llvm dev - Apr 2015 - [LLVMdev] what's meaning of the last field of an LLVM intrinsic instrucation

The intrinsic instructions always have an number in the end, what's meaning
of it?

For example,   %2 = call <2 x double> @llvm.x86.sse2.sqrt.pd(<2 x
double>
%1) #2

What does this #2 mean? Can I ignore it when I create the instruction?
Thanks.

Best,
Zhi
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The #2 refers to a set of attributes.  Attribute sets are given unique numbers. 
You should see them listed in the IR, somewhere after the functions.
I believe attributes are attached after the instruction is created.  They
generally apply to functions (and calls), and not to most instructions.
--paulr

From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of zhi chen
Sent: Monday, April 20, 2015 10:57 PM
To: LLVM Dev
Subject: [LLVMdev] what's meaning of the last field of an LLVM intrinsic
instrucation

The intrinsic instructions always have an number in the end, what's meaning
of it?

For example,   %2 = call <2 x double> @llvm.x86.sse2.sqrt.pd(<2 x
double> %1) #2

What does this #2 mean? Can I ignore it when I create the instruction? Thanks.

Best,
Zhi
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Hi Paul,

Is this field mandatory? or do I have to create the attribute if I create a
call for the intrinsic function?

Thanks,
Zhi

On Mon, Apr 20, 2015 at 11:21 PM, Robinson, Paul <
Paul_Robinson at playstation.sony.com> wrote:
>  The #2 refers to a set of attributes.  Attribute sets are given unique
> numbers.  You should see them listed in the IR, somewhere after the
> functions.
>
> I believe attributes are attached after the instruction is created.  They
> generally apply to functions (and calls), and not to most instructions.
>
> --paulr
>
>
>
> *From:* llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu] *On
> Behalf Of *zhi chen
> *Sent:* Monday, April 20, 2015 10:57 PM
> *To:* LLVM Dev
> *Subject:* [LLVMdev] what's meaning of the last field of an LLVM
> intrinsic instrucation
>
>
>
> The intrinsic instructions always have an number in the end, what's
> meaning of it?
>
>
>
> For example,   %2 = call <2 x double> @llvm.x86.sse2.sqrt.pd(<2 x
double>
> %1) #2
>
>
>
> What does this #2 mean? Can I ignore it when I create the instruction?
> Thanks.
>
>
>
> Best,
>
> Zhi
>
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