gcc/ChangeLog:

	* config/riscv/riscv.c (riscv_rtx_costs): Handle cost model
	for zbs extension.

2021-10-25  Jim Wilson  <jimw@sifive.com>
	    Kito Cheng  <kito.cheng@sifive.com>

gcc/ChangeLog:

	* config/riscv/bitmanip.md (shiftm1): New.
	(*bset<mode>): Ditto.
	(*bset<mode>_mask): Ditto.
	(*bset<mode>_1): Ditto.
	(*bset<mode>_1_mask): Ditto.
	(*bseti<mode>): Ditto.
	(*bclr<mode>): Ditto.
	(*bclri<mode>): Ditto.
	(*binv<mode>): Ditto.
	(*binvi<mode>): Ditto.
	(*bext<mode>): Ditto.
	(*bexti): Ditto.
	* config/riscv/predicates.md (splittable_const_int_operand):
	Handle bseti.
	(single_bit_mask_operand): New.
	(not_single_bit_mask_operand): Ditto.
	(const31_operand): Ditto.
	(const63_operand): Ditto.
	* config/riscv/riscv.c (riscv_build_integer_1): Handle bseti.
	(riscv_output_move): Ditto.
	(riscv_print_operand): Handle new operand type: T and S.
	* config/riscv/riscv.h (SINGLE_BIT_MASK_OPERAND): New.

2021-10-25  Jia-Wei Chen  <jiawei@iscas.ac.cn>
	    Shi-Hua Liao  <shihua@iscas.ac.cn>

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zba-slliuw.c: Apply zbs to this testcase.
	* gcc.target/riscv/zbs-bclr.c: New.
	* gcc.target/riscv/zbs-bext.c: Ditto.
	* gcc.target/riscv/zbs-binv.c: Ditto.
	* gcc.target/riscv/zbs-bset.c: Ditto.

Co-authored-by: Kito Cheng <kito.cheng@sifive.com>
Co-authored-by: Jia-Wei Chen <jiawei@iscas.ac.cn>
Co-authored-by: Shi-Hua Liao <shihua@iscas.ac.cn>

gcc/ChangeLog:

	* config/riscv/riscv.c (riscv_build_integer_1): Build integer
	with rotate.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zbb-li-rotr.c: New.

2021-10-25  Kito Cheng  <kito.cheng@sifive.com>

gcc/ChangeLog:

	* config/riscv/riscv.c (riscv_extend_cost): Handle cost model
	for zbb extension.
	(riscv_rtx_costs): Ditto.

2021-10-25  Jim Wilson  <jimw@sifive.com>
	    Kito Cheng  <kito.cheng@sifive.com>
	    Jia-Wei Chen  <jiawei@iscas.ac.cn>

gcc/ChangeLog:

	* config/riscv/bitmanip.md (bitmanip_bitwise): New.
	(bitmanip_minmax): New.
	(clz_ctz_pcnt): New.
	(bitmanip_optab): New.
	(bitmanip_insn): New.
	(*<optab>_not<mode>): New.
	(*xor_not<mode>): New.
	(<bitmanip_optab>si2): New.
	(*<bitmanip_optab>disi2): New.
	(<bitmanip_optab>di2): New.
	(*zero_extendhi<GPR:mode>2_bitmanip): New.
	(*extend<SHORT:mode><SUPERQI:mode>2_zbb): New.
	(*zero_extendhi<GPR:mode>2_zbb): New.
	(rotrsi3): New.
	(rotrdi3): New.
	(rotrsi3_sext): New.
	(rotlsi3): New.
	(rotldi3): New.
	(rotlsi3_sext): New.
	(bswap<mode>2): New.
	(<bitmanip_optab><mode>3): New.
	* config/riscv/riscv.md (type): Add rotate.
	(zero_extendhi<GPR:mode>2): Change to define_expand pattern.
	(*zero_extendhi<GPR:mode>2): New.
	(extend<SHORT:mode><SUPERQI:mode>2): Change to define_expand pattern.
	(*extend<SHORT:mode><SUPERQI:mode>2): New.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zbb-andn-orn-xnor-01.c: New.
	* gcc.target/riscv/zbb-andn-orn-xnor-02.c: Ditto.
	* gcc.target/riscv/zbb-min-max.c: Ditto.
	* gcc.target/riscv/zbb-rol-ror-01.c: Ditto.
	* gcc.target/riscv/zbb-rol-ror-02.c: Ditto.
	* gcc.target/riscv/zbb-rol-ror-03.c: Ditto.
	* gcc.target/riscv/zbbw.c: Ditto.

