This adds support for declaring (class-scope) deduction guides for a
member class template. Fortunately it seems only a couple of changes
are needed in order for the existing CTAD machinery to handle them
properly: we need to make sure to give them a FUNCTION_TYPE instead of a
METHOD_TYPE, and we need to avoid using a BASELINK when looking them up.
PR c++/79501
PR c++/100983
gcc/cp/ChangeLog:
* decl.c (grokfndecl): Don't require that deduction guides are
declared at namespace scope. Check that class-scope deduction
guides have the same access as the member class template.
(grokdeclarator): Pretend class-scope deduction guides are static.
* search.c (lookup_member): Don't use a BASELINK for (class-scope)
deduction guides.
gcc/testsuite/ChangeLog:
* g++.dg/cpp1z/class-deduction92.C: New test.
* g++.dg/cpp1z/class-deduction93.C: New test.
* g++.dg/cpp1z/class-deduction94.C: New test.
* g++.dg/cpp1z/class-deduction95.C: New test.
AVX does not support 32-byte integer compares, required by
ix86_expand_vector_set_var. The following patch fixes vec_set<mode>
expanders by introducing new vec_setm_avx2_operand predicate for AVX
vector modes.
gcc/
2021-07-12 Uroš Bizjak <ubizjak@gmail.com>
PR target/101424
* config/i386/predicates.md (vec_setm_sse41_operand):
Rename from vec_setm_operand.
(vec_setm_avx2_operand): New predicate.
* config/i386/sse.md (vec_set<V_128:mode>): Use V_128 mode iterator.
Use vec_setm_sse41_operand as operand 2 predicate.
(vec_set<V_256_512:mode): New expander.
* config/i386/mmx.md (vec_setv2hi): Use vec_setm_sse41_operand
as operand 2 predicate.
gcc/testsuite/
2021-07-12 Uroš Bizjak <ubizjak@gmail.com>
PR target/101424
* gcc.target/i386/pr101424.c: New test.
Registering an equivalence between objects of the same size in a cast can
cause other relations to be incorrect.
gcc/
PR tree-optimization/101335
* range-op.cc (operator_cast::lhs_op1_relation): Delete.
gcc/testsuite/
* gcc.dg/tree-ssa/pr101335.c: New.
The std::as_writable_bytes function should be constrained to only accept
writable spans. Currently it can be called but then gives an error in
the function body.
Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:
PR libstdc++/101411
* include/std/span (as_writable_bytes): Add requires-clause.
* testsuite/23_containers/span/101411.cc: New test.
Instead of waiting for DCE to remove the unused statement,
and maybe optimize another conditional, it is better if
we don't move the statement and have the statement
removed.
OK? Bootstrapped and tested on x86_64-linux-gnu.
Changes from v1:
* v2: Change the order of insertation and check to see if the lhs
is used rather than see if the lhs was used in the sequence.
gcc/ChangeLog:
* tree-ssa-phiopt.c (match_simplify_replacement): Move
insert of the sequence before the movement of the
statement. Check if to see if the statement is used
outside of the original phi to see if we should move it.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/pr96928-1.c: Update to similar as pr96928.c.
This adds a dot_slp_tree debug function producing a simple DOT
graph from a starting node down the graph. There's no fancy
direct invocation of dot but the output is directed to a specified
file. It re-uses vect_print_slp_tree, naming nodes as their
address.
2021-07-12 Richard Biener <rguenther@suse.de>
* dump-context.h (debug_dump_context::debug_dump_context):
Add FILE * parameter defaulted to stderr.
* dumpfile.c (debug_dump_context::debug_dump_context): Adjust.
* tree-vect-slp.c (dot_slp_tree): New functions.
PRE already tries to avoid hoisting possibly trapping expressions
across calls that might not return normally but fails to consider
const calls that throw externally. The following fixes that and
also plugs the hole of trapping references not pruned in case
they are not catched by the actuall call clobbering it.
At -Os we hit the same issue in RTL PRE and postreload-gcse has
even more incomplete checks so the patch adjusts both of those
as well.
2021-07-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/101373
* tree-ssa-pre.c (prune_clobbered_mems): Also prune trapping
references when the BB may not return.
(compute_avail): Pass in the function we're working on and
replace cfun references with it. Externally throwing
const calls also possibly terminate the function.
(pass_pre::execute): Pass down the function we're working on.
