gcc/
2020-09-11 Michael Meissner <meissner@linux.ibm.com>
* config/rs6000/rs6000.c (rs6000_maybe_emit_maxc_minc): Rename
from rs6000_emit_p9_fp_minmax. Change return type to bool. Add
comments to document NaN/signed zero behavior.
(rs6000_maybe_emit_fp_cmove): Rename from rs6000_emit_p9_fp_cmove.
(have_compare_and_set_mask): New helper function.
(rs6000_emit_cmove): Update calls to new names and the new helper
function.
I discovered that we'd accept constraints on block-scope function
decls inside templates. This fixes that.
gcc/cp/
* decl.c (grokfndecl): Don't attach to local extern.
Hi,
As reported, the recently added pr96139 tests will fail on older targets
because the tests are missing the appropriate -mvsx or -maltivec options.
This adds the options and clarifies the dg-require statements.
The pr96139-c.c test needs -maltivec to work, but does not actually use
vectors, so does not require -mvsx like the others.
Sniff-regtested OK when specifying older targets on a power7 host.
--target_board=unix/'{-mcpu=power4,-mcpu=power5,-mcpu=power6,-mcpu=power7,
-mcpu=power8,-mcpu=power9}''{-m64,-m32}'"
gcc/testsuite/ChangeLog:
* gcc.target/powerpc/pr96139-a.c: Specify -mvsx option and update the
dg-require stanza to match.
* gcc.target/powerpc/pr96139-b.c: Same.
* gcc.target/powerpc/pr96139-c.c: Specify -maltivec option and update
the dg-require stanza to match.
We would like to be able to use std::align and std::assume_aligned
without pulling in everything in <memory>.
libstdc++-v3/ChangeLog:
* include/Makefile.am (bits_headers): Add new header.
* include/Makefile.in: Regenerate.
* include/bits/align.h: New file.
* include/std/memory (align): Move definition to bits/align.h.
(assume_aligned): Likewise.
In C++11 constexpr functions can only have a return statement, so we
need to fix __detail::ceil to make it valid in C++11. This can be done
by moving the comparison and increment into a new function, __ceil_impl,
and calling that with the result of the duration_cast.
This would mean the standard C++17 std::chrono::ceil function would make
two further calls, which would add too much overhead when not inlined.
For C++17 and later use a using-declaration to add chrono::ceil to
namespace __detail. For C++11 and C++14 define chrono::__detail::__ceil
as a C++11-compatible constexpr function template.
libstdc++-v3/ChangeLog:
* include/std/chrono [C++17] (chrono::__detail::ceil): Add
using declaration to make chrono::ceil available for internal
use with a consistent name.
(chrono::__detail::__ceil_impl): New function template.
(chrono::__detail::ceil): Use __ceil_impl to compare and
increment the value. Remove SFINAE constraint.
These tests are written for 256 bit vector. For -march=cascadelake,
vector size changed to 512 bit. It doubles the number of fma
instruction and test fail. Fix is to explicitly disable 512 bit
vector by passing additional option -mno-avx512f.
Tested on x86-64.
gcc/testsuite/ChangeLog:
PR target/97018
* gcc.target/i386/l_fma_double_1.c: Add option -mno-avx512f.
* gcc.target/i386/l_fma_double_2.c: Likewise.
* gcc.target/i386/l_fma_double_3.c: Likewise.
* gcc.target/i386/l_fma_double_4.c: Likewise.
* gcc.target/i386/l_fma_double_5.c: Likewise.
* gcc.target/i386/l_fma_double_6.c: Likewise.
* gcc.target/i386/l_fma_float_1.c: Likewise.
* gcc.target/i386/l_fma_float_2.c: Likewise.
* gcc.target/i386/l_fma_float_3.c: Likewise.
* gcc.target/i386/l_fma_float_4.c: Likewise.
* gcc.target/i386/l_fma_float_5.c: Likewise.
* gcc.target/i386/l_fma_float_6.c: Likewise.
Syntax errors in method definition lists could leave us in a function
scope. My recent change for block scope externs didn't like that.
This reimplements the parsing loop to finish the method definition we
started. AFAICT the original code was attempting to provide some
error recovery. Also while there, simply do the token peeking at the
top of the loop, rather than at the two(!) ends.
gcc/cp/
* parser.c (cp_parser_objc_method_definition_list): Reimplement
loop, make sure we pop scope.
gcc/testsuite/
* obj-c++.dg/syntax-error-9.mm: Adjust expected errors.
Since we now have DECL_DECLARED_CONSTINIT_P, we no longer need
LOOKUP_CONSTINIT.
gcc/cp/ChangeLog:
* cp-tree.h (LOOKUP_CONSTINIT): Remove.
(LOOKUP_REWRITTEN): Adjust.
* decl.c (duplicate_decls): Set DECL_DECLARED_CONSTINIT_P.
(check_initializer): Use DECL_DECLARED_CONSTINIT_P instead of
LOOKUP_CONSTINIT.
(cp_finish_decl): Don't set DECL_DECLARED_CONSTINIT_P. Use
DECL_DECLARED_CONSTINIT_P instead of LOOKUP_CONSTINIT.
(grokdeclarator): Set DECL_DECLARED_CONSTINIT_P.
* decl2.c (grokfield): Don't handle LOOKUP_CONSTINIT.
* parser.c (cp_parser_decomposition_declaration): Remove
LOOKUP_CONSTINIT handling.
(cp_parser_init_declarator): Likewise.
* pt.c (tsubst_expr): Likewise.
(instantiate_decl): Likewise.
* typeck2.c (store_init_value): Use DECL_DECLARED_CONSTINIT_P instead
of LOOKUP_CONSTINIT.
The fix for PR68519 in 83fd5e73b3 only
applied to condition_variable::wait_for. This problem can also apply to
condition_variable::wait_until but only if the custom clock is using a
more recent epoch so that a small enough delta can be calculated. let's
use the newly-added chrono::__detail::ceil to fix this and also make use
of that function to simplify the previous wait_for fixes.
Also, simplify the existing test case for PR68519 a little and make its
variables local so we can add a new test case for the above problem.
Unfortunately, the test would have only started failing if sufficient
time has passed since the chrono::steady_clock epoch had passed anyway,
but it's better than nothing.
libstdc++-v3/ChangeLog:
* include/std/condition_variable (condition_variable::wait_until):
Convert delta to steady_clock duration before adding to current
steady_clock time to avoid rounding errors described in PR68519.
(condition_variable::wait_for): Simplify calculation of absolute
time by using chrono::__detail::ceil in both overloads.
* testsuite/30_threads/condition_variable/members/68519.cc:
(test_wait_for): Renamed from test01. Replace unassigned val
variable with constant false. Reduce scope of mx and cv
variables to just test_wait_for function.
(test_wait_until): Add new test case.
Convert the specified duration to the target clock's duration type
before adding it to the current time in
__atomic_futex_unsigned::_M_load_when_equal_for and
_M_load_when_equal_until. This removes the risk of the timeout being
rounded down to the current time resulting in there being no wait at all
when the duration type lacks sufficient precision to hold the
steady_clock current time.
Rather than using the style of fix from PR68519, let's expose the C++17
std::chrono::ceil function as std::chrono::__detail::ceil so that it can
be used in code compiled with earlier standards versions and simplify
the fix. This was suggested by John Salmon in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91486#c5 .
This problem has become considerably less likely to trigger since I
switched the __atomic__futex_unsigned::__clock_t reference clock from
system_clock to steady_clock and added the loop, but the consequences of
triggering it have changed too.
By my calculations it takes just over 194 days from the epoch for the
current time not to be representable in a float. This means that
system_clock is always subject to the problem (with the standard 1970
epoch) whereas steady_clock with float duration only runs out of
resolution machine has been running for that long (assuming the Linux
implementation of CLOCK_MONOTONIC.)
The recently-added loop in
__atomic_futex_unsigned::_M_load_when_equal_until turns this scenario
into a busy wait.
Unfortunately the combination of both of these things means that it's
not possible to write a test case for this occurring in
_M_load_when_equal_until as it stands.
libstdc++-v3/ChangeLog:
PR libstdc++/91486
* include/bits/atomic_futex.h
(__atomic_futex_unsigned::_M_load_when_equal_for)
(__atomic_futex_unsigned::_M_load_when_equal_until): Use
__detail::ceil to convert delta to the reference clock
duration type to avoid resolution problems.