Co-authored-by: Kito Cheng <kito.cheng@sifive.com>
Co-authored-by: Jia-Wei Chen <jiawei@iscas.ac.cn>

gcc/ChangeLog:

	* config/riscv/riscv.c (riscv_extend_cost): Handle cost model
	for zba extension.
	(riscv_rtx_costs): Ditto.

2021-10-25  Jim Wilson  <jimw@sifive.com>
	    Kito Cheng  <kito.cheng@sifive.com>
	    Jia-Wei Chen  <jiawei@iscas.ac.cn>

gcc/ChangeLog:

	* config/riscv/bitmanip.md (*zero_extendsidi2_bitmanip): New.
	(*shNadd): Ditto.
	(*shNadduw): Ditto.
	(*add.uw): Ditto.
	(*slliuw): Ditto.
	(riscv_rtx_costs): Ditto.
	* config/riscv/riscv.md: Include bitmanip.md
	(type): Add bitmanip bype.
	(zero_extendsidi2): Change to define_expand pattern.
	(*zero_extendsidi2_internal): New.
	(zero_extendsidi2_shifted): Disable for ZBA.

2021-10-25  Kito Cheng  <kito.cheng@sifive.com>
	    Jia-Wei Chen  <jiawei@iscas.ac.cn>

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/zba-adduw.c: New.
	* gcc.target/riscv/zba-shNadd-01.c: Ditto.
	* gcc.target/riscv/zba-shNadd-02.c: Ditto.
	* gcc.target/riscv/zba-shNadd-03.c: Ditto.
	* gcc.target/riscv/zba-slliuw.c: Ditto.
	* gcc.target/riscv/zba-zextw.c: Ditto.

Co-authored-by: Kito Cheng <kito.cheng@sifive.com>
Co-authored-by: Jia-Wei Chen <jiawei@iscas.ac.cn>

2021-10-25  Kito Cheng  <kito.cheng@sifive.com>

gcc/ChangeLog:

	* common/config/riscv/riscv-common.c (riscv_ext_version_table):
	Add zba, zbb, zbc and zbs.
	(riscv_ext_flag_table): Ditto.
	* config/riscv/riscv-opts.h (MASK_ZBA): New.
	(MASK_ZBB): Ditto.
	(MASK_ZBC): Ditto.
	(MASK_ZBS): Ditto.
	(TARGET_ZBA): Ditto.
	(TARGET_ZBB): Ditto.
	(TARGET_ZBC): Ditto.
	(TARGET_ZBS): Ditto.
	* config/riscv/riscv.opt (riscv_zb_subext): New.

In --enable-checking=release builds (which is the default on release
branches), I'm getting various extra FAILs that don't appear in
--enable-checking=yes builds.

XPASS: g++.dg/cpp0x/constexpr-52830.C  -std=c++14 (internal compiler error)
FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++14 (test for excess errors)
XPASS: g++.dg/cpp0x/constexpr-52830.C  -std=c++17 (internal compiler error)
FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++17 (test for excess errors)
XPASS: g++.dg/cpp0x/constexpr-52830.C  -std=c++2a (internal compiler error)
FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++2a (test for excess errors)
FAIL: g++.dg/cpp0x/vt-88982.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/cpp0x/vt-88982.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp0x/vt-88982.C  -std=c++2a (test for excess errors)
FAIL: g++.dg/cpp1y/auto-fn61.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/cpp1y/auto-fn61.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp1y/auto-fn61.C  -std=c++2a (test for excess errors)
FAIL: g++.dg/cpp1z/constexpr-lambda26.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp1z/constexpr-lambda26.C  -std=c++2a (test for excess errors)
FAIL: g++.dg/cpp2a/nontype-class39.C  -std=c++2a (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-1.c  -std=c++14 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-1.c  -std=c++17 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-1.c  -std=c++2a (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-1.c  -std=c++98 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-2.c  -std=c++14 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-2.c  -std=c++17 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-2.c  -std=c++2a (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-2.c  -std=c++98 (test for excess errors)

These are tests that have dg-ice and most of those ICEs are checking ICEs
which go away in release checking when -fno-checking is the default.

The following patch adds -fchecking option to those.

