Commit Graph

13 Commits

Author SHA1 Message Date
Joel Sherrill eae68bfc87 Add default implementation of fenv.h and all methods
The default implementation of the fenv.h methods return
	-EOPNOTSUP. Some of these have implementations appropriate
        for soft-float.

	The intention of the new fenv.h is that it be portable
	and that architectures provide their own implementation
	of sys/fenv.h.
2019-08-09 17:49:16 +02:00
Corinna Vinschen 40958b0d86 Cygwin: fenv.h: Add feature test macros, fix values
- feenableexcept,fedisableexcept, fegetexcept are GNU-only
- fegetprec, fesetprec are Solaris, use __MISC_VISIBLE
- _feinitialise is Cygwin-internal only
- Replace self-named FP precision values to values from
  http://www.open-std.org/jtc1/sc22//WG14/www/docs/n752.htm
  as used by Solaris.
- Change return value of fesetprec to adhere to the above document
  and Solaris.
- Document fegetprec, fesetprec as Solaris functions, not as GNU
  functions

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2019-03-01 21:08:44 +01:00
J.H. van de Water 4c4c19f548 Keep the denormal-operand exception masked; modify FE_ALL_EXCEPT accordingly.
By excluding the denormal-operand exception from FE_ALL_EXCEPT, it will not
be possible anymore to UNmask this exception by means of the API defined by
/usr/include/fenv.h

Note: terminology has changed since IEEE Std 854-1987; denormalized numbers
are called subnormal numbers nowadays.

This modification has basically been motivated by the fact that it is also
not possible on Linux to manipulate the denormal-operand exception by means
of the interface as defined by /usr/include/fenv.h. This has been the state
of affairs on Linux since 2001 (Andreas Jaeger).

The exceptions required by the standard (IEEE Std 754), in case they can be
supported by the implementation, are:
FE_INEXACT, FE_UNDERFLOW, FE_OVERFLOW, FE_DIVBYZERO and FE_INVALID.

Although it is allowed to define additional exceptions, there is no reason
to support the "denormal-operand exception" in this case (fenv.h), because
the subnormal numbers can be handled almost as fast the normalized numbers
by the hardware of the x86/x86_64 architecture. Said differently, a reason
to trap on the input of subnormal numbers does not exist. At least that is
what William Kahan and others at Intel asserted around 2000.
(that is William Kahan of the K-C-S draft, the precursor to the standard)

This commit modifies winsup/cygwin/include/fenv.h as follows:
 - redefines FE_ALL_EXCEPT from 0x3f to 0x3d
 - removes the definition for FE_DENORMAL
 - introduces __FE_DENORM (0x2) (enum in Linux also uses __FE_DENORM)
 - introduces FE_ALL_EXCEPT_X86 (0x3f), i.e. ALL x86/x86_64 FP exceptions
2018-08-15 18:02:22 +02:00
J.H. van de Water d79069d2ff Cygwin: fegetenv() should not disable exceptions
fnstenv MUST be followed by fldenv in fegetenv(), as the former disables all
exceptions in the x87 FPU, which is not appropriate here (fegetenv() ).
fldenv after fnstenv should reload the x87 FPU w/ the configuration that was
saved by fnstenv, i.e. a configuration that might have exceptions enabled.

Note: x86_64 uses SSE for floating-point, not the x87 FPU. However, because
feraiseexcept() attempts to provoke an exception using the x87 FPU, the bug
in fegetenv() will make this attempt futile here (x86_64).

Note: WoW uses the x87 FPU for floating-point, not SSE. Here anything that
would normally result in triggering an exception, not only feraiseexcept(),
will not be able to, as result of the bug in fegetenv().
2018-08-03 09:33:49 +02:00
Corinna Vinschen 6e623e9320 Switching the Cygwin DLL to LGPLv3+, dropping commercial buyout option
Bump GPLv2+ to GPLv3+ for some files, clarify BSD 2-clause.

Everything else stays under GPLv3+.

New Linking Exception exempts resulting executables from LGPLv3 section 4.

Add CONTRIBUTORS file to keep track of licensing.

Remove 'Copyright Red Hat Inc' comments.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2016-06-23 10:09:17 +02:00
Corinna Vinschen 279aaeb5c7 fenv.h: Change fexcept_t to integral type for compatibility
On Linux and in Mingw-w64, fexcept_t is defined as type unsigned short.
There are packages in the wild which rely on the fact that fexcept_t is
an integral type.  We're changing the internal handling to use the bits
just as in GLibc, so only the 6 lowest bits are used to reflect the hw
bits.  We even change the header file guard to reflect GLibc for compatibility.

	* include/fenv.h (_FENV_H): Rename from _FENV_H_ and set to 1 as in
	GLibc's header.
	(fexcept_t): Change to __uint16_t to be an integral type as in GLibc.
	* fenv.cc (fegetexceptflag): Align to the *flagp's type change.
	(fesetexceptflag): Ditto.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
2016-03-30 12:55:42 +02:00
Jon Turney e30d78d685 Remove spurious execute permissions from some Cygwin source and text files
2015-08-21  Jon Turney  <jon.turney@dronecode.org.uk>

	* cygwin-cxx.h: Remove execute permissions.
	* fenv.cc: Ditto.
	* how-startup-shutdown-works.txt: Ditto.
	* include/arpa/nameser.h: Ditto.
	* include/arpa/nameser_compat.h: Ditto.
	* include/fenv.h: Ditto.
	* include/resolv.h: Ditto.
	* libstdcxx_wrapper.cc: Ditto.

