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  1. JDK
  2. JDK-8214751

X86: Support for VNNI Instructions

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 12
    • 12
    • hotspot
    • b24
    • x86

    Backports

      Description

        This is VNNI VPDPWSSD instruction support with autovectorization.

        It can vectorize this operation in the loop:
        out[i] += ((in1[2*i] * in2[2*i]) + (in1[2*i+1] * in2[2*i+1]));

        This patch is useful for AI ML/DL applications such as convolution based Neural Nets.

        More information on VNNI can be found here:
        https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf
        Code contributed by: razvan.a.lupusoru@intel.com and vdeshpande(vivek.r.deshpande@intel.com)

        The initial performance gains with micro on skylake with AVX3 is 10.8x.
         and it generates
        vmovdqu xmm3, xmmword ptr [rbp+r8*2+0x10]
        vmovdqu xmm6, xmmword ptr [rdx+r8*2+0x10]
        vpmaddwd xmm3, xmm6, xmm3
        vpaddd xmm3, xmm3, xmmword ptr [r9+rdi*4+0x10]
        vmovdqu xmmword ptr [r9+rdi*4+0x10], xmm3

        It can generate vpdpwssd instruction on cascadelake.

        The webrev is here:
        http://cr.openjdk.java.net/~vdeshpande/8214751/VNNI/webrev.00/

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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-8216228 X86: Support for VNNI Instructions

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8215353 x86_32 build failures after JDK-8214751 (X86: Support for VNNI Instructions)

            • P1 - Blocks development and/or testing work, production could not run.
            • Resolved

            Enhancement - null JDK-8215891 X86: Support for VNNI byte Instruction VPDPBUSD

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

            Enhancement - null JDK-8239549 AArch64: Backend support for MulAddVS2VI node

            • 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-8219151 Illegal instruction exception on JDK 12 due to incorrect CPU feature bits

            • P1 - Blocks development and/or testing work, production could not run.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8236701 [TESTBUG] compiler/loopopts/superword/Vec_MulAddS2I.java uses wrong flag -XX:-SuperWord

            • 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-8216050 Superword optimization fails with assert(0 <= i && i < _len) failed: illegal index

            • P1 - Blocks development and/or testing work, production could not run.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8229694 JVM crash in SWPointer during C2 OSR compilation

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8230185 assert(is_Loop()) failed: invalid node class

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8230078 compiler/loopopts/superword/Vec_MulAddS2I.java is unexpectedly slow in windows

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

            Enhancement - null JDK-8216580 Fix generation of VNNI vector code by allowing adjacent LoadS nodes to be isomorphic

            • P3 - Major loss of function.
            • Resolved

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                vdeshpande Vivek Deshpande (Inactive)
                vdeshpande Vivek Deshpande (Inactive)
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                  Created:
                  Updated:
                  Resolved: