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  1. JDK
  2. JDK-8026049

(bf) Intrinsify ByteBuffer.put{Int,Double,Float,...} methods

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 9
    • 9
    • core-libs
    • b64

    Backports

      Description

        I think the issue can also be solved with VM intrinsics, but it seems simpler to do it with s.m.Unsafe. Current code for non-byte ByteBuffer calls all the way down to Bits, which does:

            static void putIntB(ByteBuffer bb, int bi, int x) {
                bb._put(bi , int3(x));
                bb._put(bi + 1, int2(x));
                bb._put(bi + 2, int1(x));
                bb._put(bi + 3, int0(x));
            }

        The compiler is known to produce distinct writes in these cases. It is beneficial to replace byte-wide stores into the full-width stores. The caveats include: misaligned reads/writes, handling endianness, etc.

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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-8082639 (bf) Intrinsify ByteBuffer.put{Int,Double,Float,...} methods

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

            Enhancement - null JDK-8016539 Optimization / long/int/short/double/float serialization

            • P3 - Major loss of function.
            • Resolved

            Enhancement - null JDK-4855830 (bf) Little-endian buffers could be faster (x86)

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

            Enhancement - null JDK-5095459 (bf) Improve performance of ByteBuffer.putLong()

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

            Enhancement - null JDK-6914113 Copy int to byte[] in 1 step

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8079860 (bf) ByteBuffer getFloat throw BufferOverflowException while BufferUnderflowException is expected

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8076523 assert(((ABS(iv_adjustment_in_bytes) % elt_size) == 0)) fails in superword.cpp

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8078504 Zero fails to build

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8186090 java.nio.Bits.unaligned() doesn't handle aarch64

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

            Enhancement - null JDK-8073093 AARCH64: C2 generates poor code for ByteBuffer accesses

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8165231 java.nio.Bits.unaligned() doesn't return true on ppc

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8079459 JCK test api/java_nio/ByteBuffer/index.html#GetPutXXX start failing after JDK-8026049

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

            Enhancement - null JDK-8158786 ZIP libraries could benefit from new intrinsic accessors to byte arrays

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

            Enhancement - null JDK-8033148 Lexicographic comparators and mismatchers for arrays

            • P3 - Major loss of function.
            • Closed

            Enhancement - null JDK-8073093 AARCH64: C2 generates poor code for ByteBuffer accesses

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

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                aph Andrew Haley
                shade Aleksey Shipilev
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                  Created:
                  Updated:
                  Resolved: