A number of tests that depend on weak undefined symbols fail to
require that support, and arrange to skip some targets and add special
options to others on a test-by-test basis.  Fix this by stating the
requirement explicitly, and adding a proc to return any required
options.

Others rely on weak undefined symbols only to test for the
availability of posix_memalign.  Drop that in favor of dg effective
target support for posix_memalign.


for  gcc/ChangeLog

	* doc/sourcebuild.texi (weak_undefined, posix_memalign):
	Document options and effective targets.

for  gcc/testsuite/ChangeLog

	* lib/target-supports.exp (add_options_for_weak_undefined):
	New.
	(check_effective_target_weak_undefined): Use it.
	(check_effective_target_posix_memalign): New.
	* gcc.dg/torture/pr53922.c: Drop skips and custom options in
	favor of effective target requirement and added options for
	weak_undefined symbols.
	* gcc.dg/torture/pr90020.c: Likewise.
	* gcc.dg/addr_equal-1.c: Likewise.
	* gcc.target/aarch64/aapcs64/aapcs64.exp: Likewise, for
	abitest.S-using tests.
	* gcc.dg/torture/pr60092.c: Likewise, but in favor of
	posix_memalign tests.
	* gcc.dg/vect/vect-tail-nomask-1.c: Likewise.

gcc/fortran/
	PR target/103628
	* target-memory.cc (gfc_interpret_float): Return FAIL when
	native_interpret_expr gets a NULL tree.
	* arith.cc (gfc_hollerith2real): Return NULL when
	gfc_interpret_float fails.
	* error.cc (gfc_buffered_p): Define.
	* gfortran.h (gfc_buffered_p): Declare.
	* intrinsic.cc: Add diagnostic.h to include list.
	(do_simplify): Save errorcount and check it at finish.  Report a
	"Cannot simplify expression" error on a bad result if error count
	doesn't change and no other errors buffered.

gcc/testsuite/
	PR target/103628
	* gfortran.dg/assumed_size_refs_2.f90: Check "Cannot simplify
	expression" error.
	* gfortran.dg/unpack_field_1.f90: Likewise.
	* gfortran.dg/pr103628.f90: New.

Co-Authored-By: Tobias Burnus <tobias@codesourcery.com>

Don't cause an error if the symbol is not found.

When building natively as an MSYS2 package, some
executables are borrowing the $(COMPILERS) flags
and --require-defined=HOST_EXTRA_OBJS_SYMBOL is
causing them to fail.

These executables don't need that symbol, so make
it optional such that they don't error out.

The compilers will still look for it (and find it)
with the desired effect of getting UTF-8 support.

	PR/PR108865

gcc/ChangeLog:

	* config/i386/x-mingw32-utf8: Make HOST_EXTRA_OBJS_SYMBOL
	optional.

Signed-off-by: Jonathan Yong <10walls@gmail.com>

Here, we were calling build_reinterpret_cast regardless of whether there was
actually a cast, and that now sets REINTERPRET_CAST_P.  But that
optimization seems dodgy anyway, as it involves NOP_EXPR from one
RECORD_TYPE to another and we try to reserve NOP_EXPR for fundamental types.
And the generated code seems the same, so let's drop it.  And also strip
location wrappers.

	PR c++/105996

gcc/cp/ChangeLog:

	* typeck.cc (build_ptrmemfunc): Drop 0-offset optimization
	and location wrappers.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/constexpr-pmf3.C: New test.

The test gcc.dg/tree-ssa/ssa-fre-100.c fails the
scan-tree-dump-not fre1 "baz" for at least m68k-linux,
pru-elf, and cris-elf according to posts on gcc-testresults.

GCC requires int-size-alignment for a target to see through
the "int *" dereference and perform value-numbering.  See
comments in PR91419 and also the recent patch to
gcc.dg/tree-ssa/pr100359.c.  This is a flaw in gcc rather
than the target, so prefer an xfail rather than skipping
the test.

	* gcc.dg/tree-ssa/ssa-fre-100.c: XFAIL for ! natural_alignment_32.

The test gcc.dg/tree-ssa/pr100359.c fails the "test for
excess errors" for at least m68k-linux, pru-elf, and
cris-elf according to posts on gcc-testresults.  For
cris-elf, the "excess errors" is a failure to link; an
undefined reference to foo, because the code has a call to
an extern function foo, which is not optimized away, and
which is not defined.  I guess it's the same for those other
targets.

From comparative gdb sessions for native x86_64-linux and
cris-elf, I see tree-ssa-sccvn.cc:vn_reference_lookup_3
(called from the "pre" pass) requires int-size-alignment for
a target to see through the "int *" dereference, that the
expression is constant false and subsequently optimize away
the call to foo.  The conclusion is with substantially less
effort available from comments in PR91419.

The point of the test seems only incidental to
optimizing-out the call to foo, judging from the comments in
PR100359, so an alternative is compile it (not link it) for
all targets.  However, I chose to not change the nature of
the test where it passes.

	* gcc.dg/tree-ssa/pr100359.c: Compile-only for ! natural_alignment_32.

