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  1. JDK
  2. JDK-8230525

Missing intrinsics for Integer and Long operations

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      In Long and Integer, the implementations of the following methods are generic, but could be improved for scalar and/or vector code, in a platform-dependent manner:

      reverse (bitwise reversal - RBIT on ARM64, table lookup on x86)
      rotateLeft, rotateRight (instruction if available)

      JDK-8283894 covers the following, which as of 2022 have been added and which should also be made intrinsics:

      compress / expand (x86 PEXT/PDEP)

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          relates to

          Enhancement - null JDK-8248830 C2: Optimize Rotate API on x86

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8283894 Intrinsify compress and expand bits on x86

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

          Enhancement - null JDK-8226721 Missing intrinsics for Math.ceil, floor, rint

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

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              cslucas Cesar Soares
              jrose John Rose
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                Created:
                Updated: