Paul Thomas [Thu, 26 Mar 2026 18:50:13 +0000 (18:50 +0000)]
Fortran: Minor PDT cleanup and fix in gfc_simplify_exp [PR115315]
2026-03-26 Paul Thomas <pault@gcc.gnu.org>
gcc/fortran
PR fortran/115315
* decl.cc (insert_parameter_exprs): Make strcmp condition more
concise.
(gfc_get_pdt_instance): Use gf_replace_expr where possible and
use return value of gfc_simplify_expr. Correct error in which
params->expr was being simplified instead of c2->initializer.
* expr.cc (gfc_simplify_expr): If the substring 'start' value
is less than zero, it is clearly out of range and so return
false.
gcc/testsuite/
PR fortran/115315
* gfortran.dg/pdt_90.f03: New test.
Jakub Jelinek [Thu, 26 Mar 2026 17:11:06 +0000 (18:11 +0100)]
testsuite: Fix up another tcl 9 compatibility problem
TCL 9 removed case command which has been deprecated before.
https://core.tcl-lang.org/tcl/wiki?name=Migrating+scripts+to+Tcl+9
says "Replace case with switch" and switch has been working in TCL 8
just fine.
2026-03-26 Jakub Jelinek <jakub@redhat.com>
* lib/mike-gcc.exp (postbase): Use switch instead of case for
TCL 9 compatibility.
* lib/mike-g++.exp (postbase): Likewise.
Michal Jires [Thu, 5 Mar 2026 09:03:21 +0000 (10:03 +0100)]
lto/124289 - Correctly handle toplevel asm with -flto-partition=cache
This patch adds create_asm_partitions to cache partitioning
to prevent issues with non-renameable symbols (while partition
joining) and static asm symbols (while partition splitting).
All other relevant partitionings use create_asm_partitions.
This was not used in cache partitioning, because toplevel asm
could be in principle special handled in cache partitioning
with marginally better results, but I never implemented it.
lto/124289
gcc/lto/ChangeLog:
* lto-partition.cc (enum map1to1_content): New.
(map_1_to_1): Use map1to1_content.
(lto_1_to_1_map): Likewise.
(create_asm_partitions): Likewise.
(lto_max_map): Likewise.
(lto_cache_map): Use create_asm_partitions.
gcc/testsuite/ChangeLog:
* gcc.dg/lto/toplevel-extended-asm-2_0.c: Add padding to asm label.
* gcc.dg/lto/toplevel-extended-asm-2_1.c: Add padding to asm label.
Marek Polacek [Thu, 19 Mar 2026 17:10:38 +0000 (13:10 -0400)]
c++/reflection: ICE with substitute and undeduced auto [PR123613]
In substitute7.C we have
template <typename T, auto ... Vs>
constexpr auto construct_from = T{Vs...}; // #1
struct Inner {};
struct Outer { Inner m; };
constexpr auto r = substitute(^^construct_from,
{ ^^Outer, ^^construct_from<Inner> });
which crashes because the auto in #1 hadn't been deduced when we
called eval_can_substitute -> lookup_template_variable when processing
the substitute call. We can call mark_used to resolve this, because
it has:
if (undeduced_auto_decl (decl))
maybe_instantiate_decl (decl);
and to make the json-parser.C test work, we have to do something
similar in eval_substitute, otherwise we crash due to another
undeduced auto.
PR c++/123613
gcc/cp/ChangeLog:
* reflect.cc (get_reflection): Call mark_used.
(eval_can_substitute): Don't resolve_nondeduced_context here.
(eval_substitute): Call lookup_and_finish_template_variable instead
of lookup_template_variable and finish_template_variable.
gcc/testsuite/ChangeLog:
* g++.dg/reflect/json-parser.C: New test.
* g++.dg/reflect/substitute7.C: New test.
* g++.dg/reflect/test.json: New test.
Harald Anlauf [Tue, 24 Mar 2026 21:04:29 +0000 (22:04 +0100)]
Fortran: fix rank/shape check in interface checking [PR124567]
PR fortran/124567
gcc/fortran/ChangeLog:
* interface.cc (gfc_check_dummy_characteristics): Split shape check
into a separate check for rank and a check for shape, taking into
account a corner case where the ambiguity between deferred shape
and assumed shape has not been fully resolved at the time of
checking.
gcc/testsuite/ChangeLog:
* gfortran.dg/pr124567.f90: New test.
* gfortran.dg/proc_decl_30.f90: Likewise.
Richard Biener [Wed, 25 Mar 2026 13:40:59 +0000 (14:40 +0100)]
gcov-profile/121074 - hold onto gcov file for less time
The following fixes the issue of two open gcov files at the
same time, one from -ftest-coverage, opened/closed by
coverage_init/finish and one from -fauto-profile, attempted
to be opened by pass_ipa_auto_profile. The solution is
to open the coverage files only during pass_ipa_tree_profile.
PR gcov-profile/121074
* coverage.h (coverage_init_file): Declare.
(coverage_finish_file): Likewise.
* coverage.cc (coverage_init_file): New function, split
out actual file opening and writing from ...
(coverage_init): ... here.
(coverage_finish_file): Likewise for file closing, from ...
(coverage_finish): ... here.
* tree-profile.cc (tree_profiling): Call coverage_init_file
and coverage_finish_file here.
Richard Biener [Wed, 25 Mar 2026 08:40:56 +0000 (09:40 +0100)]
tree-optimization/124627 - inlining and elided debug stmts
When we fixup a noreturn call during inlining we can end up eliding
debug stmts, so we have to make sure to not re-instantiate SSA
operands on those later when processing all debug stmts.
PR tree-optimization/124627
* tree-inline.cc (copy_debug_stmts): Only copy debug
stmts that are still in the IL.
Alexandre Oliva [Wed, 25 Mar 2026 09:45:47 +0000 (06:45 -0300)]
vxworks: fix gthr visibility issues
xtreme-header-8.C fails on VxWorks because various TU-local gthr
functions defined as static inline are referenced from libstdc++
symbols with global visibility.
C++ modules require those functions to be non-static inline, and other
gthr implementations adopt always_inline in C++.
Follow this practice in gthr-vxworks.h as well.
for libgcc/ChangeLog
* config/gthr-vxworks.h (__GTHREAD_ALWAYS_INLINE,
__GTHREAD_INLINE): Copy from gthr-posix.h. Replace static
inline with __GTHREAD_INLINE.
Alexandre Oliva [Wed, 25 Mar 2026 09:45:35 +0000 (06:45 -0300)]
[testsuite] [vxworks] add -gno-strict-dwarf to pr111409.c
The expected macro debug information is not issued with
-gstrict-dwarf, and ports such as vxworks default to that. Allow
non-strict dwarf for the test.
Alexandre Oliva [Wed, 25 Mar 2026 09:45:25 +0000 (06:45 -0300)]
testsuite: vect: slp-mask-store-1 accesses past the end of flags
The loop invokes undefined behavior: the flags array runs 0..31, but
so does the iterator i, thus the accesses to pairs therein run 0..63.
If we're lucky we find all zeros and don't mess with anything else,
but if we find any nonzero out-of-range flags, we'll end up scribbling
out of range onto x, that runs 0..15.
Surely the iterator wasn't meant to go up to 32. If it goes up to 16,
as proposed herein, we only access flags in range, and since its
second half is all zeros, we only access x in range as well.
30_threads/condition_variable_any/stop_token/wait_on.cc's
test_wait_until occasionally fails on vxworks under very high load, in
a way that suggests wait_until times out before the main thread
requests it to stop. Extend the timeouts to make more room for the
stop request.
for libstdc++-v3/ChangeLog
* testsuite/30_threads/condition_variable_any/stop_token/wait_on.cc
(test_wait_until): Extend the timeout for a stop request.
Alexandre Oliva [Wed, 25 Mar 2026 09:45:09 +0000 (06:45 -0300)]
[testsuite] [ppc] expect vectorization in gen-vect-11c.c with lp64
The first loop in main gets stores "vectorized" on powerpc64 into
full-word stores, even without any vector instruction support, so the
test's expectation of no loop vectorization is not met.
for gcc/testsuite/ChangeLog
* gcc.dg/tree-ssa/gen-vect-11c.c: xfail the test for no
vectorization on powerpc*-*-* && lp64.
Alexandre Oliva [Wed, 25 Mar 2026 09:44:55 +0000 (06:44 -0300)]
c++: arm -Wdeprecated fails for ctors
ARM requires C++ constructors to return the 'this' pointer. Setting
that up disables warnings at the ctor location for Wuse_after_free.
Unfortunately, the nowarn_spec_t mapping maps both Wuse_after_free and
Wdeprecated_declaration to the same NW_OTHER catchall group, so we
don't get deprecation warnings for constructors, and libstdc++'s
20_util/pair/cons/99957.cc fails.
We may want to consider also explicitly mapping Wdeprecated and
Wdeprecated_declaration to another group, but this minimal change
appears to be enough.
for gcc/ChangeLog
* gcc-diagnostic-spec.cc (nowarn_spec_t::nowarn_spec_t): Map
OPT_Wuse_after_free like OPT_Wuse_after_free_.
Paul Thomas [Wed, 25 Mar 2026 09:28:15 +0000 (09:28 +0000)]
Fortran: Invalid error in bounds check of elemental dim [PR119273]
2026-03-25 Paul Thomas <pault@gcc.gnu.org>
gcc/fortran
PR fortran/119273
* trans-array.cc (expr_contains_impure_fcn): New function.
(gfc_expr_contains_impure_fcn): New function calling above fcn.
(array_bound_check_elemental): Add indexse pre-block to se pre.
Warn if the index expression contains a function not declared
to be pure.
gcc/testsuite/
PR fortran/119273
* gfortran.dg/pr119273.f90: New test.
Rainer Orth [Wed, 25 Mar 2026 08:44:54 +0000 (09:44 +0100)]
i386: Fix gcc.target/i386/pr61599-1.c on Solaris/x86
The gcc.target/i386/pr61599-1.c test has been FAILing on Solaris/x86
with the native assembler for a long time:
FAIL: gcc.target/i386/pr61599-1.c (test for excess errors)
UNRESOLVED: gcc.target/i386/pr61599-1.c compilation failed to produce executable
Excess errors:
ld: fatal: relocation error: R_AMD64_PC32: file gcc/amd64/crtbegin.o: symbol completed.0: value 0xc01004b9 does not fit
ld: fatal: relocation error: R_AMD64_PC32: file gcc/amd64/crtbegin.o: symbol completed.0: value 0xc01004a7 does not fit
Looking closer, pr61599-1.o is 3.1 GB large with the native assembler.
Comparing the section headers between as and gas, one sees the difference:
The use of SHT_PROGBITS by as is due to gcc not emitting @nobits for the
.lbss sections, so as uses the default section type:
.section .lbss.a,"aw"
For .bss, we get this instead:
.section .bss.a,"aw",@nobits
as usually doesn't care about section names, but relies on the compiler
to correctly emit section types and flags.
This happens because x86_64_elf_section_type_flags first calls
default_section_type_flags, which doesn't know about .lbss and sets
SECTION_NOTYPE. When default_elf_asm_named_section later emits the
.section directive, @nobits is omitted even though SECTION_BSS has been
added by then.
To work around this, this patch clears SECTION_NOTYPE when SECTION_BSS
is set.
Similarly, the current assembler output relies on the assembler to set
the SHF_X86_64_LARGE section flag based on the section name. While gcc
emits the necessary flag letter ('l' with gas, 'h' with Solaris as) for
plain .lbss sections, it fails to do so for .lbss.*.