* gcse.c (compute_hash_table_work): Externally throwing
const/pure calls also need record_last_mem_set_info.
* postreload-gcse.c (record_opr_changes): Looping or externally
throwing const/pure calls also need record_last_mem_set_info.
* g++.dg/torture/pr101373.C: New testcase, XFAILed.
* gnat.dg/opt95.adb: Likewise.
2021-07-12 Uroš Bizjak <ubizjak@gmail.com>
gcc/
* recog.c (memory_address_addr_space_p): Change the type to bool.
Return true/false instead of 1/0.
(offsettable_memref_p): Ditto.
(offsettable_nonstrict_memref_p): Ditto.
(offsettable_address_addr_space_p): Ditto.
Change the type of addressp indirect function to bool.
* recog.h (memory_address_addr_space_p): Change the type to bool.
(strict_memory_address_addr_space_p): Ditto.
(offsettable_memref_p): Ditto.
(offsettable_nonstrict_memref_p): Ditto.
(offsettable_address_addr_space_p): Ditto.
* reload.c (maybe_memory_address_addr_space_p): Ditto.
(strict_memory_address_addr_space_p): Change the type to bool.
Return true/false instead of 1/0.
(maybe_memory_address_addr_space_p): Change the type to bool.
gcc/ada/
* gcc-interface/decl.c (gnat_to_gnu_entity) <discrete_type>: Add a
parallel type only when -fgnat-encodings=all is specified.
<E_Array_Type>: Use the PAT name and special suffixes only when
-fgnat-encodings=all is specified.
<E_Array_Subtype>: Build a special type for debugging purposes only
when -fgnat-encodings=all is specified. Add a parallel type or use
the PAT name only when -fgnat-encodings=all is specified.
<E_Record_Type>: Generate debug info for the inner record types only
when -fgnat-encodings=all is specified.
<E_Record_Subtype>: Use a debug type for an artificial subtype only
except when -fgnat-encodings=all is specified.
(elaborate_expression_1): Reset need_for_debug when possible only
except when -fgnat-encodings=all is specified.
(components_to_record): Use XV encodings for variable size only
when -fgnat-encodings=all is specified.
(associate_original_type_to_packed_array): Add a parallel type only
when -fgnat-encodings=all is specified.
* gcc-interface/misc.c (gnat_get_array_descr_info): Do not return
full information only when -fgnat-encodings=all is specified.
* gcc-interface/utils.c (make_packable_type): Add a parallel type
only when -fgnat-encodings=all is specified.
(maybe_pad_type): Make the inner type a debug type only except when
-fgnat-encodings=all is specified. Create an XVS type for variable
size only when -fgnat-encodings=all is specified.
(rest_of_record_type_compilation): Add a parallel type only when
-fgnat-encodings=all is specified.
gcc/ada/
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Array_Type>: Use a
fixed lower bound if the index subtype is marked so, as well as a
more efficient formula for the upper bound if the array cannot be
superflat.
(flb_cannot_be_superflat): New predicate.
(cannot_be_superflat): Rename into...
(range_cannot_be_superfla): ...this. Minor tweak.
gcc/ada/
* uintp.ads, types.h: New subtypes of Uint: Valid_Uint, Unat,
Upos, Nonzero_Uint with predicates. These correspond to new
field types in Gen_IL.
* gen_il-types.ads (Valid_Uint, Unat, Upos, Nonzero_Uint): New
field types.
* einfo-utils.ads, einfo-utils.adb, fe.h (Known_Alignment,
Init_Alignment): Use the initial zero value to represent
"unknown". This will ensure that if Alignment is called before
Set_Alignment, the compiler will blow up (if assertions are
enabled).
* atree.ads, atree.adb, atree.h, gen_il-gen.adb
(Get_Valid_32_Bit_Field): New generic low-level getter for
subtypes of Uint.
(Copy_Alignment): New procedure to copy Alignment field even
when Unknown.
(Init_Object_Size_Align, Init_Size_Align): Do not bypass the
Init_ procedures.
* exp_pakd.adb, freeze.adb, layout.adb, repinfo.adb,
sem_util.adb: Protect calls to Alignment with Known_Alignment.
Use Copy_Alignment when it might be unknown.
* gen_il-gen-gen_entities.adb (Alignment,
String_Literal_Length): Use type Unat instead of Uint, to ensure
that the field is always Set_ before we get it, and that it is
set to a nonnegative value.
