JDK-6402977 : Optimize use of SPARC signed and unsigned loads
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 5.0u4
  • Priority: P3
  • Status: Closed
  • Resolution: Duplicate
  • OS: solaris_10
  • CPU: sparc
  • Submitted: 2006-03-23
  • Updated: 2010-07-29
  • Resolved: 2009-02-16
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hs15Resolved
Related Reports
Duplicate :  
JDK-6797305 - Add LoadUB and LoadUI opcode class
Relates :  
JDK-5038535 - Efficiency of SPARC code generated for byte to long conversion
Description
SPARC provides both loads that sign-extend and
loads that zero-extend.  These can be used to
avoid subsequent instructions that are present
for the purpose of sign extension or masking.
Comments
PUBLIC COMMENTS This CR is a duplicate of 6797305 and 5057225. I am currently working on the former and will fix the later afterwards. I'm marking it as a duplicate of 6797305.
16-02-2009
EVALUATION C2 can likely eliminate the shifts with a few new .ad rules.
04-04-2006