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  1. JDK
  2. JDK-6340864

Implement vectorization optimizations in hotspot-server

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    • b21
    • x86
    • linux

    Backports

      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

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-2229147 Implement vectorization optimizations in hotspot-server

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8002801 Implement vectorization optimizations in hotspot-server

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8002802 Implement vectorization optimizations in hotspot-server

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8002803 Implement vectorization optimizations in hotspot-server

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8017962 Implement vectorization optimizations in hotspot-server

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed
            duplicates

            Enhancement - null JDK-7042769 Support SIMD for performance

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-7200233 C2: can't use expand rules for vector instruction rules

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-7192383 vectorize sum of arrays's elements loop

            • P3 - Major loss of function.
            • Closed

            Enhancement - null JDK-6559557 Support for vector instructions in bytecode

            • P5 - Cosmetic problem like misspelt words or misaligned text.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-7196199 java/text/Bidi/Bug6665028.java failed: Bidi run count incorrect

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8024830 SEGV in org.apache.lucene.codecs.compressing.CompressingTermVectorsReader.get

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-7192963 assert(_in[req-1] == this) failed: Must pass arg count to 'new'

            • P3 - Major loss of function.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-7192964 assert(false) failed: bad AD file

            • P3 - Major loss of function.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-7192965 assert(is_aligned_sets(size)) failed: mask is not aligned, adjacent sets

            • P3 - Major loss of function.
            • Closed

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                kvn Vladimir Kozlov
                rmandalasunw Ranjith Mandala (Inactive)
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                  Updated:
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