[documentation] No need anymore to "mention ['gt-*.h' file] as a dependency in the 'Makefile'"

... as of r202907 (Git commit b6541edc52ed57b6e47150396356d3080ba81034)
"remove explicit dependencies".

gcc/
* doc/gty.texi (Files): Update.

[documentation] Fix GTY header file example

Fix-up for CVS 'gcc/doc/gty.texi' r1.6 (Subversion r55857, Git
commit cba57c9d40057fa78efc9a404ab4ae7101a59dcb) "Minor doc updates"

gcc/
* doc/gty.texi (Files): Fix GTY header file example.

Improve handling of unknown sign bit in CCP.

This middle-end patch implements several related improvements to
tree-ssa's conditional (bit) constant propagation pass.  The current
code handling ordered comparisons contains the comment "If the
most significant bits are not known we know nothing" which is not
entirely true [this test even prevents this pass understanding these
comparisons always have a zero or one result].  This patch introduces
a new value_mask_to_min_max helper function, that understands the
different semantics of the most significant bit on signed vs.
unsigned values.  This allows us to generalize ordered comparisons,
GE_EXPR, GT_EXPR, LE_EXPR and LT_EXPR, where to code is tweaked to
correctly handle the potential equal cases.  Then finally support
is added for the related tree codes MIN_EXPR, MAX_EXPR, ABS_EXPR
and ABSU_EXPR.

Regression testing revealed three test cases in the testsuite that
were checking for specific optimizations that are now being performed
earlier than expected.  These tests can continue to check their
original transformations by explicitly adding -fno-tree-ccp to their
dg-options (some already specify -fno-ipa-vrp or -fno-tree-forwprop
for the same reason).

2021-08-09  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
* tree-ssa-ccp.c (value_mask_to_min_max): Helper function to
determine the upper and lower bounds from a mask-value pair.
(bit_value_unop) [ABS_EXPR, ABSU_EXPR]: Add support for
absolute value and unsigned absolute value expressions.
(bit_value_binop):  Initialize *VAL's precision.
[LT_EXPR, LE_EXPR]: Use value_mask_to_min_max to determine
upper and lower bounds of operands.  Add LE_EXPR/GE_EXPR
support when the operands are unknown but potentially equal.
[MIN_EXPR, MAX_EXPR]: Support minimum/maximum expressions.

gcc/testsuite/ChangeLog
* gcc.dg/pr68217.c: Add -fno-tree-ccp option.
* gcc.dg/tree-ssa/vrp24.c: Add -fno-tree-ccp option.
* g++.dg/ipa/pure-const-3.C: Add -fno-tree-ccp option.

libstdc++: Make allocator equality comparable in tests

libstdc++-v3/ChangeLog:

* testsuite/23_containers/unordered_map/cons/default.cc: Add
equality comparison operators to allocator.
* testsuite/23_containers/unordered_set/cons/default.cc:
Likewise.

testsuite/lib/gfortran.exp: Add -I for ISO*.h [PR101305, PR101660]

This patch adds -I$specdir/libgfortran to GFORTRAN_UNDER_TEST, when
set by proc gfortran_init. As the $specdir depends on the multilib
setting, it has to be re-set for a different multilib; hence, we track
whether a previous call to gfortran_init set that var or whether it
was set differently.

gcc/testsuite/
PR libfortran/101305
PR fortran/101660

* lib/gfortran.exp (gfortran_init): Add -I $specdir/libgfortran to
GFORTRAN_UNDER_TEST; update it when set by previous gfortran_init call.
* gfortran.dg/ISO_Fortran_binding_1.c: Use <...> not "..." for
ISO_Fortran_binding.h's #include.
* gfortran.dg/ISO_Fortran_binding_10.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_11.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_12.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_15.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_16.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_17.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_18.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_3.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_5.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_6.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_7.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_8.c: Likewise.
* gfortran.dg/ISO_Fortran_binding_9.c: Likewise.
* gfortran.dg/PR94327.c: Likewise.
* gfortran.dg/PR94331.c: Likewise.
* gfortran.dg/bind_c_array_params_3_aux.c: Likewise.
* gfortran.dg/iso_fortran_binding_uint8_array_driver.c: Likewise.
* gfortran.dg/pr93524.c: Likewise.

aarch64: Expand %<w> correctly according to mode iterator

Pattern "*extend<SHORT:mode><GPI:mode>2_aarch64" is duplicated
from the corresponding zero_extend pattern, however %<w> needs
to be expanded according to its mode iterator because the smov
instruction is different to umov.

2021-08-09  Bin Cheng  <bin.cheng@linux.alibaba.com>

gcc/
* config/aarch64/aarch64.md
(*extend<SHORT:mode><GPI:mode>2_aarch64): Use %<GPI:w>0.

testsuite: aarch64: Fix invalid SVE tests

Some scan-assembler tests for SVE code generation were erroneously
split over multiple lines - meaning they became invalid. This patch
gets the tests working again by putting each test on a single line.

The extract_[1234].c tests are corrected to expect that extracted
32-bit values are moved into 'w' registers rather than 'x' registers.

gcc/testsuite/ChangeLog:

2021-08-06  Jonathan Wright  <jonathan.wright@arm.com>

* gcc.target/aarch64/sve/dup_lane_1.c: Don't split
scan-assembler tests over multiple lines. Expect 32-bit
result values in 'w' registers.
* gcc.target/aarch64/sve/extract_1.c: Likewise.
* gcc.target/aarch64/sve/extract_2.c: Likewise.
* gcc.target/aarch64/sve/extract_3.c: Likewise.
* gcc.target/aarch64/sve/extract_4.c: Likewise.

testsuite: aarch64: Fix failing vector structure tests on big-endian

Recent refactoring of the arm_neon.h header enabled better code
generation for intrinsics that manipulate vector structures. New
tests were also added to verify the benefit of these changes. It now
transpires that the code generation improvements are observed only on
little-endian systems. This patch restricts the code generation tests
to little-endian targets.

gcc/testsuite/ChangeLog:

2021-08-04  Jonathan Wright  <jonathan.wright@arm.com>

* gcc.target/aarch64/vector_structure_intrinsics.c: Restrict
tests to little-endian targets.

MAINTAINERS: Add myself for write after approval

ChangeLog:

* MAINTAINERS (Write After Approval): Add myself.

Daily bump.

lra: Fix s/otput/output/ typo in debug output

gcc/
* lra-constraints.c: Fix s/otput/output/ typo.

libstdc++: Fix dg-prune-output assertion message

Since __glibcxx_assert changes in r6b42b5a the generated assertion message
has changed.

libstdc++-v3/ChangeLog:

* testsuite/25_algorithms/copy/debug/constexpr_neg.cc: Replace 'failed_assertion'
dg-prune-output reason with 'builtin_unreachable'.
* testsuite/25_algorithms/copy_backward/debug/constexpr_neg.cc: Likewise.
* testsuite/25_algorithms/equal/debug/constexpr_neg.cc: Likewise.
* testsuite/25_algorithms/lower_bound/debug/constexpr_partitioned_neg.cc: Likewise.
* testsuite/25_algorithms/lower_bound/debug/constexpr_partitioned_pred_neg.cc: Likewise.
* testsuite/25_algorithms/lower_bound/debug/constexpr_valid_range_neg.cc: Likewise.
* testsuite/25_algorithms/upper_bound/debug/constexpr_partitioned_neg.cc: Likewise.
* testsuite/25_algorithms/upper_bound/debug/constexpr_partitioned_pred_neg.cc: Likewise.
* testsuite/25_algorithms/upper_bound/debug/constexpr_valid_range_neg.cc: Likewise.

Fix c6x test compromised by recent improvements to bswap & rotates

gcc/testsuite
* gcc.target/tic6x/rotdi16-scan.c: Pull rotate into its own function.

libstdc++: Tweak timeout for testsuite/std/ranges/iota/max_size_type.cc

A simulator can easily spend more than 10 minutes running
this test-case, and the default timeout is at 5 minutes.
Better allow even slower machines; use 4 as the factor.

Regarding relative runtime numbers (very local; mmixware simulator for
mmix-knuth-mmixware): test01 and test05 finish momentarily; test02 at
about 2 minutes, and test03 about 2m30, but test04 itself runs for
more than 6 minues and so times out.

Not sure if it's better to split up this test, as the excessive
runtime may be unintended, but this seemed simplest.

libstdc++-v3:
* testsuite/std/ranges/iota/max_size_type.cc: Set
dg-timeout-factor to 4.

Daily bump.

compiler: support export/import of unsafe.Add/Slice

For golang/go#19367
For golang/go#40481

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/340549

Fortran: ICE with automatic character object, save, and various options

gcc/fortran/ChangeLog:

PR fortran/68568
* primary.c (gfc_expr_attr): Variable attribute can only be
inquired when symtree is non-NULL.

Add tests for PR tree-optimization/88531

PR tree-optimization/88531
* gcc.target/i386/pr88531-1a.c: New test.
* gcc.target/i386/pr88531-1b.c: Likewise.
* gcc.target/i386/pr88531-1c.c: Likewise.
* gcc.target/i386/pr88531-2a.c: Likewise.
* gcc.target/i386/pr88531-2b.c: Likewise.
* gcc.target/i386/pr88531-2c.c: Likewise.

Daily bump.