(Enumeration_Pos): Unat.
(Enumeration_Rep): Valid_Uint. Can be negative, but must be
valid before fetching.
(Discriminant_Number): Upos.
(Renaming_Map): Remove.
* gen_il-gen-gen_nodes.adb (Char_Literal_Value, Reason): Unat.
(Intval, Corresponding_Integer_Value): Valid_Uint.
* gen_il-internals.ads: New functions for dealing with special
defaults and new subtypes of Uint.
* scans.ads: Correct comments.
* scn.adb (Post_Scan): Do not set Intval to No_Uint; that is no
longer allowed.
* sem_ch13.adb (Analyze_Enumeration_Representation_Clause): Do
not set Enumeration_Rep to No_Uint; that is no longer allowed.
(Offset_Value): Protect calls to Alignment with Known_Alignment.
* sem_prag.adb (Set_Atomic_VFA): Do not use Uint_0 to mean
"unknown"; call Init_Alignment instead.
* sinfo.ads: Minor comment fix.
* treepr.adb: Deal with printing of new field types.
* einfo.ads, gen_il-fields.ads (Renaming_Map): Remove.
* gcc-interface/decl.c (gnat_to_gnu_entity): Use Known_Alignment
before calling Alignment. This preserve some probably buggy
behavior: if the alignment is not set, it previously defaulted
to Uint_0; we now make that explicit. Use Copy_Alignment,
because "Set_Alignment (Y, Alignment (X));" no longer works when
the Alignment of X has not yet been set.
* gcc-interface/trans.c (process_freeze_entity): Use
Copy_Alignment.
gcc/ada/
* sem_ch13.adb (Duplicate_Clause): Add a helper routine
Check_One_Attr, with a parameter for the attribute_designator we
are looking for, and one for the attribute_designator of the
current node (which are usually the same). For Size and
Value_Size, call it twice, once for each.
* errout.ads: Fix a typo.
This amends the optimization message printed when a basic-block
part is vectorized to mention the number of SLP graph entries.
This helps when debugging vectorization differences and we end up
merging SLP instances for costing purposes.
2021-07-07 Richard Biener <rguenther@suse.de>
* tree-vect-slp.c (vect_slp_region): Show the number of
SLP graph entries in the optimization message.
* g++.dg/vect/slp-pr87105.cc: Adjust.
* gcc.dg/vect/bb-slp-pr54400.c: Likewise.
This avoids adding a copy from an abnormal picked up from PHI
translation much like we'd avoid inserting the translated
expression on pred edges.
2021-07-12 Richard Biener <rguenther@suse.de>
PR tree-optimization/101394
* tree-ssa-pre.c (do_pre_regular_insertion): Avoid inserting
copies from abnormals for a full redundancy.
* gcc.dg/torture/pr101394.c: New testcase.
This adjusts gimple_could_trap_p to not consider internal function
calls to trap compared to indirect calls or calls to weak functions.
2021-07-12 Richard Biener <rguenther@suse.de>
PR middle-end/101423
* gimple.c (gimple_could_trap_p_1): Internal function calls
do not trap.
* tree-eh.c (tree_could_trap_p): Likewise.
The patch moves vec_init pattern from neon.md to vec-common.md,
and adjusts the mode to VDQX to accomodate binary floats. Also,
the pattern is additionally gated on VALID_MVE_MODE.
gcc/ChangeLog:
PR target/98435
* config/arm/neon.md (vec_init): Move to ...
* config/arm/vec-common.md (vec_init): ... here.
Change the pattern's mode to VDQX and gate it on VALID_MVE_MODE.
gcc/testsuite/ChangeLog:
PR target/98435
* gcc.target/arm/simd/pr98435.c: New test.
My sincere apologies for the breakage. My recent patch to fold
bswapN(x)>>C where the constant C was large enough that the result
only contains bits from the low byte, and can therefore avoid
the byte swap contains a minor logic error. The pattern contains
a convert? allowing an extension to occur between the bswap and
the shift. The logic is correct if there's no extension, or the
extension has the same sign as the shift, but I'd mistakenly
convinced myself that these couldn't have different signedness.
(T)bswap16(x)>>12 is (T)((unsigned char)x>>4) or (T)((signed char)x>>4).
