llvm dev - Dec 2018 - New to LLVM. Need help generating assembly

Hi,
I'm new to LLVM and need some help. I defined an instruction to increment
the stack pointer by 'amount' (i.e. sp = sp + amount). During assembly
generation, the string that gets emitted is "ADS $SP"  rather than
"ADS 10", for example, if I want to increment it by 10.

Can somebody show me what I'm doing wrong?
Thanks.

def ADS: F_J<0b100001,(outs),(ins i32imm:$amount),"ADS
$amount",[(set SP, (add SP, i32imm:$amount))] > {

        bits<10> amount;

        let Inst{9-0} = amount;
        let isReMaterializable = 1;
        let mayLoad = 0;
        let mayStore = 0;
        let Defs = [SP];
        let Uses = [SP];
}
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On 12/05/2018 07:22 PM, m m via llvm-dev wrote:
> Hi,
> I'm new to LLVM and need some help. I defined an instruction to
increment the stack pointer by 'amount' (i.e. sp = sp + amount). During
assembly generation, the string that gets emitted is "ADS $SP"  rather
than "ADS 10", for example, if I want to increment it by 10.
> 
> Can somebody show me what I'm doing wrong?
> Thanks.
> 
> def ADS: F_J<0b100001,(outs),(ins i32imm:$amount),"ADS
$amount",[(set SP, (add SP, i32imm:$amount))] > {
> 
>         bits<10> amount;
> 
>         let Inst{9-0} = amount;
>         let isReMaterializable = 1;
>         let mayLoad = 0;
>         let mayStore = 0;
>         let Defs = [SP];
>         let Uses = [SP];
> }
What does the MCInst dump of this instruction look like?  Have you looked
at YourTargetGenAsmWriter.inc to see which print methods are being called
for this instruction?

-Tom
> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>

> On Dec 5, 2018, at 22:15, Tom Stellard via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> On 12/05/2018 07:22 PM, m m via llvm-dev wrote:
>> Hi,
>> I'm new to LLVM and need some help. I defined an instruction to
increment the stack pointer by 'amount' (i.e. sp = sp + amount). During
assembly generation, the string that gets emitted is "ADS $SP"  rather
than "ADS 10", for example, if I want to increment it by 10.
>> 
>> Can somebody show me what I'm doing wrong?
>> Thanks.
>> 
>> def ADS: F_J<0b100001,(outs),(ins i32imm:$amount),"ADS
$amount",[(set SP, (add SP, i32imm:$amount))] > {
>> 
>>        bits<10> amount;
>> 
>>        let Inst{9-0} = amount;
>>        let isReMaterializable = 1;
>>        let mayLoad = 0;
>>        let mayStore = 0;
>>        let Defs = [SP];
>>        let Uses = [SP];
>> }
> 
> What does the MCInst dump of this instruction look like?  Have you looked
> at YourTargetGenAsmWriter.inc to see which print methods are being called
> for this instruction?
> 
> -Tom
It's also worth checking the output of the compiler with the
-print-after-all option to see if your instruction is present in the last IR
dump. It's possible that another instruction is being selected instead of
this one.
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
<http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
>> 
> 
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
<http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev>
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