In C, an enumerated type is compatible with char, a signed integer type,
or an unsigned integer type (6.7.2.2/5). Therefore this code compiles:
enum E { l = -1, z = 0, g = 1 };
int foo(void);
enum E foo(void) { return z; }
if the underlying type of 'enum E' is 'int' (if not, we emit an error).
This is different for typedefs, where C11 permits typedefs to be
redeclared to the same type, but not to compatible types. In C++, the
code above is invalid.
It seems desirable to emit a warning in the C case, because it is
probably a mistake and definitely a portability error, given that the
choice of the underlying type is implementation-defined.
To that end, this patch implements a new -Wenum-int-mismatch warning.
Conveniently, we already have comptypes_check_enum_int to detect such
mismatches. This warning is enabled by either -Wall or -Wc++-compat.
PR c/105131
gcc/c-family/ChangeLog:
* c.opt (Wenum-int-mismatch): New.
gcc/c/ChangeLog:
* c-decl.cc (diagnose_mismatched_decls): Warn about enum/integer type
mismatches.
* c-tree.h (comptypes_check_enum_int): Declare.
* c-typeck.cc (comptypes): No longer static.
gcc/ChangeLog:
* doc/invoke.texi: Document -Wenum-int-mismatch.
gcc/testsuite/ChangeLog:
* gcc.dg/Wenum-int-mismatch-1.c: New test.
* gcc.dg/Wenum-int-mismatch-2.c: New test.
* gcc.dg/Wenum-int-mismatch-3.c: New test.
* gcc.dg/Wenum-int-mismatch-4.c: New test.
* gcc.dg/Wenum-int-mismatch-5.c: New test.
Commit eccbd7fcee moved the subject file to
g++.target/powerpc. Unfortunately, test g++.dg/tsan/pr88018.C includes
"../pr69667.C".
Revert the move of this file.
Commit 14e678a2c4 relaxed some DejaGnu
directives in g++.dg/tsan/pr88018.C, given its more restrictive environment
within g++.target/powerpc. Revert these changes in that file as well.
2022-05-18 Paul A. Clarke <pc@us.ibm.com>
gcc/testsuite
PR target/105620
* g++.target/powerpc/pr69667.C: Move to ...
* g++.dg/pr69667.C: here. Also, revert recent dg directives changes.
Since commit c163647ffb -fsplit-stack
is only supported on glibc targets. However, this original commit
required some fixups. As part of the fixup, the changes to the
gnu-user-common.h and gnu.h were partially reverted in commit
60953a23d5 thus causing TARGET_CAN_SPLIT_STACK
to be defined for non-glibc targets even though -fsplit-stack is
actually not supported and attempting to use it causes a runtime error.
This causes gcc internal code, such as ./gcc/go/gospec.c to not
correctly detect that -fsplit-stack is not supported and thus causes
gccgo to fail compilation on non-glibc targets.
This commit ensures that TARGET_CAN_SPLIT_STACK is only set if the
default libc is glibc. It is presently unclear to me if there is a
better way to detect glibc at pre-processor time.
The proposed changes have been tested on x86 and x86_64 Alpine Linux
(which uses musl libc) and fix compilation of gccgo for this target.
Signed-off-by: Sören Tempel <soeren@soeren-tempel.net>
gcc/ChangeLog:
* config/i386/gnu-user-common.h (defined): Only define
TARGET_CAN_SPLIT_STACK for glibc targets.
* config/i386/gnu.h (defined): Ditto.
This is the i386 backend specific piece of my revised patch for
PR middle-end/98865, where Richard Biener has suggested that I perform
the desired transformation during RTL expansion where the backend can
control whether it is profitable to convert a multiplication into a
bit-wise AND and a negation. This works well for x86_64, but alas
exposes a latent bug with -m32, where a DImode multiplication incorrectly
appears to be cheaper than negdi2+anddi3(!?). The fix to ix86_rtx_costs
is to report that a DImode (multi-word) multiplication actually requires
three SImode multiplications and two SImode additions. This also corrects
the cost of TImode multiplication on TARGET_64BIT.
2022-05-18 Roger Sayle <roger@nextmovesoftware.com>
gcc/ChangeLog
* config/i386/i386.cc (ix86_rtx_costs) [MULT]: When mode size
is wider than word_mode, a multiplication costs three word_mode
multiplications and two word_mode additions.
The x86 instruction encoding for SImode andn is longer than the
equivalent notl/andl sequence when the source for the not operand
is the same register as the destination. This patch adds post_reload
splitters to i386.md to avoid "-mbmi" (which enables andn) increasing
code size with "-Oz".
One minor subtlety with this patch is that the splitter for
*andn_si_ccno swaps the order of operands (match_dup 2 and match_dup 3)
as memory operands need to appear first in *test<mode>_1 patterns.
2022-05-18 Roger Sayle <roger@nextmovesoftware.com>
gcc/ChangeLog
* config/i386/i386.md (define_split): Split *andsi_1
and *andn_si_ccno after reload with -Oz.
gcc/testsuite/ChangeLog
* gcc.target/i386/bmi-andn-3.c: New test case.
This PR complains that we emit the "enumeration value not handled in
switch" warning even though the enumerator was marked with the
[[maybe_unused]] attribute.
I couldn't just check TREE_USED, because the enumerator could have been
used earlier in the function, which doesn't play well with the
c_do_switch_warnings warning. Instead, I had to check the attributes on
the CONST_DECL. This is easy since the TYPE_VALUES of an enum type are
now consistent between C and C++, both of which store the CONST_DECL in
its TREE_VALUE.
PR c++/105497
gcc/c-family/ChangeLog:
* c-warn.cc (c_do_switch_warnings): Don't warn about unhandled
enumerator when it was marked with attribute unused.
gcc/testsuite/ChangeLog:
* c-c++-common/Wswitch-1.c: New test.
* g++.dg/warn/Wswitch-4.C: New test.
Here we crash because we attempt to % by 0. Thus fixed.
While at it, I've moved the -Wclass-memaccess tests into warn/.
I've checked that the # of expected passes is the same before/after
the move.
PR c++/105634
gcc/cp/ChangeLog:
* call.cc (maybe_warn_class_memaccess): Avoid % by zero.
gcc/testsuite/ChangeLog:
* g++.dg/Wclass-memaccess-2.C: Moved to...
* g++.dg/warn/Wclass-memaccess-2.C: ...here.
* g++.dg/Wclass-memaccess-3.C: Moved to...
* g++.dg/warn/Wclass-memaccess-3.C: ...here.
* g++.dg/Wclass-memaccess-4.C: Moved to...
* g++.dg/warn/Wclass-memaccess-4.C: ...here.
* g++.dg/Wclass-memaccess-5.C: Moved to...
* g++.dg/warn/Wclass-memaccess-5.C: ...here.
* g++.dg/Wclass-memaccess-6.C: Moved to...
* g++.dg/warn/Wclass-memaccess-6.C: ...here.
* g++.dg/Wclass-memaccess.C: Moved to...
* g++.dg/warn/Wclass-memaccess.C: ...here.
* g++.dg/warn/Wclass-memaccess-7.C: New test.
The problem is that subtypes are not part of the limited view of a package
so we need to use types in conjunction with limited_with clauses, which is
not always desirable as this yields less portable Ada bindings. The patch
also contains a small enhancement for complex floating-point types.
gcc/c-family/
* c-ada-spec.cc (dump_ada_node) <COMPLEX_TYPE>: Deal with usual
floating-point complex types.
<POINTER_TYPE>: Do not use limited_with clause if the designated
type is a scalar type.
Move pr83660.C to g++.target. As comment #3 of PR83660,
rename it to c isn't one option.
gcc/testsuite/ChangeLog:
* gcc.target/powerpc/pr83660.C: Moved to...
* g++.target/powerpc/pr83660.C: ...here.
Extend dump output to make understanding why Graphite rejects to
include a loop in a SCoP easier (for GCC developers).
gcc/ChangeLog:
* graphite-scop-detection.cc (scop_detection::can_represent_loop):
Output reason for failure to dump file.
