This patch fixes the ICE caused by valid_to_unchecked_state,
at analyzer/sm-fd.cc by handling the m_start state in
check_for_dup.
Tested lightly on x86_64.
gcc/analyzer/ChangeLog:
PR analyzer/106551
* sm-fd.cc (check_for_dup): handle the m_start
state when transitioning the state of LHS
of dup, dup2 and dup3 call.
gcc/testsuite/ChangeLog:
* gcc.dg/analyzer/fd-dup-1.c: New testcases.
* gcc.dg/analyzer/fd-uninit-1.c: Remove bogus
warning.
Signed-off-by: Immad Mir <mirimmad@outlook.com>
Since r11-5188-g32934a4f45a721, we drop qualifiers during l-to-r
conversion by creating a NOP_EXPR. For e.g.
const int i = i;
that means that the DECL_INITIAL is '(int) i' and not 'i' anymore.
Consequently, we don't suppress_warning here:
711 case DECL_EXPR:
715 if (VAR_P (DECL_EXPR_DECL (*expr_p))
716 && !DECL_EXTERNAL (DECL_EXPR_DECL (*expr_p))
717 && !TREE_STATIC (DECL_EXPR_DECL (*expr_p))
718 && (DECL_INITIAL (DECL_EXPR_DECL (*expr_p)) == DECL_EXPR_DECL (*expr_p))
719 && !warn_init_self)
720 suppress_warning (DECL_EXPR_DECL (*expr_p), OPT_Winit_self);
because of the check on line 718 -- (int) i is not i. So -Wno-init-self
doesn't disable the warning as it's supposed to.
The following patch fixes it by moving the suppress_warning call from
c_gimplify_expr to the front ends, at points where we haven't created
the NOP_EXPR yet.
PR middle-end/102633
gcc/c-family/ChangeLog:
* c-gimplify.cc (c_gimplify_expr) <case DECL_EXPR>: Don't call
suppress_warning here.
gcc/c/ChangeLog:
* c-parser.cc (c_parser_initializer): Add new tree parameter. Use it.
Call suppress_warning.
(c_parser_declaration_or_fndef): Pass d down to c_parser_initializer.
(c_parser_omp_declare_reduction): Pass omp_priv down to
c_parser_initializer.
gcc/cp/ChangeLog:
* decl.cc (cp_finish_decl): Call suppress_warning.
gcc/testsuite/ChangeLog:
* c-c++-common/Winit-self1.c: New test.
* c-c++-common/Winit-self2.c: New test.
This avoids going BBs outside of the path when adding def chains
to the set of imports. It also syncs the code with
range_def_chain::get_def_chain to not miss out on some imports
this function would identify.
* gimple-range-path.cc (path_range_query::compute_imports):
Restrict walking SSA defs to blocks inside the path. Track
the same operands as range_def_chain::get_def_chain does.
This revisits how we compute imports later used for the ranger path
query during backwards threading. The compute_imports function
of the path solver ends up pulling the SSA def chain of regular
stmts without limit and since it starts with just the gori imports
of the path exit it misses some interesting names to translate
during path discovery. In fact with a still empty path this
compute_imports function looks like not the correct tool.
The following instead implements what it does during the path discovery
and since we add the exit block we seed the initial imports and
interesting names from just the exit conditional. When we then
process interesting names (aka imports we did not yet see the definition
of) we prune local defs but add their uses in a similar way as
compute_imports would have done.
compute_imports also is lacking in its walking of the def chain
compared to range_def_chain::get_def_chain which for example
handles &_1->x specially through range_op_handler and
gimple_range_operand1, so the code copies this. A fix for
compute_imports will be done separately, also fixing the unbound
walk there.
The patch also properly unwinds m_imports during the path discovery
backtracking and from a debugging session I have verified the two
sets evolve as expected now while previously behaving slightly erratic.
Fortunately the m_imports set now also is shrunken significantly for
the PR69592 testcase (aka PR106514) so that there's overall speedup
when increasing --param max-jump-thread-duplication-stmts as
15 -> 30 -> 60 -> 120 from 1s -> 2s -> 13s -> 27s to with the patch
1s -> 2s -> 4s -> 8s.
This runs into a latent issue in X which doesn't seem to expect
any PHI nodes with a constant argument on an edge inside the path.
But we now have those as interesting, for example for the ICEing
g++.dg/torture/pr100925.C which just has sth like
if (i)
x = 1;
else
x = 5;
if (x == 1)
...
where we now have the path from if (i) to if (x) and the PHI for x
in the set of imports to consider for resolving x == 1 which IMHO
looks exactly like what we want. The path_range_query::ssa_range_in_phi
papers over the issue and drops the range to varying instead of
crashing. I didn't want to mess with this any further in this patch
(but I couldn't resist replacing the loop over PHI args with
PHI_ARG_DEF_FROM_EDGE, so mind the re-indenting).
PR tree-optimization/106514
* tree-ssa-threadbackward.cc (back_threader::find_paths_to_names):
Compute and unwind both m_imports and interesting on the fly during
path discovery.
(back_threader::find_paths): Compute the original m_imports
from just the SSA uses of the exit conditional. Drop
handling single_succ_to_potentially_threadable_block.
* gimple-range-path.cc (path_range_query::ssa_range_in_phi): Handle
constant PHI arguments without crashing. Use PHI_ARG_DEF_FROM_EDGE.
* gcc.dg/tree-ssa/ssa-thread-19.c: Un-XFAIL.
* gcc.dg/tree-ssa/ssa-thread-20.c: New testcase.
These 2 tests were FAILing on i686-linux or e.g. with
--target_board=unix/-m32/-mno-sse on x86_64-linux due to
-Wpsabi warnings.
2022-08-11 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/106243
* gcc.dg/pr106243.c: Add -Wno-psabi to dg-options.
* gcc.dg/pr106243-1.c: Likewise.
These 2 tests were FAILing on i686-linux or e.g. with
--target_board=unix/-m32/-mno-sse on x86_64-linux due to
-Wpsabi warnings and also because dg-options in the latter
test has been ignored due to missing space, so even -O2
wasn't passed at all.
2022-08-11 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/104992
* gcc.dg/pr104992.c: Add -Wno-psabi to dg-options.
* g++.dg/pr104992-1.C: Likewise. Add space between " and } in
dg-options.
The following fixes the use of compute_imports from the backwards
threader which ends up accessing stale m_path from a previous
threading attempt. The fix is to pass in the path explicitely
(and not the exit), and initializing it with the exit around this
call from the backwards threader. That unfortunately exposed that
we rely on this broken behavior as the new testcase shows. The
missed threading can be restored by registering all relations
from conditions on the path during solving, for the testcase the
particular important case is for relations provided by the path
entry conditional.
I've verified that the GORI query for imported ranges on edges
is not restricted this way.
This regresses the new ssa-thread-19.c testcase which is exactly
a case for the other patch re-doing how we compute imports since
this misses imports for defs that are not on the dominating path
from the exit.
That's one of the cases this regresses (it also progresses a few
due to more or the correct relations added). Overall it
reduces the number of threads from 98649 to 98620 on my set of
cc1files. I think it's a reasonable intermediate step to find
a stable, less random ground to compare stats to.
* gimple-range-path.h (path_range_query::compute_imports):
Take path as argument, not the exit block.
* gimple-range-path.cc (path_range_query::compute_imports):
Likewise, and adjust, avoiding possibly stale m_path.
(path_range_query::compute_outgoing_relations): Register
relations for all conditionals.
* tree-ssa-threadbackward.cc (back_threader::find_paths):
Adjust.
* gcc.dg/tree-ssa/ssa-thread-18.c: New testcase.
* gcc.dg/tree-ssa/ssa-thread-19.c: Likewise, but XFAILed.
In function rs6000_init_builtins, there is a oversight that
in one target debugging hunk with TARGET_DEBUG_BUILTIN we
missed to handle enum bif_enable ENB_CELL. It's easy to
fix it by adding another if case. But considering the long
term maintainability, this patch updates it with the existing
function rs6000_builtin_is_supported, which centralizes the
related conditions for different enum bif_enable, we only
need to update that function once some condition needs to
be changed later. This also simplifies another usage in
function rs6000_expand_builtin.
gcc/ChangeLog:
* config/rs6000/rs6000-builtin.cc (rs6000_init_builtins): Fix the
oversight on ENB_CELL by simplifying with rs6000_builtin_is_supported.
(rs6000_expand_builtin): Simplify with rs6000_builtin_is_supported.
r10-631 had renamed rs6000_global_entry_point_needed_p to
rs6000_global_entry_point_prologue_needed_p. This is to
remove the stale function declaration.
gcc/ChangeLog:
* config/rs6000/rs6000-internal.h (rs6000_global_entry_point_needed_p):
Remove function declaration.
This fixes a mistake in typing a local variable in the symbolic
shift routine.
PR tree-optimization/106513
* gimple-ssa-store-merging.cc (do_shift_rotate): Use uint64_t
for head_marker.
* gcc.dg/torture/pr106513.c: New testcase.
My recently added testcase gcc.dg/fold-eqandshift-4.c, incorrectly assumed
that "char" was "signed char", and hence fails on powerpc64 where this
isn't the case. Fixed by making "signed char" explicit where needed in
this test. Committed as obvious.
2022-08-10 Roger Sayle <roger@nextmovesoftware.com>
gcc/testsuite/ChangeLog
PR other/106575
* gcc.dg/fold-eqandshift-4.c: Use "signed char" explicitly.
We were missing checks for uninitialized params on calls to functions
that the analyzer has hardcoded knowledge of - both for those that are
handled just by state machines, and for those that are handled in
region-model-impl-calls.cc (for those arguments for which the svalue
wasn't accessed in handling the call).