The define_insns for the modulo operation currently force the target register
to a distinct reg in preparation for a possible future peephole combining
div/mod. But this can lead to cases of a needless copy being inserted. Fixed
with the following patch.

gcc/
	* config/rs6000/rs6000.md (*mod<mode>3, umod<mode>3): Add
	non-earlyclobber alternative.

gcc/testsuite/
	* gcc.target/powerpc/mod-no_copy.c: New.
	* gcc.target/powerpc/mod-peephole.c: New.

The problem here is after r0-92187-g2ec5deb5c3146c, maybe_lvalue_p would
return false for compound literals which causes non_lvalue_loc not
to wrap the expression with a NON_LVALUE_EXPR unlike before when it
return true as it returns true for all language specific tree codes.

This fixes that oversight and fixes the testcase to have the cast as
a non-lvalue.

Committed to the trunk as obvious after a bootstrap/test on x86_64-linux-gnu.

	PR c/84900

gcc/ChangeLog:

	* fold-const.cc (maybe_lvalue_p): Treat COMPOUND_LITERAL_EXPR
	as a lvalue.

gcc/testsuite/ChangeLog:

	* gcc.dg/compound-literal-cast-lvalue-1.c: New test.

Resolve opaque type handling.  The bug is caused by the compiler
attempting to resolve the meta types of a constant constructor.
It incorrectly attempts to get the type on an enumeration type
(resulting in NulSym) which causes the meta resolver to spin.
Some PHBuild rules (building records need to be copied from P3Build
so that hidden types are resolved in order across the compile.

gcc/m2/ChangeLog:

	PR modula2/109264
	* gm2-compiler/M2Quads.mod (BuildConstFunctionCall): Comment
	out ErrorString in debugging block.
	(BuildConstructorStart): Replace Assert with a call to
	MetaErrorT3.  Import MetaErrorT3.
	* gm2-compiler/PCSymBuild.mod (buildConstFunction): Rename
	local variables.
	(WalkFunctionParam): Remove test for IsEnumeration when
	resolving MIN or MAX parameters.
	* gm2-compiler/PHBuild.bnf (BlockAssert): New procedure.
	(ErrorArrayat): New procedure.
	(Expect): Renamed parameter t to tok.
	(PushQualident): New rule.
	(ConstSetOrQualidentOrFunction): Force AutoOn.
	(TypeDeclaration): Add debugging assert.
	(SimpleType): Add debugging assert.
	(DefaultRecordAttributes): New rule (and bugfix).
	(FieldPragmaExpression): New rule (and bugfix).
	(PragmaConstExpression): New rule (and bugfix).
	(SetOrDesignatorOrFunction): Add debugging assert.
	(Block): Add debugging assert.
	* gm2-gcc/m2expr.cc (m2expr_ConstantExpressionWarning): int
	to bool.
	* gm2-gcc/m2expr.h (m2expr_TreeOverflow): int to bool.
	(m2expr_GetBooleanTrue): Remove.
	(m2expr_GetBooleanFalse): Remove.
	* gm2-gcc/m2options.h (M2Options_SetStatistics): Replace
	int with bool.

gcc/testsuite/ChangeLog:

	PR modula2/109264
	* gm2/iso/extended-opaque/pass/iso-extended-opaque-pass.exp:
	New test.
	* gm2/iso/extended-opaque/pass/stressset.def: New test.
	* gm2/iso/extended-opaque/pass/stressset.mod: New test.
	* gm2/iso/extended-opaque/pass/testset.mod: New test.
	* gm2/projects/iso/small/run/pass/iso-extended-opaque-run-pass.exp:
	New test.
	* gm2/projects/iso/small/run/pass/stressset.def: New test.
	* gm2/projects/iso/small/run/pass/stressset.mod: New test.
	* gm2/projects/iso/small/run/pass/test1.mod: New test.
	* gm2/projects/iso/small/run/pass/testlib.def: New test.
	* gm2/projects/iso/small/run/pass/testlib.mod: New test.
	* gm2/projects/iso/small/run/pass/testset.mod: New test.

Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>

The following avoids picking up dead code left over from folding
during FRE/PRE, effectively undoing propagations.

	PR tree-optimization/107569
	* tree-ssa-sccvn.cc (eliminate_dom_walker::eliminate_stmt):
	Do not push SSA names with zero uses as available leader.
	(process_bb): Likewise.

	* g++.dg/opt/pr107569.C: New testcase.

The recent combining of complex part loads to a complex load missed
to account for non-call EH.

	PR tree-optimization/109262
	* tree-ssa-forwprop.cc (pass_forwprop::execute): When
	combining a piecewise complex load avoid touching loads
	that throw internally.  Use fun, not cfun throughout.

	* g++.dg/torture/pr109262.C: New testcase.

I've noticed a comment typo in tree-vrp.cc and decided to quickly
skim aspell -c on the ranger sources (with quick I on everything that
looked ok or roughly ok).
But not being a native English speaker, I could get stuff wrong.

