Add femode_t functions.

TS 18661-1 defines a type femode_t to represent the set of dynamic
floating-point control modes (such as the rounding mode and trap
enablement modes), and functions fegetmode and fesetmode to manipulate
those modes (without affecting other state such as the raised
exception flags) and a corresponding macro FE_DFL_MODE.

This patch series implements those interfaces for glibc.  This first
patch adds the architecture-independent pieces, the x86 and x86_64
implementations, and the <bits/fenv.h> and ABI baseline updates for
all architectures so glibc keeps building and passing the ABI tests on
all architectures.  Subsequent patches add the fegetmode and fesetmode
implementations for other architectures.

femode_t is generally an integer type - the same type as fenv_t, or as
the single element of fenv_t where fenv_t is a structure containing a
single integer (or the single relevant element, where it has elements
for both status and control registers) - except where architecture
properties or consistency with the fenv_t implementation indicate
otherwise.  FE_DFL_MODE follows FE_DFL_ENV in whether it's a magic
pointer value (-1 cast to const femode_t *), a value that can be
distinguished from valid pointers by its high bits but otherwise
contains a representation of the desired register contents, or a
pointer to a constant variable (the powerpc case; __fe_dfl_mode is
added as an exported constant object, an alias to __fe_dfl_env).

Note that where architectures (that share a register between control
and status bits) gain definitions of new floating-point control or
status bits in future, the implementations of fesetmode for those
architectures may need updating (depending on whether the new bits are
control or status bits and what the implementation does with
previously unknown bits), just like existing implementations of
<fenv.h> functions that take care not to touch reserved bits may need
updating when the set of reserved bits changes.  (As any new bits are
outside the scope of ISO C, that's just a quality-of-implementation
issue for supporting them, not a conformance issue.)

As with fenv_t, femode_t should properly include any software DFP
rounding mode (and for both fenv_t and femode_t I'd consider that
fragment of DFP support appropriate for inclusion in glibc even in the
absence of the rest of libdfp; hardware DFP rounding modes should
already be included if the definitions of which bits are status /
control bits are correct).

Tested for x86_64, x86, mips64 (hard float, and soft float to test the
fallback version), arm (hard float) and powerpc (hard float, soft
float and e500).  Other architecture versions are untested.

	* math/fegetmode.c: New file.
	* math/fesetmode.c: Likewise.
	* sysdeps/i386/fpu/fegetmode.c: Likewise.
	* sysdeps/i386/fpu/fesetmode.c: Likewise.
	* sysdeps/x86_64/fpu/fegetmode.c: Likewise.
	* sysdeps/x86_64/fpu/fesetmode.c: Likewise.
	* math/fenv.h: Update comment on inclusion of <bits/fenv.h>.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (fegetmode): New function
	declaration.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (fesetmode): Likewise.
	* bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)] (femode_t): New
	typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/aarch64/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/alpha/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/arm/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/hppa/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/ia64/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/m68k/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/microblaze/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/mips/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/nios2/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/powerpc/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (__fe_dfl_mode): New variable
	declaration.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/s390/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/sh/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/sparc/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/tile/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* sysdeps/x86/fpu/bits/fenv.h [__GLIBC_USE (IEC_60559_BFP_EXT)]
	(femode_t): New typedef.
	[__GLIBC_USE (IEC_60559_BFP_EXT)] (FE_DFL_MODE): New macro.
	* manual/arith.texi (FE_DFL_MODE): Document macro.
	(fegetmode): Document function.
	(fesetmode): Likewise.
	* math/Versions (fegetmode): New libm symbol at version
	GLIBC_2.25.
	(fesetmode): Likewise.
	* math/Makefile (libm-support): Add fegetmode and fesetmode.
	(tests): Add test-femode and test-femode-traps.
	* math/test-femode-traps.c: New file.
	* math/test-femode.c: Likewise.
	* sysdeps/powerpc/fpu/fenv_const.c (__fe_dfl_mode): Declare as
	alias for __fe_dfl_env.
	* sysdeps/powerpc/nofpu/fenv_const.c (__fe_dfl_mode): Likewise.
	* sysdeps/powerpc/powerpc32/e500/nofpu/fenv_const.c
	(__fe_dfl_mode): Likewise.
	* sysdeps/powerpc/Versions (__fe_dfl_mode): New libm symbol at
	version GLIBC_2.25.
	* sysdeps/nacl/libm.abilist: Update.
	* sysdeps/unix/sysv/linux/aarch64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/alpha/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/arm/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/hppa/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/i386/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm-le.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sh/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libm.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/tile/tilepro/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libm.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libm.abilist: Likewise.

