As reported in bug 82359, the preprocessor does not allow C++ digit
separators in the line number in a #line directive, despite the
standard syntax for that directive using digit-sequence which allows
digit separators.
There is some confusion in that bug about whether C++ is meant to
allow digit separators there or not, but the last comment there
suggests they are meant to be allowed, and the version of digit
separators accepted for C2X at the March meeting explicitly mentions
digit separators in the #line specification to avoid any ambiguity
there.
This patch thus adds code to handle digit separators in the line
number in #line, as part of the preparation for enabling digit
separators in C2X mode. The code changed does not contain any
conditionals for whether digit separators are supported in the chosen
language version, because that was handled earlier in pp-number lexing
and if they aren't supported they won't appear in the string passed to
that function. It does however make sure not to allow adjacent digit
separators because those are only handled at a later stage of lexing
at present. (Problems with how certain source character sequences
involving digit separators that don't actually match the pp-number
syntax get lexed as a pp-number and only diagnosed later, if at all,
are bugs 83873 and 97604, to be addressed separately.)
Making the change in this location will have the effect of allowing
digit separators in the "# <line-number> <file> <flags>" form of
directive as well as #line; I don't think that's a problem.
Bootstrapped with no regressions for x86_64-pc-linux-gnu.
libcpp/
PR preprocessor/82359
* directives.c (strtolinenum): Handle digit separators.
gcc/testsuite/
PR preprocessor/82359
* g++.dg/cpp1y/digit-sep-line.C,
g++.dg/cpp1y/digit-sep-line-neg.C: New tests.
In discussion of PR98463, Jakub noted that cxx_fold_indirect_ref_1 was
bailing out early for empty bases even when we do have fields for them (in
C++17 mode or later). This corrects that.
gcc/cp/ChangeLog:
* constexpr.c (cxx_fold_indirect_ref_1): Only set *empty_base if we
don't find a field.
51344 was a problem with calling save_template_attributes twice for the same
friend function: once from do_friend and once from grokmethod. The 2012
patch for the bug avoided creating an infinite loop when this happens, but
it's better to avoid the duplication in the first place. This also restores
the dependent attributes to the beginning of the attribute list, as
originally intended. And then apply_late_template_attributes can avoid
copying the non-dependent attributes.
gcc/cp/ChangeLog:
PR c++/51344
* decl2.c (grokfield): Call cplus_decl_attributes for friend.
(save_template_attributes): Use chainon.
* friend.c (do_friend): Remove attrlist parm.
* cp-tree.h (do_friend): Adjust.
* class.c (add_implicitly_declared_members): Adjust.
* decl.c (grokdeclarator): Adjust.
* pt.c (apply_late_template_attributes): Optimize.
While working on the GCC 11 patch, it occurred to me that we could move
the errors about invalid members from finish_struct_anon_r to here, so we
properly get a diagnostic in g++.law/union4.C.
gcc/cp/ChangeLog:
PR c++/97974
* class.c (finish_struct_anon_r): Drop complain parm.
Remove non-field diagnostic.
(finish_struct_anon): Adjust.
* decl.c (fixup_anonymous_aggr): Move non-field diagnostic here.
gcc/testsuite/ChangeLog:
PR c++/97974
* g++.old-deja/g++.law/union4.C: Add expected diagnostic.
My GCC 11 patch for PR93314 turned off cp_unevaluated_operand while
processing an id-expression that names a non-static data member, but the
broader issue is that in general, a constant-expression is evaluated even in
an unevaluated operand.
gcc/cp/ChangeLog:
* cp-tree.h (cp_evaluated): Add reset parm to constructor.
* parser.c (cp_parser_constant_expression): Change
allow_non_constant_p to int. Use cp_evaluated.
(cp_parser_initializer_clause): Pass 2 to allow_non_constant_p.
* semantics.c (finish_id_expression_1): Don't mess with
cp_unevaluated_operand here.
Once a CONSTRUCTOR has been digested and used as an initializer, it no
longer represents a compound literal by itself, so we can clear the flag,
letting us use it consistently to distinguish between digested and
undigested initializer-lists.
gcc/cp/ChangeLog:
* cp-tree.h: Clarify comments.
* pt.c (get_template_parm_object): Add assert.
* semantics.c (finish_compound_literal): Clear TREE_HAS_CONSTRUCTOR.
* tree.c (zero_init_expr_p): Check TREE_HAS_CONSTRUCTOR.
* typeck2.c (store_init_value): Likewise.
Here, at template definition time, ordinary name lookup for 'foo(t)'
finds only the deleted function, and so we form a CALL_EXPR thereof.
Later at instantiation time, when initially substituting into this
CALL_EXPR with T=N::A, we end up calling mark_used on this deleted
function (since it's the only function in the overload set), triggering
a bogus "use of deleted function error", before we get to augment the
overload set via ADL.
This patch fixes this issue by using the tf_conv flag to disable
mark_used during the initial substitution into the callee of a
CALL_EXPR when KOENIG_P, since at this point we're still figuring out
which functions are candidates.
gcc/cp/ChangeLog:
PR c++/68942
* pt.c (tsubst_copy_and_build) <case CALL_EXPR>: When KOENIG_P,
set tf_conv during the initial substitution into the function.
gcc/testsuite/ChangeLog:
PR c++/68942
* g++.dg/template/koenig12.C: New test.
This patch fixes an oversight in the handling of debug instructions
in rtl-ssa. At the moment (and whether this is a good idea or not
remains to be seen), we maintain a linear RPO sequence of definitions
and non-debug uses. If a register is defined more than once, we use
a degenerate phi to reestablish a previous definition where necessary.
However, debug instructions shouldn't of course affect codegen,
so we can't create a new definition just for them. In those situations
we instead hang the debug use off the real definition (meaning that
debug uses do not follow a linear order wrt definitions). Again,
it remains to be seen whether that's a good idea.
The problem in the PR was that we weren't taking this into account
when increasing (or potentially increasing) the live range of an
existing definition. We'd create the phi even if it would only
be used by debug instructions.
The patch goes for the simple but inelegant approach of passing
a bool to say whether the use is a debug use or not. I imagine
this area will need some tweaking based on experience in future.
gcc/
PR rtl-optimization/100303
* rtl-ssa/accesses.cc (function_info::make_use_available): Take a
boolean that indicates whether the use will only be used in
debug instructions. Treat it in the same way that existing
cross-EBB debug references would be handled if so.
(function_info::make_uses_available): Likewise.
* rtl-ssa/functions.h (function_info::make_uses_available): Update
prototype accordingly.
(function_info::make_uses_available): Likewise.
* fwprop.c (try_fwprop_subst): Update call accordingly.
Mark x86 AVX and AVX2 masked load builtins pure to enable dead code
elimination and more appropriate alias analysis.
2021-04-29 Uroš Bizjak <ubizjak@gmail.com>
Richard Biener <rguenther@suse.de>
gcc/
PR target/100312
* config/i386/i386-builtin.def (IX86_BUILTIN_MASKLOADPD)
(IX86_BUILTIN_MASKLOADPS, IX86_BUILTIN_MASKLOADPD256)
(IX86_BUILTIN_MASKLOADPS256, IX86_BUILTIN_MASKLOADD)
(IX86_BUILTIN_MASKLOADQ, IX86_BUILTIN_MASKLOADD256)
(IX86_BUILTIN_MASKLOADQ256): Move from SPECIAL_ARGS
to PURE_ARGS category.
* config/i386/i386-builtins.c (ix86_init_mmx_sse_builtins):
Handle PURE_ARGS category.
* config/i386/i386-expand.c (ix86_expand_builtin): Ditto.
If you attempt a profiled bootstrap on the MinGW platforms with -jN, N > 1,
it miserably fails because of profile mismatches all over the place, the
reason being that gcov has no support for parallelism on these platforms.
libgcc/
* libgcov.h: For the target, define GCOV_LOCKED_WITH_LOCKING
if __MSVCRT__ and, for the host, define it if HOST_HAS_LK_LOCK.
* libgcov-driver.c: Add directives if GCOV_LOCKED_WITH_LOCKING.
gcc/
* configure.ac: Check for the presence of sys/locking.h header and
for whether _LK_LOCK is supported by _locking.
* configure: Regenerate.
* config.in: Likewise.
* gcov-io.h: Define GCOV_LOCKED_WITH_LOCKING if HOST_HAS_LK_LOCK.
* gcov-io.c (gcov_open): Add support for GCOV_LOCKED_WITH_LOCKING.
* system.h: Include <sys/locking.h> if HAVE_SYS_LOCKING_H.
CCCmode is allowed only with GEU and LTU comparison codes. Also allow
CCGZmode for these two codes. There is no need to check for trivial FP
comparison operator, ix86_fp_compare_code_to_integer will return
UNKNOWN code for unsupported operators.
2021-04-29 Uroš Bizjak <ubizjak@gmail.com>
gcc/
* config/i386/predicates.md (fcmov_comparison_operator):
Do not check for trivial FP comparison operator.
<case GEU, case LTU>: Allow CCGZmode.
<case GTU, case LEU>: Do not allow CCCmode.
(ix86_comparison_operator) <case GTU, case LEU>: Allow only CCmode.
(ix86_carry_flag_operator): Match only LTU and UNLT code.
Do not check for trivial FP comparison operator. Allow CCGZmode.
Consider the test-case libgomp.c/pr81778.c added in this commit, with
this core loop (note: CANARY_SIZE set to 0 for simplicity):
...
int s = 1;
#pragma omp target simd
for (int i = N - 1; i > -1; i -= s)
a[i] = 1;
...
which, given that N is 32, sets a[0..31] to 1.
After omp-expand, this looks like:
...
<bb 5> :
simduid.7 = .GOMP_SIMT_ENTER (simduid.7);
.omp_simt.8 = .GOMP_SIMT_ENTER_ALLOC (simduid.7);
D.3193 = -s;
s.9 = s;
D.3204 = .GOMP_SIMT_LANE ();
D.3205 = -s.9;
D.3206 = (int) D.3204;
D.3207 = D.3205 * D.3206;
i = D.3207 + 31;
D.3209 = 0;
D.3210 = -s.9;
D.3211 = D.3210 - i;
D.3210 = -s.9;
D.3212 = D.3211 / D.3210;
D.3213 = (unsigned int) D.3212;
D.3213 = i >= 0 ? D.3213 : 0;
<bb 19> :
if (D.3209 < D.3213)
goto <bb 6>; [87.50%]
else
goto <bb 7>; [12.50%]
<bb 6> :
a[i] = 1;
D.3215 = -s.9;
D.3219 = .GOMP_SIMT_VF ();
D.3216 = (int) D.3219;
D.3220 = D.3215 * D.3216;
i = D.3220 + i;
D.3209 = D.3209 + 1;
goto <bb 19>; [100.00%]
...
On nvptx, the first time bb6 is executed, i is in the 0..31 range (depending
on the lane that is executing) at bb entry.
So we have the following sequence:
- a[0..31] is set to 1
- i is updated to -32..-1
- D.3209 is updated to 1 (being 0 initially)
- bb19 is executed, and if condition (D.3209 < D.3213) == (1 < 32) evaluates
to true
- bb6 is once more executed, which should not happen because all the elements
that needed to be handled were already handled.
- consequently, elements that should not be written are written
- with CANARY_SIZE == 0, we may run into a libgomp error:
...
libgomp: cuCtxSynchronize error: an illegal memory access was encountered
...
and with CANARY_SIZE unmodified, we run into:
...
Expected 0, got 1 at base[-961]
Aborted (core dumped)
...
The cause of this is as follows:
- because the step s is a variable rather than a constant, an alternative
IV (D.3209 in our example) is generated in expand_omp_simd, and the
loop condition is tested in terms of the alternative IV rather than
the original IV (i in our example).
- the SIMT code in expand_omp_simd works by modifying step and initial value.
- The initial value fd->loop.n1 is loaded into a variable n1, which is
modified by the SIMT code and then used there-after.
- The step fd->loop.step is loaded into a variable step, which is modified
by the SIMT code, but afterwards there are uses of both step and
fd->loop.step.
- There are uses of fd->loop.step in the alternative IV handling code,
which should use step instead.
Fix this by introducing an additional variable orig_step, which is not
modified by the SIMT code and replacing all remaining uses of fd->loop.step
by either step or orig_step.
Build on x86_64-linux with nvptx accelerator, tested libgomp.
This fixes for-5.c and for-6.c FAILs I'm currently seeing on a quadro m1200
with driver 450.66.
gcc/ChangeLog:
2020-10-02 Tom de Vries <tdevries@suse.de>
* omp-expand.c (expand_omp_simd): Add step_orig, and replace uses of
fd->loop.step by either step or orig_step.
libgomp/ChangeLog:
2020-10-02 Tom de Vries <tdevries@suse.de>
* testsuite/libgomp.c/pr81778.c: New test.
Add an overlap_op_by_pieces_p target hook for op_by_pieces operations
between two areas of memory to generate one offset adjusted operation
in the smallest integer mode for the remaining bytes on the last piece
operation of a memory region to avoid doing more than one smaller
operations.