* include/std/chrono (__detail::ceil): Move implementation
of std::chrono::ceil into private namespace so that it's
available to pre-C++17 code.
* testsuite/30_threads/async/async.cc (test_pr91486):
Test __atomic_futex_unsigned::_M_load_when_equal_for.
If std::future::wait_until is passed a time point measured against a
clock that is neither std::chrono::steady_clock nor
std::chrono::system_clock then the generic implementation of
__atomic_futex_unsigned::_M_load_when_equal_until is called which
calculates the timeout based on __clock_t and calls the
_M_load_when_equal_until method for that clock to perform the actual
wait.
There's no guarantee that __clock_t is running at the same speed as the
caller's clock, so if the underlying wait times out timeout we need to
check the timeout against the caller's clock again before potentially
looping.
Also add two extra tests to the testsuite's async.cc:
* run test03 with steady_clock_copy, which behaves identically to
chrono::steady_clock, but isn't chrono::steady_clock. This causes
the overload of __atomic_futex_unsigned::_M_load_when_equal_until
that takes an arbitrary clock to be called.
* invent test04 which uses a deliberately slow running clock in order
to exercise the looping behaviour of
__atomic_futex_unsigned::_M_load_when_equal_until described above.
libstdc++-v3/ChangeLog:
* include/bits/atomic_futex.h
(__atomic_futex_unsigned::_M_load_when_equal_until): Add
loop on generic _Clock to check the timeout against _Clock
again after _M_load_when_equal_until returns indicating a
timeout.
* testsuite/30_threads/async/async.cc: Invent slow_clock
that runs at an eleventh of steady_clock's speed. Use it
to test the user-supplied-clock variant of
__atomic_futex_unsigned::_M_load_when_equal_until works
generally with test03 and loops correctly when the timeout
time hasn't been reached in test04.
The user-visible effect of this change is that std::future::wait_for now
uses std::chrono::steady_clock to determine the timeout. This makes it
immune to changes made to the system clock. It also means that anyone
using their own clock types with std::future::wait_until will have the
timeout converted to std::chrono::steady_clock rather than
std::chrono::system_clock.
Now that use of both std::chrono::steady_clock and
std::chrono::system_clock are correctly supported for the wait timeout, I
believe that std::chrono::steady_clock is a better choice for the reference
clock that all other clocks are converted to since it is guaranteed to
advance steadily. The previous behaviour of converting to
std::chrono::system_clock risks timeouts changing dramatically when the
system clock is changed.
libstdc++-v3/ChangeLog:
* include/bits/atomic_futex.h (__atomic_futex_unsigned): Change
__clock_t typedef to use steady_clock so that unknown clocks are
synced to it rather than system_clock. Change existing __clock_t
overloads of _M_load_and_text_until_impl and
_M_load_when_equal_until to use system_clock explicitly. Remove
comment about DR 887 since these changes address that problem as
best as we currently able.
The user-visible effect of this change is for std::future::wait_until to
use CLOCK_MONOTONIC when passed a timeout of std::chrono::steady_clock
type. This makes it immune to any changes made to the system clock
CLOCK_REALTIME.
Add an overload of __atomic_futex_unsigned::_M_load_and_text_until_impl
that accepts a std::chrono::steady_clock, and correctly passes this
through to __atomic_futex_unsigned_base::_M_futex_wait_until_steady
which uses CLOCK_MONOTONIC for the timeout within the futex system call.
These functions are mostly just copies of the std::chrono::system_clock
versions with small tweaks.
Prior to this commit, a std::chrono::steady timeout would be converted
via std::chrono::system_clock which risks reducing or increasing the
timeout if someone changes CLOCK_REALTIME whilst the wait is happening.
(The commit immediately prior to this one increases the window of
opportunity for that from a short period during the calculation of a
relative timeout, to the entire duration of the wait.)
FUTEX_WAIT_BITSET was added in kernel v2.6.25. If futex reports ENOSYS
to indicate that this operation is not supported then the code falls
back to using clock_gettime(2) to calculate a relative time to wait for.
I believe that I've added this functionality in a way that it doesn't
break ABI compatibility, but that has made it more verbose and less type
safe. I believe that it would be better to maintain the timeout as an
instance of the correct clock type all the way down to a single
_M_futex_wait_until function with an overload for each clock. The
current scheme of separating out the seconds and nanoseconds early risks
accidentally calling the wait function for the wrong clock.
