[fpc-devel] New FPC target: JVM

Michael Schnell mschnell at lumino.de
Mon Aug 22 11:47:31 CEST 2011

On 08/20/2011 01:30 PM, Felipe Monteiro de Carvalho wrote:
> I ask because Android does not use Java Bytecode, it has it's own,
> completely different bytecode.
Ooops. Dalvik in fact completely off-standard on that behalf !

Wikipedia sais:

Standard Java bytecode <http://en.wikipedia.org/wiki/Java_bytecode> 
executes 8-bit stack instructions. Local variables must be copied to or 
from the operand stack by separate instructions. Dalvik instead uses its 
own 16-bit instruction set that works directly on local variables. The 
local variable is commonly picked by a 4-bit 'virtual register' field. 
This lowers Dalvik's instruction count and raises its interpreter speed.

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