[llvm-dev] LLVM Pass for Instructions in Function (error

[Sean Silva via llvm-dev]

On Sun, Nov 27, 2016 at 8:04 PM, Mehdi Amini via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

>
> On Nov 27, 2016, at 6:40 PM, Gurunath Kadam via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Hi Sandeep,
>
> Thanks.
>
> One question about:
>
> Value* AddrPointer = Inst->getIperand(0);
>
> So this works for LVALUE(S) i.e. in my case pointer on LHS of '='. I
> cannot find anything online about getloperand online.
>
> For reference this is the instruction:
>
> %ptrA = getelementptr float, float addrspace(1)* %A, i32 %id
>
>
> I thought if I just get the return value of the instruction then I can get
> %ptrA.
>
>
>
> %ptrA is not the return value of the instruction, it *is* the instruction
> itself.
>

http://llvm.org/docs/FAQ.html#what-api-do-i-use-to-store-a-value-to-one-of-the-virtual-registers-in-llvm-ir-s-ssa-representation

-- Sean Silva


>
> —
> Mehdi
>
>
>
>
> Can you please elaborate on that?
>
> Thanks again.
>
> -Gurunath
>
> On Sun, Nov 27, 2016 at 9:21 PM, Dasgupta, Sandeep <sdasgup3 at illinois.edu>
> wrote:
>
>> Hi,
>>
>>
>>
>>
>> Sent via the Samsung Galaxy Note® 3, an AT&T 4G LTE smartphone
>>
>>
>> -------- Original message --------
>> From: Gurunath Kadam via llvm-dev <llvm-dev at lists.llvm.org>
>> Date: 11/27/2016 7:49 PM (GMT-06:00)
>> To: llvm-dev at lists.llvm.org
>> Subject: [llvm-dev] LLVM Pass for Instructions in Function (error
>>
>> Hi,
>>
>> Please find the embedded code. Also you may follow
>> http://llvm.org/docs/ProgrammersManual.html#iterating-over-
>> the-instruction-in-a-function
>> -
>> Sandeep
>>
>> I have following lines in my code, where I need to iterate over the
>> instructions in the function (not BB):
>>
>>   for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I){
>>     Instruction *Inst = I;
>>
>> Instruction *Inst = &*I;
>>   if (Inst -> getOpcode() == Instruction::GetElementPtr){
>>       Value* AddrPointer = Inst->getIperand(0);
>>        ....
>>
>>     if (cast<Operator>(Inst) -> getOpcode() ==
>> Instruction::GetElementPtr){
>>       Value* AddrPointer = cast<Value>(Inst);
>>       Value* threadId = Inst -> getOperand(1);
>>       unsigned AddrSpace = Inst -> getAddressSpace()
>>       DataStructureForTrace.push_back (std:make_tuple(new
>> Value(threadId), AddrSpace, 0, new Value(AddrPointer)));
>>     }
>>   }
>>
>> I get following error (there are more, some visible here and some not.
>> for eg, getAddressSpace not being for Instruction class.):
>>
>> error: cannot convert ‘llvm::inst_iterator {aka
>> llvm::InstIterator<llvm::SymbolTableList<llvm::BasicBlock>,
>> llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::BasicBlock,
>> false, false, void>, false, false>, llvm::ilist_iterator<llvm::ili
>> st_detail::node_options<llvm::Instruction, false, false, void>, false,
>> false>, llvm::Instruction>}’ to ‘llvm::Instruction*’ in initialization
>>      Instruction *Inst = I;
>>
>> I am not sure about this, as I am following some online code practices.
>>
>> Thank you.
>>
>> Regards,
>> Gurunath
>>
>
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