This patch optimizes powerpc spinlock implementation by:
* Use the correct EH hint bit on the larx for supported ISA. For lock
acquisition, the thread that acquired the lock with a successful stcx
does not want to give away the write ownership on the cacheline. The
idea is to make the load reservation "sticky" about retaining write
authority to the line. That way, the store that must inevitably come
to release the lock can succeed quickly and not contend with other
threads issuing lwarx. If another thread does a store to the line
(false sharing), the winning thread must give up write authority to
the proper value of EH for the larx for a lock acquisition is 1.
* Increase contented lock performance by up to 40%, and no measurable
impact on uncontended locks on P8.
Thanks to Adhemerval Zanella who did most of the work. I've run some
tests, and addressed some minor feedback.
* sysdeps/powerpc/nptl/pthread_spin_lock.c (pthread_spin_lock):
Add lwarx hint, and use macro for acquire instruction.
* sysdeps/powerpc/nptl/pthread_spin_trylock.c (pthread_spin_trylock):
Likewise.
* sysdep/unix/sysv/linux/powerpc/pthread_spin_unlock.c: Move to ...
* sysdeps/powerpc/nptl/pthread_spin_unlock.c: ... here, and
update to use new atomic macros.
__lll_trylock_elision sets the adapt_count variable too
aggressively, and incorrectly on persistent aborts. Taking
a cue from s390, adapt_count is only updated if the lock
is locked, or a persistent failure occurs.
In addition, the abort codes have been renumbered and
refactored for clarity. As it stands, glibc only cares
if the abort is persistent or not.
All aborts are now persistent, excepting a busy lock. This
includes changing _ABORT_NESTED_TRYLOCK into a persistent
abort.
* sysdeps/unix/sysv/linux/powerpc/elision-trylock.c
(__lll_trylock_elision): Fix setting of adapt_count.
* sysdeps/unix/sysv/linux/powerpc/htm.h
(_ABORT_PERSISTENT): Define to clarify persistent aborts.
(_ABORT_NESTED_TRYLOCK): Renumber, and make persistent.
(_ABORT_SYSCALL): Renumber, and clarify definition.
(_ABORT_LOCK_BUSY): Renumber, make non-persistent.
Kind of hokey, but errno.h drags in misc/sys/param.h which
defines MIN/MAX causing an error. Include system headers
first to grab MIN/MAX definition in param.h, and define
HAVE_ALLOCA to preserve existing behavior.
* sysdeps/ieee754/ldbl-128ibm/mpn2ldl.c: Include gmp headers
after system headers to prevent MIN/MAX redefinition. Define
HAVE_ALLOCA to preserve builtin alloca usage.
Include the __sin and __cos functions as local static copies to allow
deper optimization of the functions. This change shows an improvement
of about 17% in the min case and 12.5% in the mean case for the sincos
microbenchmark on x86_64.
* sysdeps/ieee754/dbl-64/s_sin.c (__sin)[IN_SINCOS]: Mark function
static and don't set or restore rounding.
(__cos)[IN_SINCOS]: Likewise.
* sysdeps/ieee754/dbl-64/s_sincos.c: Include s_sin.c.
(__sincos): Set and restore rounding mode. Remove check for infinite
or NaN input.
Prevent function calls that don't return anything from being optimized
out by the compiler by marking its input variables as used.
This prevents the sincos function call from being optimized out in the
benchmark.
For ldbl-128ibm, if the result of strtold overflows in the final
conversion from MPN to IBM long double (because the exponent for a
106-bit IEEE result is 1023 but the high part would end up as
0x1p1024, which overflows), that conversion code fails to handle this
and produces an invalid long double value (high part infinite, low
part not zero) without raising exceptions or setting errno. This
patch adds an explicit check for this case to ensure an appropriate
result is returned in a way that ensures the right exceptions are
raised, with errno set.
Tested for powerpc.
[BZ #14551]
* sysdeps/ieee754/ldbl-128ibm/mpn2ldbl.c: Include <errno.h>.
(__mpn_construct_long_double): If high part overflows to infinity,
set errno and recompute overflowed result of the correct sign.
* sysdeps/ieee754/ldbl-128ibm/Makefile
[$(subdir) = stdlib] (tests): Add tst-strtold-ldbl-128ibm.
[$(subdir) = stdlib] ($(objpfx)tst-strtold-ldbl-128ibm): Depend on
$(libm).
* sysdeps/ieee754/ldbl-128ibm/tst-strtold-ldbl-128ibm.c: New file.
The powerpc hard-float round and roundf functions, both 32-bit and
64-bit, raise spurious "inexact" exceptions for integer arguments from
adding 0.5 and rounding to integer toward zero.