2023-03-23  Jakub Jelinek  <jakub@redhat.com>

	* value-range.cc (irange::irange_union, irange::intersect): Fix
	comment spelling bugs.
	* gimple-range-trace.cc (range_tracer::do_header): Likewise.
	* gimple-range-trace.h: Likewise.
	* gimple-range-edge.cc: Likewise.
	(gimple_outgoing_range_stmt_p,
	gimple_outgoing_range::switch_edge_range,
	gimple_outgoing_range::edge_range_p): Likewise.
	* gimple-range.cc (gimple_ranger::prefill_stmt_dependencies,
	gimple_ranger::fold_stmt, gimple_ranger::register_transitive_infer,
	assume_query::assume_query, assume_query::calculate_phi): Likewise.
	* gimple-range-edge.h: Likewise.
	* value-range.h (Value_Range::set, Value_Range::lower_bound,
	Value_Range::upper_bound, frange::set_undefined): Likewise.
	* gimple-range-gori.h (range_def_chain::depend, gori_map::m_outgoing,
	gori_compute): Likewise.
	* gimple-range-fold.h (fold_using_range): Likewise.
	* gimple-range-path.cc (path_range_query::compute_ranges_in_phis):
	Likewise.
	* gimple-range-gori.cc (range_def_chain::in_chain_p,
	range_def_chain::dump, gori_map::calculate_gori,
	gori_compute::compute_operand_range_switch,
	gori_compute::logical_combine, gori_compute::refine_using_relation,
	gori_compute::compute_operand1_range, gori_compute::may_recompute_p):
	Likewise.
	* gimple-range.h: Likewise.
	(enable_ranger): Likewise.
	* range-op.h (empty_range_varying): Likewise.
	* value-query.h (value_query): Likewise.
	* gimple-range-cache.cc (block_range_cache::set_bb_range,
	block_range_cache::dump, ssa_global_cache::clear_global_range,
	temporal_cache::temporal_value, temporal_cache::current_p,
	ranger_cache::range_of_def, ranger_cache::propagate_updated_value,
	ranger_cache::range_from_dom, ranger_cache::register_inferred_value):
	Likewise.
	* gimple-range-fold.cc (fur_edge::get_phi_operand,
	fur_stmt::get_operand, gimple_range_adjustment,
	fold_using_range::range_of_phi,
	fold_using_range::relation_fold_and_or): Likewise.
	* value-range-storage.h (irange_storage_slot::MAX_INTS): Likewise.
	* value-query.cc (range_query::value_of_expr,
	range_query::value_on_edge, range_query::query_relation): Likewise.
	* tree-vrp.cc (remove_unreachable::remove_and_update_globals,
	intersect_range_with_nonzero_bits): Likewise.
	* gimple-range-infer.cc (gimple_infer_range::check_assume_func,
	exit_range): Likewise.
	* value-relation.h: Likewise.
	(equiv_oracle, relation_trio::relation_trio, value_relation,
	value_relation::value_relation, pe_min): Likewise.
	* range-op-float.cc (range_operator_float::rv_fold,
	frange_arithmetic, foperator_unordered_equal::op1_range,
	foperator_div::rv_fold): Likewise.
	* gimple-range-op.cc (cfn_clz::fold_range): Likewise.
	* value-relation.cc (equiv_oracle::query_relation,
	equiv_oracle::register_equiv, equiv_oracle::add_equiv_to_block,
	value_relation::apply_transitive, relation_chain_head::find_relation,
	dom_oracle::query_relation, dom_oracle::find_relation_block,
	dom_oracle::find_relation_dom, path_oracle::register_equiv): Likewise.
	* range-op.cc (range_operator::wi_fold_in_parts_equiv,
	create_possibly_reversed_range, adjust_op1_for_overflow,
	operator_mult::wi_fold, operator_exact_divide::op1_range,
	operator_cast::lhs_op1_relation, operator_cast::fold_pair,
	operator_cast::fold_range, operator_abs::wi_fold, range_op_cast_tests,
	range_op_lshift_tests): Likewise.

gcc/testsuite/
	* gnat.dg/div_zero.adb: Skip for aarch64*-*-* targets.

Based on <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107532#c24>,
it seems like we should treat *any* class with a reference member
as a reference wrapper.  To suppress the warning in

  int i = 42;
  auto const& v = std::get<0>(std::tuple<int&>(i));

we have to look into base classes as well.  For std::tuple, this means
that we have to check the _Head_base subobject, which is a non-direct
base class of std::tuple.  So I've employed a DFS walk.

	PR c++/107532

gcc/cp/ChangeLog:

	* call.cc (class_has_reference_member_p): New.
	(class_has_reference_member_p_r): New.
	(reference_like_class_p): Don't look for a specific constructor.
	Use a DFS walk with class_has_reference_member_p_r.

gcc/testsuite/ChangeLog:

	* g++.dg/warn/Wdangling-reference11.C: New test.
	* g++.dg/warn/Wdangling-reference12.C: New test.

