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
The Version table provides details related to the release that this issue/RFE will be addressed.
Unresolved : Release in which this issue/RFE will be addressed. Resolved: Release in which this issue/RFE has been resolved. Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
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.