On Thu, 2 Jun 2022 18:49:13 GMT, ExE Boss <d...@openjdk.java.net> wrote:
>> Claes Redestad has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> We now don't need big Species classes for shorter concats, so on some
>> tests the improvements meant more Species class generation. Adjusting
>> HelloClasslist
>
> make/jdk/src/classes/build/tools/classlist/HelloClasslist.java line 116:
>
>> 114: String CC = "string" + c;
>> 115: String CCS = "string" + c + s;
>> 116: String CSCC = "string" + s + "string" + c;
>
> I’m pretty sure that `f` and `c` will be inlined as compile‑time constants in
> the String concat recipes.
You would think that, but javac doesn't do anything fancy once you store to a
local
javap output for lines 108 through 111:
449: ldc #148 // float 0.1f
451: fstore 31
453: fload 31
455: invokedynamic #149, 0 // InvokeDynamic
#4:makeConcatWithConstants:(F)Ljava/lang/String;
460: astore 32
462: fload 31
464: aload 4
466: invokedynamic #152, 0 // InvokeDynamic
#7:makeConcatWithConstants:(FLjava/lang/String;)Ljava/lang/String;
471: astore 33
473: aload 4
475: fload 31
477: invokedynamic #155, 0 // InvokeDynamic
#10:makeConcatWithConstants:(Ljava/lang/String;F)Ljava/lang/String;
-------------
PR: https://git.openjdk.java.net/jdk/pull/8855
