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Fix a performance issue in Decimal.pow. Thanks Stefan Krah for finding this.

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This commit is contained in:
Mark Dickinson 2010-07-08 19:03:34 +00:00
parent f48ea7c2a9
commit a123631a5c
3 changed files with 25 additions and 6 deletions
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13
Lib/test/decimaltestdata/extra.decTest
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@ -213,7 +213,20 @@ extr1658 shift 1234567 3 -> 7000
extr1659 shift 1234567 4 -> 0
extr1660 shift 1234567 5 -> NaN Invalid_operation
-- Cases where the power function was impossibly slow to determine that the
-- result is inexact. Thanks Stefan Krah for identifying this problem.
precision: 16
maxExponent: 999999999
minExponent: -999999999
extr1700 power 10 1e-999999999 -> 1.000000000000000 Inexact Rounded
extr1701 power 100.0 -557.71e-742888888 -> 1.000000000000000 Inexact Rounded
extr1702 power 10 1e-100 -> 1.000000000000000 Inexact Rounded
-- A couple of interesting exact cases for power. Note that the specification
-- requires these to be reported as Inexact.
extr1710 power 1e375 56e-3 -> 1.000000000000000E+21 Inexact Rounded
extr1711 power 10000 0.75 -> 1000.000000000000 Inexact Rounded
extr1712 power 1e-24 0.875 -> 1.000000000000000E-21 Inexact Rounded
-- Tests for the is_* boolean operations
precision: 9