call_summary: modify cgraph hooks.

gcc/ChangeLog:

* symbol-summary.h (function_summary_base::unregister_hooks):
Call disable_insertion_hook and disable_duplication_hook.
(function_summary_base::symtab_insertion): New field.
(function_summary_base::symtab_removal): Likewise.
(function_summary_base::symtab_duplication): Likewise.
Register hooks in function_summary_base and directly register
(or unregister) hooks.

Add test for pr97560.

gcc/testsuite/ChangeLog:

PR tree-optimization/97560
* g++.dg/pr97560.C: New test.

[RS6000] Separate dg-require-effective-target options

* gcc.target/powerpc/vsx_mask-count-runnable.c: Separate options
passed to dg-require-effective-target.
* gcc.target/powerpc/vsx_mask-expand-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-extract-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-move-runnable.c: Likewise.

Daily bump.

[RS6000] Remove -mpcrel from tests

When running with -m32
FAIL: gcc.target/powerpc/pr94740.c (test for excess errors)
Excess errors:
cc1: error: '-mpcrel' requires '-mcmodel=medium'

The others don't run for -m32, but remove the unnecessary -mpcrel
anyway.

* gcc.target/powerpc/localentry-1.c: Remove -mpcrel from options.
* gcc.target/powerpc/notoc-direct-1.c: Likewise.
* gcc.target/powerpc/pr94740.c: Likewise.

[RS6000] biarch test fail

* gcc.target/powerpc/bswap64-4.c: Comment.

[RS6000] Replace -mcpu with -mdejagnu-cpu

* gcc.target/powerpc/pr93122.c: Replace -mcpu with -mdejagnu-cpu.
* gcc.target/powerpc/vsx_mask-count-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-expand-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-extract-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-move-runnable.c: Likewise.

[RS6000] Tests that use int128_t and -m32

All these tests fail with -m32 due to lack of int128 support, in some
cases with what I thought was not the best error message.  For example
vsx_mask-move-runnable.c:34:3: error: unknown type name 'vector'
is misleading.  The problem isn't "vector" but "vector __uint128_t".

* gcc.target/powerpc/vsx-load-element-extend-char.c: Require int128.
* gcc.target/powerpc/vsx-load-element-extend-int.c: Likewise.
* gcc.target/powerpc/vsx-load-element-extend-longlong.c: Likewise.
* gcc.target/powerpc/vsx-load-element-extend-short.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-char.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-int.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-longlong.c: Likewise.
* gcc.target/powerpc/vsx-store-element-truncate-short.c: Likewise.
* gcc.target/powerpc/vsx_mask-count-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-expand-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-extract-runnable.c: Likewise.
* gcc.target/powerpc/vsx_mask-move-runnable.c: Likewise.

[RS6000] Link power10 testcases

Running the assembler and linker catches more errors.

* gcc.target/powerpc/cfuged-1.c,
gcc.target/powerpc/cntlzdm-1.c,
gcc.target/powerpc/cnttzdm-1.c,
gcc.target/powerpc/dg-future-1.c,
gcc.target/powerpc/lsbb-runnable.c,
gcc.target/powerpc/mma-double-test.c,
gcc.target/powerpc/mma-single-test.c,
gcc.target/powerpc/p10-arch31.c,
gcc.target/powerpc/p10-identify.c,
gcc.target/powerpc/pdep-1.c,
gcc.target/powerpc/pextd-1.c,
gcc.target/powerpc/pr96787-2.c,
gcc.target/powerpc/vec-blend-runnable.c,
gcc.target/powerpc/vec-cfuged-1.c,
gcc.target/powerpc/vec-clrl-1.c,
gcc.target/powerpc/vec-clrl-3.c,
gcc.target/powerpc/vec-clrr-1.c,
gcc.target/powerpc/vec-clrr-3.c,
gcc.target/powerpc/vec-cntlzm-1.c,
gcc.target/powerpc/vec-cnttzm-1.c,
gcc.target/powerpc/vec-extracth-1.c,
gcc.target/powerpc/vec-extracth-3.c,
gcc.target/powerpc/vec-extracth-5.c,
gcc.target/powerpc/vec-extracth-7.c,
gcc.target/powerpc/vec-extractl-1.c,
gcc.target/powerpc/vec-extractl-3.c,
gcc.target/powerpc/vec-extractl-5.c,
gcc.target/powerpc/vec-extractl-7.c,
gcc.target/powerpc/vec-gnb-1.c,
gcc.target/powerpc/vec-insert-word-runnable.c,
gcc.target/powerpc/vec-pdep-1.c,
gcc.target/powerpc/vec-permute-ext-runnable.c,
gcc.target/powerpc/vec-pext-1.c,
gcc.target/powerpc/vec-replace-word-runnable.c,
gcc.target/powerpc/vec-shift-double-runnable.c,
gcc.target/powerpc/vec-splati-runnable.c,
gcc.target/powerpc/vec-stril-1.c,
gcc.target/powerpc/vec-stril-16.c,
gcc.target/powerpc/vec-stril-17.c,
gcc.target/powerpc/vec-stril-18.c,
gcc.target/powerpc/vec-stril-19.c,
gcc.target/powerpc/vec-stril-20.c,
gcc.target/powerpc/vec-stril-21.c,
gcc.target/powerpc/vec-stril-22.c,
gcc.target/powerpc/vec-stril-23.c,
gcc.target/powerpc/vec-stril-3.c,
gcc.target/powerpc/vec-stril-5.c,
gcc.target/powerpc/vec-stril-7.c,
gcc.target/powerpc/vec-stril_p-1.c,
gcc.target/powerpc/vec-stril_p-3.c,
gcc.target/powerpc/vec-stril_p-5.c,
gcc.target/powerpc/vec-stril_p-7.c,
gcc.target/powerpc/vec-strir-1.c,
gcc.target/powerpc/vec-strir-16.c,
gcc.target/powerpc/vec-strir-17.c,
gcc.target/powerpc/vec-strir-18.c,
gcc.target/powerpc/vec-strir-19.c,
gcc.target/powerpc/vec-strir-20.c,
gcc.target/powerpc/vec-strir-21.c,
gcc.target/powerpc/vec-strir-22.c,
gcc.target/powerpc/vec-strir-23.c,
gcc.target/powerpc/vec-strir-3.c,
gcc.target/powerpc/vec-strir-5.c,
gcc.target/powerpc/vec-strir-7.c,
gcc.target/powerpc/vec-strir_p-1.c,
gcc.target/powerpc/vec-strir_p-3.c,
gcc.target/powerpc/vec-strir_p-5.c,
gcc.target/powerpc/vec-strir_p-7.c,
gcc.target/powerpc/vec-ternarylogic-1.c,
gcc.target/powerpc/vec-ternarylogic-3.c,
gcc.target/powerpc/vec-ternarylogic-5.c,
gcc.target/powerpc/vec-ternarylogic-7.c,
gcc.target/powerpc/vec-ternarylogic-9.c,
gcc.target/powerpc/vsx_mask-count-runnable.c,
gcc.target/powerpc/vsx_mask-expand-runnable.c,
gcc.target/powerpc/vsx_mask-extract-runnable.c,
gcc.target/powerpc/vsx_mask-move-runnable.c,
gcc.target/powerpc/xxgenpc-runnable.c: Link testcase when it
can't be run.

[RS6000] dimode_off.c test

This tests behaviour near the limit of 16-bit signed offsets.  If
power10 prefix instructions are enabled, no such testing occurs.

* gcc.target/powerpc/dimode_off.c: Add -mno-prefixed to options.

[RS6000] Non-pcrel tests when power10

These tests require -mno-pcrel because they are testing features
of the non-pcrel ABI.

* gcc.target/powerpc/cprophard.c: Add -mno-pcrel to options.
* gcc.target/powerpc/float128-hw3.c: Likewise.
* gcc.target/powerpc/pr79439-1.c: Likewise.
* gcc.target/powerpc/pr79439-2.c: Likewise.
* gcc.target/powerpc/r2_shrink-wrap.c: Likewise.

syscall: import additional BSD-specific syscall wrappers

Import additional code from upstream for handing system
calls on BSD systems. This makes the syscall package on
NetBSD complete enough to compile the standard library.

