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 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 ``` ``````use std use math use testr /* Note: a major part of the algorithms are the S constants. They are tested extensively in expm101 and expm102. */ const main = { math.fptrap(false) testr.run([ [.name="exp-01", .fn = exp01], [.name="exp-02", .fn = exp02], [.name="exp-03", .fn = exp03], [.name="exp-04", .fn = exp04], [.name="expm1-01", .fn = expm101], [.name="expm1-02", .fn = expm102], [.name="expm1-03", .fn = expm103], [.name="expm1-04", .fn = expm104], ][:]) } const exp01 = {c var inputs : (uint32, uint32)[:] = [ (0x00000000, 0x3f800000), (0x34000000, 0x3f800001), (0x3c000000, 0x3f810101), (0x42000000, 0x568fa1fe), (0xc2b00000, 0x0041edc4), (0xc2b20000, 0x001840fc), (0x7f7fffff, 0x7f800000), (0x7f800000, 0x7f800000), (0x7f800001, 0x7fc00000), (0xc2cff1b3, 0x00000001), (0xc2cff1b4, 0x00000001), (0xc2cff1b5, 0000000000), (0x42b17217, 0x7f7fff84), (0x42b17218, 0x7f800000), (0x42b17219, 0x7f800000), ][:] for (x, y) : inputs var xf : flt32 = std.flt32frombits(x) var yf : flt32 = std.flt32frombits(y) var rf = math.exp(xf) testr.check(c, rf == yf, "exp(0x{b=16,w=8,p=0}) should be 0x{b=16,w=8,p=0}, was 0x{b=16,w=8,p=0}", x, y, std.flt32bits(rf)) ;; } const exp02 = {c var inputs : (uint64, uint64)[:] = [ (0x0000000000000000, 0x3ff0000000000000), (0x3e50000000000000, 0x3ff0000004000000), ][:] for (x, y) : inputs var xf : flt64 = std.flt64frombits(x) var yf : flt64 = std.flt64frombits(y) var rf = math.exp(xf) testr.check(c, rf == yf, "exp(0x{b=16,w=16,p=0}) should be 0x{b=16,w=16,p=0}, was 0x{b=16,w=16,p=0}", x, y, std.flt64bits(rf)) ;; } const exp03 = {c /* Tang's algorithm has an error of up to 0.77 ulps. This is not terrible (musl appears to follow it, for example). Here we quarantine off some known-bad results. */ var inputs : (uint32, uint32, uint32)[:] = [ (0x42020000, 0x56eccf79, 0x56eccf78), (0x3ec40600, 0x3fbbb54b, 0x3fbbb54c), ][:] for (x, y_perfect, y_acceptable) : inputs var xf : flt32 = std.flt32frombits(x) var ypf : flt32 = std.flt32frombits(y_perfect) var yaf : flt32 = std.flt32frombits(y_acceptable) var rf = math.exp(xf) if rf != ypf && rf != yaf testr.fail(c, "exp(0x{b=16,w=8,p=0}) was 0x{b=16,w=8,p=0}. It should have been 0x{b=16,w=8,p=0}, although we will also accept 0x{b=16,w=8,p=0}", x, std.flt32bits(rf), y_perfect, y_acceptable) ;; ;; } const exp04 = {c /* Tang's algorithm has an error of up to 0.77 ulps. This is not terrible (musl appears to follow it, for example). Here we quarantine off some known-bad results. */ var inputs : (uint64, uint64, uint64)[:] = [ (0x3cda000000000000, 0x3ff0000000000006, 0x3ff0000000000007), (0x3d57020000000000, 0x3ff00000000005c0, 0x3ff00000000005c1), (0x3d58020000000000, 0x3ff0000000000600, 0x3ff0000000000601), (0xc087030000000000, 0x0000000000000c6d, 0x0000000000000c6e), (0xc011070000000000, 0x3f8d039e34c59187, 0x3f8d039e34c59186), (0xbd50070000000000, 0x3feffffffffff7fc, 0x3feffffffffff7fd), (0xbd430e0000000000, 0x3feffffffffffb3c, 0x3feffffffffffb3d), ][:] for (x, y_perfect, y_acceptable) : inputs var xf : flt64 = std.flt64frombits(x) var ypf : flt64 = std.flt64frombits(y_perfect) var yaf : flt64 = std.flt64frombits(y_acceptable) var rf = math.exp(xf) if rf != ypf && rf != yaf testr.fail(c, "exp(0x{b=16,w=16,p=0}) was 0x{b=16,w=16,p=0}. It should have been 0x{b=16,w=16,p=0}, although we will also accept 0x{b=16,w=16,p=0}", x, std.flt64bits(rf), y_perfect, y_acceptable) ;; ;; } const expm101 = {c var inputs : (uint32, uint32)[:] = [ (0x00000000, 0x00000000), (0x80000000, 0x80000000), (0x3f000000, 0x3f261299), (0x3c000000, 0x3c008056), (0x42000000, 0x568fa1fe), (0xc2b00000, 0xbf800000), (0xc2b20000, 0xbf800000), (0x01000000, 0x01000000), (0x40000000, 0x40cc7326), (0x42b17200, 0x7f7ff404), (0x415a3cf2, 0x494cd0e3), (0x7f800000, 0x7f800000), (0xff800000, 0xbf800000), (0x7a2028b1, 0x7f800000), (0xa201a23a, 0xa201a23a), (0xc0000000, 0xbf5d5aab), (0xbe934b10, 0xbe7fffff), (0xbe934b11, 0xbe800000), (0xbe934b12, 0xbe800001), (0x3e647fbe, 0x3e800000), (0x3e647fbf, 0x3e800000), (0x3e647fc0, 0x3e800001), (0xc0f744f5, 0xbf7fe31e), (0x4210297a, 0x597f31f5), /* J = 0 */ (0x3f34c3cd, 0x3f83573d), /* J = 1 */ (0x3f3a52b6, 0x3f89087b), /* J = 2 */ (0xbf20e72b, 0xbeeee940), /* ... */ (0x41f4bd2a, 0x558c999f), (0xc02a0418, 0xbf6e07cd), (0xc0293a2a, 0xbf6dcec1), (0x40b62779, 0x4393ca4b), (0x3fc680ac, 0x406dc6a4), (0x3fc9d2c6, 0x4075b516), (0xbfedd645, 0xbf581273), (0x3e70e5d1, 0x3e87cbdb), (0xbeddcacc, 0xbeb3ffd9), (0x3e8beb21, 0x3ea0e776), (0x3e9ded31, 0x3eb8fe1f), (0x40e8503c, 0x44b19ed8), (0x40d265cb, 0x4432f91f), (0xbea0f9bc, 0xbe8a2036), (0x3ec42672, 0x3eef04c4), (0xc140e8cc, 0xbf7fff9f), (0x4117320e, 0x46467e73), (0x3ee8b75d, 0x3f134ef0), (0xc03f51f1, 0xbf731e4e), (0x42733615, 0x6b52d3d4), (0x3f02f2b5, 0x3f2af617), (0xbf5ac925, 0xbf131660), (0x40813277, 0x425eb7ac), (0x41842e94, 0x4b64b1dd), (0x41b0ba81, 0x4f6a0cc1), (0xc061d7c2, 0xbf787d28), (0xc0611682, 0xbf786657), (0x40dcd7e9, 0x447827c5), /* J = 31 */ ][:] for (x, y) : inputs var xf : flt32 = std.flt32frombits(x) var yf : flt32 = std.flt32frombits(y) var rf = math.expm1(xf) testr.check(c, rf == yf, "expm1(0x{b=16,w=8,p=0}) should be 0x{b=16,w=8,p=0}, was 0x{b=16,w=8,p=0}", x, y, std.flt32bits(rf)) ;; } const expm102 = {c var inputs : (uint64, uint64)[:] = [ (0x0000000000000000, 0x0000000000000000), (0x404ef04831cb65ed, 0x45834ac37c44b3d3), (0x7ff0000000000000, 0x7ff0000000000000), (0xfff0000000000000, 0xbff0000000000000), (0x80318a89f290021a, 0x80318a89f290021a), (0xc0180881a9e73af6, 0xbfefebdcaf24d5fe), (0xc020cedaedb028c9, 0xbfeffe2a4ee5ba79), (0xbfe62812ff80cb9e, 0xbfdff9cf6758cc6a), /* J = 0 */ (0xbfe526dab7e5054c, 0xbfdef44fe4876d02), /* J = 1 */ (0x3ff6ea5c51cbf0f2, 0x400980f836e2c055), /* J = 2 */ (0x403f4315360b2cdc, 0x42c12ad5f692ffff), /* ... */ (0x3fe93f778a9dc013, 0x3ff3381168aca01e), (0x405023f373e01862, 0x45c1aa771de3ba9c), (0xbfff56366f3b92de, 0xbfeb7c693f8bdbb8), (0xc0159bcd07244a34, 0xbfefdb1461286124), (0x40079bbc23a67f90, 0x40322039bbbb5e2e), (0xbffe1933d2c0ed70, 0xbfeb1f6c166582bb), (0xc009ea7d09d84479, 0xbfeebf01fa92741c), (0x405d84f7563a2612, 0x4a946476fb27817e), (0x4045f770a45f8e7f, 0x43e4da111dae0dfb), (0x4070e9a83b352180, 0x585516d4e37bd9f6), (0x3fefcdb2a528c6e8, 0x3ffb39ec926d8a50), (0x3fd52b5e7995f00c, 0x3fd91739183464e0), (0xbfd625845bbaf98f, 0xbfd2b893d222b8f2), (0xbfd43c0407d114d5, 0xbfd15909a4bea38e), (0x3fd93f8288681821, 0x3fdef406a9f7c4b1), (0x3fdaad696fbfea76, 0x3fe08c8035acbd0b), (0x405e9b6f4b4bc7f3, 0x4af8b6ad079946a7), (0x3fdc85cf6b85bfaf, 0x3fe1f811193e5cf5), (0xbfed55f9b317d7eb, 0xbfe334b0378703a0), (0x406ee7f396a46c9b, 0x563a11333c75a10f), (0x4031266dc880810e, 0x417ac458c1525e64), (0xc019905c018b6d96, 0xbfeff243dffe774d), (0x404dc17e83d7ee6b, 0x454cfbf6572d627f), (0xc013dcd6fae06405, 0xbfefc6dfe34e5408), (0x402762d99fa5cfda, 0x40fd3b9a2004f68b), (0xbfe89074f132e353, 0xbfe12602fb3c9806), (0x4077c7ea24627ae7, 0x623ea61f88281bd5), (0xbff6a873237d8072, 0xbfe83c311800b6ee), /* J = 31 */ ][:] for (x, y) : inputs var xf : flt64 = std.flt64frombits(x) var yf : flt64 = std.flt64frombits(y) var rf = math.expm1(xf) testr.check(c, rf == yf, "expm1(0x{b=16,w=16,p=0}) should be 0x{b=16,w=16,p=0}, was 0x{b=16,w=16,p=0}", x, y, std.flt64bits(rf)) ;; } const expm103 = {c /* As with exp, there is some accepted error in expm1. */ var inputs : (uint32, uint32, uint32)[:] = [ (0x34000000, 0x34000001, 0x34000000), (0xbe651dea, 0xbe4d4b4d, 0xbe4d4b4c), ][:] for (x, y_perfect, y_acceptable) : inputs var xf : flt32 = std.flt32frombits(x) var ypf : flt32 = std.flt32frombits(y_perfect) var yaf : flt32 = std.flt32frombits(y_acceptable) var rf = math.expm1(xf) if rf != ypf && rf != yaf testr.fail(c, "expm1(0x{b=16,w=8,p=0}) was 0x{b=16,w=8,p=0}. It should have been 0x{b=16,w=8,p=0}, although we will also accept 0x{b=16,w=8,p=0}", x, std.flt32bits(rf), y_perfect, y_acceptable) ;; ;; } const expm104 = {c /* As with exp, there is some accepted error in expm1. */ var inputs : (uint64, uint64, uint64)[:] = [ (0xbf9d0b5aadc4d0ac, 0xbf9ca2e5b7bfa859, 0xbf9ca2e5b7bfa85a), (0x3fc2dbb101fe0392, 0x3fc451731cc0e358, 0x3fc451731cc0e359), (0x3fc8a39bc9c32fec, 0x3fcb2b988c3e0b2f, 0x3fcb2b988c3e0b30), ][:] for (x, y_perfect, y_acceptable) : inputs var xf : flt64 = std.flt64frombits(x) var ypf : flt64 = std.flt64frombits(y_perfect) var yaf : flt64 = std.flt64frombits(y_acceptable) var rf = math.expm1(xf) if rf != ypf && rf != yaf testr.fail(c, "expm1(0x{b=16,w=16,p=0}) was 0x{b=16,w=16,p=0}. It should have been 0x{b=16,w=16,p=0}, although we will also accept 0x{b=16,w=16,p=0}", x, std.flt64bits(rf), y_perfect, y_acceptable) ;; ;; } ``````