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This seems to be missing. See the discussion here:
Please also consider backporting it to 9u.
Author: Jason Tatton (AWS) <email@example.com>
Committer: Paul Hohensee <firstname.lastname@example.org>
Date: 2020-10-14 12:58:21 +0000
I'm sponsoring this issue for Jason Tatton, email@example.com.
The intrinsic for StringUTF16.indexOf(char) was added with Compact Strings (JDK-8054307) because the Java implementation performed worse with the new byte array implementation of Strings. Performance for StringLatin1.indexOf(char) should not be affected, so this is not a regression.
However, I agree that we should add an intrinsic for StringLatin1 as well to avoid the reported performance difference between indexOf(String) and indexOf(char). Targeting this to JDK 10.