The bug is that for zero-extensions to signed type T, we need to use
the unsigned char variant [the signedness of the byte shift is not
(always) the same as the signedness of T and the original shift].
Then because I'm now paranoid, I've also added a clause to handle
the hypothetical (but in practice impossible) sign-extension to an
unsigned type T, which can implemented as (T)(x<<8)>>12.
2021-07-12 Roger Sayle <roger@nextmovesoftware.com>
gcc/ChangeLog
PR tree-optimization/101403
* match.pd ((T)bswap(X)>>C): Correctly handle cases where
signedness of the shift is not the same as the signedness of
the type extension.
gcc/testsuite/ChangeLog
PR tree-optimization/101403
* gcc.dg/pr101403.c: New test case.
Here we're failing to treat 'new T[N]' as erroneous in a SFINAE context
when T isn't default constructible because expand_aggr_init_1 doesn't
communicate to build_aggr_init (its only SFINAE caller) whether the
initialization was actually successful. To fix this, this patch makes
expand_aggr_init_1 and its subroutine expand_default_init return true on
success, false on failure so that build_aggr_init can properly return
error_mark_node on failure.
PR c++/82110
gcc/cp/ChangeLog:
* init.c (build_aggr_init): Return error_mark_node if
expand_aggr_init_1 returns false.
(expand_default_init): Change return type to bool. Return false
on error, true on success.
(expand_aggr_init_1): Likewise.
gcc/testsuite/ChangeLog:
* g++.dg/cpp0x/pr78765.C: Expect another conversion failure
diagnostic.
* g++.dg/template/sfinae14.C: Flip incorrect assertion.
* g++.dg/cpp2a/concepts-requires27.C: New test.
The upstream libffi has
commit cb8474368cdef3207638d047bd6c707ad8fcb339
Author: hjl-tools <hjl.tools@gmail.com>
Date: Wed Dec 2 12:52:12 2020 -0800
libffi/x86: Always check __x86_64__ for x32 hosts (#601) (#602)
Since for x86_64-*x32 and x86_64-x32-* hosts, -m32 generates ia32 codes.
We should always check __x86_64__ for x32 hosts.
Since for gnux32 hosts, -m32 generates i386 codes, always check __x86_64__
for x86 hosts.
PR libffi/101336
* configure.host: Always check __x86_64__ for x86 hosts.
duplicate_decls was not recognizing the explicit specialization as matching
the implicit specialization of g<Y> because
function_requirements_equivalent_p was seeing the C constraint on the
implicit one and not on the explicit.
PR c++/101098
gcc/cp/ChangeLog:
* decl.c (function_requirements_equivalent_p): Only compare
trailing requirements on a specialization.
gcc/testsuite/ChangeLog:
* g++.dg/concepts/explicit-spec1.C: New test.
This is primarily a source code refactoring, the only change is to
ensure that the outlined functions are marked to begin at the same
line as the original. Otherwise, they get the default (which seems
to be input_location, which corresponds to the closing brace at the
point that this is done). Having the source location point to that
confuses some debuggers.
This is a contributory fix to:
PR c++/99215 - coroutines: debugging with gdb
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/cp/ChangeLog:
* coroutines.cc (build_actor_fn): Move common code to
act_des_fn.
(build_destroy_fn): Likewise.
(act_des_fn): Build the void return here. Ensure that the
source location matches the original function.
This patch tweaks the way GCC handles 32-bit integer division on
x86_64, when the numerator is constant. Currently the function
int foo (int x) {
return 100/x;
}
generates the code:
foo: movl $100, %eax
cltd
idivl %edi
ret
where the sign-extension instruction "cltd" creates a long
dependency chain, as it depends on the "mov" before it, and
is depended upon by "idivl" after it.
With this patch, GCC now matches both icc and LLVM and uses
an xor instead, generating:
foo: xorl %edx, %edx
movl $100, %eax
idivl %edi
ret
Microbenchmarking confirms that this is faster on Intel
processors (Kaby lake), and no worse on AMD processors (Zen2),
which agrees with intuition, but oddly disagrees with the
llvm-mca cycle count prediction on godbolt.org.
The tricky bit is that this sign-extension instruction is only
produced by late (postreload) splitting, and unfortunately none
of the subsequent passes (e.g. cprop_hardreg) is able to
propagate and simplify its constant argument. The solution
here is to introduce a define_insn_and_split that allows the
constant numerator operand to be captured (by combine) and
then split into an optimal form after reload.
