mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-21 12:30:06 +00:00
math: x86 floor traps when FE_INEXACT is enabled (BZ 31601)
The implementations of floor functions using x87 floating point (i386 and 86_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
637bfc392f
commit
932544efa4
@ -511,6 +511,7 @@ tests = \
|
|||||||
test-fetestexceptflag \
|
test-fetestexceptflag \
|
||||||
test-fexcept \
|
test-fexcept \
|
||||||
test-fexcept-traps \
|
test-fexcept-traps \
|
||||||
|
test-floor-except-2 \
|
||||||
test-flt-eval-method \
|
test-flt-eval-method \
|
||||||
test-fp-ilogb-constants \
|
test-fp-ilogb-constants \
|
||||||
test-fp-llogb-constants \
|
test-fp-llogb-constants \
|
||||||
@ -991,6 +992,7 @@ CFLAGS-test-fe-snans-always-signal.c += $(config-cflags-signaling-nans)
|
|||||||
CFLAGS-test-nan-const.c += -fno-builtin
|
CFLAGS-test-nan-const.c += -fno-builtin
|
||||||
|
|
||||||
CFLAGS-test-ceil-except-2.c += -fno-builtin
|
CFLAGS-test-ceil-except-2.c += -fno-builtin
|
||||||
|
CFLAGS-test-floor-except-2.c += -fno-builtin
|
||||||
|
|
||||||
include ../Rules
|
include ../Rules
|
||||||
|
|
||||||
|
|||||||
67
math/test-floor-except-2.c
Normal file
67
math/test-floor-except-2.c
Normal file
@ -0,0 +1,67 @@
|
|||||||
|
/* Test floor 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; \
|
||||||
|
/* floor must work when traps on "inexact" are enabled. */ \
|
||||||
|
b = floor ## 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_floor.S,v 1.4 1995/05/09 00:01:59 jtc Exp $")
|
|
||||||
|
|
||||||
ENTRY(__floor)
|
|
||||||
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 $0x400,%edx /* round towards -oo */
|
|
||||||
orl 4(%esp),%edx
|
|
||||||
andl $0xf7ff,%edx
|
|
||||||
movl %edx,(%esp)
|
|
||||||
fldcw (%esp) /* load modified control word */
|
|
||||||
|
|
||||||
frndint /* round */
|
|
||||||
|
|
||||||
fldenv 4(%esp) /* restore original environment */
|
|
||||||
|
|
||||||
addl $32,%esp
|
|
||||||
cfi_adjust_cfa_offset (-32)
|
|
||||||
ret
|
|
||||||
END (__floor)
|
|
||||||
libm_alias_double (__floor, floor)
|
|
||||||
25
sysdeps/i386/fpu/s_floor.c
Normal file
25
sysdeps/i386/fpu/s_floor.c
Normal file
@ -0,0 +1,25 @@
|
|||||||
|
/* Return smallest integral value not less than argument. i386 version.
|
||||||
|
Copyright (C) 2024 Free Software Foundation, Inc.
|
||||||
|
This file is part of the GNU C Library.
|
||||||
|
|
||||||
|
The GNU C Library is free software; you can redistribute it and/or
|
||||||
|
modify it under the terms of the GNU Lesser General Public
|
||||||
|
License as published by the Free Software Foundation; either
|
||||||
|
version 2.1 of the License, or (at your option) any later version.
|
||||||
|
|
||||||
|
The GNU C Library is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
Lesser General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU Lesser General Public
|
||||||
|
License along with the GNU C Library; if not, see
|
||||||
|
<https://www.gnu.org/licenses/>. */
|
||||||
|
|
||||||
|
#include <libm-alias-double.h>
|
||||||
|
|
||||||
|
#define FUNC __floor
|
||||||
|
#define TYPE double
|
||||||
|
#define FE_OPTION FE_DOWNWARD
|
||||||
|
#include "s_nearestint_387_template.c"
|
||||||
|
libm_alias_double (__floor, floor)
|
||||||
@ -1,34 +0,0 @@
|
|||||||
/*
|
|
||||||
* Public domain.
