Mercurial > projects > ldc
annotate druntime/src/compiler/dmd/cmath2.d @ 759:d3eb054172f9
Added copy of druntime from DMD 2.020 modified for LDC.
author | Tomas Lindquist Olsen <tomas.l.olsen@gmail.com> |
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date | Tue, 11 Nov 2008 01:52:37 +0100 |
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759
d3eb054172f9
Added copy of druntime from DMD 2.020 modified for LDC.
Tomas Lindquist Olsen <tomas.l.olsen@gmail.com>
parents:
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1 |
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2 // Copyright (C) 2001-2003 by Digital Mars |
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3 // All Rights Reserved |
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4 // www.digitalmars.com |
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5 |
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6 // Runtime support for complex arithmetic code generation |
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7 // (for linux) |
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8 |
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9 /* |
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10 * Modified by Sean Kelly for use with the D Runtime Project |
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11 */ |
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12 |
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13 module rt.cmath2; |
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14 |
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15 private import stdc.math; |
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16 |
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17 extern (C): |
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18 |
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19 /**************************** |
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20 * Multiply two complex floating point numbers, x and y. |
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21 * Input: |
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22 * x.re ST3 |
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23 * x.im ST2 |
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24 * y.re ST1 |
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25 * y.im ST0 |
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26 * Output: |
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27 * ST1 real part |
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28 * ST0 imaginary part |
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29 */ |
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30 |
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31 void _Cmul() |
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32 { |
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33 // p.re = x.re * y.re - x.im * y.im; |
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34 // p.im = x.im * y.re + x.re * y.im; |
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35 asm |
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36 { naked ; |
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37 fld ST(1) ; // x.re |
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38 fmul ST,ST(4) ; // ST0 = x.re * y.re |
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39 |
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40 fld ST(1) ; // y.im |
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41 fmul ST,ST(4) ; // ST0 = x.im * y.im |
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42 |
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43 fsubp ST(1),ST ; // ST0 = x.re * y.re - x.im * y.im |
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44 |
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45 fld ST(3) ; // x.im |
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46 fmul ST,ST(3) ; // ST0 = x.im * y.re |
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47 |
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48 fld ST(5) ; // x.re |
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49 fmul ST,ST(3) ; // ST0 = x.re * y.im |
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50 |
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51 faddp ST(1),ST ; // ST0 = x.im * y.re + x.re * y.im |
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52 |
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53 fxch ST(4),ST ; |
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54 fstp ST(0) ; |
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55 fxch ST(4),ST ; |
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56 fstp ST(0) ; |
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57 fstp ST(0) ; |
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58 fstp ST(0) ; |
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59 |
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60 ret ; |
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61 } |
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62 /+ |
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63 if (isnan(x) && isnan(y)) |
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64 { |
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65 // Recover infinities that computed as NaN+ iNaN ... |
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66 int recalc = 0; |
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67 if ( isinf( a) || isinf( b) ) |
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68 { // z is infinite |
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69 // "Box" the infinity and change NaNs in the other factor to 0 |
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70 a = copysignl( isinf( a) ? 1.0 : 0.0, a); |
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71 b = copysignl( isinf( b) ? 1.0 : 0.0, b); |
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72 if (isnan( c)) c = copysignl( 0.0, c); |
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73 if (isnan( d)) d = copysignl( 0.0, d); |
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74 recalc = 1; |
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75 } |
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76 if (isinf(c) || isinf(d)) |
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77 { // w is infinite |
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78 // "Box" the infinity and change NaNs in the other factor to 0 |
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79 c = copysignl( isinf( c) ? 1.0 : 0.0, c); |
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80 d = copysignl( isinf( d) ? 1.0 : 0.0, d); |
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81 if (isnan( a)) a = copysignl( 0.0, a); |
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82 if (isnan( b)) b = copysignl( 0.0, b); |
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83 recalc = 1; |
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84 } |
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85 if (!recalc && (isinf(ac) || isinf(bd) || |
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86 isinf(ad) || isinf(bc))) |
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87 { |
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88 // Recover infinities from overflow by changing NaNs to 0 ... |
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89 if (isnan( a)) a = copysignl( 0.0, a); |
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90 if (isnan( b)) b = copysignl( 0.0, b); |
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91 if (isnan( c)) c = copysignl( 0.0, c); |
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92 if (isnan( d)) d = copysignl( 0.0, d); |
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93 recalc = 1; |
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94 } |
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95 if (recalc) |
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96 { |
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97 x = INFINITY * (a * c - b * d); |
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98 y = INFINITY * (a * d + b * c); |
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99 } |
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100 } |
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101 +/ |
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102 } |
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103 |
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104 /**************************** |
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105 * Divide two complex floating point numbers, x / y. |
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106 * Input: |
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107 * x.re ST3 |
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108 * x.im ST2 |
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109 * y.re ST1 |
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110 * y.im ST0 |
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111 * Output: |
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112 * ST1 real part |
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113 * ST0 imaginary part |
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114 */ |
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115 |
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116 void _Cdiv() |
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117 { |
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118 real x_re, x_im; |
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119 real y_re, y_im; |
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120 real q_re, q_im; |
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121 real r; |
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122 real den; |
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123 |
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124 asm |
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125 { |
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126 fstp y_im ; |
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127 fstp y_re ; |
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128 fstp x_im ; |
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129 fstp x_re ; |
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130 } |
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131 |
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132 if (fabs(y_re) < fabs(y_im)) |
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133 { |
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134 r = y_re / y_im; |
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135 den = y_im + r * y_re; |
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136 q_re = (x_re * r + x_im) / den; |
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137 q_im = (x_im * r - x_re) / den; |
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138 } |
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139 else |
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140 { |
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141 r = y_im / y_re; |
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142 den = y_re + r * y_im; |
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143 q_re = (x_re + r * x_im) / den; |
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144 q_im = (x_im - r * x_re) / den; |
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145 } |
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146 //printf("q.re = %g, q.im = %g\n", (double)q_re, (double)q_im); |
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147 /+ |
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148 if (isnan(q_re) && isnan(q_im)) |
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149 { |
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150 real denom = y_re * y_re + y_im * y_im; |
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151 |
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152 // non-zero / zero |
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153 if (denom == 0.0 && (!isnan(x_re) || !isnan(x_im))) |
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154 { |
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155 q_re = copysignl(INFINITY, y_re) * x_re; |
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156 q_im = copysignl(INFINITY, y_re) * x_im; |
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157 } |
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158 // infinite / finite |
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159 else if ((isinf(x_re) || isinf(x_im)) && isfinite(y_re) && isfinite(y_im)) |
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160 { |
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161 x_re = copysignl(isinf(x_re) ? 1.0 : 0.0, x_re); |
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162 x_im = copysignl(isinf(x_im) ? 1.0 : 0.0, x_im); |
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163 q_re = INFINITY * (x_re * y_re + x_im * y_im); |
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164 q_im = INFINITY * (x_im * y_re - x_re * y_im); |
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165 } |
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166 // finite / infinite |
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167 else if (isinf(logbw) && isfinite(x_re) && isfinite(x_im)) |
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168 { |
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169 y_re = copysignl(isinf(y_re) ? 1.0 : 0.0, y_re); |
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170 y_im = copysignl(isinf(y_im) ? 1.0 : 0.0, y_im); |
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171 q_re = 0.0 * (x_re * y_re + x_im * y_im); |
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172 q_im = 0.0 * (x_im * y_re - x_re * y_im); |
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173 } |
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174 } |
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175 return q_re + q_im * 1.0i; |
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176 +/ |
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177 asm |
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178 { |
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179 fld q_re; |
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180 fld q_im; |
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181 } |
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182 } |
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183 |
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184 /**************************** |
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185 * Compare two complex floating point numbers, x and y. |
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186 * Input: |
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187 * x.re ST3 |
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188 * x.im ST2 |
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189 * y.re ST1 |
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190 * y.im ST0 |
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191 * Output: |
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192 * 8087 stack is cleared |
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193 * flags set |
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194 */ |
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195 |
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196 void _Ccmp() |
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197 { |
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198 asm |
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199 { naked ; |
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200 fucomp ST(2) ; // compare x.im and y.im |
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201 fstsw AX ; |
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202 sahf ; |
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203 jne L1 ; |
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204 jp L1 ; // jmp if NAN |
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205 fucomp ST(2) ; // compare x.re and y.re |
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206 fstsw AX ; |
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207 sahf ; |
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208 fstp ST(0) ; // pop |
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209 fstp ST(0) ; // pop |
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210 ret ; |
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211 |
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212 L1: |
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213 fstp ST(0) ; // pop |
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214 fstp ST(0) ; // pop |
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215 fstp ST(0) ; // pop |
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216 ret ; |
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217 } |
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218 } |