Unfortunately, doing this would break code that compiled against the old
header.
libstdc++-v3/ChangeLog:
* config/abi/pre/gnu.ver: Update for addition of
__atomic_futex_unsigned_base::_M_futex_wait_until_steady.
* include/bits/atomic_futex.h (__atomic_futex_unsigned_base):
Add comments to clarify that _M_futex_wait_until and
_M_load_and_test_until use CLOCK_REALTIME.
(__atomic_futex_unsigned_base::_M_futex_wait_until_steady)
(__atomic_futex_unsigned_base::_M_load_and_text_until_steady):
New member functions that use CLOCK_MONOTONIC.
(__atomic_futex_unsigned_base::_M_load_and_test_until_impl)
(__atomic_futex_unsigned_base::_M_load_when_equal_until): Add
overloads that accept a steady_clock time_point and use the
new member functions.
* src/c++11/futex.cc: Include headers required for
clock_gettime.
(futex_clock_monotonic_flag): New constant to tell futex to
use CLOCK_MONOTONIC to match existing futex_clock_realtime_flag.
(futex_clock_monotonic_unavailable): New global to store the
result of trying to use CLOCK_MONOTONIC.
(__atomic_futex_unsigned_base::_M_futex_wait_until_steady): Add
new variant of _M_futex_wait_until that uses CLOCK_MONOTONIC to
support waiting using steady_clock.
The futex system call supports waiting for an absolute time if
FUTEX_WAIT_BITSET is used rather than FUTEX_WAIT. Doing so provides two
benefits:
1. The call to gettimeofday is not required in order to calculate a
relative timeout.
2. If someone changes the system clock during the wait then the futex
timeout will correctly expire earlier or later. Currently that only
happens if the clock is changed prior to the call to gettimeofday.
According to futex(2), support for FUTEX_CLOCK_REALTIME was added in the
v2.6.28 Linux kernel and FUTEX_WAIT_BITSET was added in v2.6.25. To
ensure that the code still works correctly with earlier kernel versions,
an ENOSYS error from futex[1] results in the
futex_clock_realtime_unavailable flag being set. This flag is used to
avoid the unnecessary unsupported futex call in the future and to fall
back to the previous gettimeofday and relative time implementation.
glibc applied an equivalent switch in pthread_cond_timedwait to use
FUTEX_CLOCK_REALTIME and FUTEX_WAIT_BITSET rather than FUTEX_WAIT for
glibc-2.10 back in 2009. See
glibc:cbd8aeb836c8061c23a5e00419e0fb25a34abee7
The futex_clock_realtime_unavailable flag is accessed using
std::memory_order_relaxed to stop it becoming a bottleneck. If the
first two calls to _M_futex_wait_until happen to happen simultaneously
then the only consequence is that both will try to use
FUTEX_CLOCK_REALTIME, both risk discovering that it doesn't work and, if
so, both set the flag.
[1] This is how glibc's nptl-init.c determines whether these flags are
supported.
libstdc++-v3/ChangeLog:
* src/c++11/futex.cc: Add new constants for required futex
flags. Add futex_clock_realtime_unavailable flag to store
result of trying to use FUTEX_CLOCK_REALTIME.
(__atomic_futex_unsigned_base::_M_futex_wait_until): Try to
use FUTEX_WAIT_BITSET with FUTEX_CLOCK_REALTIME and only
fall back to using gettimeofday and FUTEX_WAIT if that's not
supported.
Add tests for waiting for the future using both chrono::steady_clock and
chrono::system_clock in preparation for dealing with those clocks
properly in futex.cc.
libstdc++-v3/ChangeLog:
* testsuite/30_threads/async/async.cc (test02): Test steady_clock
with std::future::wait_until.
(test03): Add new test templated on clock type waiting for future
associated with async to resolve.
(main): Call test03 to test both system_clock and steady_clock.
When building with -fno-exceptions, bad_exception_allowed is set but
not used, causing a warning during the build.
This patch adds __attribute__((unused)) to avoid it.
2020-09-11 Torbjörn SVENSSON <torbjorn.svensson@st.com>
Christophe Lyon <christophe.lyon@linaro.org>
libstdc++-v3/
* libsupc++/eh_call.cc: Avoid warning with -fno-exceptions.