|
|
||||||
*/
|
|
||||||
|
|
||||||
#include <machine/asm.h>
|
|
||||||
#include <libm-alias-float.h>
|
|
||||||
|
|
||||||
RCSID("$NetBSD: s_floorf.S,v 1.3 1995/05/09 00:04:32 jtc Exp $")
|
|
||||||
|
|
||||||
ENTRY(__floorf)
|
|
||||||
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 $0x400,%edx /* round towards -oo */
|
|
||||||
orl 4(%esp),%edx
|
|
||||||
andl $0xf7ff,%edx
|
|
||||||
movl %edx,(%esp)
|
|
||||||
fldcw (%esp) /* load modified control word */
|
|
||||||
|
|
||||||
frndint /* round */
|
|
||||||
|
|
||||||
fldenv 4(%esp) /* restore original environment */
|
|
||||||
|
|
||||||
addl $32,%esp
|
|
||||||
cfi_adjust_cfa_offset (-32)
|
|
||||||
ret
|
|
||||||
END (__floorf)
|
|
||||||
libm_alias_float (__floor, floor)
|
|
||||||
25
sysdeps/i386/fpu/s_floorf.c
Normal file
25
sysdeps/i386/fpu/s_floorf.c
Normal file
@ -0,0 +1,25 @@
|
|||||||
|
/* Largest integral value not greater than argument i386 version.
|
||||||
|
Copyright (C) 2024 Free Software Foundation, Inc.
|
||||||
|
This file is part of the GNU C Library.
|
||||||
|
|
||||||
|
The GNU C Library is free software; you can redistribute it and/or
|
||||||
|
modify it under the terms of the GNU Lesser General Public
|
||||||
|
License as published by the Free Software Foundation; either
|
||||||
|
version 2.1 of the License, or (at your option) any later version.
|
||||||
|
|
||||||
|
The GNU C Library is distributed in the hope that it will be useful,
|
||||||
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
Lesser General Public License for more details.
|
||||||
|
|
||||||
|
You should have received a copy of the GNU Lesser General Public
|
||||||
|
License along with the GNU C Library; if not, see
|
||||||
|
<https://www.gnu.org/licenses/>. */
|
||||||
|
|
||||||
|
#include <libm-alias-float.h>
|
||||||
|
|
||||||
|
#define FUNC __floorf
|
||||||
|
#define TYPE float
|
||||||
|
#define FE_OPTION FE_DOWNWARD
|
||||||
|
#include "s_nearestint_387_template.c"
|
||||||
|
libm_alias_float (__floor, floor)
|
||||||
@ -1,39 +0,0 @@
|
|||||||
/*
|
|
||||||
* Public domain.
|
|
||||||
*/
|
|
||||||
|
|
||||||
#include <libm-alias-ldouble.h>
|
|
||||||
#include <machine/asm.h>
|
|
||||||
|
|
||||||
RCSID("$NetBSD: $")
|
|
||||||
|
|
||||||
ENTRY(__floorl)
|
|
||||||
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 $0x400,%edx /* round towards -oo */
|
|
||||||
orl 4(%esp),%edx
|
|
||||||
andl $0xf7ff,%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 (__floorl)
|
|
||||||
libm_alias_ldouble (__floor, floor)
|
|
||||||
25
sysdeps/x86/fpu/s_floorl.c
Normal file
25
sysdeps/x86/fpu/s_floorl.c
Normal file
@ -0,0 +1,25 @@
|
|||||||
|
/* Return largest 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 __floorl
|
||||||
|
#define TYPE long double
|
||||||
|
#define FE_OPTION FE_DOWNWARD
|
||||||
|
#include "s_nearestint_387_template.c"
|
||||||
|
libm_alias_ldouble (__floor, floor)
|
||||||
@ -1,33 +0,0 @@
|
|||||||
/*
|
|
||||||
* Public domain.
|
|
||||||
*/
|
|
||||||
|
|
||||||
#include <libm-alias-ldouble.h>
|
|
||||||
#include <machine/asm.h>
|
|
||||||
|
|
||||||
ENTRY(__floorl)
|
|
||||||
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 $0x400,%edx /* round towards -oo */
|
|
||||||
orl -28(%rsp),%edx
|
|
||||||
andl $0xf7ff,%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 (__floorl)
|
|
||||||
libm_alias_ldouble (__floor, floor)
|
|
||||||
Loading…
Reference in New Issue
Block a user