Since these functions already save and restore the rounding mode, it's
natural to make them restore the full floating-point state instead to
fix this bug, which this patch does. The save of the state is moved
after the first floating-point operation on the input so that any
"invalid" exceptions from signaling NaN inputs are properly
preserved. As a consequence of this approach to the fix, "inexact"
for noninteger arguments (disallowed by TS 18661-1 but not by C99/C11,
see bug 15479) is also avoided for these implementations; this is
*not* a general fix for bug 15479 since plenty of other
implementations of various functions still raise spurious "inexact"
for noninteger arguments.
This issue and fix do not apply to builds using power5+ versions of
round and roundf, which use the frin instruction and avoid "inexact"
exceptions that way.
This patch should get hard-float powerpc32 and powerpc64 (default
function implementations) back to a state where test-float and
test-double will pass after ulps regeneration.
Tested for powerpc32 and powerpc64.
[BZ #15479]
[BZ #19238]
* sysdeps/powerpc/powerpc32/fpu/s_round.S (__round): Save
floating-point state after first operation on input. Restore full
state rather than just rounding mode.
* sysdeps/powerpc/powerpc32/fpu/s_roundf.S (__roundf): Likewise.
* sysdeps/powerpc/powerpc64/fpu/s_round.S (__round): Likewise.
* sysdeps/powerpc/powerpc64/fpu/s_roundf.S (__roundf): Likewise.
Similar to bug 19134 for powerpc32, the powerpc64 implementations of
lround, lroundf, llround, llroundf can raise spurious "inexact"
exceptions for integer arguments from adding 0.5 then converting to
integer (this does not apply to the power5+ version for double, which
uses the frin instruction which is defined never to raise "inexact"; I
don't know why power5+ doesn't use that version for float as well).
This patch fixes the bug in a similar way to the powerpc32 bug, by
testing for integers (adding and subtracting 2^52 and comparing with
the value before that addition and subtraction) and not adding 0.5 in
that case.
The powerpc maintainers may wish to look at making power5+ / power6x /
power8 use frin for float lround / llround as well as for double,
unless there's some reason I've missed that this isn't beneficial.
Tested for powerpc64.
[BZ #19235]
* sysdeps/powerpc/powerpc64/fpu/s_llround.S (__llround): Do not
add 0.5 to integer arguments.
* sysdeps/powerpc/powerpc64/fpu/s_llroundf.S (__llroundf):
Likewise.
(.LC2): New object.
Similar to bug 15491 recently fixed for x86_64 / x86, the powerpc
(both powerpc32 and powerpc64) hard-float implementations of
nearbyintf and nearbyint wrongly clear an "inexact" exception that was
raised before the function was called; this shows up as failure of the
test math/test-nearbyint-except added when that bug was fixed. They
also wrongly leave traps on "inexact" disabled if they were enabled
before the function was called.
This patch fixes the bugs similar to how the x86 bug was fixed: saving
and restoring the whole floating-point state, both to restore the
original "inexact" flag state and to restore the original state of
whether traps on "inexact" were enabled. Because there's a convenient
point in the powerpc implementations to save state after any sNaN
arguments will have raised "invalid" but before "inexact" traps need
to be disabled, no special handling for "invalid" is needed as in the
x86 version.
Tested for powerpc64 and powerpc32, where it fixes the
math/test-nearbyint-except failure as well as fixing the new test
math/test-nearbyint-except-2 added by this patch. Also tested for
x86_64 and x86 that the new test passes.
If powerpc experts see a more efficient way of doing this
(e.g. instruction positioning that's better for pipelines on typical
processors) then of course followups optimizing the fix are welcome.
[BZ #19228]
* sysdeps/powerpc/powerpc32/fpu/s_nearbyint.S (__nearbyint): Save
and restore full floating-point state.
* sysdeps/powerpc/powerpc32/fpu/s_nearbyintf.S (__nearbyintf):
Likewise.
* sysdeps/powerpc/powerpc64/fpu/s_nearbyint.S (__nearbyint):
Likewise.
* sysdeps/powerpc/powerpc64/fpu/s_nearbyintf.S (__nearbyintf):
Likewise.
* math/test-nearbyint-except-2.c: New file.
* math/Makefile (tests): Add test-nearbyint-except-2.
This test applies to i386 and x86_64 which set R_386_GLOB_DAT and
R_X86_64_GLOB_DAT to ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA.
[BZ #19178]
* sysdeps/x86/Makefile (tests): Add tst-prelink.
(tst-prelink-ENV): New.
($(objpfx)tst-prelink-conflict.out): Likewise.
($(objpfx)tst-prelink-cmp.out): Likewise.
(tests-special): Add $(objpfx)tst-prelink-cmp.out.
* sysdeps/x86/tst-prelink.c: New file.
* sysdeps/x86/tst-prelink.exp: Likewise.
Prompted by a gcc-patches discussion, this patch adds tests of pow for
the cases where pow (x, 0.5) is required to return a different result
from sqrt (x), as those cases were previously missing from the tests
(although they worked correctly).
Tested for x86_64 and x86.
* math/auto-libm-test-in: Add another test of pow.
* math/auto-libm-test-out: Regenerated.
* math/libm-test.inc (pow_test_data): Add another test.
GLIBC fails to build for ia64 since commit d0d286d32d.
It is because this commit uses the internal definition for nearbyintl,
but ia64 specialized implementation (sysdeps/ia64/fpu/s_nearbyintl.S)
does not define it.
Tested with a ia64 build.
[BZ #19219]
* sysdeps/ia64/fpu/s_nearbyintl.S (__nearbyint): Define and
weak_alias to nearbyintl.
* elf/dl-load.c (_dl_map_object_from_fd): Add additional parameter
for original name of the DSO. Add it to the name list of the DSO
if it is actually given.
(_dl_map_object): Keep track of whether an audit module rewrote
the file name. If yes, pass the original name to
_dl_map_object_from_fd in a new parameter, otherwise NULL. When
debugging is enabled, log the change of the file name.
* sysdeps/mach/hur/dl-sysdep.c: Adjust commented-out call to
_dl_map_object_from_fd.
* elf/Makefile: Build and run tst-audit11 and tst-audit12.
* elf/tst-audit11.c: New file
* elf/tst-auditmod11.c: New file.
* elf/tst-audit11mod1.c: New file.
* elf/tst-audit11mod2.c: New file.
* elf/tst-audit11mod2.map: New file.
* elf/tst-audit12.c: New file
* elf/tst-auditmod12.c: New file.
* elf/tst-audit12mod1.c: New file.
* elf/tst-audit12mod2.c: New file.
* elf/tst-audit12mod2.map: New file.
* elf/tst-audit12mod3.c: New file.
For each function setjmp, longjmp, getcontext, there exist a symbol
<func> and a default/versioned symbol <func>@@GLIBC_2.x in the build
obj-files.
This is wrong because it should only exist an unversioned or a
default-versioned symbol with the same name in an obj-file.
Glibc can't be build with recent binutils. See the already fixed linker
bug https://sourceware.org/bugzilla/show_bug.cgi?id=19073.
Nevertheless, this patch cleans this up.
Furthermore the BSD entry points setjmp, _setjmp were marked as weak,
but should be strong as on other architectures.
(see https://sourceware.org/ml/libc-alpha/2014-07/msg00568.html for an
older discussion with Andreas Schwab)
Some whitespace issues are corrected in sysdeps/s390/s390-64/setjmp.S,
too. But there is no change in the assembler code.
ChangeLog:
* sysdeps/s390/longjmp.c (longjmp, _longjmp, siglongjmp):
Don't create weak aliases,
because versioned symbols are created later.
* sysdeps/s390/s390-32/setjmp.S
(setjmp, _setjmp): Remove weak and rename to an unique name
in SHARED case due to existing versioned symbols.
* sysdeps/s390/s390-64/setjmp.S: Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/getcontext.S
(getcontext): Create weak alias only in non SHARED case.
* sysdeps/unix/sysv/linux/s390/s390-64/getcontext.S: Likewise.
this patch calls direct system calls for socket operations in the same way as power does. The system calls were introduced in kernel commit https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=977108f89c989b1eeb5c8d938e1e71913391eb5f.
There are no direct recv, send, accept syscalls available on s390. Thus
recvfrom, sendto, accept4 are called instead of the socketcall by defining __ASSUME_*_FOR_*_SYSCALL macros. See recv.c, send.c, accept.c in sysdeps/unix/sysv/linux/ folder.
The socketcalls in syscalls.list for s390-64 are removed. They were never used on s390x.
ChangeLog:
* sysdeps/unix/sysv/linux/s390/kernel-features.h:
(__ASSUME_*_SYSCALL) Define new macros.
* sysdeps/unix/sysv/linux/s390/s390-64/syscalls.list:
Remove socketcall syscalls.
* sysdeps/unix/sysv/linux/accept.c (__libc_accept):
Use accept4 if defined __ASSUME_ACCEPT4_FOR_ACCEPT_SYSCALL.
* sysdeps/unix/sysv/linux/recv.c (__libc_recv):
Use recvfrom if defined __ASSUME_RECVFROM_FOR_RECV_SYSCALL.
* sysdeps/unix/sysv/linux/send.c (__libc_send):
Use sendto if defined __ASSUME_SENDTO_FOR_SEND_SYSCALL.
The recvmsg system calls for netlink sockets have been particularly
prone to picking up unrelated data after a file descriptor race
(where the descriptor is closed and reopened concurrently in a
multi-threaded process, as the result of a file descriptor
management issue elsewhere). This commit adds additional error
checking and aborts the process if a datagram of unexpected length
(without the netlink header) is received, or an error code which
cannot happen due to the way the netlink socket is used.