Fix an issue in which "vectors" of duplicate entries placed in scalar
registers caused the following 63 registers to be marked live, for the
purpose of prologue generation, which resulted in stack corruption.

gcc/ChangeLog:

	* config/gcn/gcn.cc (gcn_class_max_nregs): Handle vectors in SGPRs.
	(move_callee_saved_registers): Detect the bug condition early.

Just using move insn for no-op conversions triggers special move handling in
IRA which declares that subreg of vectors aren't valid and routes everything
through memory.  These patterns make the vec_select explicit and all is well.

gcc/ChangeLog:

	* config/gcn/gcn-protos.h (gcn_stepped_zero_int_parallel_p): New.
	* config/gcn/gcn-valu.md (V_1REG_ALT): New.
	(V_2REG_ALT): New.
	(vec_extract<V_1REG:mode><V_1REG_ALT:mode>_nop): New.
	(vec_extract<V_2REG:mode><V_2REG_ALT:mode>_nop): New.
	(vec_extract<V_ALL:mode><V_ALL_ALT:mode>): Use new patterns.
	* config/gcn/gcn.cc (gcn_stepped_zero_int_parallel_p): New.
	* config/gcn/predicates.md (ascending_zero_int_parallel): New.

The following testcase ICEs on aarch64-linux, because
expand_vector_condition attempts to piecewise lower SVE
  d_3 = a_1(D) < b_2(D);
  _5 = VEC_COND_EXPR <d_3, c_4(D), d_3>;
which isn't possible - nunits_for_known_piecewise_op ICEs but
the rest of the code assumes constant number of elements too.

expand_vector_condition attempts to find if a (rhs1) is a SSA_NAME
for comparison and calls expand_vec_cond_expr_p (type, TREE_TYPE (a1), code)
where a1 is one of the operands of the comparison and code is the comparison
code.  That one indeed isn't supported here, but what aarch64 SVE supports
are the individual statements, comparison (expand_vec_cmp_expr_p) and
expand_vec_cond_expr_p (type, TREE_TYPE (a), SSA_NAME), the latter because
that function starts with
  if (VECTOR_BOOLEAN_TYPE_P (cmp_op_type)
      && get_vcond_mask_icode (TYPE_MODE (value_type),
                               TYPE_MODE (cmp_op_type)) != CODE_FOR_nothing)
    return true;

In an earlier version of the patch (in the PR), we did this
  if (VECTOR_BOOLEAN_TYPE_P (TREE_TYPE (a))
      && expand_vec_cond_expr_p (type, TREE_TYPE (a), ERROR_MARK))
    return true;
before the code == SSA_NAME handling plus some further tweaks later.
While that fixed the ICE, it broke quite a few tests on x86 and some on
aarch64 too.  The problem is that expand_vector_comparison doesn't lower
comparisons which aren't supported and only feed VEC_COND_EXPR first operand
and expand_vector_condition succeeds for those, so with the above mentioned
change we'd verify the VEC_COND_EXPR is implementable using optab alone,
but nothing would verify the tcc_comparison which relied on
expand_vector_condition to verify.

So, the following patch instead queries whether optabs can handle the
comparison and VEC_COND_EXPR together (if a (rhs1) is a comparison;
otherwise as before it checks only the VEC_COND_EXPR) and if that fails,
also checks whether the two operations could be supported individually
and only if even that fails does the piecewise lowering.

2023-03-23  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/109176
	* tree-vect-generic.cc (expand_vector_condition): If a has
	vector boolean type and is a comparison, also check if both
	the comparison and VEC_COND_EXPR could be successfully expanded
	individually.

	* gcc.target/aarch64/sve/pr109176.c: New test.

Fix the bug of the rvv bool mode size by the adjustment.
Besides the mode precision (aka bit size [1, 2, 4, 8, 16, 32, 64])
of the vbool*_t, the mode size (aka byte size) will be adjusted to
[1, 1, 1, 1, 2, 4, 8] according to the rvv spec 1.0 isa. The
adjustment will provide correct information for the underlying
redundant instruction elimiation.

Given the below sample code:
{
  vbool1_t v1 = *(vbool1_t*)in;
  vbool64_t v2 = *(vbool64_t*)in;

  *(vbool1_t*)(out + 100) = v1;
  *(vbool64_t*)(out + 200) = v2;
}

Before the size adjustment:
csrr    t0,vlenb
slli    t1,t0,1
csrr    a3,vlenb
sub     sp,sp,t1
slli    a4,a3,1
add     a4,a4,sp
addi    a2,a1,100
vsetvli a5,zero,e8,m8,ta,ma
sub     a3,a4,a3
vlm.v   v24,0(a0)
vsm.v   v24,0(a2)
vsm.v   v24,0(a3)
addi    a1,a1,200
csrr    t0,vlenb
vsetvli a4,zero,e8,mf8,ta,ma
slli    t1,t0,1
vlm.v   v24,0(a3)
vsm.v   v24,0(a1)
add     sp,sp,t1
jr      ra

After the size adjustment:
addi    a3,a1,100
vsetvli a4,zero,e8,m8,ta,ma
addi    a1,a1,200
vlm.v   v24,0(a0)
vsm.v   v24,0(a3)
vsetvli a5,zero,e8,mf8,ta,ma
vlm.v   v24,0(a0)
vsm.v   v24,0(a1)
ret

Additionally, the size adjust cannot cover all possible combinations
of the vbool*_t code pattern like above. We will take a look into it
in another patches.

