| 1 | /*
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| 2 | * Copyright (c) 2005 Josef Cejka
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - 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 | * - 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 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup softfloat
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include<sftypes.h>
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| 36 | #include<comparison.h>
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| 37 |
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| 38 | inline int isFloat32NaN(float32 f)
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| 39 | { /* NaN : exp = 0xff and nonzero fraction */
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| 40 | return ((f.parts.exp==0xFF)&&(f.parts.fraction));
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| 41 | }
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| 42 |
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| 43 | inline int isFloat64NaN(float64 d)
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| 44 | { /* NaN : exp = 0x7ff and nonzero fraction */
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| 45 | return ((d.parts.exp==0x7FF)&&(d.parts.fraction));
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| 46 | }
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| 47 |
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| 48 | inline int isFloat32SigNaN(float32 f)
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| 49 | { /* SigNaN : exp = 0xff fraction = 0xxxxx..x (binary), where at least one x is nonzero */
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| 50 | return ((f.parts.exp==0xFF)&&(f.parts.fraction<0x400000)&&(f.parts.fraction));
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| 51 | }
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| 52 |
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| 53 | inline int isFloat64SigNaN(float64 d)
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| 54 | { /* SigNaN : exp = 0x7ff fraction = 0xxxxx..x (binary), where at least one x is nonzero */
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| 55 | return ((d.parts.exp==0x7FF)&&(d.parts.fraction)&&(d.parts.fraction<0x8000000000000ll));
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| 56 | }
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| 57 |
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| 58 | inline int isFloat32Infinity(float32 f)
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| 59 | {
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| 60 | return ((f.parts.exp==0xFF)&&(f.parts.fraction==0x0));
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| 61 | }
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| 62 |
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| 63 | inline int isFloat64Infinity(float64 d)
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| 64 | {
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| 65 | return ((d.parts.exp==0x7FF)&&(d.parts.fraction==0x0));
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| 66 | }
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| 67 |
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| 68 | inline int isFloat32Zero(float32 f)
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| 69 | {
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| 70 | return (((f.binary) & 0x7FFFFFFF) == 0);
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| 71 | }
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| 72 |
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| 73 | inline int isFloat64Zero(float64 d)
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| 74 | {
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| 75 | return (((d.binary) & 0x7FFFFFFFFFFFFFFFll) == 0);
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| 76 | }
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| 77 |
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| 78 | /**
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| 79 | * @return 1, if both floats are equal - but NaNs are not recognized
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| 80 | */
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| 81 | inline int isFloat32eq(float32 a, float32 b)
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| 82 | {
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| 83 | return ((a.binary==b.binary)||(((a.binary| b.binary)&0x7FFFFFFF)==0)); /* a equals to b or both are zeros (with any sign) */
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| 84 | }
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| 85 |
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| 86 | /**
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| 87 | * @return 1, if a<b - but NaNs are not recognized
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| 88 | */
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| 89 | inline int isFloat32lt(float32 a, float32 b)
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| 90 | {
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| 91 | if (((a.binary| b.binary)&0x7FFFFFFF)==0) {
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| 92 | return 0; /* +- zeroes */
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| 93 | };
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| 94 |
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| 95 | if ((a.parts.sign)&&(b.parts.sign)) {
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| 96 | /*if both are negative, smaller is that with greater binary value*/
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| 97 | return (a.binary>b.binary);
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| 98 | };
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| 99 |
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| 100 | /* lets negate signs - now will be positive numbers allways bigger than negative (first bit will be set for unsigned integer comparison)*/
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| 101 | a.parts.sign=!a.parts.sign;
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| 102 | b.parts.sign=!b.parts.sign;
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| 103 | return (a.binary<b.binary);
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| 104 |
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| 105 | }
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| 106 |
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| 107 | /**
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| 108 | * @return 1, if a>b - but NaNs are not recognized
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| 109 | */
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| 110 | inline int isFloat32gt(float32 a, float32 b)
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| 111 | {
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| 112 | if (((a.binary| b.binary)&0x7FFFFFFF)==0) {
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| 113 | return 0; /* zeroes are equal with any sign */
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| 114 | };
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| 115 |
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| 116 | if ((a.parts.sign)&&(b.parts.sign)) {
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| 117 | /*if both are negative, greater is that with smaller binary value*/
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| 118 | return (a.binary<b.binary);
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| 119 | };
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| 120 |
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| 121 | /* lets negate signs - now will be positive numbers allways bigger than negative (first bit will be set for unsigned integer comparison)*/
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| 122 | a.parts.sign=!a.parts.sign;
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| 123 | b.parts.sign=!b.parts.sign;
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| 124 | return (a.binary>b.binary);
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| 125 |
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| 126 | }
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| 127 |
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| 128 | /** @}
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| 129 | */
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