| 1 | const std = @import("std"); |
| 2 | const testing = std.testing; |
| 3 | |
| 4 | const compiler_rt = @import("../compiler_rt.zig"); |
| 5 | |
| 6 | const print = std.debug.print; |
| 7 | |
| 8 | fn test__negsi2(a: i32, expected: i32) !void { |
| 9 | const result = compiler_rt.__negsi2(a); |
| 10 | try testing.expectEqual(expected, result); |
| 11 | } |
| 12 | |
| 13 | test "negsi2" { |
| 14 | // TODO ensuring that math.minInt(i32); returns error |
| 15 | |
| 16 | try test__negsi2(-3, 3); |
| 17 | try test__negsi2(-2, 2); |
| 18 | try test__negsi2(-1, 1); |
| 19 | try test__negsi2(0, 0); // special case for 2s complement |
| 20 | try test__negsi2(1, -1); |
| 21 | try test__negsi2(2, -2); |
| 22 | try test__negsi2(3, -3); |
| 23 | |
| 24 | // max_usable == MAX(i32) == -MIN(i32) == 2147483647 == 7fffffff |
| 25 | // divTrunc: max_usable / i, i=1,2,3,5,100 |
| 26 | // 7fffffff / i |
| 27 | try test__negsi2(-715827882, 715827882); |
| 28 | try test__negsi2(715827882, -715827882); |
| 29 | try test__negsi2(-429496729, 429496729); |
| 30 | try test__negsi2(429496729, -429496729); |
| 31 | try test__negsi2(-214748364, 214748364); |
| 32 | try test__negsi2(214748364, -214748364); |
| 33 | // shifting: max_usable >> i, i=0..bitsize-4 |
| 34 | // 7fffffff >> i |
| 35 | // 7fffffff >> i + 1 |
| 36 | // 7fffffff >> i + 3 |
| 37 | // 7fffffff >> i + 7 |
| 38 | try test__negsi2(-2147483647, 2147483647); |
| 39 | try test__negsi2(2147483647, -2147483647); |
| 40 | try test__negsi2(-2147483646, 2147483646); |
| 41 | try test__negsi2(2147483646, -2147483646); |
| 42 | try test__negsi2(-2147483644, 2147483644); |
| 43 | try test__negsi2(2147483644, -2147483644); |
| 44 | try test__negsi2(-2147483640, 2147483640); |
| 45 | try test__negsi2(2147483640, -2147483640); |
| 46 | try test__negsi2(-1073741823, 1073741823); |
| 47 | try test__negsi2(1073741823, -1073741823); |
| 48 | try test__negsi2(-1073741822, 1073741822); |
| 49 | try test__negsi2(1073741822, -1073741822); |
| 50 | try test__negsi2(-1073741820, 1073741820); |
| 51 | try test__negsi2(1073741820, -1073741820); |
| 52 | try test__negsi2(-1073741816, 1073741816); |
| 53 | try test__negsi2(1073741816, -1073741816); |
| 54 | try test__negsi2(-536870911, 536870911); |
| 55 | try test__negsi2(536870911, -536870911); |
| 56 | try test__negsi2(-536870910, 536870910); |
| 57 | try test__negsi2(536870910, -536870910); |
| 58 | try test__negsi2(-536870908, 536870908); |
| 59 | try test__negsi2(536870908, -536870908); |
| 60 | try test__negsi2(-536870904, 536870904); |
| 61 | try test__negsi2(536870904, -536870904); |
| 62 | try test__negsi2(-268435455, 268435455); |
| 63 | try test__negsi2(268435455, -268435455); |
| 64 | try test__negsi2(-268435454, 268435454); |
| 65 | try test__negsi2(268435454, -268435454); |
| 66 | try test__negsi2(-268435452, 268435452); |
| 67 | try test__negsi2(268435452, -268435452); |
| 68 | try test__negsi2(-268435448, 268435448); |
| 69 | try test__negsi2(268435448, -268435448); |
| 70 | try test__negsi2(-134217727, 134217727); |
| 71 | try test__negsi2(134217727, -134217727); |
| 72 | try test__negsi2(-134217726, 134217726); |
| 73 | try test__negsi2(134217726, -134217726); |
| 74 | try test__negsi2(-134217724, 134217724); |
| 75 | try test__negsi2(134217724, -134217724); |
| 76 | try test__negsi2(-134217720, 134217720); |
| 77 | try test__negsi2(134217720, -134217720); |
| 78 | try test__negsi2(-67108863, 67108863); |
| 79 | try test__negsi2(67108863, -67108863); |
| 80 | try test__negsi2(-67108862, 67108862); |
| 81 | try test__negsi2(67108862, -67108862); |
| 82 | try test__negsi2(-67108860, 67108860); |
| 83 | try test__negsi2(67108860, -67108860); |
| 84 | try test__negsi2(-67108856, 67108856); |
| 85 | try test__negsi2(67108856, -67108856); |
| 86 | try test__negsi2(-33554431, 33554431); |
| 87 | try test__negsi2(33554431, -33554431); |
| 88 | try test__negsi2(-33554430, 33554430); |
| 89 | try test__negsi2(33554430, -33554430); |
| 90 | try test__negsi2(-33554428, 33554428); |
| 91 | try test__negsi2(33554428, -33554428); |
| 92 | try test__negsi2(-33554424, 33554424); |
| 93 | try test__negsi2(33554424, -33554424); |
| 94 | try test__negsi2(-16777215, 16777215); |
| 95 | try test__negsi2(16777215, -16777215); |
| 96 | try test__negsi2(-16777214, 16777214); |
| 97 | try test__negsi2(16777214, -16777214); |
| 98 | try test__negsi2(-16777212, 16777212); |
| 99 | try test__negsi2(16777212, -16777212); |
| 100 | try test__negsi2(-16777208, 16777208); |
| 101 | try test__negsi2(16777208, -16777208); |
| 102 | try test__negsi2(-8388607, 8388607); |
| 103 | try test__negsi2(8388607, -8388607); |
| 104 | try test__negsi2(-8388606, 8388606); |
| 105 | try test__negsi2(8388606, -8388606); |
| 106 | try test__negsi2(-8388604, 8388604); |
| 107 | try test__negsi2(8388604, -8388604); |
| 108 | try test__negsi2(-8388600, 8388600); |
| 109 | try test__negsi2(8388600, -8388600); |
| 110 | try test__negsi2(-4194303, 4194303); |
| 111 | try test__negsi2(4194303, -4194303); |
| 112 | try test__negsi2(-4194302, 4194302); |
| 113 | try test__negsi2(4194302, -4194302); |
| 114 | try test__negsi2(-4194300, 4194300); |
| 115 | try test__negsi2(4194300, -4194300); |
| 116 | try test__negsi2(-4194296, 4194296); |
| 117 | try test__negsi2(4194296, -4194296); |
| 118 | try test__negsi2(-2097151, 2097151); |
| 119 | try test__negsi2(2097151, -2097151); |
| 120 | try test__negsi2(-2097150, 2097150); |
| 121 | try test__negsi2(2097150, -2097150); |
| 122 | try test__negsi2(-2097148, 2097148); |
| 123 | try test__negsi2(2097148, -2097148); |
| 124 | try test__negsi2(-2097144, 2097144); |
| 125 | try test__negsi2(2097144, -2097144); |
| 126 | try test__negsi2(-1048575, 1048575); |
| 127 | try test__negsi2(1048575, -1048575); |
| 128 | try test__negsi2(-1048574, 1048574); |
| 129 | try test__negsi2(1048574, -1048574); |
| 130 | try test__negsi2(-1048572, 1048572); |
| 131 | try test__negsi2(1048572, -1048572); |
| 132 | try test__negsi2(-1048568, 1048568); |
| 133 | try test__negsi2(1048568, -1048568); |
| 134 | try test__negsi2(-524287, 524287); |
| 135 | try test__negsi2(524287, -524287); |
| 136 | try test__negsi2(-524286, 524286); |
| 137 | try test__negsi2(524286, -524286); |
| 138 | try test__negsi2(-524284, 524284); |
| 139 | try test__negsi2(524284, -524284); |
| 140 | try test__negsi2(-524280, 524280); |
| 141 | try test__negsi2(524280, -524280); |
| 142 | try test__negsi2(-262143, 262143); |
| 143 | try test__negsi2(262143, -262143); |
| 144 | try test__negsi2(-262142, 262142); |
| 145 | try test__negsi2(262142, -262142); |
| 146 | try test__negsi2(-262140, 262140); |
| 147 | try test__negsi2(262140, -262140); |
| 148 | try test__negsi2(-262136, 262136); |
| 149 | try test__negsi2(262136, -262136); |
| 150 | try test__negsi2(-131071, 131071); |
| 151 | try test__negsi2(131071, -131071); |
| 152 | try test__negsi2(-131070, 131070); |
| 153 | try test__negsi2(131070, -131070); |
| 154 | try test__negsi2(-131068, 131068); |
| 155 | try test__negsi2(131068, -131068); |
| 156 | try test__negsi2(-131064, 131064); |
| 157 | try test__negsi2(131064, -131064); |
| 158 | try test__negsi2(-65535, 65535); |
| 159 | try test__negsi2(65535, -65535); |
| 160 | try test__negsi2(-65534, 65534); |
| 161 | try test__negsi2(65534, -65534); |
| 162 | try test__negsi2(-65532, 65532); |
| 163 | try test__negsi2(65532, -65532); |
| 164 | try test__negsi2(-65528, 65528); |
| 165 | try test__negsi2(65528, -65528); |
| 166 | try test__negsi2(-32767, 32767); |
