Details
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Enhancement
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Resolution: Fixed
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P4
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11, 17, 21, 22, 23
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b08
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aarch64
Description
Remove Math.log instrinsic (it is already disabled).
Reason: the available implementation gave incorrect results:
public class LogTest {
public static void main(String[] args) {
double x = 4.9E-324;
System.out.println(Math.log(x));
System.out.println(StrictMath.log(x));
}
}
Should be -744.4400719213812, result is -710.989276736877.
Correct on Intel x86.
Second reason: We do not have proof of the monotonicity for the patch of this intrinsic.
Reason: the available implementation gave incorrect results:
public class LogTest {
public static void main(String[] args) {
double x = 4.9E-324;
System.out.println(Math.log(x));
System.out.println(StrictMath.log(x));
}
}
Should be -744.4400719213812, result is -710.989276736877.
Correct on Intel x86.
Second reason: We do not have proof of the monotonicity for the patch of this intrinsic.
Attachments
Issue Links
- relates to
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JDK-8215133 AARCH64: disable Math.log intrinsic publishing
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- Resolved
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- Resolved
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- Resolved
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