[BZ #12926]
Terminate process on invalid netlink response.
* sysdeps/unix/sysv/linux/netlinkaccess.h
(__netlink_assert_response): Declare.
* sysdeps/unix/sysv/linux/netlink_assert_response.c: New file.
* sysdeps/unix/sysv/linux/Makefile [$(subdir) == inet]
(sysdep_routines): Add netlink_assert_response.
* sysdeps/unix/sysv/linux/check_native.c (__check_native): Call
__netlink_assert_response.
* sysdeps/unix/sysv/linux/check_pf.c (make_request): Likewise.
* sysdeps/unix/sysv/linux/ifaddrs.c (__netlink_request): Likewise.
* sysdeps/unix/sysv/linux/Versions (GLIBC_PRIVATE): Add
__netlink_assert_response.
prelink runs ld.so with the environment variable LD_TRACE_PRELINKING
set to dump the relocation type class from _dl_debug_bindings. prelink
has the following relocation type classes:
#define RTYPE_CLASS_VALID 8
#define RTYPE_CLASS_PLT (8|1)
#define RTYPE_CLASS_COPY (8|2)
#define RTYPE_CLASS_TLS (8|4)
where ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA has a conflict with
RTYPE_CLASS_TLS.
Since prelink only uses ELF_RTYPE_CLASS_PLT and ELF_RTYPE_CLASS_COPY
bits, we should clear the other bits when the DL_DEBUG_PRELINK bit is
set.
[BZ #19178]
* elf/dl-lookup.c (RTYPE_CLASS_VALID): New.
(RTYPE_CLASS_PLT): Likewise.
(RTYPE_CLASS_COPY): Likewise.
(RTYPE_CLASS_TLS): Likewise.
(_dl_debug_bindings): Use RTYPE_CLASS_TLS and RTYPE_CLASS_VALID
to set relocation type class for DL_DEBUG_PRELINK. Keep only
ELF_RTYPE_CLASS_PLT and ELF_RTYPE_CLASS_COPY bits for
DL_DEBUG_PRELINK.
I noticed a typo in the messages from the signgam tests I recently
added. This patch fixes it.
Tested for x86_64 and x86.
* math/test-signgam-finite.c (RUN_TESTS): Correct messages about
calls with argument -0.5.
* math/test-signgam-finite-c99.c (RUN_TESTS): Likewise.
There are configure tests for the linker -z nodelete, -z nodlopen and
-z initfirst options. These options were added in binutils 2.11, so
the tests are obsolete; this patch removes them.
Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).
* configure.ac (libc_cv_z_nodelete): Remove configure test.
(libc_cv_z_nodlopen): Likewise.
(libc_cv_z_initfirst): Likewise.
* configure: Regenerated.
The new format lists the version on each line, as in:
VERSION SYMBOL TYPE [VALUE]
This makes it easier to process the files with line-oriented tools.
The abilist files were converted with this awk script:
/^[^ ]/ { version = $1 }
/^ / { print version, substr($0, 2) }
And sorted under the "C" locale with sort.
This patch arranges for the libm-test tests to be run for the
finite-math-only function variants, in addition to the existing runs
for out-of-line and bits/mathinline.h inline variants.
gen-libm-test.pl is made to add a flag to all tests with non-finite
inputs or outputs so that they can be skipped at runtime when the
finite-math-only variants are being tested (skipping is for all
rounding modes; that is, -ffinite-math-only is being treated as
excluding overflow cases even when the rounding mode is such that the
overflowed result is finite). errno setting is not tested for these
variants (in general they don't set it, and it's
implementation-defined in ISO C whether it's set on underflow, with
the glibc definition being that it may not be for -ffinite-math-only;
other cases where errno would normally be expected to be set are
mostly excluded as having non-finite or overflowing arguments or
results).
As with the inline function tests, these ones are built with
-D__FINITE_MATH_ONLY=1 to select the function variants, rather than
-ffinite-math-only. Use of -ffinite-math-only would not be suitable
for these tests because it would also affect libm-test.inc code that
e.g. tests whether results are infinities or NaNs - if these function
variants have bugs that incorrectly produce such results, we want them
to show up in the tests, which means the compiler should not be
optimizing the tests on the basis of results being finite.
The finite-math-only functions share the same ulps settings as the
main out-of-line functions.
These interfaces were one significant group of untested ABIs listed at
<https://sourceware.org/ml/libc-alpha/2013-07/msg00386.html>. I
haven't rerun the script to list untested interfaces, but I expect
that the vast bulk of interfaces there are still untested and could do
with testcases being added (or, if applicable, being made compat
symbols; in general, most symbols not starting '_' are safe bets to
add tests for, while _* need more investigation of what the actual
public API is, if any). I'd like to encourage people to help reduce
the accumulation of untested interfaces by adding more tests.
