[llvm-dev] Back tracing Variables

[don hinton via llvm-dev]

Hi Juan:

I haven't looked at SlotTracker, but have been
using MemoryDependenceWrapperPass to do something similar.

hth...
don

On Fri, Dec 23, 2016 at 5:55 AM, Juan Ceasar via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Good Morning - Happy Holidays everyone!
>
> I had a question about the best way to do back tracing of variables via
> the IR.  So for example, if I have the following simple IR:
>
> define i32 @squak(i32 %num) #0 {
>   %1 = alloca i32, align 4
>   store i32 %num, i32* %1, align 4
>   %2 = load i32, i32* %1, align 4
>   %3 = icmp sgt i32 %2, 10
>
> I’m grabbing the predicate of “icmp”, which in this case is a simple test
> “>”  of the input “%num" and the constant “10" and I want to trace back to
> “%num" via the slots/virtual registers %2 and %1.  I believe I can do this
> via the SlotTracker (in AsmWriter.cpp) but I wonder if there’s a better,
> more direct way?  Any suggestions?  I’m basically trying to track predicate
> formation in the IR and hence the need…
>
> Thanks for any help!
>
>
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