RFR: 8285868: x86_64 intrinsics for floating point methods isNaN, isFinite and isInfinite [v4]

[Srinivas Vamsi Parasa]

> We develop optimized x86_64 intrinsics for the floating point class check methods isNaN(), isFinite() and IsInfinite() for Float and Double classes. JMH benchmarks show ~8x improvement for isNan(), ~3x improvement for isInfinite() and 15% gain for isFinite().
> 
> 
> JMH Benchmark (ns/op)	              Baseline	  This PR (WITH vfpclassss/sd)                      Speedup
> 		                               
> FloatClassCheck.testIsFinite	      0.559	                  0.4	                            1.4x
> FloatClassCheck.testIsInfinite	      0.828	                  0.386	                            2.15x
> FloatClassCheck.testIsNaN	      2.589	                  0.387	                            6.7x
> DoubleClassCheck.testIsFinite         0.568	                  0.414	                            1.37x
> DoubleClassCheck.testIsInfinite       0.836	                  0.395	                            2.11x
> DoubleClassCheck.testIsNaN	      2.592	                  0.393	                            6.6x
> 
> JMH Benchmark (ns/op)	              Baseline	  This PR (WITHOUT vfpclassss/sd)                   Speedup
> FloatClassCheck.testIsFinite	      0.561	                 0.468	                             1.2x
> FloatClassCheck.testIsInfinite	      0.793	                 0.491	                             1.61x
> FloatClassCheck.testIsNaN	      2.587	                 0.469	                             5.5x
> DoubleClassCheck.testIsFinite         0.561	                 0.592	                             0.94x
> DoubleClassCheck.testIsInfinite       0.828	                 0.592	                             1.4x
> DoubleClassCheck.testIsNaN	      2.593	                 0.594	                             4.4x

Srinivas Vamsi Parasa has updated the pull request incrementally with one additional commit since the last revision:

  Split the macros using predicate

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8459/files
  - new: https://git.openjdk.java.net/jdk/pull/8459/files/f4769cd3..802f2c15

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8459&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8459&range=02-03

  Stats: 39 lines in 1 file changed: 24 ins; 2 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8459.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8459/head:pull/8459

PR: https://git.openjdk.java.net/jdk/pull/8459