Move more code to new gimple-ssa-warn-access pass.

gcc/ChangeLog:

* builtins.c (expand_builtin_memchr): Move to gimple-ssa-warn-access.cc.
(expand_builtin_strcat): Same.
(expand_builtin_stpncpy): Same.
(expand_builtin_strncat): Same.
(check_read_access): Same.
(check_memop_access): Same.
(expand_builtin_strlen): Move checks to gimple-ssa-warn-access.cc.
(expand_builtin_strnlen): Same.
(expand_builtin_memcpy): Same.
(expand_builtin_memmove): Same.
(expand_builtin_mempcpy): Same.
(expand_builtin_strcpy): Same.
(expand_builtin_strcpy_args): Same.
(expand_builtin_stpcpy_1): Same.
(expand_builtin_strncpy): Same.
(expand_builtin_memset): Same.
(expand_builtin_bzero): Same.
(expand_builtin_strcmp): Same.
(expand_builtin_strncmp): Same.
(expand_builtin): Remove handlers.
(fold_builtin_strlen): Add a comment.
* builtins.h (check_access): Move to gimple-ssa-warn-access.cc.
* calls.c (maybe_warn_nonstring_arg): Same.
* diagnostic-spec.c (nowarn_spec_t::nowarn_spec_t): Add warning option.
* gimple-fold.c (gimple_fold_builtin_strcpy): Pass argument to callee.
(gimple_fold_builtin_stpcpy): Same.
* gimple-ssa-warn-access.cc (has_location): New function.
(get_location): Same.
(get_callee_fndecl): Same.
(call_nargs): Same.
(call_arg): Same.
(warn_string_no_nul): Define.
(unterminated_array): Same.
(check_nul_terminated_array): Same.
(maybe_warn_nonstring_arg): Same.
(maybe_warn_for_bound): Same.
(warn_for_access): Same.
(check_access): Same.
(check_memop_access): Same.
(check_read_access): Same.
(warn_dealloc_offset): Use helper functions.
(maybe_emit_free_warning): Same.
(class pass_waccess): Add members.
(check_strcat): New function.
(check_strncat): New function.
(check_stxcpy): New function.
(check_stxncpy): New function.
(check_strncmp): New function.
(pass_waccess::check_builtin): New function.
(pass_waccess::check): Call it.
* gimple-ssa-warn-access.h (warn_string_no_nul): Move here from
builtins.h.
(maybe_warn_for_bound): Same.
(check_access): Same.
(check_memop_access): Same.
(check_read_access): Same.
* pointer-query.h (struct access_data): Define a ctor overload.

gcc/testsuite/ChangeLog:

* c-c++-common/Wsizeof-pointer-memaccess1.c: Also disable
-Wstringop-overread.
* c-c++-common/attr-nonstring-3.c: Adjust pattern of expected message.
* gcc.dg/Warray-bounds-39.c: Add an xfail due to a known bug.
* gcc.dg/Wstring-compare-3.c: Also disable -Wstringop-overread.
* gcc.dg/attr-nonstring-2.c: Adjust pattern of expected message.
* gcc.dg/attr-nonstring-4.c: Same.
* gcc.dg/Wstringop-overread-6.c: New test.
* gcc.dg/sso-14.c: Fix typos to avoid buffer overflow.

compiler: make escape analysis more strict about runtime calls

Following the previous CL, in the escape analysis list all the
expected runtime calls, and fail if an unexpected one is seen.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/340397

arm: Fix pr69245.c testcase for reorder assembler architecture directives [PR101723]

In gcc.target/arm/pr69245.c, to have a .fpu neon-vfpv4 directive, make
sure code for fn1() is emitted, by removing the static keyword.

Fix a typo in gcc.target/arm/pr69245.c, where \s should be \\s.

2021-08-06  Christophe Lyon  <christophe.lyon@foss.st.com>

gcc/testsuite/

PR target/101723
* gcc.target/arm/pr69245.c: Make sure to emit code for fn1, fix
typo.

arm: Fix typos for reorder assembler architecture directives [PR101723]

Two tests had typos preventing them from passing, committed as obvious.

2021-08-06  Christophe Lyon  <christophe.lyon@foss.st.com>

gcc/testsuite/
PR target/101723
* gcc.target/arm/attr-neon3.c: Fix typo.
* gcc.target/arm/pragma_fpu_attribute_2.c: Fix typo.

tree-optimization/101801 - remove vect_worthwhile_without_simd_p

This removes the cost part of vect_worthwhile_without_simd_p, retaining
only the correctness bits.  The reason is that the cost heuristic
do not properly account for SLP plus the check whether "without simd"
applies misfires for AVX512 mask vectors at the moment, leading to
missed vectorizations there.

Any costing decision should take place in the cost modeling, no
single stmt is to disable all vectorization on its own.

2021-08-06  Richard Biener  <rguenther@suse.de>

PR tree-optimization/101801
* tree-vectorizer.h (vect_worthwhile_without_simd_p): Rename...
(vect_can_vectorize_without_simd_p): ... to this.
* tree-vect-loop.c (vect_worthwhile_without_simd_p): Rename...
(vect_can_vectorize_without_simd_p): ... to this and fold
in vect_min_worthwhile_factor.
(vect_min_worthwhile_factor): Remove.
(vectorizable_reduction): Adjust and remove the cost part.
* tree-vect-stmts.c (vectorizable_shift): Likewise.
(vectorizable_operation): Likewise.

libstdc++: Also move the [[nodiscard]] attributes in <compare>

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:

* libsupc++/compare (compare_three_way, strong_order)
(weak_order, partial_order, compare_strong_order_fallback)
(compare_weak_order_fallback, compare_partial_order_fallback):
Move nodiscard attributes to correct location.

i386: Fix conditional move reg-to-reg move elimination peepholes [PR101797]

Add missing operand predicate, otherwise any RTX will match.

2021-08-06  Uroš Bizjak  <ubizjak@gmail.com>

gcc/
PR target/101797
* config/i386/i386.md (cmove reg-to-reg move elimination peephole2s):
Add general_gr_operand predicate to operand 3.

gcc/testsuite/
PR target/101797
* gcc.target/i386/pr101797.c: New test.

Use CFN_BUILT_IN_CLRSB instead of BUILT_IN_CLRSB in switch.

This patch replaces the use of BUILT_IN_CLRSB with CFN_BUILT_IN_CLRSB
in my recent patch to tree-ssa-phiopt.c.  Both of these have identical
values, so there's no change in behavior, but consistent use of the same
enumeration avoids warnings when using clang (or static analysis tools).

2021-08-06  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
* tree-ssa-phiopt.c (cond_removal_in_builtin_zero_pattern): Use
CFN_BUILT_IN_CLRSB* instead of BUILT_IN_CLRSB* for consistency.

middle-end/AArch64: Fix bootstrap after vec changes

The build is broken since a3d3e8c362c2 since it's deleted the ability to pass
vec<> by value and now must be past by reference.

However some language hooks used by AArch64 were not updated and breaks the
build on AArch64.  This patch updates these hooks.

gcc/c/ChangeLog:

* c-decl.c (c_simulate_enum_decl): Pass vec<> by pointer.
* c-tree.h (c_simulate_enum_decl): Likewise.

gcc/ChangeLog:

* config/aarch64/aarch64-sve-builtins.cc (register_svpattern,
register_svprfop): Pass vec<> by pointer.
* langhooks-def.h (lhd_simulate_enum_decl): Likewise.
* langhooks.c (lhd_simulate_enum_decl): Likewise.
* langhooks.h (struct lang_hooks_for_types): Likewise.

gcc/cp/ChangeLog:

* cp-objcp-common.h (cxx_simulate_enum_decl): Pass vec<> by pointer.
* decl.c (cxx_simulate_enum_decl): Likewise.

gcov: Remove <stdint.h> from libgcov-driver.c

In the patch to add __gcov_info_to_gcda(), the include of <stdint.h> was added
to libgcov-driver.c even if inhibit_libc is defined.  It turned out that this
header file is not always available.  Remove the include of <stdint.h> and
replace the intptr_t with the compiler provided __INTPTR_TYPE__.

libgcc/

* libgcov-driver.c (#include <stdint.h>): Remove.
(write_topn_counters): Use __INTPTR_TYPE__ instead of intptr_t.

aarch64: Use memcpy to copy structures in bfloat vst* intrinsics

Use __builtin_memcpy to copy vector structures instead of using a
union - or constructing a new opaque structure one vector at a time -
in each of the vst[234][q] and vst1[q]_x[234] bfloat Neon intrinsics
in arm_neon.h.

Add new code generation tests to verify that superfluous move
instructions are not generated for the vst[234]q or vst1q_x[234]
bfloat intrinsics.

gcc/ChangeLog:

2021-07-30  Jonathan Wright  <jonathan.wright@arm.com>

* config/aarch64/arm_neon.h (vst1_bf16_x2): Use
__builtin_memcpy instead of constructing an additional
__builtin_aarch64_simd_oi one vector at a time.
(vst1q_bf16_x2): Likewise.
(vst1_bf16_x3): Use __builtin_memcpy instead of constructing
an additional __builtin_aarch64_simd_ci one vector at a time.
(vst1q_bf16_x3): Likewise.
(vst1_bf16_x4): Use __builtin_memcpy instead of a union.
(vst1q_bf16_x4): Likewise.
(vst2_bf16): Use __builtin_memcpy instead of constructing an
additional __builtin_aarch64_simd_oi one vector at a time.
(vst2q_bf16): Likewise.
(vst3_bf16): Use __builtin_memcpy instead of constructing an
additional __builtin_aarch64_simd_ci mode one vector at a
time.
(vst3q_bf16): Likewise.
(vst4_bf16): Use __builtin_memcpy instead of constructing an
additional __builtin_aarch64_simd_xi one vector at a time.
(vst4q_bf16): Likewise.

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/vector_structure_intrinsics.c: Add new
tests.

aarch64: Use memcpy to copy structures in vst2[q]_lane intrinsics

Use __builtin_memcpy to copy vector structures instead of using a
union - or constructing a new opaque structure one vector at a time -
in each of the vst2[q]_lane Neon intrinsics in arm_neon.h.

Add new code generation tests to verify that superfluous move
instructions are not generated for the vst2q_lane intrinsics.

gcc/ChangeLog:

2021-07-30  Jonathan Wright  <jonathan.wright@arm.com>

* config/aarch64/arm_neon.h (__ST2_LANE_FUNC): Delete.
(__ST2Q_LANE_FUNC): Delete.
(vst2_lane_f16): Use __builtin_memcpy to copy vector
structure instead of constructing __builtin_aarch64_simd_oi
one vector at a time.
(vst2_lane_f32): Likewise.
(vst2_lane_f64): Likewise.
(vst2_lane_p8): Likewise.
(vst2_lane_p16): Likewise.
(vst2_lane_p64): Likewise.
(vst2_lane_s8): Likewise.
(vst2_lane_s16): Likewise.
(vst2_lane_s32): Likewise.
(vst2_lane_s64): Likewise.
(vst2_lane_u8): Likewise.
(vst2_lane_u16): Likewise.
(vst2_lane_u32): Likewise.
(vst2_lane_u64): Likewise.
(vst2_lane_bf16): Likewise.
(vst2q_lane_f16): Use __builtin_memcpy to copy vector
structure instead of using a union.
(vst2q_lane_f32): Likewise.
(vst2q_lane_f64): Likewise.
(vst2q_lane_p8): Likewise.
(vst2q_lane_p16): Likewise.
(vst2q_lane_p64): Likewise.
(vst2q_lane_s8): Likewise.
(vst2q_lane_s16): Likewise.
(vst2q_lane_s32): Likewise.
(vst2q_lane_s64): Likewise.
(vst2q_lane_u8): Likewise.
(vst2q_lane_u16): Likewise.
(vst2q_lane_u32): Likewise.
(vst2q_lane_u64): Likewise.
(vst2q_lane_bf16): Likewise.