2015-10-27  Jon Turney  <jon.turney@dronecode.org.uk>

	* winsup.api/signal-into-win32-api.c: Remove execute permissions.

Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
2015-10-27 16:10:37 +00:00
Corinna Vinschen 61522196c7 * Merge in cygwin-64bit-branch. 2013-04-23 09:44:36 +00:00
Corinna Vinschen 6f5a3401aa * fenv.cc (fesetround): Fix test for valid input parameter.
(fesetprec): Ditto.
2012-05-02 07:42:08 +00:00
Christopher Faylor b86f999af1 whitespace elimination 2011-06-06 05:02:13 +00:00
Corinna Vinschen 6ce541281e Drop NT4 support.
* autoload.cc (DnsQuery_A): Fatal if not available.
	(DnsRecordListFree): Ditto.
	(DsGetDcNameW): Ditto.
	(NetGetAnyDCName): Remove.
	(NetGetDCName): Remove.
	(EnumProcessModules): Fatal if not available.
	(GetModuleFileNameExW): Ditto.
	(GetModuleInformation): Ditto.
	(GetProcessMemoryInfo): Ditto.
	(QueryWorkingSet): Ditto.
	(LsaRegisterLogonProcess): Ditto.
	* fenv.cc (_feinitialise): Drop supports_sse condition.
	* fhandler_disk_file.cc (path_conv::isgood_inode): Fix comment.
	(fhandler_base::fstat_by_name): Drop has_fileid_dirinfo condition.
	(fhandler_disk_file::opendir): Ditto.
	* fhandler_netdrive.cc (fhandler_netdrive::readdir): Fix comment.
	* fhandler_proc.cc (format_proc_partitions): Drop NT4-only code.
	* fhandler_process.cc (get_process_state): Ditto.
	* kernel32.cc (GetWindowsDirectoryW): Remove.
	(GetWindowsDirectoryA): Remove.
	* miscfuncs.cc (nice_to_winprio): Drop NT4-only code.
	* mount.cc (fs_info::update): Fix comments.
	* net.cc (get_2k_ifs): Drop NT4-only code.
	* sec_auth.cc (get_logon_server): Ditto.
	(lsaauth): Drop NT4-specific error handling.
	* security.cc (alloc_sd): Set SE_DACL_PROTECTED unconditionally.
	* select.cc (select_stuff::wait): Always use MWMO_INPUTAVAILABLE.
	(peek_windows): Drop NT4-only condition in call to PeekMessage.
	* syscalls.cc (gethostid): Remove NT4-only workaround.
	* wincap.cc: Througout, drop has_dacl_protect,
	has_broken_if_oper_status, has_process_io_counters,
	has_terminal_services, has_extended_priority_class, has_guid_volumes,
	has_fileid_dirinfo, has_mwmo_inputavailable and supports_sse from
	wincaps.
	(wincap_nt4sp4): Remove.
	(wincap_minimal): Set to wincap_2000.
	(wincapc::init): Rely on availability of OSVERSIONINFOEX structure.
	Treat error from GetVersionEx as fatal.  Treat NT4 as fatal.
	* wincap.h (struct wincaps): Drop has_dacl_protect,
	has_broken_if_oper_status, has_process_io_counters,
	has_terminal_services, has_extended_priority_class, has_guid_volumes,
	has_fileid_dirinfo, has_mwmo_inputavailable and supports_sse flags
	and methods.
	* winlean.h (GetWindowsDirectoryW) Define as GetSystemWindowsDirectoryW.
	(GetWindowsDirectoryA): Define as GetSystemWindowsDirectoryA.
2011-04-04 12:23:36 +00:00
Corinna Vinschen 33150e7f40 * fenv.cc (_feinitialise); Don't use SSE instructions on systems not
supporting them.
	* wincap.h (wincaps::supports_sse): New element.
	* wincap.cc: Implement above element throughout.
2011-03-20 15:34:29 +00:00
Dave Korn 0f81b5d4bc winsup/cygwin/ChangeLog:
* Makefile.in (DLL_OFILES): Add new fenv.o module.
	(fenv_CFLAGS): New flags definition for fenv.o compile.
	* autoload.cc (std_dll_init): Use fenv.h functions instead of direct
	manipulation of x87 FPU registers.
	* crt0.c (mainCRTStartup): Likewise.
	* cygwin.din (feclearexcept, fegetexceptflag, feraiseexcept,
	fesetexceptflag, fetestexcept, fegetround, fesetround, fegetenv,
	feholdexcept, fesetenv, feupdateenv, fegetprec, fesetprec,
	feenableexcept, fedisableexcept, fegetexcept, _feinitialise,
	_fe_dfl_env, _fe_nomask_env): Export new functions and data items.
	* fenv.cc: New file.
	* posix.sgml: Update status of newly-implemented APIs.
	* include/fenv.h: Likewise related header.
	* include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
2010-09-11 06:53:28 +00:00