(scop_detection::harmful_loop_in_region): Likewise.
(scop_detection::graphite_can_represent_expr): Likewise.
(scop_detection::stmt_has_simple_data_refs_p): Likewise.
(scop_detection::stmt_simple_for_scop_p): Likewise.
(print_sese_loop_numbers): New function.
(scop_detection::add_scop): Use from here.
gcc/testsuite/ChangeLog:
* gcc.dg/graphite/scop-22a.c: New test.
Module demangling requires some changes in how substitutions are
handled. This adjusts things to make that possible.
libiberty/
* cp-demangle.c (d_name): Add SUBSTABLE parameter,
push substitution if requested. Adjust unscoped name handling.
(d_prefix): Reorder main loop. Adjust all calls.
(d_unqualified_name): Add SCOPE parameter, create qualified
name here. Adjust all calls.
(cplus_demangle_type): Do not handle 'S' here, leave all
to d_class_enum_type.
(d_class_enum_type): Add SUBSTABLE parameter.
Update to provers caused some proof regressions. Fix the proof by
adding an assertion.
gcc/ada/
* libgnat/s-imageu.adb (Set_Image_Unsigned): Change assertion.
Fix compilation warning. The code was using a cast to struct sigcontext
*, which doesn't exist. It worked by accident.
gcc/ada/
* sigtramp-qnx.c: Change struct sigcontext * to mcontext_t *.
After changes in Why3 and generation of VCs, ghost code needs to be
adapted for proofs to remain automatic.
gcc/ada/
* libgnat/s-aridou.adb (Big3): Change return type.
(Lemma_Mult_Non_Negative, Lemma_Mult_Non_Positive): Reorder
alphabetically.
(Lemma_Concat_Definition, Lemma_Double_Big_2xxsingle): New
lemmas.
(Double_Divide, Scaled_Divide): Add assertions.
Update to provers caused some proof regressions. Fix the proof by
changing ghost code.
gcc/ada/
* libgnat/s-valueu.adb (Scan_Raw_Unsigned): Add assertions.
Calls to various Vet functions are used throughout the containers
packages to check internal consistency. This patch improves efficiency
by disabling these calls when Container_Checks are suppressed.
gcc/ada/
* libgnat/a-crbtgo.ads, libgnat/a-rbtgbo.ads,
libgnat/a-cbdlli.adb, libgnat/a-cbhama.adb,
libgnat/a-cbhase.adb, libgnat/a-cdlili.adb,
libgnat/a-cfdlli.adb, libgnat/a-cfhama.adb,
libgnat/a-cfhase.adb, libgnat/a-cidlli.adb,
libgnat/a-cihama.adb, libgnat/a-cihase.adb,
libgnat/a-cohama.adb, libgnat/a-cohase.adb,
libgnat/a-crbtgo.adb, libgnat/a-crdlli.adb, libgnat/a-rbtgbo.adb
(Vet): Make the Vet functions do nothing when
Container_Checks'Enabled is False, and inline them, so the calls
disappear when optimizing.
Currently, a 64-bit gnatsymbolize fails to output line numbers and
accurate symbol names when run on 32-bit executables (and vice-versa).
This is because a couple of spots in System.Dwarf_Lines expect the
Address_Size found in the DWARF data to match the host Address'Size.
This patch corrects that assumption.
gcc/ada/
* libgnat/s-dwalin.adb (Aranges_Lookup, Enable_Cache): Adapt to
changes in the signature of Read_Aranges_*.
(Debug_Info_Lookup): Do not control address size read from
DWARF.
(Read_Aranges_Header): Do not control address size read from
DWARF; return this size.
(Read_Aranges_Entry): Use the size returned by
Read_Aranges_Header.