Fixed thusly.
gcc/analyzer/ChangeLog:
PR analyzer/106573
* region-model.cc (region_model::on_call_pre): Ensure that we call
get_arg_svalue on all arguments.
gcc/testsuite/ChangeLog:
PR analyzer/106573
* gcc.dg/analyzer/error-uninit.c: New test.
* gcc.dg/analyzer/fd-uninit-1.c: New test.
* gcc.dg/analyzer/file-uninit-1.c: New test.
Signed-off-by: David Malcolm <dmalcolm@redhat.com>
This x86_64 backend patch allows TImode STV to take advantage of the
fact that the PTEST instruction performs an AND operation. Previously
PTEST was (mostly) used for comparison against zero, by using the same
operands. The benefits are demonstrated by the new test case:
__int128 a,b;
int foo()
{
return (a & b) != 0;
}
Currently with -O2 -msse4 we generate:
movdqa a(%rip), %xmm0
pand b(%rip), %xmm0
xorl %eax, %eax
ptest %xmm0, %xmm0
setne %al
ret
with this patch we now generate:
movdqa a(%rip), %xmm0
xorl %eax, %eax
ptest b(%rip), %xmm0
setne %al
ret
Technically, the magic happens using new define_insn_and_split patterns.
Using two patterns allows this transformation to performed independently
of whether TImode STV is run before or after combine. The one tricky
case is that immediate constant operands of the AND behave slightly
differently between TImode and V1TImode: All V1TImode immediate operands
becomes loads, but for TImode only values that are not hilo_operands
need to be loaded. Hence the new *testti_doubleword accepts any
general_operand, but internally during split calls force_reg whenever
the second operand is not x86_64_hilo_general_operand. This required
(benefits from) some tweaks to TImode STV to support CONST_WIDE_INT in
more places, using CONST_SCALAR_INT_P instead of just CONST_INT_P.
2022-08-09 Roger Sayle <roger@nextmovesoftware.com>
gcc/ChangeLog
* config/i386/i386-features.cc (scalar_chain::convert_compare):
Create new pseudos only when/if needed. Add support for TEST,
i.e. (COMPARE (AND x y) (const_int 0)), using UNSPEC_PTEST.
When broadcasting V2DImode and V4SImode use new pseudo register.
(timode_scalar_chain::convert_op): Do nothing if operand is
already V1TImode. Avoid generating useless SUBREG conversions,
i.e. (SUBREG:V1TImode (REG:V1TImode) 0). Handle CONST_WIDE_INT
in addition to CONST_INT by using CONST_SCALAR_INT_P.
(convertible_comparison_p): Use CONST_SCALAR_INT_P to match both
CONST_WIDE_INT and CONST_INT. Recognize new *testti_doubleword
pattern as an STV candidate.
(timode_scalar_to_vector_candidate_p): Allow CONST_SCALAR_INT_P
operands in binary logic operations.
* config/i386/i386.cc (ix86_rtx_costs) <case UNSPEC>: Add costs
for UNSPEC_PTEST; a PTEST that performs an AND has the same cost
as regular PTEST, i.e. cost->sse_op.
* config/i386/i386.md (*testti_doubleword): New pre-reload
define_insn_and_split that recognizes comparison of TI mode AND
against zero.
* config/i386/sse.md (*ptest<mode>_and): New pre-reload
define_insn_and_split that recognizes UNSPEC_PTEST of identical
AND operands.
gcc/testsuite/ChangeLog
* gcc.target/i386/sse4_1-stv-8.c: New test case.
Following my middle-end patch for PR tree-optimization/94026, I'd promised
Jeff Law that I'd clean up the dead-code in fold-const.cc now that these
optimizations are handled in match.pd. Alas, I discovered things aren't
quite that simple, as the transformations I'd added avoided cases where
C2 overlapped with the new bits introduced by the shift, but the original
code handled any value of C2 provided that it had a single-bit set (under
the condition that C3 was always zero).
This patch upgrades the transformations supported by match.pd to cover
any values of C2 and C3, provided that C1 is a valid bit shift constant,
for all three shift types (logical right, arithmetic right and left).
This then makes the code in fold-const.cc fully redundant, and adds
support for some new (corner) cases not previously handled. If the
constant C1 is valid for the type's precision, the shift is now always
eliminated (with C2 and C3 possibly updated to test the sign bit).
Interestingly, the fold-const.cc code that I'm now deleting was originally
added by me back in 2006 to resolve PR middle-end/21137. I've confirmed
that those testcase(s) remain resolved with this patch (and I'll close
21137 in Bugzilla). This patch also implements most (but not all) of the
examples mentioned in PR tree-optimization/98954, for which I have some
follow-up patches.
