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On 26 February 2015 at 00:57, Ahmed Bougacha <ahmed.bougacha at gmail.com> wrote: > -- A way forward > One obvious way to improve it is: look at uses of globals, and try to > form sets of globals commonly used together. The tricky part is to > define heuristics for "commonly". Also, the pass then becomes much > more expensive. I'm currently looking into

Hi all, I've started looking at the GlobalMerge pass, enabled by default on ARM and AArch64. I think we should reconsider that, at least for AArch64. As is, the pass just merges all globals together, in groups of 4KB (AArch64, 128B on ARM). At the time it was enabled, the general thinking was "it's almost free, it doesn't affect performance much, we might as well use it".