Enhance vec_pack_trunc for integral mode mask.

For testcase in PR, the patch supports QI:4 -> HI:16 pack with
multi steps(first pack QI:4 -> QI:8 through vec_pack_sbool_trunc_qi,
then pack QI:8 -> HI:16 through vec_pack_trunc_hi).
Similar for QI:2 -> HI:16 which is test4 in mask-pack-prefer-128.c.

gcc/ChangeLog:

PR target/103771
* tree-vect-stmts.cc (supportable_narrowing_operation): Enhance
integral mode mask pack by multi steps which takes
vec_pack_sbool_trunc_optab as start when elements number is
less than BITS_PER_UNITS.

gcc/testsuite/ChangeLog:

* gcc.target/i386/mask-pack-prefer128.c: New test.
* gcc.target/i386/mask-pack-prefer256.c: New test.
* gcc.target/i386/pr103771.c: New test.

tree-optimization/104114 - avoid diagnosing V1mode lowering

Currently we diagnose vector lowering of V1mode operations that
are not natively supported into V_C_E, scalar op plus CTOR with
-Wvector-operation-performance but that's hardly useful behavior
even though the way we lower things can be improved.

The following disables the diagnostics for the cases the vect.exp
testsuite runs into, on x86 that are vect-cond-11.c and
vect-singleton_1.c.

2022-01-19  Richard Biener  <rguenther@suse.de>

PR tree-optimization/104114
* tree-vect-generic.cc (expand_vector_piecewise): Do not diagnose
single element vector decomposition.

c++: template-id with current inst qualifier [PR102300]

The patch for PR41723 properly changed one place to look into the current
instantiation; now we need to fix this place as well.

PR c++/102300

gcc/cp/ChangeLog:

* parser.cc (cp_parser_template_name): Use dependent_scope_p.

gcc/testsuite/ChangeLog:

* g++.dg/parse/no-typename1.C: Remove expected error.
* g++.dg/template/nested7.C: New test.

testsuite: sldoi requires VSX.

gcc/testsuite/ChangeLog:

* gcc.target/powerpc/sldoi_to_mov.c: Require VSX.

Daily bump.

libstdc++: Remove -gdwarf-4 from flags for debug library

The default is -gdwarf-5 now, so this is hurting rather than improving
things.

libstdc++-v3/ChangeLog:

* configure.ac (GLIBCXX_ENABLE_DEBUG_FLAGS): Remove -gdwarf-4
from default flags.
* configure: Regenerate.

libstdc++: Include <stddef.h> for size_t and ptrdiff_t [PR104123]

libstdc++-v3/ChangeLog:

PR libstdc++/104123
* testsuite/29_atomics/headers/stdatomic.h/c_compat.cc: Include
<stddef.h>.

ifcvt: Run second pass if it is possible to omit a temporary.

If one of the to-be-converted SETs requires the original comparison
(i.e. in order to generate a min/max insn) but no other insn after it
does, we can omit creating temporaries, thus facilitating costing.

gcc/ChangeLog:

* ifcvt.cc (noce_convert_multiple_sets_1): New function.
(noce_convert_multiple_sets): Call function a second time if we can
improve the first try.

testsuite/s390: Add tests for noce_convert_multiple.

Add new s390-specific tests that check if we convert two SETs into two
loads on condition.  Remove the s390-specific target-check in
gcc.dg/ifcvt-4.c.

gcc/testsuite/ChangeLog:

* gcc.dg/ifcvt-4.c: Remove s390-specific check.
* gcc.target/s390/ifcvt-two-insns-bool.c: New test.
* gcc.target/s390/ifcvt-two-insns-int.c: New test.
* gcc.target/s390/ifcvt-two-insns-long.c: New test.

ifcvt: Try re-using CC for conditional moves.

Following up on the previous patch, this patch makes
noce_convert_multiple emit two cmov sequences:  The same one as before
and a second one that tries to re-use the existing CC.  Then their costs
are compared and the cheaper one is selected.

gcc/ChangeLog:

* ifcvt.cc (cond_exec_get_condition): New parameter to allow getting the
reversed comparison.
(try_emit_cmove_seq): New function to facilitate creating a cmov
sequence.
(noce_convert_multiple_sets): Create two sequences and use the less
expensive one.

ifcvt/optabs: Allow using a CC comparison for emit_conditional_move.

Currently we only ever call emit_conditional_move with the comparison
(as well as its comparands) we got from the jump.  Thus, backends are
going to emit a CC comparison for every conditional move that is being
generated instead of re-using the existing CC.
This, combined with emitting temporaries for each conditional move,
causes sky-high costs for conditional moves.

This patch allows to re-use a CC so the costing situation is improved a
bit.

gcc/ChangeLog:

* rtl.h (struct rtx_comparison): New struct that holds an rtx
comparison.
* config/rs6000/rs6000.cc (rs6000_emit_minmax): Use struct instead of
single parameters.
(rs6000_emit_swsqrt): Likewise.
* expmed.cc (expand_sdiv_pow2): Likewise.
(emit_store_flag): Likewise.
* expr.cc (expand_cond_expr_using_cmove): Likewise.
(expand_expr_real_2): Likewise.
* ifcvt.cc (noce_emit_cmove): Add compare and reversed compare
parameters.
* optabs.cc (emit_conditional_move_1): New function.
(expand_doubleword_shift_condmove): Use struct.
(emit_conditional_move): Use struct and allow to call directly
without going through preparation steps.
* optabs.h (emit_conditional_move): Use struct.

ifcvt: Improve costs handling for noce_convert_multiple.

When noce_convert_multiple is called the original costs are not yet
initialized.  Therefore, up to now, costs were only ever unfairly
compared against COSTS_N_INSNS (2).  This would lead to
default_noce_conversion_profitable_p () rejecting all but the most
contrived of sequences.

This patch temporarily initializes the original costs by counting
adding costs for all sets inside the then_bb.

gcc/ChangeLog:

* ifcvt.cc (bb_ok_for_noce_convert_multiple_sets): Estimate insns costs.
(noce_process_if_block): Use potential costs.

ifcvt: Allow constants for noce_convert_multiple.

This lifts the restriction of not allowing constants for
noce_convert_multiple.  The code later checks if a valid sequence
is produced anyway.

gcc/ChangeLog:

* ifcvt.cc (noce_convert_multiple_sets): Allow constants.
(bb_ok_for_noce_convert_multiple_sets): Likewise.

ifcvt: Check if cmovs are needed.

When if-converting multiple SETs and we encounter a swap-style idiom

  if (a > b)
    {
      tmp = c;   // [1]
      c = d;
      d = tmp;
    }

ifcvt should not generate a conditional move for the instruction at
[1].

In order to achieve that, this patch goes through all relevant SETs
and marks the relevant instructions.  This helps to evaluate costs.

On top, only generate temporaries if the current cmov is going to
overwrite one of the comparands of the initial compare.

gcc/ChangeLog:

* ifcvt.cc (need_cmov_or_rewire): New function.
(noce_convert_multiple_sets): Call it.

Update per-file selftest and finalization hooks for .c to .cc renaming

This is mostly a mechanical change, apart from:
- fix the name of attribute_c_tests to match its filename (attribs.cc)
- fix the name of opt_proposer_c to match its filename (opt-suggestions.cc)
- delete a bogus "modref_c_tests" decl from ipa-modref-tree.h that's been
  present since the initial commit of that file
  (d119f34c952f8718fdbabc63e2f369a16e92fa07)

gcc/ChangeLog:
* attribs.cc (attribute_c_tests): Rename to...
(attribs_cc_tests): ...this.
* bitmap.cc (bitmap_c_tests): Rename to...
(bitmap_cc_tests): ...this.
* cgraph.cc (cgraph_c_finalize): Rename to...
(cgraph_cc_finalize): ...this.
(cgraph_c_tests): Rename to...
(cgraph_cc_tests): ...this.
* cgraph.h (cgraph_c_finalize): Rename to...
(cgraph_cc_finalize): ...this.
(cgraphunit_c_finalize): Rename to...
(cgraphunit_cc_finalize): ...this.
* cgraphunit.cc (cgraphunit_c_finalize): Rename to...
(cgraphunit_cc_finalize): ...this.
* convert.cc (convert_c_tests): Rename to...
(convert_cc_tests): ...this.
* dbgcnt.cc (dbgcnt_c_tests): Rename to...
(dbgcnt_cc_tests): ...this.
* diagnostic-show-locus.cc (diagnostic_show_locus_c_tests): Rename to...
(diagnostic_show_locus_cc_tests): ...this.
* diagnostic.cc (diagnostic_c_tests): Rename to...
(diagnostic_cc_tests): ...this.
* dumpfile.cc (dumpfile_c_tests): Rename to...
(dumpfile_cc_tests): ...this.
* dwarf2out.cc (dwarf2out_c_finalize): Rename to...
(dwarf2out_cc_finalize): ...this.
* dwarf2out.h (dwarf2out_c_finalize): Rename to...
(dwarf2out_cc_finalize): ...this.
* edit-context.cc (edit_context_c_tests): Rename to...
(edit_context_cc_tests): ...this.
* et-forest.cc (et_forest_c_tests): Rename to...
(et_forest_cc_tests): ...this.
* fibonacci_heap.cc (fibonacci_heap_c_tests): Rename to...
(fibonacci_heap_cc_tests): ...this.
* fold-const.cc (fold_const_c_tests): Rename to...
(fold_const_cc_tests): ...this.
* function-tests.cc (function_tests_c_tests): Rename to...
(function_tests_cc_tests): ...this.
* gcse.cc (gcse_c_finalize): Rename to...
(gcse_cc_finalize): ...this.
* gcse.h (gcse_c_finalize): Rename to...
(gcse_cc_finalize): ...this.
* ggc-tests.cc (ggc_tests_c_tests): Rename to...
(ggc_tests_cc_tests): ...this.
* gimple-ssa-store-merging.cc (store_merging_c_tests): Rename to...
(store_merging_cc_tests): ...this.
* gimple.cc (gimple_c_tests): Rename to...
(gimple_cc_tests): ...this.
* hash-map-tests.cc (hash_map_tests_c_tests): Rename to...
(hash_map_tests_cc_tests): ...this.
* hash-set-tests.cc (hash_set_tests_c_tests): Rename to...
(hash_set_tests_cc_tests): ...this.
* input.cc (input_c_tests): Rename to...
(input_cc_tests): ...this.
* ipa-cp.cc (ipa_cp_c_finalize): Rename to...
(ipa_cp_cc_finalize): ...this.
* ipa-fnsummary.cc (ipa_fnsummary_c_finalize): Rename to...
(ipa_fnsummary_cc_finalize): ...this.
* ipa-fnsummary.h (ipa_fnsummary_c_finalize): Rename to...
(ipa_fnsummary_cc_finalize): ...this.
* ipa-modref-tree.cc (ipa_modref_tree_c_tests): Rename to...
(ipa_modref_tree_cc_tests): ...this.
* ipa-modref-tree.h (modref_c_tests): Delete bogus decl.
* ipa-modref.cc (ipa_modref_c_finalize): Rename to...
(ipa_modref_cc_finalize): ...this.
* ipa-modref.h (ipa_modref_c_finalize): Rename to...
(ipa_modref_cc_finalize): ...this.
* ipa-prop.h (ipa_cp_c_finalize): Rename to...
(ipa_cp_cc_finalize): ...this.
* ipa-reference.cc (ipa_reference_c_finalize): Rename to...
(ipa_reference_cc_finalize): ...this.
* ipa-reference.h (ipa_reference_c_finalize): Rename to...
(ipa_reference_cc_finalize): ...this.
* ira-costs.cc (ira_costs_c_finalize): Rename to...
(ira_costs_cc_finalize): ...this.
* ira.h (ira_costs_c_finalize): Rename to...
(ira_costs_cc_finalize): ...this.
* opt-suggestions.cc (opt_proposer_c_tests): Rename to...
(opt_suggestions_cc_tests): ...this.
* opts.cc (opts_c_tests): Rename to...
(opts_cc_tests): ...this.
* predict.cc (predict_c_tests): Rename to...
(predict_cc_tests): ...this.
* pretty-print.cc (pretty_print_c_tests): Rename to...
(pretty_print_cc_tests): ...this.
* read-rtl-function.cc (read_rtl_function_c_tests): Rename to...
(read_rtl_function_cc_tests): ...this.
* rtl-tests.cc (rtl_tests_c_tests): Rename to...
(rtl_tests_cc_tests): ...this.
* sbitmap.cc (sbitmap_c_tests): Rename to...
(sbitmap_cc_tests): ...this.
* selftest-run-tests.cc (selftest::run_tests): Update calls for
_c_ to _cc_ function renamings; fix names of attribs and
opt-suggestions tests.
* selftest.cc (selftest_c_tests): Rename to...
(selftest_cc_tests): ...this.
* selftest.h (attribute_c_tests): Rename to...
(attribs_cc_tests): ...this.
(bitmap_c_tests): Rename to...
(bitmap_cc_tests): ...this.
(cgraph_c_tests): Rename to...
(cgraph_cc_tests): ...this.
(convert_c_tests): Rename to...
(convert_cc_tests): ...this.
(diagnostic_c_tests): Rename to...
(diagnostic_cc_tests): ...this.
(diagnostic_show_locus_c_tests): Rename to...
(diagnostic_show_locus_cc_tests): ...this.
(dumpfile_c_tests): Rename to...
(dumpfile_cc_tests): ...this.
(edit_context_c_tests): Rename to...
(edit_context_cc_tests): ...this.
(et_forest_c_tests): Rename to...
(et_forest_cc_tests): ...this.
(fibonacci_heap_c_tests): Rename to...
(fibonacci_heap_cc_tests): ...this.
(fold_const_c_tests): Rename to...
(fold_const_cc_tests): ...this.
(function_tests_c_tests): Rename to...
(function_tests_cc_tests): ...this.
(ggc_tests_c_tests): Rename to...
(ggc_tests_cc_tests): ...this.
(gimple_c_tests): Rename to...
(gimple_cc_tests): ...this.
(hash_map_tests_c_tests): Rename to...
(hash_map_tests_cc_tests): ...this.
(hash_set_tests_c_tests): Rename to...
(hash_set_tests_cc_tests): ...this.
(input_c_tests): Rename to...
(input_cc_tests): ...this.
(opts_c_tests): Rename to...
(opts_cc_tests): ...this.
(predict_c_tests): Rename to...
(predict_cc_tests): ...this.
(pretty_print_c_tests): Rename to...
(pretty_print_cc_tests): ...this.
(read_rtl_function_c_tests): Rename to...
(read_rtl_function_cc_tests): ...this.
(rtl_tests_c_tests): Rename to...
(rtl_tests_cc_tests): ...this.
(sbitmap_c_tests): Rename to...
(sbitmap_cc_tests): ...this.
(selftest_c_tests): Rename to...
(selftest_cc_tests): ...this.
(simplify_rtx_c_tests): Rename to...
(simplify_rtx_cc_tests): ...this.
(spellcheck_c_tests): Rename to...
(spellcheck_cc_tests): ...this.
(spellcheck_tree_c_tests): Rename to...
(spellcheck_tree_cc_tests): ...this.
(sreal_c_tests): Rename to...
(sreal_cc_tests): ...this.
(store_merging_c_tests): Rename to...
(store_merging_cc_tests): ...this.
(tree_c_tests): Rename to...
(tree_cc_tests): ...this.
(tree_cfg_c_tests): Rename to...
(tree_cfg_cc_tests): ...this.
(typed_splay_tree_c_tests): Rename to...
(typed_splay_tree_cc_tests): ...this.
(vec_c_tests): Rename to...
(vec_cc_tests): ...this.
(vec_perm_indices_c_tests): Rename to...
(vec_perm_indices_cc_tests): ..this.
(opt_proposer_c_tests): Rename to...
(opt_suggestions_cc_tests): ...this.
(dbgcnt_c_tests): Rename to...
(dbgcnt_cc_tests): ...this.
(ipa_modref_tree_c_tests): Rename to...
(ipa_modref_tree_cc_tests): ...this.
* simplify-rtx.cc (simplify_rtx_c_tests): Rename to...
(simplify_rtx_cc_tests): ...this.
* spellcheck-tree.cc (spellcheck_tree_c_tests): Rename to...
(spellcheck_tree_cc_tests): ...this.
* spellcheck.cc (spellcheck_c_tests): Rename to...
(spellcheck_cc_tests): ...this.
* sreal.cc (sreal_c_tests): Rename to...
(sreal_cc_tests): ...this.
* toplev.cc (toplev::finalize): Update calls for _c_ to _cc_
function renamings.
* tree-cfg.cc (tree_cfg_c_tests): Rename to...
(tree_cfg_cc_tests): ...this.
* tree.cc (tree_c_tests): Rename to...
(tree_cc_tests): ...this.
* typed-splay-tree.cc (typed_splay_tree_c_tests): Rename to...
(typed_splay_tree_cc_tests): ...this.
* vec-perm-indices.cc (vec_perm_indices_c_tests): Rename to...
(vec_perm_indices_cc_tests): ...this.
* vec.cc (vec_c_tests): Rename to...
(vec_cc_tests): ...this.

gcc/c-family/ChangeLog:
* c-common.cc (c_common_c_tests): Rename to...
(c_common_cc_tests): ...this.
(c_family_tests): Update calls for .c to .cc renaming.
* c-common.h (c_format_c_tests): Rename to...
(c_format_cc_tests): ...this.
(c_indentation_c_tests): Rename to...
(c_indentation_cc_tests): ...this.
(c_pretty_print_c_tests): Rename to...
(c_pretty_print_cc_tests): ...this.
* c-format.cc (c_format_c_tests): Rename to...
(c_format_cc_tests): ...this.
* c-indentation.cc (c_indentation_c_tests): Rename to...
(c_indentation_cc_tests): ...this.
* c-pretty-print.cc (c_pretty_print_c_tests): Rename to...
(c_pretty_print_cc_tests): ...this.

gcc/cp/ChangeLog:
* cp-lang.cc (selftest::run_cp_tests): Update calls for .c to .cc
renaming.
* cp-tree.h (cp_pt_c_tests): Rename to...
(cp_pt_cc_tests): ...this.
(cp_tree_c_tests): Rename to...
(cp_tree_cc_tests): ...this.
* pt.cc (cp_pt_c_tests): Rename to...
(cp_pt_cc_tests): ...this.
* tree.cc (cp_tree_c_tests): Rename to...
(cp_tree_cc_tests): ...this.

