JDK 9 RFR of 4477961: java.lang.Math.toDegrees(double) could be optimized
mike.duigou at oracle.com
Mon Sep 22 23:24:30 UTC 2014
Looks fine to me!
On Sep 22 2014, at 15:34 , Brian Burkhalter <brian.burkhalter at oracle.com> wrote:
> Hi Aleksey,
> On Sep 22, 2014, at 2:43 PM, Aleksey Shipilev <aleksey.shipilev at oracle.com> wrote:
>> Hm, and this compiler transformation works in strictfp context? I hope
>> compilers do the constant folding in strictfp/fdlibm mode…
>> I would probably just go and declare the private compile-time constants.
>> This is safer, since: a) you are not at the mercy of optimizing compiler
>> anymore (have you tried the benchmark with C1?); b) the initializing
>> expressions are FP-strict, less opportunity for hard to diagnose numeric
> I created an alternate webrev using compile-time constants per your suggestion:
> The performance improvement is similar to that cited for webrev.00.
> If this version is preferable it will need approval from a JDK 9 Reviewer, of course.
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