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/vector_structure_intrinsics.c: Add new
tests.

aarch64: Use memcpy to copy structures in vst3[q]_lane intrinsics

Use __builtin_memcpy to copy vector structures instead of using a
union - or constructing a new opaque structure one vector at a time -
in each of the vst3[q]_lane Neon intrinsics in arm_neon.h.

Add new code generation tests to verify that superfluous move
instructions are not generated for the vst3q_lane intrinsics.

gcc/ChangeLog:

2021-07-30  Jonathan Wright  <jonathan.wright@arm.com>

* config/aarch64/arm_neon.h (__ST3_LANE_FUNC): Delete.
(__ST3Q_LANE_FUNC): Delete.
(vst3_lane_f16): Use __builtin_memcpy to copy vector
structure instead of constructing __builtin_aarch64_simd_ci
one vector at a time.
(vst3_lane_f32): Likewise.
(vst3_lane_f64): Likewise.
(vst3_lane_p8): Likewise.
(vst3_lane_p16): Likewise.
(vst3_lane_p64): Likewise.
(vst3_lane_s8): Likewise.
(vst3_lane_s16): Likewise.
(vst3_lane_s32): Likewise.
(vst3_lane_s64): Likewise.
(vst3_lane_u8): Likewise.
(vst3_lane_u16): Likewise.
(vst3_lane_u32): Likewise.
(vst3_lane_u64): Likewise.
(vst3_lane_bf16): Likewise.
(vst3q_lane_f16): Use __builtin_memcpy to copy vector
structure instead of using a union.
(vst3q_lane_f32): Likewise.
(vst3q_lane_f64): Likewise.
(vst3q_lane_p8): Likewise.
(vst3q_lane_p16): Likewise.
(vst3q_lane_p64): Likewise.
(vst3q_lane_s8): Likewise.
(vst3q_lane_s16): Likewise.
(vst3q_lane_s32): Likewise.
(vst3q_lane_s64): Likewise.
(vst3q_lane_u8): Likewise.
(vst3q_lane_u16): Likewise.
(vst3q_lane_u32): Likewise.
(vst3q_lane_u64): Likewise.
(vst3q_lane_bf16): Likewise.

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/vector_structure_intrinsics.c: Add new
tests.

aarch64: Use memcpy to copy structures in vst4[q]_lane intrinsics

Use __builtin_memcpy to copy vector structures instead of using a
union - or constructing a new opaque structure one vector at a time -
in each of the vst4[q]_lane Neon intrinsics in arm_neon.h.

Add new code generation tests to verify that superfluous move
instructions are not generated for the vst4q_lane intrinsics.

gcc/ChangeLog:

2021-07-29  Jonathan Wright  <jonathan.wright@arm.com>

* config/aarch64/arm_neon.h (__ST4_LANE_FUNC): Delete.
(__ST4Q_LANE_FUNC): Delete.
(vst4_lane_f16): Use __builtin_memcpy to copy vector
structure instead of constructing __builtin_aarch64_simd_xi
one vector at a time.
(vst4_lane_f32): Likewise.
(vst4_lane_f64): Likewise.
(vst4_lane_p8): Likewise.
(vst4_lane_p16): Likewise.
(vst4_lane_p64): Likewise.
(vst4_lane_s8): Likewise.
(vst4_lane_s16): Likewise.
(vst4_lane_s32): Likewise.
(vst4_lane_s64): Likewise.
(vst4_lane_u8): Likewise.
(vst4_lane_u16): Likewise.
(vst4_lane_u32): Likewise.
(vst4_lane_u64): Likewise.
(vst4_lane_bf16): Likewise.
(vst4q_lane_f16): Use __builtin_memcpy to copy vector
structure instead of using a union.
(vst4q_lane_f32): Likewise.
(vst4q_lane_f64): Likewise.
(vst4q_lane_p8): Likewise.
(vst4q_lane_p16): Likewise.
(vst4q_lane_p64): Likewise.
(vst4q_lane_s8): Likewise.
(vst4q_lane_s16): Likewise.
(vst4q_lane_s32): Likewise.
(vst4q_lane_s64): Likewise.
(vst4q_lane_u8): Likewise.
(vst4q_lane_u16): Likewise.
(vst4q_lane_u32): Likewise.
(vst4q_lane_u64): Likewise.
(vst4q_lane_bf16): Likewise.

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/vector_structure_intrinsics.c: Add new
tests.

rs6000: Fix restored rs6000_long_double_type_size

As mentioned in the "Fallout: save/restore target options in handle_optimize_attribute"
thread, we need to support target option restore
of rs6000_long_double_type_size == FLOAT_PRECISION_TFmode.

gcc/ChangeLog:

* config/rs6000/rs6000.c (rs6000_option_override_internal): When
a target option is restored, it can have
rs6000_long_double_type_size set to FLOAT_PRECISION_TFmode
and error should not be emitted.

gcc/testsuite/ChangeLog:

* gcc.target/powerpc/pragma-optimize.c: New test.

Fixup gfortran.dg/vect/vect-8.f90 for aarch64

With the emulated gather changes we now consistently vectorize
for aarch64 and we can remove the SVE special-casing.

2021-08-06  Richard Biener  <rguenther@suse.de>

* gfortran.dg/vect/vect-8.f90: Simplify aarch64 scanning.

gcov: Add __gcov_info_to_gdca()

Add __gcov_info_to_gcda() to libgcov to get the gcda data for a gcda info in a
freestanding environment.  It is intended to be used with the
-fprofile-info-section option.  A crude test program which doesn't use a linker
script is (use "gcc -coverage -fprofile-info-section -lgcov test.c" to compile
it):

  #include <gcov.h>
  #include <stdio.h>
  #include <stdlib.h>

  extern const struct gcov_info *my_info;

  static void
  filename (const char *f, void *arg)
  {
    printf("filename: %s\n", f);
  }

  static void
  dump (const void *d, unsigned n, void *arg)
  {
    const unsigned char *c = d;

    for (unsigned i = 0; i < n; ++i)
      printf ("%02x", c[i]);
  }

  static void *
  allocate (unsigned length, void *arg)
  {
    return malloc (length);
  }

  int main()
  {
    __asm__ volatile (".set my_info, .LPBX2");
    __gcov_info_to_gcda (my_info, filename, dump, allocate, NULL);
    return 0;
  }

With this patch, <stdint.h> is included in libgcov-driver.c even if
inhibit_libc is defined.  This header file should be also available for
freestanding environments.  If this is not the case, then we have to define
intptr_t somehow.

The patch removes one use of memset() which makes the <string.h> include
superfluous.

gcc/

* gcov-io.h (gcov_write): Declare.
* gcov-io.c (gcov_write): New.
(gcov_write_counter): Remove.
(gcov_write_tag_length): Likewise.
(gcov_write_summary): Replace gcov_write_tag_length() with calls to
gcov_write_unsigned().
* doc/invoke.texi (fprofile-info-section): Mention
__gcov_info_to_gdca().

gcc/testsuite/

* gcc.dg/gcov-info-to-gcda.c: New test.

libgcc/

* Makefile.in (LIBGCOV_DRIVER): Add _gcov_info_to_gcda.
* gcov.h (gcov_info): Declare.
(__gcov_info_to_gdca): Likewise.
* libgcov.h (gcov_write_counter): Remove.
(gcov_write_tag_length): Likewise.
* libgcov-driver.c (#include <stdint.h>): New.
(#include <string.h>): Remove.
(NEED_L_GCOV): Conditionally define.
(NEED_L_GCOV_INFO_TO_GCDA): Likewise.
(are_all_counters_zero): New.
(gcov_dump_handler): Likewise.
(gcov_allocate_handler): Likewise.
(dump_unsigned): Likewise.
(dump_counter): Likewise.
(write_topn_counters): Add dump_fn, allocate_fn, and arg parameters.
Use dump_unsigned() and dump_counter().
(write_one_data): Add dump_fn, allocate_fn, and arg parameters.  Use
dump_unsigned(), dump_counter(), and are_all_counters_zero().
(__gcov_info_to_gcda): New.

Adjust by-value function vec arguments to by-reference.

gcc/c/ChangeLog:

* c-parser.c (c_parser_declaration_or_fndef): Adjust by-value function
vec arguments to by-reference.
(c_finish_omp_declare_simd): Same.
(c_parser_compound_statement_nostart): Same.
(c_parser_for_statement): Same.
(c_parser_objc_methodprotolist): Same.
(c_parser_oacc_routine): Same.
(c_parser_omp_for_loop): Same.
(c_parser_omp_declare_simd): Same.

gcc/ChangeLog:

* dominance.c (prune_bbs_to_update_dominators): Adjust by-value vec
arguments to by-reference.
(iterate_fix_dominators): Same.
* dominance.h (iterate_fix_dominators): Same.
* ipa-prop.h: Call auto_vec::to_vec_legacy.
* tree-data-ref.c (dump_data_dependence_relation): Adjust by-value vec
arguments to by-reference.
(debug_data_dependence_relation): Same.
(dump_data_dependence_relations): Same.
* tree-data-ref.h (debug_data_dependence_relation): Same.
(dump_data_dependence_relations): Same.
* tree-predcom.c (dump_chains): Same.
(initialize_root_vars_lm): Same.
(determine_unroll_factor): Same.
(replace_phis_by_defined_names): Same.
(insert_init_seqs): Same.
(pcom_worker::tree_predictive_commoning_loop): Call
 auto_vec::to_vec_legacy.
* tree-ssa-pre.c (insert_into_preds_of_block): Adjust by-value vec
arguments to by-reference.
* tree-ssa-threadbackward.c (populate_worklist): Same.
(back_threader::resolve_def): Same.
* tree-vect-data-refs.c (vect_check_nonzero_value): Same.
(vect_enhance_data_refs_alignment): Same.
(vect_check_lower_bound): Same.
(vect_prune_runtime_alias_test_list): Same.
(vect_permute_store_chain): Same.
* tree-vect-slp-patterns.c (vect_normalize_conj_loc): Same.
* tree-vect-stmts.c (vect_create_vectorized_demotion_stmts): Same.
* tree-vectorizer.h (vect_permute_store_chain): Same.
* vec.c (test_init): New function.
(vec_c_tests): Call new function.
* vec.h (vec): Declare ctors, dtor, and assignment.
(auto_vec::vec_to_legacy): New function.
(vec::copy): Adjust initialization.