2022-08-09 Roger Sayle <roger@nextmovesoftware.com>
Richard Biener <rguenther@suse.de>
gcc/ChangeLog
PR middle-end/21137
PR tree-optimization/98954
* fold-const.cc (fold_binary_loc): Remove optimizations to
optimize ((X >> C1) & C2) ==/!= 0.
* match.pd (cmp (bit_and (lshift @0 @1) @2) @3): Remove wi::ctz
check, and handle all values of INTEGER_CSTs @2 and @3.
(cmp (bit_and (rshift @0 @1) @2) @3): Likewise, remove wi::clz
checks, and handle all values of INTEGER_CSTs @2 and @3.
gcc/testsuite/ChangeLog
PR middle-end/21137
PR tree-optimization/98954
* gcc.dg/fold-eqandshift-4.c: New test case.
The macro definition for LIBGCCJIT_HAVE_gcc_jit_context_new_bitcast
was earlier located in the documentation comment for
gcc_jit_context_new_bitcast, making it unavailable to code that
consumed libgccjit.h. This commit moves the definition out of the
comment, making it effective.
gcc/jit/ChangeLog:
* libgccjit.h (LIBGCCJIT_HAVE_gcc_jit_context_new_bitcast): Move
definition out of comment.
Signed-off-by: David Malcolm <dmalcolm@redhat.com>
gcc/ChangeLog:
* doc/invoke.texi (Static Analyzer Options): Add notes on which
functions the analyzer has hardcoded knowledge of.
Signed-off-by: David Malcolm <dmalcolm@redhat.com>
Functions that are declared `pragma(inline)' should be treated as if
they are defined in every translation unit they are referenced from,
regardless of visibility protection. Ensure they always get
DECL_ONE_ONLY linkage, and start emitting them into other modules that
import them.
PR d/106563
gcc/d/ChangeLog:
* decl.cc (DeclVisitor::visit (FuncDeclaration *)): Set semanticRun
before generating its symbol.
(function_defined_in_root_p): New function.
(function_needs_inline_definition_p): New function.
(maybe_build_decl_tree): New function.
(get_symbol_decl): Call maybe_build_decl_tree before returning symbol.
(start_function): Use function_defined_in_root_p instead of inline
test for locally defined symbols.
(set_linkage_for_decl): Check for inline functions before private or
protected symbols.
gcc/testsuite/ChangeLog:
* gdc.dg/torture/torture.exp (srcdir): New proc.
* gdc.dg/torture/imports/pr106563math.d: New test.
* gdc.dg/torture/imports/pr106563regex.d: New test.
* gdc.dg/torture/imports/pr106563uni.d: New test.
* gdc.dg/torture/pr106563.d: New test.
Adjust the (unofficial) procedure calling ABI such that vector arguments are
passed in vector registers, not on the stack. Scalar arguments continue to
be passed in scalar registers, making a total of 12 argument registers.
The return value is also moved to a vector register (even for scalars; it
would be possible to retain the scalar location, using untyped_call, but
there's no obvious advantage in doing so).
After this change the ABI is as follows:
s0-s13 : Reserved for kernel launch parameters.
s14-s15 : Frame pointer.
s16-s17 : Stack pointer.
s18-s19 : Link register.
s20-s21 : Exec Save.
s22-s23 : CC Save.
s24-s25 : Scalar arguments. NO LONGER RETURN VALUE.
s26-s29 : Additional scalar arguments (makes 6 total).
s30-s31 : Static Chain.
v0 : Prologue/epilogue scratch.
v1 : Constant 0, 1, 2, 3, 4, ... 63.
v2-v7 : Prologue/epilogue scratch.
v8-v9 : Return value & vector arguments. NEW.
v10-v13 : Additional vector arguments (makes 6 total). NEW.
gcc/ChangeLog:
* config/gcn/gcn.cc (gcn_function_value): Allow vector return values.
(num_arg_regs): Allow vector arguments.
(gcn_function_arg): Likewise.
(gcn_function_arg_advance): Likewise.
(gcn_arg_partial_bytes): Likewise.
(gcn_return_in_memory): Likewise.
(gcn_expand_epilogue): Get return value from v8.
* config/gcn/gcn.h (RETURN_VALUE_REG): Set to v8.
(FIRST_PARM_REG): USE FIRST_SGPR_REG for clarity.
(FIRST_VPARM_REG): New.
(FUNCTION_ARG_REGNO_P): Allow vector parameters.
(struct gcn_args): Add vnum field.
(LIBCALL_VALUE): All vector return values.
* config/gcn/gcn.md (gcn_call_value): Add vector constraints.
(gcn_call_value_indirect): Likewise.
The following removes all excessive update_ssa calls from OMP
expansion, thereby rewriting the atomic load and store cases to
GIMPLE code generation. I don't think autopar ever exercises the
atomics code though.
There's not much test coverage overall so I've built SPEC 2k17
with -floop-parallelize-all -ftree-parallelize-loops=2 with and
without LTO (and otherwise -Ofast plus -march=haswell) without
fallout.