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

libstdc++: Fix libbacktrace build files

This makes it possible to combine --enable-libstdcxx-debug with
--enable-libstdcxx-backtrace, by adding a rule to src/Makefile to copy
the backtrace-supported.h header into the src/debug/libbacktrace
directory.

Add libbacktrace path to testsuite flags so the tests can link without
having the library installed.

Also fix some warnings when running automake for the libbacktrace
makefile.

Use a per-library CPPFLAGS variable to fix:

src/libbacktrace/Makefile.am:38: warning: AM_CPPFLAGS multiply defined in condition TRUE ...
fragment.am:43: ... 'AM_CPPFLAGS' previously defined here
src/libbacktrace/Makefile.am:32:   'fragment.am' included from here

Create symlinks to the libbacktrace sources to fix:

src/libbacktrace/Makefile.am:55: warning: source file '../../../libbacktrace/atomic.c' is in a subdirectory,
src/libbacktrace/Makefile.am:55: but option 'subdir-objects' is disabled

libstdc++-v3/ChangeLog:

* scripts/testsuite_flags.in: Add src/libbacktrace/.libs to
linker search paths.
* src/Makefile.am: Fix src/debug/libbacktrace build.
* src/Makefile.in: Regenerate.
* src/libbacktrace/Makefile.am: Use per-library CPPFLAGS
variable. Use symlinks for the source files.
* src/libbacktrace/Makefile.in: Regenerate.

vect: Fix epilogue mode skipping

gcc/ChangeLog:

PR tree-optimization/103997
* tree-vect-loop.cc (vect_analyze_loop): Fix mode skipping for epilogue
vectorization.

match.pd, optabs: Avoid vectorization of {FLOOR,CEIL,ROUND}_{DIV,MOD}_EXPR [PR102860]

power10 has modv4si3 expander and so vectorizes the following testcase
where Fortran modulo is FLOOR_MOD_EXPR.
optabs_for_tree_code indicates that the optab for all the *_MOD_EXPR
variants is umod_optab or smod_optab, but that isn't true, that optab
actually expands just TRUNC_MOD_EXPR.  For the other tree codes expmed.cc
has code how to adjust the TRUNC_MOD_EXPR into those by emitting some
extra comparisons and conditional updates.  Similarly for *_DIV_EXPR,
except in that case it actually needs both division and modulo.

While it would be possible to handle it in expmed.cc for vectors as well,
we'd need to be sure all the vector operations we need for that are
available, and furthermore we wouldn't account for that in the costing.

So, IMHO it is better to stop pretending those non-truncating (and
non-exact) div/mod operations have an optab.  For GCC 13, we should
IMHO pattern match these in tree-vect-patterns.cc and transform them
to truncating div/mod with follow-up adjustments and let the vectorizer
vectorize that.  As written in the PR, for signed operands:
r = x %[fl] y;
is
r = x % y; if (r && (x ^ y) < 0) r += y;
and
d = x /[fl] y;
is
r = x % y; d = x / y; if (r && (x ^ y) < 0) --d;
and
r = x %[cl] y;
is
r = x % y; if (r && (x ^ y) >= 0) r -= y;
and
d = /[cl] y;
is
r = x % y; d = x / y; if (r && (x ^ y) >= 0) ++d;
(too lazy to figure out rounding div/mod now).  I'll create a PR
for that.
The patch also extends a match.pd optimization that floor_mod on
unsigned operands is actually trunc_mod.

2022-01-19  Jakub Jelinek  <jakub@redhat.com>

PR middle-end/102860
* match.pd (x %[fl] y -> x % y): New simplification for
unsigned integral types.
* optabs-tree.cc (optab_for_tree_code): Return unknown_optab
for {CEIL,FLOOR,ROUND}_{DIV,MOD}_EXPR with VECTOR_TYPE.

* gfortran.dg/pr102860.f90: New test.

testsuite: Test evrp-trans.c also with unsigned types [PR104115]

The testcase from the PR got fixed with r12-3119-g675a3e40567e1d
and looks quite similar to the evrp-trans.c test, except evrp-trans.c
is tested on signed integer types.
I think it would be useful to test it for unsigned comparisons too.

2022-01-19  Jakub Jelinek  <jakub@redhat.com>

PR c/104115
* gcc.dg/tree-ssa/evrp-trans2.c: New test.

tree-optimization/104112 - add check for vect epilogue reduc reuse

This adds a missing check for the availability of intermediate vector
types required to re-use the accumulator of a vectorized reduction
in the vectorized epilogue.  For SVE and VNx2DF vs V2DF with
-msve-vector-bits=512 for example V4DF is not available.

In addition to that we have to verify the reduction operation is
supported, otherwise we for example on i?86 get vector code that's
later decomposed again by vector lowering when trying to use
a V2HI epilogue for a V8HI reduction with a target without
TARGET_MMX_WITH_SSE.

It might be we want -Wvector-operation-performance for all vect.exp
tests but that seems to have existing regressions.

2022-01-19  Richard Biener  <rguenther@suse.de>

PR tree-optimization/104112
* tree-vect-loop.cc (vect_find_reusable_accumulator): Check
for required intermediate vector types.

* gcc.dg/vect/pr104112-1.c: New testcase.
* gcc.dg/vect/pr104112-2.c: New testcase.

check_GNU_style_lib: skip .py files (one should use flake8).

contrib/ChangeLog:

* check_GNU_style_lib.py: Skip Python files.

libgomp, OpenMP: Fix issue for omp_get_device_num on gcn targets.

Currently omp_get_device_num does not work on gcn targets with more than one
offload device. The reason is that GOMP_DEVICE_NUM_VAR is static in
icv-device.c and thus "__gomp_device_num" is not visible in the offload image.

This patch removes "static" such that "__gomp_device_num" is now part of the
offload image and can now be found in GOMP_OFFLOAD_load_image in the plugin.

This is not an issue for nvptx. There, "__gomp_device_num" is in the offload
image even with "static".

libgomp/ChangeLog:

* config/gcn/icv-device.c: Make GOMP_DEVICE_NUM_VAR public (remove
"static") to make the device num available in the offload image.

libstdc++: Fix for non-constexpr math_errhandling

Use SFINAE magic to support: "It is unspecified whether math_errhandling
is a macro or an identifier with external linkage." [C Standard]

Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
libstdc++-v3/ChangeLog:

* include/experimental/bits/simd.h (__floating_point_flags): Do
not rely on math_errhandling to expand to a constant expression.

[Ada] Set target_cpu to x32 for x86_64-linux-gnux32

Since the x86_64-linux-gnux32 compiler is actually an x32 compiler, set
target_cpu to x32 for x86_64-linux-gnux32.

PR ada/103538
* gcc-interface/Makefile.in (target_cpu): Set to x32 for
x86_64-linux-gnux32.

[Ada] Compile s-mmap and 128bit on x86_64-linux-gnux32

PR ada/103538
* Makefile.rtl (LIBGNAT_TARGET_PAIRS): Add
$(TRASYM_DWARF_UNIX_PAIRS),
s-tsmona.adb<libgnat/s-tsmona__linux.adb,
$(GNATRTL_128BIT_PAIRS).
(EXTRA_GNATRTL_NONTASKING_OBJS): Add $(TRASYM_DWARF_UNIX_OBJS)
and $(GNATRTL_128BIT_OBJS).

testsuite: Rename a few C++ to .C or .cc.

The tests are C++ code, so use a proper file extension.

gcc/testsuite/ChangeLog:

* g++.dg/ext/boolcomplex-1.c: Moved to...
* g++.dg/ext/boolcomplex-1.C: ...here.
* g++.dg/opt/pr47639.c: Moved to...
* g++.dg/opt/pr47639.C: ...here.
* g++.dg/pr83979.c: Moved to...
* g++.dg/pr83979.C: ...here.
* g++.dg/tm/asm-1.c: Moved to...
* g++.dg/tm/asm-1.C: ...here.
* g++.dg/vect/pr71483.c: Moved to...
* g++.dg/vect/pr71483.cc: ...here.

rs6000: Fix bootstrap

> On 18/01/2022 22:42, Segher Boessenkool wrote:
> > > +    default:
> > > +      break;
> > Please don't do that.  You can do
> >
> >    default:
> >      break;
> >      break;
> >      /* And just to make sure:  */
> >      break;
> >      break;
> >
> > and it will do exactly the same as not having a default at all.  Not
> > having such useless code is by far the most readable, so please don't
> > include a default case at all.
>
> I removed the default case. I hope this is what you wanted.