7 files changed, 457 insertions, 3 deletions

diff --git a/math/Makefile b/math/Makefile
index 6a90a367ab..fc48960fb0 100644
--- a/math/Makefile
+++ b/math/Makefile
@@ -41,7 +41,8 @@ libm-support = s_lib_version s_matherr s_signgam			\
 	       fclrexcpt fgetexcptflg fraiseexcpt fsetexcptflg		\
 	       ftestexcept fegetround fesetround fegetenv feholdexcpt	\
 	       fesetenv feupdateenv t_exp fedisblxcpt feenablxcpt	\
-	       fegetexcept fesetexcept fetestexceptflag
+	       fegetexcept fesetexcept fetestexceptflag fegetmode	\
+	       fesetmode
 
 # Wrappers for these functions generated per type using a file named
 # <func>_template.c and the appropriate math-type-macros-<TYPE>.h.
@@ -152,7 +153,8 @@ tests = test-matherr test-fenv atest-exp atest-sincos atest-exp2 basic-test \
 	test-signgam-uint test-signgam-uint-init test-signgam-ullong \
 	test-signgam-ullong-init test-nan-overflow test-nan-payload \
 	test-fexcept test-fexcept-traps test-fesetexcept \
-	test-fesetexcept-traps test-fetestexceptflag $(tests-static)
+	test-fesetexcept-traps test-fetestexceptflag test-femode \
+	test-femode-traps $(tests-static)
 tests-static = test-fpucw-static test-fpucw-ieee-static \
 	       test-signgam-uchar-static test-signgam-uchar-init-static \
 	       test-signgam-uint-static test-signgam-uint-init-static \
diff --git a/math/Versions b/math/Versions
index 1c1683fed4..a429221340 100644
--- a/math/Versions
+++ b/math/Versions
@@ -215,6 +215,6 @@ libm {
     nextdown; nextdownf; nextdownl;
   }
   GLIBC_2.25 {
-    fesetexcept; fetestexceptflag;
+    fesetexcept; fetestexceptflag; fegetmode; fesetmode;
   }
 }
diff --git a/math/fegetmode.c b/math/fegetmode.c
new file mode 100644
index 0000000000..25f299fc13
--- /dev/null
+++ b/math/fegetmode.c
@@ -0,0 +1,27 @@
+/* Store current floating-point control modes.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fenv.h>
+
+int
+fegetmode (femode_t *modep)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+stub_warning (fegetmode)
diff --git a/math/fenv.h b/math/fenv.h
index 10d32db909..9006aa2fff 100644
--- a/math/fenv.h
+++ b/math/fenv.h
@@ -38,6 +38,12 @@
    fexcept_t	type for object representing the floating-point exception
 		flags including status associated with the flags
 
+   femode_t	type for object representing floating-point control modes
+
+   FE_DFL_MODE	macro of type pointer to const femode_t to be used as the
+		argument to fesetmode; in this case the default control
+		modes will be used
+
    The following macros are defined iff the implementation supports this
    kind of exception.
    FE_INEXACT		inexact result
@@ -122,6 +128,18 @@ extern int fesetenv (const fenv_t *__envp) __THROW;
 extern int feupdateenv (const fenv_t *__envp) __THROW;
 
