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  1. JDK
  2. JDK-8262355

Support for AVX-512 opmask register allocation.

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Details

    • Enhancement
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • 17
    • 17
    • hotspot
    • None
    • b17
    • x86

    Description

      - AVX-512 added 8 new 64 bit opmask register (k0-k7). These registers enable predicated vector instruction such that an operation is performed only over vector lanes for which corresponding bit is set in opmask register.

      - Currently in order to support predicated vector operations in macro assembly routines computed masks are stored in hard coded opmask registers.

      - Cross instruction mask propagation is done either using a GPR or a vector a vector register.

      - Register allocation support for opmask register (k1-k7) will facilitate mask propagation across instruction and thus enable emitting efficient instruction sequence over X86 targets supporting AVX-512 feature.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8264759 x86_32 Minimal VM build failure after JDK-8262355

          • 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-8277777 [Vector API] assert(r->is_XMMRegister()) failed: must be in x86_32.ad

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8267375 Aarch64: JVM crashes with option -XX:PrintIdealGraphLevel=3 on SVE backend

          • P3 - Major loss of function.
          • Open

          Bug - A problem which impairs or prevents the functions of the product. JDK-8281544 assert(VM_Version::supports_avx512bw()) failed for Tests jdk/incubator/vector/

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8269828 corrections in some instruction patterns for KNL x86 platform

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

          Enhancement - null JDK-8262356 Optimize existing masked operation support for AVX-512.

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

          Commit Commit openjdk/jdk/f084bd2f

          Review Review openjdk/jdk/2768

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              jbhateja Jatin Bhateja
              jbhateja Jatin Bhateja
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              Dates

                Created:
                Updated:
                Resolved: