llvm dev - Nov 2012 - [LLVMdev] how to stop intrinsic being deleted

Hi,

So, I have inserted some calls to my intrinsic functions in a pass but there
are being removed. The purpose of the intrinsics are to increment a specific
register, the intrinsic call is lowered to a node that i have defined with
SDNPSideEffect and the instruction also is defined as 'hasSideEffects =
1'.
I have defined the instruction to return a i32 but take no arguments. Is
there any way to stop my instruction being deleted or do I need to define my
intrinsic as taking a register as an argument? And if this is the case, how
do I define a target specific register as an argument to the call?

Thanks,

Sam



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Hi Sam,
> So, I have inserted some calls to my intrinsic functions in a pass but
there
> are being removed.
is it being deleted by the IR level optimizers or during code generation?
Are you inserting it at IR level or during code generation?

Ciao, Duncan.

  The purpose of the intrinsics are to increment a
specific
> register, the intrinsic call is lowered to a node that i have defined with
> SDNPSideEffect and the instruction also is defined as 'hasSideEffects =
1'.
> I have defined the instruction to return a i32 but take no arguments. Is
> there any way to stop my instruction being deleted or do I need to define
my
> intrinsic as taking a register as an argument? And if this is the case, how
> do I define a target specific register as an argument to the call?
>
> Thanks,
>
> Sam
>
>
>
> --
> View this message in context:
http://llvm.1065342.n5.nabble.com/how-to-stop-intrinsic-being-deleted-tp51923.html
> Sent from the LLVM - Dev mailing list archive at Nabble.com.
> _______________________________________________
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>

Hi Duncan,

I'm inserting it at the IR level. I know it gets to my ISelLowering class
because I've had to modify my INTRINSIC_W_CHAIN function to fix crashes as
well as handling the chain value so that the instruction can be selected.

Cheers,
Sam

On 29 Nov 2012, at 10:42, Duncan Sands <baldrick at free.fr>
 wrote:
> Hi Sam,
> 
>> So, I have inserted some calls to my intrinsic functions in a pass but
there
>> are being removed.
> 
> is it being deleted by the IR level optimizers or during code generation?
> Are you inserting it at IR level or during code generation?
> 
> Ciao, Duncan.
> 
> The purpose of the intrinsics are to increment a specific
>> register, the intrinsic call is lowered to a node that i have defined
with
>> SDNPSideEffect and the instruction also is defined as
'hasSideEffects = 1'.
>> I have defined the instruction to return a i32 but take no arguments.
Is
>> there any way to stop my instruction being deleted or do I need to
define my
>> intrinsic as taking a register as an argument? And if this is the case,
how
>> do I define a target specific register as an argument to the call?
>> 
>> Thanks,
>> 
>> Sam
>> 
>> 
>> 
>> --
>> View this message in context:
http://llvm.1065342.n5.nabble.com/how-to-stop-intrinsic-being-deleted-tp51923.html
>> Sent from the LLVM - Dev mailing list archive at Nabble.com.
>> _______________________________________________
>> 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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