make_forwarders_with_degenerate_phis causes a -fcompare-debug failure on the
following testcase.
The problem is that on:
  # iftmp.4_8 = PHI <&D.2582(6), &D.2583(4), &D.2582(7), &D.2583(5)>
the exact DECL_UIDs are different between -g and -g0 (which is ok, with -g
the decls can have larger gaps in between the uids), which means
iterative_hash_expr is different and because there are 2 pairs of edges
with matching phi arguments, the function processes them in different
orders.
The following patch fixes it by using the iterative_hash_expr order
only to determine which arguments are the same, then replaces the hashes
with the minimum dest_idx in the set of matching arguments and qsorts
again (which makes it stable for -fcompare-debug) and only splits edges etc.
on that stable order.
As a small optimization, if no arguments are equal, it doesn't do the
second qsort and continues, and if all arguments of the PHI are
constants or SSA_NAMEs (I think that is a pretty common case for many
PHIs), then it doesn't do the second qsort either, because in that case
the hash values will be stable, only computed from the constant values or
SSA_NAME_VERSIONs.

2021-12-29  Jakub Jelinek  <jakub@redhat.com>

	PR debug/103742
	* tree-ssa-dce.c (make_forwarders_with_degenerate_phis): If any phi
	argument is not CONSTANT_CLASS_P or SSA_NAME and any arguments are
	equal, change second from hash value to lowest dest_idx from the
	edges which have equal argument and resort to ensure -fcompare-debug
	stability.

	* g++.dg/opt/pr103742.C: New test.

Fortran 2018 added some synonyms to the existing values, namely
IEEE_NEGATIVE_SUBNORMAL (which is the same as IEEE_NEGATIVE_DENORMAL)
and IEEE_POSITIVE_SUBNORMAL (same as IEEE_POSITIVE_DENORMAL). When they
were added to the C side, they were not kept in sync with the Fortran
part of the library. Thew new values are not used (yet), so it is
currently harmless, but better fix it.

libgfortran/ChangeLog:

	* ieee/ieee_helper.c: Fix enum values.

Warnings like:

    warning: using serial compilation of 2 LTRANS jobs
    warning: visibility attribute not supported in this configuration; ignored\[^\n\]*" $text "" text

are pruned by lto.exp, but not for LTO testcases when run in other parts
of the testsuite. They will be, now.

gcc/testsuite/ChangeLog:

	PR testsuite/47334
	PR testsuite/103823
	* lib/prune.exp: Prune some warnings related to LTO and
	visibility.

gcc/fortran/ChangeLog:

	PR fortran/102332
	* expr.c (gfc_get_variable_expr): Avoid NULL pointer dereferences
	during handling of errors with invalid uses of CLASS variables.
	* match.c (select_type_set_tmp): Likewise.
	* primary.c (gfc_match_varspec): Likewise.
	* resolve.c (resolve_variable): Likewise.
	(resolve_select_type): Likewise.

gcc/testsuite/ChangeLog:

	PR fortran/102332
	* gfortran.dg/pr102332.f90: New test.

gcc/ChangeLog:

	* collect2.c (main): Add ld.mold.
	* common.opt: Add -fuse-ld=mold.
	* doc/invoke.texi: Document it.
	* gcc.c (driver_handle_option): Handle -fuse-ld=mold.
	* opts.c (common_handle_option): Likewise.

lowpart_subreg might fail in some cases when trying to create paradoxical
SUBREGs.  Use force_reg on input operand, use new temporary output operand
and emit move into the destination afterwards.

Also, replace simplify_gen_subreg (Mx, op, My, 0)
with equivalent lowpart_subreg (Mx, op, My).

