JDK-8230835 : [Graal] Missing intrinsics for Math.ceil, floor, rint.
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 14
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • CPU: x86_64
  • Submitted: 2019-09-11
  • Updated: 2019-09-19
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tbdUnresolved
Related Reports
Relates :  
JDK-8226721 - Missing intrinsics for Math.ceil, floor, rint
Description
A DESCRIPTION OF THE PROBLEM :
The Math class lacks intrinsic implementations of the double precision fp rounding methods: ceil, floor, rint.

On x86 SSE/AVX systems; It would be preferable to utilize instructions 'roundsd' rather than the default jdk implementation.
Since there's also a packed variation, '(v)roundpd', the use of intrinsics may enable auto-vectorization where currently such optimization is obstructed by the default implementations of Math.ceil, floor, rint.