[llvm-dev] Immediates in intrinsics

[Krzysztof Parzyszek via llvm-dev]

To add to this: it is the "imm:$trap" in the selection pattern that does 
it (the "imm:" part of it, to be even more specific).

-Krzysztof


On 12/17/2017 11:01 PM, Craig Topper via llvm-dev wrote:
> The fact that the intrinsic takes an immediate is usually encoded as 
> part of the isel pattern selection
> 
> For example from an x86 intrinsic/instruction:
> 
> def INT : Ii8<0xcd, RawFrm, (outs), (ins u8imm:$trap), "int\t$trap",
>                [(int_x86_int imm:$trap)], IIC_INT>;
> 
> I'm slightly confused by your question though as you mention register 
> which sort of implies you're looking at PowerPC assembly. But you also 
> mention a function, but the intrinsic should have been turned into 
> instructions before assembly and there should be no function call.
> 
> ~Craig
> 
> On Sun, Dec 17, 2017 at 8:26 PM, Justin Hibbits via llvm-dev 
> <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> 
>     I'm trying to add intrinsics for the Signal Processing Engine
>     (FPU/vector unit) on some PowerPC cores, but running into a problem.
>     Some of the instructions take an immediate operand, but I can't figure
>     out how to make the intrinsic use an immediate, it just wants to load
>     a register as an argument to the function.  Is there any way in the
>     .td file to describe the intrinsic as taking an immediate, or do I
>     need to generate an intermediate instruction identifier?
> 
>     Thanks,
>     Justin
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> 
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