[PATCH] D14148: [GlobalOpt] Demote globals to locals more aggressively

[James Molloy via llvm-commits]

Hi,
On 16 Nov 2015, at 15:49, Mehdi Amini <mehdi.amini at apple.com<mailto:mehdi.amini at apple.com>> wrote:

So there will be cases where we will regress in the optimization for “main()”, when we can’t prove that the pointer is dead on entry. I don’t think it really matters that much in practice though, but it may look bad on some benchmarks.

That is true.

We could bake in some knowledge about main again for this? Now that main can be marked norecurse it’s slightly less of a massive bug to hardcode “main is only called once”, although it’d be a pity to reintroduce that layering violation again!

James

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