JDK-8174062 : Add documentation for JDK-8154122 to Tools Reference Guide
  • Type: Sub-task
  • Component: docs
  • Sub-Component: tools
  • Affected Version: 9
  • Priority: P4
  • Status: Resolved
  • Resolution: Delivered
  • Submitted: 2017-02-07
  • Updated: 2017-03-07
  • Resolved: 2017-03-07
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JDK 9
9Resolved
Related Reports
Relates :  
JDK-8154122 - Intrinsify fused mac operations on x86
Description
Add flag to the Tools Reference Guide: 
-XX:+UseFMA
Comments
Looks good to me, thanks for updating!
07-03-2017
Updated the text and re-posted the review page: http://review.us.oracle.com/review2/Review.html#reviewId=311171;scope=review;status=open;documentId=1622012;noteId=3972346
06-03-2017
Thanks for the quick reply! The text says "FMA intrinsics are generated for new methods by java.lang.Math.fma(a, b, c)" but the intrinsics are not generated *by* java.lang.Math.fma" but *for* these methods. I would rephrase this a bit and say "FMA intrinsics are generated for the java.lang.Math.fma(a, b, c) methods which calculate the value of (a * b + c) expressions".
06-03-2017
The updated content can be reviewed at: http://review.us.oracle.com/review2/Review.html#reviewId=311171;scope=review;documentId=1622012;fragment=GUID-3B1CE181-CD30-4178-9602-230B800D4FAE
03-03-2017
Hi [~cwayne], are there any updates on this? Thanks, Tobias
03-03-2017
This is for "Advanced JIT Compiler Options for java" section.
07-02-2017
-XX:+UseFMA Enables hardware-based FMA intrinsics for hardware where FMA instructions are available (Intel, SPARC, ARM64). FMA intrinsics are generated for new methods in JDK 9 java.lang.Math.fma(a, b, c) which calculate value of (a * b + c) expressions. Note, last expression does not sound good for me. Please, fix it.
07-02-2017