When building with -fno-exceptions, __throw_exception_again expands to
nothing, causing a "suggest braces around empty body in an 'if'
statement" warning.
This patch adds braces, like what was done in eh_personality.cc in svn
r193295 (git g:54ba39f599fc2f3d59fd3cd828a301ce9b731a20)
2020-09-11 Torbjörn SVENSSON <torbjorn.svensson@st.com>
Christophe Lyon <christophe.lyon@linaro.org>
libstdc++-v3/
* libsupc++/eh_call.cc: Avoid warning with -fno-exceptions.
The previous re-org made the cost of SLP vector stmts in loop
vectorization ignored. The following rectifies this mistake.
2020-09-11 Richard Biener <rguenther@suse.de>
PR tree-optimization/97020
* tree-vect-slp.c (vect_slp_analyze_operations): Apply
SLP costs when doing loop vectorization.
gcc/jit/ChangeLog
2020-08-01 Andrea Corallo <andrea.corallo@arm.com>
* docs/topics/compatibility.rst (LIBGCCJIT_ABI_14): New ABI tag.
* docs/topics/expressions.rst (gcc_jit_global_set_initializer):
Document new entry point in section 'Global variables'.
* jit-playback.c (global_new_decl, global_finalize_lvalue): New
method.
(playback::context::new_global): Make use of global_new_decl,
global_finalize_lvalue.
(load_blob_in_ctor): New template function in use by the
following.
(playback::context::new_global_initialized): New method.
* jit-playback.h (class context): Decl 'new_global_initialized',
'global_new_decl', 'global_finalize_lvalue'.
(lvalue::set_initializer): Add implementation.
* jit-recording.c (recording::memento_of_get_pointer::get_size)
(recording::memento_of_get_type::get_size): Add implementation.
(recording::global::write_initializer_reproducer): New function in
use by 'recording::global::write_reproducer'.
(recording::global::replay_into)
(recording::global::write_to_dump)
(recording::global::write_reproducer): Handle
initialized case.
* jit-recording.h (class type): Decl 'get_size' and
'num_elements'.
* libgccjit++.h (class lvalue): Declare new 'set_initializer'
method.
(class lvalue): Decl 'is_global' and 'set_initializer'.
(class global) Decl 'write_initializer_reproducer'. Add
'm_initializer', 'm_initializer_num_bytes' fields. Implement
'set_initializer'. Add a destructor to free 'm_initializer'.
* libgccjit.c (gcc_jit_global_set_initializer): New function.
* libgccjit.h (gcc_jit_global_set_initializer): New function
declaration.
* libgccjit.map (LIBGCCJIT_ABI_14): New ABI tag.
gcc/testsuite/ChangeLog
2020-08-01 Andrea Corallo <andrea.corallo@arm.com>
* jit.dg/all-non-failing-tests.h: Add test-blob.c.
* jit.dg/test-global-set-initializer.c: New testcase.
Add nvptx support to libatomic.
Given that atomic_test_and_set is not implemented for nvptx (PR96964), the
compiler translates __atomic_test_and_set falling back onto the "Failing all
else, assume a single threaded environment and simply perform the operation"
case in expand_atomic_test_and_set, so it doesn't map onto an actual atomic
operation.
Still, that counts as supported for the configure test of libatomic, so we
end up with HAVE_ATOMIC_TAS_1/2/4/8/16 == 1, and the corresponding
__atomic_test_and_set_1/2/4/8/16 in libatomic all using that non-atomic
implementation.
Fix this by adding an atomic_test_and_set expansion for nvptx, that uses
libatomics __atomic_test_and_set_1.
This again makes the configure tests for HAVE_ATOMIC_TAS_1/2/4/8/16 fail, so
instead we use this case in tas_n.c:
...
/* If this type is smaller than word-sized, fall back to a word-sized
compare-and-swap loop. */
bool
SIZE(libat_test_and_set) (UTYPE *mptr, int smodel)
...
which for __atomic_test_and_set_8 uses INVERT_MASK_8.
Add INVERT_MASK_8 in libatomic_i.h, as well as MASK_8.
Tested libatomic testsuite on nvptx.
gcc/ChangeLog:
PR target/96964
* config/nvptx/nvptx.md (define_expand "atomic_test_and_set"): New
expansion.
libatomic/ChangeLog:
PR target/96898
* configure.tgt: Add nvptx.
