[fpc-devel] FPC-JVM: Status report on Android

Jonas Maebe jonas.maebe at elis.ugent.be
Mon Aug 29 10:58:51 CEST 2011

On 29 Aug 2011, at 09:58, Michael Schnell wrote:

> How did you manage to move from the 8 bit SUN Java bytecode to the  
> 16 bit Android /Dalvik code ?

You are thinking of 8 and 16 bit in the wrong way. Those are simply  
details of the respective byte code instruction formats. For example,  
it's about whether an "add" instruction is encoded using 1 byte or  
using 2 bytes. It has nothing to do with the width of the executed  
operations (the JVM byte code instruction set includes 64 bit integer  
and floating point operations). Also note that this is only about the  
instruction opcodes: if you include the operands then several JVM byte  
code instructions are wider than 8 bit.


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