llvm dev - Sep 2008 - [LLVMdev] Tablegen strings

I have a tablegen string that I want to add a modifier to the registers
that are being matched.

 

For example a simple match on fneg:

def FNEG       : OneInOneOut<IL_OP_MOV, (outs GPR:$dst), (ins
GPR:$src0),

    "mov $dst, $src0",    [(set GPR:$dst, (fneg GPR:$src0))]>;

 

I want to place a modifier directly after $src0 in the string so that no
space is between the string

and the matched register. I.e. I want to generate "mov $dst,
$src0_neg",
however, by putting the

_neg right after $src0 forces it to attempt to match against src0_neg
instead of just src0. Where 

can I find the rules for the string pattern matcher so that I can added
arbitrary strings into my

definition.

 

Thanks,

 

 

Micah Villmow

Systems Engineer

Advanced Technology & Performance

Advanced Micro Devices Inc.

4555 Great America Pkwy,

Santa Clara, CA. 95054

P: 408-572-6219

F: 408-572-6596

 

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On Sep 23, 2008, at 11:00 AM, Villmow, Micah wrote:
> I have a tablegen string that I want to add a modifier to the  
> registers that are being matched.
>
> For example a simple match on fneg:
> def FNEG       : OneInOneOut<IL_OP_MOV, (outs GPR:$dst), (ins GPR: 
> $src0),
>     “mov $dst, $src0”,    [(set GPR:$dst, (fneg GPR:$src0))]>;
>
> I want to place a modifier directly after $src0 in the string so  
> that no space is between the string
> and the matched register. I.e. I want to generate “mov $dst,  
> $src0_neg”, however, by putting the
> _neg right after $src0 forces it to attempt to match against  
> src0_neg instead of just src0. Where
> can I find the rules for the string pattern matcher so that I can  
> added arbitrary strings into my
> definition.
Try using ${src0}_neg

-Chris
>
> Thanks,
>
>
> Micah Villmow
> Systems Engineer
> Advanced Technology & Performance
> Advanced Micro Devices Inc.
> 4555 Great America Pkwy,
> Santa Clara, CA. 95054
> P: 408-572-6219
> F: 408-572-6596
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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