uschindler commented on code in PR #12754:
URL: https://github.com/apache/lucene/pull/12754#discussion_r1381961561
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lucene/core/src/java/org/apache/lucene/util/Constants.java:
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@@ -53,28 +53,33 @@ private Constants() {} // can't construct
/** The value of <code>System.getProperty("java.vendor")</code>. */
public static final String JAVA_VENDOR = System.getProperty("java.vendor");
+ /** True iff the Java runtime is a client runtime and C2 compiler is not
enabled */
+ public static final boolean IS_CLIENT_VM =
+ System.getProperty("java.vm.info", "").contains("emulated-client");
+
/** True iff running on a 64bit JVM */
- public static final boolean JRE_IS_64BIT;
+ public static final boolean JRE_IS_64BIT = is64Bit();
+
+ /** true iff we know fast FMA is supported, to deliver less error */
+ public static final boolean HAS_FAST_FMA =
+ (IS_CLIENT_VM == false)
+ && Constants.OS_ARCH.equals("amd64")
Review Comment:
not sure if this may still be NULL (see below). Maybe be safe here, as
Constants class is early init.
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