2021-12-29  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	* config/i386/sse.md (vec_pack<floatprefix>_float_<mode>):
	Perform gen_avx512dq_float<floatunssuffix>v2div2sf2 into a
	pseudo and emit move insn into operands[0].
	(fix<fixunssuffix>_truncv2sfv2di2): Use lowpart_subreg
	instead of simplify_gen_subreg.
	(trunc<mode><pmov_dst_3_lower>2): Perform
	gen_avx512vl_truncate<mode>v<ssescalarnum>qi2 into a
	pseudo and emit move insn into operands[0].
	(trunc<mode><pmov_dst_4_lower>2): Perform
	gen_avx512vl_truncate<mode>v<ssescalarnum>hi2 into a
	pseudo and emit move insn into operands[0].
	(truncv2div2si2): Perform gen_avx512vl_truncatev2div2si2 into a
	pseudo and emit move insn into operands[0].
	(truncv8div8qi2): Perform gen_avx512f_truncatev8div16qi2 into a
	pseudo and emit move insn into operands[0].
	(<any_extend:insn>v8qiv8hi2): Use lowpart_subreg
	instead of simplify_gen_subreg.
	(<any_extend:insn>v8qiv8si2): Ditto.
	(<any_extend:insn>v4qiv4si2): Ditto.
	(<any_extend:insn>v4hiv4si2): Ditto.
	(<any_extend:insn>v8qiv8di2): Ditto.
	(<any_extend:insn>v4qiv4di2): Ditto.
	(<any_extend:insn>v2qiv2di2): Ditto.
	(<any_extend:insn>v4hiv4di2): Ditto.
	(<any_extend:insn>v2hiv2di2): Ditto.
	(<any_extend:insn>v2siv2di2): Ditto.

no-guess-branch-probability option requires profile_count scaling with
initialized_p guard, use multiply instead of apply_scale, which will do
the right thing to undefined probabilities and will not cause unnecesary
roundoff errors and precision info loss.
Also merge the missed part of r12-6086 of factor out function to avoid
duplicate code.

Regression testest pass on Power and X86.

gcc/ChangeLog:

	PR tree-optimization/103793
	* tree-ssa-loop-split.c (fix_loop_bb_probability): New function.
	(split_loop): Use multiply to scale loop1's exit probability.
	(do_split_loop_on_cond): Call fix_loop_bb_probability.

gcc/testsuite/ChangeLog:

	PR tree-optimization/103793
	* gcc.dg/pr103793.c: New test.

On non-ELF targets, the Makefile needs a newline inside the sed REPLACE
string. The way it is currently done fails with GNU Make < 4, but GCC
only requires "GNU make version 3.80 (or later)".

The portable solution is given in the autoconf manual:
https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Newlines-in-Make-Rules.html

libbacktrace/ChangeLog:

	PR libbacktrace/103822

	* Makefile.am: Fix newline.
	* Makefile.in: Regenerate.

Make the front-end emit the right type for CHARACTER(C_CHAR), VALUE
arguments to BIND(C) procedures. They are scalar integers of C type
char, and should be emitted as such. They are not strings or arrays,
and are not promoted to C int, either.

gcc/fortran/ChangeLog:

	PR fortran/103828
	* trans-decl.c (generate_local_decl): Do not call
	gfc_conv_scalar_char_value(), but check the type tree.
	* trans-expr.c (gfc_conv_scalar_char_value): Rename to
	conv_scalar_char_value, do not alter type tree.
	(gfc_conv_procedure_call): Adjust call to renamed
	conv_scalar_char_value() function.
	* trans-types.c (gfc_sym_type): Take care of
	CHARACTER(C_CHAR), VALUE arguments.
	* trans.h (gfc_conv_scalar_char_value): Remove prototype.

gcc/testsuite/ChangeLog:

	PR fortran/103828
	* gfortran.dg/c_char_tests_3.f90: New file.
	* gfortran.dg/c_char_tests_3_c.c: New file.
	* gfortran.dg/c_char_tests_4.f90: New file.
	* gfortran.dg/c_char_tests_5.f90: New file.

BOOLEAN_TYPE also counts as integral, so verify_type should allow it.

	PR c++/99968

gcc/ChangeLog:

	* tree.c (verify_type): Allow enumerator with BOOLEAN_TYPE.

gcc/testsuite/ChangeLog:

	* g++.dg/ext/is_enum2.C: New test.