| 167 | try test__negsi2(32767, -32767); |
| 168 | try test__negsi2(-32766, 32766); |
| 169 | try test__negsi2(32766, -32766); |
| 170 | try test__negsi2(-32764, 32764); |
| 171 | try test__negsi2(32764, -32764); |
| 172 | try test__negsi2(-32760, 32760); |
| 173 | try test__negsi2(32760, -32760); |
| 174 | try test__negsi2(-16383, 16383); |
| 175 | try test__negsi2(16383, -16383); |
| 176 | try test__negsi2(-16382, 16382); |
| 177 | try test__negsi2(16382, -16382); |
| 178 | try test__negsi2(-16380, 16380); |
| 179 | try test__negsi2(16380, -16380); |
| 180 | try test__negsi2(-16376, 16376); |
| 181 | try test__negsi2(16376, -16376); |
| 182 | try test__negsi2(-8191, 8191); |
| 183 | try test__negsi2(8191, -8191); |
| 184 | try test__negsi2(-8190, 8190); |
| 185 | try test__negsi2(8190, -8190); |
| 186 | try test__negsi2(-8188, 8188); |
| 187 | try test__negsi2(8188, -8188); |
| 188 | try test__negsi2(-8184, 8184); |
| 189 | try test__negsi2(8184, -8184); |
| 190 | try test__negsi2(-4095, 4095); |
| 191 | try test__negsi2(4095, -4095); |
| 192 | try test__negsi2(-4094, 4094); |
| 193 | try test__negsi2(4094, -4094); |
| 194 | try test__negsi2(-4092, 4092); |
| 195 | try test__negsi2(4092, -4092); |
| 196 | try test__negsi2(-4088, 4088); |
| 197 | try test__negsi2(4088, -4088); |
| 198 | try test__negsi2(-2047, 2047); |
| 199 | try test__negsi2(2047, -2047); |
| 200 | try test__negsi2(-2046, 2046); |
| 201 | try test__negsi2(2046, -2046); |
| 202 | try test__negsi2(-2044, 2044); |
| 203 | try test__negsi2(2044, -2044); |
| 204 | try test__negsi2(-2040, 2040); |
| 205 | try test__negsi2(2040, -2040); |
| 206 | try test__negsi2(-1023, 1023); |
| 207 | try test__negsi2(1023, -1023); |
| 208 | try test__negsi2(-1022, 1022); |
| 209 | try test__negsi2(1022, -1022); |
| 210 | try test__negsi2(-1020, 1020); |
| 211 | try test__negsi2(1020, -1020); |
| 212 | try test__negsi2(-1016, 1016); |
| 213 | try test__negsi2(1016, -1016); |
| 214 | try test__negsi2(-511, 511); |
| 215 | try test__negsi2(511, -511); |
| 216 | try test__negsi2(-510, 510); |
| 217 | try test__negsi2(510, -510); |
| 218 | try test__negsi2(-508, 508); |
| 219 | try test__negsi2(508, -508); |
| 220 | try test__negsi2(-504, 504); |
| 221 | try test__negsi2(504, -504); |
| 222 | try test__negsi2(-255, 255); |
| 223 | try test__negsi2(255, -255); |
| 224 | try test__negsi2(-254, 254); |
| 225 | try test__negsi2(254, -254); |
| 226 | try test__negsi2(-252, 252); |
| 227 | try test__negsi2(252, -252); |
| 228 | try test__negsi2(-248, 248); |
| 229 | try test__negsi2(248, -248); |
| 230 | try test__negsi2(-127, 127); |
| 231 | try test__negsi2(127, -127); |
| 232 | try test__negsi2(-126, 126); |
| 233 | try test__negsi2(126, -126); |
| 234 | try test__negsi2(-124, 124); |
| 235 | try test__negsi2(124, -124); |
| 236 | try test__negsi2(-120, 120); |
| 237 | try test__negsi2(120, -120); |
| 238 | try test__negsi2(-63, 63); |
| 239 | try test__negsi2(63, -63); |
| 240 | try test__negsi2(-62, 62); |
| 241 | try test__negsi2(62, -62); |
| 242 | try test__negsi2(-60, 60); |
| 243 | try test__negsi2(60, -60); |
| 244 | try test__negsi2(-56, 56); |
| 245 | try test__negsi2(56, -56); |
| 246 | try test__negsi2(-31, 31); |
| 247 | try test__negsi2(31, -31); |
| 248 | try test__negsi2(-30, 30); |
| 249 | try test__negsi2(30, -30); |
| 250 | try test__negsi2(-28, 28); |
| 251 | try test__negsi2(28, -28); |
| 252 | try test__negsi2(-24, 24); |
| 253 | try test__negsi2(24, -24); |
| 254 | try test__negsi2(-15, 15); |
| 255 | try test__negsi2(15, -15); |
| 256 | try test__negsi2(-14, 14); |
| 257 | try test__negsi2(14, -14); |
| 258 | try test__negsi2(-12, 12); |
| 259 | try test__negsi2(12, -12); |
| 260 | try test__negsi2(-8, 8); |
| 261 | try test__negsi2(8, -8); |
| 262 | } |