If there's any fallout it's not OK to update SSA form for
each and every OMP stmt lowered.
* omp-expand.cc (expand_omp_atomic_load): Emit GIMPLE
directly. Avoid update_ssa when in SSA form.
(expand_omp_atomic_store): Likewise.
(expand_omp_atomic_fetch_op): Avoid update_ssa when in SSA
form.
(expand_omp_atomic_pipeline): Likewise.
(expand_omp_atomic_mutex): Likewise.
* tree-parloops.cc (gen_parallel_loop): Use
TODO_update_ssa_no_phi after loop_version.
This removes max-fsm-thread-length which is obsoleted by
max-jump-thread-paths.
* doc/invoke.texi (max-fsm-thread-length): Remove.
* params.opt (max-fsm-thread-length): Likewise.
* tree-ssa-threadbackward.cc
(back_threader_profitability::profitable_path_p): Do not
check max-fsm-thread-length.
The following adds a limit for the exponential greedy search of
the backwards jump threader. The idea is to limit the search
space in a way that the paths considered are the same if the search
were in BFS order rather than DFS. In particular it stops considering
incoming edges into a block if the product of the in-degrees of
blocks on the path exceeds the specified limit.
When considering the low stmt copying limit of 7 (or 1 in the size
optimize case) this means the degenerate case with maximum search
space is a sequence of conditions with no actual code
B1
|\
| empty
|/
B2
|\
...
Bn
|\
GIMPLE_CONDs are costed 2, an equivalent GIMPLE_SWITCH already 4, so
we reach 7 already with 3 middle conditions (B1 and Bn do not count).
The search space would be 2^4 == 16 to reach this. The FSM threads
historically allowed for a thread length of 10 but is really looking
for a single multiway branch threaded across the backedge. I've
chosen the default of the new parameter to 64 which effectively
limits the outdegree of the switch statement (the cases reaching the
backedge) to that number (divided by 2 until I add some special
pruning for FSM threads due to the loop header indegree). The
testcase ssa-dom-thread-7.c requires 56 at the moment (as said,
some special FSM thread pruning of considered edges would bring
it down to half of that), but we now get one more threading
and quite some more in later threadfull. This testcase seems to
be difficult to check for expected transforms.
The new testcases add the degenerate case we currently thread
(without deciding whether that's a good idea ...) plus one with
an approripate limit that should prevent the threading.
This obsoletes the mentioned --param max-fsm-thread-length but
I am not removing it as part of this patch. When the search
space is limited the thread stmt size limit effectively provides
max-fsm-thread-length.
The param with its default does not help PR106514 enough to unleash
path searching with the higher FSM stmt count limit.
PR tree-optimization/106514
* params.opt (max-jump-thread-paths): New.
* doc/invoke.texi (max-jump-thread-paths): Document.
* tree-ssa-threadbackward.cc (back_threader::find_paths_to_names):
Honor max-jump-thread-paths, take overall_path argument.
(back_threader::find_paths): Pass 1 as initial overall_path.
* gcc.dg/tree-ssa/ssa-thread-16.c: New testcase.
* gcc.dg/tree-ssa/ssa-thread-17.c: Likewise.
* gcc.dg/tree-ssa/ssa-dom-thread-7.c: Adjust.
gcc/ChangeLog:
PR middle-end/106492
* omp-low.cc (lower_rec_input_clauses): Add missing folding
to data type of linear-clause list item.
gcc/testsuite/ChangeLog:
PR middle-end/106492
* g++.dg/gomp/pr106492.C: New test.
Processing of a cond_expr requires that a range of the correct type for the
operands of the cond_expr is passed in.
PR tree-optimization/106556
gcc/
* gimple-range-gori.cc (gori_compute::condexpr_adjust): Use the
type of the cond_expr operands being evaluted.
gcc/testsuite/
* gfortran.dg/pr106556.f90: New.
This patch corrects handling of UTF-8 character literals in preprocessing
directives so that they are treated as unsigned types in char8_t enabled
C++ modes (C++17 with -fchar8_t or C++20 without -fno-char8_t). Previously,
UTF-8 character literals were always treated as having the same type as
ordinary character literals (signed or unsigned dependent on target or use
of the -fsigned-char or -funsigned char options).
PR preprocessor/106426
gcc/c-family/ChangeLog:
* c-opts.cc (c_common_post_options): Assign cpp_opts->unsigned_utf8char
subject to -fchar8_t, -fsigned-char, and/or -funsigned-char.
gcc/testsuite/ChangeLog:
* g++.dg/ext/char8_t-char-literal-1.C: Check signedness of u8 literals.
* g++.dg/ext/char8_t-char-literal-2.C: Check signedness of u8 literals.
libcpp/ChangeLog:
* charset.cc (narrow_str_to_charconst): Set signedness of CPP_UTF8CHAR
literals based on unsigned_utf8char.
* include/cpplib.h (cpp_options): Add unsigned_utf8char.