This patch adresses this by moving the gas definition of
MACH_DEP_SECTION_ASM_FLAG to i386/x86_64.h so it's picked up by all
64-bit x86 targets. It also extends ix86_in_large_data_p to also
consider .lbss.* etc. sections as large data sections, not just .lbss,
matching x86_64_elf_section_type_flags.
pr61599-1.o is identical without and with the section letter and section
type specifiec.
Bootstrapped without regressions on i386-pc-solaris2.11,
amd64-pc-solaris2.11, x86_64-pc-linux-gnu, and i686-pc-linux-gnu.
gcc:
* config/i386/i386.cc (ix86_in_large_data_p): Check for .lbss etc.
(x86_64_elf_section_type_flags): Clear SECTION_NOTYPE for .lbss etc.
* config/i386/x86-64.h (MACH_DEP_SECTION_ASM_FLAG): Define.
* config/i386/sol2.h [HAVE_SOLARIS_AS]
(MACH_DEP_SECTION_ASM_FLAG): Redefine as 'h'.
gcc/testsuite:
* gcc.target/i386/pr61599-1.c (dg-options): Add -save-temps.
(scan-assembler-times): Check for @nobits.
[PR124572, LRA]: Deal with generation of reload insns during elimination
It was assumed that elimination in LRA does not generate new reload
insns. In the testcase the elimination of SFP subreg generates reload
insn of the subreg and this insn is added at end of RTL code. The insn
is also skipped for necessary processing. This results in ICE. The patch
checks creation of reloads insn during elimination, insert them in the right
place, and add them for later processing.
gcc/ChangeLog:
PR rtl-optimization/124572
* lra-eliminations.cc (lra_eliminate): Push new reload insns for
eliminations in insns.
In the 'RTL SSA Access Lists' subsection of
GCC's documentation, an example of code with
an 'if'...'else' structure is given. The
given list of the full list of accesses is
said to include "use of the ebb4's R phi
definition of R by B". That cannot be true
because B is in the first substatement of the
'if' statement, whereas ebb4 is the second
substatement. First and second substatements
are mutually exclusive: there is no path to
B that goes through the degenerate phi node
of ebb4.
Previously code for the error message about VMAT_ELEMENTWISE and
VMAT_STRIDED_SLP could never be reached because it was dominated by
the logic for the unsupported access type for masked load.
This change reverses the two checks so that the more specific case
comes first.
gcc/ChangeLog:
* tree-vect-stmts.cc (vectorizable_load): Swap order of failure
message checks.
Martin Uecker [Sat, 7 Mar 2026 15:28:00 +0000 (16:28 +0100)]
c: Mark derived types variably-modified after struct/union completion [PR123424]
When structure types are completed and are variably-modified, we
need to make sure that C_TYPE_VARIABLY_MODIFIED is updated also
for derived types. For derived types which are not updated and
remain TYPE_STRUCTURAL_EQUALITY_P, we do recursion when checking
the bit instead. This change then fixes also a weird corner
case when forming composite types of mutually recursively
defined types.
We do not update other structure or union type that end up
with variably modified pointers, as it is not clear this is
needed and also needs further analysis.
Eric Botcazou [Mon, 23 Mar 2026 21:01:52 +0000 (22:01 +0100)]
Ada: Fix crash on instantiation in separate package body
This is an old regression present on all active branches for a quite unusual
setup where a generic package is declared and instantiated in a subunit, and
which comes from a thinko in the Has_Body.Find_Body routine of Sem_Elab.
Eric Botcazou [Mon, 23 Mar 2026 20:48:52 +0000 (21:48 +0100)]
Ada: Fix instantiation failure with formal array type after formal package
This comes from a confusion in the mapping maintained between formal and
actual parameters of the instantiation caused by the equivalent mapping
maintained for the instantiation of the formal package. The change just
removes the offending lines, which do not seem to serve any useful purpose.
gcc/ada/
PR ada/124606
* sem_ch12.adb (Find_Actual_Type): Rename formal parameter.
(Map_Formal_Package_Entities): Do not register base types.
gcc/testsuite/
* gnat.dg/generic_inst19.adb: New test.
Richard Biener [Mon, 23 Mar 2026 09:51:00 +0000 (10:51 +0100)]
tree-optimization/124599 - compile-time regression with PRE
The following fixes the reported compile-time regression after the
PRE change to properly track reference expressions in r16-8128-g5f1024922d3f67.
The issue is that the VN reference lookup code performs alias walks and
those are made quadratic for the transition from one VUSE to another
when that involves multiple translation steps. The error was to make
the VUSE part of the expression, but it is really part of the value.
So the following patch reverts this change, fixing the issue.
PR tree-optimization/124599
* tree-ssa-pre.cc (compute_avail): Make the VUSE in the
PRE reference expression part of the value again.
(phi_translate_1): Likewise.
Jakub Jelinek [Mon, 23 Mar 2026 11:10:02 +0000 (12:10 +0100)]
configure: Further {gas,gnu_ld}{,_flag} fixes [PR124547]
Andreas mentioned in the PR that {gas,gnu_ld}_flag vars should be only
ever used in configure.ac before . config.gcc and I agree with that.
config.gcc initializes the {gas,gnu_ld} vars to {gas,gnu_ld}_flag, then
for some triplets has gas=yes and/or gnu_ld=yes and in some rare cases
(for targets which basically require people to use --with{,out}-gnu-{as,ld})
x$gas = xyes/x$gnu_ld = xyes/x$gas != xyes/x$gnu_ld != xyes tests.
So, the following patch uses just what comes up from config.gcc from that
point onward (so, the user requested setting (which can be now empty if
unknown) possibly overridden by triplet). With the exception of solaris
(which does what it did before PR124547, i.e. always probe linker and
assembler) and the fallback case of checking gas/ld version if still unset
(but that in this patch only affects targets which don't override it
by triplet, i.e. targets which typically have a choice between GNU binutils
and some proprietary ones).
