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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 = \
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test-fetestexceptflag \
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test-fexcept \
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test-fexcept-traps \
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test-floor-except-2 \
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test-flt-eval-method \
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test-fp-ilogb-constants \
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test-fp-llogb-constants \
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@ -991,6 +992,7 @@ CFLAGS-test-fe-snans-always-signal.c += $(config-cflags-signaling-nans)
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CFLAGS-test-nan-const.c += -fno-builtin
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CFLAGS-test-ceil-except-2.c += -fno-builtin
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CFLAGS-test-floor-except-2.c += -fno-builtin
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include ../Rules
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67
math/test-floor-except-2.c
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67
math/test-floor-except-2.c
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@ -0,0 +1,67 @@
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/* Test floor functions do not disable exception traps.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <math.h>
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#include <stdio.h>
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#ifndef FE_INEXACT
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# define FE_INEXACT 0
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#endif
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#define TEST_FUNC(NAME, FLOAT, SUFFIX) \
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static int \
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NAME (void) \
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{ \
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int result = 0; \
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volatile FLOAT a, b __attribute__ ((unused)); \
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a = 1.5; \
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/* floor must work when traps on "inexact" are enabled. */ \
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b = floor ## SUFFIX (a); \
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/* And it must have left those traps enabled. */ \
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if (fegetexcept () == FE_INEXACT) \
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puts ("PASS: " #FLOAT); \
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else \
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{ \
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puts ("FAIL: " #FLOAT); \
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result = 1; \
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} \
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return result; \
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}
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TEST_FUNC (float_test, float, f)
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TEST_FUNC (double_test, double, )
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TEST_FUNC (ldouble_test, long double, l)
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static int
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do_test (void)
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{
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if (feenableexcept (FE_INEXACT) == -1)
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{
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puts ("enabling FE_INEXACT traps failed, cannot test");
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return 77;
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}
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int result = float_test ();
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feenableexcept (FE_INEXACT);
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result |= double_test ();
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feenableexcept (FE_INEXACT);
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result |= ldouble_test ();
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return result;
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}
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#include <support/test-driver.c>
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@ -1,34 +0,0 @@
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/*
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* Public domain.
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*/
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#include <machine/asm.h>
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#include <libm-alias-double.h>
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RCSID("$NetBSD: s_floor.S,v 1.4 1995/05/09 00:01:59 jtc Exp $")
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ENTRY(__floor)
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fldl 4(%esp)
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subl $32,%esp
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cfi_adjust_cfa_offset (32)
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fnstenv 4(%esp) /* store fpu environment */
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/* We use here %edx although only the low 1 bits are defined.
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But none of the operations should care and they are faster
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than the 16 bit operations. */
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movl $0x400,%edx /* round towards -oo */
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orl 4(%esp),%edx
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andl $0xf7ff,%edx
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movl %edx,(%esp)
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fldcw (%esp) /* load modified control word */
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frndint /* round */
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fldenv 4(%esp) /* restore original environment */
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addl $32,%esp
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cfi_adjust_cfa_offset (-32)
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ret
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END (__floor)
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libm_alias_double (__floor, floor)
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25
sysdeps/i386/fpu/s_floor.c
Normal file
25
sysdeps/i386/fpu/s_floor.c
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@ -0,0 +1,25 @@
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/* Return smallest integral value not less than argument. i386 version.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <libm-alias-double.h>
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#define FUNC __floor
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#define TYPE double
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#define FE_OPTION FE_DOWNWARD
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#include "s_nearestint_387_template.c"
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libm_alias_double (__floor, floor)
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@ -1,34 +0,0 @@
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/*
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* Public domain.
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*/
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#include <machine/asm.h>
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#include <libm-alias-float.h>
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RCSID("$NetBSD: s_floorf.S,v 1.3 1995/05/09 00:04:32 jtc Exp $")
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ENTRY(__floorf)
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flds 4(%esp)
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subl $32,%esp
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cfi_adjust_cfa_offset (32)
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fnstenv 4(%esp) /* store fpu environment */
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/* We use here %edx although only the low 1 bits are defined.
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But none of the operations should care and they are faster
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than the 16 bit operations. */
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movl $0x400,%edx /* round towards -oo */
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orl 4(%esp),%edx
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andl $0xf7ff,%edx
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movl %edx,(%esp)
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fldcw (%esp) /* load modified control word */
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frndint /* round */
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fldenv 4(%esp) /* restore original environment */
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addl $32,%esp
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cfi_adjust_cfa_offset (-32)
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ret
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END (__floorf)
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libm_alias_float (__floor, floor)
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25
sysdeps/i386/fpu/s_floorf.c
Normal file
25
sysdeps/i386/fpu/s_floorf.c
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@ -0,0 +1,25 @@
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/* Largest integral value not greater than argument i386 version.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <libm-alias-float.h>
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#define FUNC __floorf
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#define TYPE float
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#define FE_OPTION FE_DOWNWARD
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#include "s_nearestint_387_template.c"
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libm_alias_float (__floor, floor)
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@ -1,39 +0,0 @@
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/*
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* Public domain.
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*/
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#include <libm-alias-ldouble.h>
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#include <machine/asm.h>
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RCSID("$NetBSD: $")
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ENTRY(__floorl)
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fldt 4(%esp)
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subl $32,%esp
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cfi_adjust_cfa_offset (32)
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fnstenv 4(%esp) /* store fpu environment */
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/* We use here %edx although only the low 1 bits are defined.
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But none of the operations should care and they are faster
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than the 16 bit operations. */
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movl $0x400,%edx /* round towards -oo */
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orl 4(%esp),%edx
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andl $0xf7ff,%edx
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movl %edx,(%esp)
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fldcw (%esp) /* load modified control word */
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frndint /* round */
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/* Preserve "invalid" exceptions from sNaN input. */
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fnstsw
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andl $0x1, %eax
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orl %eax, 8(%esp)
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fldenv 4(%esp) /* restore original environment */
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addl $32,%esp
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cfi_adjust_cfa_offset (-32)
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ret
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END (__floorl)
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libm_alias_ldouble (__floor, floor)
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25
sysdeps/x86/fpu/s_floorl.c
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25
sysdeps/x86/fpu/s_floorl.c
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@ -0,0 +1,25 @@
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/* Return largest integral value not less than argument. x86 version.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <libm-alias-ldouble.h>
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#define FUNC __floorl
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#define TYPE long double
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#define FE_OPTION FE_DOWNWARD
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#include "s_nearestint_387_template.c"
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libm_alias_ldouble (__floor, floor)
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@ -1,33 +0,0 @@
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/*
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* Public domain.
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*/
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#include <libm-alias-ldouble.h>
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#include <machine/asm.h>
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ENTRY(__floorl)
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fldt 8(%rsp)
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fnstenv -28(%rsp) /* store fpu environment */
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/* We use here %edx although only the low 1 bits are defined.
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But none of the operations should care and they are faster
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than the 16 bit operations. */
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movl $0x400,%edx /* round towards -oo */
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orl -28(%rsp),%edx
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andl $0xf7ff,%edx
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movl %edx,-32(%rsp)
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fldcw -32(%rsp) /* load modified control word */
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frndint /* round */
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/* Preserve "invalid" exceptions from sNaN input. */
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fnstsw
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andl $0x1, %eax
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orl %eax, -24(%rsp)
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fldenv -28(%rsp) /* restore original environment */
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ret
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END (__floorl)
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libm_alias_ldouble (__floor, floor)
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