Philipp Rebsamen created MATH-1685:
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Summary: Math.sin() evaluates to different results on arm64 and x64
Key: MATH-1685
URL: https://issues.apache.org/jira/browse/MATH-1685
Project: Commons Math
Issue Type: Bug
Environment: aarch64
x64
Reporter: Philipp Rebsamen
When using Math.sin(), certain inputs evaluate to different results on arm64
and x64 architectures. We have tested it on several Apple M4, M3 and M2 powered
MacBooks as well as some Windows notebooks (all running Windows 11). Here are
the respective outputs (with comparison to FastMath and StrictMath libraries as
well):
x64:
Math.sin(1.8546554965762145) = 0.9599817810077{*}941{*}
_FastMath.sin(1.8546554965762145) = 0.9599817810077941_
_StrictMath.sin(1.8546554965762145) = 0.9599817810077941_
aarch64:
Math.sin(1.8546554965762145) = 0.9599817810077{*}942{*}
_FastMath.sin(1.8546554965762145) = 0.9599817810077941_
_StrictMath.sin(1.8546554965762145) = 0.9599817810077941_
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