[LLVMdev] store addrspace qualifier

[Daniel M Gessel]

Micah,

I'm working on more or less the same problem.

I'm exploring the following:

const Type* dstType = storeOp->getSrcValue()->getType();

New to this myself, but I think getSrcValue() (in MemSDNode, a base  
for StoreSDNode) returns a Value object which refers back to the  
original IR, where there's more detailed type info.

I see cases where the MemSDNode will get a NULL SrcValue (I see it in  
getStore/getLoad calls in LegalizeDAG.cpp), but these all seem to be  
referring to the stack.

So, I'm thinking:

const Value* v = storeOp->getSrcValue();
if( !v )
{
	addressSpace = stackAddressSpace;
}
else
{
	const Type* dstType = storeOp->getSrcValue()->getType();
...
}

Dan



On Sep 18, 2008, at 11:42 AM, Villmow, Micah wrote:

> Mon Ping,
>  Thanks for the tip, but I can’t for the life of me seem to get the  
> Value from a StoreSDNode. From looking at the SelectionDAGNodes  
> header file, the only class that has the getValue function call is  
> SrcValueSDNode that returns a Value type. The only class that has  
> getType is a ConstantPoolSDNode. I don’t think that  
> ConstantPoolSDNode is what I want and when I try to cast the  
> getBasePtr().Val of the StoreSDNode to a SrcValueSDNode it asserts on:
> Assertion failed: isa<X>(Val) && "cast<Ty>() argument of  
> incompatible type!"
>
> This is what I’m attempting:
> SDValue LangTargetLowering::LowerSTORE(SDValue Op, SelectionDAG& DAG){
>     const StoreSDNode* storeOp = dyn_cast<StoreSDNode>(Op.Val);
>     const SDValue& dstPtr    = storeOp->getBasePtr();
>     const SrcValueSDNode* svdstVal = cast<SrcValueSDNode>(dstPtr.Val);
>     const Value* dstVal = svdstVal->getValue();
>     int addressSpace = ADDRESS_NONE;
>     const Type* dstType = dstVal->getType();
>     if (isa<PointerType>(dstType)) {
>         const PointerType* ptrType = cast<PointerType>(dstType);
>         addressSpace = ptrType->getAddressSpace();
>     }
>     printf("Addr: %d\n", addressSpace);
>  SDValue Res;
>   ….
>   return Res;
> }
>
> Any idea what I’m doing wrong or how I can get this to work correctly?
>
> Thanks,
> Micah
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev- 
> bounces at cs.uiuc.edu] On Behalf Of Mon Ping Wang
> Sent: Wednesday, September 17, 2008 3:45 PM
> To: LLVM Developers Mailing List
> Subject: Re: [LLVMdev] store addrspace qualifier
>
>
> The address qualifier is stored in the type of %result.  From that  
> operand, you can get the Value and then call getType.  The type for  
> result  should be a PointerType which you cast to a PointerType and  
> get the getAddressSpace e.g. cast<PointerType>(Ty)->getAddressSpace()
>
> -- Mon Ping
>
>
> On Sep 17, 2008, at 1:06 PM, Villmow, Micah wrote:
>
>
> How do I access the address qualifier from the store instruction.
> Given the following code:
>
> define void @test_unary_op_anegate(float %x, float addrspace(11)*  
> %result) nounwind  {
> entry:
>         %neg = sub float -0.000000e+000, %x             ; <float>  
> [#uses=1]
>         store float %neg, float addrspace(11)* %result
>         ret void
> }
> When I attempt to generate this code, I’m aborting on.
> Cannot yet select: 017E8230: ch = store 017E7DF0, 017E8098,  
> 017E8010, 017E81A8 <0035A078:0> alignment=4
> So I am doing a custom Store function.
> In my LowerStore function, I get an SDValue w/ opcode of 119(store)  
> and 4 child Operands
> Operand 0 is the entry token which I assume I can ignore
> Operand 1 is the source data(%neg), which I finally can handle  
> correctly thanks to Eli
> Operand 2 is the dst location with two children, an EntryToken and  
> Register(%result I’m guessing)
> Operand 3 is undef
>
> So, how do I find out the address space? The reason being different  
> address spaces are accessed with different registers.
>
> 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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