llvm dev - Oct 2016 - 128bit binary instruction format?

Hi,

The ISA I am working on is always encoded in 128bit binary format. I find
that getBinaryCodeForInst() only return at most 64bit Encoding.
So, I think the proper way to encode the instructions is to write the
XXXMCCodeEmitter by myself instead of automatic generation. right?

Is there any guideline/suggestion on how to write the XXXMCCodeEmitter
using current LLVM infrastructure? I want to use the existing
classes/functions in backend infrastructure as much as I can.

Thanks!
Ruiling
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On 10/28/2016 6:39 AM, Ruiling Song via llvm-dev wrote:
> Hi,
>
> The ISA I am working on is always encoded in 128bit binary format. I 
> find that getBinaryCodeForInst() only return at most 64bit Encoding.
> So, I think the proper way to encode the instructions is to write the 
> XXXMCCodeEmitter by myself instead of automatic generation. right?
>
> Is there any guideline/suggestion on how to write the XXXMCCodeEmitter 
> using current LLVM infrastructure? I want to use the existing
> classes/functions in backend infrastructure as much as I can.
If you want an example of a backend that doesn't use 
getBinaryCodeForInst(), you can look at the x86 backend.  That said, the 
right approach probably depends on what exactly you mean by 128bit 
binary format...

-Eli

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