mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 14:20:07 +00:00
math: x86 ceill traps when FE_INEXACT is enabled (BZ 31600)
The implementations of ceil 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>
This commit is contained in:
Adhemerval Zanella
parent
87cb1dfcd6
commit
637bfc392f
@ -498,6 +498,7 @@ tests = \
|
||||
bug-nextafter \
|
||||
bug-nexttoward \
|
||||
bug-tgmath1 \
|
||||
test-ceil-except-2 \
|
||||
test-femode \
|
||||
test-femode-traps \
|
||||
test-fenv basic-test \
|
||||
@ -989,6 +990,8 @@ CFLAGS-test-fe-snans-always-signal.c += $(config-cflags-signaling-nans)
|
||||
|
||||
CFLAGS-test-nan-const.c += -fno-builtin
|
||||
|
||||
CFLAGS-test-ceil-except-2.c += -fno-builtin
|
||||
|
||||
include ../Rules
|
||||
|
||||
gen-all-calls = $(gen-libm-calls) $(gen-calls)
|
||||
|
||||
67
math/test-ceil-except-2.c
Normal file
67
math/test-ceil-except-2.c
Normal file
@ -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>
|
||||
@ -1,34 +0,0 @@
|
||||
/*
|
||||
* Public domain.
|
||||
*/
|
||||
|
||||
#include <machine/asm.h>
|
||||
#include <libm-alias-double.h>
|
||||
|
||||
RCSID("$NetBSD: s_ceil.S,v 1.4 1995/05/08 23:52:13 jtc Exp $")
|
||||
|
||||
ENTRY(__ceil)
|
||||
fldl 4(%esp)
|
||||
subl $32,%esp
|
||||
cfi_adjust_cfa_offset (32)
|
||||
|
||||
fnstenv 4(%esp) /* store fpu environment */
|
||||
|
||||
/* We use here %edx although only the low 1 bits are defined.
|
||||
But none of the operations should care and they are faster
|
||||
than the 16 bit operations. */
|
||||
movl $0x0800,%edx /* round towards +oo */
|
||||
orl 4(%esp),%edx
|
||||
andl $0xfbff,%edx
|
||||
movl %edx,(%esp)
|
||||
fldcw (%esp) /* load modified control word */
|
||||
|
||||
frndint /* round */
|
||||
|
||||
fldenv 4(%esp) /* restore original environment */
|
||||
|
||||
addl $32,%esp
|
||||
cfi_adjust_cfa_offset (-32)
|
||||
ret
|
||||
END (__ceil)
|
||||
libm_alias_double (__ceil, ceil)
|
||||
25
sysdeps/i386/fpu/s_ceil.c
Normal file
25
sysdeps/i386/fpu/s_ceil.c
Normal file
@ -0,0 +1,25 @@
|
||||
/* Return smallest integral value not less than argument. i386 version.
|
||||
Copyright (C) 2024 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<https://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <libm-alias-double.h>
|
||||
|
||||
#define FUNC __ceil
|
||||
#define TYPE double
|
||||
#define FE_OPTION FE_UPWARD
|
||||
#include "s_nearestint_387_template.c"
|
||||
libm_alias_double (__ceil, ceil)
|
||||
@ -1,34 +0,0 @@
|
||||
/*
|
||||
* Public domain.
|
||||
*/
|
||||
|
||||
#include <machine/asm.h>
|
||||
#include <libm-alias-float.h>
|
||||
|
||||
RCSID("$NetBSD: s_ceilf.S,v 1.3 1995/05/08 23:52:44 jtc Exp $")
|
||||
|
||||
ENTRY(__ceilf)
|
||||
flds 4(%esp)
|
||||
subl $32,%esp
|
||||
cfi_adjust_cfa_offset (32)
|
||||
|
||||
fnstenv 4(%esp) /* store fpu environment */
|
||||
|
||||
/* We use here %edx although only the low 1 bits are defined.
|
||||
But none of the operations should care and they are faster
|
||||
than the 16 bit operations. */
|
||||
movl $0x0800,%edx /* round towards +oo */
|
||||
orl 4(%esp),%edx
|
||||
andl $0xfbff,%edx
|
||||
movl %edx,(%esp)
|
||||
fldcw (%esp) /* load modified control word */
|
||||
|
||||
frndint /* round */
|
||||
|
||||
fldenv 4(%esp) /* restore original environment */
|
||||
|
||||
addl $32,%esp
|
||||
cfi_adjust_cfa_offset (-32)
|
||||
ret
|
||||
END (__ceilf)
|
||||
libm_alias_float (__ceil, ceil)
|
||||
25
sysdeps/i386/fpu/s_ceilf.c
Normal file
25
sysdeps/i386/fpu/s_ceilf.c
Normal file
@ -0,0 +1,25 @@
|
||||
/* Return largest integral value not less than argument. i386 version.