* libatomic_i.h (MASK_8, INVERT_MASK_8): New macro definition.
* config/nvptx/host-config.h: New file.
* config/nvptx/lock.c: New file.
This prevents execution failures caused by partially overlapping input and
output registers. This is the same solution already used for DImode.
gcc/ChangeLog:
* config/gcn/gcn.c (gcn_hard_regno_mode_ok): Align TImode registers.
* config/gcn/gcn.md: Assert that TImode registers do not early clobber.
This tries to improve BB vectorization dumps by providing more
precise locations. Currently the vect_location is simply the
very last stmt in a basic-block that has a location. So for
double a[4], b[4];
int x[4], y[4];
void foo()
{
a[0] = b[0]; // line 5
a[1] = b[1];
a[2] = b[2];
a[3] = b[3];
x[0] = y[0]; // line 9
x[1] = y[1];
x[2] = y[2];
x[3] = y[3];
} // line 13
we show the user with -O3 -fopt-info-vec
t.c:13:1: optimized: basic block part vectorized using 16 byte vectors
while with the patch we point to both independently vectorized
opportunities:
t.c:5:8: optimized: basic block part vectorized using 16 byte vectors
t.c:9:8: optimized: basic block part vectorized using 16 byte vectors
there's the possibility that the location regresses in case the
root stmt in the SLP instance has no location. For a SLP subgraph
with multiple entries the location also chooses one entry at random,
not sure in which case we want to dump both.
Still as the plan is to extend the basic-block vectorization
scope from single basic-block to multiple ones this is a first
step to preserve something sensible.
Implementation-wise this makes both costing and code-generation
happen on the subgraphs as analyzed.
2020-09-11 Richard Biener <rguenther@suse.de>
* tree-vectorizer.h (_slp_instance::location): New method.
(vect_schedule_slp): Adjust prototype.
* tree-vectorizer.c (vec_info::remove_stmt): Adjust
the BB region begin if we removed the stmt it points to.
* tree-vect-loop.c (vect_transform_loop): Adjust.
* tree-vect-slp.c (_slp_instance::location): Implement.
(vect_analyze_slp_instance): For BB vectorization set
vect_location to that of the instance.
(vect_slp_analyze_operations): Likewise.
(vect_bb_vectorization_profitable_p): Remove wrapper.
(vect_slp_analyze_bb_1): Remove cost check here.
(vect_slp_region): Cost check and code generate subgraphs separately,
report optimized locations and missed optimizations due to
profitability for each of them.
(vect_schedule_slp): Get the vector of SLP graph entries to
vectorize as argument.
This is a regression present on the mainline and 10 branch: the compiler
aborts on code accessing a component of a packed record type whose type
is a packed discriminated record type with variant part.
gcc/ada/ChangeLog:
* gcc-interface/utils.c (type_has_variable_size): New function.
(create_field_decl): In the packed case, also force byte alignment
when the type of the field has variable size.
gcc/testsuite/ChangeLog:
* gnat.dg/pack27.adb: New test.
* gnat.dg/pack27_pkg.ads: New helper.
This adds a missing stride entry for bit-packed arrays of record types.
gcc/ada/ChangeLog:
* gcc-interface/misc.c (get_array_bit_stride): Return TYPE_ADA_SIZE
for record and union types.
GDB can now deal with the DWARF representation just fine.
gcc/ada/ChangeLog:
* gcc-interface/misc.c (gnat_get_fixed_point_type): Bail out only
when the GNAT encodings are specifically used.
This is a regression present on mainline, 10 and 9 branches: the compiler
goes into an infinite recursion eventually exhausting the stack for the
declaration of a discriminated record type with an array component having
a discriminant as bound and an index type that is an enumeration type with
a non-standard representation clause.
gcc/ada/ChangeLog:
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Array_Subtype>: Only
create extra subtypes for discriminants if the RM size of the base
type of the index type is lower than that of the index type.
gcc/testsuite/ChangeLog:
* gnat.dg/specs/discr7.ads: New test.
This avoids dumping 'vectorization is not profitable' one more time
if none of the opportunities in a BB is profitable.
2020-09-11 Richard Biener <rguenther@suse.de>
PR tree-optimization/97013
* tree-vect-slp.c (vect_slp_analyze_bb_1): Remove duplicate dumping.
