90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
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(C) Copyright IBM Corp. 2009
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of IBM nor the names of its contributors may be
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used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <math.h>
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#include <errno.h>
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#include "fdlibm.h"
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long double
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hypotl (long double x, long double y)
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{
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#ifdef _LDBL_EQ_DBL
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/* On platforms where long double is as wide as double. */
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return hypot(x, y);
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#else
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long double z;
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z = __ieee754_hypotl (x, y);
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if (_LIB_VERSION == _IEEE_)
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return z;
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if ((! finitel (z)) && finitel (x) && finitel (y))
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{
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/* hypot (finite, finite) overflow. */
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struct exception exc;
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exc.type = OVERFLOW;
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exc.name = "hypotl";
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exc.err = 0;
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exc.arg1 = x;
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exc.arg2 = y;
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if (_LIB_VERSION == _SVID_)
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exc.retval = HUGE;
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else
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{
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#ifndef HUGE_VAL
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#define HUGE_VAL inf
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double inf = 0.0;
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SET_HIGH_WORD (inf, 0x7ff00000); /* Set inf to infinite. */
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#endif
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exc.retval = HUGE_VAL;
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}
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if (_LIB_VERSION == _POSIX_)
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errno = ERANGE;
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else if (! matherr (& exc))
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errno = ERANGE;
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if (exc.err != 0)
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errno = exc.err;
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return (long double) exc.retval;
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}
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return z;
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#endif /* ! _LDBL_EQ_DBL */
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}
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