8263677: Improve Character.isLowerCase/isUpperCase lookups #3028

cl4es · 2021-03-16T12:51:02Z

This patch changes the otherLowercase / otherUppercase bits to be set if either the codepoint is of type LOWERCASE_LETTER and UPPERCASE_LETTER, or the Unicode Other_Lowercase / Other_Uppercase property is set. This simplifies the lookup in Character.isLowerCase/isUpperCase to a single table lookup, which appears to be healthy for performance.

I also took the opportunity to clean up the somewhat dated GenerateCharacter utility class.

Testing: tier1-3

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Issue

JDK-8263677: Improve Character.isLowerCase/isUpperCase lookups

Reviewers

Erik Joelsson (@erikj79 - Reviewer) ⚠️ Review applies to 5dc70a9
Magnus Ihse Bursie (@magicus - Reviewer)
Naoto Sato (@naotoj - Reviewer)
Roger Riggs (@RogerRiggs - Reviewer)

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To checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/3028/head:pull/3028
$ git checkout pull/3028

To update a local copy of the PR:
$ git checkout pull/3028
$ git pull https://git.openjdk.java.net/jdk pull/3028/head

bridgekeeper · 2021-03-16T12:51:23Z

👋 Welcome back redestad! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

openjdk · 2021-03-16T12:52:40Z

@cl4es The following labels will be automatically applied to this pull request:

build
i18n

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing lists. If you would like to change these labels, use the /label pull request command.

cl4es · 2021-03-16T13:55:22Z

Baseline:

Benchmark               (codePoint)  Mode  Cnt   Score   Error  Units
Characters.isLowerCase            9  avgt    5  13.809 ± 0.032  ns/op
Characters.isLowerCase           65  avgt    5  13.811 ± 0.052  ns/op
Characters.isLowerCase           97  avgt    5  12.552 ± 0.057  ns/op
Characters.isLowerCase          128  avgt    5  13.823 ± 0.076  ns/op
Characters.isLowerCase          170  avgt    5  13.811 ± 0.066  ns/op
Characters.isLowerCase          223  avgt    5  12.556 ± 0.058  ns/op
Characters.isLowerCase          410  avgt    5  19.466 ± 0.104  ns/op
Characters.isLowerCase          430  avgt    5  20.718 ± 0.100  ns/op
Characters.isUpperCase            9  avgt    5  12.556 ± 0.056  ns/op
Characters.isUpperCase           65  avgt    5  12.559 ± 0.067  ns/op
Characters.isUpperCase           97  avgt    5  12.555 ± 0.055  ns/op
Characters.isUpperCase          128  avgt    5  12.559 ± 0.060  ns/op
Characters.isUpperCase          170  avgt    5  12.556 ± 0.036  ns/op
Characters.isUpperCase          223  avgt    5  12.554 ± 0.055  ns/op
Characters.isUpperCase          410  avgt    5  20.722 ± 0.129  ns/op
Characters.isUpperCase          430  avgt    5  19.459 ± 0.091  ns/op

Patch:

Benchmark               (codePoint)  Mode  Cnt   Score   Error  Units
Characters.isLowerCase            9  avgt    5  12.556 ± 0.035  ns/op
Characters.isLowerCase           65  avgt    5  12.562 ± 0.073  ns/op
Characters.isLowerCase           97  avgt    5  12.551 ± 0.062  ns/op
Characters.isLowerCase          128  avgt    5  12.553 ± 0.039  ns/op
Characters.isLowerCase          170  avgt    5  12.554 ± 0.051  ns/op
Characters.isLowerCase          223  avgt    5  12.552 ± 0.035  ns/op
Characters.isLowerCase          410  avgt    5  18.833 ± 0.068  ns/op
Characters.isLowerCase          430  avgt    5  18.832 ± 0.074  ns/op
Characters.isUpperCase            9  avgt    5  12.555 ± 0.050  ns/op
Characters.isUpperCase           65  avgt    5  12.557 ± 0.041  ns/op
Characters.isUpperCase           97  avgt    5  12.554 ± 0.056  ns/op
Characters.isUpperCase          128  avgt    5  12.554 ± 0.055  ns/op
Characters.isUpperCase          170  avgt    5  12.555 ± 0.054  ns/op
Characters.isUpperCase          223  avgt    5  12.553 ± 0.036  ns/op
Characters.isUpperCase          410  avgt    5  18.831 ± 0.099  ns/op
Characters.isUpperCase          430  avgt    5  18.826 ± 0.047  ns/op

mlbridge · 2021-03-16T19:48:18Z

Webrevs

01: Full - Incremental (5698b88)
00: Full (5dc70a9)

erikj79

Looks good from build point of view. I like the code cleanups.

openjdk · 2021-03-16T19:59:54Z

@cl4es This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8263677: Improve Character.isLowerCase/isUpperCase lookups

Reviewed-by: erikj, ihse, naoto, rriggs

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 22 new commits pushed to the master branch:

