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| Rev | Author | Line No. | Line |
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| 4973 | right-hear | 1 | /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
| 2 | /* |
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| 3 | * Copyright (c) 1994 Winning Strategies, Inc. |
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| 4 | * All rights reserved. |
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| 5 | * |
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| 6 | * Redistribution and use in source and binary forms, with or without |
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| 7 | * modification, are permitted provided that the following conditions |
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| 8 | * are met: |
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| 9 | * 1. Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * 3. All advertising materials mentioning features or use of this software |
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| 15 | * must display the following acknowledgement: |
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| 16 | * This product includes software developed by Winning Strategies, Inc. |
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| 17 | * 4. The name of the author may not be used to endorse or promote products |
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| 18 | * derived from this software without specific prior written permission. |
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| 19 | * |
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| 20 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 21 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 22 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 23 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 24 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 25 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 26 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 27 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 29 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 30 | */ |
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| 31 | |||
| 32 | #if defined(LIBM_SCCS) && !defined(lint) |
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| 33 | static char rcsid[] = "$Id: s_isinf.c,v 1.6 1994/08/18 23:06:54 jtc Exp $"; |
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| 34 | #endif |
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| 35 | |||
| 36 | /* |
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| 37 | * isinf(x) returns 1 is x is inf, else 0; |
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| 38 | * no branching! |
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| 39 | */ |
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| 40 | |||
| 41 | #include "math.h" |
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| 42 | #include "math_private.h" |
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| 43 | |||
| 44 | #ifdef __STDC__ |
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| 45 | int isinf(double x) |
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| 46 | #else |
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| 47 | int isinf(x) |
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| 48 | double x; |
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| 49 | #endif |
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| 50 | { |
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| 51 | int32_t hx,lx; |
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| 52 | EXTRACT_WORDS(hx,lx,x); |
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| 53 | hx &= 0x7fffffff; |
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| 54 | hx ^= 0x7ff00000; |
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| 55 | hx |= lx; |
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| 56 | return (hx == 0); |
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| 57 | } |