[llvm] r185040 - SLP: Dont erase instructions during vectorization because it prevents the outerloops from iterating over the instructions.

[Nadav Rotem]

On Jun 26, 2013, at 4:55 PM, Chandler Carruth <chandlerc at google.com> wrote:

> It may not be worth it, but I found in SROA it was much more efficient to keep a local vector of dead instructions that I manually went and deleted at the end of the pass. That way you don't have iterator invalidation concerns, but you also don't re-do the work to prove them dead.

That’s what I do with the code that does local CSE. I will probably go back and add the vector of deleted instructions for this as well.  
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