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Do we need instructions with two outputs?
Author:  Date: 2016-04-08 05:46
Hi, related to the JIT discussion I think the proposed ISA needs specific instruction for memory copying, initialization and comparison. Especially, memory copying from small number of bytes to big is important in GC related scenarios. Often memory copy ends up being implemented as multiple complicated vector instructions, when an ISA instruction would be so much better (the CPU could then handle this in the most optimized way for it). Some research has been done on this where adding "cpblk", "initblk" instructions where evaluated and these showed great benefit for code size and speed. I would allow these instructions to have element size defined i.e. 1, 2, 4, 8, 16 bytes for example so one can initialize a "double" array quickly, perhaps even a zero out "zeroblk" instruction since this is used a lot in managed memory scenarios.
 
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