Unfortunately the removal of default: break; breaks bootstrap:
../../gcc/config/rs6000/rs6000.cc: In function ‘const char* rs6000_machine_from_flags()’:
../../gcc/config/rs6000/rs6000.cc:5940:10: error: enumeration value ‘PROCESSOR_PPC601’ not handled in switch [-Werror=switch]
 5940 |   switch (rs6000_cpu)
      |          ^
../../gcc/config/rs6000/rs6000.cc:5940:10: error: enumeration value ‘PROCESSOR_PPC603’ not handled in switch [-Werror=switch]
...
default: break; is needed to tell the -Wswitch warning that it is intentional
that not all enumerators are handled in the switch.

2022-01-19  Jakub Jelinek  <jakub@redhat.com>

* config/rs6000/rs6000.cc (rs6000_machine_from_flags): Add default:.

Enable -Werror=format-diag during bootstrap.

gcc/ChangeLog:

* configure.ac: Remove -Wno-error=format-diag.
* configure: Regenerate.

Update on riscv -Wformat-diag string.

gcc/ChangeLog:

* config/riscv/riscv.cc (riscv_handle_type_attribute):
Update one -Wformat-diag string in warning message.

gimple-ssa-warn-access: Fix up asan_test.C -Wdangling-pointer regression [PR104103]

As reported in the PR or as I've seen since the weekend, asan_test.C fails
because of many warnings like:
gcc/testsuite/g++.dg/asan/asan_test.cc:1157:10: error: using a dangling pointer to an unnamed temporary [-Werror=dangling-pointer=]
gcc/testsuite/g++.dg/asan/asan_test.cc:1157:10: error: using a dangling pointer to an unnamed temporary [-Werror=dangling-pointer=]
gcc/testsuite/g++.dg/asan/asan_test.cc:1162:27: error: using a dangling pointer to an unnamed temporary [-Werror=dangling-pointer=]
...
(lots of them).
There are no dangling pointers though, the warning pass sees:
  some_automatic_var ={v} {CLOBBER};
  .ASAN_MARK (POISON, &some_automatic_var, 8);
and warns on that (both on user vars and on e.g. TARGET_EXPR temporaries).
There is nothing wrong on that, .ASAN_MARK is compiler instrumentation,
which doesn't even touch the variable in any way nor make it escaped.
What it instead does is change bytes in the shadow memory corresponding
to the variable to reflect that the variable is out of scope and make
sure that access to it would be diagnosed at runtime.
So, for all purposes of the -Wdangling-pointer and -Wuse-after-free
warnings, we should ignore this internal call.

2022-01-19  Jakub Jelinek  <jakub@redhat.com>

PR middle-end/104103
* gimple-ssa-warn-access.cc (pass_waccess::check_call): Don't check
.ASAN_MARK calls.

fold-const: Optimize &"foo"[0] == "foo" [PR89074]

This is a non-C++ related part from the PR89074 address_compare changes.
For "foo" == "foo" we already optimize this from the (cmp @0 @0)
simplification, because we use operand_equal_p in that case
and operand_equal_p also compares the STRING_CSTs bytes rather than
just addresses.

2022-01-19  Jakub Jelinek  <jakub@redhat.com>

PR c++/89074
* fold-const.cc (address_compare): Consider different STRING_CSTs
with the same lengths that memcmp the same as equal, not different.

* gcc.dg/tree-ssa/pr89074.c: New test.

i386: Fix *aes<aeswideklvariant>u8

grep '{[^|}]*}"' *.md

found another spot, though dunno if we have sufficient effective targets
etc. to add an -masm=intel test for it (and my installed binutils doesn't
support it anyway).
Binutils trunk testsuite shows the argument isn't omitted even in the Intel
syntax:
grep aesencwide *.s
keylocker.s:    aesencwide128kl 126(%edx)
keylocker.s:    aesencwide256kl 126(%edx)
keylocker.s:    aesencwide128kl [edx+126]
keylocker.s:    aesencwide256kl [edx+126]
property-10.s:   aesencwide128kl (%eax)
x86-64-keylocker.s:     aesencwide128kl 126(%rdx)
x86-64-keylocker.s:     aesencwide256kl 126(%rdx)
x86-64-keylocker.s:     aesencwide128kl [rdx+126]
x86-64-keylocker.s:     aesencwide256kl [rdx+126]
and doesn't use any WHATEVER PTR.

2022-01-19  Jakub Jelinek  <jakub@redhat.com>

* config/i386/sse.md (*aes<aeswideklvariant>u*): Use %0 instead of
{%0}.

Come up with git-fix-changelog.py script.

contrib/ChangeLog:

* git-backport.py: Use it.
* git-fix-changelog.py: New file.
* gcc-git-customization.sh: Add new alias git gcc-fix-changelog.

nvptx: update fix for -Wformat-diag

gcc/ChangeLog:

* config/nvptx/nvptx.cc (nvptx_goacc_validate_dims_1): Update
warning messages.

libgomp/ChangeLog:

* testsuite/libgomp.oacc-c++/privatized-ref-2.C: Update scanning
patterns.
* testsuite/libgomp.oacc-c++/privatized-ref-3.C: Likewise.
* testsuite/libgomp.oacc-c-c++-common/acc_prof-kernels-1.c:
Likewise.
* testsuite/libgomp.oacc-c-c++-common/kernels-loop-2.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/parallel-dims.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/pr85486.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/pr95270-1.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/routine-nohost-2.c:
Likewise.
* testsuite/libgomp.oacc-c-c++-common/struct-copyout-1.c:
Likewise.
* testsuite/libgomp.oacc-c-c++-common/struct-copyout-2.c:
Likewise.
* testsuite/libgomp.oacc-c-c++-common/vector-length-64-1.c:
Likewise.
* testsuite/libgomp.oacc-fortran/attach-descriptor-1.f90:
Likewise.
* testsuite/libgomp.oacc-fortran/derivedtypes-arrays-1.f90:
Likewise.
* testsuite/libgomp.oacc-fortran/kernels-loop-2.f95: Likewise.
* testsuite/libgomp.oacc-fortran/parallel-dims.f90: Likewise.
* testsuite/libgomp.oacc-fortran/privatized-ref-1.f95: Likewise.

Co-authored-by: Thomas Schwinge <thomas@codesourcery.com>

testsuite/102833 - fix gcc.dg/vect/bb-slp-17.c dump scanning

The desired transform requires V2SI vector add support, the closest
we have is vect64 so check that which at least fixes the i?86 fail.

2022-01-19  Richard Biener  <rguenther@suse.de>

PR testsuite/102833
* gcc.dg/vect/bb-slp-17.c: Require vect64.

powerc: Fix asm machine directive for some CPUs

For some CPUs, the assembler machine directive cannot be determined by ISA
flags.

gcc/

PR target/104090
* config/rs6000/rs6000.cc (rs6000_machine_from_flags): Use also
rs6000_cpu.

Fix tsvc test build on DragonFly.

Currently all tsvc tests fail to build on DragonFly BSD because they
assume <malloc.h> and memalign() are available.

gcc/testsuite/ChangeLog:

PR testsuite/104021
* gcc.dg/vect/tsvc/tsvc.h: Do not include malloc.h on dragonfly
and use posix_memalign ().

Signed-off-by: Rimvydas Jasinskas <rimvydas.jas@gmail.com>

Add XFAIL parts of pr16855.C for dragonfly.

On DragonFly BSD profiling ends before these DTORs are invoked on dso cleanup.
The -static compilation works as expected.

gcc/testsuite/ChangeLog:

PR testsuite/104022
* g++.dg/gcov/pr16855.C: xfail the count lines for DTORs on dragonfly.
* g++.dg/gcov/pr16855-priority.C: Ditto.  Adjust source layout so that
dejagnu xfail expressions work.

Signed-off-by: Rimvydas Jasinskas <rimvydas.jas@gmail.com>

testsuite: fix pytest detection unsupported message.

PR testsuite/104109

gcc/testsuite/ChangeLog:

* lib/gcov.exp: Fix pytest detection unsupported message.

testsuite: Adjust possibly fragile slp-perm-9.c [PR104015]

As Richard pointed out in PR104015, the test case slp-perm-9.c
can be fragile when vectorizer tries to use different
vectorisation strategies.

As suggested, this patch tries to make the check not sensitive
on the re-trying times by removing the times checking.  To still
retain the test coverage on unnecessary re-trying, for example
it exposes this PR104015 on Power9, I added two test cases to
powerpc testsuite.

gcc/testsuite/ChangeLog:

PR tree-optimization/104015
* gcc.dg/vect/slp-perm-9.c: Adjust.
* gcc.target/powerpc/pr104015-1.c: New test.
* gcc.target/powerpc/pr104015-2.c: New test.

c++: fix PR104025 change

Somehow I pushed my earlier patch without it actually fixing the test; we
need input_location to be for the last consumed token, not the next one.

gcc/cp/ChangeLog:

* parser.cc (saved_token_sentinel::rollback): Use
cp_lexer_previous_token.

i386: Fix GLC tuning with -masm=intel [PR104104]

> > On Sat, Jan 15, 2022 at 5:39 PM Hongyu Wang <wwwhhhyyy333@gmail.com> wrote:
> > > Thanks for the suggestion, here is the updated patch that survived
> > > bootstrap/regtest.