Pass the RTL information from the previous iteration to m_constfn in
op_by_pieces operation so that builtin_memset_[read|gen]_str can
generate the new RTL from the previous RTL.
Tested on Linux/x86-64.
gcc/
PR middle-end/90773
* builtins.c (builtin_memcpy_read_str): Add a dummy argument.
(builtin_strncpy_read_str): Likewise.
(builtin_memset_read_str): Add an argument for the previous RTL
information and generate the new RTL from the previous RTL info.
(builtin_memset_gen_str): Likewise.
* builtins.h (builtin_strncpy_read_str): Update the prototype.
(builtin_memset_read_str): Likewise.
* expr.c (by_pieces_ninsns): If targetm.overlap_op_by_pieces_p()
returns true, round up size and alignment to the widest integer
mode for maximum size.
(pieces_addr::adjust): Add a pointer to by_pieces_prev argument
and pass it to m_constfn.
(op_by_pieces_d): Add m_push and m_overlap_op_by_pieces.
(op_by_pieces_d::op_by_pieces_d): Add a bool argument to
initialize m_push. Initialize m_overlap_op_by_pieces with
targetm.overlap_op_by_pieces_p ().
(op_by_pieces_d::run): Pass the previous RTL information to
pieces_addr::adjust and generate overlapping operations if
m_overlap_op_by_pieces is true.
(PUSHG_P): New.
(move_by_pieces_d::move_by_pieces_d): Updated for op_by_pieces_d
change.
(store_by_pieces_d::store_by_pieces_d): Updated for op_by_pieces_d
change.
(can_store_by_pieces): Use by_pieces_constfn on constfun.
(store_by_pieces): Use by_pieces_constfn on constfun. Updated
for op_by_pieces_d change.
(clear_by_pieces_1): Add a dummy argument.
(clear_by_pieces): Updated for op_by_pieces_d change.
(compare_by_pieces_d::compare_by_pieces_d): Likewise.
(string_cst_read_str): Add a dummy argument.
* expr.h (by_pieces_constfn): Add a dummy argument.
(by_pieces_prev): New.
* target.def (overlap_op_by_pieces_p): New target hook.
* config/i386/i386.c (TARGET_OVERLAP_OP_BY_PIECES_P): New.
* doc/tm.texi.in: Add TARGET_OVERLAP_OP_BY_PIECES_P.
* doc/tm.texi: Regenerated.
gcc/testsuite/
PR middle-end/90773
* g++.dg/pr90773-1.h: New test.
* g++.dg/pr90773-1a.C: Likewise.
* g++.dg/pr90773-1b.C: Likewise.
* g++.dg/pr90773-1c.C: Likewise.
* g++.dg/pr90773-1d.C: Likewise.
* gcc.target/i386/pr90773-1.c: Likewise.
* gcc.target/i386/pr90773-2.c: Likewise.
* gcc.target/i386/pr90773-3.c: Likewise.
* gcc.target/i386/pr90773-4.c: Likewise.
* gcc.target/i386/pr90773-5.c: Likewise.
* gcc.target/i386/pr90773-6.c: Likewise.
* gcc.target/i386/pr90773-7.c: Likewise.
* gcc.target/i386/pr90773-8.c: Likewise.
* gcc.target/i386/pr90773-9.c: Likewise.
* gcc.target/i386/pr90773-10.c: Likewise.
* gcc.target/i386/pr90773-11.c: Likewise.
* gcc.target/i386/pr90773-12.c: Likewise.
* gcc.target/i386/pr90773-13.c: Likewise.
* gcc.target/i386/pr90773-14.c: Likewise.
At some point DR_MISALIGNMENT was supposed to be -1 when the
access was not element aligned. That's obviously not true at this
point so this adjusts both store and load vectorizing to no longer
assume this which in turn allows simplifying the code.
2021-04-29 Richard Biener <rguenther@suse.de>
PR tree-optimization/100253
* tree-vect-stmts.c (vectorizable_load): Do not assume
element alignment when DR_MISALIGNMENT is -1.
(vectorizable_store): Likewise.
* g++.dg/pr100253.C: New testcase.
The test FAILs on i?86-linux (due to -Wpsabi warnings). But, on closer
inspection it seems there is another problem, the dg-options in the testcase
means that the test is compiled with -O0 -O, -O1 -O, -O2 -O, -O3 -O, -Os -O
etc. options, so effectively is tested multiple times with the same options.
