47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* Total order operation. flt-32 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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totalorderf (float x, float y)
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{
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int32_t ix, iy;
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GET_FLOAT_WORD (ix, x);
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GET_FLOAT_WORD (iy, y);
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#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
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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 ((ix & 0x7fffffff) > 0x7f800000 && (iy & 0x7fffffff) > 0x7f800000)
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{
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ix ^= 0x00400000;
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iy ^= 0x00400000;
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}
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#endif
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uint32_t ix_sign = ix >> 31;
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uint32_t iy_sign = iy >> 31;
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ix ^= ix_sign >> 1;
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iy ^= iy_sign >> 1;
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return ix <= iy;
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}
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