PR 108185
PR 108654

gcc/ChangeLog:

	PR target/108654
	PR target/108185
	* config/riscv/riscv-modes.def (ADJUST_BYTESIZE): Adjust size
	for vector mask modes.
	* config/riscv/riscv.cc (riscv_v_adjust_bytesize): New.
	* config/riscv/riscv.h (riscv_v_adjust_bytesize): New.

gcc/testsuite/ChangeLog:

	PR target/108654
	PR target/108185
	* gcc.target/riscv/rvv/base/pr108185-1.c: Update.
	* gcc.target/riscv/rvv/base/pr108185-2.c: Ditto.
	* gcc.target/riscv/rvv/base/pr108185-3.c: Ditto.

Signed-off-by: Pan Li <pan2.li@intel.com>
Co-authored-by: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>

The arch 'rv32imac' will not be created when excuting
'./multilib-generator rv32imc-ilp32--a'

The output is:
MULTILIB_OPTIONS = march=rv32imc mabi=ilp32
MULTILIB_DIRNAMES = rv32imc ilp32
MULTILIB_REQUIRED = march=rv32imc/mabi=ilp32
MULTILIB_REUSE =

Analysis : The alts:['rv32imc', 'rv32imac'] will change
to ['rv32imac', 'rv32imc'] through function:unique(alts) processing,
This is the wrong alts should not be changed.
This patch fix it.

gcc/ChangLog:
	* config/riscv/multilib-generator: Adjusting the loop of 'alt' in 'alts'.

Signed-off-by: Songhe Zhu <zhusonghe@eswincomputing.com>

In this testcase, the tree walk to look for bare parameter packs was
confused by finding a type with no TREE_BINFO.  But it should be fine that
it's unset; we already checked for unexpanded packs at parse time.

I also tried doing the partial instantiation of the local class, which is
probably the long-term direction we want to go, but for stage 4 let's go
with this safer change.

	PR c++/109241

gcc/cp/ChangeLog:

	* pt.cc (find_parameter_packs_r): Handle null TREE_BINFO.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp1y/lambda-generic-local-class2.C: New test.

In order to decrease the memory traffic, we don't use whole register
load/store for the LMUL less than 1 and mask mode, so those case will
require one extra general purpose register for setting up VL register,
but it's not allowed during LRA process, so we defined few special move patterns
used for LRA, which will defer the expansion after LRA.

gcc/ChangeLog:

	PR target/109244
	* config/riscv/riscv-protos.h (emit_vlmax_vsetvl): Define as global.
	(emit_vlmax_op): Ditto.
	* config/riscv/riscv-v.cc (get_sew): New function.
	(emit_vlmax_vsetvl): Adapt function.
	(emit_pred_op): Ditto.
	(emit_vlmax_op): Ditto.
	(emit_nonvlmax_op): Ditto.
	(legitimize_move): Fix LRA ICE.
	(gen_no_side_effects_vsetvl_rtx): Adapt function.
	* config/riscv/vector.md (@mov<V_FRACT:mode><P:mode>_lra): New pattern.
	(@mov<VB:mode><P:mode>_lra): Ditto.
	(*mov<V_FRACT:mode><P:mode>_lra): Ditto.
	(*mov<VB:mode><P:mode>_lra): Ditto.

gcc/testsuite/ChangeLog:

	PR target/109244
	* g++.target/riscv/rvv/base/pr109244.C: New test.
	* gcc.target/riscv/rvv/base/binop_vv_constraint-4.c: Adapt testcase.
	* gcc.target/riscv/rvv/base/binop_vv_constraint-6.c: Ditto.
	* gcc.target/riscv/rvv/base/binop_vx_constraint-127.c: Ditto.
	* gcc.target/riscv/rvv/base/spill-1.c: Ditto.
	* gcc.target/riscv/rvv/base/spill-2.c: Ditto.
	* gcc.target/riscv/rvv/base/spill-3.c: Ditto.
	* gcc.target/riscv/rvv/base/spill-5.c: Ditto.
	* gcc.target/riscv/rvv/base/spill-7.c: Ditto.
	* g++.target/riscv/rvv/base/bug-18.C: New test.
	* gcc.target/riscv/rvv/base/merge_constraint-3.c: New test.
	* gcc.target/riscv/rvv/base/merge_constraint-4.c: New test.