 
+/* Control modes.  */
+
+#if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Store the current floating-point control modes in the object
+   pointed to by MODEP.  */
+extern int fegetmode (femode_t *__modep) __THROW;
+
+/* Establish the floating-point control modes represented by the
+   object pointed to by MODEP.  */
+extern int fesetmode (const femode_t *__modep) __THROW;
+#endif
+
 /* Include optimization.  */
 #ifdef __OPTIMIZE__
 # include <bits/fenvinline.h>
diff --git a/math/fesetmode.c b/math/fesetmode.c
new file mode 100644
index 0000000000..0d040e49a4
--- /dev/null
+++ b/math/fesetmode.c
@@ -0,0 +1,27 @@
+/* Install given floating-point control modes.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fenv.h>
+
+int
+fesetmode (const femode_t *modep)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+stub_warning (fesetmode)
diff --git a/math/test-femode-traps.c b/math/test-femode-traps.c
new file mode 100644
index 0000000000..dd22765831
--- /dev/null
+++ b/math/test-femode-traps.c
@@ -0,0 +1,149 @@
+/* Test femode_t functions: test handling of exception traps.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fenv.h>
+#include <stdio.h>
+#include <math-tests.h>
+
+static int
+test_ee (int exc1, int exc2)
+{
+  int result = 0;
+  printf ("testing %x %x\n", (unsigned int) exc1, (unsigned int) exc2);
+
+  fedisableexcept (FE_ALL_EXCEPT);
+  int ret = feenableexcept (exc1);
+  if (ret == -1)
+    {
+      if (EXCEPTION_ENABLE_SUPPORTED (exc1))
+	{
+	  puts ("first feenableexcept failed unexpectedly");
+	  result = 1;
+	}
+      else
+	puts ("first feenableexcept failed, cannot test");
+      return result;
+    }
+  femode_t saved;
+  ret = fegetmode (&saved);
+  if (ret != 0)
+    {
+      puts ("fegetmode failed");
+      result = 1;
+      return result;
+    }
+  fedisableexcept (FE_ALL_EXCEPT);
+  ret = feenableexcept (exc2);
+  if (ret == -1)
+    {
+      if (EXCEPTION_ENABLE_SUPPORTED (exc2))
+	{
+	  puts ("second feenableexcept failed unexpectedly");
+	  result = 1;
+	}
+      else
+	puts ("second feenableexcept failed, cannot test");
+      return result;
+    }
+  ret = fesetmode (&saved);
+  if (ret != 0)
+    {
+      puts ("fesetmode failed");
+      result = 1;
+      return result;
+    }
+  /* Verify that the set of enabled traps was restored.  */
+  ret = fegetexcept ();
+  if (ret != exc1)
+    {
+      printf ("restored enabled traps %x not %x\n", (unsigned int) ret,
+	      (unsigned int) exc1);
+      result = 1;
+    }
+  /* Likewise, with default modes.  */
+  ret = fesetmode (FE_DFL_MODE);
+  if (ret != 0)
+    {
+      puts ("fesetmode (FE_DFL_MODE) failed");
+      result = 1;
+      return result;
+    }
+  ret = fegetexcept ();
+  if (ret != 0)
+    {
+      printf ("FE_DFL_MODE enabled traps %x not 0\n", (unsigned int) ret);
+      result = 1;
+    }
+
+  return result;
+}
+
+static int
+test_e (int exc1)
+{
+  int result = 0;
+