* init.cc (cpp_create_reader): Initialize unsigned_utf8char.
This patch implements the core language and compiler dependent library
changes adopted for C2X via WG14 N2653. The changes include:
- Change of type for UTF-8 string literals from array of const char to
array of const char8_t (unsigned char).
- A new atomic_char8_t typedef.
- A new ATOMIC_CHAR8_T_LOCK_FREE macro defined in terms of the existing
__GCC_ATOMIC_CHAR8_T_LOCK_FREE predefined macro.
gcc/ChangeLog:
* ginclude/stdatomic.h (atomic_char8_t,
ATOMIC_CHAR8_T_LOCK_FREE): New typedef and macro.
gcc/c/ChangeLog:
* c-parser.cc (c_parser_string_literal): Use char8_t as the type
of CPP_UTF8STRING when char8_t support is enabled.
* c-typeck.cc (digest_init): Allow initialization of an array
of character type by a string literal with type array of
char8_t.
gcc/c-family/ChangeLog:
* c-lex.cc (lex_string, lex_charconst): Use char8_t as the type
of CPP_UTF8CHAR and CPP_UTF8STRING when char8_t support is
enabled.
* c-opts.cc (c_common_post_options): Set flag_char8_t if
targeting C2x.
gcc/testsuite/ChangeLog:
* gcc.dg/atomic/c2x-stdatomic-lockfree-char8_t.c: New test.
* gcc.dg/atomic/gnu2x-stdatomic-lockfree-char8_t.c: New test.
* gcc.dg/c11-utf8str-type.c: New test.
* gcc.dg/c17-utf8str-type.c: New test.
* gcc.dg/c2x-utf8str-type.c: New test.
* gcc.dg/c2x-utf8str.c: New test.
* gcc.dg/gnu2x-utf8str-type.c: New test.
* gcc.dg/gnu2x-utf8str.c: New test.
The type that triggers the ICE never got completed by the semantic
analysis pass. Checking for size forces it to be done, or issue a
compile-time error.
PR d/106555
gcc/d/ChangeLog:
* d-target.cc (Target::isReturnOnStack): Check for return type size.
gcc/testsuite/ChangeLog:
* gdc.dg/imports/pr106555.d: New test.
* gdc.dg/pr106555.d: New test.
An attach iterator has its _M_version set to something != 0, the container version. This
value shall be preserved when detaching it so that the iterator does not look like a
value-initialized one.
libstdc++-v3/ChangeLog:
* include/debug/formatter.h (__singular_value_init): New _Iterator_state enum entry.
(_Parameter<>(const _Safe_iterator<>&, const char*, _Is_iterator)): Check if iterator
parameter is value-initialized.
(_Parameter<>(const _Safe_local_iterator<>&, const char*, _Is_iterator)): Likewise.
* include/debug/safe_iterator.h (_Safe_iterator<>::_M_value_initialized()): New. Adapt
checks.
* include/debug/safe_local_iterator.h (_Safe_local_iterator<>::_M_value_initialized()): New.
Adapt checks.
* src/c++11/debug.cc (_Safe_iterator_base::_M_reset): Do not reset _M_version.
(print_field(PrintContext&, const _Parameter&, const char*)): Adapt state_names.
* testsuite/23_containers/deque/debug/iterator1_neg.cc: New test.
* testsuite/23_containers/deque/debug/iterator2_neg.cc: New test.
* testsuite/23_containers/forward_list/debug/iterator1_neg.cc: New test.
* testsuite/23_containers/forward_list/debug/iterator2_neg.cc: New test.
* testsuite/23_containers/forward_list/debug/iterator3_neg.cc: New test.
For compound literals empty struct stores are not removed as they go down a
different path of the gimplifier; trying to optimize the init constructor.
This fixes the problem by not adding the gimple assignment at the end
of gimplify_init_constructor if it was an empty type.
Note this updates gcc.dg/pr87052.c where we had:
const char d[0] = { };
And was expecting a store to d but after this, there is no store
as the decl's type is zero in size.
OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
gcc/ChangeLog:
PR middle-end/103645
* gimplify.cc (gimplify_init_constructor): Don't build/add
gimple assignment of an empty type.
gcc/testsuite/ChangeLog:
* gcc.dg/pr87052.c: Update d var to expect nothing.
Similar to AArch64 the Arm implementation of 128-bit atomics is broken.
For 128-bit atomics we rely on pthread barriers to correct guard the address
in the pointer to get correct memory ordering. However for 128-bit atomics the
address under the lock is different from the original pointer.
This means that one of the values under the atomic operation is not protected
properly and so we fail during when the user has requested sequential
consistency as there's no barrier to enforce this requirement.
As such users have resorted to adding an
#ifdef GCC
<emit barrier>
#endif
around the use of these atomics.
