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//usr/local/lib/python3.9/test/decimaltestdata/ddLogB.decTest
------------------------------------------------------------------------ -- ddLogB.decTest -- integral 754r adjusted exponent, for decDoubles -- -- Copyright (c) IBM Corporation, 2005, 2008. All rights reserved. -- ------------------------------------------------------------------------ -- Please see the document "General Decimal Arithmetic Testcases" -- -- at http://www2.hursley.ibm.com/decimal for the description of -- -- these testcases. -- -- -- -- These testcases are experimental ('beta' versions), and they -- -- may contain errors. They are offered on an as-is basis. In -- -- particular, achieving the same results as the tests here is not -- -- a guarantee that an implementation complies with any Standard -- -- or specification. The tests are not exhaustive. -- -- -- -- Please send comments, suggestions, and corrections to the author: -- -- Mike Cowlishaw, IBM Fellow -- -- IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK -- -- mfc@uk.ibm.com -- ------------------------------------------------------------------------ version: 2.59 precision: 16 maxExponent: 384 minExponent: -383 extended: 1 clamp: 1 rounding: half_even -- basics ddlogb000 logb 0 -> -Infinity Division_by_zero ddlogb001 logb 1E-398 -> -398 ddlogb002 logb 1E-383 -> -383 ddlogb003 logb 0.001 -> -3 ddlogb004 logb 0.03 -> -2 ddlogb005 logb 1 -> 0 ddlogb006 logb 2 -> 0 ddlogb007 logb 2.5 -> 0 ddlogb008 logb 2.500 -> 0 ddlogb009 logb 10 -> 1 ddlogb010 logb 70 -> 1 ddlogb011 logb 100 -> 2 ddlogb012 logb 333 -> 2 ddlogb013 logb 9E+384 -> 384 ddlogb014 logb +Infinity -> Infinity -- negatives appear to be treated as positives ddlogb021 logb -0 -> -Infinity Division_by_zero ddlogb022 logb -1E-398 -> -398 ddlogb023 logb -9E-383 -> -383 ddlogb024 logb -0.001 -> -3 ddlogb025 logb -1 -> 0 ddlogb026 logb -2 -> 0 ddlogb027 logb -10 -> 1 ddlogb028 logb -70 -> 1 ddlogb029 logb -100 -> 2 ddlogb030 logb -9E+384 -> 384 ddlogb031 logb -Infinity -> Infinity -- zeros ddlogb111 logb 0 -> -Infinity Division_by_zero ddlogb112 logb -0 -> -Infinity Division_by_zero ddlogb113 logb 0E+4 -> -Infinity Division_by_zero ddlogb114 logb -0E+4 -> -Infinity Division_by_zero ddlogb115 logb 0.0000 -> -Infinity Division_by_zero ddlogb116 logb -0.0000 -> -Infinity Division_by_zero ddlogb117 logb 0E-141 -> -Infinity Division_by_zero ddlogb118 logb -0E-141 -> -Infinity Division_by_zero -- full coefficients, alternating bits ddlogb121 logb 268268268 -> 8 ddlogb122 logb -268268268 -> 8 ddlogb123 logb 134134134 -> 8 ddlogb124 logb -134134134 -> 8 -- Nmax, Nmin, Ntiny ddlogb131 logb 9.999999999999999E+384 -> 384 ddlogb132 logb 1E-383 -> -383 ddlogb133 logb 1.000000000000000E-383 -> -383 ddlogb134 logb 1E-398 -> -398 ddlogb135 logb -1E-398 -> -398 ddlogb136 logb -1.000000000000000E-383 -> -383 ddlogb137 logb -1E-383 -> -383 ddlogb138 logb -9.999999999999999E+384 -> 384 -- ones ddlogb0061 logb 1 -> 0 ddlogb0062 logb 1.0 -> 0 ddlogb0063 logb 1.000000000000000 -> 0 -- notable cases -- exact powers of 10 ddlogb1100 logb 1 -> 0 ddlogb1101 logb 10 -> 1 ddlogb1102 logb 100 -> 2 ddlogb1103 logb 1000 -> 3 ddlogb1104 logb 10000 -> 4 ddlogb1105 logb 100000 -> 5 ddlogb1106 logb 1000000 -> 6 ddlogb1107 logb 10000000 -> 7 ddlogb1108 logb 100000000 -> 8 ddlogb1109 logb 1000000000 -> 9 ddlogb1110 logb 10000000000 -> 10 ddlogb1111 logb 100000000000 -> 11 ddlogb1112 logb 1000000000000 -> 12 ddlogb1113 logb 0.00000000001 -> -11 ddlogb1114 logb 0.0000000001 -> -10 ddlogb1115 logb 0.000000001 -> -9 ddlogb1116 logb 0.00000001 -> -8 ddlogb1117 logb 0.0000001 -> -7 ddlogb1118 logb 0.000001 -> -6 ddlogb1119 logb 0.00001 -> -5 ddlogb1120 logb 0.0001 -> -4 ddlogb1121 logb 0.001 -> -3 ddlogb1122 logb 0.01 -> -2 ddlogb1123 logb 0.1 -> -1 ddlogb1124 logb 1E-99 -> -99 ddlogb1125 logb 1E-100 -> -100 ddlogb1127 logb 1E-299 -> -299 ddlogb1126 logb 1E-383 -> -383 -- suggestions from Ilan Nehama ddlogb1400 logb 10E-3 -> -2 ddlogb1401 logb 10E-2 -> -1 ddlogb1402 logb 100E-2 -> 0 ddlogb1403 logb 1000E-2 -> 1 ddlogb1404 logb 10000E-2 -> 2 ddlogb1405 logb 10E-1 -> 0 ddlogb1406 logb 100E-1 -> 1 ddlogb1407 logb 1000E-1 -> 2 ddlogb1408 logb 10000E-1 -> 3 ddlogb1409 logb 10E0 -> 1 ddlogb1410 logb 100E0 -> 2 ddlogb1411 logb 1000E0 -> 3 ddlogb1412 logb 10000E0 -> 4 ddlogb1413 logb 10E1 -> 2 ddlogb1414 logb 100E1 -> 3 ddlogb1415 logb 1000E1 -> 4 ddlogb1416 logb 10000E1 -> 5 ddlogb1417 logb 10E2 -> 3 ddlogb1418 logb 100E2 -> 4 ddlogb1419 logb 1000E2 -> 5 ddlogb1420 logb 10000E2 -> 6 -- special values ddlogb820 logb Infinity -> Infinity ddlogb821 logb 0 -> -Infinity Division_by_zero ddlogb822 logb NaN -> NaN ddlogb823 logb sNaN -> NaN Invalid_operation -- propagating NaNs ddlogb824 logb sNaN123 -> NaN123 Invalid_operation ddlogb825 logb -sNaN321 -> -NaN321 Invalid_operation ddlogb826 logb NaN456 -> NaN456 ddlogb827 logb -NaN654 -> -NaN654 ddlogb828 logb NaN1 -> NaN1 -- Null test ddlogb900 logb # -> NaN Invalid_operation