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According to ISO C23 (7.6.4.4), fesetexcept is supposed to set floating-point exception flags without raising a trap (unlike feraiseexcept, which is supposed to raise a trap if feenableexcept was called with the appropriate argument). The flags can be set in the 387 unit or in the SSE unit. To set a flag, it is sufficient to do it in the SSE unit, because that is guaranteed to not trap. However, on i386 CPUs that have only a 387 unit, set the flags in the 387, as long as this cannot trap. Checked on i686-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
30 lines
1.2 KiB
C
30 lines
1.2 KiB
C
/* Configuration for math tests: support for setting exception flags
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without causing enabled traps. i686 version.
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Copyright (C) 2023 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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#ifndef I386_FPU_MATH_TESTS_TRAP_FORCE_H
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#define I386_FPU_MATH_TESTS_TRAP_FORCE_H 1
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#include <cpu-features.h>
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/* Setting exception flags in FPU Status Register results in enabled traps for
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those exceptions being taken. */
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#define EXCEPTION_SET_FORCES_TRAP !CPU_FEATURE_USABLE (SSE)
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#endif /* math-tests-trap-force.h. */
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