adjust.
* c-c++-common/goacc/orphan-reductions-2.c: Adjust.
* gfortran.dg/goacc/nested-reductions-1-routine.f90: Adjust.
* gfortran.dg/goacc/nested-reductions-2-routine.f90: Adjust.
* gfortran.dg/goacc/orphan-reductions-1.f90: Adjust.
* gfortran.dg/goacc/orphan-reductions-2.f90: Adjust.

Consolidate OpenACC "gang reduction on an orphan loop" checking

No need to implement separately in all front ends what we may implement in the
middle end, once for all.

Follow-up to preceding commit 2b7dac2c0dcb087da9e4018943c023c0678234a3
"Make OpenACC orphan gang reductions errors".

gcc/
* omp-offload.c (oacc_loop_process): Implement "gang reduction on
an orphan loop" checking.
gcc/c/
* c-typeck.c (c_finish_omp_clauses): Remove "gang reduction on an
orphan loop" checking.
gcc/cp/
* semantics.c (finish_omp_clauses): Remove "gang reduction on an
orphan loop" checking.
gcc/fortran/
* openmp.c (resolve_oacc_loop_blocks): Remove "gang reduction on
an orphan loop" checking.
(oacc_is_parallel, oacc_is_kernels, oacc_is_serial)
(oacc_is_compute_construct): Remove.
gcc/testsuite/
* gfortran.dg/goacc/orphan-reductions-1.f90: Adjust.

Re OpenACC "gang reduction on an orphan loop" error message

Follow-up to preceding commit 2b7dac2c0dcb087da9e4018943c023c0678234a3
"Make OpenACC orphan gang reductions errors".

gcc/fortran/
* openmp.c (oacc_is_parallel_or_serial): Evolve into...
(oacc_is_compute_construct): ... this function.
(resolve_oacc_loop_blocks): Use "oacc_is_compute_construct"
instead of "oacc_is_parallel_or_serial" for checking that a
loop is not orphaned.
gcc/testsuite/
* gfortran.dg/goacc/orphan-reductions-3.f90: New test
verifying that the "gang reduction on an orphan loop" error message
is not emitted for non-orphaned loops.
* c-c++-common/goacc/orphan-reductions-3.c: Likewise for C and C++.

Co-Authored-By: Thomas Schwinge <thomas@codesourcery.com>

[OpenACC] Allow gang reductions inside serial constructs

... fixing a regression introduced in the preceding
commit 2b7dac2c0dcb087da9e4018943c023c0678234a3
"Make OpenACC orphan gang reductions errors".

gcc/fortran/
* openmp.c (oacc_is_serial, oacc_is_parallel_or_serial): New.
(resolve_oacc_loop_blocks): Use oacc_is_parallel_or_serial instead of
oacc_is_parallel.
libgomp/
* testsuite/libgomp.oacc-fortran/parallel-dims.f90: Remove
temporary skip.

Co-Authored-By: Thomas Schwinge <thomas@codesourcery.com>

Make OpenACC orphan gang reductions errors

This patch promotes all OpenACC gang reductions on orphan loops as
errors. Accord to the spec, orphan loops are those which are not
lexically nested inside an OpenACC parallel or kernels regions. I.e.,
acc loops inside acc routines.

At first I thought this could be a warning because the gang reduction
finalizer uses an atomic update. However, because there is no
synchronization between gangs, there is way to guarantee that reduction
will have completed once a single gang entity returns from the acc
routine call.