The error message issued for use of GNAT extension features without
specifying -gnatX (or pragma Extensions_Allowed) was confusing in the
presence of a pragma specifying a language version (such as "pragma
Ada_2022;"), because the pragma supersedes the switch. The message is
improved by testing for use of such a pragma, plus use of pragma
Extensions_Allowed is now suggested, and several cases are changed to
call the common error procedure for flagging uses of extension features.
gcc/ada/
* errout.ads (Error_Msg_GNAT_Extension): Add formal Loc and
revise comment.
* errout.adb (Error_Msg_GNAT_Extension): Condition message on
the flag Ada_Version_Pragma, and add suggestion to use of pragma
Extensions_Allowed in messages.
* par-ch3.adb, par-ch5.adb, par-ch6.adb, par-ch11.adb,
par-ch12.adb: Add actual Token_Ptr on calls to
Error_Msg_GNAT_Extension.
* par-ch4.adb: Change Error_Msg to Error_Msg_GNAT_Extension for
error calls related to use of extension features.
* sem_ch13.adb: Likewise.
The conversion between OS and Ada priorties should be done in the wider
Interfaces.C.int type rather than Any_Priority otherwise
Constraint_Error will be raised when coverting Any_Priority'Last to int.
gcc/ada/
* libgnarl/s-osinte__qnx.adb (To_Target_Priority): Perform
arithmetic in int.
When a tagged type T has aspect String_Literal, a derived type defines a
null extension T2, and the context to resolve the use of an object of
type T2 where the string literal is applicable is a class-wide type the
frontend crashes trying to evaluate if the object is a null extension.
This problem does not reproduce when the compiler is built with
assertions disabled.
gcc/ada/
* sem_ch6.adb (Find_Corresponding_Spec): Avoid calling
Is_Null_Extension with a class-wide type entity.
(Overrides_Visible_Function): Handle alias entities.
* sem_res.adb (Has_Applicable_User_Defined_Literal): Conversion
not needed if the result type of the call is class-wide or if
the result type matches the context type.
* sem_util.ads (Is_Null_Extension): Adding documentation.
(Is_Null_Extension_Of): Adding documentation.
* sem_util.adb (Is_Null_Extension): Adding assertion.
(Is_Null_Extension_Of): Adding assertions.
gcc/ada/
* snames.ads-tmpl (Name_Index): New attribute name.
(Attribute_Id): Adding Attribute_Index as regular attribute.
* sem_attr.adb (Attribute_22): Adding Attribute_Index as Ada
2022 attribute.
(Analyze_Index_Attribute): Check that 'Index appears in a
pre-/postcondition aspect or pragma associated with an entry
family.
(Analyze_Attribute): Adding semantic analysis for 'Index.
(Eval_Attribute): Register 'Index as can never be folded.
(Resolve_Attribute): Resolve attribute 'Index.
* sem_ch9.adb (Check_Wrong_Attribute_In_Postconditions): New
subprogram.
(Analyze_Requeue): Check that the requeue target shall not have
an applicable specific or class-wide postcondition which
includes an Index attribute reference.
* exp_attr.adb (Expand_N_Attribute_Reference): Transform
attribute Index into a renaming of the second formal of the
wrapper built for an entry family that has contract cases.
* einfo.ads (Is_Entry_Wrapper): Complete documentation.
This ACATS test shows that we need to call Is_Immutably_Limited_Type
in Analyze_Function_Return and also that we have a latent bug in
Is_Immutably_Limited_Type which shouldn't look through private types.
gcc/ada/
* sem_aux.adb (Is_Immutably_Limited_Type): Do not look through
private types as per RM 7.5(8.1).
* sem_ch6.adb (Analyze_Function_Return): Use
Is_Immutably_Limited_Type as per RM 6.5(5.10).
In Ada 2022, delta aggregate must use parentheses not square brackets
except array delta aggregates.
gcc/ada/
* gen_il-gen-gen_nodes.adb (Gen_IL.Gen.Gen_Nodes): Add
Is_Homogeneous_Aggregate field for N_Delta_Aggregate nodes.
* par-ch4.adb (P_Aggregate_Or_Paren_Expr): Minor reformatting.
* sem_aggr.adb (Resolve_Delta_Aggregate): Reject square brackets
for record aggregate.
