[llvm-dev] PHI incoming blocks order

[Friedman, Eli via llvm-dev]

On 8/14/2017 3:58 AM, Anastasiya Ruzhanskaya via llvm-dev wrote:
> Hello,
> Is it a convenient way except of somehow iterating from one block to 
> another to find from which block I have initial incoming value and 
> from which I have a changing incoming value (this is only for phi 
> nodes with two incoming blocks)? Dominator tree requires to know one 
> block and one block edge...this is not what I want. Is it valid to 
> take two first instructions from two incoming blocks and see what 
> dominates what?

You can use Loop::contains() to figure out whether a basic block is 
inside a loop.  I think that's what you're looking for?

-Eli

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