The changes in the Java 9 platform include granular control of both the c1 and c2 JVM compliers. As you can see in the following illustration, the Java HotSpot JVM has two Just-in-Time (JIT) compilation modes--c1 and c2:
The C1 and C2 compilation modes use different compilation techniques and, if used on the same code base, can produce different sets of machine code.
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