JDK-8255368 : Math.exp() gives wrong result for large values on x86 32-bit platforms
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 11,15,16
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • CPU: x86
  • Submitted: 2020-10-23
  • Updated: 2024-12-20
  • Resolved: 2020-11-18
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JDK 11 JDK 16
11.0.11Fixed 16 b25Fixed
Related Reports
Duplicate :  
JDK-8262030 - win_x86-32 Math.exp not producing Infinity when expected
Relates :  
JDK-8132207 - update for x86 exp in the math lib
Description
exp(10000) give result as 0 instead of positive infinity on x86 32-bit platforms.
This is a bug in the 32-bit intrinsic.
Comments
[~aleonard] I've sponsored the OpenJDK 11u push for you.
24-02-2021
Fix Request Sponsored fix request comment on behalf of Andreas Ahlenstorf <andreas@ahlenstorf.ch>. Backporting this patch fixes a problem with Math.exp() giving wrong results for very large numbers on x86 (32 bit). The patch was directly exported from openjdk/jdk and applies cleanly to 11u. Running tier1 tests on Windows did not yield additional test failures and the test included in the patch passes, too. The patch corrects the x86 intrinsic of Math.exp() and should therefore have a small impact.
23-02-2021
Changeset: c0892148 Author: Xubo Zhang <xubo.zhang@intel.com> Committer: Sandhya Viswanathan <sviswanathan@openjdk.org> Date: 2020-11-18 04:49:15 +0000 URL: https://github.com/openjdk/jdk/commit/c0892148
18-11-2020
Great, thanks! Assigning this to you for now.
29-10-2020
[~thartmann] Yes, Xubo Zhang from Intel has a fix and will submit a pull request on this.
28-10-2020
[~sviswanathan] do you intent to work on this or should we assign to someone else? Did you investigate the root cause yet? Thanks.
28-10-2020
ILW = Incorrect execution of compiled code, Math.exp on 32-bit with large value, disable Math.exp intrinsic = HLM = P3
26-10-2020