8287525: Extend IR annotation with new options to test specific target feature. #8999

swati-sha · 2022-06-02T17:17:21Z

Hi All,

Currently test invocations are guarded by @requires vm.cpu.feature tags which are specified as the part of test tag specifications. This results into generating multiple test cases if some test points in a test file needs to be guarded by a specific features while others should still be executed in absence of missing target feature.

This is specially important for IR checks based validation since C2 IR nodes creation may heavily rely on existence of specific target feature. Also, test harness executes test points only if all the constraints specified in tag specifications are met, thus imposing an OR semantics b/w @requires tag based CPU features becomes tricky.

Patch extends existing @ir annotation with following two new options:-

applyIfCPUFeatureAnd:
Accepts a list of feature pairs where each pair is composed of target feature string followed by a true/false value where a true value necessities existence of target feature and vice-versa. IR verifications checks are enforced only if all the specified feature constraints are met.
applyIfCPUFeatureOr: Accepts similar arguments as above option but IR verifications checks are enforced only when at least one of the specified feature constraints are met.

Example usage:
@ir(counts = {IRNode.ADD_VI, "> 0"}, applyIfCPUFeatureOr = {"avx512bw", "true", "avx512f", "true"})
@ir(counts = {IRNode.ADD_VI, "> 0"}, applyIfCPUFeatureAnd = {"avx512bw", "true", "avx512f", "true"})

Please review and share your feedback.

Thanks,
Swati

Progress

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Issue

JDK-8287525: Extend IR annotation with new options to test specific target feature.

Reviewers

Christian Hagedorn (@chhagedorn - Reviewer)
Vladimir Kozlov (@vnkozlov - Reviewer)

Contributors

Jatin Bhateja <jbhateja@openjdk.org>

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk pull/8999/head:pull/8999
$ git checkout pull/8999

Update a local copy of the PR:
$ git checkout pull/8999
$ git pull https://git.openjdk.org/jdk pull/8999/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 8999

View PR using the GUI difftool:
$ git pr show -t 8999

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/8999.diff

…t feature.

swati-sha · 2022-06-02T17:17:58Z

/label add hotspot-compiler-dev

bridgekeeper · 2022-06-02T17:19:09Z

👋 Welcome back swati-sha! 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 · 2022-06-02T17:20:26Z

@swati-sha
The hotspot-compiler label was successfully added.

mlbridge · 2022-06-02T17:23:55Z

Webrevs

swati-sha · 2022-06-02T17:24:24Z

/contributor add @jatin-bhateja

openjdk · 2022-06-02T17:24:47Z

@swati-sha
Contributor Jatin Bhateja <jbhateja@openjdk.org> successfully added.

vnkozlov · 2022-06-02T18:13:53Z

test/hotspot/jtreg/compiler/lib/ir_framework/IR.java

+     * Accepts a list of feature pairs where each pair is composed of target feature string followed by a true/false
+     * value where a true value necessities existence of target feature and vice-versa.


I don't think you need to repeat the same 2 lines.

vnkozlov · 2022-06-02T18:17:00Z

test/hotspot/jtreg/compiler/lib/ir_framework/IR.java

+     * value where a true value necessities existence of target feature and vice-versa.
+     * IR verifications checks are enforced only if all the specified feature constraints are met.
+     */
+    String[] applyIfTargetFeatureAnd() default {};


Why you used Target instead of original CPU (you check output of getCPUFeatures() only)?
Do you plan to extend this to check flags too in a future?

chhagedorn

That's a good feature to have. Thanks for adding support for it! This will definitely simplify the vector IR tests.

chhagedorn · 2022-06-03T08:16:43Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

+            String value = andRules[i];
+            TestFormat.check((value.contains("true") || value.contains("false")), "Incorrect value in " + ruleType + failAt());
+            if (!checkTargetFeature(feature, value)) {
+                // Rule will not be applied but keep processing the other flags to verify that they are same.


Typo:

Suggested change

// Rule will not be applied but keep processing the other flags to verify that they are same.