gcc/c/
* c-typeck.c (c_finish_omp_clauses): Emit an error on orphan
OpenACC gang reductions.
gcc/cp/
* semantics.c (finish_omp_clauses): Emit an error on orphan
OpenACC gang reductions.
gcc/fortran/
* openmp.c (oacc_is_parallel, oacc_is_kernels): New 'static'
functions.
(resolve_oacc_loop_blocks): Emit an error on orphan OpenACC gang
reductions.
gcc/
* omp-general.h (enum oacc_loop_flags): Add OLF_REDUCTION enum.
* omp-low.c (lower_oacc_head_mark): Use it to mark OpenACC
reductions.
* omp-offload.c (oacc_loop_auto_partitions): Don't assign gang
level parallelism to orphan reductions.
gcc/testsuite/
* c-c++-common/goacc/nested-reductions-1-routine.c: Adjust.
* c-c++-common/goacc/nested-reductions-2-routine.c: Likewise.
* gcc.dg/goacc/loop-processing-1.c: Likewise.
* gfortran.dg/goacc/nested-reductions-1-routine.f90: Likewise.
* gfortran.dg/goacc/nested-reductions-2-routine.f90: Likewise.
* c-c++-common/goacc/orphan-reductions-1.c: New test.
* c-c++-common/goacc/orphan-reductions-2.c: New test.
* gfortran.dg/goacc/orphan-reductions-1.f90: New test.
* gfortran.dg/goacc/orphan-reductions-2.f90: New test.
libgomp/
* testsuite/libgomp.oacc-fortran/parallel-dims.f90: Temporarily
skip.

Co-Authored-By: Thomas Schwinge <thomas@codesourcery.com>

Fix c-c++-common/goacc/routine-4.c and c-c++-common/goacc/routine-4-extern.c testcases

... in preparation for checks that we're introducing for OpenACC gang
reductions on orphan loops.

gcc/testsuite/
* c-c++-common/goacc/routine-4.c (seq, vector, worker, gang):
Remove loop reductions.
* c-c++-common/goacc/routine-4-extern.c (seq, vector, worker, gang):
Likewise.

Co-Authored-By: Thomas Schwinge <thomas@codesourcery.com>

[Committed] PR testsuite/103477: Fix big-endian mistake in new test case.

I missed a spot when adding the "#if __BYTE_ORDER__ == ..." guards to
the new test case for PR tree-optimization/103345.  Committed as obvious.

2021-11-30  Roger Sayle  <roger@nextmovesoftware.com>

gcc/testsuite/ChangeLog
PR testsuite/103477
* gcc.dg/tree-ssa/pr103345.c: Correct xor test for big-endian.

Remove can_throw_non_call_exceptions special case from operator_div::wi_fold.

PR tree-optimization/103451

gcc/ChangeLog:

* range-op.cc (operator_div::wi_fold): Remove
can_throw_non_call_exceptions special case.
* tree-ssa-sink.c (sink_code_in_bb): Same.

gcc/testsuite/ChangeLog:

* gcc.dg/pr103451.c: New test.

vect: Support masked gather loads with SLP

This patch extends the previous SLP gather load support so
that it can handle masked loads too.

gcc/
* tree-vect-slp.c (arg1_arg4_map): New variable.
(vect_get_operand_map): Handle IFN_MASK_GATHER_LOAD.
(vect_build_slp_tree_1): Likewise.
(vect_build_slp_tree_2): Likewise.
* tree-vect-stmts.c (vectorizable_load): Expect the mask to be
the last SLP child node rather than the first.

gcc/testsuite/
* gcc.dg/vect/vect-gather-3.c: New test.
* gcc.dg/vect/vect-gather-4.c: Likewise.
* gcc.target/aarch64/sve/mask_gather_load_8.c: Likewise.

if-conv: Apply VN to hoisted conversions

This patch is a prerequisite for a later one.  At the moment,
if-conversion converts predicated POINTER_PLUS_EXPRs into
non-wrapping forms, which for:

    … = base + offset

becomes:

    tmp = (unsigned long) base
    … = tmp + offset

It then hoists these conversions out of the loop where possible.

However, because “base” is a valid gimple operand, there can be
multiple POINTER_PLUS_EXPRs with the same base, which can in turn
lead to multiple instances of the same conversion.  The later VN pass
is (and I think needs to be) restricted to the new if-converted code,
whereas here we're deliberately inserting the conversions before the
.LOOP_VECTORIZED condition:

/* If we versioned loop then make sure to insert invariant
   stmts before the .LOOP_VECTORIZED check since the vectorizer
   will re-use that for things like runtime alias versioning
   whose condition can end up using those invariants.  */

We can therefore enter the vectoriser with redundant conversions.

