[issue3366] Add gamma function, error functions and other C99 math.h functions to math module

[Tim Peters]

Tim Peters <tim.peters at gmail.com> added the comment:

FYI, mysterious numeric differences on PPC are often due to the C
compiler generated code to use the "fused multiply-add" HW instruction.
 In which case, find a way to turn that off :-)

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nosy: +tim_one

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<http://bugs.python.org/issue3366>
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