1 | // |
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2 | // Lol Engine |
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3 | // |
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4 | // Copyright: (c) 2010-2011 Sam Hocevar <sam@hocevar.net> |
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5 | // This program is free software; you can redistribute it and/or |
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6 | // modify it under the terms of the Do What The Fuck You Want To |
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7 | // Public License, Version 2, as published by Sam Hocevar. See |
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8 | // http://sam.zoy.org/projects/COPYING.WTFPL for more details. |
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9 | // |
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10 | |
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11 | #if defined HAVE_CONFIG_H |
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12 | # include "config.h" |
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13 | #endif |
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14 | |
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15 | #include <cmath> |
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16 | |
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17 | #include "core.h" |
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18 | #include "lol/unit.h" |
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19 | |
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20 | /* Ensure isnan() is present even on systems that don't define it, or |
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21 | * when -ffast-math is being used. */ |
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22 | #if defined __FAST_MATH__ |
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23 | # undef isnan |
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24 | #endif |
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25 | #if !defined isnan |
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26 | static inline int isnan(float f) |
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27 | { |
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28 | union { float f; uint32_t x; } u = { f }; |
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29 | return (u.x << 1) > 0xff000000u; |
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30 | } |
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31 | #endif |
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32 | |
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33 | namespace lol |
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34 | { |
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35 | |
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36 | LOLUNIT_FIXTURE(HalfTest) |
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37 | { |
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38 | public: |
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39 | void setUp() {} |
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40 | void tearDown() {} |
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41 | |
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42 | LOLUNIT_TEST(test_half_from_float) |
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43 | { |
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44 | for (size_t i = 0; i < sizeof(pairs) / sizeof(*pairs); i++) |
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45 | { |
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46 | half a = (half)pairs[i].f; |
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47 | uint16_t b = pairs[i].x; |
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48 | LOLUNIT_ASSERT_EQUAL(a.bits, b); |
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49 | } |
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50 | } |
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51 | |
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52 | LOLUNIT_TEST(test_half_makeaccurate) |
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53 | { |
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54 | for (size_t i = 0; i < sizeof(pairs) / sizeof(*pairs); i++) |
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55 | { |
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56 | half a = half::makeaccurate(pairs[i].f); |
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57 | uint16_t b = pairs[i].x; |
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58 | LOLUNIT_ASSERT_EQUAL(a.bits, b); |
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59 | } |
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60 | } |
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61 | |
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62 | LOLUNIT_TEST(test_half_makebits) |
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63 | { |
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64 | for (unsigned int i = 0; i < 0x10000; i++) |
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65 | { |
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66 | half a = half::makebits(i); |
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67 | uint16_t b = i; |
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68 | LOLUNIT_ASSERT_EQUAL(a.bits, b); |
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69 | } |
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70 | } |
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71 | |
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72 | LOLUNIT_TEST(test_half_is_nan) |
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73 | { |
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74 | LOLUNIT_ASSERT(half::makebits(0x7c01).is_nan()); |
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75 | LOLUNIT_ASSERT(half::makebits(0xfc01).is_nan()); |
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76 | LOLUNIT_ASSERT(half::makebits(0x7e00).is_nan()); |
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77 | LOLUNIT_ASSERT(half::makebits(0xfe00).is_nan()); |
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78 | |
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79 | LOLUNIT_ASSERT(!half::makebits(0x7c00).is_nan()); |
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80 | LOLUNIT_ASSERT(!half::makebits(0xfc00).is_nan()); |
