[LLVMdev] [RFC] AArch64: Should we disable GlobalMerge? (original) (raw)

Jim Grosbach grosbach at apple.com
Fri Feb 27 15:06:01 PST 2015

On Feb 27, 2015, at 2:15 PM, Ahmed Bougacha <ahmed.bougacha at gmail.com> wrote:

On Fri, Feb 27, 2015 at 2:01 PM, Renato Golin <renato.golin at linaro.org> wrote: On 27 February 2015 at 21:26, Ahmed Bougacha <ahmed.bougacha at gmail.com> wrote:

Which brings us to my fallback proposal: what about disabling the pass on darwin only?

That's a decision for Jim/Evan. I'm ok if they are. Jim, thoughts?

I would prefer Darwin not differ in this regard, but I don’t feel incredibly strongly about it. Just a general preference to keeping platform dependencies and differences to a minimum. Whatever y’all decide is fine with me.

As for other targets, as a first step, making the pass run under -O3 rather than -O1 is hopefully agreeable to everyone? Sounds reasonable. Great! Even though it conflicts with LTO, that's what O3 means, as you said, instability. People at O3 might want to fiddle with the passes (on/off) to get the best performance for their own code/workload. By the way, I'm not convinced LTO being either -O3 or -O0 is sensible. But that's a discussion for another day =) -Ahmed cheers, --renato

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