Tested for x86_64 and x86. Given my recent lgamma/gamma and log*
fixes, the new tests pass (before those fixes, the new tests showed up
those bugs, so illustrating the practical utility of having tests for
these function variants).
* math/libm-test.inc (NON_FINITE): New macro.
(enable_test): Do not run tests flagged NON_FINITE if TEST_FINITE.
* math/gen-libm-test.pl (show_exceptions): Add argument
$non_finite.
(parse_args): Update call to show_exceptions.
* math/test-math-finite.h: New file.
* math/test-math-no-finite.h: Likewise.
* math/test-double-finite.c: Likewise.
* math/test-float-finite.c: Likewise.
* math/test-ldouble-finite.c: Likewise.
* math/test-double.c: Include "test-math-no-finite.h".
* math/test-float.c: Include "test-math-no-finite.h".
* math/test-ldouble.c: Include "test-math-no-finite.h".
* math/test-math-inline.h (TEST_FINITE): New macro.
* math/test-math-vector.h (TEST_FINITE): Likewise.
* math/Makefile (test-longdouble-yes): Add test-ldouble-finite.
(libm-tests): Add test-float-finite and test-double-finite.
($(objpfx)test-float-finite.o): New dependency on
$(objpfx)libm-test.stmp.
($(objpfx)test-double-finite.o): Likewise.
($(objpfx)test-ldouble-finite.o): Likewise.
(libm-test-no-inline-cflags): New variable.
(libm-test-finite-cflags): Likewise.
(CFLAGS-test-float-finite.c): Likewise.
(CFLAGS-test-double-finite.c): Likewise.
(CFLAGS-test-ldouble-finite.c): Likewise.
(CFLAGS-test-float.c): Use $(libm-test-no-inline-cflags).
(CFLAGS-test-double.c): Likewise.
(CFLAGS-test-ldouble.c): Likewise.
For the -ffinite-math-only versions of various x86_64 and x86 log*
functions, a zero result from log* (1) is returned with incorrect sign
in round-downward mode. This patch fixes this in a similar way to the
previous fixes for the non-*_finite versions of the functions.
Tested for x86_64 and x86 (including an i586 build), together with a
patch that will be applied separately to enable the main libm-test.inc
tests for the finite-math-only functions.
[BZ #19213]
* sysdeps/i386/fpu/e_log.S (__log_finite): Ensure +0 is always
returned for argument 1.
* sysdeps/i386/fpu/e_logf.S (__logf_finite): Likewise.
* sysdeps/i386/fpu/e_logl.S (__logl_finite): Likewise.
* sysdeps/i386/i686/fpu/e_logl.S (__logl_finite): Likewise.
* sysdeps/x86_64/fpu/e_log10l.S (__log10l_finite): Likewise.
* sysdeps/x86_64/fpu/e_log2l.S (__log2l_finite): Likewise.
* sysdeps/x86_64/fpu/e_logl.S (__logl_finite): Likewise.
The lgamma inline functions in bits/math-finite.h do not set signgam
if __USE_ISOC99, even when other feature test macros mean a standard
such as XSI POSIX is selected for which it should be set. (This is
essentially the opposite issue to bug 15421, the out-of-line versions
setting signgam even when they shouldn't.)
This patch fixes those functions to use __USE_MISC || __USE_XOPEN as
the condition for when to set signgam, since it's the condition for
when math.h declares signgam. The legacy gamma* names are only
declared at all if __USE_MISC || __USE_XOPEN, so they just set signgam
unconditionally.
Tests for certain standards or not using _GNU_SOURCE cannot use
test-skeleton.c (this is a known issue noted on the wiki todo list).
Thus, the new tests that signgam remains not set in ISO C modes do not
use test-skeleton.c. They also define _ISOMAC to avoid running into
declarations in the internal include/ headers that only work in
_GNU_SOURCE mode.
Tested for x86_64 and x86.
[BZ #19211]
* math/bits/math-finite.h (lgamma): Set signgam if [__USE_MISC ||
__USE_XOPEN], not if [!__USE_ISOC99].
(lgammaf): Likewise.
(lgammal): Likewise.
(gamma): Set signgam unconditionally, not if [!__USE_ISOC99].
(gammaf): Likewise.
(gammal): Likewise.
* math/test-signgam-finite-c11.c: New file.
* math/test-signgam-finite-c99.c: Likewise.
* math/test-signgam-finite.c: Likewise.
* math/Makefile (tests): Add test-signgam-finite,
test-signgam-finite-c99 and test-signgam-finite-c11.
(CFLAGS-test-signgam-finite.c): New variable.
(CFLAGS-test-signgam-finite-c99.c): Likewise.