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81 | |
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82 | LOLUNIT_ASSERT(!half(0.0f).is_nan()); |
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83 | LOLUNIT_ASSERT(!half(-0.0f).is_nan()); |
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84 | LOLUNIT_ASSERT(!half(2.0f).is_nan()); |
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85 | LOLUNIT_ASSERT(!half(-2.0f).is_nan()); |
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86 | } |
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87 | |
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88 | LOLUNIT_TEST(test_half_is_inf) |
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89 | { |
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90 | LOLUNIT_ASSERT(half(65536.0f).is_inf()); |
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91 | LOLUNIT_ASSERT(half(-65536.0f).is_inf()); |
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92 | |
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93 | LOLUNIT_ASSERT(!half(0.0f).is_inf()); |
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94 | LOLUNIT_ASSERT(!half(-0.0f).is_inf()); |
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95 | LOLUNIT_ASSERT(!half(65535.0f).is_inf()); |
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96 | LOLUNIT_ASSERT(!half(-65535.0f).is_inf()); |
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97 | |
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98 | LOLUNIT_ASSERT(half::makebits(0x7c00).is_inf()); |
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99 | LOLUNIT_ASSERT(half::makebits(0xfc00).is_inf()); |
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100 | |
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101 | LOLUNIT_ASSERT(!half::makebits(0x7e00).is_inf()); |
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102 | LOLUNIT_ASSERT(!half::makebits(0xfe00).is_inf()); |
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103 | } |
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104 | |
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105 | LOLUNIT_TEST(test_half_is_finite) |
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106 | { |
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107 | LOLUNIT_ASSERT(half(0.0f).is_finite()); |
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108 | LOLUNIT_ASSERT(half(-0.0f).is_finite()); |
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109 | LOLUNIT_ASSERT(half(65535.0f).is_finite()); |
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110 | LOLUNIT_ASSERT(half(-65535.0f).is_finite()); |
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111 | |
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112 | LOLUNIT_ASSERT(!half(65536.0f).is_finite()); |
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113 | LOLUNIT_ASSERT(!half(-65536.0f).is_finite()); |
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114 | |
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115 | LOLUNIT_ASSERT(!half::makebits(0x7c00).is_finite()); |
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116 | LOLUNIT_ASSERT(!half::makebits(0xfc00).is_finite()); |
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117 | |
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118 | LOLUNIT_ASSERT(!half::makebits(0x7e00).is_finite()); |
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119 | LOLUNIT_ASSERT(!half::makebits(0xfe00).is_finite()); |
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120 | } |
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121 | |
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122 | LOLUNIT_TEST(test_half_is_normal) |
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123 | { |
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124 | LOLUNIT_ASSERT(half(0.0f).is_normal()); |
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125 | LOLUNIT_ASSERT(half(-0.0f).is_normal()); |
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126 | LOLUNIT_ASSERT(half(65535.0f).is_normal()); |
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127 | LOLUNIT_ASSERT(half(-65535.0f).is_normal()); |
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128 | |
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129 | LOLUNIT_ASSERT(!half(65536.0f).is_normal()); |
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130 | LOLUNIT_ASSERT(!half(-65536.0f).is_normal()); |
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131 | |
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132 | LOLUNIT_ASSERT(!half::makebits(0x7c00).is_normal()); |
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133 | LOLUNIT_ASSERT(!half::makebits(0xfc00).is_normal()); |
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134 | |
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135 | LOLUNIT_ASSERT(!half::makebits(0x7e00).is_normal()); |
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136 | LOLUNIT_ASSERT(!half::makebits(0xfe00).is_normal()); |
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137 | } |
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138 | |
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139 | LOLUNIT_TEST(test_half_classify) |
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140 | { |
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141 | for (uint32_t i = 0; i < 0x10000; i++) |
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142 | { |
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143 | half h = half::makebits(i); |
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144 | if (h.is_nan()) |
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145 | { |
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146 | LOLUNIT_ASSERT(!h.is_inf()); |
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147 | LOLUNIT_ASSERT(!h.is_normal()); |
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148 | LOLUNIT_ASSERT(!h.is_finite()); |
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149 | } |
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150 | else if (h.is_inf()) |
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151 | { |
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152 | LOLUNIT_ASSERT(!h.is_normal()); |
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153 | LOLUNIT_ASSERT(!h.is_finite()); |
