8332980: [IR Framework] Add option to measure IR rule processing time

Reviewed-by: kvn, chagedorn

Author: Theo Weidmann

test/hotspot/jtreg/compiler/lib/ir_framework/README.md

@@ -178,6 +178,7 @@ The framework provides various stress and debug flags. They should mainly be use
 - `-DVerbose=true`: Enable more fain-grained logging (slows the execution down).
 - `-DReproduce=true`: Flag to use when directly running a test VM to bypass dependencies to the driver VM state (for example, when reproducing an issue).
 - `-DPrintTimes=true`: Print the execution time measurements of each executed test.
+- `-DPrintRuleMatchingTime=true`: Print the time of matching IR rules per method. Slows down the execution as the rules are warmed up before meassurement.
 - `-DVerifyVM=true`: The framework runs the test VM with additional verification flags (slows the execution down).
 - `-DExcluceRandom=true`: The framework randomly excludes some methods from compilation. IR verification is disabled completely with this flag.
 - `-DFlipC1C2=true`: The framework compiles all `@Test` annotated method with C1 if a C2 compilation would have been applied and vice versa. IR verification is disabled completely with this flag.

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

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -148,6 +148,7 @@ public class TestFramework {
     );
 
     public static final boolean VERBOSE = Boolean.getBoolean("Verbose");
+    public static final boolean PRINT_RULE_MATCHING_TIME = Boolean.getBoolean("PrintRuleMatchingTime");
     public static final boolean TESTLIST = !System.getProperty("Test", "").isEmpty();
     public static final boolean EXCLUDELIST = !System.getProperty("Exclude", "").isEmpty();
     private static final boolean REPORT_STDOUT = Boolean.getBoolean("ReportStdout");

test/hotspot/jtreg/compiler/lib/ir_framework/driver/irmatching/irmethod/IRMethod.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021, 2025, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -39,6 +39,8 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import static compiler.lib.ir_framework.TestFramework.PRINT_RULE_MATCHING_TIME;
+
 /**
  * This class represents a {@link Test @Test} annotated method that has an associated non-empty list of applicable
  * {@link IR @IR} rules.
@@ -83,6 +85,20 @@ public String name() {
      */
     @Override
     public MatchResult match() {
-        return new IRMethodMatchResult(method, matcher.match());
+        if (!PRINT_RULE_MATCHING_TIME) {
+            return new IRMethodMatchResult(method, matcher.match());
+        }
+
+        List<MatchResult> match;
+        for (int i = 0; i < 10; i++) {  // warm up
+            match = matcher.match();
+        }
+
+        long startTime = System.nanoTime();
+        match = matcher.match();
+        long endTime = System.nanoTime();
+        long duration = (endTime - startTime);
+        System.out.println("Verifying IR rules for " + name() + ": " + duration + " ns = " + (duration / 1000000) + " ms");
+        return new IRMethodMatchResult(method, match);
     }
 }