[llvm-dev] Tablegen definition question

[James Molloy via llvm-dev]

Hi,

That's what the DecoderMethod is for. Similarly ParserMatchClass for the
asm parser and PrintMethod for the asm printer:

def CondCodeOperand : AsmOperandClass { let Name = "CondCode"; }
def pred : PredicateOperand<OtherVT, (ops i32imm, i32imm),
                                     (ops (i32 14), (i32 zero_reg))> {
  let PrintMethod = "printPredicateOperand";
  let ParserMatchClass = CondCodeOperand;
  let DecoderMethod = "DecodePredicateOperand";
}

James

On Mon, 14 Dec 2015 at 13:44 Sky Flyer <skylake007 at googlemail.com> wrote:

> But one question!
>
> imagine I define *cond* as a type of Xpred (Xpred:$cond)
> and in the instruction, for instance *bits<6> cond*.
> How can I assign the first i32imm to the 4 MSB of cond and the second
> i32imm to the 2 LSB? :-/
>
> Now:
>
> Xpred:$cond
> bits<6> cond;
> Inst{5-0} = cond;
>
> Desired:
>
> Xpred:$cond;
> bits<6> cond;
> Inst{5-2} = cond.ops[0];
> Inst{1-0} = cond.ops[1];
>
>
>
> On Mon, Dec 14, 2015 at 12:24 PM, Sky Flyer <skylake007 at googlemail.com>
> wrote:
>
>> Hello James,
>>
>> that was also what I've planned to do but just wasn't sure. Thanks for
>> that.
>>
>>
>> On Mon, Dec 14, 2015 at 11:52 AM, James Molloy <james at jamesmolloy.co.uk>
>> wrote:
>>
>>> Hi,
>>>
>>> You can't nest operands like that - it must be a flattened list. So:
>>>
>>> def *Xpred* : PredicateOperand<OtherVT, (ops *i32imm, i32imm*, i32imm),
>>> (ops (i32 14), (i32 zero_reg))> {...}
>>>
>>> On Mon, 14 Dec 2015 at 10:21 Sky Flyer via llvm-dev <
>>> llvm-dev at lists.llvm.org> wrote:
>>>
>>>> Hi All,
>>>>
>>>> In ARMInstFormats.td predicate is defined this way:
>>>>
>>>>
>>>>
>>>> *def pred : PredicateOperand<OtherVT, (ops i32imm, i32imm),*
>>>> *(ops (i32 14), (i32 zero_reg))> {...}*
>>>>
>>>>
>>>> I use the same definition in my code. But I have another version of
>>>> predicate which is exactly the same but it is a condition code plus a
>>>> quantifier! (e.g. Xpred = (pred + i32imm)).
>>>>
>>>> I was wondering how we can define a sub sub operand, something like
>>>> this:
>>>>
>>>> def *Xpred* : PredicateOperand<OtherVT, (ops *pred*, i32imm),
>>>> (ops (i32 14), (i32 zero_reg))> {...}
>>>>
>>>> I don't know how clear I explained, but can someone recommend a
>>>> solution?
>>>>
>>>> Cheers,
>>>> ES
>>>>
>>>>
>>>> _______________________________________________
>>>> LLVM Developers mailing list
>>>> llvm-dev at lists.llvm.org
>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>>>
>>>
>>
>
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