Re: [PATCH v2 01/10] math: Add test to check if ceil raise inexact floating-point exception

["H.J. Lu" <hjl.tools@gmail.com>]

On Wed, Apr 3, 2024 at 5:11 AM Adhemerval Zanella
<adhemerval.zanella@linaro.org> wrote:
>
> It is not allowed anymore on ISO C23.
> ---
>  math/Makefile             |  5 +++
>  math/test-ceil-except-2.c | 67 ++++++++++++++++++++++++++++++
>  math/test-ceil-except.c   | 85 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 157 insertions(+)
>  create mode 100644 math/test-ceil-except-2.c
>  create mode 100644 math/test-ceil-except.c
>
> diff --git a/math/Makefile b/math/Makefile
> index 121a709121..1017026d23 100644
> --- a/math/Makefile
> +++ b/math/Makefile
> @@ -498,6 +498,8 @@ tests = \
>    bug-nextafter \
>    bug-nexttoward \
>    bug-tgmath1 \
> +  test-ceil-except \
> +  test-ceil-except-2 \
>    test-femode \
>    test-femode-traps \
>    test-fenv basic-test \
> @@ -989,6 +991,9 @@ CFLAGS-test-fe-snans-always-signal.c += $(config-cflags-signaling-nans)
>
>  CFLAGS-test-nan-const.c += -fno-builtin
>
> +CFLAGS-test-ceil-except.c += -fno-builtin
> +CFLAGS-test-ceil-except-2.c += -fno-builtin
> +
>  include ../Rules
>
>  gen-all-calls = $(gen-libm-calls) $(gen-calls)
> diff --git a/math/test-ceil-except-2.c b/math/test-ceil-except-2.c
> new file mode 100644
> index 0000000000..394a272d89
> --- /dev/null
> +++ b/math/test-ceil-except-2.c
> @@ -0,0 +1,67 @@
> +/* Test ceil functions do not disable exception traps.
> +   Copyright (C) 2024 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
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <fenv.h>
> +#include <math.h>
> +#include <stdio.h>
> +
> +#ifndef FE_INEXACT
> +# define FE_INEXACT 0
> +#endif
> +
> +#define TEST_FUNC(NAME, FLOAT, SUFFIX)                                 \
> +static int                                                             \
> +NAME (void)                                                            \
> +{                                                                      \
> +  int result = 0;                                                      \
> +  volatile FLOAT a, b __attribute__ ((unused));                                \
> +  a = 1.5;                                                             \
> +  /* ceil must work when traps on "inexact" are enabled.  */   \
> +  b = ceil ## SUFFIX (a);                                              \
> +  /* And it must have left those traps enabled.  */                    \
> +  if (fegetexcept () == FE_INEXACT)                                    \
> +    puts ("PASS: " #FLOAT);                                            \
> +  else                                                                 \
> +    {                                                                  \
> +      puts ("FAIL: " #FLOAT);                                          \
> +      result = 1;                                                      \
> +    }                                                                  \
> +  return result;                                                       \
> +}
> +
> +TEST_FUNC (float_test, float, f)
> +TEST_FUNC (double_test, double, )
> +TEST_FUNC (ldouble_test, long double, l)
> +
> +static int
> +do_test (void)
> +{
> +  if (feenableexcept (FE_INEXACT) == -1)
> +    {
> +      puts ("enabling FE_INEXACT traps failed, cannot test");
> +      return 77;
> +    }
> +  int result = float_test ();
> +  feenableexcept (FE_INEXACT);
> +  result |= double_test ();
> +  feenableexcept (FE_INEXACT);
> +  result |= ldouble_test ();
> +  return result;
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/math/test-ceil-except.c b/math/test-ceil-except.c
> new file mode 100644
> index 0000000000..f7627506f7
> --- /dev/null
> +++ b/math/test-ceil-except.c
> @@ -0,0 +1,85 @@
> +/* Test ceil functions do not clear exceptions.
> +   Copyright (C) 2024 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
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <fenv.h>
> +#include <math.h>
> +#include <stdbool.h>
> +#include <stdio.h>
> +
> +#include <math-tests.h>
> +
> +#ifndef FE_INVALID
> +# define FE_INVALID 0
> +#endif
> +
> +static bool any_supported = false;
> +
> +#define TEST_FUNC(NAME, FLOAT, SUFFIX)                                 \
> +static int                                                             \
> +NAME (void)                                                            \
> +{                                                                      \
> +  int result = 0;                                                      \
> +  if (!EXCEPTION_TESTS (FLOAT))                                                \
> +    return 0;                                                          \
> +  any_supported = true;                                                        \
> +  volatile FLOAT a, b __attribute__ ((unused));                                \
> +  a = 1.0;                                                             \
> +  /* ceil must not clear already-raised exceptions.  */                \
> +  feraiseexcept (FE_ALL_EXCEPT);                                       \
> +  b = ceil ## SUFFIX (a);                                              \
> +  if (fetestexcept (FE_ALL_EXCEPT) == FE_ALL_EXCEPT)                   \
> +    puts ("PASS: " #FLOAT);                                            \
> +  else                                                                 \
> +    {                                                                  \
> +      puts ("FAIL: " #FLOAT);                                          \
> +      result = 1;                                                      \
> +    }                                                                  \
> +  /* But it mustn't lose exceptions from sNaN arguments.  */           \
> +  if (SNAN_TESTS (FLOAT))                                              \
> +    {                                                                  \
> +      static volatile FLOAT snan = __builtin_nans ## SUFFIX ("");      \
> +      volatile FLOAT c __attribute__ ((unused));                       \
> +      feclearexcept (FE_ALL_EXCEPT);                                   \
> +      c = ceil ## SUFFIX (snan);                                       \
> +      if (fetestexcept (FE_INVALID) == FE_INVALID)                     \
> +       puts ("PASS: " #FLOAT " sNaN");                                 \
> +      else                                                             \
> +       {                                                               \
> +         puts ("FAIL: " #FLOAT " sNaN");                               \
> +         result = 1;                                                   \
> +       }                                                               \
> +    }                                                                  \
> +  return result;                                                       \
> +}
> +
> +TEST_FUNC (float_test, float, f)
> +TEST_FUNC (double_test, double, )
> +TEST_FUNC (ldouble_test, long double, l)
> +
> +static int
> +do_test (void)
> +{
> +  int result = float_test ();
> +  result |= double_test ();
> +  result |= ldouble_test ();
> +  if (!any_supported)
> +    return 77;
> +  return result;
> +}
> +
> +#include <support/test-driver.c>
> --
> 2.34.1
>

LGTM.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

Thanks.

-- 
H.J.