Some time ago I've changed const_binop -> wide_int_binop, so that it punts
on shifts by negative count.  fold_truth_andor_1 doesn't check the results
of const_binop (?SHIFT_EXPR, ) though and assumes they will be always
non-NULL, which is no longer the case.

2021-12-28  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/103813
	* fold-const.c (fold_truth_andor_1): Punt of const_binop LSHIFT_EXPR
	or RSHIFT_EXPR returns NULL.  Formatting fix.

	* gcc.c-torture/compile/pr103813.c: New test.

In the following testcase we have a -fcompare-debug failure, because
can_move_invariant_reg doesn't ignore DEBUG_INSNs in its decisions.
In the testcase we have due to uninitialized variable:
  loop_header
    debug_insn using pseudo84
    pseudo84 = invariant
    insn using pseudo84
  end loop
and with -g decide not to move the pseudo84 = invariant before the
loop header; in this case not resetting the debug insns might be fine.
But, we could have also:
  pseudo84 = whatever
  loop_header
    debug_insn using pseudo84
    pseudo84 = invariant
    insn using pseudo84
  end loop
and in that case not resetting the debug insns would result in wrong-debug.
And, we don't really have generally a good substitution on what pseudo84
contains, it could inherit various values from different paths.
So, the following patch ignores DEBUG_INSNs in the decisions, and if there
are any that previously prevented the optimization, resets them before
return true.

2021-12-28  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/103837
	* loop-invariant.c (can_move_invariant_reg): Ignore DEBUG_INSNs in
	the decisions whether to return false or continue and right before
	returning true reset those debug insns that previously caused
	returning false.

	* gcc.dg/pr103837.c: New test.

These two spots are meant to punt if the newly added code contains
any CALL_INSNs, because in that case having a large sequence of insns
that also calls something is undesirable, better have one call that
is optimized in itself well.
The functions do last = get_last_insn (); before emitting any insns
(and expand_binop as the ultimate caller uses delete_insns_since if
the expansion fails), but the checks were incorrect for 2 reasons:
1) it checked not just what follows after that last insn, but also
   the last insn itself; so, if the division or modulo is immediately
   preceded by a CALL_INSN, then we punt; this also causes -fcompare-debug
   failures if the CALL_INSN is with -g followed by one or more DEBUG_INSNs
2) if get_last_insn () is NULL (i.e. emitting into a new sequence), then
   we didn't check anything

2021-12-28  Jakub Jelinek  <jakub@redhat.com>

	PR debug/103838
	* optabs.c (expand_doubleword_mod, expand_doubleword_divmod): Only
	check newly added insns for CALL_P, not the last insn of previous
	code.

	* gcc.dg/pr103838.c: New test.

gcc/d/ChangeLog:

	* gdc.texi: Use one more https.

It happens that options are parsed and various diagnostics happen
in finish_options. That's a proper place as the function is also called
for optimize/target attributes (pragmas). However, it is possible that
target overwrites an option from command line and so the diagnostics
does not happen. That's fixed in the patch.

- options are parsed and finish_options is called:

  if (opts->x_flag_unwind_tables
      && !targetm_common.unwind_tables_default
      && opts->x_flag_reorder_blocks_and_partition
      && (ui_except == UI_SJLJ || ui_except >= UI_TARGET))
    {
      if (opts_set->x_flag_reorder_blocks_and_partition)
        inform (loc,
		"%<-freorder-blocks-and-partition%> does not support "
		"unwind info on this architecture");
      opts->x_flag_reorder_blocks_and_partition = 0;
      opts->x_flag_reorder_blocks = 1;
    }

It's not triggered because of opts->x_flag_unwind_tables is false by default, but
the option is overwritten in target:

...
  if (TARGET_64BIT_P (opts->x_ix86_isa_flags))
    {
      if (opts->x_optimize >= 1)
	SET_OPTION_IF_UNSET (opts, opts_set, flag_omit_frame_pointer,
			     !USE_IX86_FRAME_POINTER);
      if (opts->x_flag_asynchronous_unwind_tables
	  && TARGET_64BIT_MS_ABI)
	SET_OPTION_IF_UNSET (opts, opts_set, flag_unwind_tables, 1);
...