(CFLAGS-test-signgam-finite-c11.c): Likewise.
features.h is not clean with -Wundef (for the installed header, of
course this only appears with -Wsystem-headers). In ISO C standards
modes, you get a series of warnings / errors relating to
_POSIX_C_SOURCE and _XOPEN_SOURCE not being defined when tested in
standards mode and uses #undef _GNU_SOURCE to avoid the default
_GNU_SOURCE from libc-symbols.h. This patch changes the relevant #if
conditionals to avoid these warnings / errors.
Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).
[BZ #19212]
* include/features.h [(_XOPEN_SOURCE - 0) >= 500]: Change
conditional to [defined _XOPEN_SOURCE && (_XOPEN_SOURCE - 0) >=
500].
[_POSIX_C_SOURCE >= 1]: Change conditional to [defined
_POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1].
[(_POSIX_C_SOURCE - 0) >= 199309L]: Change conditional to [defined
_POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199309L].
[(_POSIX_C_SOURCE - 0) >= 199506L]: Change conditional to [defined
_POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 199506L].
[(_POSIX_C_SOURCE - 0) >= 200112L]: Change conditional to [defined
_POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200112L].
[(_POSIX_C_SOURCE - 0) >= 200809L]: Change conditional to [defined
_POSIX_C_SOURCE && (_POSIX_C_SOURCE - 0) >= 200809L].
bits/math-finite.h maps ldexp functions to corresponding scalbn
functions. This is (a) a namespace bug for C90, which has ldexp but
not scalbn, and (b) in any case useless, since the ldexp and scalbn
functions have identical semantics (for floating-point types with
radix 2), and since the fix for bug 6803 are actually aliases
(presumably the mapping was based around the old bug of scalbn not
setting errno). This patch removes the bogus redirections.
Tested for x86_64 and x86.
[BZ #19209]
* math/bits/math-finite.h (ldexp): Remove declaration.
(ldexpf): Likewise.
(ldexpl): Likewise.
bits/math-finite.h declares -ffinite-math-only variants of various
functions under conditions not matching those under which the normal
versions are declared.
* math.h only ever includes bits/mathcalls.h to declare float and long
double functions if __USE_ISOC99, but bits/math-finite.h declares
some float functions regardless (long double ones are conditioned on
__MATH_DECLARE_LDOUBLE). (For C90 functions this isn't a
conformance bug because C90 reserves the float and long double
names, but is still contrary to good glibc practice. For some other
functions in older XSI standards it *is* a conformance bug.)
* Some functions are defined as inlines using lgamma_r functions under
conditions where those lgamma_r functions are not themselves
declared.
* hypot is declared under __USE_XOPEN || __USE_ISOC99 in
bits/mathcalls.h, __USE_ISOC99 only in bits/math-finite.h.
* float and long double versions of Bessel functions should be limited
to __USE_MISC (as in bug 18977).
* gamma should not be declared for __USE_XOPEN2K (as in bug 18967).
* remainder should be restricted to __USE_XOPEN_EXTENDED ||
__USE_ISOC99, not unconditional.
* scalb should not be declared for __USE_XOPEN2K8, and scalbf and
scalbl are non-POSIX (as in bug 18967).
This patch fixes all these issues (it doesn't seem worth splitting
them into separate patches or bugs). I put __USE_ISOC99 conditionals,
where needed, around both float and long double declarations, even
though formally redundant around the long double declarations because
__MATH_DECLARE_LDOUBLE isn't defined without __USE_ISOC99; it seemed
clearer that way. The missing declarations of lgamma_r functions are
dealt with by directly using declarations of __lgamma*_r_finite, in
the implementation namespace, rather than having the inlines rely on
asm redirection of lgamma*_r.
After this patch, there are some apparently redundant nested
__USE_ISOC99 conditionals in lgamma / gamma definitions. These
actually reflect a separate bug (the correct condition for the lgamma
inline functions to set signgam is __USE_MISC || __USE_XOPEN, the
condition under which signgam is declared, rather than disabling
setting it if __USE_ISOC99, which includes XSI POSIX versions for
which signgam *should* be set). They'll be fixed as part of a fix for
that bug, which will also add tests for these inlines. I've put a
note about more general conform/ test coverage for -ffinite-math-only
on
<https://sourceware.org/glibc/wiki/Development_Todo/Master#conformtest_improvements>,
alongside other options for which this is also relevant (some of which
have also had such bugs in the past relating to mismatched
conditionals).
I also intend to enable the main libm-test.inc tests for the
math-finite.h functions, but some other bugs in __*_finite need fixing
first.
[BZ #19205]
* math/bits/math-finite.h (acosf): Condition declaration on
[__USE_ISOC99].
(acosl): Likewise.
(acoshf): Likewise.
(acoshl): Likewise.