Updates golang/go#38538.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/265123

Combine logical OR ranges properly.

When combining logical OR operands with a FALSE result, union the false
ranges for operand1 and operand2... not intersection.

gcc/
PR tree-optimization/97567
* gimple-range-gori.cc (gori_compute::logical_combine): Union the
ranges of operand1 and operand2, not intersect.
gcc/testsuite/
* gcc.dg/pr97567.c: New.

libstdc++: Fix error in experimental::strand

libstdc++-v3/ChangeLog:

* include/experimental/executor (strand::_State): Fix thinko.

Extend builtin fnspecs

* attr-fnspec.h: Update toplevel comment.
(attr_fnspec::attr_fnspec): New constructor.
(attr_fnspec::arg_read_p,
attr_fnspec::arg_written_p,
attr_fnspec::arg_access_size_given_by_arg_p,
attr_fnspec::arg_single_access_p
attr_fnspec::loads_known_p
attr_fnspec::stores_known_p,
attr_fnspec::clobbers_errno_p): New member functions.
(gimple_call_fnspec): Declare.
(builtin_fnspec): Declare.
* builtins.c: Include attr-fnspec.h
(builtin_fnspec): New function.
* builtins.def (BUILT_IN_MEMCPY): Do not specify RET1 fnspec.
(BUILT_IN_MEMMOVE): Do not specify RET1 fnspec.
(BUILT_IN_MEMSET): Do not specify RET1 fnspec.
(BUILT_IN_STRCAT): Do not specify RET1 fnspec.
(BUILT_IN_STRCPY): Do not specify RET1 fnspec.
(BUILT_IN_STRNCAT): Do not specify RET1 fnspec.
(BUILT_IN_STRNCPY): Do not specify RET1 fnspec.
(BUILT_IN_MEMCPY_CHK): Do not specify RET1 fnspec.
(BUILT_IN_MEMMOVE_CHK): Do not specify RET1 fnspec.
(BUILT_IN_MEMSET_CHK): Do not specify RET1 fnspec.
(BUILT_IN_STRCAT_CHK): Do not specify RET1 fnspec.
(BUILT_IN_STRCPY_CHK): Do not specify RET1 fnspec.
(BUILT_IN_STRNCAT_CHK): Do not specify RET1 fnspec.
(BUILT_IN_STRNCPY_CHK): Do not specify RET1 fnspec.
* gimple.c (gimple_call_fnspec): Return attr_fnspec.
(gimple_call_arg_flags): Update.
(gimple_call_return_flags): Update.
* tree-ssa-alias.c (check_fnspec): New function.
(ref_maybe_used_by_call_p_1): Use fnspec for builtin handling.
(call_may_clobber_ref_p_1): Likewise.
(attr_fnspec::verify): Update verifier.
* calls.c (decl_fnspec): New function.
(decl_return_flags): Use it.

Handle signed 1-bit ranges in irange::invert.

The problem here is we are trying to add 1 to a -1 in a signed 1-bit
field and coming up with UNDEFINED because of the overflow.

Signed 1-bits are annoying because you can't really add or subtract
one, because the one is unrepresentable.  For invert() we have a
special subtract_one() function that handles 1-bit signed fields.

This patch implements the analogous add_one() function so that invert
works.

gcc/ChangeLog:

PR tree-optimization/97555
* range-op.cc (range_tests): Test 1-bit signed invert.
* value-range.cc (subtract_one): Adjust comment.
(add_one): New.
(irange::invert): Call add_one.

gcc/testsuite/ChangeLog:

* gcc.dg/pr97555.c: New test.

Implement three-level optimize_for_size predicates

this patch implements thre two-state optimize_for_size predicates, so with -Os
and with profile feedback for never executed code it returns OPTIMIZE_SIZE_MAX
while in cases we decide to optimize for size based on branch prediction logic
it return OPTIMIZE_SIZE_BALLANCED.

The idea is that for places where we guess that code is unlikely we do not
want to do extreme optimizations for size that leads to many fold slowdowns
(using idiv rather than few shigts or using rep based inlined stringops).

I will update RTL handling code to also support this with BB granuality (which
we don't currently).  LLVM has -Os and -Oz levels where -Oz is our -Os and
LLVM's -Os would ocrrespond to OPTIMIZE_SIZE_BALLANCED.  I wonder if we want
to export this to command line somehow?  For me it would be definitly useful
to test things, I am not sure how "weaker" -Os is desired in practice.

gcc/ChangeLog:

* cgraph.h (cgraph_node::optimize_for_size_p): Return
optimize_size_level.
(cgraph_node::optimize_for_size_p): Update.
* coretypes.h (enum optimize_size_level): New enum.
* predict.c (unlikely_executed_edge_p): Microoptimize.
(optimize_function_for_size_p): Return optimize_size_level.
(optimize_bb_for_size_p): Likewise.
(optimize_edge_for_size_p): Likewise.
(optimize_insn_for_size_p): Likewise.
(optimize_loop_nest_for_size_p): Likewise.
* predict.h (optimize_function_for_size_p): Update declaration.
(optimize_bb_for_size_p): Update declaration.
(optimize_edge_for_size_p): Update declaration.
(optimize_insn_for_size_p): Update declaration.
(optimize_loop_for_size_p): Update declaration.
(optimize_loop_nest_for_size_p): Update declaration.

Refactor SLP instance analysis

This refactors the toplevel entry to analyze an SLP instance to
expose a worker analyzing from a vector of stmts and an SLP entry
kind.

2020-10-26  Richard Biener  <rguenther@suse.de>

* tree-vect-slp.c (enum slp_instance_kind): New.
(vect_build_slp_instance): Split out from...
(vect_analyze_slp_instance): ... this.

Re: error: ‘EVRP_MODE_DEBUG’ was not declared – was: [PUSHED] Ranger classes.

Initialize zerov to match vr-values.c.

* gimple-range.cc (range_of_builtin_call): Initialize zerov to 0.

c++: Implement __is_nothrow_constructible and __is_nothrow_assignable

gcc/c-family/ChangeLog:

* c-common.c (__is_nothrow_assignable): New.
(__is_nothrow_constructible): Likewise.
* c-common.h (RID_IS_NOTHROW_ASSIGNABLE): New.
(RID_IS_NOTHROW_CONSTRUCTIBLE): Likewise.

gcc/cp/ChangeLog:

* cp-tree.h (CPTK_IS_NOTHROW_ASSIGNABLE): New.
(CPTK_IS_NOTHROW_CONSTRUCTIBLE): Likewise.
(is_nothrow_xible): Likewise.
* method.c (is_nothrow_xible): New.
(is_trivially_xible): Tweak.
* parser.c (cp_parser_primary_expression): Handle the new RID_*.
(cp_parser_trait_expr): Likewise.
* semantics.c (trait_expr_value): Handle the new RID_*.
(finish_trait_expr): Likewise.

libstdc++-v3/ChangeLog:

* include/std/type_traits (__is_nt_constructible_impl): Remove.
(__is_nothrow_constructible_impl): Adjust.
(is_nothrow_default_constructible): Likewise.
(__is_nt_assignable_impl): Remove.
(__is_nothrow_assignable_impl): Adjust.

Fix simdclones

gcc/ChangeLog:

PR ipa/97576
* cgraphclones.c (cgraph_node::materialize_clone): Clear stmt
references.
* cgraphunit.c (mark_functions_to_output): Do not clear them here.
* ipa-inline-transform.c (inline_transform): Clear stmt references.
* symtab.c (symtab_node::clear_stmts_in_references): Make recursive
for clones.
* tree-ssa-structalias.c (ipa_pta_execute): Do not clear references.

gcc/testsuite/ChangeLog:

PR ipa/97576
* gcc.c-torture/compile/pr97576.c: New test.

AArch64: Add FLAG for store intrinsics [PR94442]

2020-10-26  Zhiheng Xie  <xiezhiheng@huawei.com>
    Nannan Zheng  <zhengnannan@huawei.com>

gcc/ChangeLog:

* config/aarch64/aarch64-builtins.c: Add FLAG STORE.
* config/aarch64/aarch64-simd-builtins.def: Add proper FLAG
for store intrinsics.

libstdc++: Fix declarations of memalign etc. for freestanding [PR 97570]

libstdc++-v3/ChangeLog:

PR libstdc++/97570
* libsupc++/new_opa.cc: Declare size_t in global namespace.
Remove unused header.

PR tree-optimization/97546 Bail out of find_bswap_or_nop on non-INTEGER_CST sizes

This patch fixes the ICE in the PR by bailing out of find_bswap_or_nop
on poly_int sizes.
I don't think it intends to handle them and from my reading of the code
it's the most appropriate place to reject them
here rather than in the callers.

Bootstrapped and tested on aarch64-none-linux-gnu.

gcc/
PR tree-optimization/97546
* gimple-ssa-store-merging.c (find_bswap_or_nop): Return NULL if
type is not INTEGER_CST.

gcc/testsuite/
PR tree-optimization/97546
* gcc.target/aarch64/sve/acle/general/pr97546.c: New test.

middle-end/97521 - always use single-bit bools in mask vector types

This makes us always use a single-bit boolean type component type
for integer mode mask VECTOR_BOOLEAN_TYPE_P to match the RTL and target
representation.  This aovids the need for magic translation and
the inconsistencies from the translation requirement now that
we expose temporaries of those types on the GIMPLE level.

2020-10-23  Richard Biener  <rguenther@suse.de>

PR middle-end/97521
* expr.c (const_scalar_mask_from_tree): Remove.
(expand_expr_real_1): Always VIEW_CONVERT integer mode
vector constants to an integer type.
* tree.c (build_truth_vector_type_for_mode): Use a single-bit
boolean component type for non-vector-mode mask_mode.

* gcc.target/i386/pr97521.c: New testcase.

x86: Inline strncmp only with -minline-all-stringops

Expand strncmp to "repz cmpsb" only with -minline-all-stringops since
"repz cmpsb" can be much slower than strncmp function implemented with
vector instructions, see

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052

gcc/

PR target/95458
* config/i386/i386-expand.c (ix86_expand_cmpstrn_or_cmpmem):
Return false for -mno-inline-all-stringops.

gcc/testsuite/

PR target/95458
* gcc.target/i386/pr95458-1.c: New test.
* gcc.target/i386/pr95458-2.c: Likewise.

x86: Add cmpmemsi for -minline-all-stringops

We used to expand memcmp to "repz cmpsb" via cmpstrnsi.  It was changed
by

commit 9b0f6f5e511ca512e4faeabc81d2fd3abad9b02f
Author: Nick Clifton <nickc@redhat.com>
Date:   Fri Aug 12 16:26:11 2011 +0000

    builtins.c (expand_builtin_memcmp): Do not use cmpstrnsi pattern.

            * builtins.c (expand_builtin_memcmp): Do not use cmpstrnsi
            pattern.
            * doc/md.texi (cmpstrn): Note that the comparison stops if both
            fetched bytes are zero.
            (cmpstr): Likewise.
            (cmpmem): Note that the comparison does not stop if both of the
            fetched bytes are zero.

Duplicate the cmpstrn pattern for cmpmem.  The only difference is that
the length argument of cmpmem is guaranteed to be less than or equal to
lengths of 2 memory areas.  Since "repz cmpsb" can be much slower than
memcmp function implemented with vector instruction, see

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052

expand cmpmem to "repz cmpsb" only for -minline-all-stringops.

gcc/

PR target/95151
* config/i386/i386-expand.c (ix86_expand_cmpstrn_or_cmpmem): New
function.
* config/i386/i386-protos.h (ix86_expand_cmpstrn_or_cmpmem): New
prototype.
* config/i386/i386.md (cmpmemsi): New pattern.

gcc/testsuite/

PR target/95151
* gcc.target/i386/pr95151-1.c: New test.
* gcc.target/i386/pr95151-2.c: Likewise.
* gcc.target/i386/pr95151-3.c: Likewise.
* gcc.target/i386/pr95151-4.c: Likewise.

IBM Z: Add vcond_mask expander

After adding vec_cmp expanders we have seen various performance
related regression in the testsuite.  These appear to be caused by a
missing vcond_mask definition in the backend.  Fixed with this patch.

The patch fixes the following testsuite fails:

FAIL: gcc.dg/vect/vect-21.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-21.c scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-23.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-23.c scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-24.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-24.c scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-live-6.c -flto -ffat-lto-objects  scan-tree-dump vect "vectorized 1 loops"
FAIL: gcc.dg/vect/vect-live-6.c scan-tree-dump vect "vectorized 1 loops"
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrab\\t%v.?,%v.?,7 6
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesraf\\t%v.?,%v.?,31 6
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrah\\t%v.?,%v.?,15 6
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrlb\\t%v.?,%v.?,7 4
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrlf\\t%v.?,%v.?,31 4
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrlh\\t%v.?,%v.?,15 4
FAIL: gcc.dg/vect/vect-21.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-21.c scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-23.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-23.c scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-24.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-24.c scan-tree-dump-times vect "vectorized 3 loops" 1
FAIL: gcc.dg/vect/vect-live-6.c -flto -ffat-lto-objects  scan-tree-dump vect "vectorized 1 loops"
FAIL: gcc.dg/vect/vect-live-6.c scan-tree-dump vect "vectorized 1 loops"
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrab\\t%v.?,%v.?,7 6
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesraf\\t%v.?,%v.?,31 6
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrah\\t%v.?,%v.?,15 6
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrlb\\t%v.?,%v.?,7 4
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrlf\\t%v.?,%v.?,31 4
FAIL: gcc.target/s390/vector/vcond-shift.c scan-assembler-times vesrlh\\t%v.?,%v.?,15 4

gcc/ChangeLog:

* config/s390/vector.md ("vcond_mask_<mode><mode>"): New expander.

middle-end/97554 - avoid overflow in alloc size compute

This avoids overflow in the allocation size computations in
sbitmap_vector_alloc when the result exceeds 2GB.

2020-10-26  Richard Biener  <rguenther@suse.de>

* sbitmap.c (sbitmap_vector_alloc): Use size_t for byte
quantities to avoid overflow.

tree-optimization/97539 - reset out-of-loop debug uses before peeling

This makes sure to reset out-of-loop debug uses before vectorizer
loop peeling as we cannot make sure to retain the use-def dominance
relationship when there are no LC SSA nodes.

2020-10-26  Richard Biener  <rguenther@suse.de>

PR tree-optimization/97539
* tree-vect-loop-manip.c (vect_do_peeling): Reset out-of-loop
debug uses before peeling.

* gcc.dg/pr97539.c: New testcase.

Make default duplicate and insert methods of summaries abort; fix fallout

the default duplicate and insert methods of sumaries produce empty
summary that is not useful for anything and makes it easy to introduce
bugs.

This patch makes the default hooks to abort and summaries that do not
need dupicaito/insertion disable the corresponding hooks. I also
implemented missing insertion hook for ipa-sra which forced me to move
analysis out of anonymous namespace.

2020-10-23  Jan Hubicka  <hubicka@ucw.cz>

* cgraph.h (struct cgraph_node): Make ipa_transforms_to_apply vl_ptr.
* ipa-inline-analysis.c (initialize_growth_caches): Disable insertion
and duplication hooks.
* ipa-inline-transform.c (clone_inlined_nodes): Clear
ipa_transforms_to_apply.
(save_inline_function_body): Disable insertion hoook for
ipa_saved_clone_sources.
* ipa-prop.c (ipcp_transformation_initialize): Disable insertion hook.
* ipa-prop.h (ipa_node_params_t): Disable insertion hook.
* ipa-reference.c (propagate): Disable insertion hoook.
* ipa-sra.c (ipa_sra_summarize_function): Move out of anonymous
namespace.
(ipa_sra_function_summaries::insert): New virtual function.
* passes.c (execute_one_pass): Do not add transforms to inline clones.
* symbol-summary.h (function_summary_base): Make insert and duplicate
hooks fail instead of silently producing empty summaries; add way to
disable duplication hooks
(call_summary_base): Likewise.
* tree-nested.c (nested_function_info::get_create): Disable insertion
hooks
(maybe_record_nested_function): Likewise.

libstdc++: Add missing exception-specifications in shared_ptr

libstdc++-v3/ChangeLog:

* include/bits/shared_ptr_base.h
(_Sp_counted_base::_M_add_ref_lock_nothrow(): Add noexcept to
definitions to match declaration.
(__shared_count(const __weak_count&, nothrow_t)): Add noexcept
to declaration to match definition.

