On Jul 6, 2011, at 5:44 AM, Chandler Carruth wrote:

> Hello,
> 
> Here are cleaned up and hopefully close to (or completely) ready for commit 
> patches to address PR10183.
> 
> The first patch is the big one, and it wires up stats for the analysis parts 
> of the compile. It's pretty minimal for now, and just covers the stuff that 
> was obvious and that I needed to dig into the problem with -Wuninitialized in 
> this PR. The second patch is then the actual fix to the PR. The fix is 
> essentially just swapping a stack for a queue to move from depth-first to 
> breadth-first. I've tried to make the enqueue relatively efficient, but its 
> not as efficient as the stack. We could tune this by using a proper queue 
> datastructure, but it already is a huge win.
> 
> Comments welcome. I've attached the patch files and uploaded the patches to 
> the codereview app:
> http://codereview.appspot.com/4631089/
> http://codereview.appspot.com/4673046/
> 
> I'm still running some more numbers, but the results look fairly good for 
> other inputs as well. I'm benchmarking compile times for gcc.c and for a 
> selection of inputs from Clang and LLVM's codebase.

Statistics patch looks great. The second patch (DFS -> BFS) change is something 
I don't have a good handle on.

        - Doug

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