The above microbenchmarking also shows that eliminating the
sign extension of negative values (using movl $-1,%edx) is also
a performance improvement, as performed by icc but not by LLVM.
Both the xor and movl sign-extensions are larger than cltd,
so this transformation is prevented for -Os.
2021-07-09 Roger Sayle <roger@nextmovesoftware.com>
Uroš Bizjak <ubizjak@gmail.com>
gcc/ChangeLog
* config/i386/i386.md (*divmodsi4_const): Optimize SImode
divmod of a constant numerator with new define_insn_and_split.
gcc/testsuite/ChangeLog
* gcc.target/i386/divmod-9.c: New test case.
When amending the function re-write code, I made a typo in
the block connections. This has not shown up in any test
fails (as far as can be seen) but is a regression in debug
info.
Fixed thus.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/cp/ChangeLog:
* coroutines.cc
(coro_rewrite_function_body): Connect the replacement
function block to the block nest correctly.
We allow public functions defined in a TU to bind locally for PIC
code (the default) on 64bit Mach-O.
If such functions are not inlined, we cannot tell at compile-time if
they might be called via the lazy symbol resolver (this can depend on
options given at link-time). Therefore, we must assume that the lazy
resolver could be used which clobbers R11 and R10.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/ChangeLog:
PR target/100152
* config/i386/i386-expand.c (ix86_expand_call): If a call is
to a non-local-binding, or local but to a public symbol, then
assume that it might be indirected via the lazy symbol binder.
Mark R10 and R10 as clobbered in that case.
There were two uses for the Darwin host config fragment:
The first is to arrange for targets that support mdynamic-no-pic
to be built with that enabled (since it makes a significant
difference to the compiler performance). We can be more specific
in the application of this, since it only applies to 32b hosts
plus powerpc64-darwin9.
The second was to work around a tool bug where -fno-PIE was not
propagated to the link stage. This second use is redundant,
since the buggy toolchain cannot bootstrap current GCC sources
anyway.
This makes the host fragment more specific and reduces the number
of toolchains for which it is included which reduces clutter in
configure lines.
Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
config/ChangeLog:
* mh-darwin: Make this specific to handling the
mdynamic-no-pic case.
ChangeLog:
* configure: Regenerate.
* configure.ac: Adjust cases for which it is necessary to
include the Darwin host config fragment.
PR testsuite/101269 - new test case gcc.dg/debug/btf/btf-datasec-1.c
fails with its introduction in r12-1852
BTF datasec records for .rodata/.data are expected for now for all targets.
For powerpc based targets, use -msdata=none when ilp32 is enabled.
2021-07-09 Indu Bhagat <indu.bhagat@oracle.com>
gcc/testsuite/ChangeLog:
PR testsuite/101269
* gcc.dg/debug/btf/btf-datasec-1.c: Force -msdata=none with ilp32 for
powerpc based targets.
Here we're crashing ultimately because the mechanism for delaying
substitution into a requires-expression (and constexpr if and pack
expansions) doesn't expect to see dependent args. But we end up
capturing dependent args here during substitution into the default
template argument as part of coerce_template_parms for the dependent
specialization p<T>.
This patch enables the commented out code in add_extra_args for handling
this situation. This isn't needed for pack expansions (as the
accompanying comment points out), and it doesn't seem strictly necessary
for constexpr if either, but for requires-expressions delaying even
dependent substitution is important for ensuring we don't evaluate
requirements out of order.
It turns out we also need to make a copy of the arguments when capturing
them so that coerce_template_parms doesn't later add to them and form an
unexpected cycle (REQUIRES_EXPR_EXTRA_ARGS (t) would indirectly point to t).
We also need to make tsubst_template_args handle missing template
arguments, since the arguments we capture from coerce_template_parms
and are incomplete at that point.
PR c++/101181
gcc/cp/ChangeLog:
* constraint.cc (tsubst_requires_expr): Pass complain/in_decl to
add_extra_args.
* cp-tree.h (add_extra_args): Add complain/in_decl parameters.
* pt.c (build_extra_args): Make a copy of args.
(add_extra_args): Add complain/in_decl parameters. Enable the
code for handling the case where the extra arguments are
dependent.
