[LLVMdev] Should repetitive basic blocks be removed in the results of LoopBase::getExitBlocks()?

[Andrew Trick]

On Apr 19, 2012, at 10:43 PM, xiaoming gu <xiaoming.gu at gmail.com> wrote:

> Hi, all. I'm using void LoopBase::getExitBlocks (SmallVectorImpl< BlockT * > &ExitBlocks) const to get all 
> exit blocks for a loop. The problem I find with this API is that it returns repetitive basic blocks in certain 
> situations. Should repetitive basic blocks be removed?

Users generally expect a unique set of exit blocks, but don't make any strong assumption. The worst that can happen is missed optimization or redundant analysis. In most cases, the loop is in LoopSimplifyForm, so it's probably not a problem in practice.

-Andy

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