000012a: 8148937: (str) Adapt StringJoiner for Compact Strings
a707fcb: 8263723: [BACKOUT] MoveAndUpdateClosure::do_addr calls function with side-effects in an assert
86e9cd9: 8263667: Avoid running GitHub actions on branches named pr/*
41276eb: 8259863: doc: JShell snippet doesn't compile
f9f2eef: 8263434: Dangling references after MethodComparator::methods_EMCP
23fc2a4: 8263688: Coordinate equals, hashCode and compareTo of JavacFileManager.PathAndContainer
d1baed6: 8263672: fatal error: no reachable node should have no use
086a66a: 8261095: Add test for clhsdb "symbol" command
ec95a5c: 8263410: ListModel javadoc refers to non-existent interface
7b9d256: 8261262: Kitchensink24HStress.java crashed with EXCEPTION_ACCESS_VIOLATION
... and 12 more: https://git.openjdk.java.net/jdk/compare/e33bfb3977153e9c74261d1836b2cb153c47c192...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

RogerRiggs · 2021-03-16T20:10:51Z

make/jdk/src/classes/build/tools/generatecharacter/GenerateCharacter.java

@@ -314,7 +307,7 @@ static void FAIL(String s) {
    static long[] buildMap(UnicodeSpec[] data, SpecialCaseMap[] specialMaps, PropList propList)
    {
        long[] result;
-        if (bLatin1 == true) {
+        if (bLatin1) {


perhaps shorten to:
final long[] result = new long[bLatin1 ? 256 : 1 << 16];

RogerRiggs · 2021-03-16T20:13:07Z

make/jdk/src/classes/build/tools/generatecharacter/GenerateCharacter.java

-            for (int k = 0; k < m; k++) {
-                buffer[ptr+k] = map[i+k];
-            }
+            if (m >= 0) System.arraycopy(map, i, buffer, ptr, m);


If m == 0, you could skip the arraycopy.

RogerRiggs · 2021-03-16T20:13:38Z

make/jdk/src/classes/build/tools/generatecharacter/GenerateCharacter.java

-        for (int j = 0; j < ptr; j++) {
-            newdata[j] = buffer[j];
-        }
+        if (ptr >= 0) System.arraycopy(buffer, 0, newdata, 0, ptr);


ditto, if ptr == 0, skip the arraycopy

RogerRiggs · 2021-03-16T20:20:00Z

make/jdk/src/classes/build/tools/generatecharacter/GenerateCharacter.java

-        for (int j=0; j<args.length; ++j) {
-            desc.append(" " + args[j]);
+        for (String arg : args) {
+            desc.append(" " + arg);


Avoid string concat:
desc.append(' ').append(arg);

cl4es · 2021-03-17T15:21:30Z

/integrate

openjdk · 2021-03-17T15:22:40Z

@cl4es Since your change was applied there have been 23 commits pushed to the master branch:

b63b5d4: 8263732: ProblemList serviceability/sa/ClhsdbSymbol.java on ZGC
000012a: 8148937: (str) Adapt StringJoiner for Compact Strings
a707fcb: 8263723: [BACKOUT] MoveAndUpdateClosure::do_addr calls function with side-effects in an assert
86e9cd9: 8263667: Avoid running GitHub actions on branches named pr/*
41276eb: 8259863: doc: JShell snippet doesn't compile
f9f2eef: 8263434: Dangling references after MethodComparator::methods_EMCP
23fc2a4: 8263688: Coordinate equals, hashCode and compareTo of JavacFileManager.PathAndContainer
d1baed6: 8263672: fatal error: no reachable node should have no use
086a66a: 8261095: Add test for clhsdb "symbol" command
ec95a5c: 8263410: ListModel javadoc refers to non-existent interface
... and 13 more: https://git.openjdk.java.net/jdk/compare/e33bfb3977153e9c74261d1836b2cb153c47c192...master

Your commit was automatically rebased without conflicts.

Pushed as commit e152cc0.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

Improve Character.isLowerCase/isUpperCase lookups

abec6b1

openjdk bot added build build-dev@openjdk.org i18n i18n-dev@openjdk.org labels Mar 16, 2021

cl4es added 4 commits March 16, 2021 14:56

Widen the range of codepoints tested by Characters micro

8016770

Fix lookup in 00, 01, 0E planes

bbfabef

Cleanups and modernizations

68424de

Merge branch 'master' into character_case

5dc70a9

cl4es marked this pull request as ready for review March 16, 2021 19:44

openjdk bot added the rfr Pull request is ready for review label Mar 16, 2021

erikj79 approved these changes Mar 16, 2021

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openjdk bot added the ready Pull request is ready to be integrated label Mar 16, 2021

RogerRiggs reviewed Mar 16, 2021

View reviewed changes

Roger review + additional cleanups

5698b88

magicus approved these changes Mar 16, 2021

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naotoj approved these changes Mar 16, 2021

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RogerRiggs approved these changes Mar 17, 2021

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openjdk bot closed this Mar 17, 2021

openjdk bot added integrated Pull request has been integrated and removed ready Pull request is ready to be integrated rfr Pull request is ready for review labels Mar 17, 2021

cl4es deleted the character_case branch March 17, 2021 15:22

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8263677: Improve Character.isLowerCase/isUpperCase lookups #3028

8263677: Improve Character.isLowerCase/isUpperCase lookups #3028

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8263677: Improve Character.isLowerCase/isUpperCase lookups #3028

8263677: Improve Character.isLowerCase/isUpperCase lookups #3028

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