This fixes random things found when doing SLP discovery from
arbitrary sets of stmts.
2020-09-10 Richard Biener <rguenther@suse.de>
* tree-vect-slp.c (vect_build_slp_tree_1): Check vector
types for all lanes are compatible.
(vect_analyze_slp_instance): Appropriately check for stores.
(vect_schedule_slp): Likewise.
When nvptx_assemble_value is called with size == 16, this bitshift runs
into UB:
...
val &= ((unsigned HOST_WIDE_INT)2 << (size * BITS_PER_UNIT - 1)) - 1;
...
Fix this by checking the shift amount.
Tested on nvptx.
gcc/ChangeLog:
* config/nvptx/nvptx.c (nvptx_assemble_value): Fix undefined
behaviour.
This is a (hopefully temporary) fix to PR96791. This will make
the default be -mno-block-ops-vector-pair even on power10, so we will
not hit the issue of DSE trying to truncate a POImode register. I am
still concerned it will be possible to hit this because the MMA builtins
will also generate POImode stores, but I think any example of that will
be somewhat more contrived.
gcc/ChangeLog:
* config/rs6000/rs6000.c (rs6000_option_override_internal):
Change default.
Amongst other things PR analyzer/96798 notes that
region_model::on_call_pre treats any builtin that hasn't been coded
yet as a no-op (albeit with an unknown return value), which is wrong
for non-pure builtins.
This patch updates that function's handling of such builtins so that it
instead conservatively assumes that any escaped/reachable regions can
be affected by the call, and implements enough handling of specific
builtins to avoid regressing the testsuite (I hope).
gcc/analyzer/ChangeLog:
PR analyzer/96798
* region-model-impl-calls.cc (region_model::impl_call_memcpy):
New.
(region_model::impl_call_strcpy): New.
* region-model.cc (region_model::on_call_pre): Flag unhandled
builtins that are non-pure as having unknown side-effects.
Implement BUILT_IN_MEMCPY, BUILT_IN_MEMCPY_CHK, BUILT_IN_STRCPY,
BUILT_IN_STRCPY_CHK, BUILT_IN_FPRINTF, BUILT_IN_FPRINTF_UNLOCKED,
BUILT_IN_PUTC, BUILT_IN_PUTC_UNLOCKED, BUILT_IN_FPUTC,
BUILT_IN_FPUTC_UNLOCKED, BUILT_IN_FPUTS, BUILT_IN_FPUTS_UNLOCKED,
BUILT_IN_FWRITE, BUILT_IN_FWRITE_UNLOCKED, BUILT_IN_PRINTF,
BUILT_IN_PRINTF_UNLOCKED, BUILT_IN_PUTCHAR,
BUILT_IN_PUTCHAR_UNLOCKED, BUILT_IN_PUTS, BUILT_IN_PUTS_UNLOCKED,
BUILT_IN_VFPRINTF, BUILT_IN_VPRINTF.
* region-model.h (region_model::impl_call_memcpy): New decl.
(region_model::impl_call_strcpy): New decl.
gcc/testsuite/ChangeLog:
PR analyzer/96798
* gcc.dg/analyzer/memcpy-1.c: New test.
* gcc.dg/analyzer/strcpy-1.c: New test.
In doing the other work for adding ISA 3.1 128-bit minimum, maximum, and
conditional move support, I noticed the two functions that process conditional
moves return 'int' instead of 'bool'. This patch changes these functions to
return 'bool'.
gcc/
2020-09-10 Michael Meissner <meissner@linux.ibm.com>
* config/rs6000/rs6000-protos.h (rs6000_emit_cmove): Change return
type to bool.
(rs6000_emit_int_cmove): Change return type to bool.
* config/rs6000/rs6000.c (rs6000_emit_cmove): Change return type
to bool.
(rs6000_emit_int_cmove): Change return type to bool.
Currently, for this code from c-c++-common/spec-barrier-1.c:
...
__int128 g = 9;
...
we generate:
...
// BEGIN GLOBAL VAR DEF: g
.visible .global .align 8 .u64 g[2] = { 9, 9 };
...
and consequently the test-case fails in execution.
The problem is caused by a shift in nvptx_assemble_value:
...
val >>= part * BITS_PER_UNIT;
...
where the shift amount is equal to the number of bits in val, which is
undefined behaviour.
