Jazelle DBX (direct bytecode execution)[1] is an extension that allows some ARM processors to execute Java bytecode in hardware as a third execution state alongside the existing ARM and Thumb modes.[2] Jazelle functionality was specified in the ARMv5TEJ architecture[3] and the first processor with Jazelle technology was the ARM926EJ-S.[4] Jazelle is denoted by a "J" appended to the CPU name, except for post-v5 cores where it is required (albeit only in trivial form) for architecture conformance.
Jazelle RCT (Runtime Compilation Target) is a different technology based on ThumbEE mode; it supports ahead-of-time (AOT) and just-in-time (JIT) compilation with Java and other execution environments.
The most prominent use of Jazelle DBX is by manufacturers of mobile phones to increase the execution speed of Java ME games and applications.[citation needed] A Jazelle-aware Java virtual machine (JVM) will attempt to run Java bytecode in hardware, while returning to the software for more complicated, or lesser-used bytecode operations. ARM claims that approximately 95% of bytecode in typical program usage ends up being directly processed in the hardware.
The published specifications are very incomplete, being only sufficient for writing operating system code that can support a JVM that uses Jazelle.[citation needed] The declared intent is that only the JVM software needs to (or is allowed to) depend on the hardware interface details. This tight binding facilitates the hardware and JVM evolving together without affecting other software. In effect, this gives ARM Holdings considerable control over which JVMs are able to exploit Jazelle.[citation needed] It also prevents open source JVMs from using Jazelle. These issues do not apply to the ARMv7 ThumbEE environment, the nominal successor to Jazelle DBX.
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modes. Jazelle functionality was specified in the ARMv5TEJ architecture and the first processor with Jazelle technology was the ARM926EJ-S. Jazelle is denoted...
adds both 32- and 16-bit instructions for improved code density, while Jazelle added instructions for directly handling Java bytecode. More recent changes...
explicitly deprecated, but useless without the jsr and jsr_w opcodes. Jazelle DBX (Direct Bytecode eXecution), a feature that executes some Java bytecodes...
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ARM7TDMI-S variant is the synthesizable core. The ARM7EJ-S (ARM7 + Enhanced + Jazelle - Synthesizable) is a version of the ARM7 implementing the ARMv5TE instruction...
Microsoft Outlook Express data files direct byte execution, a tagline used for Jazelle, one of the execution states found in ARM processors DBX, annual Dropbox...
32-bit, 16-bit, and sometimes 8-bit instruction sets. ARM926EJ-S with ARM Jazelle technology, which enables the direct execution of 8-bit Java bytecode in...
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an ARM processor able to run Java bytecode, this technology being named Jazelle. Java Card Binder, Walter; Schoeberl, Martin; Moret, Philippe; Villazon...
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improvement. Hardware execution of Java bytecode, such as that offered by ARM's Jazelle, was explored but not deployed. The performance of a Java bytecode compiled...
David Saint Fleur Art Beatz Curtis Gray Jean-Michel Sissoko Dj Paulito Jazelle Rodriguez Christopher Tempest Kinda Ingrosso Nicki Minaj Jason Derulo Francesco...