	PR driver/103465

gcc/ChangeLog:

	* opts.c (finish_options): More part of diagnostics to ...
	(diagnose_options): ... here. Call the function from both
	finish_options and process_options.
	* opts.h (diagnose_options): Declare.
	* toplev.c (process_options): Call diagnose_options.

I replaced and verified http:// links for various domains.

gcc/ada/ChangeLog:

	* doc/share/gnu_free_documentation_license.rst: Replace http:// with https.
	* gnat-style.texi: Likewise.
	* gnat_rm.texi: Likewise.
	* gnat_ugn.texi: Likewise.

gcc/d/ChangeLog:

	* gdc.texi: Replace http:// with https.

gcc/ChangeLog:

	* doc/contrib.texi: Replace http:// with https.
	* doc/contribute.texi: Likewise.
	* doc/extend.texi: Likewise.
	* doc/gccint.texi: Likewise.
	* doc/gnu.texi: Likewise.
	* doc/implement-c.texi: Likewise.
	* doc/implement-cxx.texi: Likewise.
	* doc/include/fdl.texi: Likewise.
	* doc/include/gpl_v3.texi: Likewise.
	* doc/install.texi: Likewise.
	* doc/invoke.texi: Likewise.
	* doc/passes.texi: Likewise.
	* doc/service.texi: Likewise.
	* doc/sourcebuild.texi: Likewise.
	* doc/standards.texi: Likewise.

gcc/fortran/ChangeLog:

	* gfortran.texi: Replace http:// with https.
	* intrinsic.texi: Likewise.

gcc/go/ChangeLog:

	* gccgo.texi: Replace http:// with https.

gcc/jit/ChangeLog:

	* docs/_build/texinfo/libgccjit.texi: Replace http:// with https.
	* docs/cp/index.rst: Likewise.
	* docs/cp/intro/index.rst: Likewise.
	* docs/cp/intro/tutorial01.rst: Likewise.
	* docs/cp/intro/tutorial02.rst: Likewise.
	* docs/cp/intro/tutorial03.rst: Likewise.
	* docs/cp/intro/tutorial04.rst: Likewise.
	* docs/cp/topics/asm.rst: Likewise.
	* docs/cp/topics/compilation.rst: Likewise.
	* docs/cp/topics/contexts.rst: Likewise.
	* docs/cp/topics/expressions.rst: Likewise.
	* docs/cp/topics/functions.rst: Likewise.
	* docs/cp/topics/index.rst: Likewise.
	* docs/cp/topics/locations.rst: Likewise.
	* docs/cp/topics/objects.rst: Likewise.
	* docs/cp/topics/types.rst: Likewise.
	* docs/index.rst: Likewise.
	* docs/internals/index.rst: Likewise.
	* docs/intro/index.rst: Likewise.
	* docs/intro/tutorial01.rst: Likewise.
	* docs/intro/tutorial02.rst: Likewise.
	* docs/intro/tutorial03.rst: Likewise.
	* docs/intro/tutorial04.rst: Likewise.
	* docs/intro/tutorial05.rst: Likewise.
	* docs/topics/asm.rst: Likewise.
	* docs/topics/compatibility.rst: Likewise.
	* docs/topics/compilation.rst: Likewise.
	* docs/topics/contexts.rst: Likewise.
	* docs/topics/expressions.rst: Likewise.
	* docs/topics/function-pointers.rst: Likewise.
	* docs/topics/functions.rst: Likewise.
	* docs/topics/index.rst: Likewise.
	* docs/topics/locations.rst: Likewise.
	* docs/topics/objects.rst: Likewise.
	* docs/topics/performance.rst: Likewise.
	* docs/topics/types.rst: Likewise.

register_operand predicate allows not just REGs, but also SUBREGs of REGs,
and for the latter lowpart_subreg might FAIL when trying to create paradoxical
SUBREG in some cases.  For the input operand fixed by force_reg on it first,
for the output operand handled by always dividing into a fresh V4SFmode temporary
and emit_move_insn into the destination afterwards, that is also beneficial for
combine.

