[LLVMdev] how to use "new instruction()"

[zhi chen]

Yes. I was using this. It seems the produced instruction is not correct.
There are probably some other problems. I need to recheck it. Thanks for
your help, Daniel.

Best,
Zhi

On Thu, Apr 16, 2015 at 11:40 PM, Daniel Berlin <dberlin at dberlin.org> wrote:

> Value * is the instruction.
>
> use dyn_cast<Instruction> to get to it.
>
>
> On Thu, Apr 16, 2015 at 11:39 PM zhi chen <zchenhn at gmail.com> wrote:
>
>> But IRBuilder.CreateXYZ only returns a "VALUE" type. Can I get the
>> instruction created by it? For example,
>>
>> IRBuilder<> builder(&*pinst);
>> Value *val = builder.CreateFAdd(LV, RV, "");
>>
>> How can I get the fadd instruction created by builder?
>>
>> On Thu, Apr 16, 2015 at 8:52 PM, zhi chen <zchenhn at gmail.com> wrote:
>>
>>> Yes. That's what I was the solution in my mind. But I just wanted to
>>> know if there was a generic way to save some code...
>>>
>>> On Thu, Apr 16, 2015 at 8:32 PM, Tim Northover <t.p.northover at gmail.com>
>>> wrote:
>>>
>>>> > I understand that I can detect the operation first, and use "create"
>>>> to
>>>> > create for each of them. But I don't if there is a generic way to do
>>>> this
>>>> > because if might be add/sub/mul... operations.
>>>>
>>>> I don't think there is. Realistically, just blindly replacing
>>>> instructions with vector equivalents is only going to work in a few
>>>> cases anyway. You're probably best to intentionally detect those cases
>>>> and call the correct CreateXYZ function.
>>>>
>>>> Cheers.
>>>>
>>>> Tim.
>>>>
>>>
>>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150416/18c8dc57/attachment.html>