JDK-7169934 : pow(x,y) or x64 computes incorrect result when x<0 and y is an odd integer
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: hs24
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: x86
  • Submitted: 2012-05-18
  • Updated: 2013-07-31
  • Resolved: 2012-05-26
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JDK 7 JDK 8 Other
7u40Fixed 8Fixed hs24Fixed
Related Reports
Relates :  
On x64, 7133857 broke pow(x,y) when x<0 and y is an odd integer. This affects debug builds only. int(y) is moved to an register to be tested for parity but between the load of int(y) and the test for parity some debugging code changes the content of the integer register.
This should affect only the interpreter and c1.

The issue is not present in 7u40b31-fastdebug, but it can't be reproduced as it was backported in the first hs24-based build of JDK 7 and was fixed in JDK 8 in the same build where it was introduced. Closed as not verified (setup not available).

EVALUATION http://hg.openjdk.java.net/lambda/lambda/hotspot/rev/e2961d14584b

EVALUATION http://hg.openjdk.java.net/hsx/hotspot-comp/hotspot/rev/e2961d14584b

EVALUATION See description.