Mercurial > cpython-lru_cache-weakref

annotate Modules/fpetestmodule.c @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents 1af7f719ed28
children 94f64f11fdd0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 ---------------------------------------------------------------------
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3 / Copyright (c) 1996. \
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4 | The Regents of the University of California. |
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5 | All rights reserved. |
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6 | |
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7 | Permission to use, copy, modify, and distribute this software for |
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8 | any purpose without fee is hereby granted, provided that this en- |
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9 | tire notice is included in all copies of any software which is or |
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10 | includes a copy or modification of this software and in all |
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11 | copies of the supporting documentation for such software. |
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12 | |
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13 | This work was produced at the University of California, Lawrence |
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14 | Livermore National Laboratory under contract no. W-7405-ENG-48 |
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15 | between the U.S. Department of Energy and The Regents of the |
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16 | University of California for the operation of UC LLNL. |
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17 | |
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18 | DISCLAIMER |
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19 | |
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20 | This software was prepared as an account of work sponsored by an |
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21 | agency of the United States Government. Neither the United States |
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22 | Government nor the University of California nor any of their em- |
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23 | ployees, makes any warranty, express or implied, or assumes any |
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24 | liability or responsibility for the accuracy, completeness, or |
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25 | usefulness of any information, apparatus, product, or process |
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26 | disclosed, or represents that its use would not infringe |
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27 | privately-owned rights. Reference herein to any specific commer- |
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28 | cial products, process, or service by trade name, trademark, |
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29 | manufacturer, or otherwise, does not necessarily constitute or |
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30 | imply its endorsement, recommendation, or favoring by the United |
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31 | States Government or the University of California. The views and |
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32 | opinions of authors expressed herein do not necessarily state or |
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33 | reflect those of the United States Government or the University |
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34 | of California, and shall not be used for advertising or product |
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35 \ endorsement purposes. /
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36 ---------------------------------------------------------------------
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37 */
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38
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39 /*
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40 Floating point exception test module.
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41
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42 */
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43
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44 #include "Python.h"
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45
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46 static PyObject *fpe_error;
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47 PyMODINIT_FUNC initfpetest(void);
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48 static PyObject *test(PyObject *self,PyObject *args);
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49 static double db0(double);
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50 static double overflow(double);
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51 static double nest1(int, double);
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52 static double nest2(int, double);
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53 static double nest3(double);
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54 static void printerr(double);
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55
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56 static PyMethodDef fpetest_methods[] = {
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57 {"test", (PyCFunction) test, METH_VARARGS},
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58 {0,0}
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59 };
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60
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61 static PyObject *test(PyObject *self,PyObject *args)
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62 {
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63 double r;
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64
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65 fprintf(stderr,"overflow");
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66 r = overflow(1.e160);
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67 printerr(r);
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68
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69 fprintf(stderr,"\ndiv by 0");
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70 r = db0(0.0);
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71 printerr(r);
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72
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73 fprintf(stderr,"\nnested outer");
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74 r = nest1(0, 0.0);
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75 printerr(r);
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76
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77 fprintf(stderr,"\nnested inner");
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78 r = nest1(1, 1.0);
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79 printerr(r);
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80
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81 fprintf(stderr,"\ntrailing outer");
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82 r = nest1(2, 2.0);
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83 printerr(r);
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84
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85 fprintf(stderr,"\nnested prior");
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86 r = nest2(0, 0.0);
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87 printerr(r);
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88
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89 fprintf(stderr,"\nnested interior");
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90 r = nest2(1, 1.0);
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91 printerr(r);
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92
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93 fprintf(stderr,"\nnested trailing");
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94 r = nest2(2, 2.0);
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95 printerr(r);
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96
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97 Py_INCREF (Py_None);
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98 return Py_None;
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99 }
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100
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101 static void printerr(double r)
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102 {
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103 if(r == 3.1416){
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104 fprintf(stderr,"\tPASS\n");
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105 PyErr_Print();
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106 }else{
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107 fprintf(stderr,"\tFAIL\n");
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108 }
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109 PyErr_Clear();
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110 }
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111
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112 static double nest1(int i, double x)
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113 {
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114 double a = 1.0;
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115
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116 PyFPE_START_PROTECT("Division by zero, outer zone", return 3.1416)
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117 if(i == 0){
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118 a = 1./x;
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119 }else if(i == 1){
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120 /* This (following) message is never seen. */
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121 PyFPE_START_PROTECT("Division by zero, inner zone", return 3.1416)
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122 a = 1./(1. - x);
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123 PyFPE_END_PROTECT(a)
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124 }else if(i == 2){
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125 a = 1./(2. - x);
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126 }
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127 PyFPE_END_PROTECT(a)
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128
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129 return a;
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130 }
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131
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132 static double nest2(int i, double x)
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133 {
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134 double a = 1.0;
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135 PyFPE_START_PROTECT("Division by zero, prior error", return 3.1416)
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136 if(i == 0){
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137 a = 1./x;
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138 }else if(i == 1){
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139 a = nest3(x);
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140 }else if(i == 2){
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141 a = 1./(2. - x);
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142 }
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143 PyFPE_END_PROTECT(a)
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144 return a;
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145 }
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146
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147 static double nest3(double x)
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148 {
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149 double result;
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150 /* This (following) message is never seen. */
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151 PyFPE_START_PROTECT("Division by zero, nest3 error", return 3.1416)
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152 result = 1./(1. - x);
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153 PyFPE_END_PROTECT(result)
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154 return result;
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155 }
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156
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157 static double db0(double x)
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158 {
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159 double a;
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160 PyFPE_START_PROTECT("Division by zero", return 3.1416)
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161 a = 1./x;
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162 PyFPE_END_PROTECT(a)
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163 return a;
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164 }
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165
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166 static double overflow(double b)
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167 {
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168 double a;
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169 PyFPE_START_PROTECT("Overflow", return 3.1416)
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170 a = b*b;
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171 PyFPE_END_PROTECT(a)
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172 return a;
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173 }
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174
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175 PyMODINIT_FUNC initfpetest(void)
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176 {
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177 PyObject *m, *d;
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178
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179 m = Py_InitModule("fpetest", fpetest_methods);
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180 if (m == NULL)
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181 return;
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182 d = PyModule_GetDict(m);
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183 fpe_error = PyErr_NewException("fpetest.error", NULL, NULL);
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184 if (fpe_error != NULL)
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185 PyDict_SetItemString(d, "error", fpe_error);
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186 }