(Resolve_Record_Aggregate): Uniformise error message.
The simple use of Ada.Tags triggers a dependency on the secondary stack
mechanism, which is unwanted on small embedded targets. To avoid this
dependency, we special case a-tags.ali in ALI.Scan_ALI to not set
Sec_Stack_Used. If some other code calls one of the functions returning
a string, this code will also be marked as requiring the secondary
stack. We also remove the need to import and set __gnat_binder_ss_count
in this case by ensuring this variable defaults to 0.
gcc/ada/
* ali.adb (Scan_ALI): Special case a-tags.ali when setting
Sec_Stack_Used.
* bindgen.adb (Gen_Adainit): Simplify handling of secondary
stack related code, and only import __gnat_binder_ss_count when
needed.
* libgnat/s-secsta.adb (Binder_SS_Count): Default initialize to
0.
We need a couple of guards for boundary conditions in the support code.
gcc/ada/
* libgnat/s-dourea.adb ("/"): Add guard for zero and infinite
divisor.
* libgnat/s-valuer.adb (Scan_Raw_Real): Add guard for very large
exponent values.
SPARK RM 7.7(8) mandates that the freezing point of a tagged type must
occur within the so-called early call region of all its primitives.
This check may lead to spurious errors due to generated constructs being
considered in the search for the start of the early call region.
gcc/ada/
* sem_elab.adb (Is_Suitable_Construct): Fix for generated
constructs.
When an object declaration is initialized with a type conversion:
Var : Typ := Typ (Value);
we skip the check for Typ's predicate as it is already checked
during the type conversion.
This is not correct when Var's subtype and the target subtype of the
conversion do not statically match:
Var : Typ := OtherTyp (Value);
In such case, we can't skip the check of Typ's predicate.
Fix minor typos in comment.
gcc/ada/
* sem_ch3.adb (Analyze_Object_Declaration): Skip predicate check
for type conversion if object's subtype and expression's subtype
statically match.
* exp_prag.adb (Expand_Pragma_Check): Typo fix in comment.
The compiler builds renamings for actuals of formal objects for debugging
purposes in this case, but it must not generate them for temporaries.
gcc/ada/
* exp_dbug.ads (Build_Subprogram_Instance_Renamings): Fix typo.
* exp_dbug.adb (Build_Subprogram_Instance_Renamings): Build the
renaming only for actuals of formal objects.
When a derived type DT has an untagged private parent type PT with a
discriminant, where the full type of PT is tagged, and DT inherits a
function F with an anonymous access result that designates the type, the
compiler wrongly reports an error saying that DT must be declared
abstract or F overridden. A test is added to exclude checking the
abstract overriding rules that should only apply to inherited
subprograms of tagged derived types.
gcc/ada/
* sem_ch3.adb (Check_Abstract_Overriding): If the type is
derived from an untagged type, then don't perform any of the
abstract overriding error checks.
When computing size of a static aggregate to decide if it should be
transformed into assignments and loops we could have an overflow check.
This is mostly harmless, because colossal aggregates will likely crash
the application anyway, no matter how we transform them.
This was not detected because compiler was built with -gnatg switch that
suppresses overflow checks (they are only enabled by an explicit -gnato
switch).
gcc/ada/
* exp_aggr.adb (Component_Count): Calculate size as an Uint and
only then check if it is in the range of Int, as otherwise the
multiplication of Int values can overflow.
This adds a package renaming unit to the GNAT hierarchy so as to expose
the underlying implementation of floating-point mathematical functions,
thus also making it possible to use their vector implementation, if any.
The change also contains a small improvement to the Hide_Public_Entities
mechanism in Sem_Ch7 that makes it possible to clear the Is_Public flag
within instances of generic packages that do not have a body.
gcc/ada/
* Makefile.rtl (GNATRTL_NONTASKING_OBJS): Add g-gfmafu$(objext).
(SIMD_PATH_TARGET_PAIRS): New variable.
(TRASYM_DWARF_COMMON_OBJS): Minor tweak.
(x86-64/Linux): Use SIMD_PATH_TARGET_PAIRS.