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154 | } |
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155 | else |
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156 | { |
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157 | LOLUNIT_ASSERT(h.is_finite()); |
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158 | } |
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159 | } |
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160 | } |
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161 | |
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162 | LOLUNIT_TEST(test_half_to_float) |
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163 | { |
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164 | for (size_t i = 0; i < sizeof(pairs) / sizeof(*pairs); i++) |
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165 | { |
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166 | float a = (float)half::makebits(pairs[i].x); |
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167 | float b = pairs[i].f; |
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168 | LOLUNIT_ASSERT_EQUAL(a, b); |
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169 | } |
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170 | |
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171 | for (uint32_t i = 0; i < 0x10000; i++) |
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172 | { |
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173 | half h = half::makebits(i); |
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174 | float f = (float)h; |
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175 | half g = (half)f; |
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176 | if (h.is_nan()) |
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177 | { |
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178 | LOLUNIT_ASSERT(isnan(f)); |
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179 | LOLUNIT_ASSERT(g.is_nan()); |
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180 | } |
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181 | else |
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182 | { |
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183 | LOLUNIT_ASSERT(!isnan(f)); |
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184 | LOLUNIT_ASSERT_EQUAL(g.bits, h.bits); |
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185 | } |
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186 | } |
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187 | } |
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188 | |
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189 | LOLUNIT_TEST(test_half_to_int) |
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190 | { |
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191 | LOLUNIT_ASSERT_EQUAL((int)(half)(0.0f), 0); |
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192 | LOLUNIT_ASSERT_EQUAL((int)(half)(-0.0f), 0); |
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193 | LOLUNIT_ASSERT_EQUAL((int)(half)(0.9f), 0); |
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194 | LOLUNIT_ASSERT_EQUAL((int)(half)(-0.9f), 0); |
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195 | LOLUNIT_ASSERT_EQUAL((int)(half)(1.0f), 1); |
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196 | LOLUNIT_ASSERT_EQUAL((int)(half)(-1.0f), -1); |
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197 | LOLUNIT_ASSERT_EQUAL((int)(half)(1.9f), 1); |
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198 | LOLUNIT_ASSERT_EQUAL((int)(half)(-1.9f), -1); |
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199 | LOLUNIT_ASSERT_EQUAL((int)(half)(65504.0f), 65504); |
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200 | LOLUNIT_ASSERT_EQUAL((int)(half)(-65504.0f), -65504); |
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201 | } |
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202 | |
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203 | LOLUNIT_TEST(test_float_op_half) |
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204 | { |
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205 | half zero = 0; |
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206 | half one = 1; |
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207 | half two = 2; |
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208 | |
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209 | float a = zero + one; |
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210 | LOLUNIT_ASSERT_EQUAL(1.0f, a); |
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211 | a += zero; |
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212 | LOLUNIT_ASSERT_EQUAL(1.0f, a); |
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213 | a -= zero; |
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214 | LOLUNIT_ASSERT_EQUAL(1.0f, a); |
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215 | a *= one; |
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216 | LOLUNIT_ASSERT_EQUAL(1.0f, a); |
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217 | a /= one; |
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218 | LOLUNIT_ASSERT_EQUAL(1.0f, a); |
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219 | |
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220 | float b = one + zero; |
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221 | LOLUNIT_ASSERT_EQUAL(1.0f, b); |
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222 | b += one; |
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223 | LOLUNIT_ASSERT_EQUAL(2.0f, b); |
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224 | b *= two; |
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225 | LOLUNIT_ASSERT_EQUAL(4.0f, b); |
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226 | b -= two; |
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227 | LOLUNIT_ASSERT_EQUAL(2.0f, b); |
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228 | b /= two; |
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229 | LOLUNIT_ASSERT_EQUAL(1.0f, b); |
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230 | |
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231 | float c = one - zero; |
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232 | LOLUNIT_ASSERT_EQUAL(1.0f, c); |