Daily bump.

runtime: extend internal atomics to comply with sync/atomic

This is the gofrontend version of https://golang.org/cl/289152.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/339690

libstdc++: Move [[nodiscard]] attributes again [PR101782]

Where I moved these nodiscard attributes to made them apply to the
function type, not to the function. This meant they no longer generated
the desired -Wunused-result warnings, and were ill-formed with Clang
(but only a pedwarn with GCC).

Clang also detected ill-formed attributes in <queue> which this fixes.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:

PR libstdc++/101782
* include/bits/ranges_base.h (ranges::begin, ranges::end)
(ranges::rbegin, ranges::rend, ranges::size, ranges::ssize)
(ranges::empty, ranges::data): Move attribute after the
declarator-id instead of at the end of the declarator.
* include/bits/stl_iterator.h (__gnu_cxx::__normal_iterator):
Move attributes back to the start of the function declarator,
but move the requires-clause to the end.
(common_iterator): Move attribute after the declarator-id.
* include/bits/stl_queue.h (queue): Remove ill-formed attributes
from friend declaration that are not definitions.
* include/std/ranges (views::all, views::filter)
(views::transform, views::take, views::take_while,
views::drop) (views::drop_while, views::join,
views::lazy_split) (views::split, views::counted,
views::common, views::reverse) (views::elements): Move
attributes after the declarator-id.

libcpp: Regenerate ucnid.h using Unicode 13.0.0 files [PR100977]

The following patch (incremental to the makeucnid.c fix) regenerates
ucnid.h with https://www.unicode.org/Public/13.0.0/ucd/ files.

2021-08-05  Jakub Jelinek  <jakub@redhat.com>

PR c++/100977
* ucnid.h: Regenerated using Unicode 13.0.0 files.

libcpp: Fix makeucnid bug with combining values [PR100977]

I've noticed in ucnid.h two adjacent lines that had all flags and combine
values identical and as such were supposed to be merged.

This is due to a bug in makeucnid.c, which records last_flag,
last_combine and really_safe of what has just been printed, but
because of a typo mishandles it for last_combine, always compares against
the combining_value[0] which is 0.

This has two effects on the table, one is that often the table is
unnecessarily large, as for non-zero .combine every character has its own
record instead of adjacent characters with the same flags and combine
being merged.  This means larger tables.
The other is that sometimes the last char that has combine set doesn't
actually have it in the tables, because the code is printing entries only
upon seeing the next character and if that character does have
combining_value of 0 and flags are otherwise the same as previously printed,
it will not print anything.

The following patch fixes that, for clarity what exactly it affects
I've regenerated with the same Unicode files as last time it has
been regenerated.

2021-08-05  Jakub Jelinek  <jakub@redhat.com>

PR c++/100977
* makeucnid.c (write_table): Fix computation of last_combine.
* ucnid.h: Regenerated using Unicode 6.3.0 files.

libgcc: Honor LDFLAGS_FOR_TARGET when linking libgcc_s

When building gcc with some specific LDFLAGS_FOR_TARGET, e.g.
LDFLAGS_FOR_TARGET=-Wl,-z,relro,-z,now
those flags propagate info linking of target shared libraries,
e.g. lib{ubsan,tsan,stdc++,quadmath,objc,lsan,itm,gphobos,gdruntime,gomp,go,gfortran,atomic,asan}.so.*
but there is one important exception, libgcc_s.so.* linking ignores it.

The following patch fixes that.

Bootstrapped/regtested on x86_64-linux with LDFLAGS_FOR_TARGET=-Wl,-z,relro,-z,now
and verified that libgcc_s.so.* is BIND_NOW when it previously wasn't, and
without any LDFLAGS_FOR_TARGET on x86_64-linux and i686-linux.
There on x86_64-linux I've verified that the libgcc_s.so.1 linking command
line for -m64 is identical except for whitespace to one without the patch,
and for -m32 multilib $(LDFLAGS) actually do supply there an extra -m32
that also repeats later in the @multilib_flags@, which should be harmless.

2021-08-04  Jakub Jelinek  <jakub@redhat.com>

* config/t-slibgcc (SHLIB_LINK): Add $(LDFLAGS).
* config/t-slibgcc-darwin (SHLIB_LINK): Likewise.
* config/t-slibgcc-vms (SHLIB_LINK): Likewise.
* config/t-slibgcc-fuchsia (SHLIB_LDFLAGS): Remove $(LDFLAGS).

openmp: Implement omp_get_device_num routine

This patch implements the omp_get_device_num library routine, specified in
OpenMP 5.0.

GOMP_DEVICE_NUM_VAR is a macro symbol which defines name of a "device number"
variable, is defined on the device-side libgomp, has it's address returned to
host-side libgomp during device initialization, and the host libgomp then
sets its value to the designated device number.

libgomp/ChangeLog:

* icv-device.c (omp_get_device_num): New API function, host side.
* fortran.c (omp_get_device_num_): New interface function.
* libgomp-plugin.h (GOMP_DEVICE_NUM_VAR): Define macro symbol.
* libgomp.map (OMP_5.0.2): New version space with omp_get_device_num,
omp_get_device_num_.
* libgomp.texi (omp_get_device_num): Add documentation for new API
function.
* omp.h.in (omp_get_device_num): Add declaration.
* omp_lib.f90.in (omp_get_device_num): Likewise.
* omp_lib.h.in (omp_get_device_num): Likewise.
* target.c (gomp_load_image_to_device): If additional entry for device
number exists at end of returned entries from 'load_image_func' hook,
copy the assigned device number over to the device variable.

* config/gcn/icv-device.c (GOMP_DEVICE_NUM_VAR): Define static global.
(omp_get_device_num): New API function, device side.
* plugin/plugin-gcn.c ("symcat.h"): Add include.
(GOMP_OFFLOAD_load_image): Add addresses of device GOMP_DEVICE_NUM_VAR
at end of returned 'target_table' entries.

* config/nvptx/icv-device.c (GOMP_DEVICE_NUM_VAR): Define static global.
(omp_get_device_num): New API function, device side.
* plugin/plugin-nvptx.c ("symcat.h"): Add include.
(GOMP_OFFLOAD_load_image): Add addresses of device GOMP_DEVICE_NUM_VAR
at end of returned 'target_table' entries.

* testsuite/lib/libgomp.exp
(check_effective_target_offload_target_intelmic): New function for
testing for intelmic offloading.
* testsuite/libgomp.c-c++-common/target-45.c: New test.
* testsuite/libgomp.fortran/target10.f90: New test.

libstdc++: Add [[nodiscard]] to <compare>

This adds the [[nodiscard]] attribute to all conversion operators,
comparison operators, call operators and non-member functions in
<compare>. Nothing in this header except constructors has side effects.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:

* libsupc++/compare (partial_ordering, weak_ordering)
(strong_ordering, is_eq, is_neq, is_lt, is_lteq, is_gt, is_gteq)
(compare_three_way, strong_order, weak_order, partial_order)
(compare_strong_order_fallback, compare_weak_order_fallback)
(compare_partial_order_fallback, __detail::__synth3way): Add
nodiscard attribute.
* testsuite/18_support/comparisons/categories/zero_neg.cc: Add
-Wno-unused-result to options.

testsuite: Fix warning introduced by nodiscard in libstdc++

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
gcc/testsuite/ChangeLog:

* g++.old-deja/g++.other/inline7.C: Cast nodiscard call to void.

libstdc++: Move attributes that follow requires-clauses [PR101782]

As explained in the PR, the grammar in the Concepts TS means that a [
token following a requires-clause is parsed as part of the
logical-or-expression rather than the start of an attribute. That makes
the following ill-formed when using -fconcepts-ts:

  template<typename T> requires foo<T> [[nodiscard]] int f(T);

This change moves all attributes that follow a requires-clause to the
end of the function declarator.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:

PR libstdc++/101782
* include/bits/ranges_base.h (ranges::begin, ranges::end)
(ranges::rbegin, ranges::rend, ranges::size, ranges::ssize)
(ranges::empty, ranges::data): Move attribute to the end of
the declarator.
* include/bits/stl_iterator.h (__gnu_cxx::__normal_iterator)
(common_iterator): Likewise for non-member operator functions.
* include/std/ranges (views::all, views::filter)
(views::transform, views::take, views::take_while, views::drop)
(views::drop_while, views::join, views::lazy_split)
(views::split, views::counted, views::common, views::reverse)
(views::elements): Likewise.
* testsuite/std/ranges/access/101782.cc: New test.

<x86gprintrin.h>: Add pragma GCC target("general-regs-only")

1. Intrinsics in <x86gprintrin.h> only require GPR ISAs.  Add

 #if defined __MMX__ || defined __SSE__
 #pragma GCC push_options
 #pragma GCC target("general-regs-only")
 #define __DISABLE_GENERAL_REGS_ONLY__
 #endif

and

 #ifdef __DISABLE_GENERAL_REGS_ONLY__
 #undef __DISABLE_GENERAL_REGS_ONLY__
 #pragma GCC pop_options
 #endif /* __DISABLE_GENERAL_REGS_ONLY__ */

to <x86gprintrin.h> to disable non-GPR ISAs so that they can be used in
functions with __attribute__ ((target("general-regs-only"))).
2. When checking always_inline attribute, if callee only uses GPRs,
ignore MASK_80387 since enable MASK_80387 in caller has no impact on
callee inline.

gcc/

PR target/99744
* config/i386/i386.c (ix86_can_inline_p): Ignore MASK_80387 if
callee only uses GPRs.
* config/i386/ia32intrin.h: Revert commit 5463cee2770.
* config/i386/serializeintrin.h: Revert commit 71958f740f1.
* config/i386/x86gprintrin.h: Add
#pragma GCC target("general-regs-only") and #pragma GCC pop_options
to disable non-GPR ISAs.

gcc/testsuite/

PR target/99744
* gcc.target/i386/pr99744-3.c: New test.
* gcc.target/i386/pr99744-4.c: Likewise.
* gcc.target/i386/pr99744-5.c: Likewise.
* gcc.target/i386/pr99744-6.c: Likewise.
* gcc.target/i386/pr99744-7.c: Likewise.
* gcc.target/i386/pr99744-8.c: Likewise.

doc: Document cond_* shift optabs in md.texi

gcc/
PR middle-end/101787
* doc/md.texi (cond_ashl, cond_ashr, cond_lshr): Document.

vect: Move costing helpers from aarch64 code

aarch64.c has various routines to test for specific kinds of
vector statement cost.  The routines aren't really target-specific,
so following a suggestion from Richi, this patch moves them to a new
section of tree-vectorizer.h.

gcc/
* tree-vectorizer.h (vect_is_store_elt_extraction, vect_is_reduction)
(vect_reduc_type, vect_embedded_comparison_type, vect_comparison_type)
(vect_is_extending_load, vect_is_integer_truncation): New functions,
moved from aarch64.c but given different names.
* config/aarch64/aarch64.c (aarch64_is_store_elt_extraction)
(aarch64_is_reduction, aarch64_reduc_type)
(aarch64_embedded_comparison_type, aarch64_comparison_type)
(aarch64_extending_load_p, aarch64_integer_truncation_p): Delete
in favor of the above.  Update callers accordingly.

arm: reorder assembler architecture directives [PR101723]

A change to the way gas interprets the .fpu directive in binutils-2.34
means that issuing .fpu will clear any features set by .arch_extension
that apply to the floating point or simd units.  This unfortunately
causes problems for more recent versions of the architecture because
we currently emit .arch, .arch_extension and .fpu directives at
different times and try to suppress redundant changes.