2026-03-23 Jakub Jelinek <jakub@redhat.com>
PR bootstrap/124547
* configure.ac: After config.gcc inclusion use or set only gas instead
of gas_flag and gnu_ld instead of gnu_ld_flag.
* config.gcc: Document possibility of gas_flag or gnu_ld_flag being
empty.
* acinclude.m4 (gcc_GAS_FLAGS): Use gas instead of gas_flag.
(gcc_AC_INITFINI_ARRAY): Likewise. Use gnu_ld instead of gnu_ld_flag.
* configure: Regenerate.
libgfortran: Disable caf_shmem without usable process-shared pthreads [PR124512]
Use a compile-time usability probe for the process-shared pthread API
required by caf_shmem and only build libcaf_shmem when that probe succeeds.
caf_shmem needs process-shared pthread primitives that are visible through
the default pthread headers. AX_PTHREAD already established the baseline
pthread flags; this additional check only verifies that the specific
process-shared API surface is usable for caf/shmem/thread_support.c.
PR fortran/124512
libgfortran/ChangeLog:
* Makefile.am: Adjust the dependencies.
* Makefile.in: Regenerate.
* configure: Regenerate.
* configure.ac: Add new check.
Signed-off-by: Christopher Albert <albert@tugraz.at>
Andrew Pinski [Sat, 21 Mar 2026 19:37:24 +0000 (12:37 -0700)]
x86: Mark the x86 va_builtins as nothrow and leaf [PR124597]
So all of the va_builtins are marked as nothrow and leaf but
the x86 backend builds the va builtins without this.
This causes both missed optimizations and in some cases
more work needs to be done by the middle-end handling of
these builtins.
This marks all of the x86 va builtins function decls as both
nothrow and leaf.
Bootstrapped and tested on x86_64-linux-gnu.
PR target/124597
gcc/ChangeLog:
* config/i386/i386-builtins.cc (ix86_init_builtins_va_builtins_abi):
Also add nothrow and leaf attributes to the va builtins.
Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
Andrew Pinski [Sat, 21 Mar 2026 20:16:17 +0000 (13:16 -0700)]
gimple-fold: Fix folding of va_end with maybe throw builtin [PR124597]
The problem here is when we are replacing the va_end with a GIMPLE_NOP,
gsi_replace is being called with true for updating the eh information.
This was a mistake; for most case this worked but with x86 backend
creating a function decl without nothrow on the VA_END, this caused
problems of not removing eh edge after removing the call. (The
x86 backend change is submitted in a different patch).
Bootstrapped and tested on x86_64-linux-gnu.
PR tree-optimization/124597
gcc/ChangeLog:
* gimple-fold.cc (gimple_fold_builtin_stdarg): Correct the
eh_update argument to gsi_replace for the VA_END case.
Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
Andrew Pinski [Sat, 21 Mar 2026 22:15:07 +0000 (15:15 -0700)]
sh: Fix modes on if_then_else [PR123852]
Inside the machine description of the sh target,
there are some modes missing on if_then_else rtl. This
causes an ICE during the vartrack pass where it is
creating a simplifying a subreg of that rtl.
This worked before r16-3067-g8e3239e3e92f3c where
simplify_gen_subreg would return NULL RTL on the
case where the mode was VOIDmode.
Anyways this is the obvious patch which adds the modes
on the if_then_else and now fixes the Ada and algol68
building (and some other code).
Tested by Doko on sh-linux-gnu and the Ada and algol68
langauges enabled.
Pushed as obvious.
PR target/123852
gcc/ChangeLog:
* config/sh/sh.md (movsicc_t_false): Add the SImode
on the if_then_else.
(movsicc_t_true): Likewise.
(negsi_cond): Likewise.
(negdi_cond): Add the DImode on the if_then_else.
(bst_m2a): Add the QImode on the if_then_else.
Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
Jose E. Marchesi [Sat, 21 Mar 2026 12:20:36 +0000 (13:20 +0100)]
a68: avoid libga68 dependency on libm
Using some of the operators and routines in the standard prelude lead
to a dependency on standard system math routines, usually available in
libm. This is the case for sin, cos, etc.
If no such operator/routine is used by the user program, however, the
dependency should not be there. We recently implemented some parts of
libga68 in Algol 68, and these use the entier operator. Using this
operator drags in a dependency on floor, floorf and floorl via some
GCC built-ins.
This patch adds the gnulib implementation of floor, floorl and floorf
to libga68.
Tested in x86_64-pc-linux-gnu, in both -m64 and -m32 modes.
Tested in i686-pc-linux-gnu.
Signed-off-by: Jose E. Marchesi <jemarch@gnu.org>
libga68/ChangeLog
* ga68-math.c: New file.
* floor.c: Imported from gnulib.
* configure.ac: Do not check for libm.
* Makefile.am (libga68_la_SOURCES): Add ga68-match.c.
* Makefile.in (am_libga68_la_OBJECTS): Regenerate.
* configure (ac_res): Likewise.
Matthias Kretz [Wed, 11 Feb 2026 14:19:17 +0000 (15:19 +0100)]
libstdc++: Implement [simd] for C++26
This implementation differs significantly from the
std::experimental::simd implementation. One goal was a reduction in
template instantiations wrt. what std::experimental::simd did.
Design notes:
- bits/vec_ops.h contains concepts, traits, and functions for working
with GNU vector builtins that are mostly independent from std::simd.
These could move from std::simd:: to std::__vec (or similar). However,
we would then need to revisit naming. For now we kept everything in
the std::simd namespace with __vec_ prefix in the names. The __vec_*
functions can be called unqualified because they can never be called
on user-defined types (no ADL). If we ever get simd<UDT> support this
will be implemented via bit_cast to/from integral vector
builtins/intrinsics.
- bits/simd_x86.h extends vec_ops.h with calls to __builtin_ia32_* that
can only be used after uttering the right GCC target pragma.