This corrects the issue by issuing a barrier only when __ATOMIC_SEQ_CST was
requested. I have hand verified that the barriers are inserted
for atomic seq cst.
libatomic/ChangeLog:
PR target/102218
* config/arm/host-config.h (pre_seq_barrier, post_seq_barrier,
pre_post_seq_barrier): Require barrier on __ATOMIC_SEQ_CST.
The AArch64 implementation of 128-bit atomics is broken.
For 128-bit atomics we rely on pthread barriers to correct guard the address
in the pointer to get correct memory ordering. However for 128-bit atomics the
address under the lock is different from the original pointer.
This means that one of the values under the atomic operation is not protected
properly and so we fail during when the user has requested sequential
consistency as there's no barrier to enforce this requirement.
As such users have resorted to adding an
#ifdef GCC
<emit barrier>
#endif
around the use of these atomics.
This corrects the issue by issuing a barrier only when __ATOMIC_SEQ_CST was
requested. To remedy this performance hit I think we should revisit using a
similar approach to out-line-atomics for the 128-bit atomics.
Note that I believe I need the empty file due to the include_next chain but
I am not entirely sure. I have hand verified that the barriers are inserted
for atomic seq cst.
libatomic/ChangeLog:
PR target/102218
* config/aarch64/aarch64-config.h: New file.
* config/aarch64/host-config.h: New file.
I've revisited the earlier two workarounds for dwarf2out_register_external_die
getting duplicate entries. It turns out that r11-525-g03d90a20a1afcb
added dref_queue pruning to lto_input_tree but decl reading uses that
to stream in DECL_INITIAL even when in the middle of SCC streaming.
When that SCC then gets thrown away we can end up with debug nodes
registered which isn't supposed to happen. The following adjusts
the DECL_INITIAL streaming to go the in-SCC way, using lto_input_tree_1,
since no SCCs are expected at this point, just refs.
PR lto/106540
PR lto/106334
* dwarf2out.cc (dwarf2out_register_external_die): Restore
original assert.
* lto-streamer-in.cc (lto_read_tree_1): Use lto_input_tree_1
to input DECL_INITIAL, avoiding to commit drefs.
Since this testcase is not exactly SSA specific and it would
be a good idea to compile this at more than just at -O1, moving
it to gcc.c-torture/compile would do that.
Committed as obvious after a test on x86_64-linux-gnu.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/pr93776.c: Moved to...
* gcc.c-torture/compile/pr93776.c: ...here.
Adding -march=cascadelake to the command line options of the new cmpti2.c
testcase triggers TImode STV and produces vector code that doesn't match
the scalar implementation that this test was intended to check. Adding
-mno-stv to the options fixes this. Committed as obvious.
2022-08-07 Roger Sayle <roger@nextmovesoftware.com>
gcc/testsuite/ChangeLog
* gcc.target/i386/cmpti2.c: Add -mno-stv to dg-options.
We claim we support P0415R1 (constexpr complex), but e.g.
#include <complex>
constexpr bool
foo ()
{
std::complex<double> a (1.0, 2.0);
a += 3.0;
a.real (6.0);
return a.real () == 6.0 && a.imag () == 2.0;
}
static_assert (foo ());
fails with
test.C:12:20: error: non-constant condition for static assertion
12 | static_assert (foo ());
| ~~~~^~
test.C:12:20: in ‘constexpr’ expansion of ‘foo()’
test.C:8:10: in ‘constexpr’ expansion of ‘a.std::complex<double>::real(6.0e+0)’
test.C:12:20: error: modification of ‘__real__ a.std::complex<double>::_M_value’ is not a constant expression
The problem is we don't handle REALPART_EXPR and IMAGPART_EXPR
in cxx_eval_store_expression.
The following patch attempts to support it (with a requirement
that those are the outermost expressions, ARRAY_REF/COMPONENT_REF
etc. are just not possible on the result of these, BIT_FIELD_REF
would be theoretically possible if trying to extract some bits
from one part of a complex int, but I don't see how it could appear
in the FE trees.
For these references, the code handles value being COMPLEX_CST,
COMPLEX_EXPR or CONSTRUCTOR_NO_CLEARING empty CONSTRUCTOR (what we use
to represent uninitialized values for C++20 and later) and the
code starts by rewriting it to COMPLEX_EXPR, so that we can freely
adjust the individual parts and later on possibly optimize it back
to COMPLEX_CST if both halves are constant.
2022-08-07 Jakub Jelinek <jakub@redhat.com>
PR c++/88174
* constexpr.cc (cxx_eval_store_expression): Handle REALPART_EXPR
and IMAGPART_EXPR. Change ctors from releasing_vec to
auto_vec<tree *>, adjust all uses. For !preeval, update ctors
vector.
* g++.dg/cpp1y/constexpr-complex1.C: New test.