This change addresses this by firstly unifying all the places where we
emit these directives to a single block of code and secondly
(re)emitting all the directives if any changes have been made to the
target options.  Whilst this is slightly more than the strict minimum
it should be enough to catch all cases where a change could have
happened.  The new code also emits the directives in the order: .arch,
.fpu, .arch_extension.  This ensures that the additional architectural
extensions are not removed by a later .fpu directive.

Whilst writing this patch I also noticed that in the corner case where
the last function to be compiled had a non-standard set of
architecture flags, the assembler would add an incorrect set of
derived attributes for the file as a whole.  Instead of reflecting the
command-line options it would reflect the flags from the last file in
the function.  To address this I've also added a call to re-emit the
flags from the asm_file_end callback so the assembler will be in the
correct state when it finishes processing the intput.

There's some slight churn to the testsuite as a consequence of this,
because previously we had a hack to suppress emitting a .fpu directive
for one specific case, but with the new order this is no-longer
necessary.

gcc/ChangeLog:

PR target/101723
* config/arm/arm-cpus.in (generic-armv7-a): Add quirk to suppress
writing .cpu directive in asm output.
* config/arm/arm.c (arm_identify_fpu_from_isa): New variable.
(arm_last_printed_arch_string): Delete.
(arm_last-printed_fpu_string): Delete.
(arm_configure_build_target): If use of floating-point/SIMD is
disabled, remove all fp/simd related features from the target ISA.
(last_arm_targ_options): New variable.
(arm_print_asm_arch_directives): Add new parameters.  Change order
of emitted directives and handle all cases here.
(arm_file_start): Always call arm_print_asm_arch_directives, move
all generation of .arch/.arch_extension here.
(arm_file_end): Call arm_print_asm_arch.
(arm_declare_function_name): Call arm_print_asm_arch_directives
instead of printing .arch/.fpu directives directly.

gcc/testsuite/ChangeLog:

PR target/101723
* gcc.target/arm/cortex-m55-nofp-flag-hard.c: Update expected output.
* gcc.target/arm/cortex-m55-nofp-flag-softfp.c: Likewise.
* gcc.target/arm/cortex-m55-nofp-nomve-flag-softfp.c: Likewise.
* gcc.target/arm/mve/intrinsics/mve_fpu1.c: Convert to dg-do assemble.
Add a non-no-op function body.
* gcc.target/arm/mve/intrinsics/mve_fpu2.c: Likewise.
* gcc.target/arm/pr98636.c (dg-options): Add -mfloat-abi=softfp.
* gcc.target/arm/attr-neon.c: Tighten scan-assembler tests.
* gcc.target/arm/attr-neon2.c: Use -Ofast, convert test to use
check-function-bodies.
* gcc.target/arm/attr-neon3.c: Likewise.
* gcc.target/arm/pr69245.c: Tighten scan-assembler match, but allow
multiple instances.
* gcc.target/arm/pragma_fpu_attribute.c: Likewise.
* gcc.target/arm/pragma_fpu_attribute_2.c: Likewise.

arm: Don't reconfigure globals in arm_configure_build_target

arm_configure_build_target is usually used to reconfigure the
arm_active_target structure, which is then used to reconfigure a
number of other global variables describing the current target.
Occasionally, however, we need to use arm_configure_build_target to
construct a temporary target structure and in that case it is wrong to
try to reconfigure the global variables (although probably harmless,
since arm_option_reconfigure_globals() only looks at
arm_active_target).  At the very least, however, this is wasted work,
so it is best not to do it unless needed.  What's more, several
callers of arm_configure_build target call
arm_option_reconfigure_globals themselves within a few lines, making
the call from within arm_configure_build_target completely redundant.

So this patch moves the responsibility of calling of
arm_configure_build_target to its callers (only two places needed
updating).

gcc:
* config/arm/arm.c (arm_configure_build_target): Don't call
arm_option_reconfigure_globals.
(arm_option_restore): Call arm_option_reconfigure_globals after
reconfiguring the target.
* config/arm/arm-c.c (arm_pragma_target_parse): Likewise.

arm: ensure the arch_name is always set for the build target

This should never happen now if GCC is invoked by the driver, but in
the unusual case of calling cc1 (or its ilk) directly from the command
line the build target's arch_name string can remain NULL.  This can
complicate later processing meaning that we need to check for this
case explicitly in some circumstances.  Nothing should rely on this
behaviour, so it's simpler to always set the arch_name when
configuring the build target and be done with it.

gcc:

* config/arm/arm.c (arm_configure_build_target): Ensure the target's
arch_name is always set.

aarch64: Don't include vec_select high-half in SIMD subtract cost

The Neon subtract-long/subract-widen instructions can select the top
or bottom half of the operand registers. This selection does not
change the cost of the underlying instruction and this should be
reflected by the RTL cost function.

This patch adds RTL tree traversal in the Neon subtract cost function
to match vec_select high-half of its operands. This traversal
prevents the cost of the vec_select from being added into the cost of
the subtract - meaning that these instructions can now be emitted in
the combine pass as they are no longer deemed prohibitively
expensive.

gcc/ChangeLog:

2021-07-28  Jonathan Wright  <jonathan.wright@arm.com>

* config/aarch64/aarch64.c: Traverse RTL tree to prevent cost
of vec_select high-half from being added into Neon subtract
cost.

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/vsubX_high_cost.c: New test.

aarch64: Don't include vec_select high-half in SIMD add cost

The Neon add-long/add-widen instructions can select the top or bottom
half of the operand registers. This selection does not change the
cost of the underlying instruction and this should be reflected by
the RTL cost function.

This patch adds RTL tree traversal in the Neon add cost function to
match vec_select high-half of its operands. This traversal prevents
the cost of the vec_select from being added into the cost of the
subtract - meaning that these instructions can now be emitted in the
combine pass as they are no longer deemed prohibitively expensive.

gcc/ChangeLog:

2021-07-28  Jonathan Wright  <jonathan.wright@arm.com>

* config/aarch64/aarch64.c: Traverse RTL tree to prevent cost
of vec_select high-half from being added into Neon add cost.

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/vaddX_high_cost.c: New test.

Adjust gcc.dg/vect/bb-slp-pr101756.c

This adjusts the testcase for excess diagnostics emitted by some
targets because of the attribute simd usage like

warning: GCC does not currently support mixed size types for 'simd' functions

on aarch64.

2021-08-05  Richard Biener  <rguenther@suse.de>

* gcc.dg/vect/bb-slp-pr101756.c: Add -w.

cfgloop: Make loops_list support an optional loop_p root

This patch follows Richi's suggestion to add one optional
argument class loop* root to loops_list's CTOR, it can
provide the ability to construct a visiting list starting
from the given class loop* ROOT rather than the default
tree_root of loops_for_fn (FN), for visiting a subset of
the loop tree.

It unifies all orders of walkings into walk_loop_tree, but
it still uses linear search for LI_ONLY_INNERMOST when
looking at the whole loop tree since it has a more stable
bound.

gcc/ChangeLog:

* cfgloop.h (loops_list::loops_list): Add one optional argument
root and adjust accordingly, update loop tree walking and factor
out to ...
* cfgloop.c (loops_list::walk_loop_tree): ... this.  New function.

Fix oversight in handling of reverse SSO in SRA pass

The scalar storage order does not apply to pointer and vector components.

gcc/
PR tree-optimization/101626
* tree-sra.c (propagate_subaccesses_from_rhs): Do not set the
reverse scalar storage order on a pointer or vector component.

gcc/testsuite/
* gcc.dg/sso-15.c: New test.

compiler: make escape analysis more robust about builtin functions

In the places where we handle builtin functions, list all
supported ones, and fail if an unexpected one is seen. So if a
new builtin function is added in the future we can detect it,
instead of silently treating it as nonescaping.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/339992

Support cond_{xor,ior,and} for vector integer mode under AVX512.

gcc/ChangeLog:

* config/i386/sse.md (cond_<code><mode>): New expander.

gcc/testsuite/ChangeLog:

* gcc.target/i386/cond_op_anylogic_d-1.c: New test.
* gcc.target/i386/cond_op_anylogic_d-2.c: New test.
* gcc.target/i386/cond_op_anylogic_q-1.c: New test.
* gcc.target/i386/cond_op_anylogic_q-2.c: New test.

Support cond_{smax,smin} for vector float/double modes under AVX512.

gcc/ChangeLog:

* config/i386/sse.md (cond_<code><mode>): New expander.

gcc/testsuite/ChangeLog:

* gcc.target/i386/cond_op_maxmin_double-1.c: New test.
* gcc.target/i386/cond_op_maxmin_double-2.c: New test.
* gcc.target/i386/cond_op_maxmin_float-1.c: New test.
* gcc.target/i386/cond_op_maxmin_float-2.c: New test.

Support cond_{smax,smin,umax,umin} for vector integer modes under AVX512.

gcc/ChangeLog:

* config/i386/sse.md (cond_<code><mode>): New expander.

gcc/testsuite/ChangeLog:

* gcc.target/i386/cond_op_maxmin_b-1.c: New test.
* gcc.target/i386/cond_op_maxmin_b-2.c: New test.
* gcc.target/i386/cond_op_maxmin_d-1.c: New test.
* gcc.target/i386/cond_op_maxmin_d-2.c: New test.
* gcc.target/i386/cond_op_maxmin_q-1.c: New test.
* gcc.target/i386/cond_op_maxmin_q-2.c: New test.
* gcc.target/i386/cond_op_maxmin_ub-1.c: New test.
* gcc.target/i386/cond_op_maxmin_ub-2.c: New test.
* gcc.target/i386/cond_op_maxmin_ud-1.c: New test.
* gcc.target/i386/cond_op_maxmin_ud-2.c: New test.
* gcc.target/i386/cond_op_maxmin_uq-1.c: New test.
* gcc.target/i386/cond_op_maxmin_uq-2.c: New test.
* gcc.target/i386/cond_op_maxmin_uw-1.c: New test.
* gcc.target/i386/cond_op_maxmin_uw-2.c: New test.
* gcc.target/i386/cond_op_maxmin_w-1.c: New test.
* gcc.target/i386/cond_op_maxmin_w-2.c: New test.

Daily bump.

analyzer: initial implementation of asm support [PR101570]

gcc/ChangeLog:
PR analyzer/101570
* Makefile.in (ANALYZER_OBJS): Add analyzer/region-model-asm.o.

gcc/analyzer/ChangeLog:
PR analyzer/101570
* analyzer.cc (maybe_reconstruct_from_def_stmt): Add GIMPLE_ASM
case.
* analyzer.h (class asm_output_svalue): New forward decl.
(class reachable_regions): New forward decl.
* complexity.cc (complexity::from_vec_svalue): New.
* complexity.h (complexity::from_vec_svalue): New decl.
* engine.cc (feasibility_state::maybe_update_for_edge): Handle
asm stmts by calling on_asm_stmt.
* region-model-asm.cc: New file.
* region-model-manager.cc
(region_model_manager::maybe_fold_asm_output_svalue): New.
(region_model_manager::get_or_create_asm_output_svalue): New.
(region_model_manager::log_stats): Log m_asm_output_values_map.
* region-model.cc (region_model::on_stmt_pre): Handle GIMPLE_ASM.
* region-model.h (visitor::visit_asm_output_svalue): New.
(region_model_manager::get_or_create_asm_output_svalue): New decl.
(region_model_manager::maybe_fold_asm_output_svalue): New decl.
(region_model_manager::asm_output_values_map_t): New typedef.
(region_model_manager::m_asm_output_values_map): New field.
(region_model::on_asm_stmt): New.
* store.cc (binding_cluster::on_asm): New.
* store.h (binding_cluster::on_asm): New decl.
* svalue.cc (svalue::cmp_ptr): Handle SK_ASM_OUTPUT.
(asm_output_svalue::dump_to_pp): New.
(asm_output_svalue::dump_input): New.
(asm_output_svalue::input_idx_to_asm_idx): New.
(asm_output_svalue::accept): New.
* svalue.h (enum svalue_kind): Add SK_ASM_OUTPUT.
(svalue::dyn_cast_asm_output_svalue): New.
(class asm_output_svalue): New.
(is_a_helper <const asm_output_svalue *>::test): New.
(struct default_hash_traits<asm_output_svalue::key_t>): New.

gcc/testsuite/ChangeLog:
PR analyzer/101570
* gcc.dg/analyzer/asm-x86-1.c: New test.
* gcc.dg/analyzer/asm-x86-lp64-1.c: New test.
* gcc.dg/analyzer/asm-x86-lp64-2.c: New test.
* gcc.dg/analyzer/pr101570.c: New test.
* gcc.dg/analyzer/torture/asm-x86-linux-array_index_mask_nospec.c:
New test.
* gcc.dg/analyzer/torture/asm-x86-linux-cpuid-paravirt-1.c: New
test.
* gcc.dg/analyzer/torture/asm-x86-linux-cpuid-paravirt-2.c: New
test.
* gcc.dg/analyzer/torture/asm-x86-linux-cpuid.c: New test.
* gcc.dg/analyzer/torture/asm-x86-linux-rdmsr-paravirt.c: New
test.
* gcc.dg/analyzer/torture/asm-x86-linux-rdmsr.c: New test.
* gcc.dg/analyzer/torture/asm-x86-linux-wfx_get_ps_timeout-full.c:
New test.
* gcc.dg/analyzer/torture/asm-x86-linux-wfx_get_ps_timeout-reduced.c:
New test.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>

x86: Update STORE_MAX_PIECES

Update STORE_MAX_PIECES to allow 16/32/64 bytes only if inter-unit move
is enabled since vec_duplicate enabled by inter-unit move is used to
implement store_by_pieces of 16/32/64 bytes.

gcc/

PR target/101742
* config/i386/i386.h (STORE_MAX_PIECES): Allow 16/32/64 bytes
only if TARGET_INTER_UNIT_MOVES_TO_VEC is true.

gcc/testsuite/

PR target/101742
* gcc.target/i386/pr101742a.c: New test.
* gcc.target/i386/pr101742b.c: Likewise.

x86: Avoid stack realignment when copying data with SSE register

To avoid stack realignment, call ix86_gen_scratch_sse_rtx to get a
scratch SSE register to copy data with with SSE register from one
memory location to another.

gcc/

PR target/101772
* config/i386/i386-expand.c (ix86_expand_vector_move): Call
ix86_gen_scratch_sse_rtx to get a scratch SSE register to copy
data with SSE register from one memory location to another.

gcc/testsuite/

PR target/101772
* gcc.target/i386/eh_return-2.c: New test.

IBM Z: Implement TARGET_VECTORIZE_VEC_PERM_CONST for vpdi

This patch makes use of the vector permute double immediate
instruction for constant permute vectors.

gcc/ChangeLog:

* config/s390/s390.c (expand_perm_with_vpdi): New function.
(vectorize_vec_perm_const_1): Call expand_perm_with_vpdi.
* config/s390/vector.md (*vpdi1<mode>, @vpdi1<mode>): Enable a
parameterized expander.
(*vpdi4<mode>, @vpdi4<mode>): Likewise.

gcc/testsuite/ChangeLog:

* gcc.target/s390/vector/perm-vpdi.c: New test.

IBM Z: Implement TARGET_VECTORIZE_VEC_PERM_CONST for vector merge

This patch implements the TARGET_VECTORIZE_VEC_PERM_CONST in the IBM Z
backend. The initial implementation only exploits the vector merge
instruction but there is more to come.

gcc/ChangeLog:

* config/s390/s390.c (MAX_VECT_LEN): Define macro.
(struct expand_vec_perm_d): Define struct.
(expand_perm_with_merge): New function.
(vectorize_vec_perm_const_1): New function.
(s390_vectorize_vec_perm_const): New function.
(TARGET_VECTORIZE_VEC_PERM_CONST): Define target macro.

gcc/testsuite/ChangeLog:

* gcc.target/s390/vector/perm-merge.c: New test.
* gcc.target/s390/vector/vec-types.h: New test.

IBM Z: Remove redundant V_HW_64 mode iterator.

gcc/ChangeLog:

* config/s390/vector.md (V_HW_64): Remove mode iterator.
(*vec_load_pair<mode>): Use V_HW_2 instead of V_HW_64.
* config/s390/vx-builtins.md
(vec_scatter_element<V_HW_2:mode>_SI): Use V_HW_2 instead of
V_HW_64.

IBM Z: Get rid of vpdi unspec

The patch gets rid of the unspec used for the vector permute double
immediate instruction and replaces it with generic rtx.

gcc/ChangeLog:

* config/s390/s390.md (UNSPEC_VEC_PERMI): Remove constant
definition.
* config/s390/vector.md (*vpdi1<mode>, *vpdi4<mode>): New pattern
definitions.
* config/s390/vx-builtins.md (*vec_permi<mode>): Emit generic rtx
instead of an unspec.

gcc/testsuite/ChangeLog:

* gcc.target/s390/zvector/vec-permi.c: Removed.
* gcc.target/s390/zvector/vec_permi.c: New test.

IBM Z: Get rid of vec merge unspec

This patch gets rid of the unspecs we were using for the vector merge
instruction and replaces it with generic rtx.

gcc/ChangeLog:

* config/s390/s390-modes.def: Add more vector modes to support
concatenation of two vectors.
* config/s390/s390-protos.h (s390_expand_merge_perm_const): Add
prototype.
(s390_expand_merge): Likewise.
* config/s390/s390.c (s390_expand_merge_perm_const): New function.
(s390_expand_merge): New function.
* config/s390/s390.md (UNSPEC_VEC_MERGEH, UNSPEC_VEC_MERGEL):
Remove constant definitions.
* config/s390/vector.md (V_HW_2): Add mode iterators.
(VI_HW_4, V_HW_4): Rename VI_HW_4 to V_HW_4.
(vec_2x_nelts, vec_2x_wide): New mode attributes.
(*vmrhb, *vmrlb, *vmrhh, *vmrlh, *vmrhf, *vmrlf, *vmrhg, *vmrlg):
New pattern definitions.
(vec_widen_umult_lo_<mode>, vec_widen_umult_hi_<mode>)
(vec_widen_smult_lo_<mode>, vec_widen_smult_hi_<mode>)
(vec_unpacks_lo_v4sf, vec_unpacks_hi_v4sf, vec_unpacks_lo_v2df)
(vec_unpacks_hi_v2df): Adjust expanders to emit non-unspec RTX for
vec merge.
* config/s390/vx-builtins.md (V_HW_4): Remove mode iterator. Now
in vector.md.
(vec_mergeh<mode>, vec_mergel<mode>): Use s390_expand_merge to
emit vec merge pattern.

gcc/testsuite/ChangeLog:

* gcc.target/s390/vector/long-double-asm-in-out-hard-fp-reg.c:
Instead of vpdi with 0 and 5 vmrlg and vmrhg are used now.
* gcc.target/s390/vector/long-double-asm-inout-hard-fp-reg.c: Likewise.
* gcc.target/s390/zvector/vec-types.h: New test.
* gcc.target/s390/zvector/vec_merge.c: New test.

aarch64: Don't include vec_select high-half in SIMD multiply cost

The Neon multiply/multiply-accumulate/multiply-subtract instructions
can select the top or bottom half of the operand registers. This
selection does not change the cost of the underlying instruction and
this should be reflected by the RTL cost function.

This patch adds RTL tree traversal in the Neon multiply cost function
to match vec_select high-half of its operands. This traversal
prevents the cost of the vec_select from being added into the cost of
the multiply - meaning that these instructions can now be emitted in
the combine pass as they are no longer deemed prohibitively
expensive.

gcc/ChangeLog:

2021-07-19  Jonathan Wright  <jonathan.wright@arm.com>

* config/aarch64/aarch64.c (aarch64_strip_extend_vec_half):
Define.
(aarch64_rtx_mult_cost): Traverse RTL tree to prevent cost of
vec_select high-half from being added into Neon multiply
cost.
* rtlanal.c (vec_series_highpart_p): Define.
* rtlanal.h (vec_series_highpart_p): Declare.

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/vmul_high_cost.c: New test.

aarch64: Don't include vec_select element in SIMD multiply cost

The Neon multiply/multiply-accumulate/multiply-subtract instructions
can take various forms - multiplying full vector registers of values
or multiplying one vector by a single element of another. Regardless
of the form used, these instructions have the same cost, and this
should be reflected by the RTL cost function.

This patch adds RTL tree traversal in the Neon multiply cost function
to match the vec_select used by the lane-referencing forms of the
instructions already mentioned. This traversal prevents the cost of
the vec_select from being added into the cost of the multiply -
meaning that these instructions can now be emitted in the combine
pass as they are no longer deemed prohibitively expensive.

gcc/ChangeLog:

2021-07-19  Jonathan Wright  <jonathan.wright@arm.com>

* config/aarch64/aarch64.c (aarch64_strip_duplicate_vec_elt):
Define.
(aarch64_rtx_mult_cost): Traverse RTL tree to prevent
vec_select cost from being added into Neon multiply cost.

gcc/testsuite/ChangeLog:

* gcc.target/aarch64/vmul_element_cost.c: New test.

vect: Tweak comparisons with existing epilogue loops

This patch uses a more accurate scalar iteration estimate when
comparing the epilogue of a constant-iteration loop with a candidate
replacement epilogue.

In the testcase, the patch prevents a 1-to-3-element SVE epilogue
from seeming better than a 64-bit Advanced SIMD epilogue.

gcc/
* tree-vect-loop.c (vect_better_loop_vinfo_p): Detect cases in
which old_loop_vinfo is an epilogue loop that handles a constant
number of iterations.

gcc/testsuite/
* gcc.target/aarch64/sve/cost_model_12.c: New test.

vect: Tweak dump messages for vector mode choice

After vect_analyze_loop has successfully analysed a loop for
one base vector mode B1, it considers using following base vector
modes to vectorise an epilogue.  However, for VECT_COMPARE_COSTS,
a later mode B2 might turn out to be better than B1 was.  Initially
this comparison will be between an epilogue loop (for B2) and a main
loop (for B1).  However, in r11-6458 I'd added code to reanalyse the
B2 epilogue loop as a main loop, partly for correctness and partly
for better costing.

This can lead to a situation in which we think that the B2 epilogue
loop was better than the B1 main loop, but that the B2 main loop is
not better than the B1 main loop.  There was no dump message to say
that this had happened, which made it look like B2 had still won.

gcc/
* tree-vect-loop.c (vect_analyze_loop): Print a dump message
when a reanalyzed loop fails to be cheaper than the current
main loop.

aarch64: Fix a typo

gcc/
* config/aarch64/aarch64.c: Fix a typo.

gcov: check return code of a fclose

gcc/ChangeLog:

PR gcov-profile/101773
* gcov-io.c (gcov_close): Check return code of a fclose.

Fix debug info for ignored decls at start of assembly

Ignored functions decls that are compiled at the start of
the assembly have bogus line numbers until the first .file
directive, as reported in PR101575.

The corresponding binutils bug report is
https://sourceware.org/bugzilla/show_bug.cgi?id=28149

The work around for this issue is to emit a dummy .file
directive before the first function is compiled, unless
another .file directive was already emitted previously.

2021-08-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

PR ada/101575
* dwarf2out.c (dwarf2out_assembly_start): Emit a dummy
.file statement when needed.

[testsuite] Fix trapping access in test PR101750

I believe PR101750 to be a testism. Fix it by giving the class a name.

gcc/testsuite/ChangeLog:

PR tree-optimization/101750
* g++.dg/vect/pr99149.cc: Name class.

Add emulated gather capability to the vectorizer

This adds a gather vectorization capability to the vectorizer
without target support by decomposing the offset vector, doing
sclar loads and then building a vector from the result.  This
is aimed mainly at cases where vectorizing the rest of the loop
offsets the cost of vectorizing the gather.

Note it's difficult to avoid vectorizing the offset load, but in
some cases later passes can turn the vector load + extract into
scalar loads, see the followup patch.

On SPEC CPU 2017 510.parest_r this improves runtime from 250s
to 219s on a Zen2 CPU which has its native gather instructions
disabled (using those the runtime instead increases to 254s)
using -Ofast -march=znver2 [-flto].  It turns out the critical
loops in this benchmark all perform gather operations.

2021-07-30  Richard Biener  <rguenther@suse.de>

* tree-vect-data-refs.c (vect_check_gather_scatter):
Include widening conversions only when the result is
still handed by native gather or the current offset
size not already matches the data size.
Also succeed analysis in case there's no native support,
noted by a IFN_LAST ifn and a NULL decl.
(vect_analyze_data_refs): Always consider gathers.
* tree-vect-patterns.c (vect_recog_gather_scatter_pattern):
Test for no IFN gather rather than decl gather.
* tree-vect-stmts.c (vect_model_load_cost): Pass in the
gather-scatter info and cost emulated gathers accordingly.
(vect_truncate_gather_scatter_offset): Properly test for
no IFN gather.
(vect_use_strided_gather_scatters_p): Likewise.
(get_load_store_type): Handle emulated gathers and its
restrictions.
(vectorizable_load): Likewise.  Emulate them by extracting
scalar offsets, doing scalar loads and a vector construct.

* gcc.target/i386/vect-gather-1.c: New testcase.
* gfortran.dg/vect/vect-8.f90: Adjust.

by_pieces: Pass MAX_PIECES to op_by_pieces_d

Pass MAX_PIECES to op_by_pieces_d::op_by_pieces_d for move, store and
compare.

PR target/101742
* expr.c (op_by_pieces_d::op_by_pieces_d): Add a max_pieces
argument to set m_max_size.
(move_by_pieces_d): Pass MOVE_MAX_PIECES to op_by_pieces_d.
(store_by_pieces_d): Pass STORE_MAX_PIECES to op_by_pieces_d.
(compare_by_pieces_d): Pass COMPARE_MAX_PIECES to op_by_pieces_d.

Fold (X<<C1)^(X<<C2) to a multiplication when possible.

The easiest way to motivate these additions to match.pd is with the
following example:

unsigned int foo(unsigned char i) {
  return i | (i<<8) | (i<<16) | (i<<24);
}

which mainline with -O2 on x86_64 currently generates:
foo: movzbl  %dil, %edi
movl    %edi, %eax
movl    %edi, %edx
sall    $8, %eax
sall    $16, %edx
orl     %edx, %eax
orl     %edi, %eax
sall    $24, %edi
orl     %edi, %eax
ret

but with this patch now becomes:
foo: movzbl  %dil, %eax
        imull   $16843009, %eax, %eax
        ret

Interestingly, this transformation is already applied when using
addition, allowing synth_mult to select an optimal sequence, but
not when using the equivalent bit-wise ior or xor operators.

The solution is to use tree_nonzero_bits to check that the
potentially non-zero bits of each operand don't overlap, which
ensures that BIT_IOR_EXPR and BIT_XOR_EXPR produce the same
results as PLUS_EXPR, which effectively generalizes the old
fold_plusminus_mult_expr.  Technically, the transformation
is to canonicalize (X*C1)|(X*C2) and (X*C1)^(X*C2) to
X*(C1+C2) where X and X<<C are considered special cases.

2021-08-04  Roger Sayle  <roger@nextmovesoftware.com>
    Marc Glisse  <marc.glisse@inria.fr>

gcc/ChangeLog
* match.pd (bit_ior, bit_xor): Canonicalize (X*C1)|(X*C2) and
(X*C1)^(X*C2) as X*(C1+C2), and related variants, using
tree_nonzero_bits to ensure that operands are bit-wise disjoint.

gcc/testsuite/ChangeLog
* gcc.dg/fold-ior-4.c: New test.

libstdc++: Add [[nodiscard]] to sequence containers

... and container adaptors.

This adds the [[nodiscard]] attribute to functions with no side-effects
for the sequence containers and their iterators, and the debug versions
of those containers, and the container adaptors,

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:

* include/bits/forward_list.h: Add [[nodiscard]] to functions
with no side-effects.
* include/bits/stl_bvector.h: Likewise.
* include/bits/stl_deque.h: Likewise.
* include/bits/stl_list.h: Likewise.
* include/bits/stl_queue.h: Likewise.
* include/bits/stl_stack.h: Likewise.
* include/bits/stl_vector.h: Likewise.
* include/debug/deque: Likewise.
* include/debug/forward_list: Likewise.
* include/debug/list: Likewise.
* include/debug/safe_iterator.h: Likewise.
* include/debug/vector: Likewise.
* include/std/array: Likewise.
* testsuite/23_containers/array/creation/3_neg.cc: Use
-Wno-unused-result.
* testsuite/23_containers/array/debug/back1_neg.cc: Cast result
to void.
* testsuite/23_containers/array/debug/back2_neg.cc: Likewise.
* testsuite/23_containers/array/debug/front1_neg.cc: Likewise.
* testsuite/23_containers/array/debug/front2_neg.cc: Likewise.
* testsuite/23_containers/array/debug/square_brackets_operator1_neg.cc:
Likewise.
* testsuite/23_containers/array/debug/square_brackets_operator2_neg.cc:
Likewise.
* testsuite/23_containers/array/tuple_interface/get_neg.cc:
Adjust dg-error line numbers.
* testsuite/23_containers/deque/cons/clear_allocator.cc: Cast
result to void.
* testsuite/23_containers/deque/debug/invalidation/4.cc:
Likewise.
* testsuite/23_containers/deque/types/1.cc: Use
-Wno-unused-result.
* testsuite/23_containers/list/types/1.cc: Cast result to void.
* testsuite/23_containers/priority_queue/members/7161.cc:
Likewise.
* testsuite/23_containers/queue/members/7157.cc: Likewise.
* testsuite/23_containers/vector/59829.cc: Likewise.
* testsuite/23_containers/vector/ext_pointer/types/1.cc:
Likewise.
* testsuite/23_containers/vector/ext_pointer/types/2.cc:
Likewise.
* testsuite/23_containers/vector/types/1.cc: Use
-Wno-unused-result.

libstdc++: Add [[nodiscard]] to iterators and related utilities

This adds [[nodiscard]] throughout <iterator>, as proposed by P2377R0
(with some minor corrections).

The attribute is added for all modes from C++11 up, using
[[__nodiscard__]] or _GLIBCXX_NODISCARD where C++17 [[nodiscard]] can't
be used directly.

Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
libstdc++-v3/ChangeLog:

* include/bits/iterator_concepts.h (iter_move): Add
[[nodiscard]].
* include/bits/range_access.h (begin, end, cbegin, cend)
(rbegin, rend, crbegin, crend, size, data, ssize): Likewise.
* include/bits/ranges_base.h (ranges::begin, ranges::end)
(ranges::cbegin, ranges::cend, ranges::rbegin, ranges::rend)
(ranges::crbegin, ranges::crend, ranges::size, ranges::ssize)
(ranges::empty, ranges::data, ranges::cdata): Likewise.
* include/bits/stl_iterator.h (reverse_iterator, __normal_iterator)
(back_insert_iterator, front_insert_iterator, insert_iterator)
(move_iterator, move_sentinel, common_iterator)
(counted_iterator): Likewise.
* include/bits/stl_iterator_base_funcs.h (distance, next, prev):
Likewise.
* include/bits/stream_iterator.h (istream_iterator)
(ostream_iterartor): Likewise.
* include/bits/streambuf_iterator.h (istreambuf_iterator)
(ostreambuf_iterator): Likewise.
* include/std/ranges (views::single, views::iota, views::all)
(views::filter, views::transform, views::take, views::take_while)
(views::drop, views::drop_while, views::join, views::lazy_split)
(views::split, views::counted, views::common, views::reverse)
(views::elements): Likewise.
* testsuite/20_util/rel_ops.cc: Use -Wno-unused-result.
* testsuite/24_iterators/move_iterator/greedy_ops.cc: Likewise.
* testsuite/24_iterators/normal_iterator/greedy_ops.cc:
Likewise.
* testsuite/24_iterators/reverse_iterator/2.cc: Likewise.
* testsuite/24_iterators/reverse_iterator/greedy_ops.cc:
Likewise.
* testsuite/21_strings/basic_string/range_access/char/1.cc:
Cast result to void.
* testsuite/21_strings/basic_string/range_access/wchar_t/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/range_access/char/1.cc:
Likewise.
* testsuite/21_strings/basic_string_view/range_access/wchar_t/1.cc:
Likewise.
* testsuite/23_containers/array/range_access.cc: Likewise.
* testsuite/23_containers/deque/range_access.cc: Likewise.
* testsuite/23_containers/forward_list/range_access.cc:
Likewise.
* testsuite/23_containers/list/range_access.cc: Likewise.
* testsuite/23_containers/map/range_access.cc: Likewise.
* testsuite/23_containers/multimap/range_access.cc: Likewise.
* testsuite/23_containers/multiset/range_access.cc: Likewise.
* testsuite/23_containers/set/range_access.cc: Likewise.
* testsuite/23_containers/unordered_map/range_access.cc:
Likewise.
* testsuite/23_containers/unordered_multimap/range_access.cc:
Likewise.
* testsuite/23_containers/unordered_multiset/range_access.cc:
Likewise.
* testsuite/23_containers/unordered_set/range_access.cc:
Likewise.
* testsuite/23_containers/vector/range_access.cc: Likewise.
* testsuite/24_iterators/customization_points/iter_move.cc:
Likewise.
* testsuite/24_iterators/istream_iterator/sentinel.cc:
Likewise.
* testsuite/24_iterators/istreambuf_iterator/sentinel.cc:
Likewise.
* testsuite/24_iterators/move_iterator/dr2061.cc: Likewise.
* testsuite/24_iterators/operations/prev_neg.cc: Likewise.
* testsuite/24_iterators/ostreambuf_iterator/2.cc: Likewise.
* testsuite/24_iterators/range_access/range_access.cc:
Likewise.
* testsuite/24_iterators/range_operations/100768.cc: Likewise.
* testsuite/26_numerics/valarray/range_access2.cc: Likewise.
* testsuite/28_regex/range_access.cc: Likewise.
* testsuite/experimental/string_view/range_access/char/1.cc:
Likewise.
* testsuite/experimental/string_view/range_access/wchar_t/1.cc:
Likewise.
* testsuite/ext/vstring/range_access.cc: Likewise.
* testsuite/std/ranges/adaptors/take.cc: Likewise.
* testsuite/std/ranges/p2259.cc: Likewise.

Rewrite more vector loads to scalar loads

This teaches forwprop to rewrite more vector loads that are only
used in BIT_FIELD_REFs as scalar loads.  This provides the
remaining uplift to SPEC CPU 2017 510.parest_r on Zen 2 which
has CPU gathers disabled.

In particular vector load + vec_unpack + bit-field-ref is turned
into (extending) scalar loads which avoids costly XMM/GPR
transitions.  To not conflict with vector load + bit-field-ref
+ vector constructor matching to vector load + shuffle the
extended transform is only done after vector lowering.

2021-07-30  Richard Biener  <rguenther@suse.de>

* tree-ssa-forwprop.c (pass_forwprop::execute): Split
out code to decompose vector loads ...
(optimize_vector_load): ... here.  Generalize it to
handle intermediate widening and TARGET_MEM_REF loads
and apply it to loads with a supported vector mode as well.

tree-optimization/101756 - avoid vectorizing boolean MAX reductions

The following avoids vectorizing MIN/MAX reductions on bools which,
when ending up as vector(2) <signed-boolean:64> would need to be
adjusted because of the sign change.  The fix instead avoids any
reduction vectorization where the result isn't compatible
to the original scalar type since we don't compensate for that
either.

2021-08-04  Richard Biener  <rguenther@suse.de>

PR tree-optimization/101756
* tree-vect-slp.c (vectorizable_bb_reduc_epilogue): Make sure
the result of the reduction epilogue is compatible to the original
scalar result.

* gcc.dg/vect/bb-slp-pr101756.c: New testcase.

c++: Fix up #pragma omp declare {simd,variant} and acc routine parsing

When parsing default arguments, we need to temporarily clear parser->omp_declare_simd
and parser->oacc_routine, otherwise it can clash with further declarations
inside of e.g. lambdas inside of those default arguments.

2021-08-04  Jakub Jelinek  <jakub@redhat.com>

PR c++/101759
* parser.c (cp_parser_default_argument): Temporarily override
parser->omp_declare_simd and parser->oacc_routine to NULL.

* g++.dg/gomp/pr101759.C: New test.
* g++.dg/goacc/pr101759.C: New test.

testsuite: Fix duplicated content of gcc.c-torture/execute/ieee/pr29302-1.x

The file has two identical halves, seems like twice applied patch.

2021-08-04  Jakub Jelinek  <jakub@redhat.com>

* gcc.c-torture/execute/ieee/pr29302-1.x: Undo doubly applied patch.

Refine predicate of peephole2 to general_reg_operand. [PR target/101743]

The define_peephole2 which is added by r12-2640-gf7bf03cf69ccb7dc
should only work on general registers, considering that x86 also
supports mov instructions between gpr, sse reg, mask reg, limiting the
peephole2 predicate to general_reg_operand.

gcc/ChangeLog:

PR target/101743
* config/i386/i386.md (peephole2): Refine predicate from
register_operand to general_reg_operand.

libgcc: Fix duplicated content of config/t-slibgcc-fuchsia

The file has two identical halves, seems like twice applied patch.

2021-08-04  Jakub Jelinek  <jakub@redhat.com>

* config/t-slibgcc-fuchsia: Undo doubly applied patch.

Mark path_range_query::dump as override.

gcc/ChangeLog:

* gimple-range-path.h (path_range_query::dump): Mark override.

tree-optimization/101769 - tail recursion creates possibly infinite loop

This makes tail recursion optimization produce a loop structure
manually rather than relying on loop fixup.  That also allows the
loop to be marked as finite (it would eventually blow the stack
if it were not).

2021-08-04  Richard Biener  <rguenther@suse.de>

PR tree-optimization/101769
* tree-tailcall.c (eliminate_tail_call): Add the created loop
for the first recursion and return it via the new output parameter.
(optimize_tail_call): Pass through new output param.
(tree_optimize_tail_calls_1): After creating all latches,
add the created loop to the loop tree.  Do not mark loops for fixup.

* g++.dg/tree-ssa/pr101769.C: New testcase.

docs: document threader-mode param

gcc/ChangeLog:

* doc/invoke.texi: Document threader-mode param.

Add dg-require-effective-target for testcases.

gcc/testsuite/ChangeLog:

* gcc.target/i386/cond_op_addsubmul_d-2.c: Add
dg-require-effective-target for avx512.
* gcc.target/i386/cond_op_addsubmul_q-2.c: Ditto.
* gcc.target/i386/cond_op_addsubmul_w-2.c: Ditto.
* gcc.target/i386/cond_op_addsubmuldiv_double-2.c: Ditto.
* gcc.target/i386/cond_op_addsubmuldiv_float-2.c: Ditto.
* gcc.target/i386/cond_op_fma_double-2.c: Ditto.
* gcc.target/i386/cond_op_fma_float-2.c: Ditto.

Support cond_{fma,fms,fnma,fnms} for vector float/double under AVX512.

gcc/ChangeLog:

* config/i386/sse.md (cond_fma<mode>): New expander.
(cond_fms<mode>): Ditto.
(cond_fnma<mode>): Ditto.
(cond_fnms<mode>): Ditto.

gcc/testsuite/ChangeLog:

* gcc.target/i386/cond_op_fma_double-1.c: New test.
* gcc.target/i386/cond_op_fma_double-2.c: New test.
* gcc.target/i386/cond_op_fma_float-1.c: New test.
* gcc.target/i386/cond_op_fma_float-2.c: New test.

compiler: support new language constructs in escape analysis

Previous CLs add new language constructs in Go 1.17, specifically,
unsafe.Add, unsafe.Slice, and conversion from a slice to a pointer
to an array. This CL handles them in the escape analysis.

At the point of the escape analysis, unsafe.Add and unsafe.Slice
are still builtin calls, so just handle them in data flow.
Conversion from a slice to a pointer to an array has already been
lowered to a combination of compound expression, conditional
expression and slice info expressions, so handle them in the
escape analysis.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/339671

Daily bump.

compile, runtime: make selectnbrecv return two values

The only different between selectnbrecv and selectnbrecv2 is the later
set the input pointer value by second return value from chanrecv.

So by making selectnbrecv return two values from chanrecv, we can get
rid of selectnbrecv2, the compiler can now call only selectnbrecv and
generate simpler code.

This is the gofrontend version of https://golang.org/cl/292890.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/339529

compiler: check slice to pointer-to-array conversion element type

When checking a slice to pointer-to-array conversion, I forgot to
verify that the elements types are identical.

For golang/go#395

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/339329

rs6000: Replace & by &&

2021-08-03  Segher Boessenkool  <segher@kernel.crashing.org>

* config/rs6000/vsx.md (*vsx_le_perm_store_<mode>): Use && instead of &.