[Ada] Handle Iterated_Component_Association with Others_Choice

gcc/ada/

* exp_aggr.adb (Build_Array_Aggr_Code): If the aggregate
includes an Others_Choice in an association that is an
Iterated_Component_Association, generate a proper loop for it.

[Ada] Further small edition to documentation of Ada.Text_IO.Fixed_IO

gcc/ada/

* libgnat/a-tifiio.adb: Add missing sign in documentation.
* libgnat/s-imgrea.ads: Minor fixes in commentary.

[Ada] Replace GNAT_Extended_Ravenscar profile name

gcc/ada/

* doc/gnat_rm/implementation_defined_pragmas.rst: Include
"Jorvik" in pragma Profile description.
* gnat_rm.texi: Regenerate.

[Ada] Avoid crash on use of Ada 2020 feature

gcc/ada/

* sem_attr.adb (Check_Image_Type): Remove "|", so the compiler
will not crash.
* errout.ads: Improve comment. This has nothing to do with
-gnatQ.

[Ada] Further small edition to documentation of Ada.Text_IO.Fixed_IO

gcc/ada/

* libgnat/a-tifiio.adb: Minor editions to documentation.

[Ada] Fix freezing of previous contracts

gcc/ada/

* contracts.adb (Causes_Contract_Freezing): Extend condition to
match the one in Analyze_Subprogram_Body_Helper. This routine is
used both as an assertion at the very start of
Freeze_Previous_Contracts and to detect previous declaration for
which Freeze_Previous_Contracts has been executed.

[Ada] Another small edition to documentation of Ada.Text_IO.Fixed_IO

gcc/ada/

* libgnat/a-tifiio.adb: Move around documentaton paragraph.

[Ada] Fix harmless assertion failure in GNATprove mode

gcc/ada/

* inline.adb (Establish_Actual_Mapping_For_Inlined_Call): Add
guard for a call to Set_Last_Assignment with the same condition
as the assertion in that routine and explain why this guard
fails in GNATprove mode.

[Ada] Document characteristics of ordinary fixed point types

gcc/ada/

* doc/gnat_rm/implementation_defined_characteristics.rst: Adjust
the entries of 3.5.9(8) and 3.5.9(10).
* gnat_rm.texi: Regenerate.

[Ada] Relax assertion on Small in Ada.Text_IO.Fixed_IO

gcc/ada/

* libgnat/a-tifiio.adb: Change the range of supported Small
values.
(E0, E1, E2): Adjust factors.
(Exact): Return false if the Small does not fit in 64 bits.

[Ada] Fix Accept_Socket and Connect_Socket timeout support

gcc/ada/

* libgnat/g-socket.adb (Wait_On_Socket): Boolean parameter
For_Read changed to Event parameter of type
GNAT.Sockets.Poll.Wait_Event_Set.  Implementation is simplified
and based on call to GNAT.Sockets.Poll.Wait now.

[Ada] Minor editions to documentation of Ada.Text_IO.Fixed_IO

gcc/ada/

* libgnat/a-tifiio.adb: Minor editions to documentation.

[Ada] Fix GNATprove crash on generics with access types

gcc/ada/

* sem_ch12.adb (Restore_Private_Views): Do not lose the
information provided by Is_Generic_Actual_Type in GNATprove
mode.

[Ada] Suppress warnings on unreferenced parameters of dispatching ops

gcc/ada/

* sem_warn.adb (Warn_On_Unreferenced_Entity): Suppress warning
on formal parameters of all dispatching operations.

gcc/testsuite/

* gnat.dg/warn14.adb: Update expectations.

[Ada] Fix typos in error message for array delta aggregates

gcc/ada/

* sem_aggr.adb (Resolve_Delta_Array_Aggregate): Fix typos in
error message.

[Ada] Restore hex addresses and improve symbolic backtraces

gcc/ada/

* libgnat/s-dwalin.adb (Symbolic_Traceback): Always emit the hex
address at the beginning of an entry if suppression is not
requested. Consistently output a "???" for the subprogram name
when it is unknown.

[Ada] x86-lynx178elf - gcc build fails

gcc/ada/

* s-oscons-tmplt.c (_nfds_t): Use sizeof (unsigned long int).

[Ada] Fix interference between iterated element-and-component association

gcc/ada/

* par-ch4.adb (P_Iterated_Component_Association): Move code for
iterated_element_association to
Build_Iterated_Element_Association.

[Ada] Do not instantiate generic bodies outside of main unit in GNATprove

gcc/ada/

* sem_ch12.adb (Needs_Body_Instantiated): In GNATprove mode, do
not instantiate bodies outside of the main unit.

[Ada] Spurious error on Old attribute reference in delta aggregate

gcc/ada/

* sem_aggr.adb (Resolve_Delta_Array_Aggregate): For an
association that is an iterated component association, attach
the copy of the expression to the tree prior to analysis, in
order to preserve its context. This is needed when verifying
static semantic rules that depend on context, for example that a
use of 'Old appears only within a postcondition.

[Ada] gnatpp: Document that --no-comments-fill is now the default

gcc/ada/

* doc/gnat_ugn/gnat_utility_programs.rst: Document that
--no-comments-fill is now the default.

[Ada] Missing errors on extension aggregates with unknown discriminants

gcc/ada/

* sem_aggr.adb (Resolve_Extension_Aggregate): When testing for
an aggregate that is illegal due to having an ancestor type that
has unknown discriminants, add an "or else" condition testing
whether the aggregate type has unknown discriminants and that
Partial_View_Has_Unknown_Discr is also set on the ancestor type.
Extend the comment, including adding ??? about a possible
simpler test.

[Ada] Delete: set Position to No_Element

gcc/ada/

* libgnat/a-cihama.adb, libgnat/a-cohama.adb,
libgnat/a-cohase.adb (Delete): Set Position.Position, and
assert.

[Ada] Improve error on missing with clause

gcc/ada/

* sem_ch8.adb (Find_Direct_Name.Undefined): Handle known unit
names with 3 selectors.

[Ada] Fix SPARK expansion of iterated_component_assoc in delta aggregate

gcc/ada/

* exp_spark.adb (Expand_SPARK_Delta_Or_Update): Add missing call
to Enter_Name, just like it is called for
iterated_component_association in Expand_SPARK_N_Aggregate.

[Ada] Cleanup SPARK expansion of aggregates with iterated_component_assoc

gcc/ada/

* exp_spark.adb (Expand_SPARK_Delta_Or_Update): Reuse local
constant Expr and the Choice_List routine.
(Expand_SPARK_N_Aggregate): Reuse local constant Expr.

[Ada] Fix typos in comments about parsing iterated_component_association

gcc/ada/

* par-ch4.adb (P_Iterated_Component_Association): Fix typos in
comments.

[Ada] AI12-0395: Allow aspect_specifications on formal parameters

gcc/ada/

* par-ch6.adb (P_Formal_Part): Ada 2020 supports scanning
aspects on formal parameters.
* doc/gnat_rm/implementation_defined_aspects.rst (Aspect
Unreferenced): Update documentation.
* gnat_rm.texi: Regenerate.

[Ada] Crash on membership test in expression function

gcc/ada/

* freeze.adb (Freeze_Type_Refs): When an entity in an expression
function is a type, freeze the entity and not just its type,
which would be incomplete when the type is derived and/or
tagged.

[Ada] Handle subtype_indication in 'Update for arrays

gcc/ada/

* exp_attr.adb (Expand_Update_Attribute): Handle
subtype_indication just like in Expand_Delta_Array_Aggregate.

Add overloaded debug_bb and debug_bb_n with dump flags

Add overloads that accept a flags argument so we can print
debug_bb_n (5, TDF_DETAILS) in gdb, also the debug_bb_slim
variant would then be just a forwarder.

gcc/ChangeLog:

2020-10-26  Xionghu Luo  <luoxhu@linux.ibm.com>

* cfg.c (debug_bb): New overloaded function.
(debug_bb_n): New overloaded function.
* cfg.h (debug_bb): New declaration.
(debug_bb_n): New declaration.
* print-rtl.c (debug_bb_slim): Call debug_bb with flags.

Daily bump.

Ada, Darwin, PowerPC : Fix bootstrap after 128 int changes.

The GNATRTL_128BIT_PAIRS/OBJS need to be added for 64bit
multilibs on powerpc-darwin, and for powerpc64-darwin.

gcc/ada/ChangeLog:

* Makefile.rtl: Add GNATRTL_128BIT_PAIRS/OBJS for 64bit
PowerPC Darwin cases.

Correct decls for functions which do not pass actual arguments.

A wrong decl for findloc caused segfaults at runtime on
Darwin for ARM; however, this is only a symptom of a larger
disease: The declarations for our library functions are often
inconsistent.  This patch solves that problem for the functions
specifically for the functions for which we do not pass optional
arguments, i.e. findloc and (min|max)loc.

It works by saving the symbols of the specific functions in
gfc_intrinsic_namespace and by generating the formal argument
lists from the actual argument lists.  Because symbols are
re-used, so are the backend decls.

gcc/fortran/ChangeLog:

PR fortran/97454
* gfortran.h (gfc_symbol): Add pass_as_value flag.
(gfc_copy_formal_args_intr): Add optional argument
copy_type.
(gfc_get_intrinsic_function_symbol): Add prototype.
(gfc_find_intrinsic_symbol): Add prototype.
* intrinsic.c (gfc_get_intrinsic_function_symbol): New function.
(gfc_find_intrinsic_symbol): New function.
* symbol.c (gfc_copy_formal_args_intr): Add argument. Handle case
where the type needs to be copied from the actual argument.
* trans-intrinsic.c (remove_empty_actual_arguments): New function.
(specific_intrinsic_symbol): New function.
(gfc_conv_intrinsic_funcall): Use it.
(strip_kind_from_actual): Adjust so that the expression pointer
is set to NULL.
(gfc_conv_intrinsic_minmaxloc): Likewise.
(gfc_conv_intrinsic_minmaxval): Adjust removal of dim.
* trans-types.c (gfc_sym_type): If sym->pass_as_value is set, do
not pass by reference.

Daily bump.

Update check for working assembler --gdwarf-4 option

Rename HAVE_AS_WORKING_DWARF_4_FLAG to HAVE_AS_WORKING_DWARF_N_FLAG
Don't set HAVE_AS_WORKING_DWARF_N_FLAG if --gdwarf-5/--gdwarf-4 generate
an extra assembly input file in debug info from compiler generated
.debug_line or fail with the APP marker:

https://sourceware.org/bugzilla/show_bug.cgi?id=25878
https://sourceware.org/bugzilla/show_bug.cgi?id=26740
https://sourceware.org/bugzilla/show_bug.cgi?id=26778

Also replace success with dwarf4_success in the 32-bit --gdwarf-4 check.

PR bootstrap/97451
* configure.ac (HAVE_AS_WORKING_DWARF_4_FLAG): Renamed to ...
(HAVE_AS_WORKING_DWARF_N_FLAG): This.  Don't define if there is
an extra assembly input file in debug info.  Replace success
with dwarf4_success in the 32-bit --gdwarf-4 check.
* dwarf2out.c (asm_outputs_debug_line_str): Check
HAVE_AS_WORKING_DWARF_N_FLAG instead of
HAVE_AS_WORKING_DWARF_4_FLAG.
* gcc.c (ASM_DEBUG_SPEC): Likewise.
(ASM_DEBUG_OPTION_SPEC): Likewise.
* config.in: Regenerated.
* configure: Likewise.

c++: Fix verify_ctor_sanity ICE [PR96241]

The code added in r10-6437 caused us to create a CONSTRUCTOR when we're
{}-initializing an aggregate.  Then we pass this new CONSTRUCTOR down to
cxx_eval_constant_expression which, if the CONSTRUCTOR isn't TREE_CONSTANT
or reduced_constant_expression_p, calls cxx_eval_bare_aggregate.  In
this case the CONSTRUCTOR wasn't reduced_constant_expression_p because
for r_c_e_p a CONST_DECL isn't good enough so it returns false.  So we
go to cxx_eval_bare_aggregate where we crash, because ctx->ctor wasn't
set up properly.  So my fix is to do so.  Since we're value-initializing,
I'm not setting CONSTRUCTOR_NO_CLEARING.  To avoid keeping a garbage
constructor around, I call free_constructor in case the evaluation did
not use it.

gcc/cp/ChangeLog:

PR c++/96241
* constexpr.c (cxx_eval_array_reference): Set up ctx->ctor if we
are initializing an aggregate.  Call free_constructor on the new
CONSTRUCTOR if it isn't returned from cxx_eval_constant_expression.

gcc/testsuite/ChangeLog:

PR c++/96241
* g++.dg/cpp0x/constexpr-96241.C: New test.
* g++.dg/cpp1y/constexpr-96241.C: New test.

Handle undefined ranges in get_size_range.

An undefined range was leaking through to the end of this function,
which leads us to use an uninitialized wide_int.

gcc/ChangeLog:

PR tree-optimization/97538
* calls.c (get_size_range): Handle undefined ranges.

gcc/testsuite/ChangeLog:

* g++.dg/pr97538.C: New test.

cgraph: move former_thunk_p out of CHECKING_P macro.

This fixes the following failure:

ld: cgraph.o: in function `cgraph_edge::verify_corresponds_to_fndecl(tree_node*)':
gcc/cgraph.c:3067: undefined reference to `cgraph_node::former_thunk_p()'
ld: cgraph.o: in function `clone_of_p':

gcc/ChangeLog:

* cgraph.c (cgraph_node::former_thunk_p): Move out of CHECKING_P
macro.

[RS6000] altivec style lvx/stvx addresses vs power10

gcc.target/powerpc/fold-vec-st-pixel.c and other testcases fail on
power10, generating
addi 9,5,12
rldicr 9,9,0,59
stxv 34,0(9)
rather than
addi 5,5,12
stvx 2,0,5
for an altivec lvx/stvx style address.

The problem starts with fwprop creating
(insn 9 4 0 2 (set (mem:V8HI (and:DI (plus:DI (reg/v/f:DI 121 [ vpp ])
                    (const_int 12 [0xc]))
                (const_int -16 [0xfffffffffffffff0])) [0 MEM <vector(8) short int> [(void *)_4 & -16B]+0 S16 A128])
        (reg/v:V8HI 120 [ vp1 ])) "pixel.c":6:10 1237 {vsx_movv8hi_64bit}
which is finally thrown out as invalid by lra.  lra of course does that
by reloading the entire address.

fwprop creates the invalid address due to rs6000_legitimate_address_p
trimming off the outer AND of altivec style addresses before applying
other predicates.  address_is_prefixed then allows the inner address.

Now at the time the AND stripping was added (git commit 850e8d3d56d),
rs6000_legitimate_address looked a lot simpler.  This patch allows
through just those addresses that were legitimate in those simpler
days.

* config/rs6000/rs6000.c (rs6000_legitimate_address_p): Limit
AND addressing to just lvx/stvx style addresses.

[RS6000] Power10 ICE running gcc.target/powerpc/ppc-ne0-1.c

* config/rs6000/rs6000.md (cstore<mode>4): Don't call
rs6000_emit_int_cmove for power10 when -mno-isel.

Daily bump.

net/http/cgi: merge upstream changes to default env vars

Incorporate upstream modifications to the cgi package's set of rules
about which environment variables should be inherited by child processes
by default on each platform. In particular this permits tests to pass on
NetBSD by preserving the value of the LD_LIBRARY_PATH environment
variable.

This is a partial backport of the following upstream CLs:

    https://golang.org/cl/263802
    https://golang.org/cl/263577
    https://golang.org/cl/254740

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/264097

testsuite: Fix -Wsizeof-array-div tests.

gcc/testsuite/ChangeLog:

* c-c++-common/Wsizeof-array-div1.c: Expect certain warnings on
lp64 targets only.
* g++.dg/warn/Wsizeof-array-div2.C: Only run on lp64 targets.