- basic_vec and basic_mask are built on top of register-size GNU vector
builtins (for now / x86). Any larger vec/mask is a tree of power-of-2
#elements on the "first" branch. Anything non-power-of-2 that is
smaller than register size uses padding elements that participate in
element-wise operations. The library ensures that padding elements
lead to no side effects. The implementation makes no assumption on the
values of these padding elements since the user can bit_cast to
basic_vec/basic_mask.
Implementation status:
- The implementation is prepared for more than x86 but is x86-only for
now.
- Parts of [simd] *not* implemented in this patch:
- std::complex<floating-point> as vectorizable types
- [simd.permute.dynamic]
- [simd.permute.mask]
- [simd.permute.memory]
- [simd.bit]
- [simd.math]
- mixed operations with vec-mask and bit-mask types
- some conversion optimizations (open questions wrt. missed
optimizations in the compiler)
- This patch implements P3844R3 "Restore simd::vec broadcast from int",
which is not part of the C++26 WD draft yet. If the paper does not get
accepted the feature will be reverted.
- This patch implements D4042R0 "incorrect cast between simd::vec and
simd::mask via conversion to and from impl-defined vector types" (to be
published once the reported LWG issue gets a number).
- The standard feature test macro __cpp_lib_simd is not defined yet.
Tests:
- Full coverage requires testing
1. constexpr,
2. constant-propagating inputs, and
3. unknown (to the optimizer) inputs
- for all vectorizable types
* for every supported width (1–64 and higher)
+ for all possible ISA extensions (combinations)
= with different fast-math flags
... leading to a test matrix that's far out of reach for regular
testsuite builds.
- The tests in testsuite/std/simd/ try to cover all of the API. The
tests can be build in every combination listed above. Per default only
a small subset is built and tested.
- Use GCC_TEST_RUN_EXPENSIVE=something to compile the more expensive
tests (constexpr and const-prop testing) and to enable more /
different widths for the test type.
- Tests can still emit bogus -Wpsabi warnings (see PR98734) which are
filtered out via dg-prune-output.
Benchmarks:
- The current implementation has been benchmarked in some aspects on
x86_64 hardware. There is more optimization potential. However, it is
not always clear whether optimizations should be part of the library
if they can be implemented in the compiler.
- No benchmark code is included in this patch.
libstdc++-v3/ChangeLog:
* include/Makefile.am: Add simd headers.
* include/Makefile.in: Regenerate.
* include/bits/version.def (simd): New.
* include/bits/version.h: Regenerate.
* include/bits/simd_alg.h: New file.
* include/bits/simd_details.h: New file.
* include/bits/simd_flags.h: New file.
* include/bits/simd_iterator.h: New file.
* include/bits/simd_loadstore.h: New file.
* include/bits/simd_mask.h: New file.
* include/bits/simd_mask_reductions.h: New file.
* include/bits/simd_reductions.h: New file.
* include/bits/simd_vec.h: New file.
* include/bits/simd_x86.h: New file.
* include/bits/vec_ops.h: New file.
* include/std/simd: New file.
* testsuite/std/simd/arithmetic.cc: New test.
* testsuite/std/simd/arithmetic_expensive.cc: New test.
* testsuite/std/simd/create_tests.h: New file.
* testsuite/std/simd/creation.cc: New test.
* testsuite/std/simd/creation_expensive.cc: New test.
* testsuite/std/simd/loads.cc: New test.
* testsuite/std/simd/loads_expensive.cc: New test.
* testsuite/std/simd/mask2.cc: New test.
* testsuite/std/simd/mask2_expensive.cc: New test.
* testsuite/std/simd/mask.cc: New test.
* testsuite/std/simd/mask_expensive.cc: New test.
* testsuite/std/simd/reductions.cc: New test.
* testsuite/std/simd/reductions_expensive.cc: New test.
* testsuite/std/simd/shift_left.cc: New test.
* testsuite/std/simd/shift_left_expensive.cc: New test.
* testsuite/std/simd/shift_right.cc: New test.
* testsuite/std/simd/shift_right_expensive.cc: New test.
* testsuite/std/simd/simd_alg.cc: New test.
* testsuite/std/simd/simd_alg_expensive.cc: New test.
* testsuite/std/simd/sse_intrin.cc: New test.
* testsuite/std/simd/stores.cc: New test.
* testsuite/std/simd/stores_expensive.cc: New test.
* testsuite/std/simd/test_setup.h: New file.
* testsuite/std/simd/traits_common.cc: New test.
* testsuite/std/simd/traits_impl.cc: New test.
* testsuite/std/simd/traits_math.cc: New test.
Nathaniel Shead [Thu, 19 Mar 2026 11:58:11 +0000 (22:58 +1100)]
c++/modules: Support section attributes [PR122786]
This is a minimal fix to not just silently drop the section attribute on
stream-in. Ideally we should be using cplus_decl_attributes for this,
but it's not yet ready for modules (many attributes behave weirdly when
applied not during parsing). We should also be checking for
incompatible sections on stream-in in is_matching_decl, but that would
also be better handled more generally so I'm leaving that out of this
patch.
Instead this minimally fixes the issue by just re-applying the section
name from the attributes we've streamed in.
PR c++/122786
gcc/cp/ChangeLog:
* module.cc (trees_in::decl_value): Set section name from
attribute.
gcc/testsuite/ChangeLog:
* g++.dg/modules/attrib-5_a.C: New test.
* g++.dg/modules/attrib-5_b.C: New test.
Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com> Reviewed-by: Jason Merrill <jason@redhat.com>
Nathaniel Shead [Thu, 19 Mar 2026 11:56:20 +0000 (22:56 +1100)]
c++/modules: Handle maybe_unused on PARM_DECLs [PR124483]
The [[maybe_unused]] attribute works by marking relevant entities as
TREE_USED, and DECL_READ_P for vars and parms. But modules streaming
typically clears this flag unless reading a definition. This patch sets
it back again when we see this attribute applied to a parameter.