__riscv_vlenb is defined in RVV intrinsic spec 0.11 and used in some project
like google/highway.

gcc/ChangeLog:

	PR target/109228
	* config/riscv/riscv-vector-builtins-bases.cc (class vlenb): Add
	__riscv_vlenb support.
	(BASE): Ditto.
	* config/riscv/riscv-vector-builtins-bases.h: Ditto.
	* config/riscv/riscv-vector-builtins-functions.def (vlenb): Ditto.
	* config/riscv/riscv-vector-builtins-shapes.cc (struct vlenb_def): Ditto.
	(SHAPE): Ditto.
	* config/riscv/riscv-vector-builtins-shapes.h: Ditto.
	* config/riscv/riscv-vector-builtins.cc: Ditto.

gcc/testsuite/ChangeLog:

	PR target/109228
	* gcc.target/riscv/rvv/base/vlenb-1.c: New test.

gcc/ChangeLog:

	* config/riscv/riscv-vsetvl.cc (reg_available_p): Fix bugs.
	(pass_vsetvl::compute_local_backward_infos): Fix bugs.
	(pass_vsetvl::need_vsetvl): Fix bugs.
	(pass_vsetvl::backward_demand_fusion): Fix bugs.
	(pass_vsetvl::demand_fusion): Fix bugs.
	(eliminate_insn): Fix bugs.
	(insert_vsetvl): Ditto.
	(pass_vsetvl::emit_local_forward_vsetvls): Ditto.
	* config/riscv/riscv-vsetvl.h (enum vsetvl_type): Ditto.
	* config/riscv/vector.md: Ditto.

gcc/testsuite/ChangeLog:

	* g++.target/riscv/rvv/base/bug-10.C: New test.
	* g++.target/riscv/rvv/base/bug-11.C: New test.
	* g++.target/riscv/rvv/base/bug-12.C: New test.
	* g++.target/riscv/rvv/base/bug-13.C: New test.
	* g++.target/riscv/rvv/base/bug-14.C: New test.
	* g++.target/riscv/rvv/base/bug-15.C: New test.
	* g++.target/riscv/rvv/base/bug-16.C: New test.
	* g++.target/riscv/rvv/base/bug-17.C: New test.
	* g++.target/riscv/rvv/base/bug-2.C: New test.
	* g++.target/riscv/rvv/base/bug-3.C: New test.
	* g++.target/riscv/rvv/base/bug-4.C: New test.
	* g++.target/riscv/rvv/base/bug-5.C: New test.
	* g++.target/riscv/rvv/base/bug-6.C: New test.
	* g++.target/riscv/rvv/base/bug-7.C: New test.
	* g++.target/riscv/rvv/base/bug-8.C: New test.
	* g++.target/riscv/rvv/base/bug-9.C: New test.

Signed-off-by: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>
Co-authored-by: kito-cheng <kito.cheng@sifive.com>

We've wrong RTL pattern cause unexpected optimizaion result.

Give a example is vnmsub.vx pattern, the operation of vnmsub.vx
list below:

  vnmsub.vx vd, rs1, vs2, vm    # vd[i] = -(x[rs1] * vd[i]) + vs2[i]

But our RTL pattern write as (x[rs1] * vd[i]) - vs2[i], and the GCC try to
simplify when x[rs1] is constant 1, and then become a vd[i] - vs[i]
instruction.

We also revise all ternary instructions to make sure the RTL has right
semantic:

And it's the mapping list between instruction and RTL pattern:

interger:
vnmsac.vv vd, vs1, vs2, vm    # vd[i] = -(vs1[i] * vs2[i]) + vd[i]  (minus op3 (mult op1 op2))
vnmsac.vx vd, rs1, vs2, vm    # vd[i] = -(x[rs1] * vs2[i]) + vd[i]   (minus op3 (mult op1 op2))

floating-point:
vfmacc.vv vd, vs1, vs2, vm    # vd[i] = +(vs1[i] * vs2[i]) + vd[i] (plus (mult (op1 op2)) op3)
vfmacc.vf vd, rs1, vs2, vm    # vd[i] = +(f[rs1] * vs2[i]) + vd[i] (plus (mult (op1 op2)) op3)

vfnmacc.vv vd, vs1, vs2, vm   # vd[i] = -(vs1[i] * vs2[i]) - vd[i] (minus (neg (mult (op1 op2))) op3))
vfnmacc.vf vd, rs1, vs2, vm   # vd[i] = -(f[rs1] * vs2[i]) - vd[i] (minus (neg (mult (op1 op2)) op3))
vfmsac.vv vd, vs1, vs2, vm    # vd[i] = +(vs1[i] * vs2[i]) - vd[i] (minus (mult (op1 op2)) op3)
vfmsac.vf vd, rs1, vs2, vm    # vd[i] = +(f[rs1] * vs2[i]) - vd[i] (minus (mult (op1 op2)) op3)

vfnmsac.vv vd, vs1, vs2, vm   # vd[i] = -(vs1[i] * vs2[i]) + vd[i] (plus (neg:(mult (op1 op2))) op3)
vfnmsac.vf vd, rs1, vs2, vm   # vd[i] = -(f[rs1] * vs2[i]) + vd[i] (plus (neg:(mult (op1 op2))) op3)

gcc/ChangeLog:

	* config/riscv/riscv-vector-builtins-bases.cc: Fix ternary bug.
	* config/riscv/vector-iterators.md (nmsac): Ditto.
	(nmsub): Ditto.
	(msac): Ditto.
	(msub): Ditto.
	(nmadd): Ditto.
	(nmacc): Ditto.
	* config/riscv/vector.md (@pred_mul_<optab><mode>): Ditto.
	(@pred_mul_plus<mode>): Ditto.
	(*pred_madd<mode>): Ditto.
	(*pred_macc<mode>): Ditto.
	(*pred_mul_plus<mode>): Ditto.
	(@pred_mul_plus<mode>_scalar): Ditto.
	(*pred_madd<mode>_scalar): Ditto.
	(*pred_macc<mode>_scalar): Ditto.
	(*pred_mul_plus<mode>_scalar): Ditto.
	(*pred_madd<mode>_extended_scalar): Ditto.
	(*pred_macc<mode>_extended_scalar): Ditto.
	(*pred_mul_plus<mode>_extended_scalar): Ditto.
	(@pred_minus_mul<mode>): Ditto.
	(*pred_<madd_nmsub><mode>): Ditto.
	(*pred_nmsub<mode>): Ditto.
	(*pred_<macc_nmsac><mode>): Ditto.
	(*pred_nmsac<mode>): Ditto.
	(*pred_mul_<optab><mode>): Ditto.
	(*pred_minus_mul<mode>): Ditto.
	(@pred_mul_<optab><mode>_scalar): Ditto.
	(@pred_minus_mul<mode>_scalar): Ditto.
	(*pred_<madd_nmsub><mode>_scalar): Ditto.
	(*pred_nmsub<mode>_scalar): Ditto.
	(*pred_<macc_nmsac><mode>_scalar): Ditto.
	(*pred_nmsac<mode>_scalar): Ditto.
	(*pred_mul_<optab><mode>_scalar): Ditto.
	(*pred_minus_mul<mode>_scalar): Ditto.
	(*pred_<madd_nmsub><mode>_extended_scalar): Ditto.
	(*pred_nmsub<mode>_extended_scalar): Ditto.
	(*pred_<macc_nmsac><mode>_extended_scalar): Ditto.
	(*pred_nmsac<mode>_extended_scalar): Ditto.
	(*pred_mul_<optab><mode>_extended_scalar): Ditto.
	(*pred_minus_mul<mode>_extended_scalar): Ditto.
	(*pred_<madd_msub><mode>): Ditto.
	(*pred_<macc_msac><mode>): Ditto.
	(*pred_<madd_msub><mode>_scalar): Ditto.
	(*pred_<macc_msac><mode>_scalar): Ditto.
	(@pred_neg_mul_<optab><mode>): Ditto.
	(@pred_mul_neg_<optab><mode>): Ditto.
	(*pred_<nmadd_msub><mode>): Ditto.
	(*pred_<nmsub_nmadd><mode>): Ditto.
	(*pred_<nmacc_msac><mode>): Ditto.
	(*pred_<nmsac_nmacc><mode>): Ditto.
	(*pred_neg_mul_<optab><mode>): Ditto.
	(*pred_mul_neg_<optab><mode>): Ditto.
	(@pred_neg_mul_<optab><mode>_scalar): Ditto.
	(@pred_mul_neg_<optab><mode>_scalar): Ditto.
	(*pred_<nmadd_msub><mode>_scalar): Ditto.
	(*pred_<nmsub_nmadd><mode>_scalar): Ditto.
	(*pred_<nmacc_msac><mode>_scalar): Ditto.
	(*pred_<nmsac_nmacc><mode>_scalar): Ditto.
	(*pred_neg_mul_<optab><mode>_scalar): Ditto.
	(*pred_mul_neg_<optab><mode>_scalar): Ditto.
	(@pred_widen_neg_mul_<optab><mode>): Ditto.
	(@pred_widen_mul_neg_<optab><mode>): Ditto.
	(@pred_widen_neg_mul_<optab><mode>_scalar): Ditto.
	(@pred_widen_mul_neg_<optab><mode>_scalar): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/base/bug-3.c: New test.
	* gcc.target/riscv/rvv/base/bug-4.c: New test.
	* gcc.target/riscv/rvv/base/bug-5.c: New test.

Signed-off-by: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>
Co-authored-by: kito-cheng <kito.cheng@sifive.com>

Add target check funciton to ensure vector extension can be used.

gcc/testsuite/ChangeLog:

	* lib/target-supports.exp (check_effective_target_riscv_vector):
	New.

The target hook is only used by i386, and the current definition is
same as default gen_reg_rtx.

gcc/ChangeLog:

	* builtins.cc (builtin_memset_read_str): Replace
	targetm.gen_memset_scratch_rtx with gen_reg_rtx.
	(builtin_memset_gen_str): Ditto.
	* config/i386/i386-expand.cc
	(ix86_convert_const_wide_int_to_broadcast): Replace
	ix86_gen_scratch_sse_rtx with gen_reg_rtx.
	(ix86_expand_vector_move): Ditto.
	* config/i386/i386-protos.h (ix86_gen_scratch_sse_rtx):
	Removed.
	* config/i386/i386.cc (ix86_gen_scratch_sse_rtx): Removed.
	(TARGET_GEN_MEMSET_SCRATCH_RTX): Removed.
	* doc/tm.texi: Remove TARGET_GEN_MEMSET_SCRATCH_RTX.
	* doc/tm.texi.in: Ditto.
	* target.def: Ditto.