Move thunks out of cgraph_node

this patch moves thunk_info out of cgraph_node into a symbol summary.
I also moved it to separate hearder file since cgraph.h became really too
fat.  I plan to contiue with similar breakup in order to cleanup interfaces
and reduce WPA memory footprint (symbol table now consumes more memory than
trees)

gcc/ChangeLog:

2020-10-23  Jan Hubicka  <hubicka@ucw.cz>

* Makefile.in: Add symtab-thunks.o
(GTFILES): Add symtab-thunks.h and symtab-thunks.cc; remove cgraphunit.c
* cgraph.c: Include symtab-thunks.h.
(cgraph_node::create_thunk): Update
(symbol_table::create_edge): Update
(cgraph_node::dump): Update
(cgraph_node::call_for_symbol_thunks_and_aliases): Update
(set_nothrow_flag_1): Update
(set_malloc_flag_1): Update
(set_const_flag_1): Update
(collect_callers_of_node_1): Update
(clone_of_p): Update
(cgraph_node::verify_node): Update
(cgraph_node::function_symbol): Update
(cgraph_c_finalize): Call thunk_info::release.
(cgraph_node::has_thunk_p): Update
(cgraph_node::former_thunk_p): Move here from cgraph.h; reimplement.
* cgraph.h (struct cgraph_thunk_info): Rename to symtab-thunks.h.
(cgraph_node): Remove thunk field; add thunk bitfield.
(cgraph_node::expand_thunk): Move to symtab-thunks.h
(symtab_thunks_cc_finalize): Declare.
(cgraph_node::has_gimple_body_p): Update.
(cgraph_node::former_thunk_p): Update.
* cgraphclones.c: Include symtab-thunks.h.
(duplicate_thunk_for_node): Update.
(cgraph_edge::redirect_callee_duplicating_thunks): Update.
(cgraph_node::expand_all_artificial_thunks): Update.
(cgraph_node::create_edge_including_clones): Update.
* cgraphunit.c: Include symtab-thunks.h.
(vtable_entry_type): Move to symtab-thunks.c.
(cgraph_node::analyze): Update.
(analyze_functions): Update.
(mark_functions_to_output): Update.
(thunk_adjust): Move to symtab-thunks.c
(cgraph_node::expand_thunk): Move to symtab-thunks.c
(cgraph_node::assemble_thunks_and_aliases): Update.
(output_in_order): Update.
(cgraphunit_c_finalize): Do not clear vtable_entry_type.
(cgraph_node::create_wrapper): Update.
* gengtype.c (open_base_files): Add symtab-thunks.h
* ipa-comdats.c (propagate_comdat_group): UPdate.
(ipa_comdats): Update.
* ipa-cp.c (determine_versionability): UPdate.
(gather_caller_stats): Update.
(count_callers): Update
(set_single_call_flag): Update
(initialize_node_lattices): Update
(call_passes_through_thunk_p): Update
(call_passes_through_thunk): Update
(propagate_constants_across_call): Update
(find_more_scalar_values_for_callers_subset): Update
(has_undead_caller_from_outside_scc_p): Update
* ipa-fnsummary.c (evaluate_properties_for_edge): Update.
(compute_fn_summary): Update.
(inline_analyze_function): Update.
* ipa-icf.c: Include symtab-thunks.h.
(sem_function::equals_wpa): Update.
(redirect_all_callers): Update.
(sem_function::init): Update.
(sem_function::parse): Update.
* ipa-inline-transform.c: Include symtab-thunks.h.
(inline_call): Update.
(save_inline_function_body): Update.
(preserve_function_body_p): Update.
* ipa-inline.c (inline_small_functions): Update.
* ipa-polymorphic-call.c: Include alloc-pool.h, symbol-summary.h,
symtab-thunks.h
(ipa_polymorphic_call_context::ipa_polymorphic_call_context): Update.
* ipa-pure-const.c: Include symtab-thunks.h.
(analyze_function): Update.
* ipa-sra.c (check_for_caller_issues): Update.
* ipa-utils.c (ipa_reverse_postorder): Update.
(ipa_merge_profiles): Update.
* ipa-visibility.c (non_local_p): Update.
(cgraph_node::local_p): Update.
(function_and_variable_visibility): Update.
* ipa.c (symbol_table::remove_unreachable_nodes): Update.
* lto-cgraph.c: Include alloc-pool.h, symbol-summary.h and
symtab-thunks.h
(lto_output_edge): Update.
(lto_output_node): Update.
(compute_ltrans_boundary): Update.
(output_symtab): Update.
(verify_node_partition): Update.
(input_overwrite_node): Update.
(input_node): Update.
* lto-streamer-in.c (fixup_call_stmt_edges): Update.
* symtab-thunks.cc: New file.
* symtab-thunks.h: New file.
* toplev.c (toplev::finalize): Call symtab_thunks_cc_finalize.
* trans-mem.c (ipa_tm_mayenterirr_function): Update.
(ipa_tm_execute): Update.
* tree-inline.c (expand_call_inline): Update.
* tree-nested.c (create_nesting_tree): Update.
(convert_all_function_calls): Update.
(gimplify_all_functions): Update.
* tree-profile.c (tree_profiling): Update.
* tree-ssa-structalias.c (associate_varinfo_to_alias): Update.
* tree.c (free_lang_data_in_decl): Update.
* value-prof.c (init_node_map): Update.

gcc/c-family/ChangeLog:

2020-10-23  Jan Hubicka  <hubicka@ucw.cz>

* c-common.c (c_common_finalize_early_debug): Update for new thunk api.

gcc/d/ChangeLog:

2020-10-23  Jan Hubicka  <hubicka@ucw.cz>

* decl.cc (finish_thunk): Update for new thunk api.

gcc/lto/ChangeLog:

2020-10-23  Jan Hubicka  <hubicka@ucw.cz>

* lto-partition.c (add_symbol_to_partition_1): Update for new thunk
api.

c, c++: Implement -Wsizeof-array-div [PR91741]

This patch implements a new warning, -Wsizeof-array-div.  It warns about
code like

  int arr[10];
  sizeof (arr) / sizeof (short);

where we have a division of two sizeof expressions, where the first
argument is an array, and the second sizeof does not equal the size
of the array element.  See e.g. <https://www.viva64.com/en/examples/v706/>.

Clang makes it possible to suppress the warning by parenthesizing the
second sizeof like this:

  sizeof (arr) / (sizeof (short));

so I followed suit.  In the C++ FE this was rather easy, because
finish_parenthesized_expr already set TREE_NO_WARNING.  In the C FE
I've added a new tree code, PAREN_SIZEOF_EXPR, to discern between the
non-() and () versions.

This warning is enabled by -Wall.  An example of the output:

x.c:5:23: warning: expression does not compute the number of elements in this array; element type is ‘int’, not ‘short int’ [-Wsizeof-array-div]
    5 |   return sizeof (arr) / sizeof (short);
      |          ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
x.c:5:25: note: add parentheses around ‘sizeof (short int)’ to silence this warning
    5 |   return sizeof (arr) / sizeof (short);
      |                         ^~~~~~~~~~~~~~
      |                         (             )
x.c:4:7: note: array ‘arr’ declared here
    4 |   int arr[10];
      |       ^~~

gcc/c-family/ChangeLog:

PR c++/91741
* c-common.c (verify_tree): Handle PAREN_SIZEOF_EXPR.
(c_common_init_ts): Likewise.
* c-common.def (PAREN_SIZEOF_EXPR): New tree code.
* c-common.h (maybe_warn_sizeof_array_div): Declare.
* c-warn.c (sizeof_pointer_memaccess_warning): Unwrap NOP_EXPRs.
(maybe_warn_sizeof_array_div): New function.
* c.opt (Wsizeof-array-div): New option.

gcc/c/ChangeLog:

PR c++/91741
* c-parser.c (c_parser_binary_expression): Implement -Wsizeof-array-div.
(c_parser_postfix_expression): Set PAREN_SIZEOF_EXPR.
(c_parser_expr_list): Handle PAREN_SIZEOF_EXPR like SIZEOF_EXPR.
* c-tree.h (char_type_p): Declare.
* c-typeck.c (char_type_p): No longer static.

gcc/cp/ChangeLog:

PR c++/91741
* typeck.c (cp_build_binary_op): Implement -Wsizeof-array-div.

gcc/ChangeLog:

PR c++/91741
* doc/invoke.texi: Document -Wsizeof-array-div.

gcc/testsuite/ChangeLog:

PR c++/91741
* c-c++-common/Wsizeof-pointer-div.c: Add dg-warning.
* c-c++-common/Wsizeof-array-div1.c: New test.
* g++.dg/warn/Wsizeof-array-div1.C: New test.
* g++.dg/warn/Wsizeof-array-div2.C: New test.