Unfortunately the patch results in assembler failures with -masm=intel.

> > > > +  if (TARGET_DEST_FALSE_DEPENDENCY
> > > > +      && get_attr_dest_false_dep (insn) ==
> > > > +        DEST_FALSE_DEP_TRUE)
> > > > +    output_asm_insn ("vxorps\t{%x0, %x0, %x0}", operands);

All the vxorps insns were emitted like the above, which means for -masm=sysv
it looks like
        vxorps  %xmm3, %xmm3, %xmm3
but for -masm=intel like:
        vxorps
We want obviously
        vxorps  xmm3, xmm3, xmm3
so the following patch just drops the errorneous {}s.

2022-01-19  Jakub Jelinek  <jakub@redhat.com>

PR target/104104
* config/i386/sse.md
(<avx512>_<complexopname>_<mode><maskc_name><round_name>,
avx512fp16_<complexopname>sh_v8hf<mask_scalarc_name><round_scalarcz_name>,
avx512dq_mul<mode>3<mask_name>, <avx2_avx512>_permvar<mode><mask_name>,
avx2_perm<mode>_1<mask_name>, avx512f_perm<mode>_1<mask_name>,
avx512dq_rangep<mode><mask_name><round_saeonly_name>,
avx512dq_ranges<mode><mask_scalar_name><round_saeonly_scalar_name>,
<avx512>_getmant<mode><mask_name><round_saeonly_name>,
avx512f_vgetmant<mode><mask_scalar_name><round_saeonly_scalar_name>):
Use vxorps\t%x0, %x0, %x0 instead of vxorps\t{%x0, %x0, %x0}.

* gcc.target/i386/pr104104.c: New test.

Add test for bogus warning [PR104076].

Related:
PR middle-end/104076 - bogus -Wdangling-pointer on a conditional

gcc/testsuite/ChangeLog:
PR middle-end/104076
* g++.dg/warn/Wdangling-pointer-3.C: New test.

Suppress valid warning [PR104103].

gcc/testsuite/ChangeLog:
PR middle-end/104103
* gcc.dg/torture/pr57147-2.c: Prune out expected warning.

Handle failure to determine pointer provenance conservatively [PR104069].

Partly resolves:
PR middle-end/104069 - -Werror=use-after-free false positive on elfutils-0.186

gcc/ChangeLog:
PR middle-end/104069
* gimple-ssa-warn-access.cc (pointers_related_p): Return false for
an unknown result as documented.

gcc/testsuite/ChangeLog:
PR middle-end/104069
* gcc.dg/Wuse-after-free.c: New test.

libstdc++: Update documentation for C++17 deprecations

libstdc++-v3/ChangeLog:

* doc/xml/manual/evolution.xml: Document deprecations.
* doc/xml/manual/status_cxx2017.xml: Update status.
* doc/html/*: Regenerate.

libstdc++: Fix deprecated attribute for std::get_temporary_buffer

This was deprecated in C++17, not C++14.

libstdc++-v3/ChangeLog:

* include/bits/stl_tempbuf.h (get_temporary_buffer): Change
_GLIBCXX14_DEPRECATED to _GLIBCXX17_DEPRECATED.

libstdc++: Remove unused std::pair helper function

This function is no longer used since r12-6691 and can be removed.

libstdc++-v3/ChangeLog:

* include/bits/stl_pair.h (_PCC::_DeprConsPair): Remove unused
function.

libstdc++: Fix std::atomic<std::shared_ptr<T>> for AIX [PR104101]

This fixes an on AIX.

The lock function currently just spins, which should be changed to use
back-off, and maybe then _M_val.wait(__current) when supported.

libstdc++-v3/ChangeLog:

PR libstdc++/104101
* include/bits/shared_ptr_atomic.h (_Sp_atomic::_Atomic_count::lock):
Only use __thread_relax if __cpp_lib_atomic_wait is defined.

Daily bump.

[COMMITTED] Improve coment for the newly added code in ipa-split.

It was pointed out to me by Jakub, that the comment in front of
the new code which handles warning/error attribute was not really
understandable. This fixes the comment to be understandable; I
don't know why I wrote the original comment that way even.

Committed as obvious after a quick build.

gcc/ChangeLog:

* ipa-split.cc (visit_bb): Fix comment before the
warning/error attribute checking code.

c++: Fix handling of temporaries with consteval ctors and non-trivial dtors [PR104055]

The following testcase is miscompiled.  We see the constructor is immediate,
in build_over_call we trigger:
          if (obj_arg && is_dummy_object (obj_arg))
            {
              call = build_cplus_new (DECL_CONTEXT (fndecl), call, complain);
              obj_arg = NULL_TREE;
            }
which makes call a TARGET_EXPR with the dtor in TARGET_EXPR_CLEANUP,
but then call cxx_constant_value on it.  In cxx_eval_outermost_constant_expr
it triggers the:
      else if (TREE_CODE (t) != CONSTRUCTOR)
        {
          r = get_target_expr_sfinae (r, tf_warning_or_error | tf_no_cleanup);
          TREE_CONSTANT (r) = true;
        }
which wraps the CONSTRUCTOR r into a new TARGET_EXPR, but one without
dtors (I think we need e.g. the TREE_CONSTANT for the callers),
and finally build_over_call uses that.

The following patch fixes that by using get_target_expr instead
of get_target_expr_sfinae + TREE_CONSTANT (r) = true if t is
a TARGET_EXPR with non-NULL TARGET_EXPR_CLEANUP.

2022-01-19  Jakub Jelinek  <jakub@redhat.com>

PR c++/104055
* constexpr.cc (cxx_eval_outermost_constant_expr): If t is a
TARGET_EXPR with TARGET_EXPR_CLEANUP, use get_target_expr rather
than get_target_expr_sfinae with tf_no_cleanup, and don't set
TREE_CONSTANT.

* g++.dg/cpp2a/consteval27.C: New test.

c++: Use -std=c++20 in testsuite default std list

C++20 has been official for a while now.

gcc/testsuite/ChangeLog:

* lib/g++-dg.exp: Change 2a to 20.

c++: input_location and lookahead [PR104025]

Debug information was getting confused because input_location was different
depending on whether we had looked ahead to see if the next tokens look like
a template argument list.

I tried resetting input_location in cp_lexer_rollback_tokens itself, but
that caused regressions, so let's just do it here for now.

PR c++/104025

gcc/cp/ChangeLog:

* parser.cc (saved_token_sentinel::rollback): Call
cp_lexer_set_source_position.
(~saved_token_sentinel): Call rollback.

gcc/testsuite/ChangeLog:

* g++.dg/warn/pr104025.C: New test.

Co-authored-by: Jakub Jelinek <jakub@redhat.com>

bpf: ensure correct string offsets in BTF.ext

BPF CO-RE relocations contain offsets to strings buffered in the BTF
string table. These BTF-specific strings are stored in memory in the
CTF auxilliary strtab, which at output time is concatenated onto the end
of the standard strtab.

Previously, these string offsets were computed at the time the
relocations were created. But strings could be added to the standard
strtab after this point, causing the offsets to no longer be correct.

Compute the offsets just before output instead, when they are sure to no
longer change.

gcc/ChangeLog:

* config/bpf/coreout.cc (bpf_core_reloc_add): Do not account
for base strtab offset yet as it may change.
(output_asm_btfext_core_reloc): Do so here instead.
(output_btfext_core_sections): Likewise.

bpf: write CO-RE relocation record size only once

The CO-RE relocation record size should be written only once in the
.BTF.ext section, not once for each section with relocations.

gcc/ChangeLog:

* config/bpf/coreout.cc (output_btfext_header): Account for
4-byte record size in core_relo_len.
(output_btfext_core_sections): Only write record size once.
* config/bpf/coreout.h (btf_ext_section_header): Delete unused
member.

gcc/testsuite/ChangeLog:

* gcc.target/bpf/core-section-1.c: Adjust expected record size
occurrences.

analyzer: fix ICE on unary ops folding to casts of constants [PR104089]

gcc/analyzer/ChangeLog:
PR analyzer/104089
* region-model-manager.cc
(region_model_manager::get_or_create_constant_svalue): Assert that
we have a CONSTANT_CLASS_P.
(region_model_manager::maybe_fold_unaryop): Only fold a constant
when fold_unary's result is a constant or a cast of a constant.

gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/pr104089.c: New test.
PR analyzer/104089

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

analyzer: fix ICE on realloc of zeroed memory [PR104062]

gcc/analyzer/ChangeLog:
PR analyzer/104062
* region-model-manager.cc
(region_model_manager::maybe_fold_sub_svalue): Avoid casting to
NULL type when folding access to repeated svalue.

gcc/testsuite/ChangeLog:
PR analyzer/104062
* gcc.dg/analyzer/pr104062.c: New test.

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

libstdc++: Limit new basic_string(nullptr_t) constructor to C++23 [PR104099]

The new deleted constructors added by P2166R1 are a breaking change,
making previously valid code ill-formed in C++23. As a result, they
should only be defined for C++23 and not for C++11 and up.

libstdc++-v3/ChangeLog:

PR libstdc++/104099
* include/bits/basic_string.h (basic_string(nullptr_t)): Only
define for C++23.
(operator=(nullptr_t)): Likewise.
* include/bits/cow_string.h: Likewise.
* include/std/string_view (basic_string_view(nullptr_t)):
Likewise.
* testsuite/21_strings/basic_string/cons/char/nullptr.cc: Adjust
expected error. Add examples that become ill-formed in C++23.
* testsuite/21_strings/basic_string_view/cons/char/nonnull.cc:
Adjust expected errors.
* testsuite/21_strings/basic_string_view/cons/wchar_t/nonnull.cc:
Likewise.

c++: DEPENDENT_OPERATOR_TYPE as type of NTTP [PR104074]

We're incorrectly rejecting the below testcase during template argument
coercion because invalid_nontype_parm_type_p returns true for
DEPENDENT_OPERATOR_TYPE in C++17 mode.

This patch fixes this by partially rewriting invalid_nontype_parm_type_p
in terms of WILDCARD_TYPE_P, for which DEPENDENT_OPERATOR_TYPE is true,
so that the predicate handles wildcard types consistently.

PR c++/104074

gcc/cp/ChangeLog:

* pt.cc (invalid_nontype_parm_type_p): Use WILDCARD_TYPE_P so
that we return false for DEPENDENT_OPERATOR_TYPE too.

gcc/testsuite/ChangeLog:

* g++.dg/cpp1z/nontype-auto20.C: New test.

RISC-V: Fix use-after-free error in `parse_multiletter_ext'

Avoid undefined arithmetic involving a pointer to a heap allocation that
has been freed and move a problematic calculation ahead of the following
call to `free' in `riscv_subset_list::parse_multiletter_ext', removing a
compilation error:

.../gcc/common/config/riscv/riscv-common.cc: In member function 'const char* riscv_subset_list::parse_multiletter_ext(const char*, const char*, const char*)':
.../gcc/common/config/riscv/riscv-common.cc:905:27: error: pointer 'subset' used after 'void free(void*)' [-Werror=use-after-free]
  905 |       p += end_of_version - subset;
      |            ~~~~~~~~~~~~~~~^~~~~~~~
.../gcc/common/config/riscv/riscv-common.cc:904:12: note: call to 'void free(void*)' here
  904 |       free (subset);
      |       ~~~~~^~~~~~~~
cc1plus: all warnings being treated as errors
make[2]: *** [Makefile:2428: riscv-common.o] Error 1

and a build regression from commit 671a283636de ("Add -Wuse-after-free
[PR80532].").

gcc/
* common/config/riscv/riscv-common.cc
(riscv_subset_list::parse_multiletter_ext): Move pointer
arithmetic ahead of `free'.

Fortran: handle expansion of zero-sized array constructors

gcc/fortran/ChangeLog:

PR fortran/103692
* array.cc (gfc_expand_constructor): Handle zero-sized array
constructors.

gcc/testsuite/ChangeLog:

PR fortran/103692
* gfortran.dg/pr102520.f90: Adjust error messages.
* gfortran.dg/pr103692.f90: New test.

c++: new (nothrow) array cleanup [PR104007]

For this testcase, the cleanup that is supposed to happen if initialization
throws was wrongly being run on the normal control path as well.  This turns
out to be because the EH-only handling in gimple_push_cleanup didn't apply
to conditional cleanups such as we have for nothrow new, since we check
whether the result is non-null before proceeding with the initialization.

PR c++/104007

gcc/ChangeLog:

* gimplify.cc (gimple_push_cleanup): Handle eh_only in conditional
context.

gcc/testsuite/ChangeLog:

* g++.dg/eh/new2.C: New test.

middle-end: move initialization of stack_limit_rtx [PR103163]

stack_limit_rtx was being initialized before init_reg_modes_target (),
resulting in the REG expression being created incorrectly and an ICE
later in compilation.

2022-01-18  Sandra Loosemore  <sandra@codesourcery.com>

PR middle-end/103163

gcc/
* emit-rtl.cc (init_emit_regs): Initialize stack_limit_rtx here...
(init_emit_once): ...not here.

libstdc++: Use __cpp_lib_concepts in std::reverse_iterator [PR104098]

We should not assume that std::iter_value_t etc. are defined
unconditionally for C++20 mode.

libstdc++-v3/ChangeLog:

PR libstdc++/104098
* include/bits/stl_iterator.h (reverse_iterator): Check
__cpp_lib_concepts instead of __cplusplus.

libstdc++: Fix ambiguous std::pair constructors [PR101124]

The deprecated non-standard std::pair constructors that allow
constructing std::pair<move-only-type, pointer-type> from an rvalue and
a literal zero where not sufficiently constrained. They were viable when
constructing std::pair<copyable-type, pointer-type>, and that case
should work fine using the standard constructors.

Replace the constraints on the non-standard constructors so they are
only viable in cases that should actually be ill-formed according to the
standard.

Also rename __null_ptr_constant to __zero_as_null_pointer_constant so it
matches the name of the -Wzero-as-null-pointer-constant warning. Also
make the text of the deprecated warning describe the problem in more
detail.

libstdc++-v3/ChangeLog:

PR libstdc++/101124
* include/bits/stl_pair.h (pair): Adjust constraints on
deprecated constructors accepting literal zero as null pointer
constant. Improve wording of deprecated attribute.
* testsuite/20_util/pair/cons/99957.cc: Check that deprecated
constructors do not cause ambiguities for copyable types.

libstdc++: Fix suggested alternative to std::ptr_fun

libstdc++-v3/ChangeLog:

* include/bits/stl_function.h (ptr_fun): Fix suggestion for
non-deprecated alternative.

libstdc++: Declare std::c8rtomb and std::mbrtoc8 if provided by the C library

This patch completes implementation of the C++20 proposal P0482R6 [1] by
adding declarations of std::c8rtomb() and std::mbrtoc8() in <cuchar> if
provided by the C library in <uchar.h>.

This patch addresses feedback provided in response to a previous patch
submission [2].

Autoconf changes determine if the C library declares c8rtomb and mbrtoc8
at global scope when uchar.h is included and compiled with either
-fchar8_t or -std=c++20. New _GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_FCHAR8_T
and _GLIBCXX_USE_UCHAR_C8RTOMB_MBRTOC8_CXX20 configuration macros
reflect the probe results. The <cuchar> header declares these functions
in the std namespace only if available and the _GLIBCXX_USE_CHAR8_T
configuration macro is defined (by default it is defined if the C++20
__cpp_char8_t feature test macro is defined)

Patches to glibc to implement c8rtomb and mbrtoc8 have been submitted [3].

New tests validate the presence of these declarations. The tests pass
trivially if the C library does not provide these functions. Otherwise
they ensure that the functions are declared when <cuchar> is included
and either -fchar8_t or -std=c++20 is enabled.

1]: WG21 P0482R6
      "char8_t: A type for UTF-8 characters and strings (Revision 6)"
      https://wg21.link/p0482r6

[2]: [PATCH] C++ P0482R6 char8_t: declare std::c8rtomb and std::mbrtoc8
if provided by the C library
      https://gcc.gnu.org/pipermail/libstdc++/2021-June/052685.html

[3]: "C++20 P0482R6 and C2X N2653"
      [Patch 0/3]:
https://sourceware.org/pipermail/libc-alpha/2022-January/135061.html
      [Patch 1/3]:
https://sourceware.org/pipermail/libc-alpha/2022-January/135062.html
      [Patch 2/3]:
https://sourceware.org/pipermail/libc-alpha/2022-January/135063.html
      [Patch 3/3]:
https://sourceware.org/pipermail/libc-alpha/2022-January/135064.html

libstdc++-v3/ChangeLog:

* acinclude.m4: Define config macros if uchar.h provides
c8rtomb() and mbrtoc8().
* config.h.in: Regenerate.
* configure: Regenerate.
* include/c_compatibility/uchar.h (c8rtomb, mbrtoc8): Define.
* include/c_global/cuchar (c8rtomb, mbrtoc8): Likewise.
* include/c_std/cuchar (c8rtomb, mbrtoc8): Likewise.
* testsuite/21_strings/headers/cuchar/functions_std_cxx20.cc:
New test.
* testsuite/21_strings/headers/cuchar/functions_std_fchar8_t.cc:
New test.

libstdc++: Define <stdatomic.h> for C++23

This adds the C++23 <stdatomic.h> header, as proposed by P0943R6, for
compatibility with C code.

There are still some ABI differences between atomic_xxx in C and C++
std::atomic_xxx in C++, so this only provides source compatibility, not
binary compatibility.

libstdc++-v3/ChangeLog:

* include/Makefile.am: Install new header.
* include/Makefile.in: Regenerate.
* include/c_compatibility/stdatomic.h: New file.
* testsuite/29_atomics/headers/stdatomic.h/c_compat.cc: New test.

Fix -Wformat-diag in various targets.

gcc/ChangeLog:

* collect2.cc (scan_libraries): Fix -Wformat-diag issues.
* config/aarch64/aarch64-builtins.cc (aarch64_simd_expand_builtin): Likewise.
* config/arc/arc.md: Likewise.
* config/avr/avr.cc (avr_section_type_flags): Likewise.
* config/bfin/bfin.cc (bfin_option_override): Likewise.
(bfin_handle_longcall_attribute): Likewise.
* config/cris/cris.h (FUNCTION_PROFILER): Likewise.
* config/frv/frv.cc (frv_expand_builtin): Likewise.
* config/ia64/ia64-c.cc (ia64_hpux_handle_builtin_pragma): Likewise.
* config/iq2000/iq2000.cc (save_restore_insns): Likewise.
(iq2000_print_operand_address): Likewise.
(iq2000_print_operand): Likewise.
* config/m32c/m32c-pragma.cc (m32c_pragma_memregs): Likewise.
(m32c_pragma_address): Likewise.
* config/m68k/m68k.cc (m68k_handle_fndecl_attribute): Likewise.
* config/mips/mips.cc (mips_handle_interrupt_attr): Likewise.
(mips_set_compression_mode): Likewise.
* config/mmix/mmix.cc (mmix_function_profiler): Likewise.
(mmix_print_operand): Likewise.
(mmix_output_shiftvalue_op_from_str): Likewise.
(mmix_output_shifted_value): Likewise.
* config/msp430/driver-msp430.cc (msp430_select_hwmult_lib): Likewise.
* config/msp430/msp430.cc (msp430_option_override): Likewise.
(msp430_attr): Likewise.
(msp430_expand_delay_cycles): Likewise.
(msp430_expand_builtin): Likewise.
* config/rs6000/aix73.h: Likewise.
* config/rs6000/rtems.h (INVALID_64BIT): Likewise.
* config/rx/rx.cc (rx_expand_builtin_mvtc): Likewise.
(valid_psw_flag): Likewise.
* config/sh/sh.cc (parse_validate_atomic_model_option): Likewise.
* config/stormy16/stormy16.cc (xstormy16_function_profiler): Likewise.
(xstormy16_expand_builtin_va_start): Likewise.
(xstormy16_handle_below100_attribute): Likewise.

vms: fix -Wformat-diag warnings.

gcc/ChangeLog:

* config/vms/vms-c.cc (vms_pragma_nostandard): Fix -Wformat-diag
warning.
(vms_pragma_standard): Likewise.
(vms_pragma_extern_prefix): Likewise.

xtensa: fix -Wformat-diag warnings.

gcc/ChangeLog:

* config/xtensa/xtensa.cc (print_operand): Fix warnings.
(print_operand_address): Likewise.
(xtensa_multibss_section_type_flags): Likewise.

rs6000: fix last -Wformat-diag

gcc/ChangeLog:

* config/rs6000/rs6000-call.cc (rs6000_invalid_builtin): Change
wording of an error message.

gcc/testsuite/ChangeLog:

* gcc.target/powerpc/bfp/scalar-extract-exp-5.c: Update scanned
pattern.
* gcc.target/powerpc/bfp/scalar-extract-sig-5.c: Likewise.
* gcc.target/powerpc/bfp/scalar-insert-exp-11.c: Likewise.

v850: fix -Wformat-diag warnings.

gcc/ChangeLog:

* config/v850/v850-c.cc (pop_data_area): Fix -Wformat-diag
warning.
(ghs_pragma_section): Likewise.
(ghs_pragma_interrupt): Likewise.
(ghs_pragma_starttda): Likewise.
(ghs_pragma_startsda): Likewise.
(ghs_pragma_startzda): Likewise.
(ghs_pragma_endtda): Likewise.
(ghs_pragma_endsda): Likewise.
(ghs_pragma_endzda): Likewise.

nds32: fix -Wformat-diag warning.

gcc/ChangeLog:

* config/nds32/nds32-intrinsic.cc (nds32_expand_builtin_impl):
Fix warnings.
* config/nds32/nds32-intrinsic.md: Likewise.
* config/nds32/nds32-isr.cc (nds32_check_isr_attrs_conflict): Likewise.
* config/nds32/nds32.cc (nds32_print_operand): Likewise.
(nds32_insert_attributes): Likewise.

nvptx: fix -Wformat-diag warnings

gcc/ChangeLog:

* config/nvptx/nvptx.cc (nvptx_goacc_validate_dims_1): Wrap
keyword.
* config/nvptx/nvptx.md: Remove trailing dot.

libgomp/ChangeLog:

* testsuite/libgomp.oacc-c++/privatized-ref-2.C: Update keyword
in dg-warning.
* testsuite/libgomp.oacc-c++/privatized-ref-3.C: Likewise.
* testsuite/libgomp.oacc-c-c++-common/acc_prof-kernels-1.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/kernels-loop-2.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/parallel-dims.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/pr85486.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/pr95270-1.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/routine-nohost-2.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/struct-copyout-1.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/struct-copyout-2.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/vector-length-64-1.c: Likewise.
* testsuite/libgomp.oacc-fortran/attach-descriptor-1.f90: Likewise.
* testsuite/libgomp.oacc-fortran/derivedtypes-arrays-1.f90: Likewise.
* testsuite/libgomp.oacc-fortran/kernels-loop-2.f95: Likewise.
* testsuite/libgomp.oacc-fortran/parallel-dims.f90: Likewise.
* testsuite/libgomp.oacc-fortran/privatized-ref-1.f95: Likewise.

riscv: fix -Wformat-diag errors.

gcc/ChangeLog:

* common/config/riscv/riscv-common.cc (riscv_subset_list::add):
Wrap keywords with quotes and remove trailing dots.
(riscv_subset_list::parsing_subset_version): Likewise.
(riscv_subset_list::parse_std_ext): Likewise.
(riscv_subset_list::parse_multiletter_ext): Likewise.
* config/riscv/riscv.cc (riscv_handle_type_attribute): Likewise.

[vect] Add main vectorized loop unrolling

gcc/ChangeLog:

* tree-vect-loop.cc (vect_estimate_min_profitable_iters): Pass new
argument suggested_unroll_factor.
(vect_analyze_loop_costing): Likewise.
(_loop_vec_info::_loop_vec_info): Initialize new member
suggested_unroll_factor.
(vect_determine_partial_vectors_and_peeling): Make epilogue of unrolled
main loop use partial vectors.
(vect_analyze_loop_2): Pass and use new argument
suggested_unroll_factor.
(vect_analyze_loop_1): Change to intialize local
suggested_unroll_factor and use it.
(vectorizable_reduction): Don't use single_defuse_cycle when unrolling.
* tree-vectorizer.h (_loop_vec_info::_loop_vec_info): Add new member
suggested_unroll_factor.
(vector_costs::vector_costs): Add new member m_suggested_unroll_factor.
(vector_costs::suggested_unroll_factor): New getter function.
(finish_cost): Set return argument suggested_unroll_factor.

Limit the number of relations registered per basic block.

In pathological cases, the number of transitive relations being added is
potentially quadratic.  Lookups for relations in a block is linear in
nature, so simply limit the number of relations to some reasonable number.

PR tree-optimization/104038
* doc/invoke.texi (relation-block-limit): New.
* params.opt (relation-block-limit): New.
* value-relation.cc (dom_oracle::register_relation): Check for NULL
record before invoking transitive registery.
(dom_oracle::set_one_relation): Check limit before creating record.
(dom_oracle::register_transitives): Stop when no record created.
* value-relation.h (relation_chain_head::m_num_relations): New.

ipa/103989 - avoid IPA inlining of small functions with -Og

The following change avoids doing IPA inlining of small functions
into functions compiled with -Og - those functions will see almost no
followup scalar cleanups so that the benefit anticipated by the
inliner will not be realized and instead the late diagnostic code
will be confused by dead code that is left around.

2022-01-18  Richard Biener  <rguenther@suse.de>

PR ipa/103989
* ipa-inline.cc (inline_small_functions): Do not enqueue call
edges originating in functions compiled with -Og.

* g++.dg/opt/pr103989.C: New testcase.

ipa/103989 - tame IPA optimizations at -Og

With -Og we are not prepared to do cleanup after IPA optimizations
and dead code exposed by those confuses late diagnostic passes.
This is a first patch removing unwanted IPA optimizations, namely
both late modref and pure-const analysis.

2022-01-18  Richard Biener  <rguenther@suse.de>

PR ipa/103989
* passes.def (pass_all_optimizations_g): Remove pass_modref
and pass_local_pure_const.

Fix -Wformat-diag for s390x-ibm-tpf.

gcc/ChangeLog:

* config/s390/s390.cc: Fix -Wformat-diag warnings.