+  result |= test_ee (exc1, 0);
+  result |= test_ee (exc1, FE_ALL_EXCEPT);
+#ifdef FE_DIVBYZERO
+  result |= test_ee (exc1, FE_DIVBYZERO);
+#endif
+#ifdef FE_INEXACT
+  result |= test_ee (exc1, FE_INEXACT);
+#endif
+#ifdef FE_INVALID
+  result |= test_ee (exc1, FE_INVALID);
+#endif
+#ifdef FE_OVERFLOW
+  result |= test_ee (exc1, FE_OVERFLOW);
+#endif
+#ifdef FE_UNDERFLOW
+  result |= test_ee (exc1, FE_UNDERFLOW);
+#endif
+
+  return result;
+}
+
+static int
+do_test (void)
+{
+  int result = 0;
+
+  result |= test_e (0);
+  result |= test_e (FE_ALL_EXCEPT);
+#ifdef FE_DIVBYZERO
+  result |= test_e (FE_DIVBYZERO);
+#endif
+#ifdef FE_INEXACT
+  result |= test_e (FE_INEXACT);
+#endif
+#ifdef FE_INVALID
+  result |= test_e (FE_INVALID);
+#endif
+#ifdef FE_OVERFLOW
+  result |= test_e (FE_OVERFLOW);
+#endif
+#ifdef FE_UNDERFLOW
+  result |= test_e (FE_UNDERFLOW);
+#endif
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/math/test-femode.c b/math/test-femode.c
new file mode 100644
index 0000000000..1e80f32225
--- /dev/null
+++ b/math/test-femode.c
@@ -0,0 +1,231 @@
+/* Test femode_t functions.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fenv.h>
+#include <stdio.h>
+#include <math-tests.h>
+
+static int
+test_mmee (int mode1, int mode2, int exc1, int exc2)
+{
+  int result = 0;
+  printf ("testing %x %x %x %x\n", (unsigned int) mode1, (unsigned int) mode2,
+	  (unsigned int) exc1, (unsigned int) exc2);
+
+  feclearexcept (FE_ALL_EXCEPT);
+  int ret = fesetround (mode1);
+  if (ret != 0)
+    {
+      if (ROUNDING_TESTS (float, mode1))
+	{
+	  puts ("first fesetround failed unexpectedly");
+	  result = 1;
+	}
+      else
+	puts ("first fesetround failed, cannot test");
+      return result;
+    }
+  ret = fesetexcept (exc1);
+  if (ret != 0)
+    {
+      if (EXCEPTION_TESTS (float) || exc1 == 0)
+	{
+	  puts ("first fesetexcept failed unexpectedly");
+	  result = 1;
+	}
+      else
+	puts ("first fesetexcept failed, cannot test");
+      return result;
+    }
+  femode_t saved;
+  ret = fegetmode (&saved);
+  if (ret != 0)
+    {
+      puts ("fegetmode failed");
+      result = 1;
+      return result;
+    }
+  feclearexcept (FE_ALL_EXCEPT);
+  ret = fesetround (mode2);
+  if (ret != 0)
+    {
+      if (ROUNDING_TESTS (float, mode2))
+	{
+	  puts ("second fesetround failed unexpectedly");
+	  result = 1;
+	}
+      else
+	puts ("second fesetround failed, cannot test");
+      return result;
+    }
+  ret = fesetexcept (exc2);
+  if (ret != 0)
+    {
+      if (EXCEPTION_TESTS (float) || exc2 == 0)
+	{
+	  puts ("second fesetexcept failed unexpectedly");
+	  result = 1;
+	}
+      else
+	puts ("second fesetexcept failed, cannot test");
+      return result;
+    }
+  ret = fesetmode (&saved);
+  if (ret != 0)
+    {
+      puts ("fesetmode failed");
+      result = 1;
+      return result;
+    }
+  /* Verify that the rounding mode was restored but the exception
+     flags remain unchanged.  */