2021-12-28  Jakub Jelinek  <jakub@redhat.com>

	PR target/103842
	* config/i386/mmx.md (divv2sf3): Use force_reg on op1.  Always perform
	divv4sf3 into a pseudo and emit_move_insn into operands[0].

	* g++.dg/opt/pr103842.C: New test.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/amx-check.h (check_float_tile_register):
	New check function for float to prevent precision loss.
	* gcc.target/i386/amxbf16-dpbf16ps-2.c: Correct the type convert
	and byte offset. Use the new check function.

libgfortran/ChangeLog:

	PR libfortran/98076
	* runtime/string.c (gfc_itoa): Use two args for static_assert().

2021-12-27  John David Anglin  <danglin@gcc.gnu.org>

gcc/ChangeLog:

	* config/pa/pa-protos.h: Delete
	pa_maybe_emit_compare_and_swap_exchange_loop() declaration.
	* config/pa/pa.c (pa_expand_compare_and_swap_loop): Delete.
	(pa_maybe_emit_compare_and_swap_exchange_loop): Delete.
	* config/pa/pa.md (atomic_storeq): Use __sync_lock_test_and_set
	instead of pa_maybe_emit_compare_and_swap_exchange_loop.
	(atomic_storehi, atomic_storesi, atomic_storedi): Likewise.

The r12-6123 fix for SFINAE with p+N and incomplete type also fixed
the analogous issue with p[N].

	PR c++/101239

gcc/testsuite/ChangeLog:

	* g++.dg/template/sfinae32a.C: New test.

In pointer_int_sum when called from a SFINAE context, we need to avoid
calling size_in_bytes_loc on an incomplete pointed-to type since this
latter function isn't SFINAE-enabled and always emits an error on such
input.

	PR c++/103700

gcc/c-family/ChangeLog:

	* c-common.c (pointer_int_sum): When quiet, return
	error_mark_node for an incomplete pointed-to type and don't
	call size_in_bytes_loc.

gcc/testsuite/ChangeLog:

	* g++.dg/template/sfinae32.C: New test.

The 'm' constraint is defined with define_memory_constraint which allows
LRA to convert the operand to the form '(mem (reg X))', where X is a
base register.  To prevent LRA from generating '(mem (reg X))' from a
register:

1. Add a 'BM' constraint which is similar to the 'm' constraint, but
is defined with define_constraint.
2. Add a 'm' mode attribute which is mapped to the 'm' constraint for
general_operand and the 'BM' constraint for x86_64_general_operand.
3. Replace the 'm' constraint on <general_operand> with the '<m>'
constraint.
4. Replace the 'm' constraint on x86_64_general_operand with the 'BM'
constraint.

gcc/

	PR target/103762
	* config/i386/constraints.md (BM): New constraint.
	* config/i386/i386.md (m): New mode attribute.
	Replace the 'm' constraint on <general_operand> with the '<m>'
	constraint.
	Replace the 'm' constraint on x86_64_general_operand with the
	'BM' constraint.

gcc/testsuite/

	* gcc.target/i386/pr103762-1a.c: New test.
	* gcc.target/i386/pr103762-1b.c: Likewise.
	* gcc.target/i386/pr103762-1c.c: Likewise.

2021-12-27  Uroš Bizjak  <ubizjak@gmail.com>

gcc/testsuite/ChangeLog:

	PR target/95046
	* gfortran.dg/extract_recip_1.f: Adjust testcase.