2021-04-21  Jakub Jelinek  <jakub@redhat.com>

	* g++.dg/cpp1z/constexpr-lambda26.C: Add dg-additional-options
	-fchecking.
	* g++.dg/cpp1y/auto-fn61.C: Likewise.
	* g++.dg/cpp2a/nontype-class39.C: Likewise.
	* g++.dg/cpp0x/constexpr-52830.C: Likewise.
	* g++.dg/cpp0x/vt-88982.C: Likewise.
	* c-c++-common/goacc/kernels-decompose-ice-1.c: Add -fchecking to
	dg-additional-options.
	* c-c++-common/goacc/kernels-decompose-ice-2.c: Likewise.

switch_to_section warns if we try to output a retain decl in a
section without a retain flag, or if we try to output a non-retain
decl in a section with a retain flag.  However, the warning only
applied if we were trying to “switch” to the current section.
This works if all decls that use a section are generated consecutively,
but not if there is an unrelated decl in between.

This patch makes the check unconditional, but suppresses the warning
if we're writing the section's named.decl (i.e. the decl from which
the section name and original flags were derived).

Also, the warning didn't fire for -fsection-anchors, for two reasons:
we allowed retain and non-retain decls to be put into the same block,
and we didn't pass a decl to switch_to_section.

Although these are arguably separate bugs, it isn't easy to fix them
independently without temporarily regressing -fsection-anchor targets.

gcc/
	PR middle-end/100130
	* varasm.c (get_block_for_decl): Make sure that any use of the
	retain attribute matches the section's retain flag.
	(switch_to_section): Check for retain mismatches even when
	changing sections, but do not warn if the given decl is the
	section's named.decl.
	(output_object_block): Pass the first decl in the block (if any)
	to switch_to_section.

gcc/testsuite/
	PR middle-end/100130
	* c-c++-common/attr-retain-10.c: New test.
	* c-c++-common/attr-retain-11.c: Likewise.

Adjust the line number due to previous commit,
which added a line for dg-require-effective-target.

2021-05-20  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	* g++.dg/modules/omp-1_c.C: Fix testcase.

gcc/testsuite/ChangeLog:

	* g++.dg/modules/omp-1_a.C: Check pthread is available.
	* g++.dg/modules/omp-1_b.C: Ditto.
	* g++.dg/modules/omp-1_c.C: Ditto.
	* g++.dg/modules/omp-2_a.C: Ditto.
	* g++.dg/modules/omp-2_b.C: Ditto.

	* module.cc: Remove #error that triggers if DEV-PHASE is empty.

2021-04-27  Jakub Jelinek  <jakub@redhat.com>

	* gennews (files): Add files for GCC 10 and GCC 11.

(cherry picked from commit bbadf83e)

gcc/testsuite/
	* substr_9.f90: Move to ...
	* gfortran.dg/substr_9.f90: ... here.
	* substr_10.f90: Move to ...
	* gfortran.dg/substr_10.f90: ... here.

(cherry picked from commit ac456fd9)

The __cond_wait_until_impl function takes a steady_clock timeout, but
then sometimes tries to compare it to a time from the system_clock,
which won't compile.  Additionally, that function gets called with
system_clock timeouts, which also won't compile. This makes the function
accept timeouts for either clock, and compare to the time from the right
clock.

This fixes the compilation error that was causing two tests to fail on
non-futex targets, so we can revert the r12-11 change to disable them.

libstdc++-v3/ChangeLog:

	* include/bits/atomic_timed_wait.h (__cond_wait_until_impl):
	Handle system_clock as well as steady_clock.
	* testsuite/30_threads/semaphore/try_acquire_for.cc: Re-enable.
	* testsuite/30_threads/semaphore/try_acquire_until.cc:
	Re-enable.

(cherry picked from commit 69245887)

This fixes a linker error on AIX:

FAIL: 30_threads/semaphore/try_acquire_posix.cc (test for excess errors)
Excess errors:
ld: 0711-317 ERROR: Undefined symbol: .__atomic_fetch_add_8
ld: 0711-317 ERROR: Undefined symbol: .__atomic_load_8
ld: 0711-317 ERROR: Undefined symbol: .__atomic_fetch_sub_8
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
collect2: error: ld returned 8 exit status

libstdc++-v3/ChangeLog:

	* testsuite/30_threads/semaphore/try_acquire_posix.cc: Add
	options for libatomic.

(cherry picked from commit 58871c03)

For types that track whether or not there extant waiters (e.g.
semaphore) internally, the __atomic_notify_address_bare() call was
introduced to avoid the overhead of loading the atomic count of
waiters. For platforms that don't have Futex, however, there was
still a check for waiters, and seeing that there are none (because
in the bare case, the count is not incremented), the notification
is dropped. This commit addresses that case.

libstdc++-v3/ChangeLog:
	* include/bits/atomic_wait.h: Always notify waiters in the
	case of 'bare' address notification.

(cherry picked from commit 2d856af6f9f38fd730754e5024aa82aab3948069)

This removes the #error from <bits/semaphore_base.h> for the case where
neither __atomic_semaphore nor __platform_semaphore is defined.

Also rename the _GLIBCXX_REQUIRE_POSIX_SEMAPHORE macro to
_GLIBCXX_USE_POSIX_SEMAPHORE for consistency with the similar
_GLIBCXX_USE_CXX11_ABI macro that can be used to request an alternative
(ABI-changing) implementation.

libstdc++-v3/ChangeLog:

	PR libstdc++/100179
	* include/bits/semaphore_base.h: Remove #error.
	* include/std/semaphore: Do not define anything unless one of
	the implementations is available.

(cherry picked from commit 4b2db807)

gcc on ia32 miscompiles various atomics involving floating point,
unfortunately I'm afraid it is too late to fix that for 11.1 and
as I'm quite lost on it, it might take a while for 12 too
(disabling all the 8 peephole2s would be easiest, but then we'd
run into optimization regressions).

While 1.cc just FAILs, with dejagnu 1.6.1 wait_notify.cc hangs the
make check even after the timeout fires.  The following patch therefore
xfails the former and skips the latter.

Tested on x86_64-linux where
make check RUNTESTFLAGS='conformance.exp=atomic_float/*.cc'
is still
                === libstdc++ Summary ===

 # of expected passes            8
and on i686-linux, where it is now
                === libstdc++ Summary ===

 # of expected passes            5
 # of expected failures          1
 # of unsupported tests          1

2021-04-22  Jakub Jelinek  <jakub@redhat.com>

	PR target/100182
	* testsuite/29_atomics/atomic_float/1.cc: Add dg-xfail-run-if for
	ia32.
	* testsuite/29_atomics/atomic_float/wait_notify.cc: Add dg-skip-if for
	ia32.

(cherry picked from commit 0f458814)

pr68078.f90 tests out-of-memory handling and calls set_vm_limit to set the
soft limit.  However, setrlimit was then called with hard limit RLIM_INFINITY,
which failed when the current hard limit was lower.

gcc/testsuite/
	* gfortran.dg/set_vm_limit.c (set_vm_limit): Call getrlimit, use
	obtained hard limit, and only call setrlimit if new softlimit is lower.

(cherry picked from commit faf7d413)

With -Werror=return-type we run into compile fails complaining about
missing return stmts.

2021-04-21  Richard Biener  <rguenther@suse.de>

	PR testsuite/100176
	* objc.dg/gnu-encoding/struct-layout-encoding-1_generate.c: Add
	missing return.

(cherry picked from commit 56688433)

libatomic isn't built for amdgcn but reduction-16.c adds it
via -foffload=-latomic when offloading for nvptx is enabled.
The following avoids linker errors when offloading to amdgcn is enabled
as well.

2021-04-21  Richard Biener  <rguenther@suse.de>

libgomp/
	* testsuite/libgomp.c-c++-common/reduction-16.c: Use -latomic
	only on nvptx-none.

(cherry picked from commit d42088e4)

A change was made to __atomic_semaphore::_S_do_try_acquire() to
(ideally) let the compare_exchange reload the value of __old rather than
always reloading it twice. This causes _M_acquire to spin indefinitely
if the value of __old is already 0.

libstdc++-v3/ChangeLog:
	* include/bits/semaphore_base.h: Always reload __old in
	__atomic_semaphore::_S_do_try_acquire().
	* testsuite/30_threads/stop_token/stop_callback/destroy.cc:
	re-enable testcase.

(cherry picked from commit 7eeb8c04)

libstdc++-v3/ChangeLog:
	* include/bits/semaphore_base.h: Add missing _M_try_acquire()
	member to __platform_wait.

(cherry picked from commit 5445da1a)

libstdc++-v3/ChangeLog:

	* include/std/latch: Replace tab characters in license text.
	* include/std/semaphore: Likewise.

(cherry picked from commit 88202c88)

libiberty/
	PR demangler/100177
	* rust-demangle.c (demangle_const_char): Properly print the
	character value.

With -Werror=return-type we run into compile fails complaining about
missing return stmts.

2021-04-21  Richard Biener  <rguenther@suse.de>

	PR testsuite/100176
	* g++.dg/compat/struct-layout-1_generate.c: Add missing return.
	* gcc.dg/compat/struct-layout-1_generate.c: Likewise.

(cherry picked from commit d8f95381)

gcc/ada/
	PR ada/99360
	* exp_ch6.adb (Might_Have_Tasks): Return False when the type is the
	class-wide type of a predefined iterator type.