+  ret = fegetround ();
+  if (ret != mode1)
+    {
+      printf ("restored rounding mode %x not %x\n", (unsigned int) ret,
+	      (unsigned int) mode1);
+      result = 1;
+    }
+  ret = fetestexcept (FE_ALL_EXCEPT);
+  if (ret != exc2)
+    {
+      printf ("exceptions %x not %x\n", (unsigned int) ret,
+	      (unsigned int) exc2);
+      result = 1;
+    }
+  /* Likewise, with default modes.  */
+  ret = fesetmode (FE_DFL_MODE);
+  if (ret != 0)
+    {
+      puts ("fesetmode (FE_DFL_MODE) failed");
+      result = 1;
+      return result;
+    }
+  ret = fegetround ();
+  if (ret != FE_TONEAREST)
+    {
+      printf ("FE_DFL_MODE rounding mode %x not %x\n", (unsigned int) ret,
+	      (unsigned int) FE_TONEAREST);
+      result = 1;
+    }
+  ret = fetestexcept (FE_ALL_EXCEPT);
+  if (ret != exc2)
+    {
+      printf ("FE_DFL_MODE exceptions %x not %x\n", (unsigned int) ret,
+	      (unsigned int) exc2);
+      result = 1;
+    }
+  return result;
+}
+
+static int
+test_mme (int mode1, int mode2, int exc1)
+{
+  int result = 0;
+
+  result |= test_mmee (mode1, mode2, exc1, 0);
+  result |= test_mmee (mode1, mode2, exc1, FE_ALL_EXCEPT);
+#ifdef FE_DIVBYZERO
+  result |= test_mmee (mode1, mode2, exc1, FE_DIVBYZERO);
+#endif
+#ifdef FE_INEXACT
+  result |= test_mmee (mode1, mode2, exc1, FE_INEXACT);
+#endif
+#ifdef FE_INVALID
+  result |= test_mmee (mode1, mode2, exc1, FE_INVALID);
+#endif
+#ifdef FE_OVERFLOW
+  result |= test_mmee (mode1, mode2, exc1, FE_OVERFLOW);
+#endif
+#ifdef FE_UNDERFLOW
+  result |= test_mmee (mode1, mode2, exc1, FE_UNDERFLOW);
+#endif
+
+  return result;
+}
+
+static int
+test_mm (int mode1, int mode2)
+{
+  int result = 0;
+
+  result |= test_mme (mode1, mode2, 0);
+  result |= test_mme (mode1, mode2, FE_ALL_EXCEPT);
+#ifdef FE_DIVBYZERO
+  result |= test_mme (mode1, mode2, FE_DIVBYZERO);
+#endif
+#ifdef FE_INEXACT
+  result |= test_mme (mode1, mode2, FE_INEXACT);
+#endif
+#ifdef FE_INVALID
+  result |= test_mme (mode1, mode2, FE_INVALID);
+#endif
+#ifdef FE_OVERFLOW
+  result |= test_mme (mode1, mode2, FE_OVERFLOW);
+#endif
+#ifdef FE_UNDERFLOW
+  result |= test_mme (mode1, mode2, FE_UNDERFLOW);
+#endif
+
+  return result;
+}
+
+static int
+test_m (int mode1)
+{
+  int result = 0;
+
+#ifdef FE_DOWNWARD
+  result |= test_mm (mode1, FE_DOWNWARD);
+#endif
+#ifdef FE_TONEAREST
+  result |= test_mm (mode1, FE_TONEAREST);
+#endif
+#ifdef FE_TOWARDZERO
+  result |= test_mm (mode1, FE_TOWARDZERO);
+#endif
+#ifdef FE_UPWARD
+  result |= test_mm (mode1, FE_UPWARD);
+#endif
+
+  return result;
+}
+
+static int
+do_test (void)
+{
+  int result = 0;
+
+#ifdef FE_DOWNWARD
+  result |= test_m (FE_DOWNWARD);
+#endif
+#ifdef FE_TONEAREST
+  result |= test_m (FE_TONEAREST);
+#endif
+#ifdef FE_TOWARDZERO
+  result |= test_m (FE_TOWARDZERO);
+#endif
+#ifdef FE_UPWARD
+  result |= test_m (FE_UPWARD);
+#endif
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"