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63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* Total order operation. ldbl-128ibm 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 <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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double xhi, xlo, yhi, ylo;
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int64_t hx, hy, lx, ly;
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ldbl_unpack (x, &xhi, &xlo);
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EXTRACT_WORDS64 (hx, xhi);
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ldbl_unpack (y, &yhi, &ylo);
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EXTRACT_WORDS64 (hy, yhi);
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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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uint64_t hx_sign = hx >> 63;
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uint64_t hy_sign = hy >> 63;
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int64_t hx_adj = hx ^ (hx_sign >> 1);
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int64_t hy_adj = hy ^ (hy_sign >> 1);
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if (hx_adj < hy_adj)
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return 1;
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else if (hx_adj > hy_adj)
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return 0;
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/* The high doubles are identical. If they are NaNs or both the low
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parts are zero, the low parts are not significant (and if they
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are infinities, both the low parts must be zero). */
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if ((hx & 0x7fffffffffffffffULL) >= 0x7ff0000000000000ULL)
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return 1;
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EXTRACT_WORDS64 (lx, xlo);
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EXTRACT_WORDS64 (ly, ylo);
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if (((lx | ly) & 0x7fffffffffffffffULL) == 0)
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return 1;
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/* Otherwise compare the low parts. */
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uint64_t lx_sign = lx >> 63;
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uint64_t ly_sign = ly >> 63;
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lx ^= lx_sign >> 1;
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ly ^= ly_sign >> 1;
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return lx <= ly;
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}
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