PR c++/124483
gcc/cp/ChangeLog:
* module.cc (trees_in::fn_parms_init): Set TREE_USED and
DECL_READ_P for parameters deliberately marked unused.
gcc/testsuite/ChangeLog:
* g++.dg/modules/attrib-4_a.C: New test.
* g++.dg/modules/attrib-4_b.C: New test.
Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com> Reviewed-by: Jason Merrill <jason@redhat.com>
Tobias Burnus [Thu, 19 Mar 2026 22:55:56 +0000 (22:55 +0000)]
openmp: sorry instead of ICE for unimplemented mapper with iterator [PR122866]
Support for iterators on mapper functions is an OpenMP 5.2
feature that is not implemented yet. Presently attempting to use
this feature results in an ICE; let's make it a more user-friendly
"sorry" until we get around to implementing this.
gcc/ChangeLog
PR c/122866
* gimplify.cc (omp_instantiate_mapper): Give a sorry if there are
iterators.
Eric Botcazou [Fri, 20 Mar 2026 21:18:54 +0000 (22:18 +0100)]
Ada: Fix interaction between overloading and types with implicit dereference
The overall strategy for types declared with implicit dereference is to add
two interpretations for every name, the direct one and the one corresponding
to the generalized reference. But the two interpretations are not always
preserved through the analysis and, more importantly, the resolution stops
at the first couple of interpretations for such a name, disregarding more
traditional overloading of specific names.
The change makes sure that the two interpretation are preserved through the
analysis, and implements the proper resolution of traditionally overloaded
names in the presence of types with implicit dereference. It also performs
some streamlining in the common processing of overloaded nodes in Resolve.
gcc/ada/
PR ada/120669
* sem_ch4.adb (Analyze_Explicit_Dereference): Remove interpretations
of the prefix only if they are of access types.
(Analyze_One_Call.Indicate_Name_And_Type): Check for an implicit
dereference only after indicating the name and type of the call.
* sem_ch5.adb (Analyze_Assignment): Do not remove interpretations
for the LHS if they are for a type with implicit dereference.
* sem_res.adb (Resolve): Streamline the processing of overloaded
nodes once an interpretation is picked for them. Add a specific
handling for additional interpretations for generalized references.
(Resolve_Explicit_Dereference): Remove interpretations of the prefix
only if they are of access types.
(Is_Ambiguous_Operand): Skip the direct interpretation for a limited
type that has implicit dereference.
* sem_type.adb (Add_One_Interp): Set the name of the first entry of
the table of interpretations in more cases.
Marek Polacek [Thu, 19 Mar 2026 13:33:15 +0000 (09:33 -0400)]
c++/reflection: ICE with lifetime extension of consteval-only [PR124575]
Here we ICE in output_constant because we attempt to emit the temporary
created for lifetime extension of a consteval-only expression. Like
other consteval-only variables, the temporary also has to be marked
DECL_EXTERNAL so that we don't emit it.
I tried to do the setting in make_temporary_var_for_ref_to_temp, but
then we ICE in set_decl_context_in_fn.
PR c++/124575
gcc/cp/ChangeLog:
* call.cc (set_up_extended_ref_temp): If var is consteval-only,
mark it DECL_EXTERNAL.
gccrs: Move cli inner attribute injection to injection
Inner attribute injection was not within the injection function where
the other things get injected within a crate.
gcc/rust/ChangeLog:
* rust-session-manager.cc (Session::compile_crate): Use additional
cli attributes for the injection function. Move additional attribute
injection from here...
(Session::injection): ... to here.
* rust-session-manager.h: Update injection fonction prototype.
no_std is a builtin attribute required for rust-for-linux but was
missing from the builtin attribute list and instead considered an unknown
attribute macro invocation.
gcc/rust/ChangeLog:
* util/rust-attributes.cc: Add no_std to list of builtin attributes.
The compiler was accepting `#![no_core]` without requiring
`#![feature(no_core)]`, silently treating an unstable attribute
as stable. Gate it via check_no_core_attribute, consistent with
how other experimental attributes are handled.
Harishankar [Fri, 27 Feb 2026 01:43:10 +0000 (07:13 +0530)]
gccrs: resolve: Fix ICE on ambiguous glob re-exports
This patch adds an ambiguity check in 'finalize_rebind_import'.
If a Definition is ambiguous, it emits a proper error diagnostic
instead of crashing, consistent with rustc's behavior(verified)
Fixes Rust-GCC/gccrs#4411
gcc/rust/ChangeLog:
* resolve/rust-early-name-resolver-2.0.cc (Early::finalize_rebind_import): Add ambiguity
check before calling get_node_id() on glob import definitions.
gccrs: Use custom error type for enum variants parsing
gcc/rust/ChangeLog:
* parse/rust-parse-error.h (struct EnumVariant): Add error for enum
variant.
* parse/rust-parse-impl.hxx: Use new error type instead of nullptr.
* parse/rust-parse.h: Update function prototype.
* checks/lints/rust-lint-unused-var.cc (starts_with_underscore): Add
function to detect underscore within symbol name.
(check_decl): Call new function for underscore checking.
jayant chauhan [Sat, 14 Feb 2026 15:44:21 +0000 (21:14 +0530)]
gccrs: expand: Fix ICE on unimplemented RustcEncodable/Decodable derives
When encountering `#[derive(RustcEncodable)]` or `RustcDecodable`, the
`DeriveVisitor` previously fell through to `rust_unreachable ()`,
causing an Internal Compiler Error.
This patch adds cases for these built-in macros to explicitly emit a
"sorry, unimplemented" message instead of crashing.
Fixes Rust-GCC#3951
gcc/rust/ChangeLog:
* expand/rust-derive.cc (DeriveVisitor::derive): Handle
`BuiltinMacro::RustcEncodable` and `BuiltinMacro::RustcDecodable`.
vibhatsu [Fri, 6 Feb 2026 07:47:32 +0000 (13:17 +0530)]
gccrs: refactor: use MacroInvocation's node id everywhere for consistency
gcc/rust/ChangeLog:
* ast/rust-macro.h: remove get_macro_node_id and propagate
MacroInvocation's node id through get_node_id for consistency
* util/rust-hir-map.cc (Mappings::insert_macro_invocation): replace
all get_macro_node_id calls with get_node_id calls
(Mappings::lookup_macro_invocation): likewise
(Mappings::insert_bang_proc_macro_invocation): likewise
(Mappings::lookup_bang_proc_macro_invocation): likewise
Jayant Chauhan [Fri, 16 Jan 2026 17:34:00 +0000 (23:04 +0530)]
gccrs: ast: Implement reconstruct() logic for Path hierarchy
This patch implements the `reconstruct` pattern for the `Path` hierarchy and its
constituents (segments, generic args, qualified paths).
Previously, derive expansion macros (like `derive(PartialEq)`) had to manually
rebuild paths field-by-field to ensure fresh NodeIDs. This change moves that
logic into the AST classes themselves, allowing paths to be deeply reconstructed
uniformly. This ensures that expanded code has unique NodeIDs, which is critical
for correct name resolution.
gcc/rust/ChangeLog:
* ast/rust-path.h (GenericArgsBinding::reconstruct): New method.
(GenericArg::reconstruct): New method.
(GenericArgs::reconstruct): New method.
(PathExprSegment::reconstruct): New method.
(PathInExpression::reconstruct): New method.
(TypePathSegmentGeneric::reconstruct_impl): New method.
(TypePathFunction::reconstruct): New method.
(TypePathSegmentFunction::reconstruct_impl): New method.
(QualifiedPathType::reconstruct): New method.
(QualifiedPathInExpression::reconstruct): New method.
(QualifiedPathInType::reconstruct_impl): New method.
* expand/rust-derive-cmp-common.cc (EnumMatchBuilder::tuple): Use path.reconstruct().
(EnumMatchBuilder::strukt): Use path.reconstruct().
Add a no_std attribute, when both no_std and no_core attributes are
missing, inject an external std crate.
gcc/rust/ChangeLog:
* rust-session-manager.cc (Session::compile_crate): Inject std crate
when both no_std and no_core attributes are missing.
* util/rust-attribute-values.h: Add no_std attribute value.
gccrs: Remove duplicated visit within early name res
Attribute content was checked twice within the early name resolution,
from outside the attribute and then using the default visitor. Remove
the first one visit. Also fix the wrong locus on trait resolution.
gcc/rust/ChangeLog:
* resolve/rust-early-name-resolver-2.0.cc (Early::visit_derive_attribute):
Change from attribute locus to trait locus.
(Early::visit_attributes): Remove function.
(Early::visit): Remove functions.
* resolve/rust-early-name-resolver-2.0.h: Remove unused prototypes.
gccrs: Correctly emit warning on invalid attributes
We were emitting warning even on attribute that were then removed by
the cfgstrip pass. We cannot move the cfg strip pass before the attribute
checking because we need to first emit malformed input error messages.
This means the attribute checking pass must know if an attribute input
may be removed later down the line.
gcc/rust/ChangeLog:
* ast/rust-ast.cc (MetaItemPathExpr::to_attribute): Remove cast to
literal.
(AttrInputMetaItemContainer::separate_cfg_attrs): Remove PathExpr
specific code.
* expand/rust-cfg-strip.cc (expand_cfg_attrs): Remove the whole
attribute if condition's result is false.
* util/rust-attributes.cc (AttributeChecker::visit): Remove specific
code section for meta item container. Do not check input if
configuration does not match condition.
gcc/testsuite/ChangeLog:
* rust/compile/attr_malformed_path.rs: Filter existing test to x86_64
exclusively, add two new tests that appear when visiting the resulting
expression.
We will require expr within attribute input in the future in order to be
able to handle some nightly features. Even, the current macro attribute
input could be converted to an expression attribute input.
gcc/rust/ChangeLog:
* ast/rust-ast-collector.cc (TokenCollector::visit): Add visitor
implementation.
* ast/rust-ast-visitor.cc (DefaultASTVisitor::visit): Likewise.
* ast/rust-ast-collector.h: Add function prototype.
* ast/rust-ast-visitor.h: Likewise.
* expand/rust-derive.h: Likewise.
* hir/rust-ast-lower-base.h: Likewise.
* ast/rust-ast.cc (Attribute::get_traits_to_derive): Handle EXPR
variant.
(AttrInputExpr::AttrInputExpr): Add constructor.
(AttrInputExpr::operator=): Add assignment operator implementation.
(AttrInputExpr::as_string): Add a string conversion member function.
(AttrInputExpr::accept_vis): Add visitor function.
* ast/rust-ast.h: Add EXPR type variant to AttrInput.
* util/rust-attributes.cc (check_doc_attribute): Handle expr variant.
* ast/rust-expr.h (class AttrInputExpr): Add class definition with
member function prototypes.
* hir/rust-ast-lower-base.cc (ASTLoweringBase::visit): Add empty
visitor implementation.
A crate is not a visitable and thus cannot be used with the debug
function. Until it is made visitable this commit provides a function
to dump the content of a crate.
gcc/rust/ChangeLog:
* ast/rust-ast-dump.cc (debug): Add debug function which calls debug
on every crate field.
* ast/rust-ast-dump.h (debug): Add function prototype.
gccrs: Use Attribute node status for AttributeChecker
Remove attribute specific checking, use default ast visitor instead.
gcc/rust/ChangeLog:
* util/rust-attributes.cc (AttributeChecker::visit): Rename function
and make call to ast default visitor.
(AttributeChecker::check_attribute): Remove function.
* util/rust-attributes.h: Add function prototype.
Attribute have always been a bit weird, they were part of the AST but did
not have any visitor function, this create a lot of friction around them
as their input which may be an expression, a literal and even an
expression in the future didn't get visited properly during the different
passes of the compiler.
gcc/rust/ChangeLog:
* ast/rust-ast-full-decls.h (struct Attribute): Change from here...
(class Attribute): ...to a class here.
* ast/rust-ast-visitor.cc (DefaultASTVisitor::visit): Add a default
visit function for the attributes.
* ast/rust-ast-visitor.h: Add a proper visit function declaration for
attributes.
* ast/rust-ast.cc (Attribute::accept_vis): Add a function to accept a
visitor within the attributes.
* ast/rust-ast.h (struct Attribute): Add the accept_vis function
prototype.
(class Attribute): Rename from struct to class.
* expand/rust-derive.h: Add an empty implementation for visits to
prevent the visitor from recursing into the attributes.
* hir/rust-ast-lower-base.cc (ASTLoweringBase::visit): Add missing
implementation for attribute visit function. Add a check for derive
attributes that would have slipped through the passes.
* hir/rust-ast-lower-base.h: Add function prototype.
* resolve/rust-early-name-resolver-2.0.cc (Early::visit_attributes):
Split the function into two halves.
(Early::visit_derive_attribute): Specialized function from
visit_attribute for derive attributes.
(Early::visit_non_builtin_attribute): Likewise for non builtin
attributes.
(Early::visit): Rename visit_attributes to visit.
* resolve/rust-early-name-resolver-2.0.h (class Early): Update function
prototypes.
gcc/testsuite/ChangeLog:
* rust/compile/issue-4212.rs: Update test with the new errors.
gccrs: Add crate_name and crate_type to attribute values
gcc/rust/ChangeLog:
* rust-session-manager.cc (Session::handle_crate_name): Use the new
constexpr instead of a raw string value.
* util/rust-attribute-values.h: Add crate_name and crate_type values.
gccrs: Move early gate feature store to it's own TU
Move the early feature gate store to it's own translation unit. This
will reduces the size of included headers within the parser.
gcc/rust/ChangeLog:
* Make-lang.in: Add new specific feature store file.
* checks/errors/feature/rust-feature-gate.cc (EarlyFeatureGateStore::get):
Move from here to rust-feature-store.cc.
(EarlyFeatureGateStore::add): Likewise.
(EarlyFeatureGateStore::get_error): Likewise.
(FeatureGate::check): Likewise.
* checks/errors/feature/rust-feature-gate.h (class EarlyFeatureGateStore):
Move class declaration to rust-feature-store.h header.
* parse/rust-parse.h: Change included header.
* checks/errors/feature/rust-feature-store.cc: New file.
* checks/errors/feature/rust-feature-store.h: New file.
gccrs: Collect early feature gating errors in a store
We use multiple parsers and can't retrieve all early feature gating
errors within the usual gating pass. This commit introduces a store to
collect all early gating errors in the same place from multiple parsers.
The features are then checked as usual within the feature gate checker.
gcc/rust/ChangeLog:
* checks/errors/feature/rust-feature-gate.cc (EarlyFeatureGateStore::get):
Add function to retrieve singleton instance.
(EarlyFeatureGateStore::add): New function to add an error and the
corresponding feature in the store.
(EarlyFeatureGateStore::get_error): Add new function to retrieve the
oldest error.
(FeatureGate::check): Update the function to retrieve the errors from
the store instead of getting it from the parameters.
* checks/errors/feature/rust-feature-gate.h (class EarlyFeatureGateStore):
Add a new class to collect all early feature gating errors.
* parse/rust-parse.h: Use store instead of keeping the errors within
the parser instance.
* rust-session-manager.cc (Session::compile_crate): Remove old early
error collection from the main parser.
* rust-system.h: Include queue header.
gcc/testsuite/ChangeLog:
* rust/compile/issue-3661.rs: Add key_value_attribute feature to
prevent error on stringify macro.
* rust/compile/early_feature_gate_in_macro.rs: Add test to highlight
early feature gate error collection within macros.
Some nightly features change the parser's behavior, it may accepts syntax
that should be rejected when the feature is missing. But the complete
list of enabled features can only be found once the parsing is complete.
We should therefore not emit any error at parse time and instead collect
a potential error and emit it later during the feature gating step.
gcc/rust/ChangeLog:
* checks/errors/feature/rust-feature-gate.cc (FeatureGate::check):
Check all parse time errors.
* checks/errors/feature/rust-feature-gate.h: Update function prototype
with parse time errors.
* parse/rust-parse-impl-attribute.hxx: Collect potential gating error
with non literal attribute values. Remove error emission.
* parse/rust-parse.h: Add a function to gather potential feature gating
errors as well as a getter for collected errors.
* rust-session-manager.cc (Session::compile_crate): Retrieve potential
feature gating errors and check them later during the feature gating
step.
* util/rust-attributes.cc (check_export_name_attribute): Change
attribute checking error emission to prevent errors with macro inputs.
gcc/testsuite/ChangeLog:
* rust/compile/doc_macro.rs: Enable feature to use a macro within an
attribute input.
* rust/compile/parse_time_feature_gate.rs: New test.
rust-for-linux uses some nightly features that appeared with rust 1.50,
this patch provides a new mechanism dedicated to features required for
rfl that were not available back then.
gcc/rust/ChangeLog:
* checks/errors/feature/contrib/fetch: Bump version from 1.49.0 to
1.50.0. Change brace expansion to explicit file fetch.
* checks/errors/feature/rust-feature-defs.h: Regenerate.
* checks/errors/feature/contrib/copyright-stub.h: Add rfl include
directive.
* checks/errors/feature/rust-feature-defs-rfl.h: New file.
projects / thirdparty / gcc.git / log
