JDK-6827605 : new String intrinsics may prevent EA scalar replacement
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: hs16
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • OS: solaris_10
  • CPU: sparc
  • Submitted: 2009-04-08
  • Updated: 2010-04-03
  • Resolved: 2009-09-09
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JDK 6 JDK 7 Other
6u14pFixed 7Fixed hs15Fixed
Related Reports
Relates :  
JDK-6890984 - Comparison of 2 arrays could cause VM crash.
Relates :  
JDK-6761600 - use sse 4.2 in intrinsics
Relates :  
JDK-2191149 - String.indexOf() returns incorrect result on x86 with SSE4.2
Description
Non-escaping new String object is not scalar replaceable if it referenced by new ideal nodes StrIndexOf, StrEquals
which were introduced with changes for 6761600.
Comments
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/62001a362ce9
15-09-2009
EVALUATION http://hg.openjdk.java.net/hsx/hsx16/master/rev/e502d7524e3a
04-09-2009
PUBLIC COMMENTS Problem: New String.indexOf SSE4.2 intrinsic prevents EA scalar replacement of String object clone in the famous hot jbb code in Orderline.process: stockData.indexOf("ORIGINAL") Solution: I did not have time to implement full fix in HS16. So it is forward port of the fix in HS15.
26-08-2009
EVALUATION http://hg.openjdk.java.net/hsx/hsx16/baseline/rev/e502d7524e3a
26-08-2009