Blame sysdeps/s390/fpu/fix-fp-int-compare-invalid.h

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/* Fix for missing "invalid" exceptions from floating-point
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   comparisons.  s390 version.
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   Copyright (C) 2016-2018 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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   <http://www.gnu.org/licenses/>.  */
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#ifndef FIX_FP_INT_COMPARE_INVALID_H
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#define FIX_FP_INT_COMPARE_INVALID_H	1
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/* GCC uses unordered comparison instructions like cebr (Short BFP COMPARE)
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   when it should use ordered comparison instructions like kebr
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   (Short BFP COMPARE AND SIGNAL) in order to raise invalid exceptions if
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   any operand is quiet (or signaling) NAN. See gcc bugzilla:
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   <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77918>.
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   There exists an equivalent gcc bugzilla for Intel:
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   <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52451>.
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   Once the s390 gcc bug is fixed, the definition of FIX_COMPARE_INVALID
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   should have a __GNUC_PREREQ conditional added so that e.g. the workaround
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   to call feraiseexcept (FE_INVALID) in math/s_iseqsig_template.c can be
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   avoided.  */
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#define FIX_COMPARE_INVALID 1
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#endif /* fix-fp-int-compare-invalid.h */