LWG voted this to Tentatively Ready recently.

libstdc++-v3/ChangeLog:

	* include/bits/shared_ptr_atomic.h (atomic::operator=(nullptr_t)):
	Add overload, as per LWG 3893.
	* testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc:
	Check assignment from nullptr.

c-c++-common/diagnostic-format-sarif-file-4.c is a test case for
quoting non-ASCII source code in a SARIF diagnostic log.

The SARIF standard mandates that .sarif files are UTF-8 encoded.

PR testsuite/105959 notes that the test case fails when the system
encoding is not UTF-8, such as when the "make" invocation is prefixed
with LC_ALL=C, whereas it works with in a UTF-8-locale.

The root cause is that dg-scan opens the file for reading using the
"system" encoding; I believe it is falling back to treating all files as
effectively ISO 8859-1 in a non-UTF-8 locale.

This patch fixes things by adding a mechanism to dg-scan to allow
callers to (optionally) specify an encoding to use when reading the
file, and updating scan-sarif-file (and the -not variant) to always
use UTF-8 when calling dg-scan, fixing the test case with LC_ALL=C.

gcc/testsuite/ChangeLog:
	PR testsuite/105959
	* gcc.dg-selftests/dg-final.exp
	(dg_final_directive_check_num_args): Update expected maximum
	number of args for the various directives using dg-scan.
	* lib/scanasm.exp (append_encoding_arg): New procedure.
	(dg-scan): Add optional 3rd argument: the encoding to use when
	reading from the file.
	* lib/scansarif.exp (scan-sarif-file): Treat the file as UTF-8
	encoded when reading it.
	(scan-sarif-file-not): Likewise.

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

Fixes golang/go#59169

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/478176

fold_convert doesn't work with a dependent argument, and problematically
differed from the corresponding fold+build_nop further down in the
function.  So change it to match.

	PR c++/108390

gcc/cp/ChangeLog:

	* pt.cc (unify): Use fold of build_nop instead of fold_convert.

gcc/testsuite/ChangeLog:

	* g++.dg/template/partial-order3.C: New test.

gcc/fortran/ChangeLog:

	PR fortran/104572
	* resolve.cc (gfc_resolve_finalizers): Argument of a FINAL subroutine
	cannot be an alternate return.

gcc/testsuite/ChangeLog:

	PR fortran/104572
	* gfortran.dg/pr104572.f90: New test.

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

This was approved in Issaquah as LWG 3833.

libstdc++-v3/ChangeLog:

	* include/std/format (formatter<const charT[N], charT>): Do not
	define partial speclialization, as per LWG 3833.
	* testsuite/std/format/formatter/requirements.cc: Check it.

We actually defined this macro in <utility> at one point, but I removed
it in r10-7901-g2025db692e9ed1.

libstdc++-v3/ChangeLog:

	* include/std/utility (__cpp_lib_constexpr_algorithms): Define,
	as per LWG 3792.
	* testsuite/20_util/exchange/constexpr.cc: Check for it.

libstdc++-v3/ChangeLog:

	* include/std/version (__cpp_lib_format): Define.
	* testsuite/std/format/functions/format.cc: Check it.

Previously the C++23 draft required that the callback arguments were
lvalues, which was overvable by the callback. LWG 3645 removes that
overspecification, so we can pass rvalues and the user can't modify
our local variables. I've used auto(p) to produce rvalues, which is only
supported since Clang 15, but I think that's OK for a C++23 feature.

While making this change I noticed that we weren't correctly enforcing
the requirement that the callback returns an integer-like type. Add
better assertions for the type and value.

libstdc++-v3/ChangeLog:

	* include/bits/basic_string.tcc (basic_string::resize_and_overwrite):
	Pass rvalues to the callback, as now allowed by LWG 3645.
	Enforce preconditions on the return value.
	* testsuite/21_strings/basic_string/capacity/char/resize_and_overwrite.cc:
	Adjust.

libstdc++-v3/ChangeLog:

	* include/std/format: Add a comment noting that the resolution
	of LWG 3720 has been applied..

This was approved in Issaquah last month.

libstdc++-v3/ChangeLog:

	* include/bits/regex.h (match_results): Add allocator-extended
	copy and move constructors, as per LWG 2195.
	* testsuite/28_regex/match_results/ctors/char/alloc.cc: New test.

As explained in LWG 3600, we never implemented a C++0x change that made
the copy constructor of std::istream_iterator defined as defaulted. That
would be an ABI break, so the resolution of LWG 3600 is to not require
it to be trivial, but just constexpr and conditionally noexcept. This
applies that resolution.

libstdc++-v3/ChangeLog:

	* include/bits/stream_iterator.h (istream_iterator): Add
	constexpr to copy constructor, as per LWG 3600.
	* testsuite/24_iterators/istream_iterator/cons/constexpr.cc:
	Check copy construction.