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54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
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/* Total order operation. dbl-64 version.
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Copyright (C) 2016 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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#include <math.h>
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#include <math_private.h>
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#include <stdint.h>
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int
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totalorder (double x, double y)
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{
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int32_t hx, hy;
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uint32_t lx, ly;
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EXTRACT_WORDS (hx, lx, x);
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EXTRACT_WORDS (hy, ly, y);
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#ifdef HIGH_ORDER_BIT_IS_SET_FOR_SNAN
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uint32_t uhx = hx & 0x7fffffff, uhy = hy & 0x7fffffff;
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/* For the preferred quiet NaN convention, this operation is a
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comparison of the representations of the arguments interpreted as
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sign-magnitude integers. If both arguments are NaNs, invert the
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quiet/signaling bit so comparing that way works. */
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if ((uhx > 0x7ff00000 || (uhx == 0x7ff00000 && lx != 0))
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&& (uhy > 0x7ff00000 || (uhy == 0x7ff00000 && ly != 0)))
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{
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hx ^= 0x00080000;
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hy ^= 0x00080000;
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}
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#endif
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uint32_t hx_sign = hx >> 31;
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uint32_t hy_sign = hy >> 31;
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hx ^= hx_sign >> 1;
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lx ^= hx_sign;
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hy ^= hy_sign >> 1;
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ly ^= hy_sign;
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return hx < hy || (hx == hy && lx <= ly);
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}
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#ifdef NO_LONG_DOUBLE
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weak_alias (totalorder, totalorderl)
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#endif
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