|
||||
Copyright (C) 2024 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, see
|
||||
<https://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <libm-alias-float.h>
|
||||
|
||||
#define FUNC __ceilf
|
||||
#define TYPE float
|
||||
#define FE_OPTION FE_UPWARD
|
||||
#include "s_nearestint_387_template.c"
|
||||
libm_alias_float (__ceil, ceil)
|
||||
@ -1,39 +0,0 @@
|
||||
/*
|
||||
* Public domain.
|
||||
*/
|
||||
|
||||
#include <libm-alias-ldouble.h>
|
||||
#include <machine/asm.h>
|
||||
|
||||
RCSID("$NetBSD: $")
|
||||
|
||||
ENTRY(__ceill)
|
||||
fldt 4(%esp)
|
||||
subl $32,%esp
|
||||
cfi_adjust_cfa_offset (32)
|
||||
|
||||
fnstenv 4(%esp) /* store fpu environment */
|
||||
|
||||
/* We use here %edx although only the low 1 bits are defined.
|
||||
But none of the operations should care and they are faster
|
||||
than the 16 bit operations. */
|
||||
movl $0x0800,%edx /* round towards +oo */
|
||||
orl 4(%esp),%edx
|
||||
andl $0xfbff,%edx
|
||||
movl %edx,(%esp)
|
||||
fldcw (%esp) /* load modified control word */
|
||||
|
||||
frndint /* round */
|
||||
|
||||
/* Preserve "invalid" exceptions from sNaN input. */
|
||||
fnstsw
|
||||
andl $0x1, %eax
|
||||
orl %eax, 8(%esp)
|
||||
|
||||
fldenv 4(%esp) /* restore original environment */
|
||||
|
||||
addl $32,%esp
|
||||
cfi_adjust_cfa_offset (-32)
|
||||
ret
|
||||
END (__ceill)
|
||||
libm_alias_ldouble (__ceil, ceil)
|
||||
25
sysdeps/x86/fpu/s_ceill.c
Normal file
25
sysdeps/x86/fpu/s_ceill.c
Normal file
@ -0,0 +1,25 @@
|
||||
/* Return smallest integral value not less than argument. x86 version.
|
||||
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 <libm-alias-ldouble.h>
|
||||
|
||||
#define FUNC __ceill
|
||||
#define TYPE long double
|
||||
#define FE_OPTION FE_UPWARD
|
||||
#include "s_nearestint_387_template.c"
|
||||
libm_alias_ldouble (__ceil, ceil)
|
||||
36
sysdeps/x86/fpu/s_nearestint_387_template.c
Normal file
36
sysdeps/x86/fpu/s_nearestint_387_template.c
Normal file
@ -0,0 +1,36 @@
|
||||
/* Nearest integet template for x86.
|
||||
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/>. */
|
||||
|
||||
#define NO_MATH_REDIRECT
|
||||
#include <math.h>
|
||||
#include <fenv_private.h>
|
||||
|
||||
TYPE
|
||||
FUNC (TYPE x)
|
||||
{
|
||||
fenv_t fenv;
|
||||
TYPE r;
|
||||
|
||||
libc_feholdexcept_setround_387 (&fenv, FE_OPTION);
|
||||
asm volatile ("frndint" : "=t" (r) : "0" (x));
|
||||
/* Preserve "invalid" exceptions from sNaN input. */
|
||||
fenv.__status_word |= libc_fetestexcept_387 (FE_INVALID);
|
||||
libc_fesetenv_387 (&fenv);
|
||||
|
||||
return r;
|
||||
}
|
||||
@ -1,34 +0,0 @@
|
||||
/*
|
||||
* Public domain.
|
||||
*/
|
||||
|
||||
#include <libm-alias-ldouble.h>
|
||||
#include <machine/asm.h>
|
||||
|
||||
|
||||
ENTRY(__ceill)
|
||||
fldt 8(%rsp)
|
||||
|
||||
fnstenv -28(%rsp) /* store fpu environment */
|
||||
|
||||
/* We use here %edx although only the low 1 bits are defined.
|
||||
But none of the operations should care and they are faster
|
||||
than the 16 bit operations. */
|
||||
movl $0x0800,%edx /* round towards +oo */
|
||||
orl -28(%rsp),%edx
|
||||
andl $0xfbff,%edx
|
||||
movl %edx,-32(%rsp)
|
||||
fldcw -32(%rsp) /* load modified control word */
|
||||
|
||||
frndint /* round */
|
||||
|
||||
/* Preserve "invalid" exceptions from sNaN input. */
|
||||
fnstsw
|
||||
andl $0x1, %eax
|
||||
orl %eax, -24(%rsp)
|
||||
|
||||
fldenv -28(%rsp) /* restore original environment */
|
||||
|
||||
ret
|
||||
END (__ceill)
|
||||
libm_alias_ldouble (__ceil, ceil)
|
||||
Loading…
Reference in New Issue
Block a user