Fixed by dropping the dg-options line, then we have -w by default and iterate
over all the optimization levels (including the -O).
2021-04-29 Jakub Jelinek <jakub@redhat.com>
PR target/100305
* gcc.c-torture/compile/pr100305.c: Remove dg-options. Add PR line.
In PR94121 I've changed aarch64_add_offset_1 to use absu_hwi instead of
abs_hwi because offset can be HOST_WIDE_INT_MIN. As can be seen with
the testcase below, aarch64_add_offset_1_temporaries suffers from the same
problem and should be in sync with aarch64_add_offset_1, i.e. for
HOST_WIDE_INT_MIN it needs a temporary.
2021-04-29 Jakub Jelinek <jakub@redhat.com>
PR target/100302
* config/aarch64/aarch64.c (aarch64_add_offset_1_temporaries): Use
absu_hwi instead of abs_hwi.
* gcc.target/aarch64/sve/pr100302.c: New test.
The standard says that "The event-handle will be considered as if it
was specified on a firstprivate clause." which means that it can't
be explicitly specified in some other data-sharing clause.
The checking is implemented correctly for C, but for C++ when detach_seen
is true (i.e. the construct had detach clause) we were comparing
OMP_CLAUSE_DECL (c) with t, which was previously initialized to
OMP_CLAUSE_DECL (c), which means it complained about any explicit
data-sharing clause on the same construct with a detach clause.
Fixed by remembering the detach clause in detach_seen (instead of a boolean
flag) and comparing against its OMP_CLAUSE_DECL.
2021-04-29 Jakub Jelinek <jakub@redhat.com>
PR c++/100319
* semantics.c (finish_omp_clauses): Fix up check that variable
mentioned in detach clause doesn't appear in data-sharing clauses.
* c-c++-common/gomp/task-detach-3.c: New test.
In testcases like PR38474 and PR99912 we're seeing very slow
PTA solving. One can observe an excessive amount of forwarding,
mostly during sd constraint solving. The way we solve the graph
does not avoid forwarding the same bits through multiple paths,
and especially when such alternate path involves ESCAPED as
intermediate this causes the ESCAPED solution to be expanded
in receivers.
The following adds heuristic to add_graph_edge which adds
forwarding edges but also guards the initial solution forwarding
(which is the expensive part) to detect the case of ESCAPED
receiving the same set and the destination already containing
ESCAPED.
This speeds up the PTA solving process by more than 50%.
2021-04-29 Richard Biener <rguenther@suse.de>
PR middle-end/38474
* tree-ssa-structalias.c (add_graph_edge): Avoid direct
forwarding when indirect forwarding through ESCAPED
alread happens.
gcc/ada/
* exp_attr.adb (Expand_N_Attribute_Reference)
<Attribute_Max_Size_In_Storage_Elements>: Apply the checks for
universal integer contexts only in the default case.
* exp_ch4.adb (Get_Size_For_Range): Move to library level.
(Expand_N_Type_Conversion): If the operand has Universal_Integer
type and the conversion requires an overflow check, try to do an
intermediate conversion to a narrower type.
gcc/ada/
* sem_ch3.adb (Check_Anonymous_Access_Component): Factor out
core processing of Check_Anonymous_Access_Components.
(Check_Anonymous_Access_Components): Call
Check_Anonymous_Access_Component.
(Process_Discriminants): Call Check_Anonymous_Access_Component.
* freeze.adb (Freeze_Record_Type): Code cleanups and add more tree
checking to handle changes in sem_ch3.adb.
* sem_ch8.adb (Find_Type): Remove special case for access
discriminant in task types, these are now supported.
gcc/ada/
* exp_ch4.adb (Expand_Compare_Minimize_Eliminate_Overflow): Remove
entry condition.
(Expand_N_In): Call Minimized_Eliminated_Overflow_Check on the left
operand before doing the special overflow expansion.
(Expand_N_Op_Eq): Likewise.
(Expand_N_Op_Ge): Likewise.
(Expand_N_Op_Gt): Likewise.
(Expand_N_Op_Le): Likewise.
(Expand_N_Op_Lt): Likewise.
(Expand_N_Op_Ne): Likewise.
