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58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/* Total order operation. ldbl-96 version.
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Copyright (C) 2016-2017 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 <float.h>
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#include <math.h>
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#include <math_private.h>
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#include <nan-high-order-bit.h>
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#include <stdint.h>
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int
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totalorderl (long double x, long double y)
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{
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int16_t expx, expy;
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uint32_t hx, hy;
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uint32_t lx, ly;
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GET_LDOUBLE_WORDS (expx, hx, lx, x);
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GET_LDOUBLE_WORDS (expy, hy, ly, y);
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if (LDBL_MIN_EXP == -16382)
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{
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/* M68K variant: for the greatest exponent, the high mantissa
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bit is not significant and both values of it are valid, so
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set it before comparing. For the Intel variant, only one
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value of the high mantissa bit is valid for each exponent, so
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this is not necessary. */
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if ((expx & 0x7fff) == 0x7fff)
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hx |= 0x80000000;
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if ((expy & 0x7fff) == 0x7fff)
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hy |= 0x80000000;
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}
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#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
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# error not implemented
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#endif
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uint32_t x_sign = expx >> 15;
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uint32_t y_sign = expy >> 15;
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expx ^= x_sign >> 17;
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hx ^= x_sign;
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lx ^= x_sign;
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expy ^= y_sign >> 17;
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hy ^= y_sign;
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ly ^= y_sign;
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return expx < expy || (expx == expy && (hx < hy || (hx == hy && lx <= ly)));
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}
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