PR middle-end/97552 - missing waning passing null to a VLA argument declared [static]

gcc/ChangeLog:

PR middle-end/97552
* attribs.c (init_attr_rdwr_indices): Handle static VLA parameters.

gcc/c/ChangeLog:

PR middle-end/97552
* c-decl.c (get_parm_array_spec): Handle static VLA parameters.

gcc/testsuite/ChangeLog:

PR middle-end/97552
* gcc.dg/Wvla-parameter-2.c: Adjust text of expected warning.
* gcc.dg/Wnonnull-5.c: New test.

PR c/97463 - ICE in warn_parm_ptrarray_mismatch on an incompatible function redeclaration

gcc/c-family/ChangeLog:

PR c/97463
* c-warn.c (warn_parm_ptrarray_mismatch): Move null test earlier.

gcc/testsuite/ChangeLog:

PR c/97463
* gcc.dg/pr97463.c: New test.

Darwin, Ada : Fix bootstrap after stat entry changes.

Darwin struct stat has timeval entry fields for file access and
modification times but they are named differently from those
on Linux.

As a workaround define the field names to the Darwin equivalent.

gcc/ada/ChangeLog:

* adaint.c: On Darwin platforms, define st_atim to
st_atimespec. Likwise st_mtim to st_mtimespec.

Fix typo in recent change to Makefile.rtl (bis)

gcc/ada/ChangeLog:
* Makefile.rtl (EXTRA_GNATRTL_NONTASKING_OBJS) [IA64/Linux]: Fix typo.

Fix typo in recent change to Makefile.rtl

gcc/ada/ChangeLog:
* Makefile.rtl (EXTRA_GNATRTL_NONTASKING_OBJS) [IA64/Linux]: Fix typo.

Link with the configured net lib on vxworks7

The net library is configurable on vxworks7. Pick the library
to include in link closures in accordance with the availability
of a revealing header file, using the recently introduced
if-exist-then-else spec builtin function.

2021-10-23  Douglas Rupp  <rupp@adacore.com>

gcc/
* config/vxworks.h (VXWORKS_NET_LIBS_RTP): Use -lrtnet if
rtnetStackLib.h is available,fallback to -lnet otherwise.

testsuite: Correct vec-rlmi-rlnm.c testsuite expected result

gcc/testsuite/ChangeLog:

* gcc.target/powerpc/vec-rlmi-rlnm.c: Update xxlor expect.

Fix overzealous gthread support inhibition for vxworks

The tests for macros possibly defined in gthr.h needs to
be performed after the corresponding #include. This was tested
together with the previous updates to gthr-vxworks-thread.c
and gthr-vxworks-cond.c and was meant to be squashed with them.

2010-10-23  Rasmus Villemoes  <rv@rasmusvillemoes.dk>

libgcc/
* config/gthr-vxworks-thread.c: #include gthr.h before
testing the guard defined there.
* config/gthr-vxworks-cond.c: Likewise.

Add a if-exists-then-else built-in spec function

This patch adds an if-exists-then-else
builtin spec function, which tests for the existence of
a file and returns one or the other of the following
arguments depending on the result of the test.

This differs from the existing if-exists or
if-exists-else function which return the name of the
tested file if it exists.

This new function is of help to a forthcoming change for
VxWorks where we check for the presence of a specific header
file to decide the name of a library to include in the link
closure.

2020-10-23  Douglas Rupp  <rupp@adacore.com>

gcc/
* gcc.c (if-exists-then-else): New built-in spec function.
* doc/invoke.texi: Document it.

rs6000: Fix extraneous characters in the documentation

Replace them with a whitespace in order to avoid artifacts in the HTML
document.

2020-08-19  Tulio Magno Quites Machado Filho  <tuliom@linux.ibm.com>

gcc/
* doc/extend.texi (PowerPC Built-in Functions): Replace
extraneous characters with whitespace.

gcov: fix reading of zero sections.

I noticed that during coverage build of binutils.

gcc/ChangeLog:

* gcov.c (read_count_file): Never call gcov_sync with a negative
value.

testsuite: Add noexcept(false) to throwing destructor

I think this test is intended to check this property of the C++
standard:

"If a destructor directly invoked by stack unwinding exits via an
exception, std::terminate is invoked." [except.throw]

Since C++11 any exception escaping a destructor will call
std::terminate, so the test would terminate even if the unwinding
behaviour was wrong.

Give the destructor a potentially-throwing exception specification,
so that we know that terminate was called for the right reason.

gcc/testsuite/ChangeLog:

* g++.dg/compat/eh/filter2_y.C: Add noexcept(false) to
destructor.

libstdc++: Apply proposed resolutions for LWG 3428, 3447

libstdc++-v3/ChangeLog:

* include/std/ranges (single_view::single_view): Mark the
in place constructor explicit as per LWG 3428.
(take_view): Remove the constraint on the deduction guide's
template parameter as per LWG 3447.

more wraplf for aux long long float: s390, sparc and powerpc

The wraplf version of Ada.Numerics.Aux_Long_Long_Float is needed on
s390* as well.  Also add it to sparc*-linux-gnu and powerpc-darwin,
that were missed when adding it for sparc and ppc targets.

for  gcc/ada/ChangeLog

PR ada/97504
* Makefile.rtl (LIBGNAT_TARGET_PAIRS): Select wraplf version
of Aux_Long_Long_Float for s390 and remaining sparc and
powerpc targets.

[Ada] Sockets.Poll implementation

gcc/ada/

* Makefile.rtl (GNATRTL_SOCKETS_OBJS): New object
g-socpol$(objext) New source files noted: g-socpol.adb,
g-socpol.ads, g-socpol__dummy.adb, g-socpol__dummy.ads,
g-sopowa.adb, g-sopowa__posix.adb, g-sopowa__mingw.adb,
g-spogwa.adb, g-spogwa.ads.
* impunit.adb (Non_Imp_File_Names_95): New base filename
g-socpol in "GNAT Library Units" section for GNAT.Sockets.Poll
unit.
* libgnat/g-socket.ads, libgnat/g-socket.adb:
(Raise_Socket_Error): Moved from body to private part of
specification to use in GNAT.Sockets.Poll.
* libgnat/g-socpol.ads, libgnat/g-socpol.adb: Main unit of the
implementation.
* libgnat/g-socpol__dummy.ads, libgnat/g-socpol__dummy.adb:
Empty unit for the systems without sockets support.
* libgnat/g-spogwa.ads, libgnat/g-spogwa.adb: Generic unit
implementing sockets poll on top of select system call.
* libgnat/g-sopowa.adb (Wait): Separate implementation for
operation systems with poll system call support.
* libgnat/g-sopowa__posix.adb (Wait): Separate implementation
for POSIX select system call.
* libgnat/g-sopowa__mingw.adb (Wait): Separate implementation
for Windows select system call.
* gsocket.h (_WIN32_WINNT): Increase to 0x0600 for winsock2.h to
allow WSAPoll related definitions.
* s-oscons-tmplt.c: Fix comment next to #endif for
#if defined (__linux__) || defined (__ANDROID__) line.  Include
<poll.h> for all except VxWorks and Windows.
(SIZEOF_nfds_t): New definition.
(SIZEOF_fd_type): New definition.
(SIZEOF_pollfd_events): New definition.
(POLLIN, POLLPRI, POLLOUT, POLLERR, POLLHUP, POLLNVAL): New
definitions for VxWorks to be able to emulate poll on top of
select in it.  Define POLLPRI as zero on Windows as it is not
supported there.
(Poll_Linkname): New definition, because the poll system call
has different name in Windows and POSIX.