Fix this by detecting the situation and setting val to 0.
Tested on nvptx.
gcc/ChangeLog:
PR target/97004
* config/nvptx/nvptx.c (nvptx_assemble_value): Handle shift by
number of bits in shift operand.
When I've tried to backport recent LTO changes of mine, I've ran into
FAIL: g++.dg/ubsan/align-3.C -O2 -flto -fno-use-linker-plugin -flto-partition=none output pattern test
FAIL: g++.dg/ubsan/align-3.C -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects output pattern test
regressions that don't for some reason show up on the trunk.
I've tracked it down to input_location_and_block being called recursively,
first on some UBSAN_NULL ifn call's location which needs to stream a BLOCK
that hasn't been streamed yet, which in turn needs to stream some locations
for the decls in the BLOCK.
Looking at that align-3.C testcase on the trunk, I also see the recursive
lto_output_location_1 calls as well. First on block:
$18 = <block 0x7fffea738480>
which is in the block tree from what I can see just fine (see the end of
mail).
Now, output_function has code that should stream the BLOCK tree leafs:
/* Output DECL_INITIAL for the function, which contains the tree of
lexical scopes. */
stream_write_tree (ob, DECL_INITIAL (function), true);
/* As we do not recurse into BLOCK_SUBBLOCKS but only BLOCK_SUPERCONTEXT
collect block tree leafs and stream those. */
auto_vec<tree> block_tree_leafs;
if (DECL_INITIAL (function))
collect_block_tree_leafs (DECL_INITIAL (function), block_tree_leafs);
streamer_write_uhwi (ob, block_tree_leafs.length ());
for (unsigned i = 0; i < block_tree_leafs.length (); ++i)
stream_write_tree (ob, block_tree_leafs[i], true);
static void
collect_block_tree_leafs (tree root, vec<tree> &leafs)
{
for (root = BLOCK_SUBBLOCKS (root); root; root = BLOCK_CHAIN (root))
if (! BLOCK_SUBBLOCKS (root))
leafs.safe_push (root);
else
collect_block_tree_leafs (BLOCK_SUBBLOCKS (root), leafs);
}
but the problem is that it is broken, it doesn't cover all block leafs,
but only leafs with an odd depth from DECL_INITIAL (and only some of those).
The following patch fixes that, but I guess we are going to stream at that
point significantly more blocks than before (though I guess most of the time
we'd stream them later on when streaming the gimple_locations that refer to
them).
2020-09-10 Jakub Jelinek <jakub@redhat.com>
* lto-streamer-out.c (collect_block_tree_leafs): Recurse on
root rather than BLOCK_SUBBLOCKS (root).
Including <version> after <iterator> gives a warning about redefining
the __cpp_lib_array_constexpr macro. What happens is that <iterator>
sets the C++20 value, then <version> redefines it to the C++17 value,
then undefines it and defines it again to the C++20 value.
This change avoids defining it to the C++17 value when compiling C++20
or later (which also means we no longer need the #undef).
A similar warning happens for __cpp_lib_constexpr_char_traits when
including <version> after any header that includes <bits/char_traits.h>.
libstdc++-v3/ChangeLog:
* include/std/version (__cpp_lib_array_constexpr):
(__cpp_lib_constexpr_char_traits): Only define C++17 value when
compiling C++17.
libstdc++-v3/ChangeLog:
* include/experimental/bits/shared_ptr.h (shared_ptr(auto_ptr&&))
(operator=(auto_ptr&&)): Add diagnostic pragmas to suppress
warnings for uses of std::auto_ptr.
* include/experimental/type_traits (is_literal_type_v):
Likewise, for use of std::is_literal_type.
* include/std/condition_variable (condition_variable_any::_Unlock):
Likewise, for use of std::uncaught_exception.
Michael Meissner
Nathan Sidwell
Thomas Rodgers
Will Schmidt
Jonathan Wakely
Sunil K Pandey
Martin Sebor
Marek Polacek
Mike Crowe
Christophe Lyon
Richard Biener
Andrew Stubbs
Andrea Corallo
Tom de Vries
Eric Botcazou
Eric Botcazou
Aaron Sawdey
David Malcolm
GCC Administrator
Jakub Jelinek