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annotate dmd2/complex_t.h @ 1351:8d501abecd24

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Initial (but disabled) fix for ticket #294 , the actual part that fixes the bug is in a #if 0 block as I'm afraid it will cause regressions. I'm most likely not going to be around tonight, and maybe not tomorrow as well, so I'm pushing it in case someone wants to run some serious testing/investigate the problem noted in llvmhelpers.cpp : realignOffset .
author Tomas Lindquist Olsen <tomas.l.olsen gmail com>
date Thu, 14 May 2009 17:20:17 +0200
parents f04dde6e882c
children
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1
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2 // Compiler implementation of the D programming language
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3 // Copyright (c) 1999-2006 by Digital Mars
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4 // All Rights Reserved
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5 // written by Walter Bright and Burton Radons
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6 // http://www.digitalmars.com
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7 // License for redistribution is by either the Artistic License
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8 // in artistic.txt, or the GNU General Public License in gnu.txt.
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9 // See the included readme.txt for details.
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11 #ifndef DMD_COMPLEX_T_H
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12 #define DMD_COMPLEX_T_H
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14 /* Roll our own complex type for compilers that don't support complex
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15 */
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17 struct complex_t
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18 {
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19 long double re;
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20 long double im;
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22 complex_t() { this->re = 0; this->im = 0; }
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23 complex_t(long double re) { this->re = re; this->im = 0; }
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24 complex_t(long double re, long double im) { this->re = re; this->im = im; }
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26 complex_t operator + (complex_t y) { complex_t r; r.re = re + y.re; r.im = im + y.im; return r; }
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27 complex_t operator - (complex_t y) { complex_t r; r.re = re - y.re; r.im = im - y.im; return r; }
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28 complex_t operator - () { complex_t r; r.re = -re; r.im = -im; return r; }
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29 complex_t operator * (complex_t y) { return complex_t(re * y.re - im * y.im, im * y.re + re * y.im); }
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30
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31 complex_t operator / (complex_t y)
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32 {
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33 long double abs_y_re = y.re < 0 ? -y.re : y.re;
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34 long double abs_y_im = y.im < 0 ? -y.im : y.im;
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35 long double r, den;
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37 if (abs_y_re < abs_y_im)
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38 {
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39 r = y.re / y.im;
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40 den = y.im + r * y.re;
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41 return complex_t((re * r + im) / den,
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42 (im * r - re) / den);
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43 }
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44 else
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45 {
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46 r = y.im / y.re;
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47 den = y.re + r * y.im;
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48 return complex_t((re + r * im) / den,
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49 (im - r * re) / den);
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50 }
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51 }
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53 operator bool () { return re || im; }
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55 int operator == (complex_t y) { return re == y.re && im == y.im; }
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56 int operator != (complex_t y) { return re != y.re || im != y.im; }
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57 };
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59 inline complex_t operator * (long double x, complex_t y) { return complex_t(x) * y; }
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60 inline complex_t operator * (complex_t x, long double y) { return x * complex_t(y); }
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61 inline complex_t operator / (complex_t x, long double y) { return x / complex_t(y); }
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62
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64 inline long double creall(complex_t x)
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65 {
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66 return x.re;
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67 }
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68
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69 inline long double cimagl(complex_t x)
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70 {
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71 return x.im;
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72 }
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74 #endif