Rev 660 | Rev 734 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 647 | cejka | 1 | /* |
| 2 | * Copyright (C) 2005 Josef Cejka |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | #include<sftypes.h> |
||
| 30 | #include<comparison.h> |
||
| 31 | |||
| 32 | inline int isFloat32NaN(float32 f) |
||
| 33 | { /* NaN : exp = 0xff and nonzero mantisa */ |
||
| 34 | return ((f.parts.exp==0xFF)&&(f.parts.mantisa)); |
||
| 35 | }; |
||
| 36 | |||
| 37 | inline int isFloat32SigNaN(float32 f) |
||
| 38 | { /* SigNaN : exp = 0xff mantisa = 1xxxxx..x (binary), where at least one x is nonzero */ |
||
| 39 | return ((f.parts.exp==0xFF)&&(f.parts.mantisa>0x400000)); |
||
| 40 | }; |
||
| 41 | |||
| 652 | cejka | 42 | inline int isFloat32Infinity(float32 f) |
| 43 | { |
||
| 44 | return ((f.parts.exp==0xFF)&&(f.parts.mantisa==0x0)); |
||
| 45 | }; |
||
| 46 | |||
| 688 | cejka | 47 | inline int isFloat32Zero(float32 f) |
| 48 | { |
||
| 49 | return (((f.binary) & 0x7FFFFFFF) == 0); |
||
| 50 | } |
||
| 51 | |||
| 652 | cejka | 52 | /** |
| 53 | * @return 1, if both floats are equal - but NaNs are not recognized |
||
| 54 | */ |
||
| 55 | inline int isFloat32eq(float32 a, float32 b) |
||
| 56 | { |
||
| 660 | cejka | 57 | return ((a.binary==b.binary)||(((a.binary| b.binary)&0x7FFFFFFF)==0)); /* a equals to b or both are zeros (with any sign) */ |
| 652 | cejka | 58 | } |
| 59 | |||
| 60 | /** |
||
| 653 | cejka | 61 | * @return 1, if a<b - but NaNs are not recognized |
| 652 | cejka | 62 | */ |
| 63 | inline int isFloat32lt(float32 a, float32 b) |
||
| 64 | { |
||
| 65 | if (((a.binary| b.binary)&0x7FFFFFFF)==0) { |
||
| 660 | cejka | 66 | return 0; /* +- zeroes */ |
| 652 | cejka | 67 | }; |
| 660 | cejka | 68 | |
| 69 | if ((a.parts.sign)&&(b.parts.sign)) { |
||
| 70 | /*if both are negative, smaller is that with greater binary value*/ |
||
| 71 | return (a.binary>b.binary); |
||
| 72 | }; |
||
| 73 | |||
| 74 | /* lets negate signs - now will be positive numbers allways bigger than negative (first bit will be set for unsigned integer comparison)*/ |
||
| 75 | a.parts.sign=!a.parts.sign; |
||
| 76 | b.parts.sign=!b.parts.sign; |
||
| 652 | cejka | 77 | return (a.binary<b.binary); |
| 78 | |||
| 79 | } |
||
| 80 | |||
| 653 | cejka | 81 | /** |
| 82 | * @return 1, if a>b - but NaNs are not recognized |
||
| 83 | */ |
||
| 84 | inline int isFloat32gt(float32 a, float32 b) |
||
| 85 | { |
||
| 86 | if (((a.binary| b.binary)&0x7FFFFFFF)==0) { |
||
| 660 | cejka | 87 | return 0; /* zeroes are equal with any sign */ |
| 653 | cejka | 88 | }; |
| 660 | cejka | 89 | |
| 90 | if ((a.parts.sign)&&(b.parts.sign)) { |
||
| 91 | /*if both are negative, greater is that with smaller binary value*/ |
||
| 92 | return (a.binary<b.binary); |
||
| 93 | }; |
||
| 94 | |||
| 95 | /* lets negate signs - now will be positive numbers allways bigger than negative (first bit will be set for unsigned integer comparison)*/ |
||
| 96 | a.parts.sign=!a.parts.sign; |
||
| 97 | b.parts.sign=!b.parts.sign; |
||
| 653 | cejka | 98 | return (a.binary>b.binary); |
| 99 | |||
| 100 | } |
||
| 652 | cejka | 101 | |
| 653 | cejka | 102 |