APAR status
Closed as program error.
Error description
Error Message: N/A . Stack Trace: N/A . Performing 64-bit division of non-constant values by the constants 12884901888 (0x300000000), 21474836480 (0x500000000), 30064771072 (0x700000000), 38654705664 (0x900000000), 42949672960 (0xa00000000), or 51539607552 (0xc00000000) on big-endian Power machines may return incorrect results in JITted methods. This affects both Linux and AIX on big-endian Power running Java 8. This issue does not affect Java 7 or prior, nor does it affect little-endian Power or any other architectures.
Local fix
N/A
Problem summary
During optimization on certain architectures, division of non-constant values by known constants is optimized into a multiplication by a magic value to avoid long-latency division instructions. The function for doing this was returning incorrect magic values for certain large denominators due to an endianness bug that would result in an internal table being read with the two words of a 64-bit integer reversed.
Problem conclusion
The optimizer has been fixed to return the correct magic values for all denominators regardless of the endianness of the machine. . This APAR will be fixed in the following Java Releases: 8 SR5 FP35 (8.0.5.35) . Contact your IBM Product's Service Team for these Service Refreshes and Fix Packs. For those running stand-alone, information about the available Service Refreshes and Fix Packs can be found at: https://www.ibm.com/developerworks/java/jdk/
Temporary fix
Comments
APAR Information
APAR number
IJ15187
Reported component name
JIT
Reported component ID
620700124
Reported release
130
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-04-01
Closed date
2019-04-01
Last modified date
2019-04-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
JIT
Fixed component ID
620700124
Applicable component levels
[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"130","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
01 April 2019