Mercurial > projects > ldc
annotate dmd2/complex_t.h @ 1168:ab186e535e72
A different fix to #218 and DMD2682 that does not lead to constant folding regressions.
Fixes run/const_15, run/c/const_16_B.
The price is removing the lvalueness of struct literals. If it turns out too
much code depends on this behavior or we don't want to break with DMD, we
could keep struct literals as lvalues and instead convert struct literals used
as expression initializers into struct initializers.
author | Christian Kamm <kamm incasoftware de> |
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date | Sun, 29 Mar 2009 11:43:45 +0200 |
parents | f04dde6e882c |
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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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10 |
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11 #ifndef DMD_COMPLEX_T_H |
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12 #define DMD_COMPLEX_T_H |
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13 |
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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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16 |
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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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21 |
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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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25 |
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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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36 |
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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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52 |
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53 operator bool () { return re || im; } |
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54 |
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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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58 |
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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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63 |
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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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73 |
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74 #endif |