(tsubst_pack_expansion): Pass complain/in_decl to
add_extra_args.
(tsubst_template_args): Handle missing template arguments.
(tsubst_expr) <case IF_STMT>: Pass complain/in_decl to
add_extra_args.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-requires26.C: New test.
* g++.dg/cpp2a/lambda-uneval16.C: New test.
r12-1989 fixed the testcase in the PR, but unfortunately the fix is
buggy: it breaks the case where the common template between the
TEMPLATE_DECL t and ctx_parms is the innermost template (as in
concepts-memtmpl5.C below). This can be fixed by instead passing the
TREE_TYPE of ctmpl to common_enclosing_class when ctmpl is a class
template.
But even after that's fixed, the analogous case where the innermost
template is a partial specialization is still broken (as in
concepts-memtmpl5a.C below), because ctmpl is always a primary template.
So this patch instead takes a diferent approach that doesn't rely on
ctx_parms at all: when looking for the template parameters of a
TEMPLATE_DECL that are shared with the current template context, just
walk its DECL_CONTEXT. As long as the template is not overly general
(e.g. we didn't pass it through most_general_template), this should give
us exactly what we want, since if a TEMPLATE_DECL can be referred to
from some template context then the template parameters it uses must all
be in-scope and contained in its DECL_CONTEXT. This effectively makes
us treat TEMPLATE_DECLs more similarly to other _DECLs (whose DECL_CONTEXT
we also walk).
PR c++/101247
gcc/cp/ChangeLog:
* pt.c (any_template_parm_r) <case TEMPLATE_DECL>: Just walk the
DECL_CONTEXT.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-memtmpl4.C: Uncomment the commented out
example, which we now handle correctly.
* g++.dg/cpp2a/concepts-memtmpl5.C: New test.
* g++.dg/cpp2a/concepts-memtmpl5a.C: New test.
gcc/ada/
* exp_put_image.adb (Make_Component_Attributes): Use
Implementation_Base_Type to get the parent type. Otherwise,
Parent_Type_Decl is actually an internally generated subtype
declaration, so we blow up on
Type_Definition (Parent_Type_Decl).
gcc/ada/
* libgnat/a-cdlili.adb: Reimplement
Ada.Containers.Doubly_Linked_Lists.Generic_Sorting.Sort using
Mergesort instead of the previous Quicksort variant.
gcc/ada/
* exp_ch6.adb (Is_Build_In_Place_Function_Call): Add check to
verify the Selector_Name of Exp_Node has been analyzed before
obtaining its entity.
gcc/ada/
* libgnarl/s-osinte__vxworks.ads: Fix typo ("release" =>
"releases") plus comment reformatting.
* libgnat/s-os_lib.ads: In a comment, fix typo ("indended" =>
"intended"), add a hyphen and semicolon, plus reformatting. In
comment for subtype time_t, fix typo ("effect" => "affect"), add
hyphens, plus reformatting.
* libgnat/s-parame.ads, libgnat/s-parame__ae653.ads,
libgnat/s-parame__hpux.ads: Remove period from one-line comment.
gcc/ada/
* exp_ch5.adb (Expand_General_Case_Statement): Add new function
Else_Statements to handle the case of invalid data analogously
to how it is handled when casing on a discrete value.
* sem_case.adb (Has_Static_Discriminant_Constraint): A new
Boolean-valued function.
(Composite_Case_Ops.Scalar_Part_Count): Include discriminants
when traversing components.
(Composite_Case_Ops.Choice_Analysis.Traverse_Discrete_Parts):
Include discriminants when traversing components; the component
range for a constrained discriminant is a single value.
(Composite_Case_Ops.Choice_Analysis.Parse_Choice): Eliminate
Done variable and modify how Next_Part is computed so that it is
always correct (as opposed to being incorrect when Done is
True). This includes changes in Update_Result (a local
procedure). Add new local procedure
Update_Result_For_Box_Component and call it not just for box
components but also for "missing" components (components
associated with an inactive variant).
(Check_Choices.Check_Composite_Case_Selector.Check_Component_Subtype):
Instead of disallowing all discriminated component types, allow
those that are unconstrained or statically constrained. Check
discriminant subtypes along with other component subtypes.
* doc/gnat_rm/implementation_defined_pragmas.rst: Update
documentation to reflect current implementation status.
* gnat_rm.texi: Regenerate.