Because riscv32 not support __int128, so skip if -march=rv32*.

gcc/testsuite/ChangeLog:
	* gcc.target/riscv/pr103302.c: skip if -march=rv32*

When applying peephole optimization to transform

	mov imm, %reg0
	mov %reg1, %AX_REG
	imul %reg0

to

	mov imm, %AX_REG
	imul %reg1

disable peephole optimization if reg1 == AX_REG.

gcc/

	PR target/103785
	* config/i386/i386.md: Swap operand order in comments and check
	AX input in any_mul_highpart peepholes.

gcc/testsuite/

	PR target/103785
	* gcc.target/i386/pr103785.c: New test.

libgfortran/ChangeLog:

	PR libfortran/98076
	* runtime/string.c (itoa64, itoa64_pad19): New helper functions.
	(gfc_itoa): On targets with 128-bit integers, call fast
	64-bit functions to avoid many slow divisions.

gcc/testsuite/ChangeLog:

	PR libfortran/98076
	* gfortran.dg/pr98076.f90: New test.

libgfortran/ChangeLog:

	PR libfortran/81986
	PR libfortran/99191

	* libgfortran.h: Remove gfc_xtoa(), adjust gfc_itoa() and
	GFC_ITOA_BUF_SIZE.
	* io/write.c (write_decimal): conversion parameter is always
	gfc_itoa(), so remove it. Protect from overflow.
	(xtoa): Move gfc_xtoa and update its name.
	(xtoa_big): Renamed from ztoa_big for consistency.
	(write_z): Adjust to new function names.
	(write_i, write_integer): Remove last arg of write_decimal.
	* runtime/backtrace.c (error_callback): Comment on the use of
	gfc_itoa().
	* runtime/error.c (gfc_xtoa): Move to io/write.c.
	* runtime/string.c (gfc_itoa): Take an unsigned argument,
	remove the handling of negative values.

Use V4SFmode "DIVPS X,Y" with [y0, y1, 1.0f, 1.0f] as a divisor
to avoid division by zero.

2021-12-24  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	PR target/95046
	PR target/103797
	* config/i386/mmx.md (divv2sf3): New instruction pattern.

gcc/testsuite/ChangeLog:

	PR target/95046
	PR target/103797
	* gcc.target/i386/pr95046-1.c (test_div): Add.
	(dg-options): Add -mno-recip.

As per title.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

gcc/ChangeLog:

	* config/darwin.c (darwin_override_options): Make a comment
	more inclusive.

The current rule was too strict and has not been required since Darwin11.

This relaxes the constraint to allow up to 2^28 alignment for non-common
entities.  Common is still restricted to a maximum aligment of 2^15.

When the host is an older version of Darwin ( earlier that 11 ) then the
existing constraint is still applied.  Note that this is a host constraint
not a target one (so that a compilation on 10.7 targeting 10.6 is allowed
to use a greater alignment than the tools on 10.6 support).  This matches
the behaviour of clang.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

gcc/ChangeLog:

	* config.gcc: Emit L2_MAX_OFILE_ALIGNMENT with suitable
	values for the host.
	* config/darwin.c (darwin_emit_common): Error for alignment
	values > 32768.
	* config/darwin.h (MAX_OFILE_ALIGNMENT): Rework to use the
	configured L2_MAX_OFILE_ALIGNMENT.

gcc/testsuite/ChangeLog:

	* gcc.dg/darwin-aligned-globals.c: New test.
	* gcc.dg/darwin-comm-1.c: New test.
	* gcc.dg/attr-aligned.c: Amend for new alignment values on
	Darwin.
	* gcc.target/i386/pr89261.c: Likewise.

We were checking whether the flag had been set by the user, but not if
it was set to true.  Which means that the check fails in its intent when
the user puts -fno-reorder-and-partition.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

gcc/ChangeLog:

	* config/darwin.c (darwin_override_options): When checking for the
	flag-reorder-and-partition case, also check that it is set on.

There are places that we need to make different codegen depending
on the object format rather than on the arch.  We already have
definitions for ELF, COFF etc. this adds one for MACHO.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

gcc/ChangeLog:

	* config/darwin.h (OBJECT_FORMAT_MACHO): New.

	* gcc.target/i386/smuldi3_highpart.c: Replace long with long long.