Fix -Wformat-diag for s390x target.

gcc/ChangeLog:

* config/s390/s390-c.cc (s390_expand_overloaded_builtin): Wrap
keyword in quotes.
(s390_resolve_overloaded_builtin): Remove trailing dot.
* config/s390/s390.cc (s390_const_operand_ok): Use - for range.
(s390_expand_builtin): Remove trailing dot.
(s390_emit_prologue): Likewise, use semicolon.
(s390_option_override_internal): Update keyword.
* varasm.cc (do_assemble_alias): Wrap keyword in quotes.

Fix -Wformat-diag for rs6000 target (part 1).

gcc/ChangeLog:

* config/rs6000/rs6000-call.cc (rs6000_expand_builtin): Wrap
keywords and use %qs instead of %<%s%>.

tree-optimization/103987 - guard DSE modref query

This adds a missing guard for a pointer to the DSE modref query,
otherwise we can end up invoking APIs desired to only work on
pointers on non-pointers when there are mismatches between declared
and actual arguments of functions in the program.

2022-01-18  Richard Biener  <rguenther@suse.de>

PR tree-optimization/103987
* tree-ssa-dse.cc (dse_optimize_call): Properly guard modref
query with a pointer check.

* gcc.dg/torture/pr103987.c: New testcase.

pack fields in line-map data structures

As pointed out by pahole.

2022-01-18  Richard Biener  <rguenther@suse.de>

libcpp/
* include/line-map.h (class line_maps): Re-arrange fields
to minimize padding.
(class rich_location): Likewise.
* line-map.cc (rich_location::rich_location): Adjust.

Update email address

ChangeLog:

* MAINTAINERS: Update my email address.

aarch64: Fix overly optimistic LDP/STP matching [PR104005]

In g:526e1639aa76b0a8496b0dc3a3ff2c450229544e I'd added support
for finding more consecutive MEMs.  However, the check was too
eager, in that it matched MEM_REFs with the same base address
even if that base address was an arbitrary SSA name.  This can
give wrong results if a MEM_REF from one loop iteration is
compared with a MEM_REF from another (e.g. after rtl unrolling).

In principle, we could still accept MEM_REFs based on the same
incoming SSA name, but there seems to be no out-of-the-box API
for doing that.  Adding a new one at this stage in GCC 12 doesn't
feel like a good risk/reward trade-off.

This patch therefore restricts the MEM_EXPR comparison to base decls
only, excluding all MEM_REFs.  It means we lose all the new STPs in
the PR testcase but keep the ones in the original stp_1.c testcase.

gcc/
PR target/104005
* config/aarch64/aarch64.cc (aarch64_check_consecutive_mems):
When using MEM_EXPR, require the base to be a decl.

gcc/testsuite/
PR target/104005
* gcc.target/aarch64/pr104005.c: New test.

pack fields in cgraph_simd_clone_arg and struct function

As pointed out by pahole.

2022-01-18  Richard Biener  <rguenther@suse.de>

* cgraph.h (struct cgraph_simd_clone_arg): Re-arrange fields to
avoid padding.
* function.h (struct function): Likewise.

Update prerequisites for GNAT

* doc/install.texi: Update prerequisites for GNAT

Fix tree-optimization/101941: IPA splitting out function with error attribute

The Linux kernel started to fail compile when the jump threader was improved
(r12-2591-g2e96b5f14e4025691). This failure was due to the IPA splitting code
decided now to split off the basic block which contained two functions,
one of those functions included the error attribute on them.  This patch fixes
the problem by disallowing basic blocks from being split which contain functions
that have either the error or warning attribute on them.

The two new testcases are to make sure we still split the function for other
places if we reject the one case.

Committed as approved after Bootstrapped and tested on x86_64-linux-gnu with no regressions.

PR tree-optimization/101941

gcc/ChangeLog:

* ipa-split.cc (visit_bb): Disallow function calls where
the function has either error or warning attribute.

gcc/testsuite/ChangeLog:

* gcc.c-torture/compile/pr101941-1.c: New test.
* gcc.dg/tree-ssa/pr101941-1.c: New test.

libstdc++: Use GCC's predefined macro for endianness [PR104080]

Instead of hardcoded preprocessor conditionals with explicit target
checks, just rely on the fact that __BYTE_ORDER__ is always defined by
GCC.

libstdc++-v3/ChangeLog:

PR libstdc++/104080
* src/c++17/fast_float/LOCAL_PATCHES: Update.
* src/c++17/fast_float/fast_float.h (FASTFLOAT_IS_BIG_ENDIAN):
Define in terms of __BYTE_ORDER__.

libstdc++: Fix deduction failure for std::min call [PR104080]

libstdc++-v3/ChangeLog:

PR libstdc++/104080
* src/c++17/fast_float/LOCAL_PATCHES: UPDATE.
* src/c++17/fast_float/fast_float.h (round): Use explicit
template argument list for std::min.

libstdc++: Update status tables in manual

libstdc++-v3/ChangeLog:

* doc/xml/manual/status_cxx2017.xml: Update C++17 status.
* doc/xml/manual/status_cxx2020.xml: Use 12.1 instead of 12 for
upcoming release.
* doc/html/manual/status.html: Regenerate.

libstdc++: Improve comments describing --enable-fully-dynamic-string

libstdc++-v3/ChangeLog:

* acinclude.m4 (GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING): Improve
comments.
* configure: Regenerate.

Add check_effective_target_python3_module.

gcc/testsuite/ChangeLog:

* gcc.src/maintainers.exp: Use
check_effective_target_python3_module for checking of unicode
module.
* lib/target-supports.exp: Add
check_effective_target_python3_module.

tree-optimization/104064 - UBSAN issue in vect dataref analysis

Since we order DRs after DR_INIT we know the difference will be
positive and thus can avoid signed overflow issues by using
unsigned arithmetic to produce the known unsigned result.

2022-01-18  Richard Biener  <rguenther@suse.de>

PR tree-optimization/104064
* tree-vect-data-refs.cc (vect_analyze_data_ref_accesses): Check
DR_INIT fits in a signed HWI, represent the difference from the
first DR in unsigned.

Ada: Revert filename changes in comments.

gcc/ada/ChangeLog:

* adaint.c: Revert filename changes in comments.
* ctrl_c.c (dummy_handler): Likewise.
* gsocket.h: Likewise.
* init.c (__gnat_error_handler): Likewise.
* libgnarl/s-intman.ads: Likewise.
* libgnarl/s-osinte__android.ads: Likewise.
* libgnarl/s-osinte__darwin.ads: Likewise.
* libgnarl/s-osinte__hpux.ads: Likewise.
* libgnarl/s-osinte__linux.ads: Likewise.
* libgnarl/s-osinte__qnx.ads: Likewise.
* libgnarl/s-taskin.ads: Likewise.
* rtfinal.c: Likewise.

Revert Ada .cc renaming renaming.

gcc/ada/ChangeLog:

* Make-generated.in: Revert renaming changes.
* Makefile.rtl: Likewise.
* adadecode.cc: Moved to...
* adadecode.c: ...here.
* affinity.cc: Moved to...
* affinity.c: ...here.
* argv-lynxos178-raven-cert.cc: Moved to...
* argv-lynxos178-raven-cert.c: ...here.
* argv.cc: Moved to...
* argv.c: ...here.
* aux-io.cc: Moved to...
* aux-io.c: ...here.
* cio.cc: Moved to...
* cio.c: ...here.
* cstreams.cc: Moved to...
* cstreams.c: ...here.
* env.cc: Moved to...
* env.c: ...here.
* exit.cc: Moved to...
* exit.c: ...here.
* expect.cc: Moved to...
* expect.c: ...here.
* final.cc: Moved to...
* final.c: ...here.
* gcc-interface/Makefile.in:
* init.cc: Moved to...
* init.c: ...here.
* initialize.cc: Moved to...
* initialize.c: ...here.
* libgnarl/thread.cc: Moved to...
* libgnarl/thread.c: ...here.
* link.cc: Moved to...
* link.c: ...here.
* locales.cc: Moved to...
* locales.c: ...here.
* mkdir.cc: Moved to...
* mkdir.c: ...here.
* raise.cc: Moved to...
* raise.c: ...here.
* rtfinal.cc: Moved to...
* rtfinal.c: ...here.
* rtinit.cc: Moved to...
* rtinit.c: ...here.
* s-oscons-tmplt.c (CND): Revert renaming changes.
* seh_init.cc: Moved to...
* seh_init.c: ...here.
* sigtramp-armdroid.cc: Moved to...
* sigtramp-armdroid.c: ...here.
* sigtramp-ios.cc: Moved to...
* sigtramp-ios.c: ...here.
* sigtramp-qnx.cc: Moved to...
* sigtramp-qnx.c: ...here.
* sigtramp-vxworks.cc: Moved to...
* sigtramp-vxworks.c: ...here.
* socket.cc: Moved to...
* socket.c: ...here.
* tracebak.cc: Moved to...
* tracebak.c: ...here.
* version.cc: Moved to...
* version.c: ...here.
* vx_stack_info.cc: Moved to...
* vx_stack_info.c: ...here.

Fix options.exp.

gcc/testsuite/ChangeLog:

* gcc.misc-tests/options.exp: Include renamed file.