This patch tweaks i386.md's *cmp<dwi>_doubleword splitter's predicate to
allow general_operand, not just x86_64_hilo_general_operand, to improve
code generation. As a general rule, i386.md's _doubleword splitters should
be post-reload splitters that require integer immediate operands to be
x86_64_hilo_int_operand, so that each part is a valid word mode immediate
constant. As an exception to this rule, doubleword patterns that must be
split before reload, because they require additional scratch registers,
can use take advantage of this ability to create new pseudos, to accept
any immediate constant, and call force_reg on the high and/or low parts
if they are not suitable immediate operands in word mode.
The benefit is shown in the new cmpti3.c test case below.
__int128 x;
int foo()
{
__int128 t = 0x1234567890abcdefLL;
return x == t;
}
where GCC with -O2 currently generates:
movabsq $1311768467294899695, %rax
xorl %edx, %edx
xorq x(%rip), %rax
xorq x+8(%rip), %rdx
orq %rdx, %rax
sete %al
movzbl %al, %eax
ret
but with this patch now generates:
movabsq $1311768467294899695, %rax
xorq x(%rip), %rax
orq x+8(%rip), %rax
sete %al
movzbl %al, %eax
ret
2022-08-07 Roger Sayle <roger@nextmovesoftware.com>
gcc/ChangeLog
* config/i386/i386.md (*cmp<dwi>_doubleword): Change predicate
for x86_64_hilo_general_operand to general operand. Call
force_reg on parts that are not x86_64_immediate_operand.
gcc/testsuite/ChangeLog
* gcc.target/i386/cmpti1.c: New test case.
* gcc.target/i386/cmpti2.c: Likewise.
* gcc.target/i386/cmpti3.c: Likewise.
This patch adds a new warning to -fanalyzer for jumps through NULL
function pointers.
gcc/analyzer/ChangeLog:
PR analyzer/105947
* analyzer.opt (Wanalyzer-jump-through-null): New option.
* engine.cc (class jump_through_null): New.
(exploded_graph::process_node): Complain about jumps through NULL
function pointers.
gcc/ChangeLog:
PR analyzer/105947
* doc/invoke.texi: Add -Wanalyzer-jump-through-null.
gcc/testsuite/ChangeLog:
PR analyzer/105947
* gcc.dg/analyzer/function-ptr-5.c: New test.
Signed-off-by: David Malcolm <dmalcolm@redhat.com>
This patch to the middle-end's RTL expansion reorders the code in
emit_store_flag_1 so that the backend has more control over how best
to expand/split double word equality/inequality comparisons against
zero or minus one. With the current implementation, the middle-end
always decides to lower this idiom during RTL expansion using SUBREGs
and word mode instructions, without ever consulting the backend's
machine description. Hence on x86_64, a TImode comparison against zero
is always expanded as:
(parallel [
(set (reg:DI 91)
(ior:DI (subreg:DI (reg:TI 88) 0)
(subreg:DI (reg:TI 88) 8)))
(clobber (reg:CC 17 flags))])
(set (reg:CCZ 17 flags)
(compare:CCZ (reg:DI 91)
(const_int 0 [0])))
This patch, which makes no changes to the code itself, simply reorders
the clauses in emit_store_flag_1 so that the middle-end first attempts
expansion using the target's doubleword mode cstore optab/expander,
and only if this fails, falls back to lowering to word mode operations.
On x86_64, this allows the expander to produce:
(set (reg:CCZ 17 flags)
(compare:CCZ (reg:TI 88)
(const_int 0 [0])))
which is a candidate for scalar-to-vector transformations (and
combine simplifications etc.). On targets that don't define a cstore
pattern for doubleword integer modes, there should be no change in
behaviour. For those that do, the current behaviour can be restored
(if desired) by restricting the expander/insn to not apply when the
comparison is EQ or NE, and operand[2] is either const0_rtx or
constm1_rtx.
This change just keeps RTL expansion more consistent (in philosophy).
For other doubleword comparisons, such as with operators LT and GT,
or with constants other than zero or -1, the wishes of the backend
are respected, and only if the optab expansion fails are the default
fall-back implementations using narrower integer mode operations
(and conditional jumps) used.
2022-08-05 Roger Sayle <roger@nextmovesoftware.com>
gcc/ChangeLog
* expmed.cc (emit_store_flag_1): Move code to expand double word
equality and inequality against zero or -1, using word operations,
to after trying to use the backend's cstore<mode>4 optab/expander.
This excludes value_replacement and store_elim from diamonds as they don't
handle the form properly.
gcc/ChangeLog:
PR middle-end/106534
* tree-ssa-phiopt.cc (tree_ssa_phiopt_worker): Guard the
value_replacement and store_elim from diamonds.
David Edelsohn
Immad Mir
Marek Polacek
Richard Biener
Jakub Jelinek
Kewen Lin
GCC Administrator
Martin Liska
Roger Sayle
David Malcolm
Vibhav Pant
Iain Buclaw
Andrew Stubbs
Tobias Burnus
Andrew MacLeod
Tom Honermann
François Dumont
Andrew Pinski
Tamar Christina
Jonathan Wakely