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233 | |
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234 | float d = two - one; |
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235 | LOLUNIT_ASSERT_EQUAL(1.0f, d); |
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236 | |
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237 | float e = two + (-one); |
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238 | LOLUNIT_ASSERT_EQUAL(1.0f, e); |
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239 | |
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240 | float f = (two * two) / (one + one); |
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241 | LOLUNIT_ASSERT_EQUAL(2.0f, f); |
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242 | } |
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243 | |
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244 | LOLUNIT_TEST(test_half_op_float) |
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245 | { |
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246 | half zero = 0; |
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247 | half one = 1; |
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248 | half two = 2; |
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249 | half four = 4; |
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250 | |
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251 | half a = one + 0.0f; |
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252 | LOLUNIT_ASSERT_EQUAL(one.bits, a.bits); |
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253 | a += 0.0f; |
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254 | LOLUNIT_ASSERT_EQUAL(one.bits, a.bits); |
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255 | a -= 0.0f; |
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256 | LOLUNIT_ASSERT_EQUAL(one.bits, a.bits); |
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257 | a *= 1.0f; |
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258 | LOLUNIT_ASSERT_EQUAL(one.bits, a.bits); |
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259 | a /= 1.0f; |
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260 | LOLUNIT_ASSERT_EQUAL(one.bits, a.bits); |
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261 | |
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262 | half b = one + 0.0f; |
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263 | LOLUNIT_ASSERT_EQUAL(one.bits, b.bits); |
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264 | b += 1.0f; |
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265 | LOLUNIT_ASSERT_EQUAL(two.bits, b.bits); |
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266 | b *= 2.0f; |
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267 | LOLUNIT_ASSERT_EQUAL(four.bits, b.bits); |
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268 | b -= 2.0f; |
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269 | LOLUNIT_ASSERT_EQUAL(two.bits, b.bits); |
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270 | b /= 2.0f; |
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271 | LOLUNIT_ASSERT_EQUAL(one.bits, b.bits); |
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272 | |
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273 | half c = 1.0f - zero; |
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274 | LOLUNIT_ASSERT_EQUAL(one.bits, c.bits); |
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275 | |
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276 | half d = 2.0f - one; |
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277 | LOLUNIT_ASSERT_EQUAL(one.bits, d.bits); |
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278 | |
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279 | half e = 2.0f + (-one); |
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280 | LOLUNIT_ASSERT_EQUAL(one.bits, e.bits); |
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281 | |
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282 | half f = (2.0f * two) / (1.0f + one); |
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283 | LOLUNIT_ASSERT_EQUAL(two.bits, f.bits); |
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284 | } |
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285 | |
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286 | private: |
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287 | struct TestPair { float f; uint16_t x; }; |
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288 | |
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289 | static TestPair const pairs[11]; |
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290 | }; |
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291 | |
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292 | HalfTest::TestPair const HalfTest::pairs[] = |
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293 | { |
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294 | /* All these values have exact half representations */ |
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295 | { 0.0f, 0x0000 }, |
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296 | { -0.0f, 0x8000 }, /* negative zero */ |
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297 | { 1.0f, 0x3c00 }, |
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298 | { -1.0f, 0xbc00 }, |
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299 | { 2.0f, 0x4000 }, |
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300 | { 0.5f, 0x3800 }, |
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301 | { 0.125f, 0x3000 }, |
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302 | { 15.9375f, 0x4bf8 }, |
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303 | { 31.0f / (1 << 14), 0x17c0 }, /* 0x1.fp-10 */ |
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304 | { 31.0f / (1 << 18), 0x07c0 }, /* 0x1.fp-14, denormal */ |
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305 | { 31.0f / (1 << 19), 0x03e0 }, /* 0x1.fp-15, denormal */ |
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306 | }; |
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307 | |
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308 | } /* namespace lol */ |
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309 | |
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