(Minimized_Eliminated_Overflow_Check): Return False for Minimized
if the size of the type is greater than that of Long_Long_Integer.
gcc/ada/
* exp_ch5.adb (Expand_N_If_Statement): Only perform the
simplification on return True/False for internal nodes when
-fpreserve-control-flow is not set.
gcc/ada/
* sem_attr.adb (Analyze_Attribute): Change "$" to "&".
Otherwise, Errout will trip over an uninitialized (invalid)
variable (Error_Msg_Unit_1).
gcc/ada/
* libgnat/s-valuer.adb (Scan_Decimal_Digits): Set Extra to zero
when the precision limit is reached by means of trailing zeros
and prevent it from being overwritten later.
gcc/ada/
* errout.adb (Output_Messages): Insert SGR strings where needed.
* erroutc.adb (Output_Message_Txt): Insert SGR strings where
needed in the text of the message itself.
(Output_Msg_Text): Allow for style message not to start
with (style).
* erroutc.ads: Add new constants and functions to control colors
in messages output to the terminal. Add variable Use_SGR_Control
that should be set to True for using SGR color control strings.
gcc/ada/
* sem_eval.adb (Check_Non_Static_Context_For_Overflow): Apply
compile-time checking for overflows in non-static contexts
including inlined code.
(Eval_Arithmetic_Op): Use the new procedure.
(Eval_Unary_Op, Eval_Op_Expon): Add call to the new procedure.
gcc/ada/
* checks.adb (Apply_Type_Conversion_Checks): Move out constraint
check generation, and add case for general access types with
constraints.
(Make_Discriminant_Constraint_Check): Created to centralize
generation of constraint checks for stored discriminants.
gcc/ada/
* exp_aggr.adb (Collect_Initialization_Statements): Removed.
(Convert_Aggr_In_Object_Decl, Expand_Array_Aggregate): Fix
creation and insertion of Initialization_Statements. Do not set
Initialization_Statements when a transient scope is involved.
Move processing of Array_Slice here. Ensure that an object with
an Array_Slice call gets its array component initialized. Add
comments.
* exp_ch7.adb: Update comments.
(Store_Actions_In_Scope): Deal properly with an empty list which
might now be generated by Convert_Aggr_In_Object_Decl.
* exp_ch3.adb: Update comments.
(Expand_N_Object_Declaration): Remove processing of Array_Slice.
gcc/ada/
* exp_util.adb (Add_Own_DIC): Relax the suppression of adding a
DIC Check pragma that's done for abstract types by still doing
it in the case where GNATprove_Mode is set.
gcc/ada/
* layout.adb (Layout_Type): Refine type of a local variable with
the required size of object from Int to Pos (it is initialized
with 8 and only multiplied by 2); fix unbalanced parens in
comment.
gcc/ada/
* sem_util.adb (Build_Constrained_Itype): Inhibit the generation
of predicate functions for this Itype, which is created for an
aggregate of a discriminated type. The object to which the
aggregate is assigned, e.g a writable actual parameter, will
apply the predicates if any are inherited from the base type.
gcc/ada/
* sem_cat.adb (Set_Categorization_From_Pragmas): Remove special
case for generic child units; remove optimization for empty list
of pragmas; properly restore visibility.
gcc/ada/
* sem_elab.adb (Process_SPARK_Instantiation): Fix typo in
comment.
* sem_prag.adb (Find_Related_Context): Add missing reference to
No_Caching in the comment; handle pragmas on compilation units.
gcc/ada/
* doc/gnat_rm/implementation_defined_attributes.rst: Change all
occurrences of "permissible prefix" to "allowed prefix", for
consistency.
* gnat_rm.texi: Regenerate.
gcc/ada/
* eval_fat.adb (Succ): Add a special case for zero if the type does
not support denormalized numbers. Always use the canonical formula
in other cases and add commentary throughout the function.
gcc/ada/
* libgnat/s-fatgen.adb: Remove with clause for Interfaces and
use type clauses for Interfaces.Unsigned_{16,32,64}.
(Small16): Remove.
(Small32): Likewise
(Small64): Likewise.
(Small80): Likewise.
(Tiny16): Likewise.
(Tiny32): Likewise.
(Tiny64): Likewise.
(Tiny80): Likewise.
(Siz): Always use 16.
(NR): New constant.
(Rep_Last): Use it in the computation.
(Exp_Factor): Remove special case for 80-bit.
(Sign_Mask): Likewise.
(Finite_Succ): New function implementing the Succ attribute for
finite numbers.
(Pred): Rewrite in terms of Finite_Succ.
(Succ): Likewise.