The easiest fix seemed to be to defer the hoisting until after VN.
This catches other hoisting opportunities too.

Hoisting the code from the (artificial) loop in pr99102.c means
that it's no longer worth vectorising.  The patch forces vectorisation
instead of relying on the cost model.

The patch also reverts pr87007-4.c and pr87007-5.c back to their
original forms, undoing changes in 783dc66f9ccb0019c3dad.
The code at the time the tests were added was:

        testl   %edi, %edi
        je      .L10
        vxorps  %xmm1, %xmm1, %xmm1
        vsqrtsd d3(%rip), %xmm1, %xmm0
        vsqrtsd d2(%rip), %xmm1, %xmm1
...
.L10:
        ret

with the operations being hoisted, and the vxorps was specifically
wanted (compared to the previous code).  This patch restores the code
to that form, with the hoisted operations and the vxorps.

gcc/
* tree-if-conv.c: Include tree-eh.h.
(predicate_statements): Remove pe argument.  Don't hoist
statements here.
(combine_blocks): Remove pe argument.
(ifcvt_available_on_edge_p, ifcvt_can_hoist): New functions.
(ifcvt_hoist_invariants): Likewise.
(tree_if_conversion): Update call to combine_blocks.  Call
ifcvt_hoist_invariants after VN.

gcc/testsuite/
* gcc.dg/vect/pr99102.c: Add -fno-vect-cost-model.

Revert:
2020-09-09  Richard Biener  [rguenther@suse.de]

* gcc.target/i386/pr87007-4.c: Adjust.
* gcc.target/i386/pr87007-5.c: Likewise.

vect: Support gather loads with SLP

This patch adds SLP support for IFN_GATHER_LOAD.  Like the SLP
support for IFN_MASK_LOAD, it works by treating only some of the
arguments as child nodes.  Unlike IFN_MASK_LOAD, it requires the
other arguments (base, scale, and extension type) to be the same
for all calls in the group.  It does not require/expect the loads
to be in a group (which probably wouldn't make sense for gathers).

I was worried about the possible alias effect of moving gathers
around to be part of the same SLP group.  The patch therefore
makes vect_analyze_data_ref_dependence treat gathers and scatters
as a top-level concern, punting if the accesses aren't completely
independent and if the user hasn't told us that a particular
VF is safe.  I think in practice we already punted in the same
circumstances; the idea is just to make it more explicit.

gcc/
PR tree-optimization/102467
* doc/sourcebuild.texi (vect_gather_load_ifn): Document.
* tree-vect-data-refs.c (vect_analyze_data_ref_dependence):
Commonize safelen handling.  Punt for anything involving
gathers and scatters unless safelen says otherwise.
* tree-vect-slp.c (arg1_map): New variable.
(vect_get_operand_map): Handle IFN_GATHER_LOAD.
(vect_build_slp_tree_1): Likewise.
(vect_build_slp_tree_2): Likewise.
(compatible_calls_p): If vect_get_operand_map returns nonnull,
check that any skipped arguments are equal.
(vect_slp_analyze_node_operations_1): Tighten reduction check.
* tree-vect-stmts.c (check_load_store_for_partial_vectors): Take
an ncopies argument.
(vect_get_gather_scatter_ops): Take slp_node and ncopies arguments.
Handle SLP nodes.
(vectorizable_store, vectorizable_load): Adjust accordingly.

gcc/testsuite/
* lib/target-supports.exp
(check_effective_target_vect_gather_load_ifn): New target test.
* gcc.dg/vect/vect-gather-1.c: New test.
* gcc.dg/vect/vect-gather-2.c: Likewise.
* gcc.target/aarch64/sve/gather_load_11.c: Likewise.