// Rule will not be applied but keep processing the other target features to verify that they are sane.

chhagedorn · 2022-06-03T08:19:19Z

test/hotspot/jtreg/testlibrary_tests/ir_framework/examples/TargetFeatureCheckExample.java

+    }
+
+    @Test
+    @IR(counts = {"AddVI", "> 0"}, applyIfTargetFeatureAnd = {"avx512bw", "false"})


As this file represents a usage example, please consider using IRNode.AddVI by adding a new IR regex to IRNode. But it looks like that this test is rather a correctness test for AddVI and could be moved to the other vector IR tests. The tests in the ir_framework.examples package are more about providing information about the usage rather than actually testing something meaningful.

But I think it's good to have an example how to use applyIfTargetFeature* as well. But maybe such an example would better fit into the existing IRExample.java file where we have existing IR examples and descriptions for applyIf*.

chhagedorn · 2022-06-03T08:36:06Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

+        if (irAnno.applyIfTargetFeatureAnd().length != 0) {
+            boolean check = hasRequiredFeaturesAnd(irAnno.applyIfTargetFeatureAnd(), "applyIfTargetFeatureAnd");
+            if (!check) {
+                System.out.println("Disabling IR validation for " + m + ", all feature constraints not met.");


Note that this message will be printed inside the test VM together with a lot of other messages (-XX:+PrintCompilation etc.). This output will not be shown by default. So, it will be hard to find this message again and it might not provide an additional value. For printing log messages inside the test VM, you can use the TestFrameworkSocket which pipes messages to the JTreg driver VM to print them there. Since the JTreg driver VM only does a minimal printing, it can easily be found again towards the end of the output under "Messages from Test VM". Specify a tag and then you can use it like that:

TestFrameworkSocket.write("Disabling IR matching for " + m + ": Not all feature constraints met.", "[IREncodingPrinter]", true);

JTreg Output:

STDOUT: Run Flag VM: [...] Messages from Test VM --------------------- [IREncodingPrinter] Disabling IR matching for test2: Could not match all feature constraints. [...]

I guess we could use the same kind of messages for the other applyIf* methods above. If you want to add them as well, feel free to do so. Otherwise, this could also be done separately in an RFE at some point.

chhagedorn · 2022-06-03T09:53:28Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

@@ -137,6 +154,16 @@ private void checkIRAnnotations(IR irAnno) {
            TestFormat.checkNoThrow(irAnno.applyIf().length <= 2,
                                    "Use applyIfAnd or applyIfOr or only 1 condition for applyIf" + failAt());
        }
+        if (irAnno.applyIfTargetFeatureAnd().length != 0) {
+            applyRules++;
+            TestFormat.checkNoThrow((irAnno.applyIfTargetFeatureAnd().length & 1) == 0,


I suggest to use:

Suggested change

TestFormat.checkNoThrow((irAnno.applyIfTargetFeatureAnd().length & 1) == 0,

TestFormat.checkNoThrow((irAnno.applyIfTargetFeatureAnd().length % 2) == 0,

instead which seems cleaner. Same for the other check below.

chhagedorn · 2022-06-03T09:56:26Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

+            if ((value.contains("true") && s.contains(feature)) ||
+               (value.contains("false") && !s.contains(feature))) {
+                return true;
+            }


Could be simplified to:

Suggested change

if ((value.contains("true") && s.contains(feature)) ||

(value.contains("false") && !s.contains(feature))) {

return true;

}

return (value.contains("true") && s.contains(feature)) || (value.contains("false") && !s.contains(feature));

chhagedorn · 2022-06-03T10:05:07Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

+            TestFormat.check((value.contains("true") || value.contains("false")), "Incorrect value in " + ruleType + failAt());
+            if (!checkTargetFeature(feature, value)) {
+                // Rule will not be applied but keep processing the other flags to verify that they are same.
+                return false;


You should cache the return value to keep processing the remaining target feature user strings to check for format errors (similar to what you are doing in hasRequiredFeaturesOr()). We should probably separate the format checking and the actual evaluation of the values at some point. But that would exceed the scope of this RFE.

chhagedorn · 2022-06-03T11:30:01Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

@@ -176,6 +203,62 @@ private boolean hasAllRequiredFlags(String[] andRules, String ruleType) {
        return returnValue;
    }

+    private boolean hasRequiredFeaturesAnd(String[] andRules, String ruleType) {


ruleType is always applyIfTargetFeatureAnd and can be replaced as such.

Suggestion for method name: hasAllRequiredTargetFeatures() to follow the existing naming scheme.

chhagedorn · 2022-06-03T11:33:05Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

+    }
+
+    private boolean checkTargetFeature(String feature, String value) {
+        String s = WHITE_BOX.getCPUFeatures();


I suggest to name it cpuFeatures instead:

Suggested change

String s = WHITE_BOX.getCPUFeatures();

String cpuFeatures = WHITE_BOX.getCPUFeatures();

chhagedorn · 2022-06-03T11:40:06Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

+        return true;
+    }
+
+    private boolean hasRequiredFeaturesOr(String[] orRules, String ruleType) {


ruleType is always applyIfTargetFeatureOr and can be replaced as such.

Suggestion for method name: hasAnyRequiredTargetFeature() (I think the related existing hasNoRequiredFlags() method should be renamed/refactored to follow that convention as well but that's also for another day).

chhagedorn · 2022-06-03T11:51:30Z

test/hotspot/jtreg/compiler/lib/ir_framework/IR.java

+     * value where a true value necessities existence of target feature and vice-versa.
+     * IR verifications checks are enforced if any of the specified feature constraint is met.
+     */
+    String[] applyIfTargetFeatureOr() default {};


I'm not sure if we should follow the existing scheme to also have at least applyIfTargetFeature for a single constraint or not. Back there when I've introduced these constraints I was not happy with writing applyIfAnd/Or for many tests where I actually did not care about AND and OR. I guess you can leave it like that and we can come back to this and maybe clean these things up with JDK-8280120 which wants to introduce another attribute to filter based on the architecture.

…DK-8287525

openjdk · 2022-06-08T12:52:53Z

⚠️ @swati-sha This pull request contains merges that bring in commits not present in the target repository. Since this is not a "merge style" pull request, these changes will be squashed when this pull request in integrated. If this is your intention, then please ignore this message. If you want to preserve the commit structure, you must change the title of this pull request to Merge <project>:<branch> where <project> is the name of another project in the OpenJDK organization (for example Merge jdk:master).

chhagedorn · 2022-06-09T07:24:12Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

-            TestFormat.checkNoThrow((irAnno.applyIfTargetFeatureOr().length & 1) == 0,
-                                    "Argument count for applyIfTargetFeatureOr should be multiple of two" + failAt());
+            TestFormat.checkNoThrow((irAnno.applyIfCPUFeatureOr().length % 2) == 0,
+                                    "Argument count for applyIfCPUFeatureOr should be multiple of two" + failAt());


The format check on L208 cannot be used like that anymore (I can somehow not comment on lines that are hidden):

TestFormat.checkNoThrow(applyRules <= 1, "Can only specify one apply constraint " + failAt());

We should be allowed to specify one applyIf* flag constraint together with one applyIfCPUFeature* constraint while not being allowed to specify multiple applyIf* flag constraints and/or multiple applyIfCPUFeature* constraints.

Do you suggest commenting out check on L208 to enable application of multiple applyIf* constraints OR should that be handled in a separate RFE.