[Ada] Further Ada 2020 work on accessibility checking

gcc/ada/

* checks.adb (Apply_Accessibility_Check): Skip checks against
the extra accessibility of a function result when in Ada 2005
mode or earlier.
* exp_ch3.adb (Build_Initialization_Call): Modify accessibility
level calls to use Accessibility_Level.
(Expand_N_Object_Declaration): Modify accessibility level calls
to use Accessibility_Level.
* exp_ch4.adb (Expand_Allocator_Expression): Add static check
for anonymous access discriminants. Remove unneeded propagation
of accessibility actual.
(Expand_N_In): Modify accessibility level calls to use
Accessibility_Level.
(Expand_N_Type_Conversion): Modify accessibility level calls to
use Accessibility_Level.
* exp_ch5.adb (Expand_N_Assignment_Statement): Modify
accessibility level calls to use Accessibility_Level.
* exp_ch6.adb (Expand_Call_Helper): Rewrite accessibility
calculation for the extra accessibility of result actual in
function calls, and modify accessibility level calls to use
Accessibility_Level.
(Check_Against_Result_Level): Removed.
* exp_ch9.adb (Expand_N_Requeue_Statement): Add dynamic
accessibility check for requeues
* sem_attr.adb (Resolve_Attribute): Modify accessibility level
calls to use Accessibility_Level.
* sem_ch13.adb (Associate_Storage_Pool): Modify accessibility
level calls to use Accessibility_Level.
* sem_ch4.adb (Analyze_Call): Add static check for explicitly
aliased formals in function calls within return statements.
* sem_ch6.adb (Check_Return_Construct_Accessibility): Rewrite
routine to account for non-aggregate return objects.
(Generate_Minimum_Accessibility): Created.
(Analyze_Call): Modify accessibility level calls to use
Accessibility_Level.
(Analyze_Subprogram_Body_Helper): Add generation of minimum
accessibility for the extra accessibility of the function
result.
* sem_ch9.adb (Analyze_Requeue): Modify accessibility level
calls to use Accessibility_Level.
* sem_res.adb: (Check_Aliased_Parameters): Modify accessibility
level calls to use Accessibility_Level.
(Valid_Conversion): Modify accessibility level calls to use
Accessibility_Level.
* sem_util.adb, sem_util.ads (Accessibility_Level_Helper):
Renamed to Accessibility_Level, add detection for functions in
prefix notation, and add cases where to return zero when
specified. Modified to take new, more descriptive, parameters.
(Accessibility_Level): Created.
(Function_Call_Level): Removed.
(Function_Call_Or_Allocator_Level): Created to centralize the
calculation accessibility levels for function calls and
allocators.
(Static_Accessibility_Level): Removed.
(Dynamic_Accessibility_Level): Removed.
(Get_Dynamic_Accessibility): Renamed from Get_Accessibility.
(In_Return_Value): Created to determine if a given expression
contributes to the current function's return value.
(Is_Master): Created.
(Is_Explicitly_Aliased): Created

[Ada] gnatpp: Document --no-comments-fill

gcc/ada/

* doc/gnat_ugn/gnat_utility_programs.rst: Document
--no-comments-fill.

[Ada] Reject illegal syntax in pragma Contract_Cases

gcc/ada/

* contracts.adb (Analyze_Entry_Or_Subprogram_Contract,
Analyze_Subprogram_Body_Stub_Contract): Fix missing references
to Subprogram_Variant where similar references to Contract_Cases
are present.
* sem_prag.adb (Analyze_Contract_Case, Analyze_Variant): Check
that aggregate parameter has no expressions.
(Analyze_Pragma): Replace Contract_Cases with Subprogram_Variant
in a copy-pasted comment.

[Ada] GNAT.Sockets: fix comment typo

gcc/ada/

* libgnat/g-socket.ads: Fix comment typo.

[Ada] Implement new legality rules introduced in C.6(12) by AI12-0363

gcc/ada/

* doc/gnat_rm/implementation_defined_pragmas.rst (VFA): Remove uage
restrictions in conjunction with Atomic and Aliased.
* gnat_rm.texi: Regenerate.
* aspects.ads (Aspect_Id): Add Aspect_Full_Access_Only.
(Is_Representation_Aspect): Likewise.
(Aspect_Names): Likewise.
(Aspect_Delay): Likewise.
* einfo.ads (Is_Atomic_Or_VFA): Rename into...
(Is_Full_Access): ...this.
(Is_Volatile_Full_Access): Document new usage for Full_Access_Only.
* einfo.adb (Is_Atomic_Or_VFA): Rename into...
(Is_Full_Access): ...this.
* freeze.ads (Is_Atomic_VFA_Aggregate): Rename into...
(Is_Full_Access_Aggregate): ...this.
* freeze.adb (Is_Atomic_VFA_Aggregate): Rename into...
(Is_Full_Access_Aggregate): ...this.  Adjust to above renaming.
(Freeze_Array_Type): Likewise.
(Freeze_Entity): Likewise.
* exp_aggr.adb (Aggr_Assignment_OK_For_Backend): Likewise.
(Expand_Record_Aggregate): Likewise.
* exp_ch4.adb (Expand_N_Op_Eq): Likewise.
* exp_ch5.adb (Expand_Assign_Array): Likewise.
* exp_ch8.adb (Evaluation_Required): Likewise.
* layout.adb (Layout_Type): Likewise.
(Set_Composite_Alignment): Likewise.
* sem_aux.ads (Has_Rep_Item): Delete.
* sem_aux.adb (Has_Rep_Item): Likewise.
* sem_attr.adb (Resolve_Attribute) <Attribute_Access>: Implement
new legality rules in C.6(12).
* sem_ch12.adb (Instantiate_Object): Likewise.
* sem_res.adb (Resolve_Actuals): Likewise.
* sem_ch13.adb (Inherit_Delayed_Rep_Aspects): Deal with aspect
Full_Access_Only.
(Check_False_Aspect_For_Derived_Type): Likewise.
(Make_Pragma_From_Boolean_Aspect): Test for the presence of Expr.
Deal with aspect Full_Access_Only.
(Analyze_Aspects_At_Freeze_Point): Likewise.
(Analyze_One_Aspect): Do not set Delay_Required to true even for
Always_Delay boolean aspects if they have no expression.  Force
Delay_Required to true for aspect Full_Access_Only in all cases.
Reject aspect Full_Access_Only if not in Ada 2020 mode.
(Check_Aspect_At_End_Of_Declarations): Deal with empty expression.
(Check_Aspect_At_Freeze_Point): Likewise.
(Rep_Item_Entity): Delete.
(Inherit_Aspects_At_Freeze_Point): Align handling for Bit_Order
with that for Scalar_Storage_Order.
* sem_prag.adb (Check_Atomic_VFA): Delete.
(Check_VFA_Conflicts): Likewise.
(Check_Full_Access_Only): New procedure.
(Process_Atomic_Independent_Shared_Volatile): Call to implement
the new legality checks in C.6(8/2) and mark the entity last.
(Analyze_Pragma) <Pragma_Atomic_Components>: Remove obsolete check.
* sem_util.ads (Is_Atomic_Or_VFA_Object): Rename into...
(Is_Full_Access_Object): ...this.
(Is_Subcomponent_Of_Atomic_Object): Rename into...
(Is_Subcomponent_Of_Full_Access_Object): ...this.
* sem_util.adb (Inherit_Rep_Item_Chain): Use Present_In_Rep_Item.
(Is_Atomic_Or_VFA_Object): Rename into...
(Is_Full_Access_Object): ...this.
(Is_Subcomponent_Of_Atomic_Object): Rename into...
(Is_Subcomponent_Of_Full_Access_Object): ...this and adjust.
* snames.ads-tmpl (Name_Full_Access_Only): New name of aspect.
* gcc-interface/decl.c (gnat_to_gnu_entity): Adjust for renaming.
(promote_object_alignment): Likewise.
(gnat_to_gnu_field): Likewise.  Rename local variable and use
specific qualifier in error message for Volatile_Full_Access.
* gcc-interface/trans.c (lvalue_required_p): Likewise.

[Ada] Clean up in writing of ALI files

gcc/ada/

* lib-writ.ads, lib-writ.adb (Write_ALI): No longer read
existing ALI files in -gnatc mode.

[Ada] Fix logic in C_Select under mingw

gcc/ada/

* libgnat/g-socthi__mingw.adb (C_Select): Fix logic in code and
make it explicit that we are checking against null values before
dereferencing them.