glibc/math/test-trunc-except-2.c
Adhemerval Zanella 44ccc2465c math: x86 trunc traps when FE_INEXACT is enabled (BZ 31603)
The implementations of trunc functions using x87 floating point (i386 and
x86_64 long double only) traps when FE_INEXACT is enabled.  Although
this is a GNU extension outside the scope of the C standard, other
architectures that also support traps do not show this behavior.

The fix moves the implementation to a common one that holds any
exceptions with a 'fnclex' (libc_feholdexcept_setround_387).

Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
2024-04-04 14:29:28 -03:00

68 lines
1.9 KiB
C

/* Test trunc 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; \
/* trunc must work when traps on "inexact" are enabled. */ \
b = trunc ## 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>