I think we should keep it as specifying multiple constraint attributes of the same kind (flag or CPU feature) should not be allowed. But we need separate the count (applyRules) for the flag based constraints and the CPU feature based constraints. You could rename applyRules -> flagConstraints and change the ones belonging to the new CPU features to cpuFeatureConstraints. Then you can have these checks here, for example:

TestFormat.checkNoThrow(flagConstraints <= 1, "Can only specify one flag constraint" + failAt()); TestFormat.checkNoThrow(cpuFeatureConstraints <= 1, "Can only specify one CPU feature constraint" + failAt());

chhagedorn · 2022-06-09T07:28:38Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

    }

-    private boolean hasRequiredFeaturesOr(String[] orRules, String ruleType) {
+    private boolean hasAnyRequiredCPUFeature(String[] orRules, String ruleType) {


Paremeter is not used anymore:

Suggested change

private boolean hasAnyRequiredCPUFeature(String[] orRules, String ruleType) {

private boolean hasAnyRequiredCPUFeature(String[] orRules) {

chhagedorn · 2022-06-09T07:29:12Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

@@ -203,37 +239,49 @@ private boolean hasAllRequiredFlags(String[] andRules, String ruleType) {
        return returnValue;
    }

-    private boolean hasRequiredFeaturesAnd(String[] andRules, String ruleType) {
+    private boolean hasAllRequiredCPUFeature(String[] andRules, String ruleType) {


Paremeter is not used anymore:

Suggested change

private boolean hasAllRequiredCPUFeature(String[] andRules, String ruleType) {

private boolean hasAllRequiredCPUFeature(String[] andRules) {

chhagedorn · 2022-06-09T07:30:01Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

-                return true;
-            }
+        if (isKNLFlagEnabled == null ||
+             (isKNLFlagEnabled.booleanValue() && (!knlFeatureSet.contains(feature.toUpperCase()) || falseValue))) {


Unboxing is not required:

Suggested change

(isKNLFlagEnabled.booleanValue() && (!knlFeatureSet.contains(feature.toUpperCase()) || falseValue))) {

(isKNLFlagEnabled && (!knlFeatureSet.contains(feature.toUpperCase()) || falseValue))) {

chhagedorn · 2022-06-09T08:35:23Z

test/hotspot/jtreg/testlibrary_tests/ir_framework/examples/TestCPUFeatureCheck.java

 */

-public class TargetFeatureCheckExample {
+public class TestCPUFeatureCheck {


Since this is a full correctness test on emitting AddVI, I suggest to move it to the other existing vector IR tests. The tests in ir_framework.examples and ir_framework.tests are only executed in tier5 and 6 and are more about testing the framework implementation than the actual correctness of C2 transformations.

chhagedorn · 2022-06-09T08:43:23Z

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

+            TestFormat.checkNoThrow((irAnno.applyIfCPUFeature().length % 2) == 0,
+                                    "Argument count for applyIfCPUFeature should be multiple of two" + failAt());


You should also check that applyIfCPUFeature is only applied for one constraint and applyIfCPUFeatureAnd for two or more constraints. This follows the format checks for the flag constraints. This flag constraint design, however, is not very satisfying and has some redundancy. I'm planning to rework this with JDK-8280120.

chhagedorn

That looks good to me. Thanks for doing all the updates!

I'll submit some testing.

openjdk · 2022-06-13T14:38:29Z

@swati-sha 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:

8287525: Extend IR annotation with new options to test specific target feature.

Co-authored-by: Jatin Bhateja <jbhateja@openjdk.org>
Reviewed-by: chagedorn, kvn

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 77 new commits pushed to the master branch:

86c9241: 8287028: AArch64: [vectorapi] Backend implementation of VectorMask.fromLong with SVE2
fbe9266: 8288378: [BACKOUT] DST not applying properly with zone id offset set with TZ env variable
1904353: Merge
7aafc69: 8288105: [PPC64] Problems with -XX:+VerifyStack
f4b05a1: 8288173: JDK-8202449 fix causes conformance test failure : api/java_util/Random/RandomGenerator/NextFloat.html
d9c1364: 8288101: False build warning-as-error with GCC 9 after JDK-8214976
a9c2ab6: 8288080: (fc) FileChannel::map for MemorySegments should state it always throws UOE
e90b579: 8288332: Tier1 validate-source fails after 8279614
b42c1ad: 8279614: The left line of the TitledBorder is not painted on 150 scale factor
9b6d0a7: 8285838: DST not applying properly with zone id offset set with TZ env variable
... and 67 more: https://git.openjdk.org/jdk/compare/a9d46f3413ef64c87520509fd70ac42629fbce91...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.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@chhagedorn, @vnkozlov) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

vnkozlov

Last version looks good.

