JDK-6340864 : Implement vectorization optimizations in hotspot-server
- Type: Enhancement
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 5.0,7
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: linux
- CPU: x86
- Submitted: 2005-10-24
- Updated: 2013-11-12
- Resolved: 2012-08-27
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Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
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To download the current JDK release, click here.
| JDK 7 | JDK 8 | Other |
|---|---|---|
7u40Resolved  |
8Fixed |
hs24Fixed |
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Description
A DESCRIPTION OF THE REQUEST :
Almost all C-compilers available are able to vectorize code, so that simple code in loops for example can be processed in parallel by using the SIMD registers of modern CPUs like SSE1/2 or AltiVec.
Hotspot-server still uses SSE only for batch-procession of fpu-operations and it would be great if hotspot would be also able to optimize this caseses since it sometimes can even double performance.
JUSTIFICATION :
to archive higher performance on algorythmic code.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
code like this should be vectorized:
int x;
int[] a = new int[10000];
for(int i=0; i < a.length; i++)
{
x += a[i];
}
ACTUAL -
the generated code does not make any use of SIMD commands
CUSTOMER SUBMITTED WORKAROUND :
Write C libraries which handle all the complex stuff and write java-code just for the stuff arround itl
Comments
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