(asinf): Likewise.
(asinl): Likewise.
(atan2f): Likewise.
(atan2l): Likewise.
(atanhf): Likewise.
(atanhl): Likewise.
(coshf): Likewise.
(coshl): Likewise.
(expf): Likewise.
(expl): Likewise.
(fmodf): Likewise.
(fmodl): Likewise.
(hypot): Change condition to [__USE_XOPEN || __USE_ISOC99].
(j0f): Change condition to [__USE_MISC && __USE_ISOC99].
(j0l): Likewise.
(y0f): Likewise.
(y0l): Likewise.
(j1f): Likewise.
(j1l): Likewise.
(y1f): Likewise.
(y1l): Likewise.
(jnf): Likewise.
(jnl): Likewise.
(ynf): Likewise.
(ynl): Likewise.
(lgammaf_r): Condition declaration on [__USE_ISOC99].
(lgammal_r): Likewise.
(__lgamma_r_finite): New declaration.
(__lgammaf_r_finite): Likewise.
(__lgammal_r_finite): Likewise.
(lgamma): Use __lgamma_r_finite.
(lgammaf): Condition definition on [__USE_ISOC99]. Use
__lgammaf_r_finite.
(lgammal): Condition definition on [__USE_ISOC99]. Use
__lgammal_r_finite.
(gamma): Do not define for [!__USE_MISC && __USE_XOPEN2K]. Use
__lgamma_r_finite.
(gammaf): Condition definition on [__USE_ISOC99]. Use
__lgammaf_r_finite.
(gammal): Condition definition on [__USE_ISOC99]. Use
__lgammal_r_finite.
(logf): Condition declaration on [__USE_ISOC99].
(logl): Likewise.
(log10f): Likewise.
(log10l): Likewise.
(ldexpf): Likewise.
(ldexpl): Likewise.
(powf): Likewise.
(powl): Likewise.
(remainder): Condition declaration on [__USE_XOPEN_EXTENDED ||
__USE_ISOC99].
(remainderf): Condition declaration on [__USE_ISOC99].
(remainderl): Likewise.
(scalb): Do not declare for [!__USE_MISC && __USE_XOPEN2K8].
(scalbf): Change condition to [__USE_MISC && __USE_ISOC99].
(scalbl): Likewise.
(sinhf): Condition declaration on [__USE_ISOC99].
(sinhl): Likewise.
(sqrtf): Likewise.
(sqrtl): Likewise.
This patch refactors how libm-test.inc handles disabling
errno/exception handling tests, and some other tests, for
__FAST_MATH__ inline function tests.
The macro TEST_INLINE is changed from being defined/undefined to being
defined to 1 or 0, so that it can be tested in "if" conditionals
instead of #if. For tests of errno and exception setting, separate
macros TEST_ERRNO and TEST_EXCEPTIONS are added, and TEST_ERRNO is
also used in the disabling of errno testing for vector function
tests. The relevant conditionals are moved up a function, so that
they take effect before the code that counts the number of tests, so
the inline function tests now accurately report that 0 tests for
exceptions and errno were executed (whereas they previously reported a
large number desipte not running any such tests).
Tested for x86_64 and x86.
* math/test-math-errno.h: New file.
* math/test-math-inline.h (TEST_INLINE): Define to 1 instead of
empty.
(TEST_ERRNO): New macro.
(TEST_EXCEPTIONS): Likewise.
* math/test-math-no-inline.h (TEST_INLINE): Likewise.
(TEST_EXCEPTIONS): Likewise.
* math/test-math-vector.h (TEST_ERRNO): Likewise.
* math/test-double.c: Include "test-math-errno.h".
* math/test-float.c: Likewise.
* math/test-ldouble.c: Likewise.
* math/libm-test.inc (test_single_exception) [!TEST_INLINE]: Make
code unconditional.
(test_exceptions): Only run code if TEST_EXCEPTIONS.
(test_single_errno) [!TEST_INLINE && !TEST_MATHVEC]: Make code
unconditional.
(test_errno): Only run code if TEST_ERRNO.
(enable_test): Use "if" conditional on TEST_INLINE, not #ifdef.
There is a configure test for the --no-whole-archive linker option.
This option was added in binutils 2.7, so the test is obsolete; this
patch removes it.
Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).
* configure.ac (libc_cv_ld_no_whole_archive): Remove configure
test.
* configure: Regenerated.
This patch improves the libm test coverage for a few more functions.
Tested for x86_64 and x86.
* math/libm-test.inc (modf_test_data): Add more tests.
(nearbyint_test_data): Likewise.
(nextafter_test_data): Likewise.
(nexttoward_test_data): Likewise.
(pow_test_data): Likewise.
(remainder_test_data): Likewise.
(remquo_test_data): Likewise.
(rint_test_data): Likewise.