(x32/Linux): Likewise.
* doc/gnat_rm/the_gnat_library.rst (Generic_Fast_Math_Functions):
New entry.
* gnat_rm.texi: Regenerate.
* impunit.adb (Non_Imp_File_Names_95): Add g-gfmafu.
* sem_ch7.adb (Has_Referencer): Do not set In_Nested_Instance for
instances of generic packages that do not have a body.
* libgnat/a-nalofl__simd.ads: New SIMD-enabled version.
* libgnat/a-nuaufl__simd.ads: Likewise.
* libgnat/g-gfmafu.ads: New package renaming unit.
Should_Freeze_Type is relaxed to only take the relevant case into
account (entities denoted by generic actual parameters as per
13.14(5/3), as well as profile of any subprograms named as per
13.14(10.2/4)), instead of being overly conservative wrt instances and
as a result, wrongly rejecting some legal code.
In practice this means we only need to worry about profile of
subprograms named as part of instances.
gcc/ada/
* freeze.adb (Should_Freeze_Type): Fix handling of freezing in
instances.
The Analyze_Associations.Check_Generic_Parent function was using an
incorrect node as the instanciation node for the actual, possibly
leading to incorrect freeze node being created (and later crashing in
gigi). Using Get_Unit_Instantiation_Node fixes the issue.
gcc/ada/
* sem_ch12.adb (Check_Generic_Parent): Use
Get_Unit_Instantiation_Node instead of Next.
Since we import the elemental math functions as intrinsics, it's not
accurate to state we're drawing them in from the C math library.
gcc/ada/
* libgnat/a-nagefl.ads: Replace mentions of C/unix math library
with intrinsics.
* libgnat/a-nallfl.ads: Likewise. State compatibility
requirements.
* libgnat/a-nalofl.ads: Likewise.
* libgnat/a-nuaufl.ads: Likewise.
This avoids a useless walk of the prefix chain in instances.
gcc/ada/
* sem_ch8.adb (Analyze_Subprogram_Renaming): Move final test on
In_Instance to outer condition.
The QNX system specs for ARM and AARCH64 are identical. It makes more
sense to have it named for the base architecture.
gcc/ada/
* Makefile.rtl: Rename system-qnx-aarch64.ads to
system-qnx-arm.ads.
(AARCH64 QNX section): Modify to handle both arm and arch64.
* tracebak.c (__QNX__): Add new __ARMEL__ section.
* sigtramp-arm-qnx.c: New file.
* libgnat/system-qnx-aarch64.ads: Renamed to ...
* libgnat/system-qnx-arm.ads: this.
gcc/ChangeLog:
PR target/104610
* config/i386/i386-expand.cc (ix86_expand_branch): Use ptest
for QImode when code is EQ or NE.
* config/i386/i386.md (cbranchoi4): New expander.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr104610.c: New test.
When optimizing the DGEMM kernel in OpenBLAS to use MMA, the MMA code
uses all 8 accumulators, which overlap all vs0-vs31 vector registers.
Current trunk assigns one of the normal vector inputs to one of the MMA
instructions, which forces us to spill one of the accumulators to memory,
leading to poor performance. The solution here is to replace the "wa"
constraints for the vector input operands in the MMA instruction patterns
with "v,?wa" so that we prefer using the altivec registers vs32-vs63
over the vs0-vs31 registers.
2022-05-17 Peter Bergner <bergner@linux.ibm.com>
Segher Boessenkool <segher@kernel.crashing.org>
gcc/
PR target/105556
* config/rs6000/mma.md (mma_<vv>, mma_<avv>, mma_<pv>, mma_<apv>,
mma_<vvi4i4i8>, mma_<avvi4i4i8>, mma_<vvi4i4i2>, mma_<avvi4i4i2>,
mma_<vvi4i4>, mma_<avvi4i4>, mma_<pvi4i2>, mma_<apvi4i2>,
mma_<vvi4i4i4>, mma_<avvi4i4i4>): Replace "wa" constraints with "v,?wa".
Update other operands accordingly.
