LCOV - code coverage report
Current view: top level - libavutil - softfloat_ieee754.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 28 0.0 %
Date: 2017-12-14 19:11:59 Functions: 0 5 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2016 Umair Khan <omerjerk@gmail.com>
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : #ifndef AVUTIL_SOFTFLOAT_IEEE754_H
      22             : #define AVUTIL_SOFTFLOAT_IEEE754_H
      23             : 
      24             : #include <stdint.h>
      25             : 
      26             : #define EXP_BIAS 127
      27             : #define MANT_BITS 23
      28             : 
      29             : typedef struct SoftFloat_IEEE754 {
      30             :     int32_t sign;
      31             :     uint64_t mant;
      32             :     int32_t  exp;
      33             : } SoftFloat_IEEE754;
      34             : 
      35             : static const SoftFloat_IEEE754 FLOAT_0 = {0, 0, -126};
      36             : static const SoftFloat_IEEE754 FLOAT_1 = {0, 0,    0};
      37             : 
      38             : /** Normalize the softfloat as defined by IEEE 754 single-recision floating
      39             :  *  point specification
      40             :  */
      41           0 : static inline SoftFloat_IEEE754 av_normalize_sf_ieee754(SoftFloat_IEEE754 sf) {
      42           0 :     while( sf.mant >= 0x1000000UL ) {
      43           0 :         sf.exp++;
      44           0 :         sf.mant >>= 1;
      45             :     }
      46           0 :     sf.mant &= 0x007fffffUL;
      47           0 :     return sf;
      48             : }
      49             : 
      50             : /** Convert integer to softfloat.
      51             :  *  @return softfloat with value n * 2^e
      52             :  */
      53           0 : static inline SoftFloat_IEEE754 av_int2sf_ieee754(int64_t n, int e) {
      54           0 :     int sign = 0;
      55             : 
      56           0 :     if (n < 0) {
      57           0 :         sign = 1;
      58           0 :         n    *= -1;
      59             :     }
      60           0 :     return av_normalize_sf_ieee754((SoftFloat_IEEE754) {sign, n << MANT_BITS, 0 + e});
      61             : }
      62             : 
      63             : /** Make a softfloat out of the bitstream. Assumes the bits are in the form as defined
      64             :  *  by the IEEE 754 spec.
      65             :  */
      66           0 : static inline SoftFloat_IEEE754 av_bits2sf_ieee754(uint32_t n) {
      67           0 :     return ((SoftFloat_IEEE754) { (n & 0x80000000UL), (n & 0x7FFFFFUL), (n & 0x7F800000UL) });
      68             : }
      69             : 
      70             : /** Convert the softfloat to integer
      71             :  */
      72             : static inline int av_sf2int_ieee754(SoftFloat_IEEE754 a) {
      73             :     if(a.exp >= 0) return a.mant <<  a.exp ;
      74             :     else           return a.mant >>(-a.exp);
      75             : }
      76             : 
      77             : /** Divide a by b. b should not be zero.
      78             :  *  @return normalized result
      79             :  */
      80           0 : static inline SoftFloat_IEEE754 av_div_sf_ieee754(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
      81             :     int32_t mant, exp, sign;
      82           0 :     a    = av_normalize_sf_ieee754(a);
      83           0 :     b    = av_normalize_sf_ieee754(b);
      84           0 :     sign = a.sign ^ b.sign;
      85           0 :     mant = ((((uint64_t) (a.mant | 0x00800000UL)) << MANT_BITS) / (b.mant| 0x00800000UL));
      86           0 :     exp  = a.exp - b.exp;
      87           0 :     return av_normalize_sf_ieee754((SoftFloat_IEEE754) {sign, mant, exp});
      88             : }
      89             : 
      90             : /** Multiply a with b
      91             :  *  #return normalized result
      92             :  */
      93             : static inline SoftFloat_IEEE754 av_mul_sf_ieee754(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
      94             :     int32_t sign, mant, exp;
      95             :     a    = av_normalize_sf_ieee754(a);
      96             :     b    = av_normalize_sf_ieee754(b);
      97             :     sign = a.sign ^ b.sign;
      98             :     mant = (((uint64_t)(a.mant|0x00800000UL) * (uint64_t)(b.mant|0x00800000UL))>>MANT_BITS);
      99             :     exp  = a.exp + b.exp;
     100             :     return av_normalize_sf_ieee754((SoftFloat_IEEE754) {sign, mant, exp});
     101             : }
     102             : 
     103             : /** Compare a with b strictly
     104             :  *  @returns 1 if the a and b are equal, 0 otherwise.
     105             :  */
     106           0 : static inline int av_cmp_sf_ieee754(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
     107           0 :     a = av_normalize_sf_ieee754(a);
     108           0 :     b = av_normalize_sf_ieee754(b);
     109           0 :     if (a.sign != b.sign) return 0;
     110           0 :     if (a.mant != b.mant) return 0;
     111           0 :     if (a.exp  != b.exp ) return 0;
     112           0 :     return 1;
     113             : }
     114             : 
     115             : #endif /*AVUTIL_SOFTFLOAT_IEEE754_H*/

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