swati-sha · 2022-06-14T06:09:54Z

/integrate

openjdk · 2022-06-14T06:11:09Z

@swati-sha
Your change (at version f7dcf31) is now ready to be sponsored by a Committer.

jatin-bhateja · 2022-06-14T06:11:33Z

/sponsor

openjdk · 2022-06-14T06:13:36Z

Going to push as commit 03dca56.
Since your change was applied there have been 77 commits pushed to the master branch:

86c9241: 8287028: AArch64: [vectorapi] Backend implementation of VectorMask.fromLong with SVE2
fbe9266: 8288378: [BACKOUT] DST not applying properly with zone id offset set with TZ env variable
1904353: Merge
7aafc69: 8288105: [PPC64] Problems with -XX:+VerifyStack
f4b05a1: 8288173: JDK-8202449 fix causes conformance test failure : api/java_util/Random/RandomGenerator/NextFloat.html
d9c1364: 8288101: False build warning-as-error with GCC 9 after JDK-8214976
a9c2ab6: 8288080: (fc) FileChannel::map for MemorySegments should state it always throws UOE
e90b579: 8288332: Tier1 validate-source fails after 8279614
b42c1ad: 8279614: The left line of the TitledBorder is not painted on 150 scale factor
9b6d0a7: 8285838: DST not applying properly with zone id offset set with TZ env variable
... and 67 more: https://git.openjdk.org/jdk/compare/a9d46f3413ef64c87520509fd70ac42629fbce91...master

Your commit was automatically rebased without conflicts.

openjdk · 2022-06-14T06:13:53Z

@jatin-bhateja @swati-sha Pushed as commit 03dca56.

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

8287525: Extend IR annotation with new options to test specific targe…

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…t feature.

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8283307: Vectorize unsigned shift right on signed subword types #7979

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swati-sha and others added 3 commits June 8, 2022 05:32

8287525: Review comments resolved.

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Merge branch 'openjdk:master' into JDK-8287525

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Merge branch 'JDK-8287525' of https://github.com/swati-sha/jdk into J…

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…DK-8287525

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8289604: compiler/vectorapi/VectorLogicalOpIdentityTest.java failed on x86 AVX1 system #9373

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		* Accepts a list of feature pairs where each pair is composed of target feature string followed by a true/false
		* value where a true value necessities existence of target feature and vice-versa.

	// Rule will not be applied but keep processing the other flags to verify that they are same.
	// Rule will not be applied but keep processing the other target features to verify that they are sane.

	TestFormat.checkNoThrow((irAnno.applyIfTargetFeatureAnd().length & 1) == 0,
	TestFormat.checkNoThrow((irAnno.applyIfTargetFeatureAnd().length % 2) == 0,

	String s = WHITE_BOX.getCPUFeatures();
	String cpuFeatures = WHITE_BOX.getCPUFeatures();

	private boolean hasAnyRequiredCPUFeature(String[] orRules, String ruleType) {
	private boolean hasAnyRequiredCPUFeature(String[] orRules) {

	private boolean hasAllRequiredCPUFeature(String[] andRules, String ruleType) {
	private boolean hasAllRequiredCPUFeature(String[] andRules) {

	(isKNLFlagEnabled.booleanValue() && (!knlFeatureSet.contains(feature.toUpperCase()) \|\| falseValue))) {
	(isKNLFlagEnabled && (!knlFeatureSet.contains(feature.toUpperCase()) \|\| falseValue))) {

		TestFormat.checkNoThrow((irAnno.applyIfCPUFeature().length % 2) == 0,
		"Argument count for applyIfCPUFeature should be multiple of two" + failAt());

8287525: Extend IR annotation with new options to test specific target feature. #8999

8287525: Extend IR annotation with new options to test specific target feature. #8999

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