For some large arguments, the dbl-64 implementation of remainder gives
zero results with the wrong sign, resulting from a subtraction that is
mathematically correct but does not guarantee that a zero result has
the sign of the first argument to remainder. This patch adds an
appropriate check for this case, similar to other implementations of
remainder in the case of equality, and adds tests of remainder on
inputs already used to test remquo.
Tested for x86_64 and x86.
[BZ #19201]
* sysdeps/ieee754/dbl-64/e_remainder.c (__ieee754_remainder):
Check for zero remainder in case of large exponents and ensure
correct sign of result in that case.
* math/libm-test.inc (remainder_test_data): Add more tests.
nextafter and nexttoward fail to set errno on overflow and underflow.
This patch makes them do so in cases that should include all the cases
where such errno setting is required by glibc's goals for when to set
errno (but not all cases of underflow where the result is nonzero and
so glibc's goals do not require errno setting).
Tested for x86_64, x86, mips64 and powerpc.
[BZ #6799]
* math/s_nextafter.c: Include <errno.h>.
(__nextafter): Set errno on overflow and underflow.
* math/s_nexttowardf.c: Include <errno.h>.
(__nexttowardf): Set errno on overflow and underflow.
* sysdeps/i386/fpu/s_nextafterl.c: Include <errno.h>.
(__nextafterl): Set errno on overflow and underflow.
* sysdeps/i386/fpu/s_nexttoward.c: Include <errno.h>.
(__nexttoward): Set errno on overflow and underflow.
* sysdeps/i386/fpu/s_nexttowardf.c: Include <errno.h>.
(__nexttowardf): Set errno on overflow and underflow.
* sysdeps/ieee754/flt-32/s_nextafterf.c: Include <errno.h>.
(__nextafterf): Set errno on overflow and underflow.
* sysdeps/ieee754/ldbl-128/s_nextafterl.c: Include <errno.h>.
(__nextafterl): Set errno on overflow and underflow.
* sysdeps/ieee754/ldbl-128/s_nexttoward.c: Include <errno.h>.
(__nexttoward): Set errno on overflow and underflow.
* sysdeps/ieee754/ldbl-128/s_nexttowardf.c: Include <errno.h>.
(__nexttowardf): Set errno on overflow and underflow.
* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c: Include <errno.h>.
(__nextafterl): Set errno on overflow and underflow.
* sysdeps/ieee754/ldbl-128ibm/s_nexttoward.c: Include <errno.h>.
(__nexttoward): Set errno on overflow and underflow.
* sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c: Include <errno.h>.
(__nexttowardf): Set errno on overflow and underflow.
* sysdeps/ieee754/ldbl-96/s_nexttoward.c: Include <errno.h>.
(__nexttoward): Set errno on overflow and underflow.
* sysdeps/ieee754/ldbl-96/s_nexttowardf.c: Include <errno.h>.
(__nexttowardf): Set errno on overflow and underflow.
* sysdeps/ieee754/ldbl-opt/s_nexttowardfd.c: Include <errno.h>.
(__nldbl_nexttowardf): Set errno on overflow and underflow.
* sysdeps/m68k/m680x0/fpu/s_nextafterl.c: Include <errno.h>.
(__nextafterl): Set errno on overflow and underflow.
* math/libm-test.inc (nextafter_test_data): Do not allow errno
setting to be missing on overflow. Add more tests.
(nexttoward_test_data): Likewise.
There is a configure test "for .preinit_array/.init_array/.fini_array
support". Support for this feature was added in binutils 2.13, so the
configure test is obsolete; this patch removes it.
Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).
* configure.ac (libc_cv_initfini_array): Remove configure test.
* configure: Regenerated.
The ldbl-128 version of log1pl raises a spurious "invalid" exception
for a -qNaN argument. This patch fixes this by making the initial
check for infinities and NaNs handle arguments of both signs in such a
way that NaNs result in a NaN being returned (quietly if the input NaN
was quiet) while +Inf results in +Inf being returned and -Inf results
in a qNaN being returned with "invalid" exception raised.
Tested for mips64.
[BZ #19189]
* sysdeps/ieee754/ldbl-128/s_log1pl.c (__log1pl): Make check for
non-finite argument handle arguments with negative sign.
When Bessel functions return a zero result from an infinite argument,
the function oscillates as it approaches 0, so the sign of that zero
result should be indeterminate. This patch weakens the expectations
accordingly not to check the sign of such results (the tests were
causing spurious failures for j1 (-Inf) for ldbl-128).
Tested for x86_64 and x86.
* math/libm-test.inc (j0_test_data): Do not test sign of zero
result from infinite argument.
(j1_test_data): Likewise.
(jn_test_data): Likewise.
(y0_test_data): Likewise.
(y1_test_data): Likewise.
(yn_test_data): Likewise.
