Mercurial > projects > ldc
annotate dmd2/complex_t.h @ 1047:6bb04dbee21f
Some calling convention work for x86-64:
- Implement x86-64 extern(C), hopefully correctly.
- Tried to be a bit smarter about extern(D) while I was there.
Interestingly, this code seems to be generating more efficient code than
gcc and llvm-gcc in some edge cases, like returning a `{ [7 x i8] }` loaded from
a stack slot from an extern(C) function. (gcc generates 7 1-byte loads, while
this code generates a 4-byte, a 2-byte and a 1-byte load)
I also added some changes to make sure structs being returned from functions or
passed in as parameters are stored in memory where the rest of the backend seems
to expect them to be. These should be removed when support for first-class
aggregates improves.
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Fri, 06 Mar 2009 16:00:47 +0100 |
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 |